Class: Redis

Inherits:
Object
  • Object
show all
Includes:
MonitorMixin
Defined in:
lib/redis.rb,
lib/redis/client.rb,
lib/redis/errors.rb,
lib/redis/version.rb,
lib/redis/pipeline.rb,
lib/redis/hash_ring.rb,
lib/redis/subscribe.rb,
lib/redis/distributed.rb

Defined Under Namespace

Classes: BaseConnectionError, BaseError, BasicObject, CannotConnectError, Client, CommandError, ConnectionError, Distributed, Future, FutureNotReady, HashRing, InheritedError, Pipeline, ProtocolError, SubscribedClient, Subscription, TimeoutError

Constant Summary collapse

VERSION = 
"3.1.0"

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Redis

Returns a new instance of Redis.



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# File 'lib/redis.rb', line 29

def initialize(options = {})
  @options = options.dup
  @original_client = @client = Client.new(options)

  super() # Monitor#initialize
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(command, *args) ⇒ Object 



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# File 'lib/redis.rb', line 2484

def method_missing(command, *args)
  synchronize do |client|
    client.call([command] + args)
  end
end

Instance Attribute Details

#client ⇒ Object (readonly)

Returns the value of attribute client.



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# File 'lib/redis.rb', line 10

def client
  @client
end

Class Method Details

.connect(options = {}) ⇒ Object

Deprecated.

The preferred way to create a new client object is using #new. This method does not actually establish a connection to Redis, in contrary to what you might expect.



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# File 'lib/redis.rb', line 15

def self.connect(options = {})
  new(options)
end

.current ⇒ Object 



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# File 'lib/redis.rb', line 19

def self.current
  @current ||= Redis.new
end

.current=(redis) ⇒ Object 



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# File 'lib/redis.rb', line 23

def self.current=(redis)
  @current = redis
end

.deprecate(message, trace = caller[0]) ⇒ Object 



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# File 'lib/redis.rb', line 6

def self.deprecate(message, trace = caller[0])
  $stderr.puts "\n#{message} (in #{trace})"
end

Instance Method Details

#_bpop(cmd, args) ⇒ Object 



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# File 'lib/redis.rb', line 1038

def _bpop(cmd, args)
  options = {}

  case args.last
  when Hash
    options = args.pop
  when Integer
    # Issue deprecation notice in obnoxious mode...
    options[:timeout] = args.pop
  end

  if args.size > 1
    # Issue deprecation notice in obnoxious mode...
  end

  keys = args.flatten
  timeout = options[:timeout] || 0

  synchronize do |client|
    command = [cmd, keys, timeout]
    timeout += client.timeout if timeout > 0
    client.call_with_timeout(command, timeout)
  end
end

#_eval(cmd, args) ⇒ Object 



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# File 'lib/redis.rb', line 2201

def _eval(cmd, args)
  script = args.shift
  options = args.pop if args.last.is_a?(Hash)
  options ||= {}

  keys = args.shift || options[:keys] || []
  argv = args.shift || options[:argv] || []

  synchronize do |client|
    client.call([cmd, script, keys.length] + keys + argv)
  end
end

#_scan(command, cursor, args, options = {}, &block) ⇒ Object 



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# File 'lib/redis.rb', line 2264

def _scan(command, cursor, args, options = {}, &block)
  # SSCAN/ZSCAN/HSCAN already prepend the key to +args+.

  args << cursor

  if match = options[:match]
    args.concat(["MATCH", match])
  end

  if count = options[:count]
    args.concat(["COUNT", count])
  end

  synchronize do |client|
    client.call([command] + args, &block)
  end
end

#append(key, value) ⇒ Fixnum

Append a value to a key.

Parameters:

  • key (String)
  • value (String) —

    value to append

Returns:

  • (Fixnum) —

    length of the string after appending



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# File 'lib/redis.rb', line 879

def append(key, value)
  synchronize do |client|
    client.call([:append, key, value])
  end
end

#auth(password) ⇒ String

Authenticate to the server.

Parameters:

  • password (String) —

    must match the password specified in the requirepass directive in the configuration file

Returns:

  • (String) —

    OK



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# File 'lib/redis.rb', line 62

def auth(password)
  synchronize do |client|
    client.call([:auth, password])
  end
end

#bgrewriteaof ⇒ String

Asynchronously rewrite the append-only file.

Returns:

  • (String) —

    OK



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# File 'lib/redis.rb', line 115

def bgrewriteaof
  synchronize do |client|
    client.call([:bgrewriteaof])
  end
end

#bgsave ⇒ String

Asynchronously save the dataset to disk.

Returns:

  • (String) —

    OK



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# File 'lib/redis.rb', line 124

def bgsave
  synchronize do |client|
    client.call([:bgsave])
  end
end

#bitcount(key, start = 0, stop = -1)) ⇒ Fixnum

Count the number of set bits in a range of the string value stored at key.

Parameters:

  • key (String)
  • start (Fixnum) (defaults to: 0) —

    start index

  • stop (Fixnum) (defaults to: -1)) —

    stop index

Returns:

  • (Fixnum) —

    the number of bits set to 1



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# File 'lib/redis.rb', line 891

def bitcount(key, start = 0, stop = -1)
  synchronize do |client|
    client.call([:bitcount, key, start, stop])
  end
end

#bitop(operation, destkey, *keys) ⇒ Fixnum

Perform a bitwise operation between strings and store the resulting string in a key.

Parameters:

  • operation (String) —

    e.g. and, or, xor, not

  • destkey (String) —

    destination key

  • keys (String, Array<String>) —

    one or more source keys to perform operation

Returns:

  • (Fixnum) —

    the length of the string stored in destkey



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# File 'lib/redis.rb', line 903

def bitop(operation, destkey, *keys)
  synchronize do |client|
    client.call([:bitop, operation, destkey] + keys)
  end
end

#bitpos(key, bit, start = nil, stop = nil) ⇒ Fixnum

Return the position of the first bit set to 1 or 0 in a string.

Parameters:

  • key (String)
  • bit (Fixnum) —

    whether to look for the first 1 or 0 bit

  • start (Fixnum) (defaults to: nil) —

    start index

  • stop (Fixnum) (defaults to: nil) —

    stop index

Returns:

  • (Fixnum) —

    the position of the first 1/0 bit. -1 if looking for 1 and it is not found or start and stop are given.



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# File 'lib/redis.rb', line 917

def bitpos(key, bit, start=nil, stop=nil)
  if stop and not start
    raise(ArgumentError, 'stop parameter specified without start parameter')
  end

  synchronize do |client|
    command = [:bitpos, key, bit]
    command << start if start
    command << stop if stop
    client.call(command)
  end
end

#blpop(*args) ⇒ nil, [String, String]

Remove and get the first element in a list, or block until one is available.

Examples:

With timeout

list, element = redis.blpop("list", :timeout => 5)
  # => nil on timeout
  # => ["list", "element"] on success

Without timeout

list, element = redis.blpop("list")
  # => ["list", "element"]

Blocking pop on multiple lists

list, element = redis.blpop(["list", "another_list"])
  # => ["list", "element"]

Parameters:

  • keys (String, Array<String>) —

    one or more keys to perform the blocking pop on

  • options (Hash) —
    • :timeout => Fixnum: timeout in seconds, defaults to no timeout

Returns:

  • (nil, [String, String]) —
    • nil when the operation timed out
    • tuple of the list that was popped from and element was popped otherwise


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# File 'lib/redis.rb', line 1084

def blpop(*args)
  _bpop(:blpop, args)
end

#brpop(*args) ⇒ nil, [String, String]

Remove and get the last element in a list, or block until one is available.

Parameters:

  • keys (String, Array<String>) —

    one or more keys to perform the blocking pop on

  • options (Hash) —
    • :timeout => Fixnum: timeout in seconds, defaults to no timeout

Returns:

  • (nil, [String, String]) —
    • nil when the operation timed out
    • tuple of the list that was popped from and element was popped otherwise

See Also:



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# File 'lib/redis.rb', line 1100

def brpop(*args)
  _bpop(:brpop, args)
end

#brpoplpush(source, destination, options = {}) ⇒ nil, String

Pop a value from a list, push it to another list and return it; or block until one is available.

Parameters:

  • source (String) —

    source key

  • destination (String) —

    destination key

  • options (Hash) (defaults to: {}) —
    • :timeout => Fixnum: timeout in seconds, defaults to no timeout

Returns:

  • (nil, String) —
    • nil when the operation timed out
    • the element was popped and pushed otherwise


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# File 'lib/redis.rb', line 1115

def brpoplpush(source, destination, options = {})
  case options
  when Integer
    # Issue deprecation notice in obnoxious mode...
    options = { :timeout => options }
  end

  timeout = options[:timeout] || 0

  synchronize do |client|
    command = [:brpoplpush, source, destination, timeout]
    timeout += client.timeout if timeout > 0
    client.call_with_timeout(command, timeout)
  end
end

#config(action, *args) ⇒ String, Hash

Get or set server configuration parameters.

Parameters:

  • action (Symbol) —

    e.g. :get, :set, :resetstat

Returns:

  • (String, Hash) —

    string reply, or hash when retrieving more than one property with CONFIG GET



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# File 'lib/redis.rb', line 135

def config(action, *args)
  synchronize do |client|
    client.call([:config, action] + args) do |reply|
      if reply.kind_of?(Array) && action == :get
        Hash[_pairify(reply)]
      else
        reply
      end
    end
  end
end

#connected? ⇒ Boolean

Test whether or not the client is connected

Returns:

  • (Boolean) 


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# File 'lib/redis.rb', line 53

def connected?
  @original_client.connected?
end

#dbsize ⇒ Fixnum

Return the number of keys in the selected database.

Returns:

  • (Fixnum) 


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# File 'lib/redis.rb', line 150

def dbsize
  synchronize do |client|
    client.call([:dbsize])
  end
end

#debug(*args) ⇒ Object 



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# File 'lib/redis.rb', line 156

def debug(*args)
  synchronize do |client|
    client.call([:debug] + args)
  end
end

#decr(key) ⇒ Fixnum

Decrement the integer value of a key by one.

Examples:

redis.decr("value")
  # => 4

Parameters:

  • key (String)

Returns:

  • (Fixnum) —

    value after decrementing it



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# File 'lib/redis.rb', line 582

def decr(key)
  synchronize do |client|
    client.call([:decr, key])
  end
end

#decrby(key, decrement) ⇒ Fixnum

Decrement the integer value of a key by the given number.

Examples:

redis.decrby("value", 5)
  # => 0

Parameters:

  • key (String)
  • decrement (Fixnum)

Returns:

  • (Fixnum) —

    value after decrementing it



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# File 'lib/redis.rb', line 597

def decrby(key, decrement)
  synchronize do |client|
    client.call([:decrby, key, decrement])
  end
end

#del(*keys) ⇒ Fixnum

Delete one or more keys.

Parameters:

  • keys (String, Array<String>)

Returns:

  • (Fixnum) —

    number of keys that were deleted



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# File 'lib/redis.rb', line 414

def del(*keys)
  synchronize do |client|
    client.call([:del] + keys)
  end
end

#discard ⇒ Object

Discard all commands issued after MULTI.

Only call this method when #multi was called without a block.

See Also:



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# File 'lib/redis.rb', line 2147

def discard
  synchronize do |client|
    client.call([:discard])
  end
end

#dump(key) ⇒ String

Return a serialized version of the value stored at a key.

Parameters:

  • key (String)

Returns:

  • (String) —

    serialized_value



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# File 'lib/redis.rb', line 372

def dump(key)
  synchronize do |client|
    client.call([:dump, key])
  end
end

#dup ⇒ Object 



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# File 'lib/redis.rb', line 2480

def dup
  self.class.new(@options)
end

#echo(value) ⇒ String

Echo the given string.

Parameters:

  • value (String)

Returns:

  • (String) 


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# File 'lib/redis.rb', line 92

def echo(value)
  synchronize do |client|
    client.call([:echo, value])
  end
end

#eval(*args) ⇒ Object

Evaluate Lua script.

Examples:

EVAL without KEYS nor ARGV

redis.eval("return 1")
  # => 1

EVAL with KEYS and ARGV as array arguments

redis.eval("return { KEYS, ARGV }", ["k1", "k2"], ["a1", "a2"])
  # => [["k1", "k2"], ["a1", "a2"]]

EVAL with KEYS and ARGV in a hash argument

redis.eval("return { KEYS, ARGV }", :keys => ["k1", "k2"], :argv => ["a1", "a2"])
  # => [["k1", "k2"], ["a1", "a2"]]

Parameters:

  • keys (Array<String>) —

    optional array with keys to pass to the script

  • argv (Array<String>) —

    optional array with arguments to pass to the script

  • options (Hash) —
    • :keys => Array<String>: optional array with keys to pass to the script
    • :argv => Array<String>: optional array with arguments to pass to the script

Returns:

  • depends on the script

See Also:



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# File 'lib/redis.rb', line 2235

def eval(*args)
  _eval(:eval, args)
end

#evalsha(*args) ⇒ Object

Evaluate Lua script by its SHA.

Examples:

EVALSHA without KEYS nor ARGV

redis.evalsha(sha)
  # => <depends on script>

EVALSHA with KEYS and ARGV as array arguments

redis.evalsha(sha, ["k1", "k2"], ["a1", "a2"])
  # => <depends on script>

EVALSHA with KEYS and ARGV in a hash argument

redis.evalsha(sha, :keys => ["k1", "k2"], :argv => ["a1", "a2"])
  # => <depends on script>

Parameters:

  • keys (Array<String>) —

    optional array with keys to pass to the script

  • argv (Array<String>) —

    optional array with arguments to pass to the script

  • options (Hash) —
    • :keys => Array<String>: optional array with keys to pass to the script
    • :argv => Array<String>: optional array with arguments to pass to the script

Returns:

  • depends on the script

See Also:



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# File 'lib/redis.rb', line 2260

def evalsha(*args)
  _eval(:evalsha, args)
end

#exec ⇒ nil, Array<...>

Execute all commands issued after MULTI.

Only call this method when #multi was called without a block.

Returns:

  • (nil, Array<...>) —
    • when commands were not executed, nil
    • when commands were executed, an array with their replies

See Also:



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# File 'lib/redis.rb', line 2133

def exec
  synchronize do |client|
    client.call([:exec])
  end
end

#exists(key) ⇒ Boolean

Determine if a key exists.

Parameters:

  • key (String)

Returns:

  • (Boolean) 


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# File 'lib/redis.rb', line 424

def exists(key)
  synchronize do |client|
    client.call([:exists, key], &_boolify)
  end
end

#expire(key, seconds) ⇒ Boolean

Set a key's time to live in seconds.

Parameters:

  • key (String)
  • seconds (Fixnum) —

    time to live

Returns:

  • (Boolean) —

    whether the timeout was set or not



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# File 'lib/redis.rb', line 307

def expire(key, seconds)
  synchronize do |client|
    client.call([:expire, key, seconds], &_boolify)
  end
end

#expireat(key, unix_time) ⇒ Boolean

Set the expiration for a key as a UNIX timestamp.

Parameters:

  • key (String)
  • unix_time (Fixnum) —

    expiry time specified as a UNIX timestamp

Returns:

  • (Boolean) —

    whether the timeout was set or not



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# File 'lib/redis.rb', line 318

def expireat(key, unix_time)
  synchronize do |client|
    client.call([:expireat, key, unix_time], &_boolify)
  end
end

#flushall ⇒ String

Remove all keys from all databases.

Returns:

  • (String) —

    OK



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# File 'lib/redis.rb', line 165

def flushall
  synchronize do |client|
    client.call([:flushall])
  end
end

#flushdb ⇒ String

Remove all keys from the current database.

Returns:

  • (String) —

    OK



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# File 'lib/redis.rb', line 174

def flushdb
  synchronize do |client|
    client.call([:flushdb])
  end
end

#get(key) ⇒ String Also known as: []

Get the value of a key.

Parameters:

  • key (String)

Returns:

  • (String) 


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# File 'lib/redis.rb', line 782

def get(key)
  synchronize do |client|
    client.call([:get, key])
  end
end

#getbit(key, offset) ⇒ Fixnum

Returns the bit value at offset in the string value stored at key.

Parameters:

  • key (String)
  • offset (Fixnum) —

    bit offset

Returns:

  • (Fixnum) —

    0 or 1



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# File 'lib/redis.rb', line 868

def getbit(key, offset)
  synchronize do |client|
    client.call([:getbit, key, offset])
  end
end

#getrange(key, start, stop) ⇒ Fixnum

Get a substring of the string stored at a key.

Parameters:

  • key (String)
  • start (Fixnum) —

    zero-based start offset

  • stop (Fixnum) —

    zero-based end offset. Use -1 for representing the end of the string

Returns:

  • (Fixnum) —

    0 or 1



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# File 'lib/redis.rb', line 845

def getrange(key, start, stop)
  synchronize do |client|
    client.call([:getrange, key, start, stop])
  end
end

#getset(key, value) ⇒ String

Set the string value of a key and return its old value.

Parameters:

  • key (String)
  • value (String) —

    value to replace the current value with

Returns:

  • (String) —

    the old value stored in the key, or nil if the key did not exist



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# File 'lib/redis.rb', line 936

def getset(key, value)
  synchronize do |client|
    client.call([:getset, key, value.to_s])
  end
end

#hdel(key, field) ⇒ Fixnum

Delete one or more hash fields.

Parameters:

  • key (String)
  • field (String, Array<String>)

Returns:

  • (Fixnum) —

    the number of fields that were removed from the hash



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# File 'lib/redis.rb', line 1889

def hdel(key, field)
  synchronize do |client|
    client.call([:hdel, key, field])
  end
end

#hexists(key, field) ⇒ Boolean

Determine if a hash field exists.

Parameters:

  • key (String)
  • field (String)

Returns:

  • (Boolean) —

    whether or not the field exists in the hash



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# File 'lib/redis.rb', line 1900

def hexists(key, field)
  synchronize do |client|
    client.call([:hexists, key, field], &_boolify)
  end
end

#hget(key, field) ⇒ String

Get the value of a hash field.

Parameters:

  • key (String)
  • field (String)

Returns:

  • (String) 


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# File 'lib/redis.rb', line 1840

def hget(key, field)
  synchronize do |client|
    client.call([:hget, key, field])
  end
end

#hgetall(key) ⇒ Hash<String, String>

Get all the fields and values in a hash.

Parameters:

  • key (String)

Returns:

  • (Hash<String, String>) 


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# File 'lib/redis.rb', line 1954

def hgetall(key)
  synchronize do |client|
    client.call([:hgetall, key], &_hashify)
  end
end

#hincrby(key, field, increment) ⇒ Fixnum

Increment the integer value of a hash field by the given integer number.

Parameters:

  • key (String)
  • field (String)
  • increment (Fixnum)

Returns:

  • (Fixnum) —

    value of the field after incrementing it



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# File 'lib/redis.rb', line 1912

def hincrby(key, field, increment)
  synchronize do |client|
    client.call([:hincrby, key, field, increment])
  end
end

#hincrbyfloat(key, field, increment) ⇒ Float

Increment the numeric value of a hash field by the given float number.

Parameters:

  • key (String)
  • field (String)
  • increment (Float)

Returns:

  • (Float) —

    value of the field after incrementing it



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# File 'lib/redis.rb', line 1924

def hincrbyfloat(key, field, increment)
  synchronize do |client|
    client.call([:hincrbyfloat, key, field, increment], &_floatify)
  end
end

#hkeys(key) ⇒ Array<String>

Get all the fields in a hash.

Parameters:

  • key (String)

Returns:

  • (Array<String>) 


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# File 'lib/redis.rb', line 1934

def hkeys(key)
  synchronize do |client|
    client.call([:hkeys, key])
  end
end

#hlen(key) ⇒ Fixnum

Get the number of fields in a hash.

Parameters:

  • key (String)

Returns:

  • (Fixnum) —

    number of fields in the hash



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# File 'lib/redis.rb', line 1773

def hlen(key)
  synchronize do |client|
    client.call([:hlen, key])
  end
end

#hmget(key, *fields, &blk) ⇒ Array<String>

Get the values of all the given hash fields.

Examples:

redis.hmget("hash", "f1", "f2")
  # => ["v1", "v2"]

Parameters:

  • key (String)
  • fields (Array<String>) —

    array of fields

Returns:

  • (Array<String>) —

    an array of values for the specified fields

See Also:



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# File 'lib/redis.rb', line 1857

def hmget(key, *fields, &blk)
  synchronize do |client|
    client.call([:hmget, key] + fields, &blk)
  end
end

#hmset(key, *attrs) ⇒ Object

Set one or more hash values.

Examples:

redis.hmset("hash", "f1", "v1", "f2", "v2")
  # => "OK"

Parameters:

  • key (String)
  • attrs (Array<String>) —

    array of fields and values

See Also:



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# File 'lib/redis.rb', line 1814

def hmset(key, *attrs)
  synchronize do |client|
    client.call([:hmset, key] + attrs)
  end
end

#hscan(key, cursor, options = {}) ⇒ String, Array<[String, String]>

Scan a hash

Examples:

Retrieve the first batch of key/value pairs in a hash

redis.hscan("hash", 0)

Parameters:

  • cursor: (String, Integer) —

    the cursor of the iteration

  • options (Hash) (defaults to: {}) —
    • :match => String: only return keys matching the pattern
    • :count => Integer: return count keys at most per iteration

Returns:

  • (String, Array<[String, String]>) —

    the next cursor and all found keys



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# File 'lib/redis.rb', line 2337

def hscan(key, cursor, options={})
  _scan(:hscan, cursor, [key], options) do |reply|
    [reply[0], _pairify(reply[1])]
  end
end

#hscan_each(key, options = {}, &block) ⇒ Enumerator

Scan a hash

Examples:

Retrieve all of the key/value pairs in a hash

redis.hscan_each("hash").to_a
# => [["key70", "70"], ["key80", "80"]]

Parameters:

  • options (Hash) (defaults to: {}) —
    • :match => String: only return keys matching the pattern
    • :count => Integer: return count keys at most per iteration

Returns:

  • (Enumerator) —

    an enumerator for all found keys



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# File 'lib/redis.rb', line 2354

def hscan_each(key, options={}, &block)
  return to_enum(:hscan_each, key, options) unless block_given?
  cursor = 0
  loop do
    cursor, values = hscan(key, cursor, options)
    values.each(&block)
    break if cursor == "0"
  end
end

#hset(key, field, value) ⇒ Boolean

Set the string value of a hash field.

Parameters:

  • key (String)
  • field (String)
  • value (String)

Returns:

  • (Boolean) —

    whether or not the field was added to the hash



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# File 'lib/redis.rb', line 1785

def hset(key, field, value)
  synchronize do |client|
    client.call([:hset, key, field, value], &_boolify)
  end
end

#hsetnx(key, field, value) ⇒ Boolean

Set the value of a hash field, only if the field does not exist.

Parameters:

  • key (String)
  • field (String)
  • value (String)

Returns:

  • (Boolean) —

    whether or not the field was added to the hash



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# File 'lib/redis.rb', line 1797

def hsetnx(key, field, value)
  synchronize do |client|
    client.call([:hsetnx, key, field, value], &_boolify)
  end
end

#hvals(key) ⇒ Array<String>

Get all the values in a hash.

Parameters:

  • key (String)

Returns:

  • (Array<String>) 


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# File 'lib/redis.rb', line 1944

def hvals(key)
  synchronize do |client|
    client.call([:hvals, key])
  end
end

#id ⇒ Object 



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# File 'lib/redis.rb', line 2472

def id
  @original_client.id
end

#incr(key) ⇒ Fixnum

Increment the integer value of a key by one.

Examples:

redis.incr("value")
  # => 6

Parameters:

  • key (String)

Returns:

  • (Fixnum) —

    value after incrementing it



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# File 'lib/redis.rb', line 611

def incr(key)
  synchronize do |client|
    client.call([:incr, key])
  end
end

#incrby(key, increment) ⇒ Fixnum

Increment the integer value of a key by the given integer number.

Examples:

redis.incrby("value", 5)
  # => 10

Parameters:

  • key (String)
  • increment (Fixnum)

Returns:

  • (Fixnum) —

    value after incrementing it



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# File 'lib/redis.rb', line 626

def incrby(key, increment)
  synchronize do |client|
    client.call([:incrby, key, increment])
  end
end

#incrbyfloat(key, increment) ⇒ Float

Increment the numeric value of a key by the given float number.

Examples:

redis.incrbyfloat("value", 1.23)
  # => 1.23

Parameters:

  • key (String)
  • increment (Float)

Returns:

  • (Float) —

    value after incrementing it



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# File 'lib/redis.rb', line 641

def incrbyfloat(key, increment)
  synchronize do |client|
    client.call([:incrbyfloat, key, increment], &_floatify)
  end
end

#info(cmd = nil) ⇒ Hash<String, String>

Get information and statistics about the server.

Parameters:

  • cmd (String, Symbol) (defaults to: nil) —

    e.g. "commandstats"

Returns:

  • (Hash<String, String>) 


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# File 'lib/redis.rb', line 184

def info(cmd = nil)
  synchronize do |client|
    client.call([:info, cmd].compact) do |reply|
      if reply.kind_of?(String)
        reply = Hash[reply.split("\r\n").map do |line|
          line.split(":", 2) unless line =~ /^(#|$)/
        end.compact]

        if cmd && cmd.to_s == "commandstats"
          # Extract nested hashes for INFO COMMANDSTATS
          reply = Hash[reply.map do |k, v|
            v = v.split(",").map { |e| e.split("=") }
            [k[/^cmdstat_(.*)$/, 1], Hash[v]]
          end]
        end
      end

      reply
    end
  end
end

#inspect ⇒ Object 



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# File 'lib/redis.rb', line 2476

def inspect
  "#<Redis client v#{Redis::VERSION} for #{id}>"
end

#keys(pattern = "*") ⇒ Array<String>

Find all keys matching the given pattern.

Parameters:

  • pattern (String) (defaults to: "*")

Returns:

  • (Array<String>) 


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# File 'lib/redis.rb', line 434

def keys(pattern = "*")
  synchronize do |client|
    client.call([:keys, pattern]) do |reply|
      if reply.kind_of?(String)
        reply.split(" ")
      else
        reply
      end
    end
  end
end

#lastsave ⇒ Fixnum

Get the UNIX time stamp of the last successful save to disk.

Returns:

  • (Fixnum) 


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# File 'lib/redis.rb', line 209

def lastsave
  synchronize do |client|
    client.call([:lastsave])
  end
end

#lindex(key, index) ⇒ String

Get an element from a list by its index.

Parameters:

  • key (String)
  • index (Fixnum)

Returns:

  • (String) 


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# File 'lib/redis.rb', line 1136

def lindex(key, index)
  synchronize do |client|
    client.call([:lindex, key, index])
  end
end

#linsert(key, where, pivot, value) ⇒ Fixnum

Insert an element before or after another element in a list.

Parameters:

  • key (String)
  • where (String, Symbol) —

    BEFORE or AFTER

  • pivot (String) —

    reference element

  • value (String)

Returns:

  • (Fixnum) —

    length of the list after the insert operation, or -1 when the element pivot was not found



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# File 'lib/redis.rb', line 1150

def linsert(key, where, pivot, value)
  synchronize do |client|
    client.call([:linsert, key, where, pivot, value])
  end
end

#llen(key) ⇒ Fixnum

Get the length of a list.

Parameters:

  • key (String)

Returns:

  • (Fixnum) 


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# File 'lib/redis.rb', line 957

def llen(key)
  synchronize do |client|
    client.call([:llen, key])
  end
end

#lpop(key) ⇒ String

Remove and get the first element in a list.

Parameters:

  • key (String)

Returns:

  • (String) 


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# File 'lib/redis.rb', line 1011

def lpop(key)
  synchronize do |client|
    client.call([:lpop, key])
  end
end

#lpush(key, value) ⇒ Fixnum

Prepend one or more values to a list, creating the list if it doesn't exist

Parameters:

  • key (String)
  • string (String, Array) —

    value, or array of string values to push

Returns:

  • (Fixnum) —

    the length of the list after the push operation



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# File 'lib/redis.rb', line 968

def lpush(key, value)
  synchronize do |client|
    client.call([:lpush, key, value])
  end
end

#lpushx(key, value) ⇒ Fixnum

Prepend a value to a list, only if the list exists.

Parameters:

  • key (String)
  • value (String)

Returns:

  • (Fixnum) —

    the length of the list after the push operation



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# File 'lib/redis.rb', line 979

def lpushx(key, value)
  synchronize do |client|
    client.call([:lpushx, key, value])
  end
end

#lrange(key, start, stop) ⇒ Array<String>

Get a range of elements from a list.

Parameters:

  • key (String)
  • start (Fixnum) —

    start index

  • stop (Fixnum) —

    stop index

Returns:

  • (Array<String>) 


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# File 'lib/redis.rb', line 1162

def lrange(key, start, stop)
  synchronize do |client|
    client.call([:lrange, key, start, stop])
  end
end

#lrem(key, count, value) ⇒ Fixnum

Remove elements from a list.

Parameters:

  • key (String)
  • count (Fixnum) —

    number of elements to remove. Use a positive value to remove the first count occurrences of value. A negative value to remove the last count occurrences of value. Or zero, to remove all occurrences of value from the list.

  • value (String)

Returns:

  • (Fixnum) —

    the number of removed elements



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# File 'lib/redis.rb', line 1177

def lrem(key, count, value)
  synchronize do |client|
    client.call([:lrem, key, count, value])
  end
end

#lset(key, index, value) ⇒ String

Set the value of an element in a list by its index.

Parameters:

  • key (String)
  • index (Fixnum)
  • value (String)

Returns:

  • (String) —

    OK



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# File 'lib/redis.rb', line 1189

def lset(key, index, value)
  synchronize do |client|
    client.call([:lset, key, index, value])
  end
end

#ltrim(key, start, stop) ⇒ String

Trim a list to the specified range.

Parameters:

  • key (String)
  • start (Fixnum) —

    start index

  • stop (Fixnum) —

    stop index

Returns:

  • (String) —

    OK



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# File 'lib/redis.rb', line 1201

def ltrim(key, start, stop)
  synchronize do |client|
    client.call([:ltrim, key, start, stop])
  end
end

#mapped_hmget(key, *fields) ⇒ Hash

Get the values of all the given hash fields.

Examples:

redis.hmget("hash", "f1", "f2")
  # => { "f1" => "v1", "f2" => "v2" }

Parameters:

  • key (String)
  • fields (Array<String>) —

    array of fields

Returns:

  • (Hash) —

    a hash mapping the specified fields to their values

See Also:



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# File 'lib/redis.rb', line 1874

def mapped_hmget(key, *fields)
  hmget(key, *fields) do |reply|
    if reply.kind_of?(Array)
      Hash[fields.zip(reply)]
    else
      reply
    end
  end
end

#mapped_hmset(key, hash) ⇒ Object

Set one or more hash values.

Examples:

redis.mapped_hmset("hash", { "f1" => "v1", "f2" => "v2" })
  # => "OK"

Parameters:

  • key (String)
  • hash (Hash) —

    fields mapping to values

See Also:



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# File 'lib/redis.rb', line 1831

def mapped_hmset(key, hash)
  hmset(key, hash.to_a.flatten)
end

#mapped_mget(*keys) ⇒ Hash

Get the values of all the given keys.

Examples:

redis.mapped_mget("key1", "key1")
  # => { "key1" => "v1", "key2" => "v2" }

Parameters:

  • keys (Array<String>) —

    array of keys

Returns:

  • (Hash) —

    a hash mapping the specified keys to their values

See Also:



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# File 'lib/redis.rb', line 816

def mapped_mget(*keys)
  mget(*keys) do |reply|
    if reply.kind_of?(Array)
      Hash[keys.zip(reply)]
    else
      reply
    end
  end
end

#mapped_mset(hash) ⇒ Object

Set one or more values.

Examples:

redis.mapped_mset({ "f1" => "v1", "f2" => "v2" })
  # => "OK"

Parameters:

  • hash (Hash) —

    keys mapping to values

See Also:



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# File 'lib/redis.rb', line 744

def mapped_mset(hash)
  mset(hash.to_a.flatten)
end

#mapped_msetnx(hash) ⇒ Boolean

Set one or more values, only if none of the keys exist.

Examples:

redis.msetnx({ "key1" => "v1", "key2" => "v2" })
  # => true

Parameters:

  • hash (Hash) —

    keys mapping to values

Returns:

  • (Boolean) —

    whether or not all values were set

See Also:



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# File 'lib/redis.rb', line 774

def mapped_msetnx(hash)
  msetnx(hash.to_a.flatten)
end

#mget(*keys, &blk) ⇒ Array<String>

Get the values of all the given keys.

Examples:

redis.mget("key1", "key1")
  # => ["v1", "v2"]

Parameters:

  • keys (Array<String>)

Returns:

  • (Array<String>) —

    an array of values for the specified keys

See Also:



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# File 'lib/redis.rb', line 800

def mget(*keys, &blk)
  synchronize do |client|
    client.call([:mget] + keys, &blk)
  end
end

#migrate(key, options) ⇒ String

Transfer a key from the connected instance to another instance.

Parameters:

  • key (String)
  • options (Hash) —
    • :host => String: host of instance to migrate to
    • :port => Integer: port of instance to migrate to
    • :db => Integer: database to migrate to (default: same as source)
    • :timeout => Integer: timeout (default: same as connection timeout)

Returns:

  • (String) —

    "OK"



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# File 'lib/redis.rb', line 399

def migrate(key, options)
  host = options[:host] || raise(RuntimeError, ":host not specified")
  port = options[:port] || raise(RuntimeError, ":port not specified")
  db = (options[:db] || client.db).to_i
  timeout = (options[:timeout] || client.timeout).to_i

  synchronize do |client|
    client.call([:migrate, host, port, key, db, timeout])
  end
end

#monitor {|line| ... } ⇒ Object

Listen for all requests received by the server in real time.

There is no way to interrupt this command.

Yields:

  • a block to be called for every line of output

Yield Parameters:

  • line (String) —

    timestamp and command that was executed



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# File 'lib/redis.rb', line 221

def monitor(&block)
  synchronize do |client|
    client.call_loop([:monitor], &block)
  end
end

#move(key, db) ⇒ Boolean

Move a key to another database.

Examples:

Move a key to another database

redis.set "foo", "bar"
  # => "OK"
redis.move "foo", 2
  # => true
redis.exists "foo"
  # => false
redis.select 2
  # => "OK"
redis.exists "foo"
  # => true
redis.get "foo"
  # => "bar"

Parameters:

  • key (String)
  • db (Fixnum)

Returns:

  • (Boolean) —

    whether the key was moved or not



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# File 'lib/redis.rb', line 465

def move(key, db)
  synchronize do |client|
    client.call([:move, key, db], &_boolify)
  end
end

#mset(*args) ⇒ Object

Set one or more values.

Examples:

redis.mset("key1", "v1", "key2", "v2")
  # => "OK"

Parameters:

  • args (Array<String>) —

    array of keys and values

See Also:



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# File 'lib/redis.rb', line 728

def mset(*args)
  synchronize do |client|
    client.call([:mset] + args)
  end
end

#msetnx(*args) ⇒ Boolean

Set one or more values, only if none of the keys exist.

Examples:

redis.msetnx("key1", "v1", "key2", "v2")
  # => true

Parameters:

  • args (Array<String>) —

    array of keys and values

Returns:

  • (Boolean) —

    whether or not all values were set

See Also:



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# File 'lib/redis.rb', line 758

def msetnx(*args)
  synchronize do |client|
    client.call([:msetnx] + args, &_boolify)
  end
end

#multi {|multi| ... } ⇒ String, Array<...>

Mark the start of a transaction block.

Passing a block is optional.

Examples:

With a block

redis.multi do |multi|
  multi.set("key", "value")
  multi.incr("counter")
end # => ["OK", 6]

Without a block

redis.multi
  # => "OK"
redis.set("key", "value")
  # => "QUEUED"
redis.incr("counter")
  # => "QUEUED"
redis.exec
  # => ["OK", 6]

Yields:

  • (multi) —

    the commands that are called inside this block are cached and written to the server upon returning from it

Yield Parameters:

Returns:

  • (String, Array<...>) —
    • when a block is not given, OK
    • when a block is given, an array with replies

See Also:



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# File 'lib/redis.rb', line 2106

def multi
  synchronize do |client|
    if !block_given?
      client.call([:multi])
    else
      begin
        pipeline = Pipeline::Multi.new
        original, @client = @client, pipeline
        yield(self)
        original.call_pipeline(pipeline)
      ensure
        @client = original
      end
    end
  end
end

#object(*args) ⇒ Object 



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# File 'lib/redis.rb', line 471

def object(*args)
  synchronize do |client|
    client.call([:object] + args)
  end
end

#persist(key) ⇒ Boolean

Remove the expiration from a key.

Parameters:

  • key (String)

Returns:

  • (Boolean) —

    whether the timeout was removed or not



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# File 'lib/redis.rb', line 296

def persist(key)
  synchronize do |client|
    client.call([:persist, key], &_boolify)
  end
end

#pexpire(key, milliseconds) ⇒ Boolean

Set a key's time to live in milliseconds.

Parameters:

  • key (String)
  • milliseconds (Fixnum) —

    time to live

Returns:

  • (Boolean) —

    whether the timeout was set or not



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# File 'lib/redis.rb', line 340

def pexpire(key, milliseconds)
  synchronize do |client|
    client.call([:pexpire, key, milliseconds], &_boolify)
  end
end

#pexpireat(key, ms_unix_time) ⇒ Boolean

Set the expiration for a key as number of milliseconds from UNIX Epoch.

Parameters:

  • key (String)
  • ms_unix_time (Fixnum) —

    expiry time specified as number of milliseconds from UNIX Epoch.

Returns:

  • (Boolean) —

    whether the timeout was set or not



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# File 'lib/redis.rb', line 351

def pexpireat(key, ms_unix_time)
  synchronize do |client|
    client.call([:pexpireat, key, ms_unix_time], &_boolify)
  end
end

#pfadd(key, member) ⇒ Boolean

Add one or more members to a HyperLogLog structure.

Parameters:

  • key (String)
  • member (String, Array<String>) —

    one member, or array of members

Returns:

  • (Boolean) —

    true if at least 1 HyperLogLog internal register was altered. false otherwise.



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# File 'lib/redis.rb', line 2444

def pfadd(key, member)
  synchronize do |client|
    client.call([:pfadd, key, member], &_boolify)
  end
end

#pfcount(key) ⇒ Fixnum

Get the approximate cardinality of members added to HyperLogLog structure.

Parameters:

  • key (String)

Returns:

  • (Fixnum) 


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# File 'lib/redis.rb', line 2454

def pfcount(key)
  synchronize do |client|
    client.call([:pfcount, key])
  end
end

#pfmerge(dest_key, *source_key) ⇒ Boolean

Merge multiple HyperLogLog values into an unique value that will approximate the cardinality of the union of the observed Sets of the source HyperLogLog structures.

Parameters:

  • dest_key (String) —

    destination key

  • source_key (String, Array<String>) —

    source key, or array of keys

Returns:

  • (Boolean) 


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# File 'lib/redis.rb', line 2466

def pfmerge(dest_key, *source_key)
  synchronize do |client|
    client.call([:pfmerge, dest_key, *source_key], &_boolify_set)
  end
end

#ping ⇒ String

Ping the server.

Returns:

  • (String) —

    PONG



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# File 'lib/redis.rb', line 82

def ping
  synchronize do |client|
    client.call([:ping])
  end
end

#pipelined ⇒ Object 



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# File 'lib/redis.rb', line 2064

def pipelined
  synchronize do |client|
    begin
      original, @client = @client, Pipeline.new
      yield(self)
      original.call_pipeline(@client)
    ensure
      @client = original
    end
  end
end

#psetex(key, ttl, value) ⇒ Object

Set the time to live in milliseconds of a key.

Parameters:

  • key (String)
  • ttl (Fixnum)
  • value (String) 


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# File 'lib/redis.rb', line 701

def psetex(key, ttl, value)
  synchronize do |client|
    client.call([:psetex, key, ttl, value.to_s])
  end
end

#psubscribe(*channels, &block) ⇒ Object

Listen for messages published to channels matching the given patterns.



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# File 'lib/redis.rb', line 1989

def psubscribe(*channels, &block)
  synchronize do |client|
    _subscription(:psubscribe, channels, block)
  end
end

#pttl(key) ⇒ Fixnum

Get the time to live (in milliseconds) for a key.

Parameters:

  • key (String)

Returns:

  • (Fixnum) —

    remaining time to live in milliseconds, or -1 if the key does not exist or does not have a timeout



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# File 'lib/redis.rb', line 362

def pttl(key)
  synchronize do |client|
    client.call([:pttl, key])
  end
end

#publish(channel, message) ⇒ Object

Post a message to a channel.



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# File 'lib/redis.rb', line 1961

def publish(channel, message)
  synchronize do |client|
    client.call([:publish, channel, message])
  end
end

#punsubscribe(*channels) ⇒ Object

Stop listening for messages posted to channels matching the given patterns.



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# File 'lib/redis.rb', line 1996

def punsubscribe(*channels)
  synchronize do |client|
    raise RuntimeError, "Can't unsubscribe if not subscribed." unless subscribed?
    client.punsubscribe(*channels)
  end
end

#quit ⇒ String

Close the connection.

Returns:

  • (String) —

    OK



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# File 'lib/redis.rb', line 101

def quit
  synchronize do |client|
    begin
      client.call([:quit])
    rescue ConnectionError
    ensure
      client.disconnect
    end
  end
end

#randomkey ⇒ String

Return a random key from the keyspace.

Returns:

  • (String) 


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# File 'lib/redis.rb', line 480

def randomkey
  synchronize do |client|
    client.call([:randomkey])
  end
end

#rename(old_name, new_name) ⇒ String

Rename a key. If the new key already exists it is overwritten.

Parameters:

  • old_name (String)
  • new_name (String)

Returns:

  • (String) —

    OK



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# File 'lib/redis.rb', line 491

def rename(old_name, new_name)
  synchronize do |client|
    client.call([:rename, old_name, new_name])
  end
end

#renamenx(old_name, new_name) ⇒ Boolean

Rename a key, only if the new key does not exist.

Parameters:

  • old_name (String)
  • new_name (String)

Returns:

  • (Boolean) —

    whether the key was renamed or not



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# File 'lib/redis.rb', line 502

def renamenx(old_name, new_name)
  synchronize do |client|
    client.call([:renamenx, old_name, new_name], &_boolify)
  end
end

#restore(key, ttl, serialized_value) ⇒ Object

Create a key using the serialized value, previously obtained using DUMP.

Parameters:

  • key (String)
  • ttl (String)
  • serialized_value (String) 


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# File 'lib/redis.rb', line 384

def restore(key, ttl, serialized_value)
  synchronize do |client|
    client.call([:restore, key, ttl, serialized_value])
  end
end

#rpop(key) ⇒ String

Remove and get the last element in a list.

Parameters:

  • key (String)

Returns:

  • (String) 


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# File 'lib/redis.rb', line 1021

def rpop(key)
  synchronize do |client|
    client.call([:rpop, key])
  end
end

#rpoplpush(source, destination) ⇒ nil, String

Remove the last element in a list, append it to another list and return it.

Parameters:

  • source (String) —

    source key

  • destination (String) —

    destination key

Returns:

  • (nil, String) —

    the element, or nil when the source key does not exist



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# File 'lib/redis.rb', line 1032

def rpoplpush(source, destination)
  synchronize do |client|
    client.call([:rpoplpush, source, destination])
  end
end

#rpush(key, value) ⇒ Fixnum

Append one or more values to a list, creating the list if it doesn't exist

Parameters:

  • key (String)
  • value (String)

Returns:

  • (Fixnum) —

    the length of the list after the push operation



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# File 'lib/redis.rb', line 990

def rpush(key, value)
  synchronize do |client|
    client.call([:rpush, key, value])
  end
end

#rpushx(key, value) ⇒ Fixnum

Append a value to a list, only if the list exists.

Parameters:

  • key (String)
  • value (String)

Returns:

  • (Fixnum) —

    the length of the list after the push operation



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# File 'lib/redis.rb', line 1001

def rpushx(key, value)
  synchronize do |client|
    client.call([:rpushx, key, value])
  end
end

#sadd(key, member) ⇒ Boolean, Fixnum

Add one or more members to a set.

Parameters:

  • key (String)
  • member (String, Array<String>) —

    one member, or array of members

Returns:

  • (Boolean, Fixnum) —

    Boolean when a single member is specified, holding whether or not adding the member succeeded, or Fixnum when an array of members is specified, holding the number of members that were successfully added



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# File 'lib/redis.rb', line 1225

def sadd(key, member)
  synchronize do |client|
    client.call([:sadd, key, member]) do |reply|
      if member.is_a? Array
        # Variadic: return integer
        reply
      else
        # Single argument: return boolean
        _boolify.call(reply)
      end
    end
  end
end

#save ⇒ String

Synchronously save the dataset to disk.

Returns:

  • (String) 


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# File 'lib/redis.rb', line 230

def save
  synchronize do |client|
    client.call([:save])
  end
end

#scan(cursor, options = {}) ⇒ String+

Scan the keyspace

Examples:

Retrieve the first batch of keys

redis.scan(0)
  # => ["4", ["key:21", "key:47", "key:42"]]

Retrieve a batch of keys matching a pattern

redis.scan(4, :match => "key:1?")
  # => ["92", ["key:13", "key:18"]]

Parameters:

  • cursor: (String, Integer) —

    the cursor of the iteration

  • options (Hash) (defaults to: {}) —
    • :match => String: only return keys matching the pattern
    • :count => Integer: return count keys at most per iteration

Returns:

  • (String, Array<String>) —

    the next cursor and all found keys



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# File 'lib/redis.rb', line 2297

def scan(cursor, options={})
  _scan(:scan, cursor, [], options)
end

#scan_each(options = {}, &block) ⇒ Enumerator

Scan the keyspace

Examples:

Retrieve all of the keys (with possible duplicates)

redis.scan_each.to_a
  # => ["key:21", "key:47", "key:42"]

Execute block for each key matching a pattern

redis.scan_each(:match => "key:1?") {|key| puts key}
  # => key:13
  # => key:18

Parameters:

  • options (Hash) (defaults to: {}) —
    • :match => String: only return keys matching the pattern
    • :count => Integer: return count keys at most per iteration

Returns:

  • (Enumerator) —

    an enumerator for all found keys



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# File 'lib/redis.rb', line 2316

def scan_each(options={}, &block)
  return to_enum(:scan_each, options) unless block_given?
  cursor = 0
  loop do
    cursor, keys = scan(cursor, options)
    keys.each(&block)
    break if cursor == "0"
  end
end

#scard(key) ⇒ Fixnum

Get the number of members in a set.

Parameters:

  • key (String)

Returns:

  • (Fixnum) 


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# File 'lib/redis.rb', line 1211

def scard(key)
  synchronize do |client|
    client.call([:scard, key])
  end
end

#script(subcommand, *args) ⇒ String, ...

Control remote script registry.

Examples:

Load a script

sha = redis.script(:load, "return 1")
  # => <sha of this script>

Check if a script exists

redis.script(:exists, sha)
  # => true

Check if multiple scripts exist

redis.script(:exists, [sha, other_sha])
  # => [true, false]

Flush the script registry

redis.script(:flush)
  # => "OK"

Kill a running script

redis.script(:kill)
  # => "OK"

Parameters:

  • subcommand (String) —

    e.g. exists, flush, load, kill

  • args (Array<String>) —

    depends on subcommand

Returns:

  • (String, Boolean, Array<Boolean>, ...) —

    depends on subcommand

See Also:



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# File 'lib/redis.rb', line 2177

def script(subcommand, *args)
  subcommand = subcommand.to_s.downcase

  if subcommand == "exists"
    synchronize do |client|
      arg = args.first

      client.call([:script, :exists, arg]) do |reply|
        reply = reply.map { |r| _boolify.call(r) }

        if arg.is_a?(Array)
          reply
        else
          reply.first
        end
      end
    end
  else
    synchronize do |client|
      client.call([:script, subcommand] + args)
    end
  end
end

#sdiff(*keys) ⇒ Array<String>

Subtract multiple sets.

Parameters:

  • keys (String, Array<String>) —

    keys pointing to sets to subtract

Returns:

  • (Array<String>) —

    members in the difference



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# File 'lib/redis.rb', line 1323

def sdiff(*keys)
  synchronize do |client|
    client.call([:sdiff] + keys)
  end
end

#sdiffstore(destination, *keys) ⇒ Fixnum

Subtract multiple sets and store the resulting set in a key.

Parameters:

  • destination (String) —

    destination key

  • keys (String, Array<String>) —

    keys pointing to sets to subtract

Returns:

  • (Fixnum) —

    number of elements in the resulting set



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# File 'lib/redis.rb', line 1334

def sdiffstore(destination, *keys)
  synchronize do |client|
    client.call([:sdiffstore, destination] + keys)
  end
end

#select(db) ⇒ String

Change the selected database for the current connection.

Parameters:

  • db (Fixnum) —

    zero-based index of the DB to use (0 to 15)

Returns:

  • (String) —

    OK



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# File 'lib/redis.rb', line 72

def select(db)
  synchronize do |client|
    client.db = db
    client.call([:select, db])
  end
end

#set(key, value, options = {}) ⇒ String, Boolean Also known as: []=

Set the string value of a key.

Parameters:

  • key (String)
  • value (String)
  • options (Hash) (defaults to: {}) —
    • :ex => Fixnum: Set the specified expire time, in seconds.
    • :px => Fixnum: Set the specified expire time, in milliseconds.
    • :nx => true: Only set the key if it does not already exist.
    • :xx => true: Only set the key if it already exist.

Returns:

  • (String, Boolean) —

    "OK" or true, false if :nx => true or :xx => true



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# File 'lib/redis.rb', line 657

def set(key, value, options = {})
  args = []

  ex = options[:ex]
  args.concat(["EX", ex]) if ex

  px = options[:px]
  args.concat(["PX", px]) if px

  nx = options[:nx]
  args.concat(["NX"]) if nx

  xx = options[:xx]
  args.concat(["XX"]) if xx

  synchronize do |client|
    if nx || xx
      client.call([:set, key, value.to_s] + args, &_boolify_set)
    else
      client.call([:set, key, value.to_s] + args)
    end
  end
end

#setbit(key, offset, value) ⇒ Fixnum

Sets or clears the bit at offset in the string value stored at key.

Parameters:

  • key (String)
  • offset (Fixnum) —

    bit offset

  • value (Fixnum) —

    bit value 0 or 1

Returns:

  • (Fixnum) —

    the original bit value stored at offset



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# File 'lib/redis.rb', line 857

def setbit(key, offset, value)
  synchronize do |client|
    client.call([:setbit, key, offset, value])
  end
end

#setex(key, ttl, value) ⇒ Object

Set the time to live in seconds of a key.

Parameters:

  • key (String)
  • ttl (Fixnum)
  • value (String) 


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# File 'lib/redis.rb', line 689

def setex(key, ttl, value)
  synchronize do |client|
    client.call([:setex, key, ttl, value.to_s])
  end
end

#setnx(key, value) ⇒ Boolean

Set the value of a key, only if the key does not exist.

Parameters:

  • key (String)
  • value (String)

Returns:

  • (Boolean) —

    whether the key was set or not



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# File 'lib/redis.rb', line 712

def setnx(key, value)
  synchronize do |client|
    client.call([:setnx, key, value.to_s], &_boolify)
  end
end

#setrange(key, offset, value) ⇒ Fixnum

Overwrite part of a string at key starting at the specified offset.

Parameters:

  • key (String)
  • offset (Fixnum) —

    byte offset

  • value (String)

Returns:

  • (Fixnum) —

    length of the string after it was modified



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# File 'lib/redis.rb', line 832

def setrange(key, offset, value)
  synchronize do |client|
    client.call([:setrange, key, offset, value.to_s])
  end
end

#shutdown ⇒ Object

Synchronously save the dataset to disk and then shut down the server.



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# File 'lib/redis.rb', line 237

def shutdown
  synchronize do |client|
    client.with_reconnect(false) do
      begin
        client.call([:shutdown])
      rescue ConnectionError
        # This means Redis has probably exited.
        nil
      end
    end
  end
end

#sinter(*keys) ⇒ Array<String>

Intersect multiple sets.

Parameters:

  • keys (String, Array<String>) —

    keys pointing to sets to intersect

Returns:

  • (Array<String>) —

    members in the intersection



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# File 'lib/redis.rb', line 1344

def sinter(*keys)
  synchronize do |client|
    client.call([:sinter] + keys)
  end
end

#sinterstore(destination, *keys) ⇒ Fixnum

Intersect multiple sets and store the resulting set in a key.

Parameters:

  • destination (String) —

    destination key

  • keys (String, Array<String>) —

    keys pointing to sets to intersect

Returns:

  • (Fixnum) —

    number of elements in the resulting set



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# File 'lib/redis.rb', line 1355

def sinterstore(destination, *keys)
  synchronize do |client|
    client.call([:sinterstore, destination] + keys)
  end
end

#sismember(key, member) ⇒ Boolean

Determine if a given value is a member of a set.

Parameters:

  • key (String)
  • member (String)

Returns:

  • (Boolean) 


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# File 'lib/redis.rb', line 1303

def sismember(key, member)
  synchronize do |client|
    client.call([:sismember, key, member], &_boolify)
  end
end

#slaveof(host, port) ⇒ Object

Make the server a slave of another instance, or promote it as master.



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# File 'lib/redis.rb', line 251

def slaveof(host, port)
  synchronize do |client|
    client.call([:slaveof, host, port])
  end
end

#slowlog(subcommand, length = nil) ⇒ Array<String>, ...

Interact with the slowlog (get, len, reset)

Parameters:

  • subcommand (String) —

    e.g. get, len, reset

  • length (Fixnum) (defaults to: nil) —

    maximum number of entries to return

Returns:

  • (Array<String>, Fixnum, String) —

    depends on subcommand



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# File 'lib/redis.rb', line 262

def slowlog(subcommand, length=nil)
  synchronize do |client|
    args = [:slowlog, subcommand]
    args << length if length
    client.call args
  end
end

#smembers(key) ⇒ Array<String>

Get all the members in a set.

Parameters:

  • key (String)

Returns:

  • (Array<String>) 


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# File 'lib/redis.rb', line 1313

def smembers(key)
  synchronize do |client|
    client.call([:smembers, key])
  end
end

#smove(source, destination, member) ⇒ Boolean

Move a member from one set to another.

Parameters:

  • source (String) —

    source key

  • destination (String) —

    destination key

  • member (String) —

    member to move from source to destination

Returns:

  • (Boolean) 


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# File 'lib/redis.rb', line 1292

def smove(source, destination, member)
  synchronize do |client|
    client.call([:smove, source, destination, member], &_boolify)
  end
end

#sort(key, options = {}) ⇒ Array<String>, ...

Sort the elements in a list, set or sorted set.

Examples:

Retrieve the first 2 elements from an alphabetically sorted "list"

redis.sort("list", :order => "alpha", :limit => [0, 2])
  # => ["a", "b"]

Store an alphabetically descending list in "target"

redis.sort("list", :order => "desc alpha", :store => "target")
  # => 26

Parameters:

  • key (String)
  • options (Hash) (defaults to: {}) —
    • :by => String: use external key to sort elements by
    • :limit => [offset, count]: skip offset elements, return a maximum of count elements
    • :get => [String, Array<String>]: single key or array of keys to retrieve per element in the result
    • :order => String: combination of ASC, DESC and optionally ALPHA
    • :store => String: key to store the result at

Returns:

  • (Array<String>, Array<Array<String>>, Fixnum) —
    • when :get is not specified, or holds a single element, an array of elements
    • when :get is specified, and holds more than one element, an array of elements where every element is an array with the result for every element specified in :get
    • when :store is specified, the number of elements in the stored result


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# File 'lib/redis.rb', line 533

def sort(key, options = {})
  args = []

  by = options[:by]
  args.concat(["BY", by]) if by

  limit = options[:limit]
  args.concat(["LIMIT"] + limit) if limit

  get = Array(options[:get])
  args.concat(["GET"].product(get).flatten) unless get.empty?

  order = options[:order]
  args.concat(order.split(" ")) if order

  store = options[:store]
  args.concat(["STORE", store]) if store

  synchronize do |client|
    client.call([:sort, key] + args) do |reply|
      if get.size > 1 && !store
        if reply
          reply.each_slice(get.size).to_a
        end
      else
        reply
      end
    end
  end
end

#spop(key) ⇒ String

Remove and return a random member from a set.

Parameters:

  • key (String)

Returns:

  • (String) 


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# File 'lib/redis.rb', line 1265

def spop(key)
  synchronize do |client|
    client.call([:spop, key])
  end
end

#srandmember(key, count = nil) ⇒ String

Get one or more random members from a set.

Parameters:

  • key (String)
  • count (Fixnum) (defaults to: nil)

Returns:

  • (String) 


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# File 'lib/redis.rb', line 1276

def srandmember(key, count = nil)
  synchronize do |client|
    if count.nil?
      client.call([:srandmember, key])
    else
      client.call([:srandmember, key, count])
    end
  end
end

#srem(key, member) ⇒ Boolean, Fixnum

Remove one or more members from a set.

Parameters:

  • key (String)
  • member (String, Array<String>) —

    one member, or array of members

Returns:

  • (Boolean, Fixnum) —

    Boolean when a single member is specified, holding whether or not removing the member succeeded, or Fixnum when an array of members is specified, holding the number of members that were successfully removed



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# File 'lib/redis.rb', line 1247

def srem(key, member)
  synchronize do |client|
    client.call([:srem, key, member]) do |reply|
      if member.is_a? Array
        # Variadic: return integer
        reply
      else
        # Single argument: return boolean
        _boolify.call(reply)
      end
    end
  end
end

#sscan(key, cursor, options = {}) ⇒ String+

Scan a set

Examples:

Retrieve the first batch of keys in a set

redis.sscan("set", 0)

Parameters:

  • cursor: (String, Integer) —

    the cursor of the iteration

  • options (Hash) (defaults to: {}) —
    • :match => String: only return keys matching the pattern
    • :count => Integer: return count keys at most per iteration

Returns:

  • (String, Array<String>) —

    the next cursor and all found members



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# File 'lib/redis.rb', line 2414

def sscan(key, cursor, options={})
  _scan(:sscan, cursor, [key], options)
end

#sscan_each(key, options = {}, &block) ⇒ Enumerator

Scan a set

Examples:

Retrieve all of the keys in a set

redis.sscan("set").to_a
# => ["key1", "key2", "key3"]

Parameters:

  • options (Hash) (defaults to: {}) —
    • :match => String: only return keys matching the pattern
    • :count => Integer: return count keys at most per iteration

Returns:

  • (Enumerator) —

    an enumerator for all keys in the set



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# File 'lib/redis.rb', line 2429

def sscan_each(key, options={}, &block)
  return to_enum(:sscan_each, key, options) unless block_given?
  cursor = 0
  loop do
    cursor, keys = sscan(key, cursor, options)
    keys.each(&block)
    break if cursor == "0"
  end
end

#strlen(key) ⇒ Fixnum

Get the length of the value stored in a key.

Parameters:

  • key (String)

Returns:

  • (Fixnum) —

    the length of the value stored in the key, or 0 if the key does not exist



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# File 'lib/redis.rb', line 947

def strlen(key)
  synchronize do |client|
    client.call([:strlen, key])
  end
end

#subscribe(*channels, &block) ⇒ Object

Listen for messages published to the given channels.



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# File 'lib/redis.rb', line 1974

def subscribe(*channels, &block)
  synchronize do |client|
    _subscription(:subscribe, channels, block)
  end
end

#subscribed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/redis.rb', line 1967

def subscribed?
  synchronize do |client|
    client.kind_of? SubscribedClient
  end
end

#sunion(*keys) ⇒ Array<String>

Add multiple sets.

Parameters:

  • keys (String, Array<String>) —

    keys pointing to sets to unify

Returns:

  • (Array<String>) —

    members in the union



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# File 'lib/redis.rb', line 1365

def sunion(*keys)
  synchronize do |client|
    client.call([:sunion] + keys)
  end
end

#sunionstore(destination, *keys) ⇒ Fixnum

Add multiple sets and store the resulting set in a key.

Parameters:

  • destination (String) —

    destination key

  • keys (String, Array<String>) —

    keys pointing to sets to unify

Returns:

  • (Fixnum) —

    number of elements in the resulting set



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# File 'lib/redis.rb', line 1376

def sunionstore(destination, *keys)
  synchronize do |client|
    client.call([:sunionstore, destination] + keys)
  end
end

#sync ⇒ Object

Internal command used for replication.



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# File 'lib/redis.rb', line 271

def sync
  synchronize do |client|
    client.call([:sync])
  end
end

#synchronize ⇒ Object 



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# File 'lib/redis.rb', line 36

def synchronize
  mon_synchronize { yield(@client) }
end

#time ⇒ Array<Fixnum>

Return the server time.

Examples:

r.time # => [ 1333093196, 606806 ]

Returns:

  • (Array<Fixnum>) —

    tuple of seconds since UNIX epoch and microseconds in the current second



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# File 'lib/redis.rb', line 284

def time
  synchronize do |client|
    client.call([:time]) do |reply|
      reply.map(&:to_i) if reply
    end
  end
end

#ttl(key) ⇒ Fixnum

Get the time to live (in seconds) for a key.

Parameters:

  • key (String)

Returns:

  • (Fixnum) —

    remaining time to live in seconds, or -1 if the key does not exist or does not have a timeout



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# File 'lib/redis.rb', line 329

def ttl(key)
  synchronize do |client|
    client.call([:ttl, key])
  end
end

#type(key) ⇒ String

Determine the type stored at key.

Parameters:

  • key (String)

Returns:

  • (String) —

    string, list, set, zset, hash or none



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# File 'lib/redis.rb', line 568

def type(key)
  synchronize do |client|
    client.call([:type, key])
  end
end

#unsubscribe(*channels) ⇒ Object

Stop listening for messages posted to the given channels.



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# File 'lib/redis.rb', line 1981

def unsubscribe(*channels)
  synchronize do |client|
    raise RuntimeError, "Can't unsubscribe if not subscribed." unless subscribed?
    client.unsubscribe(*channels)
  end
end

#unwatch ⇒ String

Forget about all watched keys.

Returns:

  • (String) —

    OK

See Also:



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# File 'lib/redis.rb', line 2058

def unwatch
  synchronize do |client|
    client.call([:unwatch])
  end
end

#watch(*keys) ⇒ Object, String

Watch the given keys to determine execution of the MULTI/EXEC block.

Using a block is optional, but is necessary for thread-safety.

An #unwatch is automatically issued if an exception is raised within the block that is a subclass of StandardError and is not a ConnectionError.

Examples:

With a block

redis.watch("key") do
  if redis.get("key") == "some value"
    redis.multi do |multi|
      multi.set("key", "other value")
      multi.incr("counter")
    end
  else
    redis.unwatch
  end
end
  # => ["OK", 6]

Without a block

redis.watch("key")
  # => "OK"

Parameters:

  • keys (String, Array<String>) —

    one or more keys to watch

Returns:

  • (Object) —

    if using a block, returns the return value of the block

  • (String) —

    if not using a block, returns OK

See Also:



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# File 'lib/redis.rb', line 2033

def watch(*keys)
  synchronize do |client|
    res = client.call([:watch] + keys)

    if block_given?
      begin
        yield(self)
      rescue ConnectionError
        raise
      rescue StandardError
        unwatch
        raise
      end
    else
      res
    end
  end
end

#with_reconnect(val = true, &blk) ⇒ Object

Run code with the client reconnecting



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# File 'lib/redis.rb', line 41

def with_reconnect(val=true, &blk)
  synchronize do |client|
    client.with_reconnect(val, &blk)
  end
end

#without_reconnect(&blk) ⇒ Object

Run code without the client reconnecting



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# File 'lib/redis.rb', line 48

def without_reconnect(&blk)
  with_reconnect(false, &blk)
end

#zadd(key, *args) ⇒ Boolean, Fixnum

Add one or more members to a sorted set, or update the score for members that already exist.

Examples:

Add a single [score, member] pair to a sorted set

redis.zadd("zset", 32.0, "member")

Add an array of [score, member] pairs to a sorted set

redis.zadd("zset", [[32.0, "a"], [64.0, "b"]])

Parameters:

  • key (String)
  • args ([Float, String], Array<[Float, String]>) —
    • a single [score, member] pair
    • an array of [score, member] pairs

Returns:

  • (Boolean, Fixnum) —
    • Boolean when a single pair is specified, holding whether or not it was added to the sorted set
    • Fixnum when an array of pairs is specified, holding the number of pairs that were added to the sorted set


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# File 'lib/redis.rb', line 1414

def zadd(key, *args)
  synchronize do |client|
    if args.size == 1 && args[0].is_a?(Array)
      # Variadic: return integer
      client.call([:zadd, key] + args[0])
    elsif args.size == 2
      # Single pair: return boolean
      client.call([:zadd, key, args[0], args[1]], &_boolify)
    else
      raise ArgumentError, "wrong number of arguments"
    end
  end
end

#zcard(key) ⇒ Fixnum

Get the number of members in a sorted set.

Examples:

redis.zcard("zset")
  # => 4

Parameters:

  • key (String)

Returns:

  • (Fixnum) 


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# File 'lib/redis.rb', line 1390

def zcard(key)
  synchronize do |client|
    client.call([:zcard, key])
  end
end

#zcount(key, min, max) ⇒ Fixnum

Count the members in a sorted set with scores within the given values.

Examples:

Count members with score >= 5 and < 100

redis.zcount("zset", "5", "(100")
  # => 2

Count members with scores > 5

redis.zcount("zset", "(5", "+inf")
  # => 2

Parameters:

  • key (String)
  • min (String) —
    • inclusive minimum score is specified verbatim
    • exclusive minimum score is specified by prefixing (
  • max (String) —
    • inclusive maximum score is specified verbatim
    • exclusive maximum score is specified by prefixing (

Returns:

  • (Fixnum) —

    number of members in within the specified range



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# File 'lib/redis.rb', line 1708

def zcount(key, min, max)
  synchronize do |client|
    client.call([:zcount, key, min, max])
  end
end

#zincrby(key, increment, member) ⇒ Float

Increment the score of a member in a sorted set.

Examples:

redis.zincrby("zset", 32.0, "a")
  # => 64.0

Parameters:

  • key (String)
  • increment (Float)
  • member (String)

Returns:

  • (Float) —

    score of the member after incrementing it



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# File 'lib/redis.rb', line 1438

def zincrby(key, increment, member)
  synchronize do |client|
    client.call([:zincrby, key, increment, member], &_floatify)
  end
end

#zinterstore(destination, keys, options = {}) ⇒ Fixnum

Intersect multiple sorted sets and store the resulting sorted set in a new key.

Examples:

Compute the intersection of 2*zsetA with 1*zsetB, summing their scores

redis.zinterstore("zsetC", ["zsetA", "zsetB"], :weights => [2.0, 1.0], :aggregate => "sum")
  # => 4

Parameters:

  • destination (String) —

    destination key

  • keys (Array<String>) —

    source keys

  • options (Hash) (defaults to: {}) —
    • :weights => [Float, Float, ...]: weights to associate with source sorted sets
    • :aggregate => String: aggregate function to use (sum, min, max, ...)

Returns:

  • (Fixnum) —

    number of elements in the resulting sorted set



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# File 'lib/redis.rb', line 1728

def zinterstore(destination, keys, options = {})
  args = []

  weights = options[:weights]
  args.concat(["WEIGHTS"] + weights) if weights

  aggregate = options[:aggregate]
  args.concat(["AGGREGATE", aggregate]) if aggregate

  synchronize do |client|
    client.call([:zinterstore, destination, keys.size] + keys + args)
  end
end

#zrange(key, start, stop, options = {}) ⇒ Array<String>, Array<[String, Float]>

Return a range of members in a sorted set, by index.

Examples:

Retrieve all members from a sorted set

redis.zrange("zset", 0, -1)
  # => ["a", "b"]

Retrieve all members and their scores from a sorted set

redis.zrange("zset", 0, -1, :with_scores => true)
  # => [["a", 32.0], ["b", 64.0]]

Parameters:

  • key (String)
  • start (Fixnum) —

    start index

  • stop (Fixnum) —

    stop index

  • options (Hash) (defaults to: {}) —
    • :with_scores => true: include scores in output

Returns:

  • (Array<String>, Array<[String, Float]>) —
    • when :with_scores is not specified, an array of members
    • when :with_scores is specified, an array with [member, score] pairs


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# File 'lib/redis.rb', line 1508

def zrange(key, start, stop, options = {})
  args = []

  with_scores = options[:with_scores] || options[:withscores]

  if with_scores
    args << "WITHSCORES"
    block = _floatify_pairs
  end

  synchronize do |client|
    client.call([:zrange, key, start, stop] + args, &block)
  end
end

#zrangebyscore(key, min, max, options = {}) ⇒ Array<String>, Array<[String, Float]>

Return a range of members in a sorted set, by score.

Examples:

Retrieve members with score >= 5 and < 100

redis.zrangebyscore("zset", "5", "(100")
  # => ["a", "b"]

Retrieve the first 2 members with score >= 0

redis.zrangebyscore("zset", "0", "+inf", :limit => [0, 2])
  # => ["a", "b"]

Retrieve members and their scores with scores > 5

redis.zrangebyscore("zset", "(5", "+inf", :with_scores => true)
  # => [["a", 32.0], ["b", 64.0]]

Parameters:

  • key (String)
  • min (String) —
    • inclusive minimum score is specified verbatim
    • exclusive minimum score is specified by prefixing (
  • max (String) —
    • inclusive maximum score is specified verbatim
    • exclusive maximum score is specified by prefixing (
  • options (Hash) (defaults to: {}) —
    • :with_scores => true: include scores in output
    • :limit => [offset, count]: skip offset members, return a maximum of count members

Returns:

  • (Array<String>, Array<[String, Float]>) —
    • when :with_scores is not specified, an array of members
    • when :with_scores is specified, an array with [member, score] pairs


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# File 'lib/redis.rb', line 1618

def zrangebyscore(key, min, max, options = {})
  args = []

  with_scores = options[:with_scores] || options[:withscores]

  if with_scores
    args << "WITHSCORES"
    block = _floatify_pairs
  end

  limit = options[:limit]
  args.concat(["LIMIT"] + limit) if limit

  synchronize do |client|
    client.call([:zrangebyscore, key, min, max] + args, &block)
  end
end

#zrank(key, member) ⇒ Fixnum

Determine the index of a member in a sorted set.

Parameters:

  • key (String)
  • member (String)

Returns:

  • (Fixnum) 


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# File 'lib/redis.rb', line 1554

def zrank(key, member)
  synchronize do |client|
    client.call([:zrank, key, member])
  end
end

#zrem(key, member) ⇒ Boolean, Fixnum

Remove one or more members from a sorted set.

Examples:

Remove a single member from a sorted set

redis.zrem("zset", "a")

Remove an array of members from a sorted set

redis.zrem("zset", ["a", "b"])

Parameters:

  • key (String)
  • member (String, Array<String>) —
    • a single member
    • an array of members

Returns:

  • (Boolean, Fixnum) —
    • Boolean when a single member is specified, holding whether or not it was removed from the sorted set
    • Fixnum when an array of pairs is specified, holding the number of members that were removed to the sorted set


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# File 'lib/redis.rb', line 1461

def zrem(key, member)
  synchronize do |client|
    client.call([:zrem, key, member]) do |reply|
      if member.is_a? Array
        # Variadic: return integer
        reply
      else
        # Single argument: return boolean
        _boolify.call(reply)
      end
    end
  end
end

#zremrangebyrank(key, start, stop) ⇒ Fixnum

Remove all members in a sorted set within the given indexes.

Examples:

Remove first 5 members

redis.zremrangebyrank("zset", 0, 4)
  # => 5

Remove last 5 members

redis.zremrangebyrank("zset", -5, -1)
  # => 5

Parameters:

  • key (String)
  • start (Fixnum) —

    start index

  • stop (Fixnum) —

    stop index

Returns:

  • (Fixnum) —

    number of members that were removed



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# File 'lib/redis.rb', line 1585

def zremrangebyrank(key, start, stop)
  synchronize do |client|
    client.call([:zremrangebyrank, key, start, stop])
  end
end

#zremrangebyscore(key, min, max) ⇒ Fixnum

Remove all members in a sorted set within the given scores.

Examples:

Remove members with score >= 5 and < 100

redis.zremrangebyscore("zset", "5", "(100")
  # => 2

Remove members with scores > 5

redis.zremrangebyscore("zset", "(5", "+inf")
  # => 2

Parameters:

  • key (String)
  • min (String) —
    • inclusive minimum score is specified verbatim
    • exclusive minimum score is specified by prefixing (
  • max (String) —
    • inclusive maximum score is specified verbatim
    • exclusive maximum score is specified by prefixing (

Returns:

  • (Fixnum) —

    number of members that were removed



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# File 'lib/redis.rb', line 1685

def zremrangebyscore(key, min, max)
  synchronize do |client|
    client.call([:zremrangebyscore, key, min, max])
  end
end

#zrevrange(key, start, stop, options = {}) ⇒ Object

Return a range of members in a sorted set, by index, with scores ordered from high to low.

Examples:

Retrieve all members from a sorted set

redis.zrevrange("zset", 0, -1)
  # => ["b", "a"]

Retrieve all members and their scores from a sorted set

redis.zrevrange("zset", 0, -1, :with_scores => true)
  # => [["b", 64.0], ["a", 32.0]]

See Also:



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# File 'lib/redis.rb', line 1534

def zrevrange(key, start, stop, options = {})
  args = []

  with_scores = options[:with_scores] || options[:withscores]

  if with_scores
    args << "WITHSCORES"
    block = _floatify_pairs
  end

  synchronize do |client|
    client.call([:zrevrange, key, start, stop] + args, &block)
  end
end

#zrevrangebyscore(key, max, min, options = {}) ⇒ Object

Return a range of members in a sorted set, by score, with scores ordered from high to low.

Examples:

Retrieve members with score < 100 and >= 5

redis.zrevrangebyscore("zset", "(100", "5")
  # => ["b", "a"]

Retrieve the first 2 members with score <= 0

redis.zrevrangebyscore("zset", "0", "-inf", :limit => [0, 2])
  # => ["b", "a"]

Retrieve members and their scores with scores > 5

redis.zrevrangebyscore("zset", "+inf", "(5", :with_scores => true)
  # => [["b", 64.0], ["a", 32.0]]

See Also:



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# File 'lib/redis.rb', line 1650

def zrevrangebyscore(key, max, min, options = {})
  args = []

  with_scores = options[:with_scores] || options[:withscores]

  if with_scores
    args << ["WITHSCORES"]
    block = _floatify_pairs
  end

  limit = options[:limit]
  args.concat(["LIMIT"] + limit) if limit

  synchronize do |client|
    client.call([:zrevrangebyscore, key, max, min] + args, &block)
  end
end

#zrevrank(key, member) ⇒ Fixnum

Determine the index of a member in a sorted set, with scores ordered from high to low.

Parameters:

  • key (String)
  • member (String)

Returns:

  • (Fixnum) 


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# File 'lib/redis.rb', line 1566

def zrevrank(key, member)
  synchronize do |client|
    client.call([:zrevrank, key, member])
  end
end

#zscan(key, cursor, options = {}) ⇒ String, Array<[String, Float]>

Scan a sorted set

Examples:

Retrieve the first batch of key/value pairs in a hash

redis.zscan("zset", 0)

Parameters:

  • cursor: (String, Integer) —

    the cursor of the iteration

  • options (Hash) (defaults to: {}) —
    • :match => String: only return keys matching the pattern
    • :count => Integer: return count keys at most per iteration

Returns:

  • (String, Array<[String, Float]>) —

    the next cursor and all found members and scores



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# File 'lib/redis.rb', line 2376

def zscan(key, cursor, options={})
  _scan(:zscan, cursor, [key], options) do |reply|
    [reply[0], _floatify_pairs.call(reply[1])]
  end
end

#zscan_each(key, options = {}, &block) ⇒ Enumerator

Scan a sorted set

Examples:

Retrieve all of the members/scores in a sorted set

redis.zscan_each("zset").to_a
# => [["key70", "70"], ["key80", "80"]]

Parameters:

  • options (Hash) (defaults to: {}) —
    • :match => String: only return keys matching the pattern
    • :count => Integer: return count keys at most per iteration

Returns:

  • (Enumerator) —

    an enumerator for all found scores and members



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# File 'lib/redis.rb', line 2393

def zscan_each(key, options={}, &block)
  return to_enum(:zscan_each, key, options) unless block_given?
  cursor = 0
  loop do
    cursor, values = zscan(key, cursor, options)
    values.each(&block)
    break if cursor == "0"
  end
end

#zscore(key, member) ⇒ Float

Get the score associated with the given member in a sorted set.

Examples:

Get the score for member "a"

redis.zscore("zset", "a")
  # => 32.0

Parameters:

  • key (String)
  • member (String)

Returns:

  • (Float) —

    score of the member



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# File 'lib/redis.rb', line 1484

def zscore(key, member)
  synchronize do |client|
    client.call([:zscore, key, member], &_floatify)
  end
end

#zunionstore(destination, keys, options = {}) ⇒ Fixnum

Add multiple sorted sets and store the resulting sorted set in a new key.

Examples:

Compute the union of 2*zsetA with 1*zsetB, summing their scores

redis.zunionstore("zsetC", ["zsetA", "zsetB"], :weights => [2.0, 1.0], :aggregate => "sum")
  # => 8

Parameters:

  • destination (String) —

    destination key

  • keys (Array<String>) —

    source keys

  • options (Hash) (defaults to: {}) —
    • :weights => [Float, Float, ...]: weights to associate with source sorted sets
    • :aggregate => String: aggregate function to use (sum, min, max, ...)

Returns:

  • (Fixnum) —

    number of elements in the resulting sorted set



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# File 'lib/redis.rb', line 1755

def zunionstore(destination, keys, options = {})
  args = []

  weights = options[:weights]
  args.concat(["WEIGHTS"] + weights) if weights

  aggregate = options[:aggregate]
  args.concat(["AGGREGATE", aggregate]) if aggregate

  synchronize do |client|
    client.call([:zunionstore, destination, keys.size] + keys + args)
  end
end