Class: Redis::Client
- Inherits:
-
Object
- Object
- Redis::Client
- Defined in:
- lib/redis/client.rb
Direct Known Subclasses
Defined Under Namespace
Classes: ProtocolError
Constant Summary collapse
- OK =
"OK".freeze
- MINUS =
"-".freeze
- PLUS =
"+".freeze
- COLON =
":".freeze
- DOLLAR =
"$".freeze
- ASTERISK =
"*".freeze
- BULK_COMMANDS =
{ "set" => true, "setnx" => true, "rpush" => true, "lpush" => true, "lset" => true, "lrem" => true, "sadd" => true, "srem" => true, "sismember" => true, "echo" => true, "getset" => true, "smove" => true, "zadd" => true, "zincrby" => true, "zrem" => true, "zscore" => true, "zrank" => true, "zrevrank" => true, "hget" => true, "hdel" => true, "hexists" => true, "publish" => true }
- MULTI_BULK_COMMANDS =
{ "mset" => true, "msetnx" => true, "hset" => true, "hmset" => true }
- BOOLEAN_PROCESSOR =
lambda{|r| r == 1 }
- REPLY_PROCESSOR =
{ "exists" => BOOLEAN_PROCESSOR, "sismember" => BOOLEAN_PROCESSOR, "sadd" => BOOLEAN_PROCESSOR, "srem" => BOOLEAN_PROCESSOR, "smove" => BOOLEAN_PROCESSOR, "zadd" => BOOLEAN_PROCESSOR, "zrem" => BOOLEAN_PROCESSOR, "move" => BOOLEAN_PROCESSOR, "setnx" => BOOLEAN_PROCESSOR, "del" => BOOLEAN_PROCESSOR, "renamenx" => BOOLEAN_PROCESSOR, "expire" => BOOLEAN_PROCESSOR, "hset" => BOOLEAN_PROCESSOR, "hexists" => BOOLEAN_PROCESSOR, "info" => lambda{|r| info = Hash.new do |hash, key| if hash.include?(key.to_s) Redis.deprecate "Redis#info will return a hash of string keys, not symbols", caller[2] hash[key.to_s] end end r.each_line {|kv| k,v = kv.split(":",2).map{|x| x.chomp} info[k] = v } info }, "keys" => lambda{|r| if r.is_a?(Array) r else r.split(" ") end }, "hgetall" => lambda{|r| Hash[*r] } }
- ALIASES =
{ "flush_db" => "flushdb", "flush_all" => "flushall", "last_save" => "lastsave", "key?" => "exists", "delete" => "del", "randkey" => "randomkey", "list_length" => "llen", "push_tail" => "rpush", "push_head" => "lpush", "pop_tail" => "rpop", "pop_head" => "lpop", "list_set" => "lset", "list_range" => "lrange", "list_trim" => "ltrim", "list_index" => "lindex", "list_rm" => "lrem", "set_add" => "sadd", "set_delete" => "srem", "set_count" => "scard", "set_member?" => "sismember", "set_members" => "smembers", "set_intersect" => "sinter", "set_intersect_store" => "sinterstore", "set_inter_store" => "sinterstore", "set_union" => "sunion", "set_union_store" => "sunionstore", "set_diff" => "sdiff", "set_diff_store" => "sdiffstore", "set_move" => "smove", "set_unless_exists" => "setnx", "rename_unless_exists" => "renamenx", "type?" => "type", "zset_add" => "zadd", "zset_count" => "zcard", "zset_range_by_score" => "zrangebyscore", "zset_reverse_range" => "zrevrange", "zset_range" => "zrange", "zset_delete" => "zrem", "zset_score" => "zscore", "zset_incr_by" => "zincrby", "zset_increment_by" => "zincrby" }
- DISABLED_COMMANDS =
{ "monitor" => true, "sync" => true }
- BLOCKING_COMMANDS =
{ "blpop" => true, "brpop" => true }
Instance Method Summary collapse
- #[](key) ⇒ Object
- #[]=(key, value) ⇒ Object
-
#call_command(argv) ⇒ Object
Wrap raw_call_command to handle reconnection on socket error.
- #connect_to(host, port) ⇒ Object
- #connect_to_server ⇒ Object
- #decr(key, decrement = nil) ⇒ Object
- #exec ⇒ Object
- #get(key) ⇒ Object
- #get_size(string) ⇒ Object
- #incr(key, increment = nil) ⇒ Object
-
#initialize(options = {}) ⇒ Client
constructor
A new instance of Client.
-
#mapped_mget(*keys) ⇒ Object
Similar to memcache.rb’s #get_multi, returns a hash mapping keys to values.
- #mapped_mset(hash) ⇒ Object
- #mapped_msetnx(hash) ⇒ Object
- #maybe_lock(&block) ⇒ Object
- #method_missing(*argv) ⇒ Object
- #mset(*args) ⇒ Object
- #msetnx(*args) ⇒ Object
- #multi(&block) ⇒ Object
- #pipelined {|pipeline| ... } ⇒ Object
- #process_command(command, argvv) ⇒ Object
- #quit ⇒ Object
- #raw_call_command(argvp) ⇒ Object
- #read_reply ⇒ Object
- #select(*args) ⇒ Object
- #server ⇒ Object
- #set(key, value, ttl = nil) ⇒ Object
- #set_with_expire(key, value, ttl) ⇒ Object
- #sort(key, options = {}) ⇒ Object
- #subscribe(*classes) {|sub| ... } ⇒ Object
- #to_s ⇒ Object
-
#type(key) ⇒ Object
Ruby defines a now deprecated type method so we need to override it here since it will never hit method_missing.
Constructor Details
#initialize(options = {}) ⇒ Client
Returns a new instance of Client.
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# File 'lib/redis/client.rb', line 145 def initialize( = {}) @host = [:host] || '127.0.0.1' @port = ([:port] || 6379).to_i @db = ([:db] || 0).to_i @timeout = ([:timeout] || 5).to_i @password = [:password] @logger = [:logger] @thread_safe = [:thread_safe] @binary_keys = [:binary_keys] @mutex = Mutex.new if @thread_safe @sock = nil @pubsub = false log(self) end |
Dynamic Method Handling
This class handles dynamic methods through the method_missing method
#method_missing(*argv) ⇒ Object
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# File 'lib/redis/client.rb', line 391 def method_missing(*argv) call_command(argv) end |
Instance Method Details
#[](key) ⇒ Object
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# File 'lib/redis/client.rb', line 169 def [](key) get(key) end |
#[]=(key, value) ⇒ Object
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# File 'lib/redis/client.rb', line 173 def []=(key,value) set(key, value) end |
#call_command(argv) ⇒ Object
Wrap raw_call_command to handle reconnection on socket error. We try to reconnect just one time, otherwise let the error araise.
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# File 'lib/redis/client.rb', line 337 def call_command(argv) log(argv.inspect, :debug) connect_to_server unless connected? begin raw_call_command(argv.dup) rescue Errno::ECONNRESET, Errno::EPIPE, Errno::ECONNABORTED if reconnect raw_call_command(argv.dup) else raise Errno::ECONNRESET end end end |
#connect_to(host, port) ⇒ Object
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# File 'lib/redis/client.rb', line 357 def connect_to(host, port) # We support connect_to() timeout only if system_timer is availabe # or if we are running against Ruby >= 1.9 # Timeout reading from the socket instead will be supported anyway. if @timeout != 0 and Timer begin @sock = TCPSocket.new(host, port) rescue Timeout::Error @sock = nil raise Timeout::Error, "Timeout connecting to the server" end else @sock = TCPSocket.new(host, port) end @sock.setsockopt Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1 # If the timeout is set we set the low level socket options in order # to make sure a blocking read will return after the specified number # of seconds. This hack is from memcached ruby client. set_socket_timeout!(@timeout) if @timeout rescue Errno::ECONNREFUSED raise Errno::ECONNREFUSED, "Unable to connect to Redis on #{host}:#{port}" end |
#connect_to_server ⇒ Object
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# File 'lib/redis/client.rb', line 384 def connect_to_server connect_to(@host, @port) call_command([:auth, @password]) if @password call_command([:select, @db]) if @db != 0 @sock end |
#decr(key, decrement = nil) ⇒ Object
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# File 'lib/redis/client.rb', line 253 def decr(key, decrement = nil) if decrement deprecated("decr with a decrement", :decrby, caller[0]) decrby(key, decrement) else call_command([:decr, key]) end end |
#exec ⇒ Object
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# File 'lib/redis/client.rb', line 280 def exec # Need to override Kernel#exec. call_command([:exec]) end |
#get(key) ⇒ Object
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# File 'lib/redis/client.rb', line 177 def get(key) call_command([:get, key]) end |
#get_size(string) ⇒ Object
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# File 'lib/redis/client.rb', line 490 def get_size(string) string.bytesize end |
#incr(key, increment = nil) ⇒ Object
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# File 'lib/redis/client.rb', line 244 def incr(key, increment = nil) if increment deprecated("incr with an increment", :incrby, caller[0]) incrby(key, increment) else call_command([:incr, key]) end end |
#mapped_mget(*keys) ⇒ Object
Similar to memcache.rb’s #get_multi, returns a hash mapping keys to values.
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# File 'lib/redis/client.rb', line 224 def mapped_mget(*keys) result = {} mget(*keys).each do |value| key = keys.shift result.merge!(key => value) unless value.nil? end result end |
#mapped_mset(hash) ⇒ Object
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# File 'lib/redis/client.rb', line 205 def mapped_mset(hash) mset(*hash.to_a.flatten) end |
#mapped_msetnx(hash) ⇒ Object
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# File 'lib/redis/client.rb', line 218 def mapped_msetnx(hash) msetnx(*hash.to_a.flatten) end |
#maybe_lock(&block) ⇒ Object
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# File 'lib/redis/client.rb', line 459 def maybe_lock(&block) if @thread_safe @mutex.synchronize(&block) else block.call end end |
#mset(*args) ⇒ Object
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# File 'lib/redis/client.rb', line 196 def mset(*args) if args.size == 1 deprecated("mset with a hash", :mapped_mset, caller[0]) mapped_mset(args[0]) else call_command(args.unshift(:mset)) end end |
#msetnx(*args) ⇒ Object
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# File 'lib/redis/client.rb', line 209 def msetnx(*args) if args.size == 1 deprecated("msetnx with a hash", :mapped_msetnx, caller[0]) mapped_msetnx(args[0]) else call_command(args.unshift(:msetnx)) end end |
#multi(&block) ⇒ Object
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# File 'lib/redis/client.rb', line 285 def multi(&block) result = call_command [:multi] return result unless block_given? begin yield(self) exec rescue Exception => e discard raise e end end |
#pipelined {|pipeline| ... } ⇒ Object
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# File 'lib/redis/client.rb', line 273 def pipelined(&block) Redis.deprecate("Calling pipelined commands on the yielded object will be deprecated in 2.0", caller[0]) pipeline = Pipeline.new self yield pipeline pipeline.execute end |
#process_command(command, argvv) ⇒ Object
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# File 'lib/redis/client.rb', line 451 def process_command(command, argvv) @sock.write(command) argvv.map do |argv| processor = REPLY_PROCESSOR[argv[0].to_s] processor ? processor.call(read_reply) : read_reply end end |
#quit ⇒ Object
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# File 'lib/redis/client.rb', line 268 def quit call_command(['quit']) rescue Errno::ECONNRESET end |
#raw_call_command(argvp) ⇒ Object
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# File 'lib/redis/client.rb', line 395 def raw_call_command(argvp) if argvp[0].is_a?(Array) argvv = argvp pipeline = true else argvv = [argvp] pipeline = false end if @binary_keys or pipeline or MULTI_BULK_COMMANDS[argvv[0][0].to_s] command = "" argvv.each do |argv| command << "*#{argv.size}\r\n" argv.each{|a| a = a.to_s command << "$#{get_size(a)}\r\n" command << a command << "\r\n" } end else command = "" argvv.each do |argv| bulk = nil argv[0] = argv[0].to_s if ALIASES[argv[0]] deprecated(argv[0], ALIASES[argv[0]], caller[4]) argv[0] = ALIASES[argv[0]] end raise "#{argv[0]} command is disabled" if DISABLED_COMMANDS[argv[0]] if BULK_COMMANDS[argv[0]] and argv.length > 1 bulk = argv[-1].to_s argv[-1] = get_size(bulk) end command << "#{argv.join(' ')}\r\n" command << "#{bulk}\r\n" if bulk end end # When in Pub/Sub mode we don't read replies synchronously. if @pubsub @sock.write(command) return true end # The normal command execution is reading and processing the reply. results = maybe_lock do begin set_socket_timeout!(0) if requires_timeout_reset?(argvv[0][0].to_s) process_command(command, argvv) ensure set_socket_timeout!(@timeout) if requires_timeout_reset?(argvv[0][0].to_s) end end return pipeline ? results : results[0] end |
#read_reply ⇒ Object
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# File 'lib/redis/client.rb', line 467 def read_reply # We read the first byte using read() mainly because gets() is # immune to raw socket timeouts. begin reply_type = @sock.read(1) rescue Errno::EAGAIN # We want to make sure it reconnects on the next command after the # timeout. Otherwise the server may reply in the meantime leaving # the protocol in a desync status. disconnect raise Errno::EAGAIN, "Timeout reading from the socket" end raise Errno::ECONNRESET, "Connection lost" unless reply_type format_reply(reply_type, @sock.gets) end |
#select(*args) ⇒ Object
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# File 'lib/redis/client.rb', line 165 def select(*args) raise "SELECT not allowed, use the :db option when creating the object" end |
#server ⇒ Object
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# File 'lib/redis/client.rb', line 353 def server "#{@host}:#{@port}" end |
#set(key, value, ttl = nil) ⇒ Object
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# File 'lib/redis/client.rb', line 181 def set(key, value, ttl = nil) if ttl deprecated("set with an expire", :set_with_expire, caller[0]) set_with_expire(key, value, ttl) else call_command([:set, key, value]) end end |
#set_with_expire(key, value, ttl) ⇒ Object
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# File 'lib/redis/client.rb', line 190 def set_with_expire(key, value, ttl) Redis.deprecate "Using a non-atomic set with expire. Use setex if your Redis version allows it.", caller[0] set(key, value) expire(key, ttl) end |
#sort(key, options = {}) ⇒ Object
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# File 'lib/redis/client.rb', line 233 def sort(key, = {}) cmd = [] cmd << "SORT #{key}" cmd << "BY #{[:by]}" if [:by] cmd << "GET #{[[:get]].flatten * ' GET '}" if [:get] cmd << "#{[:order]}" if [:order] cmd << "LIMIT #{[:limit].join(' ')}" if [:limit] cmd << "STORE #{[:store]}" if [:store] call_command(cmd) end |
#subscribe(*classes) {|sub| ... } ⇒ Object
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# File 'lib/redis/client.rb', line 299 def subscribe(*classes) # Top-level `subscribe` MUST be called with a block, # nested `subscribe` MUST NOT be called with a block if !@pubsub && !block_given? raise "Top-level subscribe requires a block" elsif @pubsub == true && block_given? raise "Nested subscribe does not take a block" elsif @pubsub # If we're already pubsub'ing, just subscribe us to some more classes call_command [:subscribe,*classes] return true end @pubsub = true call_command [:subscribe,*classes] sub = Subscription.new yield(sub) begin while true type, *reply = read_reply # type, [class,data] case type when 'subscribe','unsubscribe' sub.send(type) && sub.send(type).call(reply[0],reply[1]) when 'message' sub.send(type) && sub.send(type).call(reply[0],reply[1]) end break if type == 'unsubscribe' && reply[1] == 0 end rescue RuntimeError call_command [:unsubscribe] raise ensure @pubsub = false end end |
#to_s ⇒ Object
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# File 'lib/redis/client.rb', line 161 def to_s "Redis Client connected to #{server} against DB #{@db}" end |
#type(key) ⇒ Object
Ruby defines a now deprecated type method so we need to override it here since it will never hit method_missing
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# File 'lib/redis/client.rb', line 264 def type(key) call_command(['type', key]) end |