Class: Redis::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/redis/client.rb

Direct Known Subclasses

ThreadSafe

Defined Under Namespace

Classes: ThreadSafe

Constant Summary collapse

MINUS = 
"-".freeze
PLUS = 
"+".freeze
COLON = 
":".freeze
DOLLAR = 
"$".freeze
ASTERISK = 
"*".freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Client

Returns a new instance of Client.



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# File 'lib/redis/client.rb', line 12

def initialize(options = {})
  @host = options[:host] || "127.0.0.1"
  @port = (options[:port] || 6379).to_i
  @db = (options[:db] || 0).to_i
  @timeout = (options[:timeout] || 5).to_i
  @password = options[:password]
  @logger = options[:logger]
  @sock = nil
end

Instance Attribute Details

#db ⇒ Object

Returns the value of attribute db.



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# File 'lib/redis/client.rb', line 9

def db
  @db
end

#host ⇒ Object

Returns the value of attribute host.



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# File 'lib/redis/client.rb', line 9

def host
  @host
end

#logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/redis/client.rb', line 9

def logger
  @logger
end

#password ⇒ Object

Returns the value of attribute password.



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# File 'lib/redis/client.rb', line 9

def password
  @password
end

#port ⇒ Object

Returns the value of attribute port.



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# File 'lib/redis/client.rb', line 9

def port
  @port
end

#timeout ⇒ Object

Returns the value of attribute timeout.



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

def timeout
  @timeout
end

Instance Method Details

#call(*args) ⇒ Object 



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# File 'lib/redis/client.rb', line 33

def call(*args)
  process(args) do
    read
  end
end

#call_loop(*args) ⇒ Object 



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# File 'lib/redis/client.rb', line 39

def call_loop(*args)
  process(args) do
    loop { yield(read) }
  end
end

#call_pipelined(commands) ⇒ Object 



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# File 'lib/redis/client.rb', line 45

def call_pipelined(commands)
  process(*commands) do
    Array.new(commands.size) { read }
  end
end

#call_without_timeout(*args) ⇒ Object 



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# File 'lib/redis/client.rb', line 51

def call_without_timeout(*args)
  without_socket_timeout do
    call(*args)
  end
rescue Errno::ECONNRESET
  retry
end

#connect ⇒ Object 



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# File 'lib/redis/client.rb', line 22

def connect
  connect_to(@host, @port)
  call(:auth, @password) if @password
  call(:select, @db) if @db != 0
  @sock
end

#connected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/redis/client.rb', line 68

def connected?
  !! @sock
end

#disconnect ⇒ Object 



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

def disconnect
  return unless connected?

  begin
    @sock.close
  rescue
  ensure
    @sock = nil
  end
end

#id ⇒ Object 



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

def id
  "redis://#{host}:#{port}/#{db}"
end

#process(*commands) ⇒ Object 



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# File 'lib/redis/client.rb', line 59

def process(*commands)
  logging(commands) do
    ensure_connected do
      @sock.write(join_commands(commands))
      yield if block_given?
    end
  end
end

#read ⇒ Object

Raises:

  • (Errno::ECONNRESET) 


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# File 'lib/redis/client.rb', line 88

def read
  # 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

#reconnect ⇒ Object 



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# File 'lib/redis/client.rb', line 83

def reconnect
  disconnect
  connect
end

#without_socket_timeout ⇒ Object 



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# File 'lib/redis/client.rb', line 108

def without_socket_timeout
  connect unless connected?

  begin
    self.timeout = 0
    yield
  ensure
    self.timeout = @timeout if connected?
  end
end