Class: Redis::Client

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

Defined Under Namespace

Classes: Connector

Constant Summary

DEFAULTS =
{
  :url => lambda { ENV["REDIS_URL"] },
  :scheme => "redis",
  :host => "127.0.0.1",
  :port => 6379,
  :path => nil,
  :timeout => 5.0,
  :connect_timeout => 5.0,
  :password => nil,
  :db => 0,
  :driver => nil,
  :id => nil,
  :tcp_keepalive => 0,
  :reconnect_attempts => 1,
  :inherit_socket => false
}

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 73

def initialize(options = {})
  @options = _parse_options(options)
  @reconnect = true
  @logger = @options[:logger]
  @connection = nil
  @command_map = {}

  @pending_reads = 0

  if options.include?(:sentinels)
    @connector = Connector::Sentinel.new(@options)
  else
    @connector = Connector.new(@options)
  end
end

Instance Attribute Details

#command_mapObject (readonly)

Returns the value of attribute command_map



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# File 'lib/redis/client.rb', line 71

def command_map
  @command_map
end

#connectionObject (readonly)

Returns the value of attribute connection



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# File 'lib/redis/client.rb', line 70

def connection
  @connection
end

#loggerObject

Returns the value of attribute logger



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# File 'lib/redis/client.rb', line 69

def logger
  @logger
end

Instance Method Details

#call(command, &block) ⇒ Object



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# File 'lib/redis/client.rb', line 111

def call(command, &block)
  reply = process([command]) { read }
  raise reply if reply.is_a?(CommandError)

  if block
    block.call(reply)
  else
    reply
  end
end

#call_loop(command) ⇒ Object



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# File 'lib/redis/client.rb', line 122

def call_loop(command)
  error = nil

  result = without_socket_timeout do
    process([command]) do
      loop do
        reply = read
        if reply.is_a?(CommandError)
          error = reply
          break
        else
          yield reply
        end
      end
    end
  end

  # Raise error when previous block broke out of the loop.
  raise error if error

  # Result is set to the value that the provided block used to break.
  result
end

#call_pipeline(pipeline) ⇒ Object



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# File 'lib/redis/client.rb', line 146

def call_pipeline(pipeline)
  with_reconnect pipeline.with_reconnect? do
    begin
      pipeline.finish(call_pipelined(pipeline.commands)).tap do
        self.db = pipeline.db if pipeline.db
      end
    rescue ConnectionError => e
      return nil if pipeline.shutdown?
      # Assume the pipeline was sent in one piece, but execution of
      # SHUTDOWN caused none of the replies for commands that were executed
      # prior to it from coming back around.
      raise e
    end
  end
end

#call_pipelined(commands) ⇒ Object



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# File 'lib/redis/client.rb', line 162

def call_pipelined(commands)
  return [] if commands.empty?

  # The method #ensure_connected (called from #process) reconnects once on
  # I/O errors. To make an effort in making sure that commands are not
  # executed more than once, only allow reconnection before the first reply
  # has been read. When an error occurs after the first reply has been
  # read, retrying would re-execute the entire pipeline, thus re-issuing
  # already successfully executed commands. To circumvent this, don't retry
  # after the first reply has been read successfully.

  result = Array.new(commands.size)
  reconnect = @reconnect

  begin
    process(commands) do
      result[0] = read

      @reconnect = false

      (commands.size - 1).times do |i|
        result[i + 1] = read
      end
    end
  ensure
    @reconnect = reconnect
  end

  result
end

#call_with_timeout(command, timeout, &blk) ⇒ Object



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# File 'lib/redis/client.rb', line 193

def call_with_timeout(command, timeout, &blk)
  with_socket_timeout(timeout) do
    call(command, &blk)
  end
rescue ConnectionError
  retry
end

#call_without_timeout(command, &blk) ⇒ Object



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# File 'lib/redis/client.rb', line 201

def call_without_timeout(command, &blk)
  call_with_timeout(command, 0, &blk)
end

#connectObject



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# File 'lib/redis/client.rb', line 89

def connect
  @pid = Process.pid

  # Don't try to reconnect when the connection is fresh
  with_reconnect(false) do
    establish_connection
    call [:auth, password] if password
    call [:select, db] if db != 0
    @connector.check(self)
  end

  self
end

#connected?Boolean

Returns:

  • (Boolean)


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# File 'lib/redis/client.rb', line 222

def connected?
  !! (connection && connection.connected?)
end

#dbObject



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

def db
  @options[:db]
end

#db=(db) ⇒ Object



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# File 'lib/redis/client.rb', line 57

def db=(db)
  @options[:db] = db.to_i
end

#disconnectObject



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# File 'lib/redis/client.rb', line 226

def disconnect
  connection.disconnect if connected?
end

#driverObject



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# File 'lib/redis/client.rb', line 61

def driver
  @options[:driver]
end

#hostObject



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

def host
  @options[:host]
end

#idObject



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# File 'lib/redis/client.rb', line 103

def id
  @options[:id] || "redis://#{location}/#{db}"
end

#inherit_socket?Boolean

Returns:

  • (Boolean)


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# File 'lib/redis/client.rb', line 65

def inherit_socket?
  @options[:inherit_socket]
end

#ioObject



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# File 'lib/redis/client.rb', line 235

def io
  yield
rescue TimeoutError => e1
  # Add a message to the exception without destroying the original stack
  e2 = TimeoutError.new("Connection timed out")
  e2.set_backtrace(e1.backtrace)
  raise e2
rescue Errno::ECONNRESET, Errno::EPIPE, Errno::ECONNABORTED, Errno::EBADF, Errno::EINVAL => e
  raise ConnectionError, "Connection lost (%s)" % [e.class.name.split("::").last]
end

#locationObject



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# File 'lib/redis/client.rb', line 107

def location
  path || "#{host}:#{port}"
end

#optionsObject



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# File 'lib/redis/client.rb', line 25

def options
  Marshal.load(Marshal.dump(@options))
end

#passwordObject



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# File 'lib/redis/client.rb', line 49

def password
  @options[:password]
end

#pathObject



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

def path
  @options[:path]
end

#portObject



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# File 'lib/redis/client.rb', line 37

def port
  @options[:port]
end

#process(commands) ⇒ Object



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# File 'lib/redis/client.rb', line 205

def process(commands)
  logging(commands) do
    ensure_connected do
      commands.each do |command|
        if command_map[command.first]
          command = command.dup
          command[0] = command_map[command.first]
        end

        write(command)
      end

      yield if block_given?
    end
  end
end

#readObject



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# File 'lib/redis/client.rb', line 246

def read
  io do
    value = connection.read
    @pending_reads -= 1
    value
  end
end

#reconnectObject



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

def reconnect
  disconnect
  connect
end

#schemeObject



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

def scheme
  @options[:scheme]
end

#timeoutObject



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

def timeout
  @options[:timeout]
end

#with_reconnect(val = true) ⇒ Object



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# File 'lib/redis/client.rb', line 276

def with_reconnect(val=true)
  begin
    original, @reconnect = @reconnect, val
    yield
  ensure
    @reconnect = original
  end
end

#with_socket_timeout(timeout) ⇒ Object



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# File 'lib/redis/client.rb', line 261

def with_socket_timeout(timeout)
  connect unless connected?

  begin
    connection.timeout = timeout
    yield
  ensure
    connection.timeout = self.timeout if connected?
  end
end

#without_reconnect(&blk) ⇒ Object



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# File 'lib/redis/client.rb', line 285

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

#without_socket_timeout(&blk) ⇒ Object



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# File 'lib/redis/client.rb', line 272

def without_socket_timeout(&blk)
  with_socket_timeout(0, &blk)
end

#write(command) ⇒ Object



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# File 'lib/redis/client.rb', line 254

def write(command)
  io do
    @pending_reads += 1
    connection.write(command)
  end
end