Class: Redis::Client

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

Constant Summary collapse

DEFAULTS = 
{
  :url => lambda { ENV["REDIS_URL"] },
  :scheme => "redis",
  :host => "127.0.0.1",
  :port => 6379,
  :path => nil,
  :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 72

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

Instance Attribute Details

#command_map ⇒ Object (readonly)

Returns the value of attribute command_map.



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

def command_map
  @command_map
end

#connection ⇒ Object (readonly)

Returns the value of attribute connection.



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

def connection
  @connection
end

#logger ⇒ Object

Returns the value of attribute logger.



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

def logger
  @logger
end

Instance Method Details

#call(command, &block) ⇒ Object 



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

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 112

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 136

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 152

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 183

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 191

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

#connect ⇒ Object 



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# File 'lib/redis/client.rb', line 80

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
  end

  self
end

#connected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/redis/client.rb', line 212

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

#db ⇒ Object 



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# File 'lib/redis/client.rb', line 52

def db
  @options[:db]
end

#db=(db) ⇒ Object 



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# File 'lib/redis/client.rb', line 56

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

#disconnect ⇒ Object 



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# File 'lib/redis/client.rb', line 216

def disconnect
  connection.disconnect if connected?
end

#driver ⇒ Object 



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# File 'lib/redis/client.rb', line 60

def driver
  @options[:driver]
end

#host ⇒ Object 



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# File 'lib/redis/client.rb', line 32

def host
  @options[:host]
end

#id ⇒ Object 



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# File 'lib/redis/client.rb', line 93

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

#inherit_socket? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/redis/client.rb', line 64

def inherit_socket?
  @options[:inherit_socket]
end

#io ⇒ Object 



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# File 'lib/redis/client.rb', line 225

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

#location ⇒ Object 



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# File 'lib/redis/client.rb', line 97

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

#options ⇒ Object 



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# File 'lib/redis/client.rb', line 24

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

#password ⇒ Object 



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

def password
  @options[:password]
end

#path ⇒ Object 



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# File 'lib/redis/client.rb', line 40

def path
  @options[:path]
end

#port ⇒ Object 



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

def port
  @options[:port]
end

#process(commands) ⇒ Object 



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# File 'lib/redis/client.rb', line 195

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

#read ⇒ Object 



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# File 'lib/redis/client.rb', line 236

def read
  io do
    connection.read
  end
end

#reconnect ⇒ Object 



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# File 'lib/redis/client.rb', line 220

def reconnect
  disconnect
  connect
end

#scheme ⇒ Object 



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# File 'lib/redis/client.rb', line 28

def scheme
  @options[:scheme]
end

#timeout ⇒ Object 



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# File 'lib/redis/client.rb', line 44

def timeout
  @options[:timeout]
end

#with_reconnect(val = true) ⇒ Object 



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# File 'lib/redis/client.rb', line 263

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 248

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 272

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

#without_socket_timeout(&blk) ⇒ Object 



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# File 'lib/redis/client.rb', line 259

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

#write(command) ⇒ Object 



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# File 'lib/redis/client.rb', line 242

def write(command)
  io do
    connection.write(command)
  end
end