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



73
74
75
76
77
78
79
80
81
82
83
84
85
# File 'lib/redis/client.rb', line 73

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

  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



71
72
73
# File 'lib/redis/client.rb', line 71

def command_map
  @command_map
end

#connectionObject (readonly)

Returns the value of attribute connection



70
71
72
# File 'lib/redis/client.rb', line 70

def connection
  @connection
end

#loggerObject

Returns the value of attribute logger



69
70
71
# File 'lib/redis/client.rb', line 69

def logger
  @logger
end

Instance Method Details

#call(command, &block) ⇒ Object



109
110
111
112
113
114
115
116
117
118
# File 'lib/redis/client.rb', line 109

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



120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
# File 'lib/redis/client.rb', line 120

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



144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
# File 'lib/redis/client.rb', line 144

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



160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
# File 'lib/redis/client.rb', line 160

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



191
192
193
194
195
196
197
# File 'lib/redis/client.rb', line 191

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



199
200
201
# File 'lib/redis/client.rb', line 199

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

#connectObject



87
88
89
90
91
92
93
94
95
96
97
98
99
# File 'lib/redis/client.rb', line 87

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)


220
221
222
# File 'lib/redis/client.rb', line 220

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

#dbObject



53
54
55
# File 'lib/redis/client.rb', line 53

def db
  @options[:db]
end

#db=(db) ⇒ Object



57
58
59
# File 'lib/redis/client.rb', line 57

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

#disconnectObject



224
225
226
# File 'lib/redis/client.rb', line 224

def disconnect
  connection.disconnect if connected?
end

#driverObject



61
62
63
# File 'lib/redis/client.rb', line 61

def driver
  @options[:driver]
end

#hostObject



33
34
35
# File 'lib/redis/client.rb', line 33

def host
  @options[:host]
end

#idObject



101
102
103
# File 'lib/redis/client.rb', line 101

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

#inherit_socket?Boolean

Returns:

  • (Boolean)


65
66
67
# File 'lib/redis/client.rb', line 65

def inherit_socket?
  @options[:inherit_socket]
end

#ioObject



233
234
235
236
237
238
239
240
241
242
# File 'lib/redis/client.rb', line 233

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



105
106
107
# File 'lib/redis/client.rb', line 105

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

#optionsObject



25
26
27
# File 'lib/redis/client.rb', line 25

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

#passwordObject



49
50
51
# File 'lib/redis/client.rb', line 49

def password
  @options[:password]
end

#pathObject



41
42
43
# File 'lib/redis/client.rb', line 41

def path
  @options[:path]
end

#portObject



37
38
39
# File 'lib/redis/client.rb', line 37

def port
  @options[:port]
end

#process(commands) ⇒ Object



203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
# File 'lib/redis/client.rb', line 203

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



244
245
246
247
248
# File 'lib/redis/client.rb', line 244

def read
  io do
    connection.read
  end
end

#reconnectObject



228
229
230
231
# File 'lib/redis/client.rb', line 228

def reconnect
  disconnect
  connect
end

#schemeObject



29
30
31
# File 'lib/redis/client.rb', line 29

def scheme
  @options[:scheme]
end

#timeoutObject



45
46
47
# File 'lib/redis/client.rb', line 45

def timeout
  @options[:timeout]
end

#with_reconnect(val = true) ⇒ Object



271
272
273
274
275
276
277
278
# File 'lib/redis/client.rb', line 271

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

#with_socket_timeout(timeout) ⇒ Object



256
257
258
259
260
261
262
263
264
265
# File 'lib/redis/client.rb', line 256

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



280
281
282
# File 'lib/redis/client.rb', line 280

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

#without_socket_timeout(&blk) ⇒ Object



267
268
269
# File 'lib/redis/client.rb', line 267

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

#write(command) ⇒ Object



250
251
252
253
254
# File 'lib/redis/client.rb', line 250

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