/usr/lib/ruby/vendor_ruby/em-hiredis/base_client.rb is in ruby-em-hiredis 0.3.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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module EventMachine::Hiredis
# Emits the following events
#
# * :connected - on successful connection or reconnection
# * :reconnected - on successful reconnection
# * :disconnected - no longer connected, when previously in connected state
# * :reconnect_failed(failure_number) - a reconnect attempt failed
# This event is passed number of failures so far (1,2,3...)
# * :monitor
#
class BaseClient
include EventEmitter
include EM::Deferrable
attr_reader :host, :port, :password, :db
def initialize(host = 'localhost', port = 6379, password = nil, db = nil)
@host, @port, @password, @db = host, port, password, db
@defs = []
@command_queue = []
@reconnect_failed_count = 0
@reconnect_timer = nil
@failed = false
self.on(:failed) {
@failed = true
@command_queue.each do |df, _, _|
df.fail(Error.new("Redis connection in failed state"))
end
@command_queue = []
}
end
# Configure the redis connection to use
#
# In usual operation, the uri should be passed to initialize. This method
# is useful for example when failing over to a slave connection at runtime
#
def configure(uri_string)
uri = URI(uri_string)
if uri.scheme == "unix"
@host = uri.path
@port = nil
else
@host = uri.host
@port = uri.port
@password = uri.password
path = uri.path[1..-1]
@db = path.to_i # Empty path => 0
end
end
# Disconnect then reconnect the redis connection.
#
# Pass optional uri - e.g. to connect to a different redis server.
# Any pending redis commands will be failed, but during the reconnection
# new commands will be queued and sent after connected.
#
def reconnect!(new_uri = nil)
@connection.close_connection
configure(new_uri) if new_uri
@auto_reconnect = true
EM.next_tick { reconnect_connection }
end
def connect
@auto_reconnect = true
@connection = EM.connect(@host, @port, Connection, @host, @port)
@connection.on(:closed) do
if @connected
@defs.each { |d| d.fail(Error.new("Redis disconnected")) }
@defs = []
@deferred_status = nil
@connected = false
if @auto_reconnect
# Next tick avoids reconnecting after for example EM.stop
EM.next_tick { reconnect }
end
emit(:disconnected)
EM::Hiredis.logger.info("#{@connection} Disconnected")
else
if @auto_reconnect
@reconnect_failed_count += 1
@reconnect_timer = EM.add_timer(EM::Hiredis.reconnect_timeout) {
@reconnect_timer = nil
reconnect
}
emit(:reconnect_failed, @reconnect_failed_count)
EM::Hiredis.logger.info("#{@connection} Reconnect failed")
if @reconnect_failed_count >= 4
emit(:failed)
self.fail(Error.new("Could not connect after 4 attempts"))
end
end
end
end
@connection.on(:connected) do
@connected = true
@reconnect_failed_count = 0
@failed = false
select(@db) unless @db == 0
auth(@password) if @password
@command_queue.each do |df, command, args|
@connection.send_command(command, args)
@defs.push(df)
end
@command_queue = []
emit(:connected)
EM::Hiredis.logger.info("#{@connection} Connected")
succeed
if @reconnecting
@reconnecting = false
emit(:reconnected)
end
end
@connection.on(:message) do |reply|
if RuntimeError === reply
raise "Replies out of sync: #{reply.inspect}" if @defs.empty?
deferred = @defs.shift
error = RedisError.new(reply.message)
error.redis_error = reply
deferred.fail(error) if deferred
else
handle_reply(reply)
end
end
@connected = false
@reconnecting = false
return self
end
# Indicates that commands have been sent to redis but a reply has not yet
# been received
#
# This can be useful for example to avoid stopping the
# eventmachine reactor while there are outstanding commands
#
def pending_commands?
@connected && @defs.size > 0
end
def connected?
@connected
end
def select(db, &blk)
@db = db
method_missing(:select, db, &blk)
end
def auth(password, &blk)
@password = password
method_missing(:auth, password, &blk)
end
def close_connection
EM.cancel_timer(@reconnect_timer) if @reconnect_timer
@auto_reconnect = false
@connection.close_connection_after_writing
end
# Note: This method doesn't disconnect if already connected. You probably
# want to use `reconnect!`
def reconnect_connection
@auto_reconnect = true
EM.cancel_timer(@reconnect_timer) if @reconnect_timer
reconnect
end
private
def method_missing(sym, *args)
deferred = EM::DefaultDeferrable.new
# Shortcut for defining the callback case with just a block
deferred.callback { |result| yield(result) } if block_given?
if @connected
@connection.send_command(sym, args)
@defs.push(deferred)
elsif @failed
deferred.fail(Error.new("Redis connection in failed state"))
else
@command_queue << [deferred, sym, args]
end
deferred
end
def reconnect
@reconnecting = true
@connection.reconnect @host, @port
EM::Hiredis.logger.info("#{@connection} Reconnecting")
end
def handle_reply(reply)
if @defs.empty?
if @monitoring
emit(:monitor, reply)
else
raise "Replies out of sync: #{reply.inspect}"
end
else
deferred = @defs.shift
deferred.succeed(reply) if deferred
end
end
end
end
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