# method_missing instead.
require 'socket'
+require 'set'
+
+begin
+ if (RUBY_VERSION >= '1.9')
+ require 'timeout'
+ RedisTimer = Timeout
+ else
+ require 'system_timer'
+ RedisTimer = SystemTimer
+ end
+rescue LoadError
+ RedisTimer = nil
+end
class RedisClient
BulkCommands = {
"echo"=>true, "getset"=>true, "smove"=>true
}
+ ConvertToBool = lambda{|r| r == 0 ? false : r}
+ ConvertToSet = lambda{|r| Set.new(r)}
+
+ ReplyProcessor = {
+ "exists" => ConvertToBool,
+ "sismember"=> ConvertToBool,
+ "sadd"=> ConvertToBool,
+ "srem"=> ConvertToBool,
+ "smove"=> ConvertToBool,
+ "move"=> ConvertToBool,
+ "setnx"=> ConvertToBool,
+ "del"=> ConvertToBool,
+ "renamenx"=> ConvertToBool,
+ "expire"=> ConvertToBool,
+ "smembers" => ConvertToSet,
+ "sinter" => ConvertToSet,
+ "sunion" => ConvertToSet,
+ "sdiff" => ConvertToSet,
+ "keys" => lambda{|r| r.split(" ")},
+ "info" => lambda{|r|
+ info = {}
+ r.each_line {|kv|
+ k,v = kv.split(":",2).map{|x| x.chomp}
+ info[k.to_sym] = v
+ }
+ info
+ }
+ }
+
+ Aliases = {
+ "flush_db" => "flushdb",
+ "flush_all" => "flushall",
+ "last_save" => "lastsave",
+ "key?" => "exists",
+ "delete" => "del",
+ "randkey" => "randomkey",
+ "list_length" => "llen",
+ "push_tail" => "rpush",
+ "push_head" => "lpush",
+ "pop_tail" => "rpop",
+ "pop_head" => "lpop",
+ "list_set" => "lset",
+ "list_range" => "lrange",
+ "list_trim" => "ltrim",
+ "list_index" => "lindex",
+ "list_rm" => "lrem",
+ "set_add" => "sadd",
+ "set_delete" => "srem",
+ "set_count" => "scard",
+ "set_member?" => "sismember",
+ "set_members" => "smembers",
+ "set_intersect" => "sinter",
+ "set_intersect_store" => "sinterstore",
+ "set_inter_store" => "sinterstore",
+ "set_union" => "sunion",
+ "set_union_store" => "sunionstore",
+ "set_diff" => "sdiff",
+ "set_diff_store" => "sdiffstore",
+ "set_move" => "smove",
+ "set_unless_exists" => "setnx",
+ "rename_unless_exists" => "renamenx"
+ }
+
def initialize(opts={})
- opts = {:host => 'localhost', :port => '6379', :db => 0}.merge(opts)
- @host = opts[:host]
- @port = opts[:port]
- @db = opts[:db]
- @sock = connect_to_server
+ @host = opts[:host] || '127.0.0.1'
+ @port = opts[:port] || 6379
+ @db = opts[:db] || 0
+ @timeout = opts[:timeout] || 0
+ connect_to_server
end
def to_s
end
def connect_to_server
- TCPSocket.new(@host, @port, 0)
+ @sock = connect_to(@host,@port,@timeout == 0 ? nil : @timeout)
+ call_command(["select",@db]) if @db != 0
+ end
+
+ def connect_to(host, port, timeout=nil)
+ # We support connect() timeout only if system_timer is availabe
+ # or if we are running against Ruby >= 1.9
+ # Timeout reading from the socket instead will be supported anyway.
+ if @timeout != 0 and RedisTimer
+ begin
+ sock = TCPSocket.new(host, port, 0)
+ rescue Timeout::Error
+ @sock = nil
+ raise Timeout::Error, "Timeout connecting to the server"
+ end
+ else
+ sock = TCPSocket.new(host, port, 0)
+ end
+
+ # If the timeout is set we set the low level socket options in order
+ # to make sure a blocking read will return after the specified number
+ # of seconds. This hack is from memcached ruby client.
+ if timeout
+ secs = Integer(timeout)
+ usecs = Integer((timeout - secs) * 1_000_000)
+ optval = [secs, usecs].pack("l_2")
+ sock.setsockopt Socket::SOL_SOCKET, Socket::SO_RCVTIMEO, optval
+ sock.setsockopt Socket::SOL_SOCKET, Socket::SO_SNDTIMEO, optval
+ end
+ sock
end
def method_missing(*argv)
end
def call_command(argv)
+ # this wrapper to raw_call_command handle reconnection on socket
+ # error. We try to reconnect just one time, otherwise let the error
+ # araise.
+ connect_to_server if !@sock
+ begin
+ raw_call_command(argv)
+ rescue Errno::ECONNRESET
+ @sock.close
+ connect_to_server
+ raw_call_command(argv)
+ end
+ end
+
+ def raw_call_command(argv)
bulk = nil
argv[0] = argv[0].to_s.downcase
+ argv[0] = Aliases[argv[0]] if Aliases[argv[0]]
if BulkCommands[argv[0]]
- bulk = argv[-1]
+ bulk = argv[-1].to_s
argv[-1] = bulk.length
end
@sock.write(argv.join(" ")+"\r\n")
@sock.write(bulk+"\r\n") if bulk
- read_reply
+
+ # Post process the reply if needed
+ processor = ReplyProcessor[argv[0]]
+ processor ? processor.call(read_reply) : read_reply
+ end
+
+ def select(*args)
+ raise "SELECT not allowed, use the :db option when creating the object"
+ end
+
+ def [](key)
+ get(key)
+ end
+
+ def []=(key,value)
+ set(key,value)
+ end
+
+ def sort(key, opts={})
+ cmd = []
+ cmd << "SORT #{key}"
+ cmd << "BY #{opts[:by]}" if opts[:by]
+ cmd << "GET #{[opts[:get]].flatten * ' GET '}" if opts[:get]
+ cmd << "#{opts[:order]}" if opts[:order]
+ cmd << "LIMIT #{opts[:limit].join(' ')}" if opts[:limit]
+ call_command(cmd)
+ end
+
+ def incr(key,increment=nil)
+ call_command(increment ? ["incrby",key,increment] : ["incr",key])
+ end
+
+ def decr(key,decrement=nil)
+ call_command(decrement ? ["decrby",key,decrement] : ["decr",key])
end
def read_reply
+ # We read the first byte using read() mainly because gets() is
+ # immune to raw socket timeouts.
+ begin
+ rtype = @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.
+ @sock = nil
+ raise Errno::EAGAIN, "Timeout reading from the socket"
+ end
+
+ raise Errno::ECONNRESET,"Connection lost" if !rtype
line = @sock.gets
- case line[0..0]
+ case rtype
when "-"
- raise line.strip
+ raise "-"+line.strip
when "+"
- line[1..-1].strip
+ line.strip
when ":"
- line[1..-1].to_i
+ line.to_i
when "$"
- bulklen = line[1..-1].to_i
+ bulklen = line.to_i
return nil if bulklen == -1
data = @sock.read(bulklen)
@sock.read(2) # CRLF
data
when "*"
- objects = line[1..-1].to_i
+ objects = line.to_i
return nil if bulklen == -1
res = []
objects.times {
res << read_reply
}
res
+ else
+ raise "Protocol error, got '#{rtype}' as initial reply byte"
end
end
end
projects / redis.git / blobdiff