/
socket_cache.rb
142 lines (120 loc) · 3.53 KB
/
socket_cache.rb
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
#
# Fluentd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require 'fluent/plugin/output'
module Fluent::Plugin
class ForwardOutput < Output
class SocketCache
TimedSocket = Struct.new(:timeout, :key, :sock)
def initialize(timeout, log)
@log = log
@timeout = timeout
@available_sockets = Hash.new { |obj, k| obj[k] = [] }
@inflight_sockets = {}
@inactive_sockets = []
@mutex = Mutex.new
end
def checkout_or(key)
@mutex.synchronize do
tsock = pick_socket(key)
if tsock
tsock.sock
else
sock = yield
new_tsock = TimedSocket.new(timeout, key, sock)
@log.debug("connect new socket #{new_tsock}")
@inflight_sockets[sock] = new_tsock
new_tsock.sock
end
end
end
def checkin(sock)
@mutex.synchronize do
if (s = @inflight_sockets.delete(sock))
s.timeout = timeout
@available_sockets[s.key] << s
else
@log.debug("there is no socket #{sock}")
end
end
end
def revoke(sock)
@mutex.synchronize do
if (s = @inflight_sockets.delete(sock))
@inactive_sockets << s
else
@log.debug("there is no socket #{sock}")
end
end
end
def purge_obsolete_socks
sockets = []
@mutex.synchronize do
# don't touch @inflight_sockets
@available_sockets.each do |_, socks|
socks.each do |sock|
if expired_socket?(sock)
sockets << sock
socks.delete(sock)
end
end
end
# reuse same object (@available_sockets)
@available_sockets.reject! { |_, v| v.empty? }
sockets += @inactive_sockets
@inactive_sockets.clear
end
sockets.each do |s|
s.sock.close rescue nil
end
end
def clear
sockets = []
@mutex.synchronize do
sockets += @available_sockets.values.flat_map { |v| v }
sockets += @inflight_sockets.values
sockets += @inactive_sockets
@available_sockets.clear
@inflight_sockets.clear
@inactive_sockets.clear
end
sockets.each do |s|
s.sock.close rescue nil
end
end
private
# this method is not thread safe
def pick_socket(key)
if @available_sockets[key].empty?
return nil
end
t = Time.now
if (s = @available_sockets[key].find { |sock| !expired_socket?(sock, time: t) })
@inflight_sockets[s.sock] = @available_sockets[key].delete(s)
s.timeout = timeout
s
else
nil
end
end
def timeout
@timeout && Time.now + @timeout
end
def expired_socket?(sock, time: Time.now)
sock.timeout ? sock.timeout < time : false
end
end
end
end