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
|
--
-- Licensed to the Apache Software Foundation (ASF) under one
-- or more contributor license agreements. See the NOTICE file
-- distributed with this work for additional information
-- regarding copyright ownership. The ASF licenses this file
-- to you 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 'TTransport'
require 'libluabpack'
TFramedTransport = TTransportBase:new{
__type = 'TFramedTransport',
doRead = true,
doWrite = true,
wBuf = '',
rBuf = ''
}
function TFramedTransport:new(obj)
if ttype(obj) ~= 'table' then
error(ttype(self) .. 'must be initialized with a table')
end
-- Ensure a transport is provided
if not obj.trans then
error('You must provide ' .. ttype(self) .. ' with a trans')
end
return TTransportBase.new(self, obj)
end
function TFramedTransport:isOpen()
return self.trans:isOpen()
end
function TFramedTransport:open()
return self.trans:open()
end
function TFramedTransport:close()
return self.trans:close()
end
function TFramedTransport:read(len)
if string.len(self.rBuf) == 0 then
self:__readFrame()
end
if self.doRead == false then
return self.trans:read(len)
end
if len > string.len(self.rBuf) then
local val = self.rBuf
self.rBuf = ''
return val
end
local val = string.sub(self.rBuf, 0, len)
self.rBuf = string.sub(self.rBuf, len+1)
return val
end
function TFramedTransport:__readFrame()
local buf = self.trans:readAll(4)
local frame_len = libluabpack.bunpack('i', buf)
self.rBuf = self.trans:readAll(frame_len)
end
function TFramedTransport:write(buf, len)
if self.doWrite == false then
return self.trans:write(buf, len)
end
if len and len < string.len(buf) then
buf = string.sub(buf, 0, len)
end
self.wBuf = self.wBuf .. buf
end
function TFramedTransport:flush()
if self.doWrite == false then
return self.trans:flush()
end
-- If the write fails we still want wBuf to be clear
local tmp = self.wBuf
self.wBuf = ''
local frame_len_buf = libluabpack.bpack("i", string.len(tmp))
tmp = frame_len_buf .. tmp
self.trans:write(tmp)
self.trans:flush()
end
TFramedTransportFactory = TTransportFactoryBase:new{
__type = 'TFramedTransportFactory'
}
function TFramedTransportFactory:getTransport(trans)
if not trans then
terror(TProtocolException:new{
message = 'Must supply a transport to ' .. ttype(self)
})
end
return TFramedTransport:new{trans = trans}
end
|
