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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
#
# 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 'monitor'
require 'logger'
require 'sasl'
module Qpid
FIRST_SEG = 0x08
LAST_SEG = 0x04
FIRST_FRM = 0x02
LAST_FRM = 0x01
class << self
attr_accessor :raw_logger, :frm_logger
end
def self.packed_size(format)
# FIXME: This is a total copout to simulate Python's
# struct.calcsize
([0]*256).pack(format).size
end
class Frame
attr_reader :payload, :track, :flags, :type, :channel
# HEADER = "!2BHxBH4x"
# Python Meaning Ruby
# ! big endian (implied by format char)
# 2B 2 uchar C2
# H unsigned short n
# x pad byte x
# B uchar C
# H unsigned short n
# 4x pad byte x4
HEADER = "C2nxCnx4"
HEADER_SIZE = Qpid::packed_size(HEADER)
MAX_PAYLOAD = 65535 - HEADER_SIZE
def initialize(flags, type, track, channel, payload)
if payload.size > MAX_PAYLOAD
raise ArgumentError, "max payload size exceeded: #{payload.size}"
end
@flags = flags
@type = type
@track = track
@channel = channel
@payload = payload
end
def first_segment? ; FIRST_SEG & @flags > 0 ; end
def last_segment? ; LAST_SEG & @flags > 0 ; end
def first_frame? ; FIRST_FRM & @flags > 0 ; end
def last_frame? ; LAST_FRM & @flags > 0 ; end
def to_s
fs = first_segment? ? 'S' : '.'
ls = last_segment? ? 's' : '.'
ff = first_frame? ? 'F' : '.'
lf = last_frame? ? 'f' : '.'
return "%s%s%s%s %s %s %s %s" % [fs, ls, ff, lf,
@type,
@track,
@channel,
@payload.inspect]
end
end
class FramingError < Exception ; end
class Closed < Exception ; end
class Framer
include Packer
# Python: "!4s4B"
HEADER = "a4C4"
HEADER_SIZE = 8
def raw
Qpid::raw_logger
end
def frm
Qpid::frm_logger
end
def initialize(sock)
@sock = sock
@sock.extend(MonitorMixin)
@tx_buf = ""
@rx_buf = ""
@security_layer_tx = nil
@security_layer_rx = nil
@maxbufsize = 65535
end
attr_reader :sock
attr_accessor :security_layer_tx, :security_layer_rx
def aborted? ; false ; end
def write(buf)
@tx_buf += buf
end
def flush
@sock.synchronize do
if @security_layer_tx
cipher_buf = Sasl.encode(@security_layer_tx, @tx_buf)
_write(cipher_buf)
else
_write(@tx_buf)
end
@tx_buf = ""
frm.debug("FLUSHED") if frm
end
rescue
@sock.close unless @sock.closed?
end
def _write(buf)
while buf && buf.size > 0
# FIXME: Catch errors
n = @sock.write(buf)
raw.debug("SENT #{buf[0, n].inspect}") if raw
buf[0,n] = ""
@sock.flush
end
end
def read(n)
while @rx_buf.size < n
begin
s = @sock.recv(@maxbufsize)
if @security_layer_rx
s = Sasl.decode(@security_layer_rx, s)
end
rescue IOError => e
raise e if @rx_buf != ""
@sock.close unless @sock.closed?
raise Closed
end
# FIXME: Catch errors
if s.nil? or s.size == 0
@sock.close unless @sock.closed?
raise Closed
end
@rx_buf += s
raw.debug("RECV #{n}/#{@rx_buf.size} #{s.inspect}") if raw
end
data = @rx_buf[0, n]
@rx_buf = @rx_buf[n, @rx_buf.size - n]
return data
end
def read_header
unpack(Framer::HEADER, Framer::HEADER_SIZE)
end
def write_header(major, minor)
@sock.synchronize do
pack(Framer::HEADER, "AMQP", 1, 1, major, minor)
flush()
end
end
def write_frame(frame)
@sock.synchronize do
size = frame.payload.size + Frame::HEADER_SIZE
track = frame.track & 0x0F
pack(Frame::HEADER, frame.flags, frame.type, size, track, frame.channel)
write(frame.payload)
if frame.last_segment? and frame.last_frame?
flush()
frm.debug("SENT #{frame}") if frm
end
end
end
def read_frame
flags, type, size, track, channel = unpack(Frame::HEADER, Frame::HEADER_SIZE)
raise FramingError if (flags & 0xF0 > 0)
payload = read(size - Frame::HEADER_SIZE)
frame = Frame.new(flags, type, track, channel, payload)
frm.debug("RECV #{frame}") if frm
return frame
end
end
end
|
