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
|
# This file is part of the ruby-dbus project
# Copyright (C) 2007 Arnaud Cornet and Paul van Tilburg
# Copyright (C) 2009-2014 Martin Vidner
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License, version 2.1 as published by the Free Software Foundation.
# See the file "COPYING" for the exact licensing terms.
require "fcntl"
require "socket"
module DBus
# Encapsulates a socket so that we can {#push} and {#pop} {Message}s.
class MessageQueue
# The socket that is used to connect with the bus.
attr_reader :socket
def initialize(address)
@address = address
@buffer = ""
@is_tcp = false
connect
end
# @param non_block [Boolean] if true, return nil instead of waiting
# @return [Message,nil] one message or nil if unavailable
# @raise EOFError
# @todo failure modes
def pop(non_block = false)
buffer_from_socket_nonblock
message = message_from_buffer_nonblock
unless non_block
# we can block
while message.nil?
r, _d, _d = IO.select([@socket])
if r && r[0] == @socket
buffer_from_socket_nonblock
message = message_from_buffer_nonblock
end
end
end
message
end
def push(message)
@socket.write(message.marshall)
end
alias << push
private
# Connect to the bus and initialize the connection.
def connect
addresses = @address.split ";"
# connect to first one that succeeds
worked = addresses.find do |a|
transport, keyvaluestring = a.split ":"
kv_list = keyvaluestring.split ","
kv_hash = {}
kv_list.each do |kv|
key, escaped_value = kv.split "="
value = escaped_value.gsub(/%(..)/) { |_m| [Regexp.last_match(1)].pack "H2" }
kv_hash[key] = value
end
case transport
when "unix"
connect_to_unix kv_hash
when "tcp"
connect_to_tcp kv_hash
when "launchd"
connect_to_launchd kv_hash
else
# ignore, report?
end
end
worked
# returns the address that worked or nil.
# how to report failure?
end
# Connect to a bus over tcp and initialize the connection.
def connect_to_tcp(params)
# check if the path is sufficient
if params.key?("host") && params.key?("port")
begin
# initialize the tcp socket
@socket = TCPSocket.new(params["host"], params["port"].to_i)
@socket.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
init_connection
@is_tcp = true
rescue Exception => e
puts "Oops:", e
puts "Error: Could not establish connection to: #{@path}, will now exit."
exit(1) # a little harsh
end
else
# Danger, Will Robinson: the specified "path" is not usable
puts "Error: supplied path: #{@path}, unusable! sorry."
end
end
# Connect to an abstract unix bus and initialize the connection.
def connect_to_unix(params)
@socket = Socket.new(Socket::Constants::PF_UNIX, Socket::Constants::SOCK_STREAM, 0)
@socket.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
if !params["abstract"].nil?
sockaddr = if HOST_END == LIL_END
"\1\0\0#{params["abstract"]}"
else
"\0\1\0#{params["abstract"]}"
end
elsif !params["path"].nil?
sockaddr = Socket.pack_sockaddr_un(params["path"])
end
@socket.connect(sockaddr)
init_connection
end
def connect_to_launchd(params)
socket_var = params["env"]
socket = `launchctl getenv #{socket_var}`.chomp
connect_to_unix "path" => socket
end
# Initialize the connection to the bus.
def init_connection
client = Client.new(@socket)
client.authenticate
end
public # FIXME: fix Main loop instead
# Get and remove one message from the buffer.
# @return [Message,nil] the message or nil if unavailable
def message_from_buffer_nonblock
return nil if @buffer.empty?
ret = nil
begin
ret, size = Message.new.unmarshall_buffer(@buffer)
@buffer.slice!(0, size)
rescue IncompleteBufferException
# fall through, let ret remain nil
end
ret
end
# The buffer size for messages.
MSG_BUF_SIZE = 4096
# Fill (append) the buffer from data that might be available on the
# socket.
# @return [void]
# @raise EOFError
def buffer_from_socket_nonblock
@buffer += @socket.read_nonblock(MSG_BUF_SIZE)
rescue EOFError
raise # the caller expects it
rescue Errno::EAGAIN
# fine, would block
rescue Exception => e
puts "Oops:", e
raise if @is_tcp # why?
puts "WARNING: read_nonblock failed, falling back to .recv"
@buffer += @socket.recv(MSG_BUF_SIZE)
end
end
end
|
