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1 : // Copyright (c) 2012-2019 Made to Order Software Corp. All Rights Reserved
2 : //
3 : // This program is free software; you can redistribute it and/or modify
4 : // it under the terms of the GNU General Public License as published by
5 : // the Free Software Foundation; either version 2 of the License, or
6 : // (at your option) any later version.
7 : //
8 : // This program is distributed in the hope that it will be useful,
9 : // but WITHOUT ANY WARRANTY; without even the implied warranty of
10 : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 : // GNU General Public License for more details.
12 : //
13 : // You should have received a copy of the GNU General Public License
14 : // along with this program; if not, write to the Free Software
15 : // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
16 :
17 : /** \file
18 : * \brief Implementation of the Snap Communicator class.
19 : *
20 : * This class wraps the C poll() interface in a C++ object with many types
21 : * of objects:
22 : *
23 : * \li Server Connections; for software that want to offer a port to
24 : * which clients can connect to; the server will call accept()
25 : * once a new client connection is ready; this results in a
26 : * Server/Client connection object
27 : * \li Client Connections; for software that want to connect to
28 : * a server; these expect the IP address and port to connect to
29 : * \li Server/Client Connections; for the server when it accepts a new
30 : * connection; in this case the server gets a socket from accept()
31 : * and creates one of these objects to handle the connection
32 : *
33 : * Using the poll() function is the easiest and allows us to listen
34 : * on pretty much any number of sockets (on my server it is limited
35 : * at 16,768 and frankly over 1,000 we probably will start to have
36 : * real slowness issues on small VPN servers.)
37 : */
38 :
39 : // self
40 : //
41 : #include "eventdispatcher/pipe_message_connection.h"
42 :
43 : //#include "eventdispatcher/snap_communicator_dispatcher.h"
44 :
45 :
46 : // snaplogger lib
47 : //
48 : #include "snaplogger/message.h"
49 :
50 :
51 : // snapdev lib
52 : //
53 : #include "snapdev/not_reached.h"
54 : //#include "snapdev/not_used.h"
55 : //#include "snapdev/string_replace_many.h"
56 : //
57 : //
58 : //// libaddr lib
59 : ////
60 : //#include "libaddr/addr_parser.h"
61 : //
62 : //
63 : //// C++ lib
64 : ////
65 : //#include <sstream>
66 : //#include <limits>
67 : //#include <atomic>
68 : //
69 : //
70 : //// C lib
71 : ////
72 : //#include <fcntl.h>
73 : //#include <poll.h>
74 : //#include <unistd.h>
75 : //#include <sys/eventfd.h>
76 : //#include <sys/inotify.h>
77 : //#include <sys/ioctl.h>
78 : //#include <sys/resource.h>
79 : //#include <sys/syscall.h>
80 : //#include <sys/time.h>
81 :
82 :
83 : // last include
84 : //
85 : #include <snapdev/poison.h>
86 :
87 :
88 :
89 :
90 : namespace ed
91 : {
92 :
93 :
94 :
95 : /** \brief Send a message.
96 : *
97 : * This function sends a message to the process on the other side
98 : * of this pipe connection.
99 : *
100 : * \exception event_dispatcher_runtime_error
101 : * This function throws this exception if the write() to the pipe
102 : * fails to write the entire message. This should only happen if
103 : * the pipe gets severed.
104 : *
105 : * \param[in] msg The message to be sent.
106 : * \param[in] cache Whether to cache the message if there is no connection.
107 : * (Ignore because a pipe has to always be there until
108 : * closed and then it can't be reopened.)
109 : *
110 : * \return Always true, although if an error occurs the function throws.
111 : */
112 0 : bool pipe_message_connection::send_message(message const & msg, bool cache)
113 : {
114 0 : snap::NOTUSED(cache);
115 :
116 : // transform the message to a string and write to the socket
117 : // the writing is asynchronous so the message is saved in a cache
118 : // and transferred only later when the run() loop is hit again
119 : //
120 0 : std::string buf(msg.to_message());
121 0 : buf += '\n';
122 0 : return write(buf.c_str(), buf.length()) == static_cast<ssize_t>(buf.length());
123 : }
124 :
125 :
126 : /** \brief Process a line (string) just received.
127 : *
128 : * The function parses the line as a message (snap_communicator_message)
129 : * and then calls the process_message() function if the line was valid.
130 : *
131 : * \param[in] line The line of text that was just read.
132 : */
133 0 : void pipe_message_connection::process_line(std::string const & line)
134 : {
135 0 : if(line.empty())
136 : {
137 0 : return;
138 : }
139 :
140 0 : message msg;
141 0 : if(msg.from_message(line))
142 : {
143 0 : dispatch_message(msg);
144 : }
145 : else
146 : {
147 : // TODO: what to do here? This could be that the version changed
148 : // and the messages are not compatible anymore.
149 : //
150 : SNAP_LOG_ERROR
151 0 : << "snap_communicator::snap_pipe_message_connection::process_line() was asked to process an invalid message ("
152 0 : << line
153 0 : << ")";
154 : }
155 : }
156 :
157 :
158 :
159 6 : } // namespace ed
160 : // vim: ts=4 sw=4 et
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