1 /*
2 * lws-minimal-ws-client-pmd-bulk
3 *
4 * Written in 2010-2019 by Andy Green <andy@warmcat.com>
5 *
6 * This file is made available under the Creative Commons CC0 1.0
7 * Universal Public Domain Dedication.
8 *
9 * This demonstrates a ws client that sends bulk data in multiple
10 * ws fragments, in a way compatible with per-message deflate.
11 *
12 * It shows how to send huge messages without needing a lot of memory.
13 *
14 * Build and start the minimal-examples/ws-server/minmal-ws-server-pmd-bulk
15 * example first. Running this sends a large message to the server and
16 * exits.
17 *
18 * If you give both sides the -n commandline option, it disables permessage-
19 * deflate compression extension.
20 */
21
22 #include <libwebsockets.h>
23 #include <string.h>
24 #include <signal.h>
25
26 #define LWS_PLUGIN_STATIC
27 #include "protocol_lws_minimal_pmd_bulk.c"
28
29 static struct lws_protocols protocols[] = {
30 { "http", lws_callback_http_dummy, 0, 0, 0, NULL, 0 },
31 LWS_PLUGIN_PROTOCOL_MINIMAL_PMD_BULK,
32 LWS_PROTOCOL_LIST_TERM
33 };
34
35 static int interrupted, options;
36
37 /* pass pointers to shared vars to the protocol */
38
39 static const struct lws_protocol_vhost_options pvo_options = {
40 NULL,
41 NULL,
42 "options", /* pvo name */
43 (void *)&options /* pvo value */
44 };
45
46 static const struct lws_protocol_vhost_options pvo_interrupted = {
47 &pvo_options,
48 NULL,
49 "interrupted", /* pvo name */
50 (void *)&interrupted /* pvo value */
51 };
52
53 static const struct lws_protocol_vhost_options pvo = {
54 NULL, /* "next" pvo linked-list */
55 &pvo_interrupted, /* "child" pvo linked-list */
56 "lws-minimal-pmd-bulk", /* protocol name we belong to on this vhost */
57 "" /* ignored */
58 };
59 static const struct lws_extension extensions[] = {
60 {
61 "permessage-deflate",
62 lws_extension_callback_pm_deflate,
63 "permessage-deflate"
64 "; client_no_context_takeover"
65 "; client_max_window_bits"
66 },
67 { NULL, NULL, NULL /* terminator */ }
68 };
69
sigint_handler(int sig)70 void sigint_handler(int sig)
71 {
72 interrupted = 1;
73 }
74
main(int argc,const char ** argv)75 int main(int argc, const char **argv)
76 {
77 struct lws_context_creation_info info;
78 struct lws_context *context;
79 const char *p;
80 int n = 0, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE
81 /* for LLL_ verbosity above NOTICE to be built into lws,
82 * lws must have been configured and built with
83 * -DCMAKE_BUILD_TYPE=DEBUG instead of =RELEASE */
84 /* | LLL_INFO */ /* | LLL_PARSER */ /* | LLL_HEADER */
85 /* | LLL_EXT */ /* | LLL_CLIENT */ /* | LLL_LATENCY */
86 /* | LLL_DEBUG */;
87
88 signal(SIGINT, sigint_handler);
89
90 if ((p = lws_cmdline_option(argc, argv, "-d")))
91 logs = atoi(p);
92
93 lws_set_log_level(logs, NULL);
94 lwsl_user("LWS minimal ws client + permessage-deflate + multifragment bulk message\n");
95 lwsl_user(" needs minimal-ws-server-pmd-bulk running to communicate with\n");
96 lwsl_user(" %s [-n (no exts)] [-c (compressible)]\n", argv[0]);
97
98 memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
99 info.port = CONTEXT_PORT_NO_LISTEN;
100 info.protocols = protocols;
101 info.pvo = &pvo;
102 if (!lws_cmdline_option(argc, argv, "-n"))
103 info.extensions = extensions;
104 info.pt_serv_buf_size = 32 * 1024;
105
106 if (lws_cmdline_option(argc, argv, "-c"))
107 options |= 1;
108
109 /*
110 * since we know this lws context is only ever going to be used with
111 * one client wsis / fds / sockets at a time, let lws know it doesn't
112 * have to use the default allocations for fd tables up to ulimit -n.
113 * It will just allocate for 1 internal and 1 (+ 1 http2 nwsi) that we
114 * will use.
115 */
116 info.fd_limit_per_thread = 1 + 1 + 1;
117
118 context = lws_create_context(&info);
119 if (!context) {
120 lwsl_err("lws init failed\n");
121 return 1;
122 }
123
124 while (n >= 0 && !interrupted)
125 n = lws_service(context, 0);
126
127 lws_context_destroy(context);
128
129 lwsl_user("Completed %s\n", interrupted == 2 ? "OK" : "failed");
130
131 return interrupted != 2;
132 }
133