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websocket_client.c
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websocket_client.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <libwebsockets.h>
#include <pthread.h>
static struct lws_context *context;
static int interrupted, port = 7681;
static char address[] = "127.0.0.1";
static int client_established = 0;
struct lws *lws = NULL;
static char *fmt = "{\"message\":\"data\",\"count\":%d}";
static int n = 0;
static void *lws_write_pthread(void *arg)
{
while (!interrupted)
{
if (client_established && lws != NULL)
{
lwsl_user("-------send\n");
lws_callback_on_writable(lws);
}
usleep(10);
}
}
static int
callback_websocket_client(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
switch (reason)
{
case LWS_CALLBACK_PROTOCOL_INIT:
lwsl_user("LWS_CALLBACK_PROTOCOL_INIT\n");
break;
case LWS_CALLBACK_CLIENT_ESTABLISHED:
lwsl_user("LWS_CALLBACK_CLIENT_ESTABLISHED\n");
client_established = 1;
lws = wsi;
pthread_t pt;
pthread_create(&pt, NULL, (void *)lws_write_pthread, NULL);
break;
case LWS_CALLBACK_CLIENT_WRITEABLE:
lwsl_user("LWS_CALLBACK_CLIENT_WRITEABLE\n");
// 通过WebSocket发送文本消息
char send_data[256] = {0};
sprintf(send_data, fmt, n);
int send_data_len = strlen(send_data);
char *write_data = malloc(send_data_len + LWS_PRE + 1);
memset(write_data, 0, send_data_len + LWS_PRE + 1);
memcpy(write_data + LWS_PRE, send_data, send_data_len);
lws_write(lws, write_data + LWS_PRE, send_data_len, LWS_WRITE_TEXT);
free(write_data);
n++;
break;
case LWS_CALLBACK_CLIENT_RECEIVE:
lwsl_user("LWS_CALLBACK_CLIENT_RECEIVE: %4d (rpp %5d, first %d, last %d, bin %d)\n",
(int)len, (int)lws_remaining_packet_payload(wsi),
lws_is_first_fragment(wsi),
lws_is_final_fragment(wsi),
lws_frame_is_binary(wsi));
lwsl_warn("recvied message:%s\n", (char *)in);
break;
case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
lwsl_err("CLIENT_CONNECTION_ERROR: %s\n",
in ? (char *)in : "(null)");
break;
case LWS_CALLBACK_CLIENT_CLOSED:
lwsl_user("LWS_CALLBACK_CLIENT_CLOSED\n");
lws = NULL;
break;
/* rate-limited client connect retries */
case LWS_CALLBACK_USER:
lwsl_notice("%s: LWS_CALLBACK_USER\n", __func__);
break;
default:
break;
}
return 0;
}
static struct lws_protocols protocols[] = {
{"websocket",
callback_websocket_client,
128,
4096,
0,
NULL,
0},
{NULL, NULL, 0, 0} /* terminator */
};
void sigint_handler(int sig)
{
interrupted = 1;
}
int main(int argc, const char **argv)
{
struct lws_context_creation_info info;
const char *p;
int n, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE
/* for LLL_ verbosity above NOTICE to be built into lws,
* lws must have been configured and built with
* -DCMAKE_BUILD_TYPE=DEBUG instead of =RELEASE */
/* | LLL_INFO */ /* | LLL_PARSER */ /* | LLL_HEADER */
/* | LLL_EXT */ /* | LLL_CLIENT */ /* | LLL_LATENCY */
/* | LLL_DEBUG */;
if ((p = lws_cmdline_option(argc, argv, "-d")))
logs = atoi(p);
lws_set_log_level(logs, NULL);
lwsl_user("LWS minimal ws client echo + permessage-deflate + multifragment bulk message\n");
lwsl_user(" lws-minimal-ws-client-echo [-n (no exts)] [-p port] [-o (once)]\n");
if ((p = lws_cmdline_option(argc, argv, "-p")))
port = atoi(p);
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
info.iface = NULL;
info.port = CONTEXT_PORT_NO_LISTEN;
info.protocols = protocols;
info.pt_serv_buf_size = 32 * 1024;
info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT |
LWS_SERVER_OPTION_VALIDATE_UTF8;
/*
* since we know this lws context is only ever going to be used with
* one client wsis / fds / sockets at a time, let lws know it doesn't
* have to use the default allocations for fd tables up to ulimit -n.
* It will just allocate for 1 internal and 1 (+ 1 http2 nwsi) that we
* will use.
*/
info.fd_limit_per_thread = 1 + 1 + 1;
signal(SIGINT, sigint_handler);
context = lws_create_context(&info);
char addr_port[256] = {0};
sprintf(addr_port, "%s:%u", address, port & 65535);
struct lws_client_connect_info conn_info = {0};
conn_info.context = context;
conn_info.address = address;
conn_info.port = port;
conn_info.host = addr_port;
conn_info.protocol = protocols[0].name;
struct lws *wsi = lws_client_connect_via_info(&conn_info);
if (!context)
{
lwsl_err("lws init failed\n");
return 1;
}
else
{
lwsl_user("lws init success\n");
}
while (!lws_service(context, 0) && !interrupted)
{
};
lws_context_destroy(context);
n = interrupted != 1;
lwsl_user("Completed %d %s\n", interrupted, !n ? "OK" : "failed");
return n;
}