mirror of
https://github.com/warmcat/libwebsockets.git
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297 lines
7.5 KiB
C
297 lines
7.5 KiB
C
/*
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* lws-minimal-http-client-multi
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*
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* Copyright (C) 2018 Andy Green <andy@warmcat.com>
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*
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* This file is made available under the Creative Commons CC0 1.0
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* Universal Public Domain Dedication.
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*
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* This demonstrates the a minimal http client using lws, which makes
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* 8 downloads simultaneously from warmcat.com.
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*
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* Currently that takes the form of 8 individual simultaneous tcp and
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* tls connections, which happen concurrently. Notice that the ordering
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* of the returned payload may be intermingled for the various connections.
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*
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* By default the connections happen all together at the beginning and operate
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* concurrently, which is fast. However this is resource-intenstive, there are
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* 8 tcp connections, 8 tls tunnels on both the client and server. You can
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* instead opt to have the connections happen one after the other inside a
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* single tcp connection and tls tunnel, using HTTP/1.1 pipelining. To be
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* eligible to be pipelined on another existing connection to the same server,
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* the client connection must have the LCCSCF_PIPELINE flag on its
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* info.ssl_connection member (this is independent of whether the connection
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* is in ssl mode or not).
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*
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* HTTP/1.0: Pipelining only possible if Keep-Alive: yes sent by server
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* HTTP/1.1: always possible... serializes requests
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* HTTP/2: always possible... all requests sent as individual streams in parallel
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*/
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#include <libwebsockets.h>
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#include <string.h>
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#include <signal.h>
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#include <assert.h>
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#include <time.h>
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#define COUNT 8
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struct user {
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int index;
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};
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static int interrupted, completed, failed, numbered;
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static struct lws *client_wsi[COUNT];
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static struct user user[COUNT];
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static int
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callback_http(struct lws *wsi, enum lws_callback_reasons reason,
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void *user, void *in, size_t len)
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{
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struct user *u = (struct user *)user;
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switch (reason) {
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/* because we are protocols[0] ... */
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case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
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lwsl_err("CLIENT_CONNECTION_ERROR: %s\n",
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in ? (char *)in : "(null)");
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client_wsi[u->index] = NULL;
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failed++;
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if (++completed == COUNT) {
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lwsl_err("Done: failed: %d\n", failed);
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interrupted = 1;
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}
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break;
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/* chunks of chunked content, with header removed */
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case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ:
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lwsl_user("RECEIVE_CLIENT_HTTP_READ: conn %d: read %d\n",
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u->index, (int)len);
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#if 0 /* enable to dump the html */
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{
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const char *p = in;
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while (len--)
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if (*p < 0x7f)
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putchar(*p++);
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else
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putchar('.');
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}
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#endif
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return 0; /* don't passthru */
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/* uninterpreted http content */
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case LWS_CALLBACK_RECEIVE_CLIENT_HTTP:
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{
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char buffer[1024 + LWS_PRE];
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char *px = buffer + LWS_PRE;
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int lenx = sizeof(buffer) - LWS_PRE;
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if (lws_http_client_read(wsi, &px, &lenx) < 0)
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return -1;
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}
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return 0; /* don't passthru */
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case LWS_CALLBACK_COMPLETED_CLIENT_HTTP:
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lwsl_user("LWS_CALLBACK_COMPLETED_CLIENT_HTTP %p: idx %d\n",
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wsi, u->index);
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client_wsi[u->index] = NULL;
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if (++completed == COUNT) {
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if (!failed)
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lwsl_user("Done: all OK\n");
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else
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lwsl_err("Done: failed: %d\n", failed);
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interrupted = 1;
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/* so we exit immediately */
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lws_cancel_service(lws_get_context(wsi));
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}
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break;
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case LWS_CALLBACK_CLOSED_CLIENT_HTTP:
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if (u && client_wsi[u->index]) {
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/*
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* If it completed normally, it will have been set to
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* NULL then already. So we are dealing with an
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* abnormal, failing, close
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*/
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client_wsi[u->index] = NULL;
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failed++;
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if (++completed == COUNT) {
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lwsl_err("Done: failed: %d\n", failed);
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interrupted = 1;
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}
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}
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break;
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default:
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break;
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}
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return lws_callback_http_dummy(wsi, reason, user, in, len);
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}
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static const struct lws_protocols protocols[] = {
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{ "http", callback_http, 0, 0, },
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{ NULL, NULL, 0, 0 }
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};
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static void
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sigint_handler(int sig)
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{
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interrupted = 1;
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}
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unsigned long long us(void)
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{
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struct timeval t;
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gettimeofday(&t, NULL);
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return (t.tv_sec * 1000000ull) + t.tv_usec;
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}
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static void
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lws_try_client_connection(struct lws_client_connect_info *i, int m)
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{
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char path[128];
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if (numbered) {
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lws_snprintf(path, sizeof(path), "/%d.png", m + 1);
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i->path = path;
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} else
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i->path = "/";
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i->pwsi = &client_wsi[m];
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user[m].index = m;
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i->userdata = &user[m];
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if (!lws_client_connect_via_info(i)) {
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failed++;
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if (++completed == COUNT) {
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lwsl_user("Done: failed: %d\n", failed);
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interrupted = 1;
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}
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} else
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lwsl_user("started connection %p: idx %d (%s)\n",
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client_wsi[m], m, i->path);
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}
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int main(int argc, const char **argv)
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{
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struct lws_context_creation_info info;
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struct lws_client_connect_info i;
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struct lws_context *context;
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unsigned long long start, next;
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const char *p;
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int n = 0, m, staggered = 0, logs =
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LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE
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/* for LLL_ verbosity above NOTICE to be built into lws,
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* lws must have been configured and built with
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* -DCMAKE_BUILD_TYPE=DEBUG instead of =RELEASE */
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/* | LLL_INFO */ /* | LLL_PARSER */ /* | LLL_HEADER */
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/* | LLL_EXT */ /* | LLL_CLIENT */ /* | LLL_LATENCY */
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/* | LLL_DEBUG */;
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signal(SIGINT, sigint_handler);
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memset(&i, 0, sizeof i); /* otherwise uninitialized garbage */
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staggered = !!lws_cmdline_option(argc, argv, "-s");
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if ((p = lws_cmdline_option(argc, argv, "-d")))
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logs = atoi(p);
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lws_set_log_level(logs, NULL);
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lwsl_user("LWS minimal http client [-s (staggered)] [-p (pipeline)]\n");
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lwsl_user(" [--h1 (http/1 only)] [-l (localhost)] [-d <logs>]\n");
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lwsl_user(" [-n (numbered)]\n");
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memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
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info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
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info.port = CONTEXT_PORT_NO_LISTEN; /* we do not run any server */
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info.protocols = protocols;
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#if defined(LWS_WITH_MBEDTLS)
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/*
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* OpenSSL uses the system trust store. mbedTLS has to be told which
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* CA to trust explicitly.
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*/
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info.client_ssl_ca_filepath = "./warmcat.com.cer";
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#endif
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context = lws_create_context(&info);
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if (!context) {
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lwsl_err("lws init failed\n");
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return 1;
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}
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i.context = context;
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i.ssl_connection = LCCSCF_USE_SSL;
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/* enables h1 or h2 connection sharing */
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if (lws_cmdline_option(argc, argv, "-p"))
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i.ssl_connection |= LCCSCF_PIPELINE;
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/* force h1 even if h2 available */
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if (lws_cmdline_option(argc, argv, "--h1"))
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i.alpn = "http/1.1";
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if (lws_cmdline_option(argc, argv, "-l")) {
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i.port = 7681;
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i.address = "localhost";
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i.ssl_connection |= LCCSCF_ALLOW_SELFSIGNED;
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} else {
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i.port = 443;
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i.address = "warmcat.com";
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}
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if (lws_cmdline_option(argc, argv, "-n"))
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numbered = 1;
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if ((p = lws_cmdline_option(argc, argv, "--port")))
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i.port = atoi(p);
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i.host = i.address;
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i.origin = i.address;
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i.method = "GET";
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i.protocol = protocols[0].name;
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if (!staggered)
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/*
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* just pile on all the connections at once, testing the
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* pipeline queuing before the first is connected
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*/
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for (m = 0; m < (int)LWS_ARRAY_SIZE(client_wsi); m++)
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lws_try_client_connection(&i, m);
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next = start = us();
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m = 0;
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while (n >= 0 && !interrupted) {
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if (staggered) {
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/*
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* open the connections at 100ms intervals, with the
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* last one being after 1s, testing both queuing, and
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* direct H2 stream addition stability
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*/
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if (us() > next && m < (int)LWS_ARRAY_SIZE(client_wsi)) {
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lws_try_client_connection(&i, m++);
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if (m == (int)LWS_ARRAY_SIZE(client_wsi) - 1)
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next = us() + 1000000;
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else
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next = us() + 300000;
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}
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}
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n = lws_service(context, 100);
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}
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lwsl_user("Duration: %lldms\n", (us() - start) / 1000);
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lws_context_destroy(context);
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lwsl_user("Exiting with %d\n", failed || completed != COUNT);
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return failed || completed != COUNT;
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}
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