minimal: client multi

This commit is contained in:
Andy Green 2018-03-25 08:57:43 +08:00
parent bd6fc106d9
commit 3647cd8968
5 changed files with 382 additions and 0 deletions

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@ -1,3 +1,4 @@
|name|demonstrates|
---|---
minimal-http-client-multi|Connects to and reads https://warmcat.com, 8 times concurrently
minimal-http-client|Connects to and reads https://warmcat.com

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cmake_minimum_required(VERSION 2.8)
include(CheckCSourceCompiles)
set(SAMP lws-minimal-http-client-multi)
set(SRCS minimal-http-client-multi.c)
# If we are being built as part of lws, confirm current build config supports
# reqconfig, else skip building ourselves.
#
# If we are being built externally, confirm installed lws was configured to
# support reqconfig, else error out with a helpful message about the problem.
#
MACRO(require_lws_config reqconfig _val result)
if (DEFINED ${reqconfig})
if (${reqconfig})
set (rq 1)
else()
set (rq 0)
endif()
else()
set(rq 0)
endif()
if (${_val} EQUAL ${rq})
set(SAME 1)
else()
set(SAME 0)
endif()
if (LWS_WITH_MINIMAL_EXAMPLES AND NOT ${SAME})
if (${_val})
message("${SAMP}: skipping as lws being built without ${reqconfig}")
else()
message("${SAMP}: skipping as lws built with ${reqconfig}")
endif()
set(${result} 0)
else()
if (LWS_WITH_MINIMAL_EXAMPLES)
set(MET ${SAME})
else()
CHECK_C_SOURCE_COMPILES("#include <libwebsockets.h>\nint main(void) {\n#if defined(${reqconfig})\n return 0;\n#else\n fail;\n#endif\n return 0;\n}\n" HAS_${reqconfig})
if (NOT DEFINED HAS_${reqconfig} OR NOT HAS_${reqconfig})
set(HAS_${reqconfig} 0)
else()
set(HAS_${reqconfig} 1)
endif()
if ((HAS_${reqconfig} AND ${_val}) OR (NOT HAS_${reqconfig} AND NOT ${_val}))
set(MET 1)
else()
set(MET 0)
endif()
endif()
if (NOT MET)
if (${_val})
message(FATAL_ERROR "This project requires lws must have been configured with ${reqconfig}")
else()
message(FATAL_ERROR "Lws configuration of ${reqconfig} is incompatible with this project")
endif()
endif()
endif()
ENDMACRO()
set(requirements 1)
require_lws_config(LWS_WITHOUT_CLIENT 0 requirements)
if (requirements)
add_executable(${SAMP} ${SRCS})
if (websockets_shared)
target_link_libraries(${SAMP} websockets_shared)
add_dependencies(${SAMP} websockets_shared)
else()
target_link_libraries(${SAMP} websockets)
endif()
endif()

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@ -0,0 +1,15 @@
# lws minimal http client multi
## build
```
$ cmake . && make
```
## usage
The application goes to https://warmcat.com and receives the page data
same as minimal http client.
However it does it for 8 client connections concurrently.

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@ -0,0 +1,196 @@
/*
* lws-minimal-http-client-multi
*
* Copyright (C) 2018 Andy Green <andy@warmcat.com>
*
* This file is made available under the Creative Commons CC0 1.0
* Universal Public Domain Dedication.
*
* This demonstrates the a minimal http client using lws, which makes
* 8 downloads simultaneously from warmcat.com.
*
* Currently that takes the form of 8 individual simultaneous tcp and
* tls connections, which happen concurrently. Notice that the ordering
* of the returned payload may be intermingled for the various connections.
*/
#include <libwebsockets.h>
#include <string.h>
#include <signal.h>
#include <assert.h>
#include <time.h>
#define COUNT 8
struct user {
int index;
};
static int interrupted, completed, failed;
static struct lws *client_wsi[COUNT];
static struct user user[COUNT];
static int
callback_http(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
struct user *u = (struct user *)user;
switch (reason) {
/* because we are protocols[0] ... */
case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
lwsl_err("CLIENT_CONNECTION_ERROR: %s\n",
in ? (char *)in : "(null)");
client_wsi[u->index] = NULL;
failed++;
if (++completed == COUNT) {
lwsl_user("Done: failed: %d\n", failed);
interrupted = 1;
}
break;
/* chunks of chunked content, with header removed */
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ:
lwsl_user("RECEIVE_CLIENT_HTTP_READ: conn %d: read %d\n",
u->index, (int)len);
#if 0 /* enable to dump the html */
{
const char *p = in;
while (len--)
if (*p < 0x7f)
putchar(*p++);
else
putchar('.');
}
#endif
return 0; /* don't passthru */
/* uninterpreted http content */
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP:
{
char buffer[1024 + LWS_PRE];
char *px = buffer + LWS_PRE;
int lenx = sizeof(buffer) - LWS_PRE;
if (lws_http_client_read(wsi, &px, &lenx) < 0)
return -1;
}
return 0; /* don't passthru */
case LWS_CALLBACK_COMPLETED_CLIENT_HTTP:
client_wsi[u->index] = NULL;
if (++completed == COUNT) {
lwsl_user("Done: failed: %d\n", failed);
interrupted = 1;
/* so we exit without the poll wait */
lws_cancel_service(lws_get_context(wsi));
}
break;
default:
break;
}
return lws_callback_http_dummy(wsi, reason, user, in, len);
}
static const struct lws_protocols protocols[] = {
{
"http",
callback_http,
0,
0,
},
{ NULL, NULL, 0, 0 }
};
static void
sigint_handler(int sig)
{
interrupted = 1;
}
int main(int argc, char **argv)
{
struct lws_context_creation_info info;
struct lws_client_connect_info i;
struct lws_context *context;
struct timeval start, end;
int n = 0;
signal(SIGINT, sigint_handler);
lws_set_log_level(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 */, NULL);
lwsl_user("LWS minimal http client\n");
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
info.port = CONTEXT_PORT_NO_LISTEN; /* we do not run any server */
info.protocols = protocols;
info.max_http_header_pool = 16;
#if defined(LWS_WITH_MBEDTLS)
/*
* OpenSSL uses the system trust store. mbedTLS has to be told which
* CA to trust explicitly.
*/
info.client_ssl_ca_filepath = "./warmcat.com.cer";
#endif
context = lws_create_context(&info);
if (!context) {
lwsl_err("lws init failed\n");
return 1;
}
memset(&i, 0, sizeof i); /* otherwise uninitialized garbage */
i.context = context;
i.port = 443;
i.address = "warmcat.com";
i.path = "/";
i.host = i.address;
i.origin = i.address;
i.ssl_connection = 1;
i.method = "GET";
i.protocol = protocols[0].name;
gettimeofday(&start, NULL);
for (n = 0; n < (int)LWS_ARRAY_SIZE(client_wsi); n++) {
i.pwsi = &client_wsi[n];
user[n].index = n;
i.userdata = &user[n];
if (!lws_client_connect_via_info(&i)) {
failed++;
if (++completed == COUNT) {
lwsl_user("Done: failed: %d\n", failed);
interrupted = 1;
}
}
}
while (n >= 0 && !interrupted)
n = lws_service(context, 1000);
gettimeofday(&end, NULL);
lwsl_user("Duration: %lldms\n",
(((end.tv_sec * 1000000ll) + end.tv_usec) -
((start.tv_sec * 1000000ll) + start.tv_usec)) / 1000);
lws_context_destroy(context);
lwsl_user("Completed\n");
return 0;
}

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