From bf445b6e12f0a01959edbb3ca6fb548837289718 Mon Sep 17 00:00:00 2001 From: Daniel Stenberg Date: Tue, 2 Jun 2015 11:04:00 +0200 Subject: http2-serverpush.c: example code --- docs/examples/Makefile.inc | 2 +- docs/examples/http2-serverpush.c | 313 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 314 insertions(+), 1 deletion(-) create mode 100644 docs/examples/http2-serverpush.c diff --git a/docs/examples/Makefile.inc b/docs/examples/Makefile.inc index 4b0c28ff4..b2161300b 100644 --- a/docs/examples/Makefile.inc +++ b/docs/examples/Makefile.inc @@ -32,7 +32,7 @@ check_PROGRAMS = 10-at-a-time anyauthput cookie_interface debug fileupload \ imap-list imap-lsub imap-fetch imap-store imap-append imap-examine \ imap-search imap-create imap-delete imap-copy imap-noop imap-ssl \ imap-tls imap-multi url2file sftpget ftpsget postinmemory http2-download \ - http2-upload + http2-upload http2-serverpush # These examples require external dependencies that may not be commonly # available on POSIX systems, so don't bother attempting to compile them here. diff --git a/docs/examples/http2-serverpush.c b/docs/examples/http2-serverpush.c new file mode 100644 index 000000000..cc5bf3037 --- /dev/null +++ b/docs/examples/http2-serverpush.c @@ -0,0 +1,313 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2015, Daniel Stenberg, , et al. + * + * This software is licensed as described in the file COPYING, which + * you should have received as part of this distribution. The terms + * are also available at http://curl.haxx.se/docs/copyright.html. + * + * You may opt to use, copy, modify, merge, publish, distribute and/or sell + * copies of the Software, and permit persons to whom the Software is + * furnished to do so, under the terms of the COPYING file. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ***************************************************************************/ +#include +#include + +/* somewhat unix-specific */ +#include +#include + +/* curl stuff */ +#include + +#ifndef CURLPIPE_MULTIPLEX +#error "too old libcurl, can't do HTTP/2 server push!" +#endif + +static +void dump(const char *text, unsigned char *ptr, size_t size, + char nohex) +{ + size_t i; + size_t c; + + unsigned int width=0x10; + + if(nohex) + /* without the hex output, we can fit more on screen */ + width = 0x40; + + fprintf(stderr, "%s, %ld bytes (0x%lx)\n", + text, (long)size, (long)size); + + for(i=0; i=0x20) && (ptr[i+c]<0x80)?ptr[i+c]:'.'); + /* check again for 0D0A, to avoid an extra \n if it's at width */ + if (nohex && (i+c+2 < size) && ptr[i+c+1]==0x0D && ptr[i+c+2]==0x0A) { + i+=(c+3-width); + break; + } + } + fputc('\n', stderr); /* newline */ + } +} + +static +int my_trace(CURL *handle, curl_infotype type, + char *data, size_t size, + void *userp) +{ + const char *text; + (void)handle; /* prevent compiler warning */ + (void)userp; + switch (type) { + case CURLINFO_TEXT: + fprintf(stderr, "== Info: %s", data); + default: /* in case a new one is introduced to shock us */ + return 0; + + case CURLINFO_HEADER_OUT: + text = "=> Send header"; + break; + case CURLINFO_DATA_OUT: + text = "=> Send data"; + break; + case CURLINFO_SSL_DATA_OUT: + text = "=> Send SSL data"; + break; + case CURLINFO_HEADER_IN: + text = "<= Recv header"; + break; + case CURLINFO_DATA_IN: + text = "<= Recv data"; + break; + case CURLINFO_SSL_DATA_IN: + text = "<= Recv SSL data"; + break; + } + + dump(text, (unsigned char *)data, size, 1); + return 0; +} + +static void setup(CURL *hnd) +{ + FILE *out = fopen("dl", "wb"); + + /* write to this file */ + curl_easy_setopt(hnd, CURLOPT_WRITEDATA, out); + + /* set the same URL */ + curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html"); + + /* send it verbose for max debuggaility */ + curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L); + curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace); + + /* HTTP/2 please */ + curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0); + + /* we use a self-signed test server, skip verification during debugging */ + curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L); + curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L); + +#if (CURLPIPE_MULTIPLEX > 0) + /* wait for pipe connection to confirm */ + curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L); +#endif + +} + +/* called when there's an incoming push */ +static int server_push_callback(CURL *parent, + CURL *easy, + size_t num_headers, + struct curl_pushheaders *headers, + void *userp) +{ + char *headp; + size_t i; + int *transfers = (int *)userp; + char filename[128]; + FILE *out; + static unsigned int count = 0; + + (void)parent; /* we have no use for this */ + + sprintf(filename, "push%u", count++); + + /* here's a new stream, save it in a new file for each new push */ + out = fopen(filename, "wb"); + + /* write to this file */ + curl_easy_setopt(easy, CURLOPT_WRITEDATA, out); + + fprintf(stderr, "**** push callback approves stream %u, got %d headers!\n", + count, (int)num_headers); + + for(i=0; i= 0) { + timeout.tv_sec = curl_timeo / 1000; + if(timeout.tv_sec > 1) + timeout.tv_sec = 1; + else + timeout.tv_usec = (curl_timeo % 1000) * 1000; + } + + /* get file descriptors from the transfers */ + mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd); + + if(mc != CURLM_OK) { + fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc); + break; + } + + /* On success the value of maxfd is guaranteed to be >= -1. We call + select(maxfd + 1, ...); specially in case of (maxfd == -1) there are + no fds ready yet so we call select(0, ...) --or Sleep() on Windows-- + to sleep 100ms, which is the minimum suggested value in the + curl_multi_fdset() doc. */ + + if(maxfd == -1) { +#ifdef _WIN32 + Sleep(100); + rc = 0; +#else + /* Portable sleep for platforms other than Windows. */ + struct timeval wait = { 0, 100 * 1000 }; /* 100ms */ + rc = select(0, NULL, NULL, NULL, &wait); +#endif + } + else { + /* Note that on some platforms 'timeout' may be modified by select(). + If you need access to the original value save a copy beforehand. */ + rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); + } + + switch(rc) { + case -1: + /* select error */ + break; + case 0: + default: + /* timeout or readable/writable sockets */ + curl_multi_perform(multi_handle, &still_running); + break; + } + + /* + * A little caution when doing server push is that libcurl itself has + * created and added one or more easy handles but we need to clean them up + * when we are done. + */ + + do { + int msgq = 0;; + m = curl_multi_info_read(multi_handle, &msgq); + if(m && (m->msg == CURLMSG_DONE)) { + CURL *e = m->easy_handle; + transfers--; + curl_multi_remove_handle(multi_handle, e); + curl_easy_cleanup(e); + } + } while(m); + + } while(transfers); /* as long as we have transfers going */ + + curl_multi_cleanup(multi_handle); + + + return 0; +} -- cgit v1.2.3