352 lines
8.8 KiB
C
352 lines
8.8 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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/* <DESC>
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* HTTP/2 server push
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* </DESC>
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*/
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/* curl stuff */
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#include <curl/curl.h>
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#include <curl/mprintf.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* somewhat unix-specific */
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#include <sys/time.h>
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#include <unistd.h>
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#ifndef CURLPIPE_MULTIPLEX
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#error "too old libcurl, cannot do HTTP/2 server push!"
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#endif
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static int verbose = 1;
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static
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int my_trace(CURL *handle, curl_infotype type,
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char *data, size_t size,
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void *userp)
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{
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const char *text;
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(void)handle; /* prevent compiler warning */
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(void)userp;
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switch(type) {
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case CURLINFO_TEXT:
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fprintf(stderr, "== Info: %s", data);
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/* FALLTHROUGH */
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default: /* in case a new one is introduced to shock us */
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return 0;
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case CURLINFO_HEADER_OUT:
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text = "=> Send header";
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break;
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case CURLINFO_DATA_OUT:
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if(verbose <= 1)
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return 0;
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text = "=> Send data";
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break;
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case CURLINFO_HEADER_IN:
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text = "<= Recv header";
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break;
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case CURLINFO_DATA_IN:
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if(verbose <= 1)
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return 0;
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text = "<= Recv data";
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break;
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}
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fprintf(stderr, "%s, %lu bytes (0x%lx)\n",
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text, (unsigned long)size, (unsigned long)size);
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return 0;
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}
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struct transfer {
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int idx;
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CURL *easy;
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char filename[128];
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FILE *out;
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curl_off_t recv_size;
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curl_off_t pause_at;
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int started;
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int paused;
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int resumed;
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int done;
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};
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static size_t transfer_count = 1;
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static struct transfer *transfers;
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static struct transfer *get_transfer_for_easy(CURL *easy)
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{
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size_t i;
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for(i = 0; i < transfer_count; ++i) {
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if(easy == transfers[i].easy)
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return &transfers[i];
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}
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return NULL;
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}
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static size_t my_write_cb(char *buf, size_t nitems, size_t buflen,
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void *userdata)
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{
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struct transfer *t = userdata;
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ssize_t nwritten;
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if(!t->resumed &&
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t->recv_size < t->pause_at &&
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((curl_off_t)(t->recv_size + (nitems * buflen)) >= t->pause_at)) {
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fprintf(stderr, "[t-%d] PAUSE\n", t->idx);
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t->paused = 1;
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return CURL_WRITEFUNC_PAUSE;
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}
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if(!t->out) {
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curl_msnprintf(t->filename, sizeof(t->filename)-1, "download_%u.data",
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t->idx);
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t->out = fopen(t->filename, "wb");
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if(!t->out)
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return 0;
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}
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nwritten = fwrite(buf, nitems, buflen, t->out);
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if(nwritten < 0) {
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fprintf(stderr, "[t-%d] write failure\n", t->idx);
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return 0;
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}
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t->recv_size += nwritten;
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return (size_t)nwritten;
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}
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static int setup(CURL *hnd, const char *url, struct transfer *t)
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{
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curl_easy_setopt(hnd, CURLOPT_URL, url);
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curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
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curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L);
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curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L);
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curl_easy_setopt(hnd, CURLOPT_WRITEFUNCTION, my_write_cb);
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curl_easy_setopt(hnd, CURLOPT_WRITEDATA, t);
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/* please be verbose */
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if(verbose) {
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curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
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curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
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}
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#if (CURLPIPE_MULTIPLEX > 0)
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/* wait for pipe connection to confirm */
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curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
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#endif
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return 0; /* all is good */
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}
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static void usage(const char *msg)
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{
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if(msg)
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fprintf(stderr, "%s\n", msg);
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fprintf(stderr,
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"usage: [options] url\n"
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" download a url with following options:\n"
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" -m number max parallel downloads\n"
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" -n number total downloads\n"
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" -p number pause transfer after `number` response bytes\n"
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);
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}
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/*
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* Download a file over HTTP/2, take care of server push.
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*/
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int main(int argc, char *argv[])
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{
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CURLM *multi_handle;
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struct CURLMsg *m;
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const char *url;
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size_t i, n, max_parallel = 1;
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size_t active_transfers;
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long pause_offset = 0;
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int abort_paused = 0;
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struct transfer *t;
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int ch;
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while((ch = getopt(argc, argv, "ahm:n:P:")) != -1) {
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switch(ch) {
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case 'h':
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usage(NULL);
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return 2;
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case 'a':
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abort_paused = 1;
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break;
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case 'm':
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max_parallel = (size_t)strtol(optarg, NULL, 10);
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break;
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case 'n':
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transfer_count = (size_t)strtol(optarg, NULL, 10);
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break;
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case 'P':
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pause_offset = strtol(optarg, NULL, 10);
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break;
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default:
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usage("invalid option");
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return 1;
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}
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}
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argc -= optind;
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argv += optind;
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if(argc != 1) {
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usage("not enough arguments");
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return 2;
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}
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url = argv[0];
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transfers = calloc(transfer_count, sizeof(*transfers));
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if(!transfers) {
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fprintf(stderr, "error allocating transfer structs\n");
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return 1;
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}
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multi_handle = curl_multi_init();
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curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
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active_transfers = 0;
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for(i = 0; i < transfer_count; ++i) {
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t = &transfers[i];
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t->idx = (int)i;
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t->pause_at = (curl_off_t)pause_offset * i;
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}
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n = (max_parallel < transfer_count)? max_parallel : transfer_count;
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for(i = 0; i < n; ++i) {
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t = &transfers[i];
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t->easy = curl_easy_init();
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if(!t->easy || setup(t->easy, url, t)) {
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fprintf(stderr, "[t-%d] FAILED setup\n", (int)i);
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return 1;
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}
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curl_multi_add_handle(multi_handle, t->easy);
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t->started = 1;
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++active_transfers;
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fprintf(stderr, "[t-%d] STARTED\n", t->idx);
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}
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do {
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int still_running; /* keep number of running handles */
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CURLMcode mc = curl_multi_perform(multi_handle, &still_running);
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if(still_running) {
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/* wait for activity, timeout or "nothing" */
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mc = curl_multi_poll(multi_handle, NULL, 0, 1000, NULL);
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fprintf(stderr, "curl_multi_poll() -> %d\n", mc);
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}
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if(mc)
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break;
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do {
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int msgq = 0;
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m = curl_multi_info_read(multi_handle, &msgq);
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if(m && (m->msg == CURLMSG_DONE)) {
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CURL *e = m->easy_handle;
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active_transfers--;
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curl_multi_remove_handle(multi_handle, e);
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t = get_transfer_for_easy(e);
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if(t) {
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t->done = 1;
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}
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else
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curl_easy_cleanup(e);
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}
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else {
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/* nothing happening, maintenance */
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if(abort_paused) {
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/* abort paused transfers */
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for(i = 0; i < transfer_count; ++i) {
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t = &transfers[i];
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if(!t->done && t->paused && t->easy) {
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curl_multi_remove_handle(multi_handle, t->easy);
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t->done = 1;
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active_transfers--;
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fprintf(stderr, "[t-%d] ABORTED\n", t->idx);
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}
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}
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}
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else {
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/* resume one paused transfer */
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for(i = 0; i < transfer_count; ++i) {
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t = &transfers[i];
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if(!t->done && t->paused) {
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t->resumed = 1;
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t->paused = 0;
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curl_easy_pause(t->easy, CURLPAUSE_CONT);
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fprintf(stderr, "[t-%d] RESUMED\n", t->idx);
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break;
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}
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}
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}
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while(active_transfers < max_parallel) {
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for(i = 0; i < transfer_count; ++i) {
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t = &transfers[i];
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if(!t->started) {
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t->easy = curl_easy_init();
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if(!t->easy || setup(t->easy, url, t)) {
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fprintf(stderr, "[t-%d] FAILEED setup\n", (int)i);
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return 1;
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}
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curl_multi_add_handle(multi_handle, t->easy);
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t->started = 1;
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++active_transfers;
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fprintf(stderr, "[t-%d] STARTED\n", t->idx);
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break;
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}
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}
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/* all started */
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if(i == transfer_count)
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break;
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}
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}
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} while(m);
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} while(active_transfers); /* as long as we have transfers going */
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for(i = 0; i < transfer_count; ++i) {
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t = &transfers[i];
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if(t->out) {
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fclose(t->out);
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t->out = NULL;
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}
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if(t->easy) {
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curl_easy_cleanup(t->easy);
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t->easy = NULL;
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}
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}
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free(transfers);
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curl_multi_cleanup(multi_handle);
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return 0;
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}
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