451 lines
12 KiB
C
451 lines
12 KiB
C
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/***************************************************************************
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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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* multi socket interface together with libev
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* </DESC>
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*/
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/* Example application source code using the multi socket interface to
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* download many files at once.
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*
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* This example features the same basic functionality as hiperfifo.c does,
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* but this uses libev instead of libevent.
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*
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* Written by Jeff Pohlmeyer, converted to use libev by Markus Koetter
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Requires libev and a (POSIX?) system that has mkfifo().
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This is an adaptation of libcurl's "hipev.c" and libevent's "event-test.c"
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sample programs.
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When running, the program creates the named pipe "hiper.fifo"
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Whenever there is input into the fifo, the program reads the input as a list
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of URL's and creates some new easy handles to fetch each URL via the
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curl_multi "hiper" API.
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Thus, you can try a single URL:
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% echo http://www.yahoo.com > hiper.fifo
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Or a whole bunch of them:
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% cat my-url-list > hiper.fifo
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The fifo buffer is handled almost instantly, so you can even add more URL's
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while the previous requests are still being downloaded.
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Note:
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For the sake of simplicity, URL length is limited to 1023 char's !
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This is purely a demo app, all retrieved data is simply discarded by the write
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callback.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/poll.h>
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#include <curl/curl.h>
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#include <ev.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <errno.h>
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#define DPRINT(x...) printf(x)
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#define MSG_OUT stdout /* Send info to stdout, change to stderr if you want */
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/* Global information, common to all connections */
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typedef struct _GlobalInfo
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{
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struct ev_loop *loop;
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struct ev_io fifo_event;
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struct ev_timer timer_event;
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CURLM *multi;
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int still_running;
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FILE *input;
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} GlobalInfo;
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/* Information associated with a specific easy handle */
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typedef struct _ConnInfo
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{
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CURL *easy;
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char *url;
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GlobalInfo *global;
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char error[CURL_ERROR_SIZE];
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} ConnInfo;
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/* Information associated with a specific socket */
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typedef struct _SockInfo
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{
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curl_socket_t sockfd;
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CURL *easy;
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int action;
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long timeout;
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struct ev_io ev;
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int evset;
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GlobalInfo *global;
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} SockInfo;
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static void timer_cb(EV_P_ struct ev_timer *w, int revents);
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/* Update the event timer after curl_multi library calls */
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static int multi_timer_cb(CURLM *multi, long timeout_ms, GlobalInfo *g)
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{
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DPRINT("%s %li\n", __PRETTY_FUNCTION__, timeout_ms);
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ev_timer_stop(g->loop, &g->timer_event);
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if(timeout_ms >= 0) {
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/* -1 means delete, other values are timeout times in milliseconds */
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double t = timeout_ms / 1000;
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ev_timer_init(&g->timer_event, timer_cb, t, 0.);
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ev_timer_start(g->loop, &g->timer_event);
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}
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return 0;
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}
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/* Die if we get a bad CURLMcode somewhere */
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static void mcode_or_die(const char *where, CURLMcode code)
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{
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if(CURLM_OK != code) {
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const char *s;
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switch(code) {
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case CURLM_BAD_HANDLE:
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s = "CURLM_BAD_HANDLE";
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break;
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case CURLM_BAD_EASY_HANDLE:
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s = "CURLM_BAD_EASY_HANDLE";
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break;
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case CURLM_OUT_OF_MEMORY:
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s = "CURLM_OUT_OF_MEMORY";
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break;
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case CURLM_INTERNAL_ERROR:
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s = "CURLM_INTERNAL_ERROR";
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break;
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case CURLM_UNKNOWN_OPTION:
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s = "CURLM_UNKNOWN_OPTION";
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break;
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case CURLM_LAST:
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s = "CURLM_LAST";
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break;
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default:
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s = "CURLM_unknown";
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break;
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case CURLM_BAD_SOCKET:
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s = "CURLM_BAD_SOCKET";
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fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
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/* ignore this error */
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return;
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}
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fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
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exit(code);
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}
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}
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/* Check for completed transfers, and remove their easy handles */
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static void check_multi_info(GlobalInfo *g)
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{
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char *eff_url;
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CURLMsg *msg;
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int msgs_left;
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ConnInfo *conn;
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CURL *easy;
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CURLcode res;
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fprintf(MSG_OUT, "REMAINING: %d\n", g->still_running);
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while((msg = curl_multi_info_read(g->multi, &msgs_left))) {
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if(msg->msg == CURLMSG_DONE) {
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easy = msg->easy_handle;
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res = msg->data.result;
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curl_easy_getinfo(easy, CURLINFO_PRIVATE, &conn);
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curl_easy_getinfo(easy, CURLINFO_EFFECTIVE_URL, &eff_url);
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fprintf(MSG_OUT, "DONE: %s => (%d) %s\n", eff_url, res, conn->error);
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curl_multi_remove_handle(g->multi, easy);
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free(conn->url);
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curl_easy_cleanup(easy);
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free(conn);
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}
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}
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}
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/* Called by libevent when we get action on a multi socket */
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static void event_cb(EV_P_ struct ev_io *w, int revents)
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{
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DPRINT("%s w %p revents %i\n", __PRETTY_FUNCTION__, w, revents);
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GlobalInfo *g = (GlobalInfo*) w->data;
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CURLMcode rc;
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int action = ((revents & EV_READ) ? CURL_POLL_IN : 0) |
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((revents & EV_WRITE) ? CURL_POLL_OUT : 0);
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rc = curl_multi_socket_action(g->multi, w->fd, action, &g->still_running);
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mcode_or_die("event_cb: curl_multi_socket_action", rc);
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check_multi_info(g);
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if(g->still_running <= 0) {
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fprintf(MSG_OUT, "last transfer done, kill timeout\n");
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ev_timer_stop(g->loop, &g->timer_event);
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}
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}
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/* Called by libevent when our timeout expires */
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static void timer_cb(EV_P_ struct ev_timer *w, int revents)
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{
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DPRINT("%s w %p revents %i\n", __PRETTY_FUNCTION__, w, revents);
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GlobalInfo *g = (GlobalInfo *)w->data;
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CURLMcode rc;
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rc = curl_multi_socket_action(g->multi, CURL_SOCKET_TIMEOUT, 0,
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&g->still_running);
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mcode_or_die("timer_cb: curl_multi_socket_action", rc);
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check_multi_info(g);
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}
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/* Clean up the SockInfo structure */
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static void remsock(SockInfo *f, GlobalInfo *g)
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{
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printf("%s \n", __PRETTY_FUNCTION__);
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if(f) {
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if(f->evset)
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ev_io_stop(g->loop, &f->ev);
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free(f);
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}
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}
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/* Assign information to a SockInfo structure */
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static void setsock(SockInfo *f, curl_socket_t s, CURL *e, int act,
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GlobalInfo *g)
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{
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printf("%s \n", __PRETTY_FUNCTION__);
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int kind = ((act & CURL_POLL_IN) ? EV_READ : 0) |
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((act & CURL_POLL_OUT) ? EV_WRITE : 0);
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f->sockfd = s;
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f->action = act;
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f->easy = e;
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if(f->evset)
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ev_io_stop(g->loop, &f->ev);
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ev_io_init(&f->ev, event_cb, f->sockfd, kind);
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f->ev.data = g;
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f->evset = 1;
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ev_io_start(g->loop, &f->ev);
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}
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/* Initialize a new SockInfo structure */
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static void addsock(curl_socket_t s, CURL *easy, int action, GlobalInfo *g)
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{
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SockInfo *fdp = calloc(1, sizeof(SockInfo));
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fdp->global = g;
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setsock(fdp, s, easy, action, g);
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curl_multi_assign(g->multi, s, fdp);
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}
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/* CURLMOPT_SOCKETFUNCTION */
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static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
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{
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DPRINT("%s e %p s %i what %i cbp %p sockp %p\n",
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__PRETTY_FUNCTION__, e, s, what, cbp, sockp);
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GlobalInfo *g = (GlobalInfo*) cbp;
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SockInfo *fdp = (SockInfo*) sockp;
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const char *whatstr[]={ "none", "IN", "OUT", "INOUT", "REMOVE"};
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fprintf(MSG_OUT,
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"socket callback: s=%d e=%p what=%s ", s, e, whatstr[what]);
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if(what == CURL_POLL_REMOVE) {
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fprintf(MSG_OUT, "\n");
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remsock(fdp, g);
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}
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else {
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if(!fdp) {
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fprintf(MSG_OUT, "Adding data: %s\n", whatstr[what]);
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addsock(s, e, what, g);
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}
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else {
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fprintf(MSG_OUT,
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"Changing action from %s to %s\n",
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whatstr[fdp->action], whatstr[what]);
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setsock(fdp, s, e, what, g);
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}
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}
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return 0;
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}
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/* CURLOPT_WRITEFUNCTION */
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static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *data)
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{
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size_t realsize = size * nmemb;
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ConnInfo *conn = (ConnInfo*) data;
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(void)ptr;
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(void)conn;
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return realsize;
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}
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/* CURLOPT_PROGRESSFUNCTION */
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static int prog_cb(void *p, double dltotal, double dlnow, double ult,
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double uln)
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{
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ConnInfo *conn = (ConnInfo *)p;
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(void)ult;
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(void)uln;
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fprintf(MSG_OUT, "Progress: %s (%g/%g)\n", conn->url, dlnow, dltotal);
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return 0;
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}
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/* Create a new easy handle, and add it to the global curl_multi */
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static void new_conn(char *url, GlobalInfo *g)
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{
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ConnInfo *conn;
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CURLMcode rc;
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conn = calloc(1, sizeof(ConnInfo));
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conn->error[0]='\0';
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conn->easy = curl_easy_init();
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if(!conn->easy) {
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fprintf(MSG_OUT, "curl_easy_init() failed, exiting!\n");
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exit(2);
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}
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conn->global = g;
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conn->url = strdup(url);
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curl_easy_setopt(conn->easy, CURLOPT_URL, conn->url);
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curl_easy_setopt(conn->easy, CURLOPT_WRITEFUNCTION, write_cb);
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curl_easy_setopt(conn->easy, CURLOPT_WRITEDATA, conn);
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curl_easy_setopt(conn->easy, CURLOPT_VERBOSE, 1L);
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curl_easy_setopt(conn->easy, CURLOPT_ERRORBUFFER, conn->error);
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curl_easy_setopt(conn->easy, CURLOPT_PRIVATE, conn);
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curl_easy_setopt(conn->easy, CURLOPT_NOPROGRESS, 0L);
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curl_easy_setopt(conn->easy, CURLOPT_PROGRESSFUNCTION, prog_cb);
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curl_easy_setopt(conn->easy, CURLOPT_PROGRESSDATA, conn);
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curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_TIME, 3L);
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curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_LIMIT, 10L);
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fprintf(MSG_OUT,
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"Adding easy %p to multi %p (%s)\n", conn->easy, g->multi, url);
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rc = curl_multi_add_handle(g->multi, conn->easy);
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mcode_or_die("new_conn: curl_multi_add_handle", rc);
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/* note that add_handle() sets a timeout to trigger soon so that the
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necessary socket_action() gets called */
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}
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||
|
|
|
||
|
|
/* This gets called whenever data is received from the fifo */
|
||
|
|
static void fifo_cb(EV_P_ struct ev_io *w, int revents)
|
||
|
|
{
|
||
|
|
char s[1024];
|
||
|
|
long int rv = 0;
|
||
|
|
int n = 0;
|
||
|
|
GlobalInfo *g = (GlobalInfo *)w->data;
|
||
|
|
|
||
|
|
do {
|
||
|
|
s[0]='\0';
|
||
|
|
rv = fscanf(g->input, "%1023s%n", s, &n);
|
||
|
|
s[n]='\0';
|
||
|
|
if(n && s[0]) {
|
||
|
|
new_conn(s, g); /* if we read a URL, go get it! */
|
||
|
|
}
|
||
|
|
else
|
||
|
|
break;
|
||
|
|
} while(rv != EOF);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Create a named pipe and tell libevent to monitor it */
|
||
|
|
static int init_fifo(GlobalInfo *g)
|
||
|
|
{
|
||
|
|
struct stat st;
|
||
|
|
static const char *fifo = "hiper.fifo";
|
||
|
|
curl_socket_t sockfd;
|
||
|
|
|
||
|
|
fprintf(MSG_OUT, "Creating named pipe \"%s\"\n", fifo);
|
||
|
|
if(lstat (fifo, &st) == 0) {
|
||
|
|
if((st.st_mode & S_IFMT) == S_IFREG) {
|
||
|
|
errno = EEXIST;
|
||
|
|
perror("lstat");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
unlink(fifo);
|
||
|
|
if(mkfifo (fifo, 0600) == -1) {
|
||
|
|
perror("mkfifo");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
sockfd = open(fifo, O_RDWR | O_NONBLOCK, 0);
|
||
|
|
if(sockfd == -1) {
|
||
|
|
perror("open");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
g->input = fdopen(sockfd, "r");
|
||
|
|
|
||
|
|
fprintf(MSG_OUT, "Now, pipe some URL's into > %s\n", fifo);
|
||
|
|
ev_io_init(&g->fifo_event, fifo_cb, sockfd, EV_READ);
|
||
|
|
ev_io_start(g->loop, &g->fifo_event);
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
GlobalInfo g;
|
||
|
|
(void)argc;
|
||
|
|
(void)argv;
|
||
|
|
|
||
|
|
memset(&g, 0, sizeof(GlobalInfo));
|
||
|
|
g.loop = ev_default_loop(0);
|
||
|
|
|
||
|
|
init_fifo(&g);
|
||
|
|
g.multi = curl_multi_init();
|
||
|
|
|
||
|
|
ev_timer_init(&g.timer_event, timer_cb, 0., 0.);
|
||
|
|
g.timer_event.data = &g;
|
||
|
|
g.fifo_event.data = &g;
|
||
|
|
curl_multi_setopt(g.multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
|
||
|
|
curl_multi_setopt(g.multi, CURLMOPT_SOCKETDATA, &g);
|
||
|
|
curl_multi_setopt(g.multi, CURLMOPT_TIMERFUNCTION, multi_timer_cb);
|
||
|
|
curl_multi_setopt(g.multi, CURLMOPT_TIMERDATA, &g);
|
||
|
|
|
||
|
|
/* we do not call any curl_multi_socket*() function yet as we have no handles
|
||
|
|
added! */
|
||
|
|
|
||
|
|
ev_loop(g.loop, 0);
|
||
|
|
curl_multi_cleanup(g.multi);
|
||
|
|
return 0;
|
||
|
|
}
|