437 lines
12 KiB
C
437 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) 1998 - 2019, 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.haxx.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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***************************************************************************/
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/* <DESC>
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* multi socket API usage together with with glib2
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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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* Written by Jeff Pohlmeyer
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Requires glib-2.x 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, adapted to use glib's g_io_channel in place of libevent.
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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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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 <glib.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <curl/curl.h>
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#define MSG_OUT g_print /* Change to "g_error" to write to stderr */
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#define SHOW_VERBOSE 0 /* Set to non-zero for libcurl messages */
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#define SHOW_PROGRESS 0 /* Set to non-zero to enable progress callback */
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/* Global information, common to all connections */
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typedef struct _GlobalInfo {
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CURLM *multi;
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guint timer_event;
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int still_running;
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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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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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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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GIOChannel *ch;
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guint ev;
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GlobalInfo *global;
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} SockInfo;
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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: s = "CURLM_BAD_HANDLE"; break;
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case CURLM_BAD_EASY_HANDLE: s = "CURLM_BAD_EASY_HANDLE"; break;
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case CURLM_OUT_OF_MEMORY: s = "CURLM_OUT_OF_MEMORY"; break;
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case CURLM_INTERNAL_ERROR: s = "CURLM_INTERNAL_ERROR"; break;
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case CURLM_BAD_SOCKET: s = "CURLM_BAD_SOCKET"; break;
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case CURLM_UNKNOWN_OPTION: s = "CURLM_UNKNOWN_OPTION"; break;
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case CURLM_LAST: s = "CURLM_LAST"; break;
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default: s = "CURLM_unknown";
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}
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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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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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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 glib when our timeout expires */
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static gboolean timer_cb(gpointer data)
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{
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GlobalInfo *g = (GlobalInfo *)data;
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CURLMcode rc;
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rc = curl_multi_socket_action(g->multi,
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CURL_SOCKET_TIMEOUT, 0, &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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return FALSE;
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}
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/* Update the event timer after curl_multi library calls */
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static int update_timeout_cb(CURLM *multi, long timeout_ms, void *userp)
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{
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struct timeval timeout;
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GlobalInfo *g = (GlobalInfo *)userp;
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timeout.tv_sec = timeout_ms/1000;
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timeout.tv_usec = (timeout_ms%1000)*1000;
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MSG_OUT("*** update_timeout_cb %ld => %ld:%ld ***\n",
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timeout_ms, timeout.tv_sec, timeout.tv_usec);
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/*
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* if timeout_ms is -1, just delete the timer
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*
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* For other values of timeout_ms, this should set or *update* the timer to
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* the new value
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*/
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if(timeout_ms >= 0)
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g->timer_event = g_timeout_add(timeout_ms, timer_cb, g);
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return 0;
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}
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/* Called by glib when we get action on a multi socket */
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static gboolean event_cb(GIOChannel *ch, GIOCondition condition, gpointer data)
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{
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GlobalInfo *g = (GlobalInfo*) data;
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CURLMcode rc;
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int fd = g_io_channel_unix_get_fd(ch);
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int action =
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(condition & G_IO_IN ? CURL_CSELECT_IN : 0) |
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(condition & G_IO_OUT ? CURL_CSELECT_OUT : 0);
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rc = curl_multi_socket_action(g->multi, 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) {
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return TRUE;
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}
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else {
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MSG_OUT("last transfer done, kill timeout\n");
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if(g->timer_event) {
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g_source_remove(g->timer_event);
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}
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return FALSE;
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}
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}
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/* Clean up the SockInfo structure */
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static void remsock(SockInfo *f)
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{
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if(!f) {
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return;
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}
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if(f->ev) {
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g_source_remove(f->ev);
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}
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g_free(f);
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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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GIOCondition kind =
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(act&CURL_POLL_IN?G_IO_IN:0)|(act&CURL_POLL_OUT?G_IO_OUT: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->ev) {
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g_source_remove(f->ev);
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}
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f->ev = g_io_add_watch(f->ch, kind, event_cb, g);
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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 = g_malloc0(sizeof(SockInfo));
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fdp->global = g;
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fdp->ch = g_io_channel_unix_new(s);
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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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GlobalInfo *g = (GlobalInfo*) cbp;
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SockInfo *fdp = (SockInfo*) sockp;
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static const char *whatstr[]={ "none", "IN", "OUT", "INOUT", "REMOVE" };
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MSG_OUT("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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MSG_OUT("\n");
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remsock(fdp);
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}
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else {
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if(!fdp) {
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MSG_OUT("Adding data: %s%s\n",
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what&CURL_POLL_IN?"READ":"",
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what&CURL_POLL_OUT?"WRITE":"");
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addsock(s, e, what, g);
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}
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else {
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MSG_OUT(
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"Changing action from %d to %d\n", fdp->action, 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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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 = g_malloc0(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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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 = g_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, (long)SHOW_VERBOSE);
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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, SHOW_PROGRESS?0L:1L);
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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_FOLLOWLOCATION, 1L);
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curl_easy_setopt(conn->easy, CURLOPT_CONNECTTIMEOUT, 30L);
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curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_LIMIT, 1L);
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curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_TIME, 30L);
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MSG_OUT("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 the add_handle() will set a time-out to trigger very soon so
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that the necessary socket_action() call will be called by this app */
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}
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/* This gets called by glib whenever data is received from the fifo */
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static gboolean fifo_cb(GIOChannel *ch, GIOCondition condition, gpointer data)
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{
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#define BUF_SIZE 1024
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gsize len, tp;
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gchar *buf, *tmp, *all = NULL;
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GIOStatus rv;
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do {
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GError *err = NULL;
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rv = g_io_channel_read_line(ch, &buf, &len, &tp, &err);
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if(buf) {
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if(tp) {
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buf[tp]='\0';
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}
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new_conn(buf, (GlobalInfo*)data);
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g_free(buf);
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}
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else {
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buf = g_malloc(BUF_SIZE + 1);
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while(TRUE) {
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buf[BUF_SIZE]='\0';
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g_io_channel_read_chars(ch, buf, BUF_SIZE, &len, &err);
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if(len) {
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buf[len]='\0';
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if(all) {
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tmp = all;
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all = g_strdup_printf("%s%s", tmp, buf);
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g_free(tmp);
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}
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else {
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all = g_strdup(buf);
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}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if(all) {
|
||
|
|
new_conn(all, (GlobalInfo*)data);
|
||
|
|
g_free(all);
|
||
|
|
}
|
||
|
|
g_free(buf);
|
||
|
|
}
|
||
|
|
if(err) {
|
||
|
|
g_error("fifo_cb: %s", err->message);
|
||
|
|
g_free(err);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
} while((len) && (rv == G_IO_STATUS_NORMAL));
|
||
|
|
return TRUE;
|
||
|
|
}
|
||
|
|
|
||
|
|
int init_fifo(void)
|
||
|
|
{
|
||
|
|
struct stat st;
|
||
|
|
const char *fifo = "hiper.fifo";
|
||
|
|
int socket;
|
||
|
|
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
|
||
|
|
socket = open(fifo, O_RDWR | O_NONBLOCK, 0);
|
||
|
|
|
||
|
|
if(socket == -1) {
|
||
|
|
perror("open");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
MSG_OUT("Now, pipe some URL's into > %s\n", fifo);
|
||
|
|
|
||
|
|
return socket;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
GlobalInfo *g;
|
||
|
|
CURLMcode rc;
|
||
|
|
GMainLoop*gmain;
|
||
|
|
int fd;
|
||
|
|
GIOChannel* ch;
|
||
|
|
g = g_malloc0(sizeof(GlobalInfo));
|
||
|
|
|
||
|
|
fd = init_fifo();
|
||
|
|
ch = g_io_channel_unix_new(fd);
|
||
|
|
g_io_add_watch(ch, G_IO_IN, fifo_cb, g);
|
||
|
|
gmain = g_main_loop_new(NULL, FALSE);
|
||
|
|
g->multi = curl_multi_init();
|
||
|
|
curl_multi_setopt(g->multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
|
||
|
|
curl_multi_setopt(g->multi, CURLMOPT_SOCKETDATA, g);
|
||
|
|
curl_multi_setopt(g->multi, CURLMOPT_TIMERFUNCTION, update_timeout_cb);
|
||
|
|
curl_multi_setopt(g->multi, CURLMOPT_TIMERDATA, g);
|
||
|
|
|
||
|
|
/* we don't call any curl_multi_socket*() function yet as we have no handles
|
||
|
|
added! */
|
||
|
|
|
||
|
|
g_main_loop_run(gmain);
|
||
|
|
curl_multi_cleanup(g->multi);
|
||
|
|
return 0;
|
||
|
|
}
|