412 lines
11 KiB
C
412 lines
11 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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* $Id$
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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 libevent 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 <event.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 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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struct event fifo_event;
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struct event timer_event;
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CURLM *multi;
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int prev_running;
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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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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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struct event ev;
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int evset;
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GlobalInfo *global;
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} SockInfo;
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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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struct timeval timeout;
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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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fprintf(MSG_OUT, "multi_timer_cb: Setting timeout to %ld ms\n", timeout_ms);
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evtimer_add(&g->timer_event, &timeout);
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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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void mcode_or_die(char *where, CURLMcode code) {
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if ( CURLM_OK != code ) {
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char *s;
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switch (code) {
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case CURLM_CALL_MULTI_PERFORM: s="CURLM_CALL_MULTI_PERFORM"; break;
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case CURLM_OK: s="CURLM_OK"; break;
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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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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_run_count(GlobalInfo *g)
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{
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if (g->prev_running > g->still_running) {
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char *eff_url=NULL;
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CURLMsg *msg;
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int msgs_left;
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ConnInfo *conn=NULL;
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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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/*
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I am still uncertain whether it is safe to remove an easy handle
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from inside the curl_multi_info_read loop, so here I will search
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for completed transfers in the inner "while" loop, and then remove
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them in the outer "do-while" loop...
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*/
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do {
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easy=NULL;
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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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break;
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}
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}
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if (easy) {
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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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} while ( easy );
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}
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g->prev_running = g->still_running;
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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(int fd, short kind, void *userp)
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{
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GlobalInfo *g = (GlobalInfo*) userp;
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CURLMcode rc;
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do {
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rc = curl_multi_socket(g->multi, fd, &g->still_running);
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} while (rc == CURLM_CALL_MULTI_PERFORM);
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mcode_or_die("event_cb: curl_multi_socket", rc);
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check_run_count(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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if (evtimer_pending(&g->timer_event, NULL)) {
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evtimer_del(&g->timer_event);
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}
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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(int fd, short kind, void *userp)
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{
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(void)fd;
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(void)kind;
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GlobalInfo *g = (GlobalInfo *)userp;
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CURLMcode rc;
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do {
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rc = curl_multi_socket(g->multi, CURL_SOCKET_TIMEOUT, &g->still_running);
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} while (rc == CURLM_CALL_MULTI_PERFORM);
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mcode_or_die("timer_cb: curl_multi_socket", rc);
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check_run_count(g);
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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) { return; }
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if (f->evset) { event_del(&f->ev); }
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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, GlobalInfo*g)
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{
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int kind =
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(act&CURL_POLL_IN?EV_READ:0)|(act&CURL_POLL_OUT?EV_WRITE:0)|EV_PERSIST;
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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) { event_del(&f->ev); }
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event_set( &f->ev, f->sockfd, kind, event_cb, g);
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f->evset=1;
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event_add(&f->ev, NULL);
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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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SockInfo *fdp = calloc(sizeof(SockInfo), 1);
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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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GlobalInfo *g = (GlobalInfo*) cbp;
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SockInfo *fdp = (SockInfo*) sockp;
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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);
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} else {
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if (!fdp) {
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fprintf(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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fprintf(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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int prog_cb (void *p, double dltotal, double dlnow, double ult, double uln)
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{
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ConnInfo *conn = (ConnInfo *)p;
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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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void new_conn(char *url, GlobalInfo *g ) {
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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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memset(conn, 0, 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, 0);
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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, 0);
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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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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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do {
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rc = curl_multi_socket_all(g->multi, &g->still_running);
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} while (CURLM_CALL_MULTI_PERFORM == rc);
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mcode_or_die("new_conn: curl_multi_socket_all", rc);
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check_run_count(g);
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}
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/* This gets called whenever data is received from the fifo */
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void fifo_cb(int fd, short event, void *arg) {
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char s[1024];
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long int rv=0;
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int n=0;
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GlobalInfo *g = (GlobalInfo *)arg;
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do {
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s[0]='\0';
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rv=fscanf(g->input, "%1023s%n", s, &n);
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s[n]='\0';
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if ( n && s[0] ) {
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new_conn(s,arg); /* if we read a URL, go get it! */
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} else break;
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} while ( rv != EOF);
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}
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/* Create a named pipe and tell libevent to monitor it */
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int init_fifo (GlobalInfo *g) {
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struct stat st;
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char *fifo = "hiper.fifo";
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int socket;
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fprintf(MSG_OUT, "Creating named pipe \"%s\"\n", fifo);
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if (lstat (fifo, &st) == 0) {
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if ((st.st_mode & S_IFMT) == S_IFREG) {
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errno = EEXIST;
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perror("lstat");
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exit (1);
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}
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}
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unlink(fifo);
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if (mkfifo (fifo, 0600) == -1) {
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perror("mkfifo");
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exit (1);
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}
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socket = open(fifo, O_RDWR | O_NONBLOCK, 0);
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if (socket == -1) {
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perror("open");
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exit (1);
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}
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g->input = fdopen(socket, "r");
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fprintf(MSG_OUT, "Now, pipe some URL's into > %s\n", fifo);
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event_set(&g->fifo_event, socket, EV_READ | EV_PERSIST, fifo_cb, g);
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event_add(&g->fifo_event, NULL);
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return (0);
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}
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int main(int argc, char **argv)
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{
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GlobalInfo g;
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CURLMcode rc;
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memset(&g, 0, sizeof(GlobalInfo));
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event_init();
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init_fifo(&g);
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g.multi = curl_multi_init();
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evtimer_set(&g.timer_event, timer_cb, &g);
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curl_multi_setopt(g.multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
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curl_multi_setopt(g.multi, CURLMOPT_SOCKETDATA, &g);
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curl_multi_setopt(g.multi, CURLMOPT_TIMERFUNCTION, multi_timer_cb);
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curl_multi_setopt(g.multi, CURLMOPT_TIMERDATA, &g);
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do {
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rc = curl_multi_socket_all(g.multi, &g.still_running);
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} while (CURLM_CALL_MULTI_PERFORM == rc);
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event_dispatch();
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curl_multi_cleanup(g.multi);
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return 0;
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}
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