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-/***************************************************************************
- * _ _ ____ _
- * Project ___| | | | _ \| |
- * / __| | | | |_) | |
- * | (__| |_| | _ <| |___
- * \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
- *
- * This software is licensed as described in the file COPYING, which
- * you should have received as part of this distribution. The terms
- * are also available at http://curl.haxx.se/docs/copyright.html.
- *
- * You may opt to use, copy, modify, merge, publish, distribute and/or sell
- * copies of the Software, and permit persons to whom the Software is
- * furnished to do so, under the terms of the COPYING file.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ***************************************************************************/
-/* Example application source code using the multi socket interface to
- * download many files at once.
- *
- * This example features the same basic functionality as hiperfifo.c does,
- * but this uses libev instead of libevent.
- *
- * Written by Jeff Pohlmeyer, converted to use libev by Markus Koetter
-
-Requires libev and a (POSIX?) system that has mkfifo().
-
-This is an adaptation of libcurl's "hipev.c" and libevent's "event-test.c"
-sample programs.
-
-When running, the program creates the named pipe "hiper.fifo"
-
-Whenever there is input into the fifo, the program reads the input as a list
-of URL's and creates some new easy handles to fetch each URL via the
-curl_multi "hiper" API.
-
-
-Thus, you can try a single URL:
- % echo http://www.yahoo.com > hiper.fifo
-
-Or a whole bunch of them:
- % cat my-url-list > hiper.fifo
-
-The fifo buffer is handled almost instantly, so you can even add more URL's
-while the previous requests are still being downloaded.
-
-Note:
- For the sake of simplicity, URL length is limited to 1023 char's !
-
-This is purely a demo app, all retrieved data is simply discarded by the write
-callback.
-
-*/
-
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <sys/time.h>
-#include <time.h>
-#include <unistd.h>
-#include <sys/poll.h>
-#include <curl/curl.h>
-#include <ev.h>
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <errno.h>
-
-#define DPRINT(x...) printf(x)
-
-#define MSG_OUT stdout /* Send info to stdout, change to stderr if you want */
-
-
-/* Global information, common to all connections */
-typedef struct _GlobalInfo
-{
- struct ev_loop *loop;
- struct ev_io fifo_event;
- struct ev_timer timer_event;
- CURLM *multi;
- int still_running;
- FILE* input;
-} GlobalInfo;
-
-
-/* Information associated with a specific easy handle */
-typedef struct _ConnInfo
-{
- CURL *easy;
- char *url;
- GlobalInfo *global;
- char error[CURL_ERROR_SIZE];
-} ConnInfo;
-
-
-/* Information associated with a specific socket */
-typedef struct _SockInfo
-{
- curl_socket_t sockfd;
- CURL *easy;
- int action;
- long timeout;
- struct ev_io ev;
- int evset;
- GlobalInfo *global;
-} SockInfo;
-
-static void timer_cb(EV_P_ struct ev_timer *w, int revents);
-
-/* Update the event timer after curl_multi library calls */
-static int multi_timer_cb(CURLM *multi, long timeout_ms, GlobalInfo *g)
-{
- DPRINT("%s %li\n", __PRETTY_FUNCTION__, timeout_ms);
- ev_timer_stop(g->loop, &g->timer_event);
- if (timeout_ms > 0)
- {
- double t = timeout_ms / 1000;
- ev_timer_init(&g->timer_event, timer_cb, t, 0.);
- ev_timer_start(g->loop, &g->timer_event);
- }else
- timer_cb(g->loop, &g->timer_event, 0);
- return 0;
-}
-
-/* Die if we get a bad CURLMcode somewhere */
-static void mcode_or_die(const char *where, CURLMcode code)
-{
- if ( CURLM_OK != code )
- {
- const char *s;
- switch ( code )
- {
- case CURLM_CALL_MULTI_PERFORM: s="CURLM_CALL_MULTI_PERFORM"; break;
- case CURLM_BAD_HANDLE: s="CURLM_BAD_HANDLE"; break;
- case CURLM_BAD_EASY_HANDLE: s="CURLM_BAD_EASY_HANDLE"; break;
- case CURLM_OUT_OF_MEMORY: s="CURLM_OUT_OF_MEMORY"; break;
- case CURLM_INTERNAL_ERROR: s="CURLM_INTERNAL_ERROR"; break;
- case CURLM_UNKNOWN_OPTION: s="CURLM_UNKNOWN_OPTION"; break;
- case CURLM_LAST: s="CURLM_LAST"; break;
- default: s="CURLM_unknown";
- break;
- case CURLM_BAD_SOCKET: s="CURLM_BAD_SOCKET";
- fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
- /* ignore this error */
- return;
- }
- fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
- exit(code);
- }
-}
-
-
-
-/* Check for completed transfers, and remove their easy handles */
-static void check_multi_info(GlobalInfo *g)
-{
- char *eff_url;
- CURLMsg *msg;
- int msgs_left;
- ConnInfo *conn;
- CURL *easy;
- CURLcode res;
-
- fprintf(MSG_OUT, "REMAINING: %d\n", g->still_running);
- while ((msg = curl_multi_info_read(g->multi, &msgs_left))) {
- if (msg->msg == CURLMSG_DONE) {
- easy = msg->easy_handle;
- res = msg->data.result;
- curl_easy_getinfo(easy, CURLINFO_PRIVATE, &conn);
- curl_easy_getinfo(easy, CURLINFO_EFFECTIVE_URL, &eff_url);
- fprintf(MSG_OUT, "DONE: %s => (%d) %s\n", eff_url, res, conn->error);
- curl_multi_remove_handle(g->multi, easy);
- free(conn->url);
- curl_easy_cleanup(easy);
- free(conn);
- }
- }
-}
-
-
-
-/* Called by libevent when we get action on a multi socket */
-static void event_cb(EV_P_ struct ev_io *w, int revents)
-{
- DPRINT("%s w %p revents %i\n", __PRETTY_FUNCTION__, w, revents);
- GlobalInfo *g = (GlobalInfo*) w->data;
- CURLMcode rc;
-
- int action = (revents&EV_READ?CURL_POLL_IN:0)|
- (revents&EV_WRITE?CURL_POLL_OUT:0);
- rc = curl_multi_socket_action(g->multi, w->fd, action, &g->still_running);
- mcode_or_die("event_cb: curl_multi_socket_action", rc);
- check_multi_info(g);
- if ( g->still_running <= 0 )
- {
- fprintf(MSG_OUT, "last transfer done, kill timeout\n");
- ev_timer_stop(g->loop, &g->timer_event);
- }
-}
-
-/* Called by libevent when our timeout expires */
-static void timer_cb(EV_P_ struct ev_timer *w, int revents)
-{
- DPRINT("%s w %p revents %i\n", __PRETTY_FUNCTION__, w, revents);
-
- GlobalInfo *g = (GlobalInfo *)w->data;
- CURLMcode rc;
-
- rc = curl_multi_socket_action(g->multi, CURL_SOCKET_TIMEOUT, 0, &g->still_running);
- mcode_or_die("timer_cb: curl_multi_socket_action", rc);
- check_multi_info(g);
-}
-
-/* Clean up the SockInfo structure */
-static void remsock(SockInfo *f, GlobalInfo *g)
-{
- printf("%s \n", __PRETTY_FUNCTION__);
- if ( f )
- {
- if ( f->evset )
- ev_io_stop(g->loop, &f->ev);
- free(f);
- }
-}
-
-
-
-/* Assign information to a SockInfo structure */
-static void setsock(SockInfo*f, curl_socket_t s, CURL*e, int act, GlobalInfo*g)
-{
- printf("%s \n", __PRETTY_FUNCTION__);
-
- int kind = (act&CURL_POLL_IN?EV_READ:0)|(act&CURL_POLL_OUT?EV_WRITE:0);
-
- f->sockfd = s;
- f->action = act;
- f->easy = e;
- if ( f->evset )
- ev_io_stop(g->loop, &f->ev);
- ev_io_init(&f->ev, event_cb, f->sockfd, kind);
- f->ev.data = g;
- f->evset=1;
- ev_io_start(g->loop, &f->ev);
-}
-
-
-
-/* Initialize a new SockInfo structure */
-static void addsock(curl_socket_t s, CURL *easy, int action, GlobalInfo *g)
-{
- SockInfo *fdp = calloc(sizeof(SockInfo), 1);
-
- fdp->global = g;
- setsock(fdp, s, easy, action, g);
- curl_multi_assign(g->multi, s, fdp);
-}
-
-/* CURLMOPT_SOCKETFUNCTION */
-static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
-{
- DPRINT("%s e %p s %i what %i cbp %p sockp %p\n",
- __PRETTY_FUNCTION__, e, s, what, cbp, sockp);
-
- GlobalInfo *g = (GlobalInfo*) cbp;
- SockInfo *fdp = (SockInfo*) sockp;
- const char *whatstr[]={ "none", "IN", "OUT", "INOUT", "REMOVE"};
-
- fprintf(MSG_OUT,
- "socket callback: s=%d e=%p what=%s ", s, e, whatstr[what]);
- if ( what == CURL_POLL_REMOVE )
- {
- fprintf(MSG_OUT, "\n");
- remsock(fdp, g);
- } else
- {
- if ( !fdp )
- {
- fprintf(MSG_OUT, "Adding data: %s\n", whatstr[what]);
- addsock(s, e, what, g);
- } else
- {
- fprintf(MSG_OUT,
- "Changing action from %s to %s\n",
- whatstr[fdp->action], whatstr[what]);
- setsock(fdp, s, e, what, g);
- }
- }
- return 0;
-}
-
-
-/* CURLOPT_WRITEFUNCTION */
-static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *data)
-{
- size_t realsize = size * nmemb;
- ConnInfo *conn = (ConnInfo*) data;
- (void)ptr;
- (void)conn;
- return realsize;
-}
-
-
-/* CURLOPT_PROGRESSFUNCTION */
-static int prog_cb (void *p, double dltotal, double dlnow, double ult,
- double uln)
-{
- ConnInfo *conn = (ConnInfo *)p;
- (void)ult;
- (void)uln;
-
- fprintf(MSG_OUT, "Progress: %s (%g/%g)\n", conn->url, dlnow, dltotal);
- return 0;
-}
-
-
-/* Create a new easy handle, and add it to the global curl_multi */
-static void new_conn(char *url, GlobalInfo *g )
-{
- ConnInfo *conn;
- CURLMcode rc;
-
- conn = calloc(1, sizeof(ConnInfo));
- memset(conn, 0, sizeof(ConnInfo));
- conn->error[0]='\0';
-
- conn->easy = curl_easy_init();
- if ( !conn->easy )
- {
- fprintf(MSG_OUT, "curl_easy_init() failed, exiting!\n");
- exit(2);
- }
- conn->global = g;
- conn->url = strdup(url);
- curl_easy_setopt(conn->easy, CURLOPT_URL, conn->url);
- curl_easy_setopt(conn->easy, CURLOPT_WRITEFUNCTION, write_cb);
- curl_easy_setopt(conn->easy, CURLOPT_WRITEDATA, conn);
- curl_easy_setopt(conn->easy, CURLOPT_VERBOSE, 1L);
- curl_easy_setopt(conn->easy, CURLOPT_ERRORBUFFER, conn->error);
- curl_easy_setopt(conn->easy, CURLOPT_PRIVATE, conn);
- curl_easy_setopt(conn->easy, CURLOPT_NOPROGRESS, 0L);
- curl_easy_setopt(conn->easy, CURLOPT_PROGRESSFUNCTION, prog_cb);
- curl_easy_setopt(conn->easy, CURLOPT_PROGRESSDATA, conn);
- curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_TIME, 3L);
- curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_LIMIT, 10L);
-
- fprintf(MSG_OUT,
- "Adding easy %p to multi %p (%s)\n", conn->easy, g->multi, url);
- rc = curl_multi_add_handle(g->multi, conn->easy);
- mcode_or_die("new_conn: curl_multi_add_handle", rc);
-
- /* note that the add_handle() will set a time-out to trigger very soon so
- that the necessary socket_action() call will be called by this app */
-}
-
-/* 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;
- CURLMcode rc;
- (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 don't 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;
-}