| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 1998 - 2011, 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. |
| |
| Written by Jeff Pohlmeyer |
| |
| Requires libevent 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 <event.h> |
| #include <fcntl.h> |
| #include <sys/stat.h> |
| #include <errno.h> |
| |
| |
| #define MSG_OUT stdout /* Send info to stdout, change to stderr if you want */ |
| |
| |
| /* Global information, common to all connections */ |
| typedef struct _GlobalInfo { |
| struct event fifo_event; |
| struct event 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 event ev; |
| int evset; |
| GlobalInfo *global; |
| } SockInfo; |
| |
| |
| |
| /* Update the event timer after curl_multi library calls */ |
| static int multi_timer_cb(CURLM *multi, long timeout_ms, GlobalInfo *g) |
| { |
| struct timeval timeout; |
| (void)multi; /* unused */ |
| |
| timeout.tv_sec = timeout_ms/1000; |
| timeout.tv_usec = (timeout_ms%1000)*1000; |
| fprintf(MSG_OUT, "multi_timer_cb: Setting timeout to %ld ms\n", timeout_ms); |
| evtimer_add(&g->timer_event, &timeout); |
| 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(int fd, short kind, void *userp) |
| { |
| GlobalInfo *g = (GlobalInfo*) userp; |
| CURLMcode rc; |
| |
| int action = |
| (kind & EV_READ ? CURL_CSELECT_IN : 0) | |
| (kind & EV_WRITE ? CURL_CSELECT_OUT : 0); |
| |
| rc = curl_multi_socket_action(g->multi, 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"); |
| if (evtimer_pending(&g->timer_event, NULL)) { |
| evtimer_del(&g->timer_event); |
| } |
| } |
| } |
| |
| |
| |
| /* Called by libevent when our timeout expires */ |
| static void timer_cb(int fd, short kind, void *userp) |
| { |
| GlobalInfo *g = (GlobalInfo *)userp; |
| CURLMcode rc; |
| (void)fd; |
| (void)kind; |
| |
| 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) |
| { |
| if (f) { |
| if (f->evset) |
| event_del(&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) |
| { |
| int kind = |
| (act&CURL_POLL_IN?EV_READ:0)|(act&CURL_POLL_OUT?EV_WRITE:0)|EV_PERSIST; |
| |
| f->sockfd = s; |
| f->action = act; |
| f->easy = e; |
| if (f->evset) |
| event_del(&f->ev); |
| event_set(&f->ev, f->sockfd, kind, event_cb, g); |
| f->evset=1; |
| event_add(&f->ev, NULL); |
| } |
| |
| |
| |
| /* 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) |
| { |
| 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); |
| } |
| 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); |
| 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(int fd, short event, void *arg) |
| { |
| char s[1024]; |
| long int rv=0; |
| int n=0; |
| GlobalInfo *g = (GlobalInfo *)arg; |
| (void)fd; /* unused */ |
| (void)event; /* unused */ |
| |
| do { |
| s[0]='\0'; |
| rv=fscanf(g->input, "%1023s%n", s, &n); |
| s[n]='\0'; |
| if ( n && s[0] ) { |
| new_conn(s,arg); /* 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); |
| event_set(&g->fifo_event, sockfd, EV_READ | EV_PERSIST, fifo_cb, g); |
| event_add(&g->fifo_event, NULL); |
| return (0); |
| } |
| |
| int main(int argc, char **argv) |
| { |
| GlobalInfo g; |
| (void)argc; |
| (void)argv; |
| |
| memset(&g, 0, sizeof(GlobalInfo)); |
| event_init(); |
| init_fifo(&g); |
| g.multi = curl_multi_init(); |
| evtimer_set(&g.timer_event, timer_cb, &g); |
| |
| /* setup the generic multi interface options we want */ |
| 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! */ |
| |
| event_dispatch(); |
| curl_multi_cleanup(g.multi); |
| return 0; |
| } |