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+/***************************************************************************
+ * _ _ ____ _
+ * 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;
+}
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