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curl/docs/examples/ghiper.c

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/*****************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* $Id$
*
* Example application source code using the multi socket interface to
* download many files at once.
*
* Written by Jeff Pohlmeyer
Requires glib-2.x and a (POSIX?) system that has mkfifo().
This is an adaptation of libcurl's "hipev.c" and libevent's "event-test.c"
sample programs, adapted to use glib's g_io_channel in place of libevent.
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.
This is purely a demo app, all retrieved data is simply discarded by the write
callback.
*/
#include <glib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <curl/curl.h>
#define MSG_OUT g_print /* Change to "g_error" to write to stderr */
#define SHOW_VERBOSE 0 /* Set to non-zero for libcurl messages */
#define SHOW_PROGRESS 0 /* Set to non-zero to enable progress callback */
/* Global information, common to all connections */
typedef struct _GlobalInfo {
CURLM *multi;
guint timer_event;
int prev_running;
int still_running;
int requested; /* count: curl_easy_init() */
int completed; /* count: curl_easy_cleanup() */
} 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;
GIOChannel *ch;
guint ev;
GlobalInfo *global;
} SockInfo;
/* Die if we get a bad CURLMcode somewhere */
static void mcode_or_die(char *where, CURLMcode code) {
if ( CURLM_OK != code ) {
char *s;
switch (code) {
case CURLM_CALL_MULTI_PERFORM: s="CURLM_CALL_MULTI_PERFORM"; break;
case CURLM_OK: s="CURLM_OK"; 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_BAD_SOCKET: s="CURLM_BAD_SOCKET"; break;
case CURLM_UNKNOWN_OPTION: s="CURLM_UNKNOWN_OPTION"; break;
case CURLM_LAST: s="CURLM_LAST"; break;
default: s="CURLM_unknown";
}
MSG_OUT("ERROR: %s returns %s\n", where, s);
exit(code);
}
}
/* Check for completed transfers, and remove their easy handles */
static void check_run_count(GlobalInfo *g)
{
if (g->prev_running > g->still_running) {
char *eff_url=NULL;
CURLMsg *msg;
int msgs_left;
ConnInfo *conn=NULL;
CURL*easy;
CURLcode res;
MSG_OUT("REMAINING: %d\n", g->still_running);
/*
I am still uncertain whether it is safe to remove an easy handle
from inside the curl_multi_info_read loop, so here I will search
for completed transfers in the inner "while" loop, and then remove
them in the outer "do-while" loop...
*/
do {
easy=NULL;
while ((msg = curl_multi_info_read(g->multi, &msgs_left))) {
if (msg->msg == CURLMSG_DONE) {
easy=msg->easy_handle;
res=msg->data.result;
break;
}
}
if (easy) {
curl_easy_getinfo(easy, CURLINFO_PRIVATE, &conn);
curl_easy_getinfo(easy, CURLINFO_EFFECTIVE_URL, &eff_url);
MSG_OUT("DONE: %s => (%d) %s\n", eff_url, res, conn->error);
curl_multi_remove_handle(g->multi, easy);
g_free(conn->url);
curl_easy_cleanup(easy);
g_free(conn);
g->completed++;
}
} while ( easy );
MSG_OUT("Requested: %d Completed:%d\n", g->requested, g->completed);
}
g->prev_running = g->still_running;
}
/* Called by glib when our timeout expires */
static gboolean timer_cb(gpointer data)
{
GlobalInfo *g = (GlobalInfo *)data;
CURLMcode rc;
do {
rc = curl_multi_socket(g->multi, CURL_SOCKET_TIMEOUT, &g->still_running);
} while (rc == CURLM_CALL_MULTI_PERFORM);
mcode_or_die("timer_cb: curl_multi_socket", rc);
check_run_count(g);
return FALSE;
}
/* Update the event timer after curl_multi library calls */
static int update_timeout_cb(CURLM *multi, long timeout_ms, void *userp)
{
struct timeval timeout;
GlobalInfo *g=(GlobalInfo *)userp;
timeout.tv_sec = timeout_ms/1000;
timeout.tv_usec = (timeout_ms%1000)*1000;
MSG_OUT("*** update_timeout_cb %ld => %ld:%ld ***\n",
timeout_ms, timeout.tv_sec, timeout.tv_usec);
g->timer_event = g_timeout_add(timeout_ms, timer_cb, g);
return 0;
}
/* Called by glib when we get action on a multi socket */
static gboolean event_cb(GIOChannel *ch, GIOCondition condition, gpointer data)
{
GlobalInfo *g = (GlobalInfo*) data;
CURLMcode rc;
int fd=g_io_channel_unix_get_fd(ch);
do {
rc = curl_multi_socket(g->multi, fd, &g->still_running);
} while (rc == CURLM_CALL_MULTI_PERFORM);
mcode_or_die("event_cb: curl_multi_socket", rc);
check_run_count(g);
if(g->still_running) {
return TRUE;
} else {
MSG_OUT("last transfer done, kill timeout\n");
if (g->timer_event) { g_source_remove(g->timer_event); }
return FALSE;
}
}
/* Clean up the SockInfo structure */
static void remsock(SockInfo *f)
{
if (!f) { return; }
if (f->ev) { g_source_remove(f->ev); }
g_free(f);
}
/* Assign information to a SockInfo structure */
static void setsock(SockInfo*f, curl_socket_t s, CURL*e, int act, GlobalInfo*g)
{
GIOCondition kind =
(act&CURL_POLL_IN?G_IO_IN:0)|(act&CURL_POLL_OUT?G_IO_OUT:0);
f->sockfd = s;
f->action = act;
f->easy = e;
if (f->ev) { g_source_remove(f->ev); }
f->ev=g_io_add_watch(f->ch, kind, event_cb,g);
}
/* Initialize a new SockInfo structure */
static void addsock(curl_socket_t s, CURL *easy, int action, GlobalInfo *g)
{
SockInfo *fdp = g_malloc0(sizeof(SockInfo));
fdp->global = g;
fdp->ch=g_io_channel_unix_new(s);
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;
char *whatstr[]={ "none", "IN", "OUT", "INOUT", "REMOVE" };
MSG_OUT("socket callback: s=%d e=%p what=%s ", s, e, whatstr[what]);
if (what == CURL_POLL_REMOVE) {
MSG_OUT("\n");
remsock(fdp);
} else {
if (!fdp) {
MSG_OUT("Adding data: %s%s\n",
what&CURL_POLL_IN?"READ":"",
what&CURL_POLL_OUT?"WRITE":"" );
addsock(s, e, what, g);
}
else {
MSG_OUT(
"Changing action from %d to %d\n", fdp->action, 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;
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 = g_malloc0(sizeof(ConnInfo));
conn->error[0]='\0';
conn->easy = curl_easy_init();
if (!conn->easy) {
MSG_OUT("curl_easy_init() failed, exiting!\n");
exit(2);
}
conn->global = g;
conn->url = g_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, SHOW_VERBOSE);
curl_easy_setopt(conn->easy, CURLOPT_ERRORBUFFER, conn->error);
curl_easy_setopt(conn->easy, CURLOPT_PRIVATE, conn);
curl_easy_setopt(conn->easy, CURLOPT_NOPROGRESS, SHOW_PROGRESS?0:1);
curl_easy_setopt(conn->easy, CURLOPT_PROGRESSFUNCTION, prog_cb);
curl_easy_setopt(conn->easy, CURLOPT_PROGRESSDATA, conn);
curl_easy_setopt(conn->easy, CURLOPT_FOLLOWLOCATION, 1);
curl_easy_setopt(conn->easy, CURLOPT_CONNECTTIMEOUT, 30);
curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_LIMIT, 1);
curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_TIME, 30);
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);
g->requested++;
do {
rc = curl_multi_socket_all(g->multi, &g->still_running);
} while (CURLM_CALL_MULTI_PERFORM == rc);
mcode_or_die("new_conn: curl_multi_socket_all", rc);
check_run_count(g);
}
/* This gets called by glib whenever data is received from the fifo */
static gboolean fifo_cb (GIOChannel *ch, GIOCondition condition, gpointer data)
{
#define BUF_SIZE 1024
gsize len, tp;
gchar *buf, *tmp, *all=NULL;
GIOStatus rv;
do {
GError *err=NULL;
rv = g_io_channel_read_line (ch,&buf,&len,&tp,&err);
if ( buf ) {
if (tp) { buf[tp]='\0'; }
new_conn(buf,(GlobalInfo*)data);
g_free(buf);
} else {
buf = g_malloc(BUF_SIZE+1);
while (TRUE) {
buf[BUF_SIZE]='\0';
g_io_channel_read_chars(ch,buf,BUF_SIZE,&len,&err);
if (len) {
buf[len]='\0';
if (all) {
tmp=all;
all=g_strdup_printf("%s%s", tmp, buf);
g_free(tmp);
} else {
all = g_strdup(buf);
}
} 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;
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);
do {
rc = curl_multi_socket_all(g->multi, &g->still_running);
} while (CURLM_CALL_MULTI_PERFORM == rc);
g_main_loop_run(gmain);
curl_multi_cleanup(g->multi);
return 0;
}
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