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hiperfifo.c by Jeff Pohlmeyer

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This commit is contained in:
Daniel Stenberg 2006-09-12 11:25:00 +00:00
parent 3ee6036551
commit 6df85adf3e
3 changed files with 424 additions and 5 deletions
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3
docs/examples/Makefile.am
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@ -11,7 +11,8 @@ EXTRA_DIST = README curlgtk.c sepheaders.c simple.c postit2.c \
multi-post.c fopen.c simplepost.c makefile.dj curlx.c https.c \
multi-debugcallback.c fileupload.c getinfo.c ftp3rdparty.c debug.c \
anyauthput.c htmltitle.cc htmltidy.c opensslthreadlock.c \
cookie_interface.c cacertinmem.c synctime.c sampleconv.c ftpuploadresume.c
cookie_interface.c cacertinmem.c synctime.c sampleconv.c ftpuploadresume.c \
10-at-a-time.c hiperfifo.c
all:
@echo "done"

14
docs/examples/README
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@ -26,9 +26,9 @@ want you do reorganize them like:
$ `curl-config --cc` -o example example.c `curl-config --cflags --libs`
*PLEASE* do not use the curl.haxx.se site as a test target for your libcurl
applications/experiments. Even if the examples in this directory use that site
as an example URL at some places, it doesn't mean that the URLs work or that
we expect you to actually torture our web site with your tests! Thanks.
applications/experiments. Even if some of the examples use that site as a URL
at some places, it doesn't mean that the URLs work or that we expect you to
actually torture our web site with your tests! Thanks.
EXAMPLES
@ -43,9 +43,11 @@ fopen.c - fopen() layer that supports opening URLs and files
ftp3rdparty.c - FTP 3rd party transfer
ftpget.c - simple getting a file from FTP
ftpgetresp.c - get the response strings from the FTP server
ftpupload.c - upload a file to a FTP server
ftpupload.c - upload a file to an FTP server
ftpuploadresume.c - resume an upload to an FTP server
getinfo.c - get the Content-Type from the recent transfer
getinmemory.c - download a file to memory only
hiperfifo.c - downloads all URLs written to the fifo
htmltitle.cc - download a HTML file and extract the <title> tag from a HTML
page using libxml
http-post.c - HTTP POST
@ -61,8 +63,12 @@ opensslthreadlock.c - show how to do locking when using OpenSSL multi-threaded
persistant.c - request two URLs with a persistant connection
post-callback.c - send a HTTP POST using a callback
postit2.c - send a HTTP multipart formpost
sampleconv.c - showing how a program on a non-ASCII platform would invoke
callbacks to do its own codeset conversions instead of using
the built-in iconv functions in libcurl
sepheaders.c - download headers to a separate file
simple.c - the most simple download a URL source
simplepost.c - HTTP POST
simplessl.c - HTTPS example with certificates many options set
synctime.c - Sync local time by extracing date from remote HTTP servers
10-at-a-time.c - Download many files simultaneously, 10 at a time.

412
docs/examples/hiperfifo.c Normal file
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@ -0,0 +1,412 @@
/*****************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* $Id$
*
* 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 prev_running;
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 void update_timeout(GlobalInfo *g)
{
long timeout_ms;
struct timeval timeout;
curl_multi_timeout(g->multi, &timeout_ms);
timeout.tv_sec = timeout_ms/1000;
timeout.tv_usec = (timeout_ms%1000)*1000;
evtimer_add(&g->timer_event, &timeout);
}
/* Die if we get a bad CURLMcode somewhere */
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";
}
fprintf(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;
fprintf(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;
}
}
if (easy) {
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);
}
} while ( easy );
}
g->prev_running = g->still_running;
}
/* 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;
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) {
update_timeout(g);
} else {
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)
{
(void)fd;
(void)kind;
GlobalInfo *g = (GlobalInfo *)userp;
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);
if ( g->still_running ) { update_timeout(g); }
}
/* Clean up the SockInfo structure */
static void remsock(SockInfo *f)
{
if (!f) { return; }
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;
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%s\n",
what&CURL_POLL_IN?"READ":"",
what&CURL_POLL_OUT?"WRITE":"" );
addsock(s, e, what, g);
}
else {
fprintf(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 */
int prog_cb (void *p, double dltotal, double dlnow, double ult, double uln)
{
ConnInfo *conn = (ConnInfo *)p;
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 */
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, 0);
curl_easy_setopt(conn->easy, CURLOPT_ERRORBUFFER, conn->error);
curl_easy_setopt(conn->easy, CURLOPT_PRIVATE, conn);
curl_easy_setopt(conn->easy, CURLOPT_NOPROGRESS, 0);
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);
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 whenever data is received from the fifo */
void fifo_cb(int fd, short event, void *arg) {
char s[1024];
long int rv=0;
int n=0;
GlobalInfo *g = (GlobalInfo *)arg;
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 */
int init_fifo (GlobalInfo *g) {
struct stat st;
char *fifo = "hiper.fifo";
int socket;
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);
}
socket = open(fifo, O_RDWR | O_NONBLOCK, 0);
if (socket == -1) {
perror("open");
exit (1);
}
g->input = fdopen(socket, "r");
fprintf(MSG_OUT, "Now, pipe some URL's into > %s\n", fifo);
event_set(&g->fifo_event, socket, EV_READ | EV_PERSIST, fifo_cb, g);
event_add(&g->fifo_event, NULL);
return (0);
}
int main(int argc, char **argv)
{
GlobalInfo g;
CURLMcode rc;
memset(&g, 0, sizeof(GlobalInfo));
event_init();
init_fifo(&g);
g.multi = curl_multi_init();
evtimer_set(&g.timer_event, timer_cb, &g);
curl_multi_setopt(g.multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
curl_multi_setopt(g.multi, CURLMOPT_SOCKETDATA, &g);
do {
rc = curl_multi_socket_all(g.multi, &g.still_running);
} while (CURLM_CALL_MULTI_PERFORM == rc);
update_timeout(&g);
event_dispatch();
curl_multi_cleanup(g.multi);
return 0;
}