diff options
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/examples/Makefile.am | 2 | ||||
| -rw-r--r-- | docs/examples/ghiper.c | 462 |
2 files changed, 463 insertions, 1 deletions
diff --git a/docs/examples/Makefile.am b/docs/examples/Makefile.am index 5cd572401..060697a84 100644 --- a/docs/examples/Makefile.am +++ b/docs/examples/Makefile.am @@ -12,7 +12,7 @@ EXTRA_DIST = README curlgtk.c sepheaders.c simple.c postit2.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 \ - 10-at-a-time.c hiperfifo.c + 10-at-a-time.c hiperfifo.c ghiper.c all: @echo "done" diff --git a/docs/examples/ghiper.c b/docs/examples/ghiper.c new file mode 100644 index 000000000..7a3ae90c6 --- /dev/null +++ b/docs/examples/ghiper.c @@ -0,0 +1,462 @@ +/***************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * $Id: ghiper.c + * + * 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; + + + + +static void update_timeout(GlobalInfo *g); + + + + +/* 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); + if ( g->still_running ) { update_timeout(g); } + return FALSE; +} + + + + +/* Update the event timer after curl_multi library calls */ +static void update_timeout(GlobalInfo *g) +{ + long timeout_ms; + curl_multi_timeout(g->multi, &timeout_ms); + if ( timeout_ms < 0 ) { return; } + /* MSG_OUT("update_timeout to %ld ms\n", timeout_ms); */ + g->timer_event = g_timeout_add(timeout_ms, timer_cb,g); +} + + + +/* 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) { + update_timeout(g); + 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); + do { + rc = curl_multi_socket_all(g->multi, &g->still_running); + } while (CURLM_CALL_MULTI_PERFORM == rc); + update_timeout(g); + g_main_loop_run(gmain); + curl_multi_cleanup(g->multi); + return 0; +} |