From 6df85adf3eff596ba7414c53f85db2ab088161e3 Mon Sep 17 00:00:00 2001 From: Daniel Stenberg Date: Tue, 12 Sep 2006 11:25:00 +0000 Subject: hiperfifo.c by Jeff Pohlmeyer --- docs/examples/hiperfifo.c | 412 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 412 insertions(+) create mode 100644 docs/examples/hiperfifo.c (limited to 'docs/examples/hiperfifo.c') diff --git a/docs/examples/hiperfifo.c b/docs/examples/hiperfifo.c new file mode 100644 index 000000000..625ea761f --- /dev/null +++ b/docs/examples/hiperfifo.c @@ -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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#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; +} -- cgit v1.2.3