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examples/hiperfifo.c: improved

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* use member struct event’s instead of pointers to alloc’d struct
   events

 * simplify the cases for the mcode_or_die() function via macros;

 * make multi_timer_cb() actually do what the block comment says it
   should;

 * accept a “stop” command on the FIFO to shut down the service;

 * use cleaner notation for unused variables than the (void) hack;

 * allow following redirections (304’s);
This commit is contained in:
Philip Prindeville 2018-03-16 16:01:01 +01:00 committed by Daniel Stenberg
parent f5700ea88b
commit 9434194be8
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GPG Key ID: 5CC908FDB71E12C2
1 changed files with 76 additions and 64 deletions
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138
docs/examples/hiperfifo.c
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@ -66,10 +66,17 @@ callback.
#include <sys/poll.h>
#include <curl/curl.h>
#include <event2/event.h>
#include <event2/event_struct.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
#include <sys/cdefs.h>
#ifdef __GNUC__
#define _Unused __attribute__((unused))
#else
#define _Unused
#endif
#define MSG_OUT stdout /* Send info to stdout, change to stderr if you want */
@ -78,11 +85,12 @@ callback.
typedef struct _GlobalInfo
{
struct event_base *evbase;
struct event *fifo_event;
struct event *timer_event;
struct event fifo_event;
struct event timer_event;
CURLM *multi;
int still_running;
FILE *input;
int stopped;
} GlobalInfo;
@ -103,16 +111,42 @@ typedef struct _SockInfo
CURL *easy;
int action;
long timeout;
struct event *ev;
int evset;
struct event ev;
GlobalInfo *global;
} SockInfo;
#define __case(code) \
case code: s = __STRING(code)
/* 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_BAD_HANDLE); break;
__case(CURLM_BAD_EASY_HANDLE); break;
__case(CURLM_OUT_OF_MEMORY); break;
__case(CURLM_INTERNAL_ERROR); break;
__case(CURLM_UNKNOWN_OPTION); break;
__case(CURLM_LAST); break;
default: s = "CURLM_unknown"; break;
__case(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);
}
}
/* Update the event timer after curl_multi library calls */
static int multi_timer_cb(CURLM *multi, long timeout_ms, GlobalInfo *g)
static int multi_timer_cb(CURLM *multi _Unused, long timeout_ms, GlobalInfo *g)
{
struct timeval timeout;
(void)multi; /* unused */
CURLMcode rc;
timeout.tv_sec = timeout_ms/1000;
timeout.tv_usec = (timeout_ms%1000)*1000;
@ -127,35 +161,17 @@ static int multi_timer_cb(CURLM *multi, long timeout_ms, GlobalInfo *g)
* for all other values of timeout_ms, this should set or *update*
* the timer to the new value
*/
evtimer_add(g->timer_event, &timeout);
if (timeout_ms == 0) {
rc = curl_multi_socket_action(g->multi,
CURL_SOCKET_TIMEOUT, 0, &g->still_running);
mcode_or_die("multi_timer_cb: curl_multi_socket_action", rc);
} else if (timeout_ms == -1)
evtimer_del(&g->timer_event);
else
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_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)
@ -181,6 +197,8 @@ static void check_multi_info(GlobalInfo *g)
free(conn);
}
}
if (g->still_running == 0 && g->stopped)
event_base_loopbreak(g->evbase);
}
@ -201,8 +219,8 @@ static void event_cb(int fd, short kind, void *userp)
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);
if(evtimer_pending(&g->timer_event, NULL)) {
evtimer_del(&g->timer_event);
}
}
}
@ -210,12 +228,10 @@ static void event_cb(int fd, short kind, void *userp)
/* Called by libevent when our timeout expires */
static void timer_cb(int fd, short kind, void *userp)
static void timer_cb(int fd _Unused, short kind _Unused, 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);
@ -229,8 +245,7 @@ static void timer_cb(int fd, short kind, void *userp)
static void remsock(SockInfo *f)
{
if(f) {
if(f->evset)
event_free(f->ev);
event_del(&f->ev);
free(f);
}
}
@ -247,11 +262,9 @@ static void setsock(SockInfo *f, curl_socket_t s, CURL *e, int act,
f->sockfd = s;
f->action = act;
f->easy = e;
if(f->evset)
event_free(f->ev);
f->ev = event_new(g->evbase, f->sockfd, kind, event_cb, g);
f->evset = 1;
event_add(f->ev, NULL);
event_del(&f->ev);
event_assign(&f->ev, g->evbase, f->sockfd, kind, event_cb, g);
event_add(&f->ev, NULL);
}
@ -297,23 +310,20 @@ static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
/* CURLOPT_WRITEFUNCTION */
static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *data)
static size_t write_cb(void *ptr _Unused, size_t size, size_t nmemb, void *data)
{
size_t realsize = size * nmemb;
ConnInfo *conn = (ConnInfo*) data;
(void)ptr;
(void)conn;
ConnInfo *conn _Unused = (ConnInfo*) data;
return realsize;
}
/* CURLOPT_PROGRESSFUNCTION */
static int prog_cb(void *p, double dltotal, double dlnow, double ult,
double uln)
static int prog_cb(void *p, double dltotal, double dlnow, double ult _Unused,
double uln _Unused)
{
ConnInfo *conn = (ConnInfo *)p;
(void)ult;
(void)uln;
fprintf(MSG_OUT, "Progress: %s (%g/%g)\n", conn->url, dlnow, dltotal);
return 0;
@ -346,6 +356,7 @@ static void new_conn(char *url, GlobalInfo *g)
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);
curl_easy_setopt(conn->easy, CURLOPT_FOLLOWLOCATION, 1L);
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);
@ -356,20 +367,23 @@ static void new_conn(char *url, GlobalInfo *g)
}
/* This gets called whenever data is received from the fifo */
static void fifo_cb(int fd, short event, void *arg)
static void fifo_cb(int fd _Unused, short event _Unused, 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]) {
if (!strcmp(s, "stop")) {
g->stopped = 1;
if (g->still_running == 0)
event_base_loopbreak(g->evbase);
} else
new_conn(s, arg); /* if we read a URL, go get it! */
}
else
@ -405,29 +419,27 @@ static int init_fifo(GlobalInfo *g)
g->input = fdopen(sockfd, "r");
fprintf(MSG_OUT, "Now, pipe some URL's into > %s\n", fifo);
g->fifo_event = event_new(g->evbase, sockfd, EV_READ|EV_PERSIST, fifo_cb, g);
event_add(g->fifo_event, NULL);
event_assign(&g->fifo_event, g->evbase, sockfd, EV_READ|EV_PERSIST, fifo_cb, g);
event_add(&g->fifo_event, NULL);
return (0);
}
static void clean_fifo(GlobalInfo *g)
{
event_free(g->fifo_event);
event_del(&g->fifo_event);
fclose(g->input);
unlink(fifo);
}
int main(int argc, char **argv)
int main(int argc _Unused, char **argv _Unused)
{
GlobalInfo g;
(void)argc;
(void)argv;
memset(&g, 0, sizeof(GlobalInfo));
g.evbase = event_base_new();
init_fifo(&g);
g.multi = curl_multi_init();
g.timer_event = evtimer_new(g.evbase, timer_cb, &g);
evtimer_assign(&g.timer_event, g.evbase, timer_cb, &g);
/* setup the generic multi interface options we want */
curl_multi_setopt(g.multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
@ -443,7 +455,7 @@ int main(int argc, char **argv)
/* this, of course, won't get called since only way to stop this program is
via ctrl-C, but it is here to show how cleanup /would/ be done. */
clean_fifo(&g);
event_free(g.timer_event);
event_del(&g.timer_event);
event_base_free(g.evbase);
curl_multi_cleanup(g.multi);
return 0;