Polling adapter and example
Kristján Valur Jónsson
parent
8a15f4d657
commit
31c91408ef
5
Makefile
5
Makefile
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@ -4,7 +4,7 @@
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# This file is released under the BSD license, see the COPYING file
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OBJ=alloc.o net.o hiredis.o sds.o async.o read.o sockcompat.o
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EXAMPLES=hiredis-example hiredis-example-libevent hiredis-example-libev hiredis-example-glib hiredis-example-push
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EXAMPLES=hiredis-example hiredis-example-libevent hiredis-example-libev hiredis-example-glib hiredis-example-push hiredis-example-poll
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TESTS=hiredis-test
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LIBNAME=libhiredis
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PKGCONFNAME=hiredis.pc
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@ -192,6 +192,9 @@ hiredis-example-macosx: examples/example-macosx.c adapters/macosx.h $(STLIBNAME)
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hiredis-example-ssl: examples/example-ssl.c $(STLIBNAME) $(SSL_STLIBNAME)
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$(CC) -o examples/$@ $(REAL_CFLAGS) -I. $< $(STLIBNAME) $(SSL_STLIBNAME) $(REAL_LDFLAGS) $(SSL_LDFLAGS)
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hiredis-example-poll: examples/example-poll.c adapters/poll.h $(STLIBNAME)
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$(CC) -o examples/$@ $(REAL_CFLAGS) -I. $< $(STLIBNAME) $(REAL_LDFLAGS)
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ifndef AE_DIR
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hiredis-example-ae:
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@echo "Please specify AE_DIR (e.g. <redis repository>/src)"
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@ -0,0 +1,197 @@
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#ifndef HIREDIS_POLL_H
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#define HIREDIS_POLL_H
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#include "../async.h"
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#include "../sockcompat.h"
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#include <string.h> // for memset
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#include <errno.h>
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/* Values to return from redisPollTick */
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#define REDIS_POLL_HANDLED_READ 1
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#define REDIS_POLL_HANDLED_WRITE 2
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#define REDIS_POLL_HANDLED_TIMEOUT 4
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/* An adapter to allow manual polling of the async context by checking the state
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* of the underlying file descriptor. Useful in cases where there is no formal
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* IO event loop but regular ticking can be used, such as in game engines. */
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typedef struct redisPollEvents {
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redisAsyncContext *context;
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redisFD fd;
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char reading, writing;
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char in_tick;
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char deleted;
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double deadline;
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} redisPollEvents;
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static double redisPollTimevalToDouble(struct timeval *tv) {
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if (tv == NULL)
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return 0.0;
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return tv->tv_sec + tv->tv_usec / 1000000.00;
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}
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static double redisPollGetNow(void) {
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#ifndef _MSC_VER
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struct timeval tv;
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gettimeofday(&tv,NULL);
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return redisPollTimevalToDouble(&tv);
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#else
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FILETIME ft;
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ULARGE_INTEGER li;
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GetSystemTimeAsFileTime(&ft);
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li.HighPart = ft.dwHighDateTime;
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li.LowPart = ft.dwLowDateTime;
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return (double)li.QuadPart * 1e-7;
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#endif
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}
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/* Poll for io, handling any pending callbacks. The timeout argument can be
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* positive to wait for a maximum given time for IO, zero to poll, or negative
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* to wait forever */
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static int redisPollTick(redisAsyncContext *ac, double timeout) {
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int reading, writing;
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struct pollfd pfd;
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int handled;
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int ns;
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int itimeout;
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redisPollEvents *e = (redisPollEvents*)ac->ev.data;
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if (!e)
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return 0;
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/* local flags, won't get changed during callbacks */
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reading = e->reading;
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writing = e->writing;
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if (!reading && !writing)
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return 0;
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pfd.fd = e->fd;
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pfd.events = 0;
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if (reading)
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pfd.events = POLLIN;
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if (writing)
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pfd.events |= POLLOUT;
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if (timeout >= 0.0) {
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itimeout = (int)(timeout * 1000.0);
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} else {
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itimeout = -1;
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}
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ns = poll(&pfd, 1, itimeout);
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if (ns < 0) {
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/* ignore the EINTR error */
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if (errno != EINTR)
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return ns;
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ns = 0;
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}
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handled = 0;
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e->in_tick = 1;
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if (ns) {
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if (reading && (pfd.revents & POLLIN)) {
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redisAsyncHandleRead(ac);
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handled |= REDIS_POLL_HANDLED_READ;
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}
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/* on Windows, connection failure is indicated with the Exception fdset.
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* handle it the same as writable. */
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if (writing && (pfd.revents & (POLLOUT | POLLERR))) {
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/* context Read callback may have caused context to be deleted, e.g.
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by doing an redisAsyncDisconnect() */
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if (!e->deleted) {
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redisAsyncHandleWrite(ac);
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handled |= REDIS_POLL_HANDLED_WRITE;
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}
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}
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}
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/* perform timeouts */
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if (!e->deleted && e->deadline != 0.0) {
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double now = redisPollGetNow();
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if (now >= e->deadline) {
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/* deadline has passed. disable timeout and perform callback */
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e->deadline = 0.0;
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redisAsyncHandleTimeout(ac);
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handled |= REDIS_POLL_HANDLED_TIMEOUT;
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}
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}
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/* do a delayed cleanup if required */
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if (e->deleted)
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hi_free(e);
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else
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e->in_tick = 0;
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return handled;
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}
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static void redisPollAddRead(void *data) {
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redisPollEvents *e = (redisPollEvents*)data;
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e->reading = 1;
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}
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static void redisPollDelRead(void *data) {
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redisPollEvents *e = (redisPollEvents*)data;
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e->reading = 0;
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}
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static void redisPollAddWrite(void *data) {
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redisPollEvents *e = (redisPollEvents*)data;
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e->writing = 1;
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}
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static void redisPollDelWrite(void *data) {
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redisPollEvents *e = (redisPollEvents*)data;
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e->writing = 0;
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}
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static void redisPollCleanup(void *data) {
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redisPollEvents *e = (redisPollEvents*)data;
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/* if we are currently processing a tick, postpone deletion */
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if (e->in_tick)
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e->deleted = 1;
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else
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hi_free(e);
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}
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static void redisPollScheduleTimer(void *data, struct timeval tv)
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{
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redisPollEvents *e = (redisPollEvents*)data;
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double now = redisPollGetNow();
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e->deadline = now + redisPollTimevalToDouble(&tv);
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}
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static int redisPollAttach(redisAsyncContext *ac) {
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redisContext *c = &(ac->c);
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redisPollEvents *e;
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/* Nothing should be attached when something is already attached */
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if (ac->ev.data != NULL)
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return REDIS_ERR;
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/* Create container for context and r/w events */
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e = (redisPollEvents*)hi_malloc(sizeof(*e));
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if (e == NULL)
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return REDIS_ERR;
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memset(e, 0, sizeof(*e));
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e->context = ac;
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e->fd = c->fd;
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e->reading = e->writing = 0;
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e->in_tick = e->deleted = 0;
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e->deadline = 0.0;
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/* Register functions to start/stop listening for events */
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ac->ev.addRead = redisPollAddRead;
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ac->ev.delRead = redisPollDelRead;
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ac->ev.addWrite = redisPollAddWrite;
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ac->ev.delWrite = redisPollDelWrite;
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ac->ev.scheduleTimer = redisPollScheduleTimer;
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ac->ev.cleanup = redisPollCleanup;
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ac->ev.data = e;
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return REDIS_OK;
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}
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#endif /* HIREDIS_POLL_H */
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@ -0,0 +1,62 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <unistd.h>
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#include <async.h>
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#include <adapters/poll.h>
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/* Put in the global scope, so that loop can be explicitly stopped */
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static int exit_loop = 0;
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void getCallback(redisAsyncContext *c, void *r, void *privdata) {
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redisReply *reply = r;
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if (reply == NULL) return;
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printf("argv[%s]: %s\n", (char*)privdata, reply->str);
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/* Disconnect after receiving the reply to GET */
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redisAsyncDisconnect(c);
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}
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void connectCallback(const redisAsyncContext *c, int status) {
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if (status != REDIS_OK) {
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printf("Error: %s\n", c->errstr);
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exit_loop = 1;
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return;
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}
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printf("Connected...\n");
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}
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void disconnectCallback(const redisAsyncContext *c, int status) {
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exit_loop = 1;
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if (status != REDIS_OK) {
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printf("Error: %s\n", c->errstr);
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return;
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}
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printf("Disconnected...\n");
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}
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int main (int argc, char **argv) {
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signal(SIGPIPE, SIG_IGN);
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redisAsyncContext *c = redisAsyncConnect("127.0.0.1", 6379);
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if (c->err) {
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/* Let *c leak for now... */
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printf("Error: %s\n", c->errstr);
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return 1;
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}
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redisPollAttach(c);
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redisAsyncSetConnectCallback(c,connectCallback);
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redisAsyncSetDisconnectCallback(c,disconnectCallback);
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redisAsyncCommand(c, NULL, NULL, "SET key %b", argv[argc-1], strlen(argv[argc-1]));
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redisAsyncCommand(c, getCallback, (char*)"end-1", "GET key");
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while (!exit_loop)
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{
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redisPollTick(c, 0.1);
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}
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return 0;
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}
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