From 9af1574d6e65bac7b39e7036056cb326064f1ac4 Mon Sep 17 00:00:00 2001
From: Pieter Noordhuis <pcnoordhuis@gmail.com>
Date: Wed, 1 Dec 2010 13:47:58 +0100
Subject: Add adapter for the Redis-bundled ae event library

---
 Makefile      |  9 ++++++
 adapters/ae.h | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 example-ae.c  | 46 +++++++++++++++++++++++++++++
 3 files changed, 150 insertions(+)
 create mode 100644 adapters/ae.h
 create mode 100644 example-ae.c

diff --git a/Makefile b/Makefile
index ab40baa..124f235 100644
--- a/Makefile
+++ b/Makefile
@@ -64,6 +64,15 @@ hiredis-example-libevent: example-libevent.c adapters/libevent.h ${DYLIBNAME}
 hiredis-example-libev: example-libev.c adapters/libev.h ${DYLIBNAME}
 	$(CC) -o $@ $(CCOPT) $(DEBUG) -L. -lhiredis -lev -Wl,-rpath,. example-libev.c
 
+ifndef AE_DIR
+hiredis-example-ae:
+	@echo "Please specify AE_DIR (e.g. <redis repository>/src)"
+	@false
+else
+hiredis-example-ae: example-ae.c adapters/ae.h ${DYLIBNAME}
+	$(CC) -o $@ $(CCOPT) $(DEBUG) -I$(AE_DIR) -L. -lhiredis -Wl,-rpath,. example-ae.c $(AE_DIR)/ae.o $(AE_DIR)/zmalloc.o
+endif
+
 hiredis-%: %.o ${DYLIBNAME}
 	$(CC) -o $@ $(CCOPT) $(DEBUG) -L. -lhiredis -Wl,-rpath,. $<
 
diff --git a/adapters/ae.h b/adapters/ae.h
new file mode 100644
index 0000000..8d0b526
--- /dev/null
+++ b/adapters/ae.h
@@ -0,0 +1,95 @@
+#include <sys/types.h>
+#include <ae.h>
+#include "../hiredis.h"
+#include "../async.h"
+
+typedef struct redisAeEvents {
+    redisAsyncContext *context;
+    aeEventLoop *loop;
+    int fd;
+    int reading, writing;
+} redisAeEvents;
+
+void redisAeReadEvent(aeEventLoop *el, int fd, void *privdata, int mask) {
+    ((void)el); ((void)fd); ((void)mask);
+
+    redisAeEvents *e = (redisAeEvents*)privdata;
+    redisAsyncHandleRead(e->context);
+}
+
+void redisAeWriteEvent(aeEventLoop *el, int fd, void *privdata, int mask) {
+    ((void)el); ((void)fd); ((void)mask);
+
+    redisAeEvents *e = (redisAeEvents*)privdata;
+    redisAsyncHandleWrite(e->context);
+}
+
+void redisAeAddRead(void *privdata) {
+    redisAeEvents *e = (redisAeEvents*)privdata;
+    aeEventLoop *loop = e->loop;
+    if (!e->reading) {
+        e->reading = 1;
+        aeCreateFileEvent(loop,e->fd,AE_READABLE,redisAeReadEvent,e);
+    }
+}
+
+void redisAeDelRead(void *privdata) {
+    redisAeEvents *e = (redisAeEvents*)privdata;
+    aeEventLoop *loop = e->loop;
+    if (e->reading) {
+        e->reading = 0;
+        aeDeleteFileEvent(loop,e->fd,AE_READABLE);
+    }
+}
+
+void redisAeAddWrite(void *privdata) {
+    redisAeEvents *e = (redisAeEvents*)privdata;
+    aeEventLoop *loop = e->loop;
+    if (!e->writing) {
+        e->writing = 1;
+        aeCreateFileEvent(loop,e->fd,AE_WRITABLE,redisAeWriteEvent,e);
+    }
+}
+
+void redisAeDelWrite(void *privdata) {
+    redisAeEvents *e = (redisAeEvents*)privdata;
+    aeEventLoop *loop = e->loop;
+    if (e->writing) {
+        e->writing = 0;
+        aeDeleteFileEvent(loop,e->fd,AE_WRITABLE);
+    }
+}
+
+void redisAeCleanup(void *privdata) {
+    redisAeEvents *e = (redisAeEvents*)privdata;
+    redisAeDelRead(privdata);
+    redisAeDelWrite(privdata);
+    free(e);
+}
+
+int redisAeAttach(aeEventLoop *loop, redisAsyncContext *ac) {
+    redisContext *c = &(ac->c);
+    redisAeEvents *e;
+
+    /* Nothing should be attached when something is already attached */
+    if (ac->data != NULL)
+        return REDIS_ERR;
+
+    /* Create container for context and r/w events */
+    e = (redisAeEvents*)malloc(sizeof(*e));
+    e->context = ac;
+    e->loop = loop;
+    e->fd = c->fd;
+    e->reading = e->writing = 0;
+
+    /* Register functions to start/stop listening for events */
+    ac->evAddRead = redisAeAddRead;
+    ac->evDelRead = redisAeDelRead;
+    ac->evAddWrite = redisAeAddWrite;
+    ac->evDelWrite = redisAeDelWrite;
+    ac->evCleanup = redisAeCleanup;
+    ac->data = e;
+
+    return REDIS_OK;
+}
+
diff --git a/example-ae.c b/example-ae.c
new file mode 100644
index 0000000..fc471fb
--- /dev/null
+++ b/example-ae.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include "hiredis.h"
+#include "async.h"
+#include "adapters/ae.h"
+
+/* Put event loop in the global scope, so it can be explicitly stopped */
+static aeEventLoop *loop;
+
+void getCallback(redisAsyncContext *c, void *r, void *privdata) {
+    redisReply *reply = r;
+    if (reply == NULL) return;
+    printf("argv[%s]: %s\n", (char*)privdata, reply->str);
+
+    /* Disconnect after receiving the reply to GET */
+    redisAsyncDisconnect(c);
+}
+
+void disconnectCallback(const redisAsyncContext *c, int status) {
+    if (status != REDIS_OK) {
+        printf("Error: %s\n", c->errstr);
+    }
+    aeStop(loop);
+}
+
+int main (int argc, char **argv) {
+    signal(SIGPIPE, SIG_IGN);
+
+    redisAsyncContext *c = redisAsyncConnect("127.0.0.1", 6379);
+    if (c->err) {
+        /* Let *c leak for now... */
+        printf("Error: %s\n", c->errstr);
+        return 1;
+    }
+
+    loop = aeCreateEventLoop();
+    redisAeAttach(loop, c);
+    redisAsyncSetDisconnectCallback(c,disconnectCallback);
+    redisAsyncCommand(c, NULL, NULL, "SET key %b", argv[argc-1], strlen(argv[argc-1]));
+    redisAsyncCommand(c, getCallback, (char*)"end-1", "GET key");
+    aeMain(loop);
+    return 0;
+}
+
-- 
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