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hiredis pubsub example
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/*Example code for pub/sub | |
run as publisher | |
./pubsub pub <channelName> <message> | |
run as subscriber | |
./pubsub sub <channelName>*/ | |
/*---------------------- | |
Publish and Subscribe | |
------------------------*/ | |
#include <signal.h> | |
#include <iostream> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string> | |
#include <hiredis/hiredis.h> | |
#include <hiredis/async.h> | |
#include <hiredis/adapters/libevent.h> | |
using namespace std; | |
void subCallback(redisAsyncContext *c, void *r, void *privdata) { | |
redisReply *reply = (redisReply*)r; | |
if (reply == NULL){ | |
cout<<"Response not recev"<<endl; | |
return; | |
} | |
if(reply->type == REDIS_REPLY_ARRAY & reply->elements == 3) | |
{ | |
if(strcmp( reply->element[0]->str,"subscribe") != 0) | |
{ | |
cout<<"Message received -> "<< | |
reply->element[2]->str<<"( on channel : "<<reply->element[1]->str<<")"<<endl; | |
} | |
} | |
} | |
void pubCallback(redisAsyncContext *c, void *r, void *privdata) { | |
redisReply *reply = (redisReply*)r; | |
if (reply == NULL){ | |
cout<<"Response not recev"<<endl; | |
return; | |
} | |
cout<<"message published"<<endl; | |
redisAsyncDisconnect(c); | |
} | |
int main(int argv, char** args) | |
{ | |
string processName(args[1]); | |
signal(SIGPIPE, SIG_IGN); | |
struct event_base* | |
base = event_base_new(); | |
redisAsyncContext* | |
_redisContext = redisAsyncConnect("127.0.0.1", 6379); | |
if (_redisContext->err) { | |
/* Let context leak for now... */ | |
cout<<"Error: "<< _redisContext->errstr<<endl; | |
return 1; | |
} | |
redisLibeventAttach(_redisContext,base); | |
int status; | |
//Act as publisher | |
if(processName.compare("pub") == 0) | |
{ | |
string command ("publish "); | |
command.append(args[2]); | |
command.append (" "); | |
command.append(args[3]); | |
status = redisAsyncCommand(_redisContext, | |
pubCallback, | |
(char*)"pub", command.c_str()); | |
} | |
//Act as subscriber | |
else if(processName.compare("sub") == 0) | |
{ | |
string command ("subscribe "); | |
command.append(args[2]); | |
status = redisAsyncCommand(_redisContext, | |
subCallback, | |
(char*)"sub", command.c_str()); | |
} | |
else | |
cout<<"Try pub or sub"<<endl; | |
event_base_dispatch(base); | |
return 0; | |
} |
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