subscriber.cpp
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/**
* Redox - A modern, asynchronous, and wicked fast C++11 client for Redis
*
* https://github.com/hmartiro/redox
*
* Copyright 2015 - Hayk Martirosyan <hayk.mart at gmail dot com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <string.h>
#include "subscriber.hpp"
using namespace std;
namespace redox {
Subscriber::Subscriber(
const std::string& host, const int port,
std::function<void(int)> connection_callback,
std::ostream& log_stream, log::Level log_level
) : rdx_(host, port, connection_callback, log_stream, log_level),
logger_(rdx_.logger_) {}
Subscriber::Subscriber(
const std::string& path,
std::function<void(int)> connection_callback,
std::ostream& log_stream, log::Level log_level
) : rdx_(path, connection_callback, log_stream, log_level),
logger_(rdx_.logger_) {}
// For debugging only
void debugReply(Command<redisReply*> c) {
redisReply* reply = c.reply();
cout << "------" << endl;
cout << c.cmd() << " " << (reply->type == REDIS_REPLY_ARRAY) << " " << (reply->elements) << endl;
for(size_t i = 0; i < reply->elements; i++) {
redisReply* r = reply->element[i];
cout << "element " << i << ", reply type = " << r->type << " ";
if(r->type == REDIS_REPLY_STRING) cout << r->str << endl;
else if(r->type == REDIS_REPLY_INTEGER) cout << r->integer << endl;
else cout << "some other type" << endl;
}
cout << "------" << endl;
}
void Subscriber::subscribeBase(const string cmd_name, const string topic,
function<void(const string&, const string&)> msg_callback,
function<void(const string&)> sub_callback,
function<void(const string&)> unsub_callback,
function<void(const string&, int)> err_callback
) {
rdx_.commandLoop<redisReply*>(cmd_name + " " + topic,
[this, topic, msg_callback, err_callback, sub_callback, unsub_callback](Command<redisReply*>& c) {
if (!c.ok()) {
if (err_callback) err_callback(topic, c.status());
return;
}
redisReply* reply = c.reply();
// TODO cancel this command on unsubscription?
// If the last entry is an integer, then it is a [p]sub/[p]unsub command
if ((reply->type == REDIS_REPLY_ARRAY) &&
(reply->element[reply->elements - 1]->type == REDIS_REPLY_INTEGER)) {
if (!strncmp(reply->element[0]->str, "sub", 3)) {
subscribed_topics_.insert(topic);
if (sub_callback) sub_callback(topic);
} else if (!strncmp(reply->element[0]->str, "psub", 4)) {
psubscribed_topics_.insert(topic);
if (sub_callback) sub_callback(topic);
} else if (!strncmp(reply->element[0]->str, "uns", 3)) {
subscribed_topics_.erase(topic);
if (unsub_callback) unsub_callback(topic);
} else if (!strncmp(reply->element[0]->str, "puns", 4)) {
psubscribed_topics_.erase(topic);
if (unsub_callback) unsub_callback(topic);
}
else logger_.error() << "Unknown pubsub message: " << reply->element[0]->str;
}
// Message for subscribe
else if ((reply->type == REDIS_REPLY_ARRAY) && (reply->elements == 3)) {
char* msg = reply->element[2]->str;
if (msg && msg_callback) msg_callback(topic, reply->element[2]->str);
}
// Message for psubscribe
else if ((reply->type == REDIS_REPLY_ARRAY) && (reply->elements == 4)) {
char* msg = reply->element[2]->str;
if (msg && msg_callback) msg_callback(reply->element[2]->str, reply->element[3]->str);
}
else logger_.error() << "Unknown pubsub message of type " << reply->type;
},
1e10 // To keep the command around for a few hundred years
);
}
void Subscriber::subscribe(const string topic,
function<void(const string&, const string&)> msg_callback,
function<void(const string&)> sub_callback,
function<void(const string&)> unsub_callback,
function<void(const string&, int)> err_callback
) {
if(subscribed_topics_.find(topic) != subscribed_topics_.end()) {
logger_.warning() << "Already subscribed to " << topic << "!";
return;
}
subscribeBase("SUBSCRIBE", topic, msg_callback, sub_callback, unsub_callback, err_callback);
}
void Subscriber::psubscribe(const string topic,
function<void(const string&, const string&)> msg_callback,
function<void(const string&)> sub_callback,
function<void(const string&)> unsub_callback,
function<void(const string&, int)> err_callback
) {
if(psubscribed_topics_.find(topic) != psubscribed_topics_.end()) {
logger_.warning() << "Already psubscribed to " << topic << "!";
return;
}
subscribeBase("PSUBSCRIBE", topic, msg_callback, sub_callback, unsub_callback, err_callback);
}
void Subscriber::unsubscribeBase(const string cmd_name, const string topic,
function<void(const string&, int)> err_callback
) {
rdx_.command<redisReply*>(cmd_name + " " + topic,
[topic, err_callback](Command<redisReply*>& c) {
if(!c.ok()) {
if (err_callback) err_callback(topic, c.status());
}
}
);
}
void Subscriber::unsubscribe(const string topic,
function<void(const string&, int)> err_callback
) {
if(subscribed_topics_.find(topic) == subscribed_topics_.end()) {
logger_.warning() << "Cannot unsubscribe from " << topic << ", not subscribed!";
return;
}
unsubscribeBase("UNSUBSCRIBE", topic, err_callback);
}
void Subscriber::punsubscribe(const string topic,
function<void(const string&, int)> err_callback
) {
if(psubscribed_topics_.find(topic) == psubscribed_topics_.end()) {
logger_.warning() << "Cannot punsubscribe from " << topic << ", not psubscribed!";
return;
}
unsubscribeBase("PUNSUBSCRIBE", topic, err_callback);
}
} // End namespace