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#include "WsClient.h"
#include <memory>
#include <unordered_set>
struct ClientContext
{
std::unordered_set<std::string> channels_;
std::shared_ptr<nosql::RedisSubscriber> subscriber_;
};
void WsClient::handleNewMessage(const WebSocketConnectionPtr &wsConnPtr,
std::string &&message,
const WebSocketMessageType &type)
{
if (type == WebSocketMessageType::Ping ||
type == WebSocketMessageType::Pong ||
type == WebSocketMessageType::Close)
{
return;
}
if (type != WebSocketMessageType::Text)
{
LOG_ERROR << "Unsupported message type " << (int)type;
return;
}
LOG_DEBUG << "WsClient new message from "
<< wsConnPtr->peerAddr().toIpPort();
auto context = wsConnPtr->getContext<ClientContext>();
if (!context)
{
auto pos = message.find(' ');
if (pos == std::string::npos)
{
wsConnPtr->send("Invalid publish message.");
return;
}
std::string channel = message.substr(0, pos);
std::string msg = message.substr(pos + 1);
LOG_INFO << "PUBLISH " << channel << " " << msg;
// Publisher
drogon::app().getRedisClient()->execCommandAsync(
[wsConnPtr](const nosql::RedisResult &result) {
std::string nSubs = std::to_string(result.asInteger());
LOG_INFO << "PUBLISH success to " << nSubs << " subscribers.";
wsConnPtr->send("PUBLISH success to " + nSubs +
" subscribers.");
},
[wsConnPtr](const nosql::RedisException &ex) {
LOG_INFO << "PUBLISH failed, " << ex.what();
wsConnPtr->send(std::string("PUBLISH failed: ") + ex.what());
},
"PUBLISH %s %s",
channel.c_str(),
msg.c_str());
return;
}
std::string channel = std::move(message);
if (channel.empty())
{
wsConnPtr->send("Channel not provided");
return;
}
bool subscribe = true;
if (channel.compare(0, 6, "unsub ") == 0)
{
channel = channel.substr(6);
subscribe = false;
}
if (subscribe)
{
if (context->channels_.find(channel) != context->channels_.end())
{
wsConnPtr->send("Already subscribed to channel " + channel);
return;
}
context->subscriber_->subscribe(
channel,
[channel, wsConnPtr](const std::string &subChannel,
const std::string &subMessage) {
assert(subChannel == channel);
LOG_INFO << "Receive channel message " << subMessage;
std::string resp = "{\"channel\":\"" + subChannel +
"\",\"message\":\"" + subMessage + "\"}";
wsConnPtr->send(resp);
});
context->channels_.insert(channel);
wsConnPtr->send("Subscribe to channel: " + channel);
}
else
{
if (context->channels_.find(channel) == context->channels_.end())
{
wsConnPtr->send("Channel not subscribed.");
return;
}
context->channels_.erase(channel);
context->subscriber_->unsubscribe(channel);
wsConnPtr->send("Unsubscribe from channel: " + channel);
}
}
void WsClient::handleNewConnection(const HttpRequestPtr &req,
const WebSocketConnectionPtr &wsConnPtr)
{
if (req->getPath() == "/sub")
{
LOG_DEBUG << "WsClient new subscriber connection from "
<< wsConnPtr->peerAddr().toIpPort();
std::shared_ptr<ClientContext> context =
std::make_shared<ClientContext>();
context->subscriber_ = drogon::app().getRedisClient()->newSubscriber();
wsConnPtr->setContext(context);
}
else
{
LOG_DEBUG << "WsClient new publisher connection from "
<< wsConnPtr->peerAddr().toIpPort();
}
}
void WsClient::handleConnectionClosed(const WebSocketConnectionPtr &wsConnPtr)
{
LOG_DEBUG << "WsClient close connection from "
<< wsConnPtr->peerAddr().toIpPort();
// Channels will be auto unsubscribed when subscriber destructed.
// auto context = wsConnPtr->getContext<ClientContext>();
// for (auto& channel : context->channels_)
// {
// context->subscriber_->unsubscribe(channel);
// }
wsConnPtr->clearContext();
}
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