proxy server: send push notification on thread pool

include/opendht/dht_proxy_server.h

@@ -45,6 +45,7 @@ namespace Json {
 namespace dht {
 
 class DhtRunner;
+class ThreadPool;
 
 /**
  * Describes the REST API
@@ -277,6 +278,7 @@ private:
     std::condition_variable schedulerCv_;
     Scheduler scheduler_;
     std::thread schedulerThread_;
+    std::unique_ptr<ThreadPool> threadPool_;
 
     Sp<Scheduler::Job> printStatsJob_;
     mutable std::mutex statsMutex_;

src/dht_proxy_server.cpp

@@ -20,6 +20,7 @@
 #if OPENDHT_PROXY_SERVER
 #include "dht_proxy_server.h"
 
+#include "thread_pool.h"
 #include "default_types.h"
 #include "dhtrunner.h"
 
@@ -47,9 +48,11 @@ struct DhtProxyServer::SearchPuts {
 };
 
 constexpr const std::chrono::minutes PRINT_STATS_PERIOD {2};
+constexpr const size_t IO_THREADS_MAX {64};
+
 
 DhtProxyServer::DhtProxyServer(std::shared_ptr<DhtRunner> dht, in_port_t port , const std::string& pushServer)
-: dht_(dht) , pushServer_(pushServer)
+: dht_(dht), threadPool_(new ThreadPool(IO_THREADS_MAX)), pushServer_(pushServer)
 {
     if (not dht_)
         throw std::invalid_argument("A DHT instance must be provided");
@@ -177,6 +180,7 @@ DhtProxyServer::stop()
         schedulerThread_.join();
     if (server_thread.joinable())
         server_thread.join();
+    threadPool_->stop();
 }
 
 void
@@ -441,9 +445,7 @@ DhtProxyServer::subscribe(const std::shared_ptr<restbed::Session>& session)
                                         Json::StreamWriterBuilder wbuilder;
                                         wbuilder["commentStyle"] = "None";
                                         wbuilder["indentation"] = "";
-                                        auto output = Json::writeString(
-                                                            wbuilder, value->toJson()) +
-                                                        "\n";
+                                        auto output = Json::writeString(wbuilder, value->toJson()) + "\n";
                                         s->yield(output, [](const Sp<restbed::Session>
                                                                 & /*session*/) {});
                                         return true;
@@ -473,12 +475,14 @@ DhtProxyServer::subscribe(const std::shared_ptr<restbed::Session>& session)
 
                     // The listener is not found, so add it.
                     listener.internalToken = dht_->listen(infoHash,
-                        [this, infoHash, pushToken, isAndroid, clientId](std::vector<std::shared_ptr<Value>> /*value*/) {
-                            // Build message content.
+                        [this, infoHash, pushToken, isAndroid, clientId](const std::vector<std::shared_ptr<Value>>& /*values*/) {
+                            threadPool_->run([this, infoHash, pushToken, isAndroid, clientId](){
+                                // Build message content
                                 Json::Value json;
                                 json["key"] = infoHash.toString();
                                 json["to"] = clientId;
                                 sendPushNotification(pushToken, std::move(json), isAndroid);
+                            });
                             return true;
                         }
                     );