log: fix LogMethod copy

include/opendht/log_enable.h

@@ -43,8 +43,23 @@ inline void NOLOG(char const*, va_list) {}
 struct LogMethod {
     LogMethod() = default;
 
+    LogMethod(LogMethod&& l) : func(std::move(l.func)) {}
+    LogMethod(const LogMethod& l) : func(l.func) {}
+
+    LogMethod& operator=(dht::LogMethod&& l) {
+        func = std::forward<LogMethod>(l.func);
+        return *this;
+    }
+    LogMethod& operator=(const dht::LogMethod& l) {
+        func = l.func;
+        return *this;
+    }
+
     template<typename T>
-    LogMethod(T&& t) : func(std::forward<T>(t)) {}
+    explicit LogMethod(T&& t) : func(std::forward<T>(t)) {}
+
+    template<typename T>
+    LogMethod(const T& t) : func(t) {}
 
     void operator()(char const* format, ...) const {
         va_list args;

include/opendht/securedht.h

@@ -315,7 +315,7 @@ public:
         DHT_LOG.DEBUG = debug;
         DHT_LOG.WARN = warn;
         DHT_LOG.ERR = error;
-        dht_->setLoggers(std::forward<LogMethod>(error), std::forward<LogMethod>(warn), std::forward<LogMethod>(debug));
+        dht_->setLoggers(error, warn, debug);
     }
 
     /**

src/dht_proxy_client.cpp

@@ -571,13 +571,14 @@ DhtProxyClient::getProxyInfos()
 void
 DhtProxyClient::onProxyInfos(const Json::Value& proxyInfos, sa_family_t family)
 {
-    DHT_LOG.d("Got proxy infos %s", family == AF_INET ? "IPv4" : "IPv6");
     std::lock_guard<std::mutex> l(lockCurrentProxyInfos_);
     auto oldStatus = std::max(statusIpv4_, statusIpv6_);
     auto& status = family == AF_INET ? statusIpv4_ : statusIpv6_;
     if (not proxyInfos.isMember("node_id")) {
+        DHT_LOG.e("Proxy info request failed for %s", family == AF_INET ? "IPv4" : "IPv6");
         status = NodeStatus::Disconnected;
     } else {
+        DHT_LOG.d("Got proxy reply for %s", family == AF_INET ? "IPv4" : "IPv6");
         try {
             myid = InfoHash(proxyInfos["node_id"].asString());
             stats4_ = NodeStats(proxyInfos["ipv4"]);

src/dhtrunner.cpp

@@ -247,10 +247,10 @@ void
 DhtRunner::setLoggers(LogMethod error, LogMethod warn, LogMethod debug) {
     std::lock_guard<std::mutex> lck(dht_mtx);
     if (dht_)
-        dht_->setLoggers(std::forward<LogMethod>(error), std::forward<LogMethod>(warn), std::forward<LogMethod>(debug));
+        dht_->setLoggers(error, warn, debug);
 #if OPENDHT_PROXY_CLIENT
     if (dht_via_proxy_)
-        dht_via_proxy_->setLoggers(std::forward<LogMethod>(error), std::forward<LogMethod>(warn), std::forward<LogMethod>(debug));
+        dht_via_proxy_->setLoggers(error, warn, debug);
 #endif
 }