client: log timeout with debug level

Currently, we log that timeout is exceeded with error level. The problem
is there are no dedicated methods for polling so users have to use
`wait` methods, and when they use them, they spam timeout errors.
Anyway, we return -1 on timeout, so users can log timeouts on their own.

Closes #109

Author: drewdzzz

src/Client/Connector.hpp

@@ -209,7 +209,7 @@ Connector<BUFFER, NetProvider>::wait(Connection<BUFFER, NetProvider> &conn,
 		return -1;
 	}
 	if (! conn.futureIsReady(future)) {
-		LOG_ERROR("Connection has been timed out: future ", future,
+		LOG_DEBUG("Connection has been timed out: future ", future,
 			  " is not ready");
 		return -1;
 	}
@@ -254,7 +254,7 @@ Connector<BUFFER, NetProvider>::waitAll(Connection<BUFFER, NetProvider> &conn,
 		LOG_ERROR("Connection got an error: ", conn.getError().msg);
 		return -1;
 	}
-	LOG_ERROR("Connection has been timed out: not all futures are ready");
+	LOG_DEBUG("Connection has been timed out: not all futures are ready");
 	return -1;
 }
 
@@ -267,7 +267,7 @@ Connector<BUFFER, NetProvider>::waitAny(int timeout)
 	while (m_ReadyToDecode.empty() && !timer.isExpired())
 		m_NetProvider.wait(timeout - timer.elapsed());
 	if (m_ReadyToDecode.empty()) {
-		LOG_ERROR("wait() has been timed out! No responses are received");
+		LOG_DEBUG("wait() has been timed out! No responses are received");
 		return std::nullopt;
 	}
 	Connection<BUFFER, NetProvider> conn = *m_ReadyToDecode.begin();
@@ -307,8 +307,8 @@ Connector<BUFFER, NetProvider>::waitCount(Connection<BUFFER, NetProvider> &conn,
 		LOG_ERROR("Connection got an error: ", conn.getError().msg);
 		return -1;
 	}
-	LOG_ERROR("Connection has been timed out: only ",
-		   conn.getFutureCount() - ready_futures, " are ready");
+	LOG_DEBUG("Connection has been timed out: only ",
+		  conn.getFutureCount() - ready_futures, " are ready");
 	return -1;
 }
 

src/Client/LibevNetProvider.hpp

@@ -354,7 +354,7 @@ void
 LibevNetProvider<BUFFER, Stream>::timeout_cb(EV_P_ ev_timer *w, int /* revents */)
 {
 	(void) w;
-	LOG_ERROR("Libev timed out!");
+	LOG_DEBUG("Libev timed out!");
 	/* Stop external loop */
 	ev_break(EV_A_ EVBREAK_ONE);
 }