event/net/PingClient: remove the timeout feature

Anybody using this class shall implement their own timeout.

demo/net/RunPing.cxx

@@ -20,10 +20,6 @@ class MyPingClientHandler final : public PingClientHandler {
 		printf("ok\n");
 	}
 
-	void PingTimeout() noexcept override {
-		fprintf(stderr, "timeout\n");
-	}
-
 	void PingError(std::exception_ptr ep) noexcept override {
 		PrintException(ep);
 	}

src/event/net/PingClient.cxx

@@ -26,7 +26,6 @@
 PingClient::PingClient(EventLoop &event_loop,
 		       PingClientHandler &_handler) noexcept
 	:event(event_loop, BIND_THIS_METHOD(EventCallback)),
-	 timeout_event(event_loop, BIND_THIS_METHOD(OnTimeout)),
 	 handler(_handler)
 {
 }
@@ -35,7 +34,6 @@ inline void
 PingClient::ScheduleRead() noexcept
 {
 	event.ScheduleRead();
-	timeout_event.Schedule(std::chrono::seconds(10));
 }
 
 static bool
@@ -73,12 +71,10 @@ PingClient::Read() noexcept
 	if (cc >= 0) {
 		if (parse_reply(header, payload, cc, ident)) {
 			event.Close();
-			timeout_event.Cancel();
 			handler.PingResponse();
 		}
 	} else if (const auto e = GetSocketError(); !IsSocketErrorReceiveWouldBlock(e)) {
 		event.Close();
-		timeout_event.Cancel();
 		handler.PingError(std::make_exception_ptr(MakeSocketError(e, "Failed to receive ping reply")));
 	}
 }
@@ -97,15 +93,6 @@ PingClient::EventCallback(unsigned) noexcept
 	Read();
 }
 
-inline void
-PingClient::OnTimeout() noexcept
-{
-	assert(event.IsDefined());
-
-	event.Close();
-	handler.PingTimeout();
-}
-
 /*
  * constructor
  *

src/event/net/PingClient.hxx

@@ -5,14 +5,12 @@
 #pragma once
 
 #include "event/SocketEvent.hxx"
-#include "event/CoarseTimerEvent.hxx"
 
 #include <exception>
 
 class PingClientHandler {
 public:
 	virtual void PingResponse() noexcept = 0;
-	virtual void PingTimeout() noexcept = 0;
 	virtual void PingError(std::exception_ptr ep) noexcept = 0;
 };
 
@@ -22,7 +20,6 @@ public:
  */
 class PingClient final {
 	SocketEvent event;
-	CoarseTimerEvent timeout_event;
 
 	PingClientHandler &handler;
 
@@ -49,14 +46,12 @@ public:
 	void Start(SocketAddress address) noexcept;
 
 	void Cancel() noexcept {
-		timeout_event.Cancel();
 		event.Close();
 	}
 
 private:
 	void ScheduleRead() noexcept;
 	void EventCallback(unsigned events) noexcept;
-	void OnTimeout() noexcept;
 
 	void Read() noexcept;
 };