client/BackgroundCommand: infrastructure for commands running in background

src/client/Client.cxx

@@ -18,8 +18,10 @@
  */
 
 #include "Client.hxx"
+#include "Config.hxx"
 #include "Partition.hxx"
 #include "Instance.hxx"
+#include "BackgroundCommand.hxx"
 #include "util/Domain.hxx"
 #include "config.h"
 
@@ -27,6 +29,37 @@ Client::~Client() noexcept
 {
 	if (FullyBufferedSocket::IsDefined())
 		FullyBufferedSocket::Close();
+
+	if (background_command) {
+		background_command->Cancel();
+		background_command.reset();
+	}
+}
+
+void
+Client::SetBackgroundCommand(std::unique_ptr<BackgroundCommand> _bc) noexcept
+{
+	assert(!background_command);
+	assert(_bc);
+
+	background_command = std::move(_bc);
+
+	/* disable timeouts while in "idle" */
+	timeout_event.Cancel();
+}
+
+void
+Client::OnBackgroundCommandFinished() noexcept
+{
+	assert(background_command);
+
+	background_command.reset();
+
+	/* just in case OnSocketInput() has returned
+	   InputResult::PAUSE meanwhile */
+	ResumeInput();
+
+	timeout_event.Schedule(client_timeout);
 }
 
 Instance &