Add a timeout to scgi tasks.

A hundred connections sending a partial header held the whole task pool.

src/rpc/scgi_task.h

@@ -1,10 +1,12 @@
 #ifndef RTORRENT_RPC_SCGI_TASK_H
 #define RTORRENT_RPC_SCGI_TASK_H
 
+#include <chrono>
 #include <memory>
 #include <mutex>
 #include <vector>
 #include <torrent/system/event.h>
+#include <torrent/system/scheduler.h>
 
 namespace rpc {
 
@@ -16,6 +18,8 @@ public:
   static constexpr int max_header_size     = 2000;
   static constexpr int max_content_size    = (2 << 23);
 
+  static constexpr auto timeout_request = std::chrono::seconds(60);
+
   enum ContentType { XML, JSON };
 
   SCgiTask();
@@ -54,8 +58,9 @@ private:
   void                plaintext_response(const char* buffer, uint32_t content_length);
   void                gzip_response(const char* buffer, uint32_t content_length);
 
-  SCgi*                        m_parent{};
-  torrent::system::callback_id m_callback_id;
+  SCgi*                           m_parent{};
+  torrent::system::callback_id    m_callback_id;
+  torrent::system::SchedulerEntry m_task_timeout;
 
   std::mutex          m_result_mutex;