just log useful exceptions

shadowsocks-csharp/Controller/Local.cs

@@ -144,7 +144,7 @@ namespace Shadowsocks.Controller
             }
             catch (Exception e)
             {
-                Console.WriteLine(e);
+                Logging.LogUsefulException(e);
                 this.Close();
             }
         }
@@ -176,7 +176,7 @@ namespace Shadowsocks.Controller
                 }
                 catch (Exception e)
                 {
-                    Console.WriteLine(e);
+                    Logging.LogUsefulException(e);
                 }
             }
             if (remote != null)
@@ -188,7 +188,7 @@ namespace Shadowsocks.Controller
                 }
                 catch (SocketException e)
                 {
-                    Console.WriteLine(e);
+                    Logging.LogUsefulException(e);
                 }
             }
             lock (encryptionLock)
@@ -218,7 +218,7 @@ namespace Shadowsocks.Controller
             }
             catch (Exception e)
             {
-                Console.WriteLine(e);
+                Logging.LogUsefulException(e);
                 this.Close();
             }
         }
@@ -236,7 +236,7 @@ namespace Shadowsocks.Controller
             }
             catch (Exception e)
             {
-                Console.WriteLine(e);
+                Logging.LogUsefulException(e);
                 this.Close();
             }
         }
@@ -269,7 +269,7 @@ namespace Shadowsocks.Controller
             }
             catch (Exception e)
             {
-                Console.WriteLine(e);
+                Logging.LogUsefulException(e);
                 this.Close();
             }
         }
@@ -296,7 +296,7 @@ namespace Shadowsocks.Controller
             }
             catch (Exception e)
             {
-                Console.WriteLine(e);
+                Logging.LogUsefulException(e);
                 this.Close();
             }
         }
@@ -324,7 +324,7 @@ namespace Shadowsocks.Controller
             }
             catch (Exception e)
             {
-                Console.WriteLine(e);
+                Logging.LogUsefulException(e);
                 this.Close();
             }
         }
@@ -346,7 +346,7 @@ namespace Shadowsocks.Controller
             }
             catch (Exception e)
             {
-                Console.WriteLine(e);
+                Logging.LogUsefulException(e);
                 this.Close();
             }
         }
@@ -384,7 +384,7 @@ namespace Shadowsocks.Controller
             }
             catch (Exception e)
             {
-                Console.WriteLine(e);
+                Logging.LogUsefulException(e);
                 this.Close();
             }
         }
@@ -421,7 +421,7 @@ namespace Shadowsocks.Controller
             }
             catch (Exception e)
             {
-                Console.WriteLine(e);
+                Logging.LogUsefulException(e);
                 this.Close();
             }
         }
@@ -440,7 +440,7 @@ namespace Shadowsocks.Controller
             }
             catch (Exception e)
             {
-                Console.WriteLine(e);
+                Logging.LogUsefulException(e);
                 this.Close();
             }
         }
@@ -459,7 +459,7 @@ namespace Shadowsocks.Controller
             }
             catch (Exception e)
             {
-                Console.WriteLine(e);
+                Logging.LogUsefulException(e);
                 this.Close();
             }
         }

shadowsocks-csharp/Controller/Logging.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Net.Sockets;
 using System.Text;
 
 namespace Shadowsocks.Controller
@@ -30,5 +31,31 @@ namespace Shadowsocks.Controller
                 return false;
             }
         }
+
+        public static void LogUsefulException(Exception e)
+        {
+            // just log useful exceptions, not all of them
+            if (e is SocketException)
+            {
+                SocketException se = (SocketException)e;
+                if (se.SocketErrorCode == SocketError.ConnectionAborted)
+                {
+                    // closed by browser when sending
+                    // normally happens when download is canceled or a tab is closed before page is loaded
+                }
+                else if (se.SocketErrorCode == SocketError.ConnectionReset)
+                {
+                    // received rst
+                }
+                else
+                {
+                    Console.WriteLine(e);
+                }
+            }
+            else
+            {
+                Console.WriteLine(e);
+            }
+        }
     }
 }