Merge branch 'master' into jsdbg_gdb_support

server/JsDbg.Core/DllImports.cs

@@ -0,0 +1,19 @@
+//--------------------------------------------------------------
+//
+//    MIT License
+//
+//    Copyright (c) Microsoft Corporation. All rights reserved.
+//
+//--------------------------------------------------------------
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace JsDbg.Core {
+    internal class DllImports {
+        [DllImport("shlwapi.dll")]
+        internal static extern bool PathIsNetworkPath(string path);
+    }
+}

server/JsDbg.Core/FileCache.cs

@@ -0,0 +1,55 @@
+//--------------------------------------------------------------
+//
+//    MIT License
+//
+//    Copyright (c) Microsoft Corporation. All rights reserved.
+//
+//--------------------------------------------------------------
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace JsDbg.Core {
+    internal class FileCache {
+        internal FileCache() {
+            this.cachedFiles = new Dictionary<string, string>();
+            this.lastFlushDate = DateTime.Now;
+        }
+
+        internal static bool PathIsNetworkPath(string path) {
+            try {
+                return DllImports.PathIsNetworkPath(path);
+            } catch (DllNotFoundException) {
+                return false;
+            }
+        }
+
+        internal Stream ReadFile(string path) {
+            // Flush the cache every hour for the scenario where JsDbg is left open overnight etc.
+            if ((DateTime.Now - this.lastFlushDate).TotalSeconds > 3600) {
+                this.lastFlushDate = DateTime.Now;
+                this.cachedFiles = new Dictionary<string, string>();
+            }
+
+            if (FileCache.PathIsNetworkPath(path)) {
+                if (!cachedFiles.ContainsKey(path)) {
+                    cachedFiles[path] = File.ReadAllText(path);
+                }
+
+                MemoryStream stream = new MemoryStream();
+                StreamWriter writer = new StreamWriter(stream);
+                writer.Write(cachedFiles[path]);
+                writer.Flush();
+                stream.Position = 0;
+                return stream;
+            } else {
+                return File.OpenRead(path);
+            }
+        }
+
+        private DateTime lastFlushDate;
+        private Dictionary<string, string> cachedFiles;
+    }
+}