1 files changed, 146 insertions, 0 deletions
diff --git a/MediaBrowser.Api/WebSocket/LogFileWebSocketListener.cs b/MediaBrowser.Api/WebSocket/LogFileWebSocketListener.cs
new file mode 100644
index 000000000..f725b0222
--- /dev/null
+++ b/MediaBrowser.Api/WebSocket/LogFileWebSocketListener.cs
@@ -0,0 +1,146 @@
+using MediaBrowser.Common.IO;
+using MediaBrowser.Common.Kernel;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using MediaBrowser.Model.Logging;
+
+namespace MediaBrowser.Api.WebSocket
+{
+    /// <summary>
+    /// Class ScheduledTasksWebSocketListener
+    /// </summary>
+    [Export(typeof(IWebSocketListener))]
+    public class LogFileWebSocketListener : BasePeriodicWebSocketListener<IKernel, IEnumerable<string>, LogFileWebSocketState>
+    {
+        /// <summary>
+        /// Gets the name.
+        /// </summary>
+        /// <value>The name.</value>
+        protected override string Name
+        {
+            get { return "LogFile"; }
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="LogFileWebSocketListener" /> class.
+        /// </summary>
+        /// <param name="logger">The logger.</param>
+        [ImportingConstructor]
+        public LogFileWebSocketListener([Import("logger")] ILogger logger)
+            : base(logger)
+        {
+
+        }
+
+        /// <summary>
+        /// Initializes the specified kernel.
+        /// </summary>
+        /// <param name="kernel">The kernel.</param>
+        public override void Initialize(IKernel kernel)
+        {
+            base.Initialize(kernel);
+
+            kernel.LoggerLoaded += kernel_LoggerLoaded;
+        }
+
+        /// <summary>
+        /// Gets the data to send.
+        /// </summary>
+        /// <param name="state">The state.</param>
+        /// <returns>IEnumerable{System.String}.</returns>
+        protected override async Task<IEnumerable<string>> GetDataToSend(LogFileWebSocketState state)
+        {
+            if (!string.Equals(Kernel.LogFilePath, state.LastLogFilePath))
+            {
+                state.LastLogFilePath = Kernel.LogFilePath;
+                state.StartLine = 0;
+            }
+
+            var lines = await GetLogLines(state.LastLogFilePath, state.StartLine).ConfigureAwait(false);
+
+            state.StartLine += lines.Count;
+
+            return lines;
+        }
+
+        /// <summary>
+        /// Releases unmanaged and - optionally - managed resources.
+        /// </summary>
+        /// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
+        protected override void Dispose(bool dispose)
+        {
+            if (dispose)
+            {
+                Kernel.LoggerLoaded -= kernel_LoggerLoaded;
+            }
+            base.Dispose(dispose);
+        }
+
+        /// <summary>
+        /// Handles the LoggerLoaded event of the kernel control.
+        /// </summary>
+        /// <param name="sender">The source of the event.</param>
+        /// <param name="e">The <see cref="EventArgs" /> instance containing the event data.</param>
+        void kernel_LoggerLoaded(object sender, EventArgs e)
+        {
+            // Reset the startline for each connection whenever the logger reloads
+            lock (ActiveConnections)
+            {
+                foreach (var connection in ActiveConnections)
+                {
+                    connection.Item4.StartLine = 0;
+                }
+            }
+        }
+
+        /// <summary>
+        /// Gets the log lines.
+        /// </summary>
+        /// <param name="logFilePath">The log file path.</param>
+        /// <param name="startLine">The start line.</param>
+        /// <returns>Task{IEnumerable{System.String}}.</returns>
+        internal static async Task<List<string>> GetLogLines(string logFilePath, int startLine)
+        {
+            var lines = new List<string>();
+
+            using (var fs = new FileStream(logFilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, StreamDefaults.DefaultFileStreamBufferSize, true))
+            {
+                using (var reader = new StreamReader(fs))
+                {
+                    while (!reader.EndOfStream)
+                    {
+                        lines.Add(await reader.ReadLineAsync().ConfigureAwait(false));
+                    }
+                }
+            }
+
+            if (startLine > 0)
+            {
+                lines = lines.Skip(startLine).ToList();
+            }
+
+            return lines;
+        }
+    }
+
+    /// <summary>
+    /// Class LogFileWebSocketState
+    /// </summary>
+    public class LogFileWebSocketState
+    {
+        /// <summary>
+        /// Gets or sets the last log file path.
+        /// </summary>
+        /// <value>The last log file path.</value>
+        public string LastLogFilePath { get; set; }
+        /// <summary>
+        /// Gets or sets the start line.
+        /// </summary>
+        /// <value>The start line.</value>
+        public int StartLine { get; set; }
+    }
+}