632 lines
26 KiB
C#
632 lines
26 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.IO.Ports;
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using System.Net;
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using System.Text;
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using System.Threading;
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namespace EmbeddedAppPcDebug
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{
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/// <summary>
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/// 在单一进程内独占串口，同时提供只允许本机访问的日志与命令接口。
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/// </summary>
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public sealed class SerialWebConsoleHost : IDisposable
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{
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private const int WebClientTimeoutSeconds = 3;
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private const int LastClientGraceMilliseconds = 2000;
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private readonly SerialPort _serialPort;
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private readonly Encoding _encoding;
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private readonly Decoder _decoder;
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private readonly string _logPath;
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private readonly string _rawPath;
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private readonly string _htmlTemplate;
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private readonly string _listenPrefix;
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private readonly string _sessionToken;
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private readonly int _readBufferSize;
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private readonly object _writeLock = new object();
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private readonly object _logLock = new object();
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private readonly object _stateLock = new object();
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private readonly Dictionary<string, DateTime> _webClients = new Dictionary<string, DateTime>(StringComparer.Ordinal);
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private HttpListener _listener;
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private FileStream _rawStream;
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private StreamWriter _textWriter;
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private Thread _receiveThread;
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private Thread _httpThread;
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private Thread _clientMonitorThread;
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private volatile bool _stopping;
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private volatile bool _started;
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private bool _hadWebClient;
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private DateTime _noClientSinceUtc = DateTime.MinValue;
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private string _lastError = string.Empty;
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private string _pendingLine = string.Empty;
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private long _receivedBytes;
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private DateTime _lastReceiveUtc = DateTime.MinValue;
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public SerialWebConsoleHost(
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string portName,
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int baudRate,
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int dataBits,
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string parity,
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string stopBits,
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string handshake,
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string encodingName,
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int readTimeoutMilliseconds,
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int readBufferSize,
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bool dtrEnable,
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bool rtsEnable,
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string logPath,
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string rawPath,
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int webPort,
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string htmlPath)
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{
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if (string.IsNullOrWhiteSpace(portName)) throw new ArgumentException("串口名称不能为空。", "portName");
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if (string.IsNullOrWhiteSpace(logPath)) throw new ArgumentException("文本日志路径不能为空。", "logPath");
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if (string.IsNullOrWhiteSpace(rawPath)) throw new ArgumentException("原始日志路径不能为空。", "rawPath");
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if (string.IsNullOrWhiteSpace(htmlPath) || !File.Exists(htmlPath)) throw new FileNotFoundException("找不到串口控制台页面。", htmlPath);
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_encoding = Encoding.GetEncoding(encodingName);
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_decoder = _encoding.GetDecoder();
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_logPath = Path.GetFullPath(logPath);
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_rawPath = Path.GetFullPath(rawPath);
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_htmlTemplate = File.ReadAllText(htmlPath, new UTF8Encoding(false));
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_listenPrefix = "http://127.0.0.1:" + webPort.ToString(CultureInfo.InvariantCulture) + "/";
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_sessionToken = Guid.NewGuid().ToString("N");
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_readBufferSize = readBufferSize;
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_serialPort = new SerialPort();
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_serialPort.PortName = portName;
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_serialPort.BaudRate = baudRate;
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_serialPort.DataBits = dataBits;
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_serialPort.Parity = (Parity)Enum.Parse(typeof(Parity), parity, true);
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_serialPort.StopBits = (StopBits)Enum.Parse(typeof(StopBits), stopBits, true);
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_serialPort.Handshake = (Handshake)Enum.Parse(typeof(Handshake), handshake, true);
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_serialPort.DtrEnable = dtrEnable;
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_serialPort.RtsEnable = rtsEnable;
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_serialPort.ReadTimeout = readTimeoutMilliseconds;
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_serialPort.ReadBufferSize = Math.Max(4096, readBufferSize);
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}
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public bool IsStopping { get { return _stopping; } }
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public string Url { get { return _listenPrefix; } }
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public void Start()
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{
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if (_started) throw new InvalidOperationException("串口网页服务已经启动。");
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string logDirectory = Path.GetDirectoryName(_logPath);
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string rawDirectory = Path.GetDirectoryName(_rawPath);
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if (!string.IsNullOrEmpty(logDirectory)) Directory.CreateDirectory(logDirectory);
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if (!string.IsNullOrEmpty(rawDirectory)) Directory.CreateDirectory(rawDirectory);
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try
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{
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FileStream textStream = new FileStream(_logPath, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
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_textWriter = new StreamWriter(textStream, new UTF8Encoding(false));
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_textWriter.AutoFlush = true;
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_rawStream = new FileStream(_rawPath, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
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_serialPort.Open();
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WriteSystemLog(string.Format(
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CultureInfo.InvariantCulture,
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"已打开 {0}，{1} {2}{3}{4}，流控 {5}；网页控制台：{6}；原始数据：{7}",
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_serialPort.PortName,
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_serialPort.BaudRate,
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_serialPort.DataBits,
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_serialPort.Parity.ToString().Substring(0, 1),
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_serialPort.StopBits == StopBits.One ? "1" : (_serialPort.StopBits == StopBits.Two ? "2" : "1.5"),
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_serialPort.Handshake,
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_listenPrefix,
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_rawPath));
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_listener = new HttpListener();
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_listener.Prefixes.Add(_listenPrefix);
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_listener.Start();
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_stopping = false;
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_started = true;
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_receiveThread = StartBackgroundThread(ReceiveLoop, "SerialWebConsole-RX");
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_httpThread = StartBackgroundThread(HttpLoop, "SerialWebConsole-HTTP");
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_clientMonitorThread = StartBackgroundThread(WebClientMonitorLoop, "SerialWebConsole-WebClient");
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}
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catch
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{
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Stop();
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throw;
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}
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}
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private static Thread StartBackgroundThread(ThreadStart action, string name)
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{
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Thread thread = new Thread(action);
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thread.IsBackground = true;
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thread.Name = name;
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thread.Start();
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return thread;
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}
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private void ReceiveLoop()
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{
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byte[] byteBuffer = new byte[_readBufferSize];
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char[] charBuffer = new char[_encoding.GetMaxCharCount(_readBufferSize)];
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while (!_stopping)
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{
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try
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{
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int count = _serialPort.Read(byteBuffer, 0, byteBuffer.Length);
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if (count <= 0) continue;
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lock (_logLock)
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{
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_rawStream.Write(byteBuffer, 0, count);
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_rawStream.Flush();
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}
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int charCount = _decoder.GetChars(byteBuffer, 0, count, charBuffer, 0, false);
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if (charCount > 0)
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{
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string text = new string(charBuffer, 0, charCount);
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Console.Write(text);
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WriteReceivedText(text);
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}
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Interlocked.Add(ref _receivedBytes, count);
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lock (_stateLock)
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{
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_lastReceiveUtc = DateTime.UtcNow;
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}
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}
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catch (TimeoutException)
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{
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// 读取超时用于让线程定期检查退出状态，不属于串口错误。
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}
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catch (Exception ex)
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{
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if (!_stopping)
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{
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SetFatalError("串口读取失败：" + ex.Message);
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}
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}
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}
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}
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private void WriteReceivedText(string text)
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{
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lock (_logLock)
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{
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_pendingLine += text;
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while (true)
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{
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int newlineIndex = _pendingLine.IndexOf('\n');
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if (newlineIndex < 0) break;
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string line = _pendingLine.Substring(0, newlineIndex).TrimEnd('\r');
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_pendingLine = _pendingLine.Substring(newlineIndex + 1);
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_textWriter.WriteLine("[" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff", CultureInfo.InvariantCulture) + "] " + line);
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}
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}
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}
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private void WriteCommand(string text, string ending)
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{
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string terminator;
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switch ((ending ?? string.Empty).ToUpperInvariant())
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{
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case "NONE": terminator = string.Empty; break;
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case "CR": terminator = "\r"; break;
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case "LF": terminator = "\n"; break;
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case "CRLF": terminator = "\r\n"; break;
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default: throw new ArgumentException("换行方式必须是 None、CR、LF 或 CRLF。", "ending");
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}
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string payload = (text ?? string.Empty) + terminator;
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WriteBytes(_encoding.GetBytes(payload));
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WriteTransmitLog(payload, "命令");
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}
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private void WriteTransmitLog(string text, string source)
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{
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// 将不可见的行尾转成明确标记，空命令回车会显示为 <CR>。
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StringBuilder visible = new StringBuilder();
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foreach (char c in text ?? string.Empty)
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{
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switch (c)
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{
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case '\r': visible.Append("<CR>"); break;
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case '\n': visible.Append("<LF>"); break;
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case '\t': visible.Append("<TAB>"); break;
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default:
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if (c < 32) visible.Append("<0x" + ((int)c).ToString("X2", CultureInfo.InvariantCulture) + ">");
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else visible.Append(c);
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break;
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}
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}
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if (visible.Length == 0) visible.Append("<EMPTY>");
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string line = "[" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff", CultureInfo.InvariantCulture) + "] [TX:" + source + "] " + visible;
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Console.WriteLine(line);
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lock (_logLock)
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{
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if (_textWriter != null) _textWriter.WriteLine(line);
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}
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}
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private void WriteBytes(byte[] bytes)
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{
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if (bytes == null || bytes.Length == 0) return;
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lock (_writeLock)
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{
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if (_stopping || !_serialPort.IsOpen) throw new IOException("串口当前未打开。");
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_serialPort.BaseStream.Write(bytes, 0, bytes.Length);
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_serialPort.BaseStream.Flush();
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}
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}
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private void TouchWebClient(string clientId)
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{
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if (string.IsNullOrWhiteSpace(clientId) || clientId.Length > 128) return;
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lock (_stateLock)
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{
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_webClients[clientId] = DateTime.UtcNow;
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_hadWebClient = true;
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_noClientSinceUtc = DateTime.MinValue;
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}
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}
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private void RemoveWebClient(string clientId)
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{
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if (string.IsNullOrWhiteSpace(clientId)) return;
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lock (_stateLock)
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{
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_webClients.Remove(clientId);
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if (_hadWebClient && _webClients.Count == 0 && _noClientSinceUtc == DateTime.MinValue)
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_noClientSinceUtc = DateTime.UtcNow;
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}
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}
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private void WebClientMonitorLoop()
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{
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while (!_stopping)
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{
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bool shouldStop = false;
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lock (_stateLock)
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{
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DateTime now = DateTime.UtcNow;
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List<string> expiredClients = new List<string>();
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foreach (KeyValuePair<string, DateTime> item in _webClients)
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{
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if ((now - item.Value).TotalSeconds >= WebClientTimeoutSeconds)
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expiredClients.Add(item.Key);
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}
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foreach (string clientId in expiredClients) _webClients.Remove(clientId);
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if (_webClients.Count > 0)
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{
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_noClientSinceUtc = DateTime.MinValue;
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}
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else if (_hadWebClient)
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{
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if (_noClientSinceUtc == DateTime.MinValue) _noClientSinceUtc = now;
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shouldStop = (now - _noClientSinceUtc).TotalMilliseconds >= LastClientGraceMilliseconds;
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}
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}
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if (shouldStop)
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{
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WriteSystemLog("最后一个串口网页已关闭，正在停止日志采集并释放串口。");
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_stopping = true;
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try { if (_listener != null) _listener.Stop(); } catch { }
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break;
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}
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Thread.Sleep(250);
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}
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}
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private void HttpLoop()
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{
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while (!_stopping)
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{
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try
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{
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HttpListenerContext context = _listener.GetContext();
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ThreadPool.QueueUserWorkItem(delegate { HandleHttpRequest(context); });
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}
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catch (HttpListenerException)
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{
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if (!_stopping) SetFatalError("本地网页服务异常停止。");
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}
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catch (ObjectDisposedException)
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{
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// 服务关闭时 GetContext 会退出。
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}
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catch (Exception ex)
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{
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if (!_stopping) SetFatalError("本地网页服务失败：" + ex.Message);
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}
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}
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}
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private void HandleHttpRequest(HttpListenerContext context)
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{
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try
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{
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if (context.Request.RemoteEndPoint == null || !IPAddress.IsLoopback(context.Request.RemoteEndPoint.Address))
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{
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SendTextResponse(context, 403, "text/plain; charset=utf-8", "只允许本机访问。");
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return;
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}
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string path = context.Request.Url == null ? "/" : context.Request.Url.AbsolutePath;
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string method = context.Request.HttpMethod.ToUpperInvariant();
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if (method == "GET" && (path == "/" || path == "/index.html"))
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{
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string html = _htmlTemplate
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.Replace("__SESSION_TOKEN__", _sessionToken)
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.Replace("__SERIAL_PORT__", WebUtility.HtmlEncode(_serialPort.PortName));
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SendTextResponse(context, 200, "text/html; charset=utf-8", html);
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return;
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}
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if (method == "GET" && path == "/api/status")
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{
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TouchWebClient(context.Request.QueryString["client"]);
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SendTextResponse(context, 200, "application/json; charset=utf-8", BuildStatusJson());
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return;
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}
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if (method == "GET" && path == "/api/log")
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{
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TouchWebClient(context.Request.QueryString["client"]);
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SendLogTail(context, 2 * 1024 * 1024);
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return;
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}
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if (method == "GET" && path == "/favicon.ico")
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{
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context.Response.StatusCode = 204;
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context.Response.Close();
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return;
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}
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if (method == "POST")
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{
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if (path == "/api/send")
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{
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ValidateCommandRequest(context);
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string ending = context.Request.QueryString["ending"] ?? "CR";
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string command = ReadRequestBody(context.Request, 16384);
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WriteCommand(command, ending);
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SendTextResponse(context, 200, "application/json; charset=utf-8", "{\"status\":\"written\"}");
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return;
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}
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if (path == "/api/client/disconnect")
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{
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ValidateDisconnectRequest(context);
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RemoveWebClient(context.Request.QueryString["client"]);
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SendTextResponse(context, 200, "application/json; charset=utf-8", "{\"status\":\"disconnected\"}");
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return;
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}
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}
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SendTextResponse(context, 404, "text/plain; charset=utf-8", "未找到接口。");
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}
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catch (ArgumentException ex)
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{
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SendTextResponse(context, 400, "application/json; charset=utf-8", "{\"error\":\"" + JsonEscape(ex.Message) + "\"}");
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}
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catch (UnauthorizedAccessException ex)
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{
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SendTextResponse(context, 403, "application/json; charset=utf-8", "{\"error\":\"" + JsonEscape(ex.Message) + "\"}");
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}
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catch (Exception ex)
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{
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lock (_stateLock) _lastError = ex.Message;
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SendTextResponse(context, 503, "application/json; charset=utf-8", "{\"error\":\"" + JsonEscape(ex.Message) + "\"}");
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}
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}
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private void ValidateCommandRequest(HttpListenerContext context)
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{
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string token = context.Request.Headers["X-Serial-Token"];
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if (!string.Equals(token, _sessionToken, StringComparison.Ordinal))
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throw new UnauthorizedAccessException("本地会话令牌无效。");
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string origin = context.Request.Headers["Origin"];
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if (!string.IsNullOrWhiteSpace(origin) &&
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!string.Equals(origin.TrimEnd('/') + "/", _listenPrefix, StringComparison.OrdinalIgnoreCase))
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throw new UnauthorizedAccessException("请求来源不是当前串口控制台。");
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}
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private void ValidateDisconnectRequest(HttpListenerContext context)
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{
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// sendBeacon 无法自定义请求头，因此仅离页通知接口允许在查询参数中携带会话令牌。
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string token = context.Request.Headers["X-Serial-Token"];
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if (string.IsNullOrWhiteSpace(token)) token = context.Request.QueryString["token"];
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if (!string.Equals(token, _sessionToken, StringComparison.Ordinal))
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throw new UnauthorizedAccessException("本地会话令牌无效。");
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string origin = context.Request.Headers["Origin"];
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if (!string.IsNullOrWhiteSpace(origin) &&
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!string.Equals(origin.TrimEnd('/') + "/", _listenPrefix, StringComparison.OrdinalIgnoreCase))
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throw new UnauthorizedAccessException("请求来源不是当前串口控制台。");
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}
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private static string ReadRequestBody(HttpListenerRequest request, int maxCharacters)
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{
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Encoding bodyEncoding = request.ContentEncoding ?? Encoding.UTF8;
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using (StreamReader reader = new StreamReader(request.InputStream, bodyEncoding, true, 1024, false))
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{
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char[] buffer = new char[maxCharacters + 1];
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int total = 0;
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while (total < buffer.Length)
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{
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int count = reader.Read(buffer, total, buffer.Length - total);
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if (count <= 0) break;
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total += count;
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}
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if (total > maxCharacters) throw new ArgumentException("单次命令不能超过 16384 个字符。");
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return new string(buffer, 0, total);
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}
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}
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private void SendLogTail(HttpListenerContext context, int maxBytes)
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{
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byte[] data;
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using (FileStream stream = new FileStream(_logPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
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{
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long start = Math.Max(0, stream.Length - maxBytes);
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stream.Position = start;
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data = new byte[stream.Length - start];
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int offset = 0;
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while (offset < data.Length)
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{
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int count = stream.Read(data, offset, data.Length - offset);
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if (count <= 0) break;
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offset += count;
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}
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if (offset != data.Length) Array.Resize(ref data, offset);
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}
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context.Response.StatusCode = 200;
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context.Response.ContentType = "text/plain; charset=utf-8";
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context.Response.Headers["Cache-Control"] = "no-store";
|
||
context.Response.ContentLength64 = data.Length;
|
||
context.Response.OutputStream.Write(data, 0, data.Length);
|
||
context.Response.Close();
|
||
}
|
||
|
||
private string BuildStatusJson()
|
||
{
|
||
string lastError;
|
||
DateTime lastReceive;
|
||
int activeWebClients;
|
||
lock (_stateLock)
|
||
{
|
||
lastError = _lastError;
|
||
lastReceive = _lastReceiveUtc;
|
||
activeWebClients = _webClients.Count;
|
||
}
|
||
|
||
return "{" +
|
||
"\"port\":\"" + JsonEscape(_serialPort.PortName) + "\"," +
|
||
"\"isOpen\":" + (_serialPort.IsOpen && !_stopping ? "true" : "false") + "," +
|
||
"\"receivedBytes\":" + Interlocked.Read(ref _receivedBytes).ToString(CultureInfo.InvariantCulture) + "," +
|
||
"\"lastReceiveUtc\":\"" + (lastReceive == DateTime.MinValue ? string.Empty : lastReceive.ToString("o", CultureInfo.InvariantCulture)) + "\"," +
|
||
"\"activeWebClients\":" + activeWebClients.ToString(CultureInfo.InvariantCulture) + "," +
|
||
"\"lastError\":\"" + JsonEscape(lastError) + "\"" +
|
||
"}";
|
||
}
|
||
|
||
private static string JsonEscape(string value)
|
||
{
|
||
if (string.IsNullOrEmpty(value)) return string.Empty;
|
||
StringBuilder builder = new StringBuilder(value.Length + 16);
|
||
foreach (char c in value)
|
||
{
|
||
switch (c)
|
||
{
|
||
case '\\': builder.Append("\\\\"); break;
|
||
case '"': builder.Append("\\\""); break;
|
||
case '\r': builder.Append("\\r"); break;
|
||
case '\n': builder.Append("\\n"); break;
|
||
case '\t': builder.Append("\\t"); break;
|
||
default:
|
||
if (c < 32) builder.Append("\\u" + ((int)c).ToString("x4", CultureInfo.InvariantCulture));
|
||
else builder.Append(c);
|
||
break;
|
||
}
|
||
}
|
||
return builder.ToString();
|
||
}
|
||
|
||
private static void SendTextResponse(HttpListenerContext context, int statusCode, string contentType, string text)
|
||
{
|
||
try
|
||
{
|
||
byte[] data = new UTF8Encoding(false).GetBytes(text ?? string.Empty);
|
||
context.Response.StatusCode = statusCode;
|
||
context.Response.ContentType = contentType;
|
||
context.Response.Headers["Cache-Control"] = "no-store";
|
||
context.Response.ContentLength64 = data.Length;
|
||
context.Response.OutputStream.Write(data, 0, data.Length);
|
||
context.Response.Close();
|
||
}
|
||
catch
|
||
{
|
||
try { context.Response.Abort(); } catch { }
|
||
}
|
||
}
|
||
|
||
private void SetFatalError(string message)
|
||
{
|
||
lock (_stateLock) _lastError = message;
|
||
WriteSystemLog(message);
|
||
_stopping = true;
|
||
try { if (_listener != null) _listener.Stop(); } catch { }
|
||
}
|
||
|
||
private void WriteSystemLog(string message)
|
||
{
|
||
string line = "[" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff", CultureInfo.InvariantCulture) + "] " + message;
|
||
Console.WriteLine(line);
|
||
lock (_logLock)
|
||
{
|
||
if (_textWriter != null) _textWriter.WriteLine(line);
|
||
}
|
||
}
|
||
|
||
public void Stop()
|
||
{
|
||
_stopping = true;
|
||
try { if (_listener != null) _listener.Stop(); } catch { }
|
||
try { if (_serialPort.IsOpen) _serialPort.Close(); } catch { }
|
||
|
||
JoinThread(_httpThread);
|
||
JoinThread(_clientMonitorThread);
|
||
JoinThread(_receiveThread);
|
||
|
||
lock (_logLock)
|
||
{
|
||
if (_textWriter != null && !string.IsNullOrEmpty(_pendingLine))
|
||
{
|
||
_textWriter.WriteLine("[" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff", CultureInfo.InvariantCulture) + "] " + _pendingLine.TrimEnd('\r'));
|
||
_pendingLine = string.Empty;
|
||
}
|
||
if (_textWriter != null)
|
||
{
|
||
_textWriter.WriteLine("[" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff", CultureInfo.InvariantCulture) + "] 串口网页服务结束");
|
||
_textWriter.Dispose();
|
||
_textWriter = null;
|
||
}
|
||
if (_rawStream != null)
|
||
{
|
||
_rawStream.Dispose();
|
||
_rawStream = null;
|
||
}
|
||
}
|
||
|
||
if (_listener != null)
|
||
{
|
||
try { _listener.Close(); } catch { }
|
||
_listener = null;
|
||
}
|
||
_serialPort.Dispose();
|
||
_started = false;
|
||
}
|
||
|
||
private static void JoinThread(Thread thread)
|
||
{
|
||
if (thread == null || thread == Thread.CurrentThread) return;
|
||
try { thread.Join(1500); } catch { }
|
||
}
|
||
|
||
public void Dispose()
|
||
{
|
||
Stop();
|
||
}
|
||
}
|
||
}
|