Emby.Server.Implementations/Diagnostics/CommonProcess.cs


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140

using System;
using System.Diagnostics;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Model.Diagnostics;

namespace Emby.Server.Implementations.Diagnostics
{
    public class CommonProcess : IProcess
    {
        public event EventHandler Exited;

        private readonly ProcessOptions _options;
        private readonly Process _process;

        public CommonProcess(ProcessOptions options)
        {
            _options = options;

            var startInfo = new ProcessStartInfo
            {
                Arguments = options.Arguments,
                FileName = options.FileName,
                WorkingDirectory = options.WorkingDirectory,
                UseShellExecute = options.UseShellExecute,
                CreateNoWindow = options.CreateNoWindow,
                RedirectStandardError = options.RedirectStandardError,
                RedirectStandardInput = options.RedirectStandardInput,
                RedirectStandardOutput = options.RedirectStandardOutput
            };

            startInfo.ErrorDialog = options.ErrorDialog;

            if (options.IsHidden)
            {
                startInfo.WindowStyle = ProcessWindowStyle.Hidden;
            }

            _process = new Process
            {
                StartInfo = startInfo
            };

            if (options.EnableRaisingEvents)
            {
                _process.EnableRaisingEvents = true;
                _process.Exited += _process_Exited;
            }
        }

        private bool _hasExited;
        private bool HasExited
        {
            get
            {
                if (_hasExited)
                {
                    return true;
                }

                try
                {
                    _hasExited = _process.HasExited;
                }
                catch (InvalidOperationException)
                {
                    _hasExited = true;
                }

                return _hasExited;
            }
        }

        private void _process_Exited(object sender, EventArgs e)
        {
            _hasExited = true;
            if (Exited != null)
            {
                Exited(this, e);
            }
        }

        public ProcessOptions StartInfo => _options;

        public StreamWriter StandardInput => _process.StandardInput;

        public StreamReader StandardError => _process.StandardError;

        public StreamReader StandardOutput => _process.StandardOutput;

        public int ExitCode => _process.ExitCode;

        public void Start()
        {
            _process.Start();
        }

        public void Kill()
        {
            _process.Kill();
        }

        public bool WaitForExit(int timeMs)
        {
            return _process.WaitForExit(timeMs);
        }

        public Task<bool> WaitForExitAsync(int timeMs)
        {
            //if (_process.WaitForExit(100))
            //{
            //    return Task.FromResult(true);
            //}

            //timeMs -= 100;
            timeMs = Math.Max(0, timeMs);

            var tcs = new TaskCompletionSource<bool>();

            var cancellationToken = new CancellationTokenSource(timeMs).Token;

            if (HasExited)
            {
                return Task.FromResult(true);
            }

            _process.Exited += (sender, args) => tcs.TrySetResult(true);

            cancellationToken.Register(() => tcs.TrySetResult(HasExited));

            return tcs.Task;
        }

        public void Dispose()
        {
            _process.Dispose();
        }
    }
}