tools/mono-service/mono-service.cs

   1 /*
   2  * monod.cs: Mono daemon for running services based on System.ServiceProcess
   3  *
   4  * Author:
   5  *   Joerg Rosenkranz (joergr@voelcker.com)
   6  *   Miguel de Icaza (miguel@novell.com)
   7  *
   8  * (C) 2005 Voelcker Informatik AG
   9  * (C) 2005 Novell Inc
  10  */
  11 using System;
  12 using System.IO;
  13 using System.Reflection;
  14 using Mono.Unix;
  15 using Mono.Unix.Native;
  16 using System.ServiceProcess;
  17 using System.Threading;
  18 using System.Runtime.InteropServices;
  19
  20 class MonoServiceRunner : MarshalByRefObject
  21 {
  22         string assembly, name, logname;
  23
  24         static void info (string prefix, string format, params object [] args)
  25         {
  26                 Syscall.syslog (SyslogLevel.LOG_INFO, String.Format ("{0}: {1}", prefix, String.Format (format, args)));
  27         }
  28
  29         static void error (string prefix, string format, params object [] args)
  30         {
  31                 Syscall.syslog (SyslogLevel.LOG_ERR, String.Format ("{0}: {1}", prefix, String.Format (format, args)));
  32         }
  33
  34         static void Usage ()
  35         {
  36                 Console.Error.WriteLine (
  37                                          "Usage is:\n" +
  38                                          "mono-service [-d:DIRECTORY] [-l:LOCKFILE] [-n:NAME] [-m:LOGNAME] service.exe\n");
  39                 Environment.Exit (1);
  40         }
  41
  42         static void call (object o, string method, object [] arg)
  43         {
  44                 MethodInfo m = o.GetType ().GetMethod (method, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
  45                 if (arg != null)
  46                         m.Invoke (o, new object [1] { arg });
  47                 else
  48                         m.Invoke (o, null);
  49         }
  50
  51         static int Main (string [] args)
  52         {
  53                 string assembly = null;
  54                 string directory = null;
  55                 string lockfile = null;
  56                 string name = null;
  57                 string logname = null;
  58
  59                 foreach (string s in args){
  60                         if (s.Length > 3 && s [0] == '-' && s [2] == ':'){
  61                                 string arg = s.Substring (3);
  62
  63                                 switch (Char.ToLower (s [1])){
  64                                 case 'd': directory = arg; break;
  65                                 case 'l': lockfile = arg; break;
  66                                 case 'n': name = arg; break;
  67                                 case 'm': logname = arg; break;
  68                                 default: Usage (); break;
  69                                 }
  70                         } else {
  71                                 if (assembly != null)
  72                                         Usage ();
  73
  74                                 assembly = s;
  75                         }
  76                 }
  77
  78                 if (logname == null)
  79                         logname = assembly;
  80
  81                 if (assembly == null){
  82                         error (logname, "Assembly name is missing");
  83                         Usage ();
  84                 }
  85
  86                 if (directory != null){
  87                         if (Syscall.chdir (directory) != 0){
  88                                 error (logname, "Could not change to directory {0}", directory);
  89                                 return 1;
  90                         }
  91                 }
  92
  93                 // Use lockfile to allow only one instance
  94                 if (lockfile == null)
  95                         lockfile = String.Format ("/tmp/{0}.lock", Path.GetFileName (assembly));
  96
  97                 int lfp = Syscall.open (lockfile, OpenFlags.O_RDWR|OpenFlags.O_CREAT|OpenFlags.O_EXCL,
  98                         FilePermissions.S_IRUSR|FilePermissions.S_IWUSR|FilePermissions.S_IRGRP);
  99
 100                 if (lfp<0)  {
 101                         // Provide some useful info
 102                         if (File.Exists (lockfile))
 103                                 error (logname, String.Format ("Lock file already exists: {0}", lockfile));
 104                         else
 105                                 error (logname, String.Format ("Cannot open/create lock file exclusively: {0}", lockfile));
 106                         return 1;
 107                 }
 108
 109                 if (Syscall.lockf(lfp, LockfCommand.F_TLOCK,0)<0)  {
 110                         info (logname, "Daemon is already running.");
 111                         return 0;
 112                 }
 113
 114                 try {
 115                         // Write pid to lock file
 116                         string pid = Syscall.getpid ().ToString () + Environment.NewLine;
 117                         IntPtr buf = Marshal.StringToCoTaskMemAnsi (pid);
 118                         Syscall.write (lfp, buf, (ulong)pid.Length);
 119                         Marshal.FreeCoTaskMem (buf);
 120
 121                         // Create new AppDomain to run service
 122                         AppDomainSetup setup = new AppDomainSetup ();
 123                         setup.ApplicationBase = Environment.CurrentDirectory;
 124                         setup.ConfigurationFile = Path.Combine (Environment.CurrentDirectory, assembly + ".config");
 125                         setup.ApplicationName = logname;
 126
 127                         AppDomain newDomain = AppDomain.CreateDomain (logname, AppDomain.CurrentDomain.Evidence, setup);
 128                         MonoServiceRunner rnr = newDomain.CreateInstanceAndUnwrap(
 129                                 typeof (MonoServiceRunner).Assembly.FullName,
 130                                 typeof (MonoServiceRunner).FullName,
 131                                 true,
 132                                 BindingFlags.Default,
 133                                 null,
 134                                 new object [] {assembly, name, logname},
 135                                 null, null, null) as MonoServiceRunner;
 136
 137                         if (rnr == null) {
 138                                 error (logname, "Internal Mono Error: Could not create MonoServiceRunner.");
 139                                 return 1;
 140                         }
 141
 142                         return rnr.StartService ();
 143                 } finally {
 144                         // Remove lock file when done
 145                         if (File.Exists(lockfile))
 146                                 File.Delete (lockfile);
 147                 }
 148         }
 149
 150         public MonoServiceRunner (string assembly, string name, string logname)
 151         {
 152                 this.assembly = assembly;
 153                 this.name = name;
 154                 this.logname = logname;
 155         }
 156
 157         public int StartService ()
 158         {
 159                 try     {
 160                         // Load service assembly
 161                         Assembly a = null;
 162
 163                         try {
 164                                 a = Assembly.LoadFrom (assembly);
 165                         } catch (FileNotFoundException) {
 166                                 error (logname, "Could not find assembly {0}", assembly);
 167                                 return 1;
 168                         } catch (BadImageFormatException){
 169                                 error (logname, "File {0} is not a valid assembly", assembly);
 170                                 return 1;
 171                         } catch { }
 172
 173                         if (a == null){
 174                                 error (logname, "Could not load assembly {0}", assembly);
 175                                 return 1;
 176                         }
 177
 178                         if (a.EntryPoint == null){
 179                                 error (logname, "Entry point not defined in service");
 180                                 return 1;
 181                         }
 182
 183                         // Hook up RunService callback
 184                         Type cbType = Type.GetType ("System.ServiceProcess.ServiceBase+RunServiceCallback, System.ServiceProcess");
 185                         if (cbType == null){
 186                                 error (logname, "Internal Mono Error: Could not find RunServiceCallback in ServiceBase");
 187                                 return 1;
 188                         }
 189
 190                         FieldInfo fi = typeof (ServiceBase).GetField ("RunService", BindingFlags.Static | BindingFlags.NonPublic);
 191                         if (fi == null){
 192                                 error (logname, "Internal Mono Error: Could not find RunService in ServiceBase");
 193                                 return 1;
 194                         }
 195                         fi.SetValue (null, Delegate.CreateDelegate(cbType, this, "MainLoop"));
 196
 197                         // And run its Main. Our RunService handler is invoked from
 198                         // ServiceBase.Run.
 199                         return AppDomain.CurrentDomain.ExecuteAssembly (assembly, AppDomain.CurrentDomain.Evidence);
 200
 201                 } catch ( Exception ex ) {
 202                         for (Exception e = ex; e != null; e = e.InnerException) {
 203                                 error (logname, e.Message);
 204                         }
 205
 206                         return 1;
 207                 }
 208         }
 209
 210         // The main service loop
 211         private void MainLoop (ServiceBase [] services)
 212         {
 213                 try {
 214                         ServiceBase service;
 215
 216                         if (services == null || services.Length == 0){
 217                                 error (logname, "No services were registered by this service");
 218                                 return;
 219                         }
 220
 221                         // Start up the service.
 222                         service = null;
 223
 224                         if (name != null){
 225                                 foreach (ServiceBase svc in services){
 226                                         if (svc.ServiceName == name){
 227                                                 service = svc;
 228                                                 break;
 229                                         }
 230                                 }
 231                         } else {
 232                                 service = services [0];
 233                         }
 234
 235                         call (service, "OnStart", new string [0]);
 236                         info (logname, "Service {0} started", service.ServiceName);
 237
 238                         UnixSignal intr = new UnixSignal (Signum.SIGINT);
 239                         UnixSignal term = new UnixSignal (Signum.SIGTERM);
 240                         UnixSignal usr1 = new UnixSignal (Signum.SIGUSR1);
 241                         UnixSignal usr2 = new UnixSignal (Signum.SIGUSR2);
 242
 243                         UnixSignal[] sigs = new UnixSignal[]{
 244                                 intr,
 245                                 term,
 246                                 usr1,
 247                                 usr2
 248                         };
 249
 250                         for (bool running = true; running; ){
 251                                 int idx = UnixSignal.WaitAny (sigs);
 252                                 if (idx < 0 || idx >= sigs.Length)
 253                                         continue;
 254                                 if ((intr.IsSet || term.IsSet) && service.CanStop) {
 255                                         intr.Reset ();
 256                                         term.Reset ();
 257                                         info (logname, "Stopping service {0}", service.ServiceName);
 258                                         call (service, "OnStop", null);
 259                                         running = false;
 260                                 }
 261                                 else if (usr1.IsSet && service.CanPauseAndContinue) {
 262                                         usr1.Reset ();
 263                                         info (logname, "Pausing service {0}", service.ServiceName);
 264                                         call (service, "OnPause", null);
 265                                 }
 266                                 else if (usr2.IsSet && service.CanPauseAndContinue) {
 267                                         usr2.Reset ();
 268                                         info (logname, "Continuing service {0}", service.ServiceName);
 269                                         call (service, "OnContinue", null);
 270                                 }
 271                         }
 272                 } finally {
 273                         // Clean up
 274                         foreach (ServiceBase svc in services){
 275                                 svc.Dispose ();
 276                         }
 277                 }
 278         }
 279 }