OpenSimulator Internals/Code Map

OpenSimulator Internals/Code Map/ROBUST

Overview

ROBUST is the grid services process. It reads configuration, starts HTTP listeners, loads service connector plugins, then sits waiting for incoming HTTP requests from simulators.

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Entry Point

OpenSim/Server/ServerMain.cs -- class OpenSimServer, Main()

Sequence:

1. Sets culture and .NET HTTP client defaults:
   • ServicePointManager.DefaultConnectionLimit = 64
   • ServicePointManager.MaxServicePointIdleTime = 30000
   • Expect100Continue = false
   • UseNagleAlgorithm = false
   • ServerCertificateValidationCallback = ValidateServerCertificate
2. Creates HttpServerBase("R.O.B.U.S.T.", args) -- config is loaded here (see Config Loading below)
3. Reads [Startup] section -- throws if missing
4. Reads DnsTimeout (default 30000ms), NoVerifyCertChain, NoVerifyCertHostname from [Startup]
5. Calls WebUtil.SetupHTTPClients() with cert settings and max 32 connections
6. Reads connector list -- merges ServiceConnectors from [Startup] with all keys from [ServiceList]
7. Copies System.Drawing.Common.dll for current platform (Windows vs Linux)
8. Loops through connectors -- parses configName@port/dll:class format, loads each (see Service Connector Loading below)
9. Special case: LLLoginServiceInConnector gets an IndexPHPHandler added to its HTTP server before loading
10. Prints robuststartuplogo.txt to console if present
11. Creates PluginLoader
12. Calls m_Server.Run() -- enters main loop
13. On exit: m_Server.Shutdown(), Util.StopThreadPool(), Environment.Exit()

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Config Loading

OpenSim/Server/Base/HttpServerBase.cs
OpenSim/Server/Base/ServicesServerBase.cs

HttpServerBase constructor handles config loading. Layers are applied in order, each overriding the previous:

1. Command line args parsed (-i ini file, -c console, -l logfile, -p prompt, -g logconfig)
2. Ini file loaded -- defaults to Robust.ini, derived from executable name. Can be a local file or remote HTTP/HTTPS URL.
3. Include-* keys scanned -- additional ini files merged in. Supports wildcards and URLs. Loop repeats until no new includes found.
4. Environment variables merged in
5. Command line args merged on top -- command line always wins
6. Variable substitution run (ReplaceKeyValues) -- expands ${Section|Key} references
7. ReadConfig() called -- reads [Network] section for port and SSL settings

[Network] minimum requirements:

• port -- required, no default, ROBUST will not start without it
• https_main, https_listener, https_external -- optional SSL flags
• cert_path, cert_pass -- required if SSL enabled
• ConsolePort -- optional remote console port

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HTTP Servers

OpenSim/Server/Base/HttpServerBase.cs

• Main HTTP server created on port from [Network]
• Optional second SSL listener if https_listener = true
• All servers started before connectors are loaded
• Additional ports are created on demand via MainServer.GetHttpServer(port) during connector loading
• Handlers register into a running server during connector construction

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Service Connector Loading

OpenSim/Server/Base/ServerUtils.cs -- LoadPlugin()

Connector string format:

configName@port/OpenSim.Server.Handlers.dll:ClassName

Parsing:

• Split on / -- left side is optional configName@port, right side is dll:class
• Split left side on @ -- if two parts, first is configName, second is port
• If port specified: get or create HTTP server for that port via MainServer.GetHttpServer()
• If no port: use MainServer.Instance (main port)

Loading:

• LoadPlugin() tries constructor with (IConfigSource, IHttpServer, configName) first
• Falls back to (IConfigSource, IHttpServer) if that fails
• Loaded connectors added to m_ServiceConnectors list
• Failed loads logged as errors but do not stop startup

See OpenSimulator Internals/Connector Architecture for the full connector pattern.

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Main Loop

OpenSim/Server/Base/ServicesServerBase.cs -- Run()

• Watchdog and MemoryWatchdog threads enabled
• Sits in a console prompt loop
• Shutdown signal (quit/shutdown command or SIGTERM) triggers:
  • m_Server.Shutdown()
  • Util.StopThreadPool()
  • Environment.Exit()

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Service Implementations

Each service connector loaded from [ServiceList] handles one service domain. See OpenSimulator Internals/ROBUST Services for the full list.

Service	Implementation	Handler
AssetService	OpenSim/Services/AssetService/AssetService.cs	OpenSim/Server/Handlers/Asset/
GridService	OpenSim/Services/GridService/GridService.cs	OpenSim/Server/Handlers/Grid/
UserAccountService	OpenSim/Services/UserAccountService/UserAccountService.cs	OpenSim/Server/Handlers/UserAccounts/
PresenceService	OpenSim/Services/PresenceService/PresenceService.cs	OpenSim/Server/Handlers/Presence/
InventoryService	OpenSim/Services/InventoryService/XInventoryService.cs	OpenSim/Server/Handlers/Inventory/
AuthenticationService	OpenSim/Services/AuthenticationService/PasswordAuthenticationService.cs	OpenSim/Server/Handlers/Authentication/
LoginService	OpenSim/Services/LLLoginService/LLLoginService.cs	OpenSim/Server/Handlers/Login/
GatekeeperService	OpenSim/Services/HypergridService/GatekeeperService.cs	OpenSim/Server/Handlers/Hypergrid/
UserAgentService	OpenSim/Services/HypergridService/UserAgentService.cs	OpenSim/Server/Handlers/Hypergrid/

See OpenSimulator Internals/Code Map/ROBUST/GridService RegisterRegion for a detailed trace of GridService.RegisterRegion() and DeregisterRegion().

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See Also

• OpenSimulator Internals/Code Map
• OpenSimulator Internals/Reading the Code
• OpenSimulator Internals/ROBUST Services
• OpenSimulator Internals/Connector Architecture