Capabilities

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Note 1: ViewerAsset cap should be disabled util Firestorm 6.0.x is replaced<br>
 
Note 1: ViewerAsset cap should be disabled util Firestorm 6.0.x is replaced<br>
Note 2: ExtEnvironment cap may not endup on releases
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Note 2: ExtEnvironment cap may not endup on releases<br>
 
NOTE 3: Caps format may change
 
NOTE 3: Caps format may change
  

Latest revision as of 16:13, 12 April 2020

Contents

[edit] Introduction

Capabilities are the mechanism by which a region makes certain information and services available to viewers via HTTP in addition to the messages being exchanged over UDP.

The Second Life wiki describes capabilities.

The Second Life wiki also has an incomplete summary of current capabilities.

[edit] Capabilities

[edit] OpenSimulator specific

OpenSimulator provides information about OpenSimulator-specific features or extra parameters via the SimulatorFeatures capability. See the SimulatorFeatures Extras page for more information.

[edit] General

These are capabilities that are provided by the Linden Lab viewer client (and hence in most third-party viewers). Many are implemented by OpenSimulator but others are not, sometimes because they are obsolete (TODO: Need to fill out information below about specifically what is implemented and what is not).

Name Description
AttachmentResources appears to be associated with determining limits on scripts in agent attachments.
AvatarPickerSearch
ChatSessionRequest
CopyInventoryFromNotecard
DispatchRegionInfo
EstateAccess
EstateChangeInfo
EnvironmentSetting
EventQueueGet used for the event queue.
FetchInventory obsolete
FetchInventory2 see Inventory capabilities
FetchInventoryDescendents2 see Inventory capabilities
FetchLib2 see Inventory capabilities
FetchLibDescendents2 see Inventory capabilities.
FetchLib Obsolete
FetchLibDescendents Obsolete
GetDisplayNames
GetMesh used to get mesh data
GetMesh2 used to get mesh data
GetObjectCost
GetObjectPhysicsData
GetTexture used to get texture data via HTTP instead of via UDP. See Texture capabilities.
GroupMemberData
GroupProposalBallot
HomeLocation
LandResources
MapLayer
MapLayerGod
NewFileAgentInventory
NewFileAgentInventoryVariablePrice
ObjectAdd
ObjectMedia used to get information about a media on a prim (MOAP)/shared media texture/surface.
ObjectMediaNavigate used to change web pages, etc., on a MOAP surface
ParcelPropertiesUpdate
ParcelMediaURLFilterList
ParcelNavigateMedia
ParcelVoiceInfoRequest
ProductInfoRequest
ProvisionVoiceAccountRequest
RemoteParcelRequest
RequestTextureDownload
SearchStatRequest
SearchStatTracking
SendPostcard
SendUserReport
SendUserReportWithScreenshot
ServerReleaseNotes
SetDisplayName
SimConsoleAsync used for the simulator console
SimulatorFeatures used to get information about what simulator features are available. This currently includes MeshRezEnabled and MeshUploadEnabled. OpenSimulator can also provide OpenSimulator-specific feature information and parameters. See SimulatorFeatures Extras for more information.
StartGroupProposal
TextureStats
UntrustedSimulatorMessage
UpdateAgentInformation
UpdateAgentLanguage
UpdateGestureAgentInventory
UpdateNotecardAgentInventory
UpdateScriptAgent
UpdateGestureTaskInventory
UpdateNotecardTaskInventory
UpdateScriptTask
UploadBakedTexture Used to upload avatar baked textures via HTTP rather than UDP
UploadObjectAsset
ViewerStartAuction
ViewerStats Used to upload viewer statistics (cpu usage, fps, etc.)
WebFetchInventoryDescendents Obsolete

[edit] Enabling and Disabling

Capabilities are enabled and disabled in OpenSimulator by setting a property with the name Cap_<attachment-name> in the [ClientStack.LindenCaps] configuration setting of OpenSim.ini. If the value is "localhost" then it is served by the same simulator in which the viewer has it's root agent (its avatar). If the value is "" or the capability parameter is not present then it is disabled. The value can also be set to a URL to serve the capability directly from such other location, but this option is currently experimental and not documented.

For instance, to disable the GetTexture capability, one would set

[ClientStack.LindenCaps]
Cap_GetTexture = ""

and to enable it

[ClientStack.LindenCaps]
Cap_GetTexture = "localhost"

There are also a large number of default capabilities set up in the OpenSimDefaults.ini file. As with other configuration settings, these will be overwritten by anything you set in the OpenSim.ini file.

[edit] Mechanism

Here's a brief description of the mechanism by which a viewer entering a region is provided with capability endpoints on first login. The mechanism is slightly different when user moves between regions after login - this has yet to be documented.

  1. The client requests login to the installation's login service.
  2. The login service generates the seed capability. This is an URL with a random component which is made available by the simulator hosting the login destination. The URL is given to the viewer as part of the login reply (seed_capability). See SimulatorLoginProtocol for more details.
  3. The client establishes an initial child connection with the simulator with the UseCircuitCode UDP message. The server triggers individual modules to register capabilities as required (e.g. the GetTextureModule registers a GetTexture capability, etc.). As before, these capabilities have a random component.
  4. The client sends a request to the seed capability provided earlier, requesting a set of capabilities (GetTexture, etc.). The simulator replies with the required capability URLs.
  5. The client can then make requests to specific capabilites.

You can see the capabilities set up with the "show caps list" simulator console command. Here's some example output from a test 0.9.2.0 Yeti.

Region (root) # show caps list
Region ubittest11:
** Circuit 1881454533:
   UpdateGestureTaskInventory             /CAPS/8f912ed8-7072-40e6-ac27-7861f8eb5425
   UploadBakedTexture                     /CAPS/e7762177-b2d1-41c7-ba9d-4d5953883c1b0010/
   GroupMemberData                        /CAPS/8ba20145-932e-4545-9f41-1588b1d7120b
   AgentPreferences                       /CAPS/449dcf05-aeba-4613-9fb7-cc154a17671a
   ObjectMedia                            /CAPS/250c3ad6-6515-485a-8391-6581599163ac
   HomeLocation                           /CAPS/eda48829-7713-4f29-a873-a49ff1e28cce
   UpdateScriptAgentInventory             /CAPS/8f912ed8-7072-40e6-ac27-7861f8eb5425
   MapLayer                               /CAPS/ff37d443-2acc-4bdc-b35f-1c14480f0132
   ServerReleaseNotes                     /CAPS/2c57351f-e9b2-4223-ba10-2324b8f807c0/
   ProvisionVoiceAccountRequest           /CAPS/e7762177-b2d1-41c7-ba9d-4d5953883c1b0108/
   ObjectMediaNavigate                    /CAPS/301278a3-49e6-46bf-a1c2-661fa97427f8
   UpdateScriptTaskInventory              /CAPS/fcc995fb-1dfb-443e-aae9-933a17f03161
   AvatarPickerSearch                     /CAPS/3d348ccb-7fda-4927-905b-e27e9d18db74/
   ExtEnvironment                         /CAPS/f8d1a848-99f0-4cac-9293-f74a790a0dff/
   UpdateScriptTask                       /CAPS/fcc995fb-1dfb-443e-aae9-933a17f03161
   GetDisplayNames                        /CAPS/bd0f7c2d-6c5a-4e96-b998-9f8a6777c715
   CopyInventoryFromNotecard              /CAPS/6fe40ffb-88f1-4483-963e-b5f94b9b60b3
   FetchInventory2                        /CAPS/72be4350-439a-41c9-9782-2f2f402ec61b
   RenderMaterials                        /CAPS/e7762177-b2d1-41c7-ba9d-4d5953883c1b/
   UpdateSettingsAgentInventory           /CAPS/8f912ed8-7072-40e6-ac27-7861f8eb5425
   GetObjectCost                          /CAPS/3084898a-5ea9-48ab-a879-1e6c3609ade1
   UpdateNotecardAgentInventory           /CAPS/8f912ed8-7072-40e6-ac27-7861f8eb5425
   ParcelVoiceInfoRequest                 /CAPS/e7762177-b2d1-41c7-ba9d-4d5953883c1b0107/
   GetObjectPhysicsData                   /CAPS/6f9fd433-2b8b-458f-8340-49a34ec28d77
   UpdateAgentInformation                 /CAPS/449dcf05-aeba-4613-9fb7-cc154a17671a
   UpdateSettingsTaskInventory            /CAPS/8f912ed8-7072-40e6-ac27-7861f8eb5425
   UpdateAnimSetAgentInventory            /CAPS/8f912ed8-7072-40e6-ac27-7861f8eb5425
   UpdateAgentLanguage                    /CAPS/449dcf05-aeba-4613-9fb7-cc154a17671a
   SimulatorFeatures                      /CAPS/fe9a00a1-2025-4243-bc20-ba780b309216
   EstateChangeInfo                       /CAPS/f8ef6e17-887c-47b2-afa4-bc6f348ac533/
   UpdateGestureAgentInventory            /CAPS/8f912ed8-7072-40e6-ac27-7861f8eb5425
   EstateAccess                           /CAPS/c6a89434-da8c-4ca5-91ce-0f6d50b01127/
   LSLSyntax                              /CAPS/84363df8-df9d-4d20-aa6e-f898c37a4e6b
   ParcelPropertiesUpdate                 /CAPS/8c22f06e-8174-482a-8923-e553a7a26ac2
   CreateInventoryCategory                /CAPS/0464839f-a53b-40e4-ba67-e5e51ee586bd
   ObjectAdd                              /CAPS/280c3b36-e1cf-430d-ab2e-3b555d382c78/
   ResourceCostSelected                   /CAPS/9847b0d8-21da-4c23-9743-970dee156bb8
   UpdateScriptAgent                      /CAPS/8f912ed8-7072-40e6-ac27-7861f8eb5425
   RemoteParcelRequest                    /CAPS/0939a467-aa93-42fb-b108-fd0ad4ea5c73
   NewFileAgentInventory                  /CAPS/402dbdf7-e67a-4ab4-88b4-082700407971
   SEED                                   /CAPS/e7762177-b2d1-41c7-ba9d-4d5953883c1b0000/
   CustomMenuAction                       /CAPS/3f756ad1-539e-4873-a1af-d27642fe025b/
   EnvironmentSettings                    /CAPS/e9f38618-e9aa-4bd5-86c3-dd0f8f8e5a45/
   UpdateNotecardTaskInventory            /CAPS/8f912ed8-7072-40e6-ac27-7861f8eb5425
   UploadObjectAsset                      /CAPS/02c0f42f-22e6-46a2-b892-4d8fd3e12097/
   UntrustedSimulatorMessage              /CAPS/7abbc33f-9371-4e49-91bb-280843ab3210
   SimConsoleAsync                        /CAPS/abb4ded1-9132-4e29-ab53-4fa13b1e3dfa/
   MeshUploadFlag                         /CAPS/2ed68e7d-1637-4acb-8f0e-2c559fcd5238
   EventQueueGet                          /CAPS/EQG/d23c8b9e-cf17-46af-a8cb-b887e4fa9f5b/
   FetchInventoryDescendents2             /CAPS/3e19ee86-0ed1-4b20-a92a-94882652c03e/
   GetTexture                             (deleted url)/CAPS/c27e9aa2-3b78-4d90-bc60-e977e9c3f3a3/
   GetMesh                                (deleted url)/CAPS/61e945a7-c054-493e-8939-56f40ca09856/
   GetMesh2                               (deleted url)/CAPS/59b7a937-af83-4d4e-9c38-42a28e1f2160/
   ViewerAsset                            (deleted url)/CAPS/0c86e85c-4f1a-443d-8950-d1e0832db88f/

Note 1: ViewerAsset cap should be disabled util Firestorm 6.0.x is replaced
Note 2: ExtEnvironment cap may not endup on releases
NOTE 3: Caps format may change

Here, the SEED capability is the initial capability from which to request the others.

There are some advanced configurations that can serve capabilities directly from services (see the section below for more details). However, these currently cannot generate the random capability component. In the future, there may be some mechanism to allow this though at the cost of increasing the complexity of the system.

[edit] Serving capabilities from services

Normally, capabilities are served from the simulator. However, for the GetTexture service (and more in future, such as the GetMesh service), the request can be handled directly from a Robust service instance operating on a port accessible to the viewer. See Direct Service Requests for more information on this.

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