Avatar portability version 2

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__NOTOC__
 
__NOTOC__
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{{Template:Quicklinks}}
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{{Quicklinks}}
  
 
{{proposal}}
 
{{proposal}}
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=== definition ===
 
=== definition ===
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*User U1 resgitered at GridService G1
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* User U1 resgitered at GridService G1
 
** U1's inventory information is stored in InventoryServer I1
 
** U1's inventory information is stored in InventoryServer I1
 
** U1's assets are stored in AssetServer As1
 
** U1's assets are stored in AssetServer As1
 
** U1's appearance information is served by AvatarService Av1
 
** U1's appearance information is served by AvatarService Av1
  
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*RegionServer R2 serves a sim at GridService G2
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* RegionServer R2 serves a sim at GridService G2
 
** R2 fetches assets from Assetserver As2 by default.  
 
** R2 fetches assets from Assetserver As2 by default.  
 
** R2 gets inventory information from InventoryServer I2 by default.
 
** R2 gets inventory information from InventoryServer I2 by default.
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[[Image:avatar_portability_v2_1.PNG]]
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[[File:avatar_portability_v2_1.PNG]]
  
 
=== avatar portability ===
 
=== avatar portability ===
  
 
AvatarPortability (or called "grid interoperability") is
 
AvatarPortability (or called "grid interoperability") is
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*U1 login to R2
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* U1 login to R2
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**U1's appearance at G1 can be seen from any other client which is connecting to R2.
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** U1's appearance at G1 can be seen from any other client which is connecting to R2.
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**U1 can CRUD(Create/Read/Update/Delete) its inventory/appearance through R2.
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** U1 can CRUD(Create/Read/Update/Delete) its inventory/appearance through R2.
  
 
This means, (in the fig. 2) R2 should have the ability to connect not only its default
 
This means, (in the fig. 2) R2 should have the ability to connect not only its default
 
UGAI server, but also external Inventory, Asset, Avatar service.
 
UGAI server, but also external Inventory, Asset, Avatar service.
  
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[[Image:avatar_portability_v2_2.PNG]]
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[[File:avatar_portability_v2_2.PNG]]
  
 
'''Then "AvatarPortability" can be subdivided into 2 goals:'''
 
'''Then "AvatarPortability" can be subdivided into 2 goals:'''
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more information can be found at:
 
more information can be found at:
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*http://en.wikipedia.org/wiki/Yadis
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* http://en.wikipedia.org/wiki/Yadis
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*http://en.wikipedia.org/wiki/XRDS
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* http://en.wikipedia.org/wiki/XRDS
  
 
A sample XRDS for U1 can be like:
 
A sample XRDS for U1 can be like:
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   </xrds:XRDS>
 
   </xrds:XRDS>
  
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*There are more than one way can be considered to pass U1's XRDS file to R2
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* There are more than one way can be considered to pass U1's XRDS file to R2
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**[[OpenID for data portability in virtual world]]
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** [[OpenID for data portability in virtual world]]
  
 
REASONS for proposing XRDS
 
REASONS for proposing XRDS
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Why it is a problem ? The asset download process is described below:
 
Why it is a problem ? The asset download process is described below:
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*RegionServer sends user/prims' Texture UUID to the client.
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* RegionServer sends user/prims' Texture UUID to the client.
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*Client extract the UUIDs, and sends a "RequestImagePacket" to request the actual asset data.
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* Client extract the UUIDs, and sends a "RequestImagePacket" to request the actual asset data.
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*RegionServer receives the AssetUUID and passes it to AssetServer to get the asset.
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* RegionServer receives the AssetUUID and passes it to AssetServer to get the asset.
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[[Image:avatar_portability_v2_3-1.PNG]]
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[[File:avatar_portability_v2_3-1.PNG]]
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*Considering only 1 GridService, there is no problem, but if RegionServer knows more than 1 asset server, RegionServer has to determine which assetserver should be used.
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* Considering only 1 GridService, there is no problem, but if RegionServer knows more than 1 asset server, RegionServer has to determine which assetserver should be used.
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*Here '''ForeignAssetHashTable''' is used to solve this problem. (The detailed implementation is shown in following section.)
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* Here '''ForeignAssetHashTable''' is used to solve this problem. (The detailed implementation is shown in following section.)
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*#when U1 login to R2, R2 register U1's owned asset UUIDs to "ForeignAssetHashTable".
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*# when U1 login to R2, R2 register U1's owned asset UUIDs to "ForeignAssetHashTable".
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*#Client sends a RequestImagePacket
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*# Client sends a RequestImagePacket
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*#R2 looks up into "ForeignAssetHashTable" to find the AssetServerUrl,(if not found, returns the default url)
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*# R2 looks up into "ForeignAssetHashTable" to find the AssetServerUrl,(if not found, returns the default url)
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*#R2 use the returned AssetServerUrl to get asset data.
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*# R2 use the returned AssetServerUrl to get asset data.
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[[Image:avatar_portability_v2_3.PNG]]
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[[File:avatar_portability_v2_3.PNG]]
  
 
== Implementation ==
 
== Implementation ==
  
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*All the implementation described here are already finished
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* All the implementation described here are already finished
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**The testing environment will be made public after solving the "[[security vulnerability brought by non-check inventory service|security]]" issues.
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** The testing environment will be made public after solving the "[[security vulnerability brought by non-check inventory service|security]]" issues.
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*Just for appearance portability, asseturl and inventoryurl are enough, so temporarily just use the 2 existing properties.
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* Just for appearance portability, asseturl and inventoryurl are enough, so temporarily just use the 2 existing properties.
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*XRDS is not implemented
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* XRDS is not implemented
  
 
=== 1 Implementation - ForeginAssetHashTable.Add ===
 
=== 1 Implementation - ForeginAssetHashTable.Add ===
  
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[[Image:avatar_portability_4-1.PNG]]
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[[File:avatar_portability_4-1.PNG]]
  
 
=== 2 Implementation - ForeginAssetHashTable.Get ===
 
=== 2 Implementation - ForeginAssetHashTable.Get ===
  
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[[Image:avatar_portability_4-2.PNG]]
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[[File:avatar_portability_4-2.PNG]]
  
 
=== 3 Implementation - ForeginAssetHashTable.Remove ===
 
=== 3 Implementation - ForeginAssetHashTable.Remove ===
  
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[[Image:avatar_portability_4-3.PNG]]
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[[File:avatar_portability_4-3.PNG]]

Latest revision as of 20:43, 3 March 2012

Languages Languages: 

En.png English

48x48

This article or section is a Proposal
It does not represent the current state of OpenSim, but is an idea for future work in OpenSim. Please feel free to update this page as part of the proposal discussion.
User:Lulurun

[edit] Agenda

To enable user avatar travel from a grid service to another grid service, There are 3 problems to be considered:

  1. How to enable foreign user login - Authentication
  2. (If a foreign user can login)How to get a foreign user's belongings(including appearance, inventory)
    • This is discussed in this page
  3. Security

To achieve the 1st, client side changes are needed. SO, so far, I have only implemented the 2nd and the 3rd, and would like to explan my idea:

[edit] Basic Idea

[edit] definition

  • User U1 resgitered at GridService G1
    • U1's inventory information is stored in InventoryServer I1
    • U1's assets are stored in AssetServer As1
    • U1's appearance information is served by AvatarService Av1
  • RegionServer R2 serves a sim at GridService G2
    • R2 fetches assets from Assetserver As2 by default.
    • R2 gets inventory information from InventoryServer I2 by default.

Avatar portability v2 1.PNG

[edit] avatar portability

AvatarPortability (or called "grid interoperability") is

  • U1 login to R2
    • U1's appearance at G1 can be seen from any other client which is connecting to R2.
    • U1 can CRUD(Create/Read/Update/Delete) its inventory/appearance through R2.

This means, (in the fig. 2) R2 should have the ability to connect not only its default UGAI server, but also external Inventory, Asset, Avatar service.

Avatar portability v2 2.PNG

Then "AvatarPortability" can be subdivided into 2 goals:

  1. How to let R2 know where are U1's storage services(Inventory,Asset,Avatar,...) ?
  2. How to enable R2 to interact with mutilple Inventory/Asset/Avatar services ?

[edit] Answer to the 1st How to - XRDS

more information can be found at:

A sample XRDS for U1 can be like: 

 <?xml version="1.0" encoding="UTF-8"?>
 <xrds:XRDS xmlns:xrds="xri://$xrds" xmlns="xri://$xrd*($v*2.0)">
  <XRD>
    <Service priority="0">
      <Type>http://opensim.org/profileservice/1.0</Type>
      <URI>http://osgrid.org:8002/GetUserProfile/12345678-1234-1234-1234-12345678abcd</URI>
    </Service>
    <Service priority="0">
      <Type>http://opensim.org/authservice/1.0</Type>
      <URI>http://osgrid.org:8002/session/12345678-1234-1234-1234-12345678abcd</URI>
    </Service>
    <Service priority="0">
      <Type>http://opensim.org/assetservice/1.0</Type>
      <URI>http://osgrid.org:8003</URI>
    </Service>
    <Service priority="0">
      <Type>http://opensim.org/inventoryservice/1.0</Type>
      <URI>http://osgrid.org:8004</URI>
    </Service>
    <Service priority="0">
      <Type>http://opensim.org/avatarservice/1.0</Type>
      <URI>http://osgrid.org:8005</URI>
    </Service>
  </XRD>
 </xrds:XRDS>

REASONS for proposing XRDS

  1. There are "UserAssetUrl" and "UserInventoryUrl" in "Users" table, they are cab be used to specify users' storage services, but it's lack of scalability, to think we may have "friend service", "currency service", ... we can not simply add a column for each service.
  2. XRDS is widly used, many languages has libs for discovering/parsing it. To use XRDS can increase the compatibility　with existing(web) service
  3. XRDS is just a proposal, still, we have many other choices.

[edit] Answer to the 2nd How to - ForeignAssetHashTable

Why it is a problem ? The asset download process is described below:

  • RegionServer sends user/prims' Texture UUID to the client.
  • Client extract the UUIDs, and sends a "RequestImagePacket" to request the actual asset data.
  • RegionServer receives the AssetUUID and passes it to AssetServer to get the asset.

Avatar portability v2 3-1.PNG

  • Considering only 1 GridService, there is no problem, but if RegionServer knows more than 1 asset server, RegionServer has to determine which assetserver should be used.
  • Here ForeignAssetHashTable is used to solve this problem. (The detailed implementation is shown in following section.)
    1. when U1 login to R2, R2 register U1's owned asset UUIDs to "ForeignAssetHashTable".
    2. Client sends a RequestImagePacket
    3. R2 looks up into "ForeignAssetHashTable" to find the AssetServerUrl,(if not found, returns the default url)
    4. R2 use the returned AssetServerUrl to get asset data.

Avatar portability v2 3.PNG

[edit] Implementation

  • All the implementation described here are already finished
    • The testing environment will be made public after solving the "security" issues.
  • Just for appearance portability, asseturl and inventoryurl are enough, so temporarily just use the 2 existing properties.
  • XRDS is not implemented

[edit] 1 Implementation - ForeginAssetHashTable.Add

Avatar portability 4-1.PNG

[edit] 2 Implementation - ForeginAssetHashTable.Get

Avatar portability 4-2.PNG

[edit] 3 Implementation - ForeginAssetHashTable.Remove

Avatar portability 4-3.PNG

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