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@kriswest kriswest commented Apr 17, 2025

Describe your change

Proposal stub for getSubAgent - raised to show where additions to the FDC3 Standard will be needed to handle the linked issues and to facilitate collaboration. Please feel free to raise PRs into the getSubAgent-proposal branch or comment and make suggestions to apply on the Files changed tab of this PR:

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For more info making suggestions through PR reviews see GitHub's docs: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/commenting-on-a-pull-request#adding-comments-to-a-pull-request

Related Issue

resolves #1250
resolves #1263

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  • I acknowledge that a contributor license agreement is required and that I have one in place or will seek to put one in place ASAP.

Review Checklist

  • Issue: If a change was made to the FDC3 Standard, was an issue linked above?
  • CHANGELOG: Is a CHANGELOG.md entry included?
  • API changes: Does this PR include changes to any of the FDC3 APIs (DesktopAgent, Channel, PrivateChannel, Listener, Bridging)?
    • Docs & Sources: If yes, were both documentation (/docs) and sources updated?

      JSDoc comments on interfaces and types should be matched to the main documentation in /docs
    • Conformance tests: If yes, are conformance test definitions (/toolbox/fdc3-conformance) still correct and complete?

      Conformance test definitions should cover all required aspects of an FDC3 Desktop Agent implementation, which are usually marked with a MUST keyword, and optional features (SHOULD or MAY) where the format of those features is defined
    • Schemas: If yes, were changes applied to the Bridging and FDC3 for Web protocol schemas?

      The Web Connection protocol and Desktop Agent Communication Protocol schemas must be able to support all necessary aspects of the Desktop Agent API, while Bridging must support those aspects necessary for Desktop Agents to communicate with each other
      • If yes, was code generation (npm run build) run and the results checked in?

        Generated code will be found at /src/api/BrowserTypes.ts and/or /src/bridging/BridgingTypes.ts
  • Context types: Were new Context type schemas created or modified in this PR?
    • Were the field type conventions adhered to?
    • Was the BaseContext schema applied via allOf (as it is in existing types)?
    • Was a title and description provided for all properties defined in the schema?
    • Was at least one example provided?
    • Was code generation (npm run build) run and the results checked in?

      Generated code will be found at /src/context/ContextTypes.ts
  • Intents: Were new Intents created in this PR?

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github-actions bot commented Apr 17, 2025

Coverage Report

Commit: 3bdfe7b
Base: main@9c5ea8f

Type Base This PR
Total Statements Coverage  97.66%  97.66% (+0%)
Total Branches Coverage  87.07%  87.07% (+0%)
Total Functions Coverage  96.65%  96.65% (+0%)
Total Lines Coverage  97.74%  97.74% (+0%)
Details (changed files)
FileStatementsBranchesFunctionsLines
Details (all files)
FileStatementsBranchesFunctionsLines
packages/fdc3-agent-proxy/src/DesktopAgentProxy.ts 100% 100% 100% 100%
packages/fdc3-agent-proxy/src/index.ts 100% 100% 62.5% 100%
packages/fdc3-agent-proxy/src/apps/DefaultAppSupport.ts 88% 50% 100% 88%
packages/fdc3-agent-proxy/src/channels/DefaultChannel.ts 100% 100% 100% 100%
packages/fdc3-agent-proxy/src/channels/DefaultChannelSupport.ts 98.71% 100% 94.44% 100%
packages/fdc3-agent-proxy/src/channels/DefaultPrivateChannel.ts 97.29% 66.66% 100% 97.29%
packages/fdc3-agent-proxy/src/heartbeat/DefaultHeartbeatSupport.ts 100% 100% 100% 100%
packages/fdc3-agent-proxy/src/intents/DefaultIntentResolution.ts 100% 100% 100% 100%
packages/fdc3-agent-proxy/src/intents/DefaultIntentSupport.ts 100% 100% 100% 100%
packages/fdc3-agent-proxy/src/listeners/AbstractListener.ts 100% 60% 100% 100%
packages/fdc3-agent-proxy/src/listeners/DefaultContextListener.ts 100% 90% 100% 100%
packages/fdc3-agent-proxy/src/listeners/DefaultIntentListener.ts 100% 77.77% 100% 100%
packages/fdc3-agent-proxy/src/listeners/EventListener.ts 100% 100% 100% 100%
packages/fdc3-agent-proxy/src/listeners/HeartbeatListener.ts 100% 100% 100% 100%
packages/fdc3-agent-proxy/src/listeners/PrivateChannelEventListener.ts 93.33% 72.72% 100% 93.33%
packages/fdc3-agent-proxy/src/messaging/AbstractMessaging.ts 94.59% 100% 80% 94.59%
packages/fdc3-agent-proxy/src/util/AbstractFDC3Logger.ts 100% 94.11% 100% 100%
packages/fdc3-agent-proxy/src/util/Logger.ts 100% 100% 100% 100%
packages/fdc3-agent-proxy/src/util/throwIfUndefined.ts 100% 100% 100% 100%
packages/fdc3-get-agent/src/index.ts 100% 100% 28.57% 100%
packages/fdc3-get-agent/src/messaging/MessagePortMessaging.ts 100% 100% 100% 100%
packages/fdc3-get-agent/src/messaging/message-port.ts 97.43% 86.66% 100% 97.43%
packages/fdc3-get-agent/src/sessionStorage/DesktopAgentDetails.ts 97.36% 89.47% 100% 97.36%
packages/fdc3-get-agent/src/strategies/DesktopAgentPreloadLoader.ts 100% 77.77% 100% 100%
packages/fdc3-get-agent/src/strategies/FailoverHandler.ts 100% 76.47% 100% 100%
packages/fdc3-get-agent/src/strategies/HelloHandler.ts 94% 81.25% 100% 94%
packages/fdc3-get-agent/src/strategies/IdentityValidationHandler.ts 95.65% 73.33% 100% 95.65%
packages/fdc3-get-agent/src/strategies/PostMessageLoader.ts 98.48% 86.95% 100% 98.46%
packages/fdc3-get-agent/src/strategies/Timeouts.ts 100% 100% 100% 100%
packages/fdc3-get-agent/src/strategies/getAgent.ts 100% 100% 100% 100%
packages/fdc3-get-agent/src/ui/AbstractUIComponent.ts 97.14% 71.42% 100% 97.01%
packages/fdc3-get-agent/src/ui/DefaultDesktopAgentChannelSelector.ts 100% 75% 100% 100%
packages/fdc3-get-agent/src/ui/DefaultDesktopAgentIntentResolver.ts 100% 90% 100% 100%
packages/fdc3-get-agent/src/ui/NullChannelSelector.ts 100% 100% 100% 100%
packages/fdc3-get-agent/src/ui/NullIntentResolver.ts 100% 100% 66.66% 100%
packages/fdc3-get-agent/src/util/Logger.ts 100% 100% 100% 100%
packages/fdc3-get-agent/src/util/Uuid.ts 100% 100% 100% 100%
packages/fdc3-standard/src/index.ts 100% 100% 0% 100%
packages/fdc3-standard/src/api/Errors.ts 100% 100% 100% 100%
packages/fdc3-standard/src/api/GetAgent.ts 100% 100% 100% 100%
packages/fdc3-standard/src/api/Methods.ts 94.04% 84.05% 96.29% 95%
packages/fdc3-standard/src/api/RecommendedChannels.ts 100% 100% 100% 100%
packages/fdc3-standard/src/context/ContextType.ts 100% 100% 100% 100%
packages/fdc3-standard/src/intents/Intents.ts 100% 100% 100% 100%
packages/fdc3-standard/src/internal/contextConfiguration.ts 100% 100% 100% 100%
packages/fdc3-standard/src/internal/intentConfiguration.ts 100% 100% 100% 100%
packages/fdc3-standard/src/internal/typeHelpers.ts 100% 100% 100% 100%
toolbox/fdc3-for-web/fdc3-web-impl/src/BasicFDC3Server.ts 100% 100% 100% 100%
toolbox/fdc3-for-web/fdc3-web-impl/src/ServerContext.ts 100% 100% 100% 100%
toolbox/fdc3-for-web/fdc3-web-impl/src/directory/BasicDirectory.ts 96.87% 84.21% 100% 96.55%
toolbox/fdc3-for-web/fdc3-web-impl/src/handlers/BroadcastHandler.ts 96.38% 86.41% 100% 96.12%
toolbox/fdc3-for-web/fdc3-web-impl/src/handlers/HeartbeatHandler.ts 88.23% 71.87% 86.66% 90%
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toolbox/fdc3-for-web/fdc3-web-impl/src/handlers/OpenHandler.ts 97.14% 86.84% 100% 97.14%
toolbox/fdc3-for-web/fdc3-web-impl/src/handlers/support.ts 100% 100% 100% 100%

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<!-- TODO: Describe the use-case for sub-agents without being overly focused on a particular platform (could make sense in web apps and monolithic apps built in other languages.
Ensure routing of channel messages and intent resolution are covered.
-->

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@Roaders Roaders Apr 25, 2025

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Suggested change
In some scenarios, it may be necessary to load more than one `DesktopAgent` into the context of a single application or browser window (for web-based applications). This is particularly relevant in the context of micro-frontends, where different applications within the same window may need to communicate with each other.
Using a single `DesktopAgent` per window does not allow separate applications within the same browser window to communicate with each other (this limitation does not apply if the application is loaded into an iframe which is considered to be a different browser window).
To address this, sub-applications can use **sub-agents**. Sub-agents allow different sub-applications within a single window to communicate with each other. Here's an example of how to create and use a sub-agent:
```ts
const subAgent: DesktopAgent = await (await getAgent()).getSubAgent({appId: "[email protected]"});
subAgent.raiseIntent("StartChat", context);

This approach enables seamless communication between sub-agents in the same window.

*/
getAppMetadata(app: AppIdentifier): Promise<AppMetadata>;

// TODO: add getSubAgent definition
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/**

Suggested change
// TODO: add getSubAgent definition
* @param {string} params Required parameters object, which must include
* at least a fully qualified appId or appD URL for the application to
* indicate the app's identity.
* @param {string} params.appId The fully qualified appId
* (in the form appid@<appd origin> for the application
* @param {URL} params.appDUrl The URL to the appD record providing the
* app's identity, used as an alternative to a fully qualified appId.
*
* @return A promise that resolves to a DesktopAgent implementation or
* rejects if the app identity could not be validated.
*/
getSubAgent (params: GetSubAgentParams): Promise<DesktopAgent>;

open(app: AppIdentifier, context?: Context): Promise<AppIdentifier>;
findInstances(app: AppIdentifier): Promise<Array<AppIdentifier>>;
getAppMetadata(app: AppIdentifier): Promise<AppMetadata>;
// TODO: add getSubAgent
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Suggested change
// TODO: add getSubAgent
getSubAgent (params: GetSubAgentParams): Promise<DesktopAgent>;

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Question: Disposal/Teardown patterns in FDC3 Support for Multiple Application Scopes (Agents) within a single window process

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