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Extended return type of invokeAction() #561

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Extended return type of invokeAction() #561

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8ab29ca
refactor: start experimenting with extending invokeAction
danielpeintner Aug 26, 2024
b73fdb1
refactor: improve initial text
danielpeintner Aug 26, 2024
bb69456
refactor: remove ActionStatus "pending"
danielpeintner Oct 14, 2024
54a2f50
Update index.html
danielpeintner Oct 15, 2024
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69 changes: 66 additions & 3 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -1275,7 +1275,70 @@ <h2>The <dfn>InteractionOutput</dfn> interface</h2>
</ol>
</section>
</section>
<section> <h3>Using {{InteractionInput}} and {{InteractionOutput}}</h3>

<section data-dfn-for="ActionInteractionOutput">
<h2>The <dfn>ActionInteractionOutput</dfn> interface</h2>
<p>
Belongs to the <a>WoT Consumer</a> conformance class.
An {{ActionInteractionOutput}} object is always created by the implementations
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and exposes functionality to interact with long running (asynchronous) actions.<br />
Note: a synchronous action MAY not offer any <emph>additional</emph> sensible interaction beyond the ones from {{InteractionOutput}}.
</p>
<p>
This interface exposes an action status object. Its implementation
will allow cancelling asynchronous actions and report the status of a long running action.
</p>
<pre class="idl">
enum ActionStatus {
"running",
"success",
"error"
};

[SecureContext, Exposed=(Window,Worker)]
interface ActionInteractionOutput : InteractionOutput {
readonly attribute object? error;
Promise&lt;ActionStatus&gt; status();
Promise&lt;undefined&gt; cancel();
};
</pre>
<p>
The <dfn>error</dfn> property represents a possible error, initially `null`.
</p>
<p class="ednote" title="Should state be a function or an attribute only?">
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I started with a function but I start thinking an attribute should be sufficient..

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An action is supposed to be always polled? Or could a script subscribe just for changes in status?

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I think observing state changes would be nice but I am not sure whether that is actually necessary...

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Mhh, I tend to think now that a a function for reporting the status would be more powerful and useful. What do people think? Other ideas?

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Mhh, I tend to think now that a a function for reporting the status would be more powerful and useful. What do people think? Other ideas?

Hmm, if I see it correctly, we could also treat the attribute as a getter and add more logic to that if needed, right?

Or could a script subscribe just for changes in status?

If we wanted to that, what would be the best way to model that? Adding a way for registering a callback function?

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Mhh, maybe we should decide what we need/want from the status

  • is it likely that requesting the status may take a while? (or put differently do we need a Promise)
  • do we need a way to observe a status change (would be nice but adds complexity)

My take is that having a promise function for status() is fine while I am not 100% sure we should allow for listening status changes...

Are there opinions/proposals?


</p>
<p class="ednote" title="Additional action object functions needed?">
Should we allow pause/resume also? TD has no notion of it.
</p>
<section><h3>The <dfn>status()</dfn> function</h3>
Reports the status of an <a>Action</a> (one of <code>running</code>, <code>success</code> or <code>error</code>) or rejects on error. The method MUST run the following steps:
<ol>
<li>
Return a {{Promise}} |promise:Promise| and execute the next steps
[=in parallel=].
</li>
<li>
TODO
</li>
</ol>
</section>
<section><h3>The <dfn>cancel()</dfn> function</h3>
Cancels a running WoT <a>Action</a> or rejects on error. The method MUST run the following steps:
<ol>
<li>
Return a {{Promise}} |promise:Promise| and execute the next steps
[=in parallel=].
</li>
<li>
TODO ... applicable when the state is running
</li>
</ol>
</section>

</section>

<section> <h3>Using {{InteractionInput}}, {{InteractionOutput}} and {{ActionInteractionOutput}}</h3>
<p>
As illustrated in the next pictures, the {{InteractionOutput}} interface
is used every time implementations provide data to scripts, while
Expand Down Expand Up @@ -1323,7 +1386,7 @@ <h2>The <dfn>InteractionOutput</dfn> interface</h2>
<p>
When a {{ConsumedThing}} invokes an <a>Action</a>, it provides the
parameters as {{InteractionInput}} and receives the output of the
<a>Action</a> as an {{InteractionOutput}} object.
<a>Action</a> as an {{ActionInteractionOutput}} object.
</p>
<p>
An {{ExposedThing}} <a href="#the-actionhandler-callback">
Expand Down Expand Up @@ -1386,7 +1449,7 @@ <h2>The <dfn>ConsumedThing</dfn> interface</h2>
/*Promise&lt;undefined&gt; writeAllProperties(
PropertyWriteMap valueMap,
optional InteractionOptions options = {});*/
Promise&lt;InteractionOutput&gt; invokeAction(DOMString actionName,
Promise&lt;ActionInteractionOutput&gt; invokeAction(DOMString actionName,
optional InteractionInput params = {},
optional InteractionOptions options = {});
Promise&lt;Subscription&gt; observeProperty(DOMString name,
Expand Down
12 changes: 10 additions & 2 deletions typescript/scripting-api/index.d.ts
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Expand Up @@ -88,6 +88,14 @@ declare namespace WoT {
value(): Promise<DataSchemaValue>;
}

export enum ActionStatus { "running", "success", "error" }

export interface ActionInteractionOutput extends InteractionOutput {
error?: Error;
status(): Promise<ActionStatus>
cancel(): Promise<void>
}

export interface Subscription {
active:boolean,
stop(options?: InteractionOptions):Promise<void>
Expand Down Expand Up @@ -140,9 +148,9 @@ declare namespace WoT {
* Makes a request for invoking an Action and return the result.
* Takes as arguments actionName, optionally params and optionally options.
* It returns a Promise that resolves with the result of the Action represented
* as an InteractionOutput object, or rejects with an error.
* as an ActionInteractionOutput object, or rejects with an error.
*/
invokeAction(actionName: string, params?: InteractionInput, options?: InteractionOptions): Promise<undefined | InteractionOutput>;
invokeAction(actionName: string, params?: InteractionInput, options?: InteractionOptions): Promise<undefined | ActionInteractionOutput>;

/**
* Makes a request for Property value change notifications.
Expand Down