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Add async initialization to ChangeSetFileElement #15761

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Merged
colin-grant-work merged 2 commits into from
Jun 6, 2025
Merged

Add async initialization to ChangeSetFileElement #15761

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0ab9d27
Add async initialization to ChangeSetFileElement
AlexandraBuzila Jun 5, 2025
2069d0e
Address review comments
AlexandraBuzila Jun 6, 2025
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78 changes: 69 additions & 9 deletions packages/ai-chat/src/browser/change-set-file-element.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -76,7 +76,9 @@ export class ChangeSetFileElement implements ChangeSetElement {
protected readonly toDispose = new DisposableCollection();
protected _state: ChangeSetElementState;

protected originalContent: string | undefined;
private _originalContent: string | undefined;
protected _initialized = false;
protected _initializationPromise: Promise<void> | undefined;

protected readonly onDidChangeEmitter = new Emitter<void>();
readonly onDidChange = this.onDidChangeEmitter.event;
Expand All @@ -85,12 +87,36 @@ export class ChangeSetFileElement implements ChangeSetElement {

@postConstruct()
init(): void {
this._initializationPromise = this.initializeAsync();
this.toDispose.push(this.onDidChangeEmitter);
}

protected async initializeAsync(): Promise<void> {
await this.obtainOriginalContent();
this.listenForOriginalFileChanges();
this._initialized = true;
}

/**
* Ensures that the element is fully initialized before proceeding.
* This includes loading the original content from the file system.
*/
async ensureInitialized(): Promise<void> {
await this._initializationPromise;
}

/**
* Returns true if the element has been fully initialized.
*/
get isInitialized(): boolean {
return this._initialized;
}

protected async obtainOriginalContent(): Promise<void> {
this.originalContent = await this.changeSetFileService.read(this.uri);
this.readOnlyResource.update({ contents: this.originalContent ?? '' });
this._originalContent = await this.changeSetFileService.read(this.uri);
if (this._readOnlyResource) {
this.readOnlyResource.update({ contents: this._originalContent ?? '' });
}
}

protected getInMemoryUri(uri: URI): ConfigurableMutableReferenceResource {
Expand All @@ -100,10 +126,14 @@ export class ChangeSetFileElement implements ChangeSetElement {
protected listenForOriginalFileChanges(): void {
this.toDispose.push(this.fileService.onDidFilesChange(async event => {
if (!event.contains(this.uri)) { return; }
if (!this._initialized && this._initializationPromise) {
// make sure we are initialized
await this._initializationPromise;
}
// If we are applied, the tricky thing becomes the question what to revert to; otherwise, what to apply.
const newContent = await this.changeSetFileService.read(this.uri).catch(() => '');
this.readOnlyResource.update({ contents: newContent });
if (newContent === this.originalContent) {
if (newContent === this._originalContent) {
this.state = 'pending';
} else if (newContent === this.targetState) {
this.state = 'applied';
Expand All @@ -120,10 +150,19 @@ export class ChangeSetFileElement implements ChangeSetElement {
protected get readOnlyResource(): ConfigurableMutableReferenceResource {
if (!this._readOnlyResource) {
this._readOnlyResource = this.getInMemoryUri(ChangeSetFileElement.toReadOnlyUri(this.uri, this.elementProps.chatSessionId));
this._readOnlyResource.update({ autosaveable: false, readOnly: true });
this._readOnlyResource.update({
autosaveable: false,
readOnly: true,
contents: this._originalContent ?? ''
});
this.toDispose.push(this._readOnlyResource);
this.obtainOriginalContent();
this.listenForOriginalFileChanges();

// If not yet initialized, update the resource once initialization completes
if (!this._initialized) {
this._initializationPromise?.then(() => {
this._readOnlyResource?.update({ contents: this._originalContent ?? '' });
});
}
}
return this._readOnlyResource;
}
Expand Down Expand Up @@ -180,22 +219,41 @@ export class ChangeSetFileElement implements ChangeSetElement {
return this.elementProps.data;
};

get originalContent(): string | undefined {
if (!this._initialized && this._initializationPromise) {
console.warn('Accessing originalContent before initialization is complete. Consider using async methods.');
}
return this._originalContent;
}

/**
* Gets the original content of the file asynchronously.
* Ensures initialization is complete before returning the content.
*/
async getOriginalContent(): Promise<string | undefined> {
await this.ensureInitialized();
return this._originalContent;
}

get targetState(): string {
return this.elementProps.targetState ?? '';
}

async open(): Promise<void> {
await this.ensureInitialized();
this.changeSetFileService.open(this);
}

async openChange(): Promise<void> {
await this.ensureInitialized();
this.changeSetFileService.openDiff(
this.readOnlyUri,
this.changedUri
);
}

async apply(contents?: string): Promise<void> {
await this.ensureInitialized();
if (!await this.confirm('Apply')) { return; }
if (!(await this.changeSetFileService.trySave(this.changedUri))) {
if (this.type === 'delete') {
Expand All @@ -214,16 +272,18 @@ export class ChangeSetFileElement implements ChangeSetElement {
}

onShow(): void {
// Ensure we have the latest state when showing
this.changeResource.update({ contents: this.targetState, onSave: content => this.writeChanges(content) });
}

async revert(): Promise<void> {
await this.ensureInitialized();
if (!await this.confirm('Revert')) { return; }
this.state = 'pending';
if (this.type === 'add') {
await this.changeSetFileService.delete(this.uri);
} else if (this.originalContent) {
await this.changeSetFileService.write(this.uri, this.originalContent);
} else if (this._originalContent) {
await this.changeSetFileService.write(this.uri, this._originalContent);
}
}

Expand Down
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