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Feat: Support streaming image generation deltas

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multipleof4
2025-11-15 18:24:36 -08:00
parent fd2e44d324
commit 251f4b4e19
1 changed files with 25 additions and 8 deletions
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33
index.js
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@@ -67,6 +67,7 @@ export class MyDurableObject {
this.controller = null;
this.oaStream = null;
this.pending = '';
this.pendingImages = [];
this.flushTimer = null;
this.lastSavedAt = 0;
this.lastFlushedAt = 0;
@@ -85,7 +86,7 @@ export class MyDurableObject {
getConversationText() {
const prompt = (this.messages || []).map(m => `## ${m.role}\n\n${this.extractTextFromMessage(m)}`).join('\n\n---\n\n');
const response = this.buffer.map(it => it.text).join('');
const response = this.buffer.map(it => it.text || '').join('');
if (!prompt && !response) return '';
return `${prompt}\n\n---\n\n## assistant\n\n${response}`;
}
@@ -125,6 +126,7 @@ export class MyDurableObject {
this.error = snap.error || null;
this.messages = Array.isArray(snap.messages) ? snap.messages : [];
this.pending = '';
this.pendingImages = [];
if (this.phase === 'running') {
this.phase = 'evicted';
@@ -142,17 +144,21 @@ export class MyDurableObject {
}
replay(ws, after) {
this.buffer.forEach(it => { if (it.seq > after) this.send(ws, { type: 'delta', seq: it.seq, text: it.text }); });
this.buffer.forEach(it => { if (it.seq > after) this.send(ws, { type: 'delta', seq: it.seq, text: it.text, images: it.images }); });
if (this.phase === 'done') this.send(ws, { type: 'done' });
else if (['error', 'evicted'].includes(this.phase)) this.send(ws, { type: 'err', message: this.error || 'The run was terminated unexpectedly.' });
}
flush(force = false) {
if (this.flushTimer) { clearTimeout(this.flushTimer); this.flushTimer = null; }
if (this.pending) {
this.buffer.push({ seq: ++this.seq, text: this.pending });
this.bcast({ type: 'delta', seq: this.seq, text: this.pending });
if (this.pending || this.pendingImages.length > 0) {
const payload = { type: 'delta', seq: ++this.seq };
if (this.pending) payload.text = this.pending;
if (this.pendingImages.length > 0) payload.images = this.pendingImages;
this.buffer.push(payload);
this.bcast(payload);
this.pending = '';
this.pendingImages = [];
this.lastFlushedAt = Date.now();
}
if (force) this.saveSnapshot();
@@ -165,6 +171,12 @@ export class MyDurableObject {
else if (!this.flushTimer) this.flushTimer = setTimeout(() => this.flush(false), BATCH_MS);
}
queueImages(images) {
if (!Array.isArray(images) || images.length === 0) return;
this.pendingImages.push(...images);
if (!this.flushTimer) this.flushTimer = setTimeout(() => this.flush(false), BATCH_MS);
}
async fetch(req) {
if (req.method === 'OPTIONS') return new Response(null, { status: 204, headers: CORS_HEADERS });
@@ -179,10 +191,12 @@ export class MyDurableObject {
if (req.method === 'GET') {
await this.autopsy();
const text = this.buffer.map(it => it.text).join('') + this.pending;
const text = this.buffer.map(it => it.text || '').join('') + this.pending;
const images = this.buffer.flatMap(it => it.images || []);
if (this.pendingImages.length > 0) images.push(...this.pendingImages);
const isTerminal = ['done', 'error', 'evicted'].includes(this.phase);
const isError = ['error', 'evicted'].includes(this.phase);
const payload = { rid: this.rid, seq: this.seq, phase: this.phase, done: isTerminal, error: isError ? (this.error || 'The run was terminated unexpectedly.') : null, text };
const payload = { rid: this.rid, seq: this.seq, phase: this.phase, done: isTerminal, error: isError ? (this.error || 'The run was terminated unexpectedly.') : null, text, images };
return this.corsJSON(payload);
}
return this.corsJSON({ error: 'not allowed' }, 405);
@@ -342,6 +356,9 @@ export class MyDurableObject {
this.queueDelta(delta.content);
hasContent = true;
}
if (delta?.images) {
this.queueImages(delta.images);
}
}
}
@@ -407,7 +424,7 @@ export class MyDurableObject {
mapContentPartToResponses(part) {
const type = part?.type || 'text';
if (['image_url', 'input_image'].includes(type)) return (part?.image_url?.url || part?.image_url) ? { type: 'input_image', image_url: String(part?.image_url?.url || part?.image_url) } : null;
if (['text', 'input_text'].includes(type)) return { type: 'input_text', text: String(type === 'text' ? (part.text ?? part.content ?? '') : (part.text ?? '')) };
if (['text', 'input_text'].includes(type)) return { type: 'input_text', text: String(type === 'text' ? (p.text ?? p.content ?? '') : (p.text ?? '')) };
return { type: 'input_text', text: `[${type}:${part?.file?.filename || 'file'}]` };
}