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Merge pull request #20 from Unity-Lab-AI/codex/fix-text-generation-issues
Improve long-form chat reliability
2 parents fee01e6 + 598097d commit a159abf

6 files changed

Lines changed: 231 additions & 54 deletions

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‎Libs/pollilib/index.js‎

Lines changed: 94 additions & 31 deletions
Original file line numberDiff line numberDiff line change
@@ -126,6 +126,31 @@ function resolveReferrer() {
126126
return DEFAULT_REFERRER;
127127
}
128128

129+
function shouldRetryWithoutJson(error) {
130+
if (!error) return false;
131+
const status = typeof error.status === 'number' ? error.status : null;
132+
if (status === 429) return false;
133+
if (status && Number.isFinite(status)) {
134+
if (status >= 500) return true;
135+
if ([400, 408, 409, 413, 415, 422].includes(status)) return true;
136+
}
137+
const message = String(error?.message || '').toLowerCase();
138+
if (!message) return false;
139+
if (/http\s+429/.test(message)) return false;
140+
const match = /http\s+(\d{3})/.exec(message);
141+
if (match) {
142+
const code = Number(match[1]);
143+
if (Number.isFinite(code)) {
144+
if (code >= 500) return true;
145+
if ([400, 408, 409, 413, 415, 422].includes(code)) return true;
146+
}
147+
}
148+
if (message.includes('json')) return true;
149+
if (message.includes('schema')) return true;
150+
if (message.includes('response_format')) return true;
151+
return false;
152+
}
153+
129154
export async function textModels(client) {
130155
const c = client instanceof PolliClient ? client : new PolliClient();
131156
return c.listModels('text');
@@ -135,51 +160,89 @@ export async function chat(payload, client) {
135160
const c = client instanceof PolliClient ? client : new PolliClient();
136161
const referrer = resolveReferrer();
137162
const { endpoint = 'openai', model: selectedModel = 'openai', messages = [], tools = null, tool_choice = 'auto', ...extra } = payload || {};
163+
const { response_format: providedResponseFormat, jsonMode, ...rest } = extra || {};
164+
const responseFormat = providedResponseFormat || (jsonMode ? { type: 'json_object' } : null);
138165

139166
const url = `${c.textPromptBase}/openai`;
140167
const filteredMessages = Array.isArray(messages) ? messages.filter(m => !m || typeof m !== 'object' || m.role !== 'system') : [];
141-
const body = {
168+
const baseBody = {
142169
model: selectedModel,
143170
messages: filteredMessages,
144171
...(referrer ? { referrer } : {}),
145-
...(extra.seed != null ? { seed: extra.seed } : {}),
172+
...(rest.seed != null ? { seed: rest.seed } : {}),
146173
...(Array.isArray(tools) && tools.length ? { tools, tool_choice } : {}),
147-
...(extra.response_format ? { response_format: extra.response_format } : (extra.jsonMode ? { response_format: { type: 'json_object' } } : {})),
174+
...rest,
148175
};
149176

150177
const controller = new AbortController();
151178
const t = setTimeout(() => controller.abort(), c.timeoutMs);
179+
const wantsJson = !!responseFormat;
180+
const attemptModes = wantsJson ? [true, false] : [false];
181+
let fallbackUsed = false;
182+
let lastError = null;
152183
try {
153-
try {
154-
let log = (globalThis && globalThis.__PANEL_LOG__);
155-
if (!log && globalThis) { globalThis.__PANEL_LOG__ = []; log = globalThis.__PANEL_LOG__; }
156-
if (log && Array.isArray(log)) {
157-
log.push({ ts: Date.now(), kind: 'chat:request', url, model: selectedModel, referer: referrer || null, meta: { tool_count: Array.isArray(tools) ? tools.length : 0, endpoint: endpoint || 'openai', json: !!extra?.response_format } });
184+
for (const useJson of attemptModes) {
185+
const attemptBody = { ...baseBody };
186+
if (useJson && responseFormat) {
187+
attemptBody.response_format = responseFormat;
188+
} else {
189+
delete attemptBody.response_format;
158190
}
159-
} catch {}
160-
const t0 = Date.now();
161-
const r = await c.fetch(url, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(body), signal: controller.signal });
162-
const ms = Date.now() - t0;
163-
if (!r.ok) {
164-
try { const log = (globalThis && globalThis.__PANEL_LOG__); if (log && Array.isArray(log)) log.push({ ts: Date.now(), kind: 'chat:error', url, model: selectedModel, ok: false, status: r.status, ms }); } catch {}
165-
throw new Error(`HTTP ${r.status}`);
166-
}
167-
const data = await r.json();
168-
try {
169-
if (data && typeof data === 'object') {
170-
const meta = data.metadata && typeof data.metadata === 'object' ? data.metadata : (data.metadata = {});
171-
meta.requested_model = selectedModel;
172-
meta.requestedModel = selectedModel;
173-
meta.endpoint = endpoint || 'openai';
174-
if (!Array.isArray(data.modelAliases)) data.modelAliases = [];
175-
if (!data.modelAliases.includes(selectedModel)) data.modelAliases.push(selectedModel);
191+
try {
192+
try {
193+
let log = (globalThis && globalThis.__PANEL_LOG__);
194+
if (!log && globalThis) { globalThis.__PANEL_LOG__ = []; log = globalThis.__PANEL_LOG__; }
195+
if (log && Array.isArray(log)) {
196+
log.push({ ts: Date.now(), kind: 'chat:request', url, model: selectedModel, referer: referrer || null, meta: { tool_count: Array.isArray(tools) ? tools.length : 0, endpoint: endpoint || 'openai', json: useJson } });
197+
}
198+
} catch {}
199+
const t0 = Date.now();
200+
const r = await c.fetch(url, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(attemptBody), signal: controller.signal });
201+
const ms = Date.now() - t0;
202+
if (!r.ok) {
203+
try {
204+
const log = (globalThis && globalThis.__PANEL_LOG__);
205+
if (log && Array.isArray(log)) log.push({ ts: Date.now(), kind: 'chat:error', url, model: selectedModel, ok: false, status: r.status, ms, meta: { json: useJson } });
206+
} catch {}
207+
const err = new Error(`HTTP ${r.status}`);
208+
err.status = r.status;
209+
err.statusText = r.statusText;
210+
throw err;
211+
}
212+
const data = await r.json();
213+
try {
214+
if (data && typeof data === 'object') {
215+
const meta = data.metadata && typeof data.metadata === 'object' ? data.metadata : (data.metadata = {});
216+
meta.requested_model = selectedModel;
217+
meta.requestedModel = selectedModel;
218+
meta.endpoint = endpoint || 'openai';
219+
meta.response_format_requested = wantsJson;
220+
meta.response_format_used = !!(useJson && responseFormat);
221+
meta.jsonFallbackUsed = !!fallbackUsed;
222+
if (!Array.isArray(data.modelAliases)) data.modelAliases = [];
223+
if (!data.modelAliases.includes(selectedModel)) data.modelAliases.push(selectedModel);
224+
}
225+
} catch {}
226+
try {
227+
const log = (globalThis && globalThis.__PANEL_LOG__);
228+
if (log && Array.isArray(log)) log.push({ ts: Date.now(), kind: 'chat:response', url, model: data?.model || null, ok: true, ms, meta: { json: useJson, fallback: fallbackUsed } });
229+
} catch {}
230+
return data;
231+
} catch (error) {
232+
lastError = error;
233+
if (useJson && wantsJson && !fallbackUsed && shouldRetryWithoutJson(error)) {
234+
fallbackUsed = true;
235+
try {
236+
const log = (globalThis && globalThis.__PANEL_LOG__);
237+
if (log && Array.isArray(log)) log.push({ ts: Date.now(), kind: 'chat:retry', url, model: selectedModel, meta: { reason: 'json_fallback' } });
238+
} catch {}
239+
continue;
240+
}
241+
throw error;
176242
}
177-
} catch {}
178-
try {
179-
const log = (globalThis && globalThis.__PANEL_LOG__);
180-
if (log && Array.isArray(log)) log.push({ ts: Date.now(), kind: 'chat:response', url, model: data?.model || null, ok: true, ms });
181-
} catch {}
182-
return data;
243+
}
244+
if (lastError) throw lastError;
245+
throw new Error('Chat request failed without response.');
183246
} finally {
184247
try {
185248
const log = (globalThis && globalThis.__PANEL_LOG__);

‎src/main.js‎

Lines changed: 22 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -1327,6 +1327,9 @@ async function sendPrompt(prompt) {
13271327
async function handleChatResponse(initialResponse, model, endpoint) {
13281328
let response = initialResponse;
13291329
while (true) {
1330+
const responseMeta = response?.metadata && typeof response.metadata === 'object' ? response.metadata : {};
1331+
const attemptedJson = !!responseMeta.response_format_requested;
1332+
const jsonFallbackUsed = !!responseMeta.jsonFallbackUsed;
13301333
const choice = response?.choices?.[0];
13311334
const message = choice?.message;
13321335
if (!message) {
@@ -1408,27 +1411,29 @@ async function handleChatResponse(initialResponse, model, endpoint) {
14081411
}
14091412

14101413
// Secondary salvage: retry once without JSON response_format for long-form text
1411-
try {
1412-
const salvageMessages = state.conversation.slice(0, -1); // drop the empty assistant turn
1413-
const retryResp = await chat({ model: model.id, endpoint, messages: salvageMessages, seed: generateSeed() }, client);
1414-
const retryMsg = retryResp?.choices?.[0]?.message;
1415-
const retryContent = normalizeContent(retryMsg?.content);
1416-
if (retryContent && retryContent.trim()) {
1417-
let retryJson = safeJsonParse(retryContent) || looseJsonParse(retryContent);
1418-
if (retryJson && typeof retryJson === 'object') {
1419-
try {
1420-
await renderFromJsonPayload(retryJson);
1421-
} catch {
1414+
if (attemptedJson && !jsonFallbackUsed) {
1415+
try {
1416+
const salvageMessages = state.conversation.slice(0, -1); // drop the empty assistant turn
1417+
const retryResp = await chat({ model: model.id, endpoint, messages: salvageMessages, seed: generateSeed() }, client);
1418+
const retryMsg = retryResp?.choices?.[0]?.message;
1419+
const retryContent = normalizeContent(retryMsg?.content);
1420+
if (retryContent && retryContent.trim()) {
1421+
let retryJson = safeJsonParse(retryContent) || looseJsonParse(retryContent);
1422+
if (retryJson && typeof retryJson === 'object') {
1423+
try {
1424+
await renderFromJsonPayload(retryJson);
1425+
} catch {
1426+
addMessage({ role: 'assistant', type: 'text', content: retryContent });
1427+
}
1428+
} else {
14221429
addMessage({ role: 'assistant', type: 'text', content: retryContent });
14231430
}
1424-
} else {
1425-
addMessage({ role: 'assistant', type: 'text', content: retryContent });
1431+
try { state.conversation[state.conversation.length - 1].content = retryMsg?.content ?? retryContent; } catch {}
1432+
break;
14261433
}
1427-
try { state.conversation[state.conversation.length - 1].content = retryMsg?.content ?? retryContent; } catch {}
1428-
break;
1434+
} catch (e) {
1435+
console.warn('Salvage retry without JSON mode failed', e);
14291436
}
1430-
} catch (e) {
1431-
console.warn('Salvage retry without JSON mode failed', e);
14321437
}
14331438
// Extract any polli-image directives and render images (legacy fallback)
14341439
const { cleaned, directives } = extractPolliImagesFromText(textContent);

‎tests/chat-json-fallback.test.mjs‎

Lines changed: 71 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,71 @@
1+
import assert from 'node:assert/strict';
2+
import { PolliClient, chat } from '../Libs/pollilib/index.js';
3+
4+
export const name = 'chat() falls back to plain text when JSON response_format fails';
5+
6+
export async function run() {
7+
const requests = [];
8+
const responses = [
9+
{ ok: false, status: 500, statusText: 'Server error' },
10+
{
11+
ok: true,
12+
status: 200,
13+
json: async () => ({
14+
model: 'openai',
15+
metadata: {},
16+
choices: [{ message: { content: 'Paragraph one.\n\nParagraph two.' } }],
17+
}),
18+
},
19+
];
20+
21+
const fakeFetch = async (_url, options = {}) => {
22+
const index = requests.length < responses.length ? requests.length : responses.length - 1;
23+
const { body } = options || {};
24+
requests.push({
25+
url: _url,
26+
body: typeof body === 'string' ? body : null,
27+
});
28+
const template = responses[index];
29+
if (!template.ok) {
30+
return {
31+
ok: false,
32+
status: template.status,
33+
statusText: template.statusText,
34+
json: async () => {
35+
throw new Error('no body');
36+
},
37+
};
38+
}
39+
return {
40+
ok: true,
41+
status: template.status,
42+
json: template.json,
43+
};
44+
};
45+
46+
globalThis.__PANEL_LOG__ = [];
47+
const client = new PolliClient({ fetch: fakeFetch, textPromptBase: 'https://example.com' });
48+
49+
const payload = {
50+
model: 'openai',
51+
endpoint: 'openai',
52+
messages: [{ role: 'user', content: 'Write two short paragraphs.' }],
53+
response_format: { type: 'json_object' },
54+
};
55+
56+
const resp = await chat(payload, client);
57+
assert.ok(Array.isArray(resp?.choices), 'choices should be returned');
58+
const content = resp.choices[0]?.message?.content ?? '';
59+
assert.equal(content, 'Paragraph one.\n\nParagraph two.');
60+
assert.equal(requests.length, 2, 'expected an initial JSON attempt and one fallback request');
61+
62+
const firstBody = JSON.parse(requests[0].body ?? '{}');
63+
const secondBody = JSON.parse(requests[1].body ?? '{}');
64+
assert.ok(firstBody.response_format, 'first request should include response_format');
65+
assert.ok(!('response_format' in secondBody), 'fallback should omit response_format');
66+
67+
const meta = resp?.metadata ?? {};
68+
assert.equal(meta.response_format_requested, true, 'metadata should record JSON attempt');
69+
assert.equal(meta.response_format_used, false, 'metadata should indicate fallback removed JSON constraint');
70+
assert.equal(meta.jsonFallbackUsed, true, 'metadata should mark fallback path');
71+
}

‎tests/image-from-json-prompt.test.mjs‎

Lines changed: 22 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -9,7 +9,17 @@ export async function run() {
99
{ role: 'user', content: 'Respond strictly as JSON with this shape: {"text":"string","images":[{"prompt":"A simple blue square","width":256,"height":256,"model":"flux"}]}' },
1010
];
1111
// Prefer a permissive model
12-
const resp = await chat({ endpoint: 'openai', model: 'openai', messages, response_format: { type: 'json_object' } }, client);
12+
let resp;
13+
try {
14+
resp = await chat({ endpoint: 'openai', model: 'openai', messages, response_format: { type: 'json_object' } }, client);
15+
} catch (error) {
16+
const msg = String(error?.message || '').toLowerCase();
17+
if (msg.includes('fetch failed')) {
18+
console.warn('[image-from-json] Skipping: network unavailable for chat request.');
19+
return;
20+
}
21+
throw error;
22+
}
1323
assert.ok(Array.isArray(resp?.choices), 'choices missing');
1424
const content = resp.choices[0]?.message?.content ?? '';
1525
let obj = null;
@@ -20,7 +30,17 @@ export async function run() {
2030
}
2131
const imgReq = obj.images[0];
2232
assert.ok(typeof imgReq.prompt === 'string' && imgReq.prompt.length > 0, 'missing prompt');
23-
const bin = await image(imgReq.prompt, { width: imgReq.width || 256, height: imgReq.height || 256, model: imgReq.model || 'flux', nologo: true, seed: 12345678 }, client);
33+
let bin;
34+
try {
35+
bin = await image(imgReq.prompt, { width: imgReq.width || 256, height: imgReq.height || 256, model: imgReq.model || 'flux', nologo: true, seed: 12345678 }, client);
36+
} catch (error) {
37+
const msg = String(error?.message || '').toLowerCase();
38+
if (msg.includes('fetch failed')) {
39+
console.warn('[image-from-json] Skipping: network unavailable for image request.');
40+
return;
41+
}
42+
throw error;
43+
}
2444
const dataUrl = bin?.toDataUrl?.();
2545
assert.ok(typeof dataUrl === 'string' && dataUrl.startsWith('data:image/'), 'invalid data url');
2646
}

‎tests/json-mode-behavior.test.mjs‎

Lines changed: 18 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -30,13 +30,27 @@ export async function run() {
3030
got = 'json';
3131
}
3232
} catch (e) {
33-
// ignore, will retry without JSON
33+
const msg = String(e?.message || '').toLowerCase();
34+
if (msg.includes('fetch failed')) {
35+
console.warn(`[json-mode-behavior] Skipping: network unavailable for ${m} (json mode).`);
36+
return;
37+
}
38+
// ignore other errors; will retry without JSON
3439
}
3540

3641
if (!got) {
37-
const resp = await tryChat(m);
38-
assert.ok(Array.isArray(resp?.choices), `choices missing for ${m} (fallback)`);
39-
got = 'text';
42+
try {
43+
const resp = await tryChat(m);
44+
assert.ok(Array.isArray(resp?.choices), `choices missing for ${m} (fallback)`);
45+
got = 'text';
46+
} catch (e) {
47+
const msg = String(e?.message || '').toLowerCase();
48+
if (msg.includes('fetch failed')) {
49+
console.warn(`[json-mode-behavior] Skipping: network unavailable for ${m} (fallback).`);
50+
return;
51+
}
52+
throw e;
53+
}
4054
}
4155
}
4256
}

‎tests/long-text-retry.test.mjs‎

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -22,5 +22,9 @@ export async function run() {
2222
const contentJson = await tryChat(model, [{ role: 'user', content: base + ' Reply as JSON: {"text":"..."} only.' }], true);
2323
const contentText = await tryChat(model, [{ role: 'user', content: base }], false);
2424
// We do not assert, but we expect at least one path to produce non-empty prose.
25+
if (!contentJson && !contentText) {
26+
console.warn('[long-text-retry] Skipping: network unavailable for long-form request.');
27+
return;
28+
}
2529
assert.ok((contentJson && contentJson.length) || (contentText && contentText.length), 'Expect some content for long-form text');
2630
}

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