feat(session-title): add fallback and model providers

2026-07-21 01:53:24 +08:00
parent 9a6914d845
commit 58dc5f94de
41 changed files with 2900 additions and 1 deletions
@@ -0,0 +1,86 @@
+import { Context } from 'cordis'
+import { describe, expect, it, vi } from 'vitest'
+import LlmService, { LlmAdapter } from '@deepseek-ai/dsh-llm'
+import type { GenerateOptions, StreamChunk } from '@deepseek-ai/dsh-llm'
+import SessionStore, { Session, SessionId } from '@deepseek-ai/dsh-session'
+import SessionTitleService, { type SessionTitleProvider } from '@deepseek-ai/dsh-session-title'
+import * as providerPlugin from '@deepseek-ai/dsh-session-title-first-message-llm'
+
+class RecordingAdapter extends LlmAdapter {
+  readonly requests: GenerateOptions[] = []
+
+  override async * stream(options: GenerateOptions): AsyncIterable<StreamChunk> {
+    this.requests.push(options)
+    yield { type: 'text-delta', index: 0, text: 'First-message model title' }
+    yield { type: 'finish', reason: { kind: 'stop' } }
+  }
+}
+
+const TITLE_CONFIG = { fallbackMaxWords: 5, fallbackMaxBytes: 40, maxTitleBytes: 80 } as const
+const LLM_CONFIG = {
+  targetWords: 5,
+  targetCjkCharacters: 10,
+  maxInputBytes: 1_000,
+  maxOutputTokens: 32,
+  timeoutMs: 1_000,
+  provider: 'title-route',
+  model: 'title-model',
+} as const
+
+async function settle(): Promise<void> {
+  await new Promise(resolve => setTimeout(resolve, 0))
+}
+
+describe('first-message LLM title provider', () => {
+  it('rejects an impossible empty provider request at its own boundary', async () => {
+    const ctx = new Context()
+    await ctx.plugin(LlmService)
+    await ctx.plugin(SessionStore)
+    await ctx.plugin(SessionTitleService, TITLE_CONFIG)
+    let registered: SessionTitleProvider | undefined
+    vi.spyOn(ctx.sessionTitle, 'register').mockImplementation((provider) => {
+      registered = provider
+      return () => undefined
+    })
+    providerPlugin.apply(ctx, LLM_CONFIG)
+
+    await expect(registered!.generate({
+      session: new Session(SessionId('empty-first-provider')),
+      messages: [],
+      signal: new AbortController().signal,
+    })).rejects.toThrow(/requires one human message/)
+  })
+
+  it('always selects only the first eligible human message, including explicit refresh', async () => {
+    const ctx = new Context()
+    await ctx.plugin(LlmService)
+    await ctx.plugin(SessionStore)
+    await ctx.plugin(SessionTitleService, TITLE_CONFIG)
+    const adapter = new RecordingAdapter()
+    ctx.llm.registerAdapter(['title-route'], adapter)
+    await ctx.plugin(providerPlugin, LLM_CONFIG)
+    const session = ctx.sessions.create(SessionId('first-plugin'))
+    session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
+    const first = session.append('user/message', {
+      content: [{ type: 'text', text: 'first input' }], source: { kind: 'user' },
+    }, { surfaceOp: 'append' })
+    await settle()
+    session.append('request/header', {
+      header: { config: { provider: 'main', model: 'main-model' } }, reason: 'initial',
+    })
+    await settle()
+    session.append('user/message', {
+      content: [{ type: 'text', text: 'second input must be ignored' }], source: { kind: 'user' },
+    }, { surfaceOp: 'append' })
+
+    await ctx.sessionTitle.refresh(session)
+
+    expect(adapter.requests).toHaveLength(2)
+    for (const options of adapter.requests) {
+      const content = options.messages[0]?.content[0]
+      expect(content?.type === 'text' && content.text).toContain('first input')
+      expect(content?.type === 'text' && content.text).not.toContain('second input must be ignored')
+    }
+    expect(ctx.sessionTitle.get(session)).toMatchObject({ messageSeqs: [first.seq] })
+  })
+})