src/api.ts

@@ -48,8 +48,8 @@ export const api = {
   conversationDetail: (id: string) => auth.fetch(`${BASE}/api/conversations/${id}`).then(r =>
     json<{ conversation: Conversation; messages: Message[]; runs: Run[]; activeHitl: HITLCard[]; lastSeq: number }>(r)),
 
-  sendMessage: (convId: string, text: string, attachmentIds: string[]) =>
-    auth.fetch(`${BASE}/api/conversations/${convId}/messages`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ text, attachmentIds }) })
+  sendMessage: (convId: string, text: string, attachmentIds: string[], requestId?: string) =>
+    auth.fetch(`${BASE}/api/conversations/${convId}/messages`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ text, attachmentIds, requestId }) })
       .then(async r => {
         if (!r.ok) throw new Error(`${r.status}: ${await r.text()}`)
         return r.json() as Promise<{ message: Message; run?: Run; command?: string; reply?: string; conversation?: Conversation }>

src/outbox.ts

@@ -31,6 +31,12 @@ export function replaceQueuedText(queue: QueuedMessage[], id: string, text: stri
   return queue.map(q => q.id === id ? { ...q, text } : q)
 }
 
+// deliveryRequestId 是这条排队消息重发时必须复用的 requestId。
+// 服务端按它去重，避免忙时 409 再入队后写出第二条用户消息。
+export function deliveryRequestId(item: QueuedMessage): string {
+  return item.id
+}
+
 export function promoteQueuedMessage(queue: QueuedMessage[], id: string): QueuedMessage[] {
   const item = queue.find(q => q.id === id)
   if (!item) return queue

src/store.ts

@@ -4,7 +4,7 @@ import { useSyncExternalStore } from 'react'
 import { api, connectEvents } from './api'
 import { applyTextDelta, applyThinkingDelta, applyToolCall, applyToolCallDelta, applyToolResult, applyToolOutput, applyArtifactCreated, applyArtifactUpdated, applyCheck, applyFinalizing, type LiveItem } from './live'
 import { closePreviewTab, openPreviewTab, type PreviewTab } from './previewtabs'
-import { enqueueMessage, enqueueMessageFront, newQueuedMessage, promoteQueuedMessage, removeQueuedMessage, replaceQueuedText, type QueuedMessage } from './outbox'
+import { deliveryRequestId, enqueueMessage, enqueueMessageFront, newQueuedMessage, promoteQueuedMessage, removeQueuedMessage, replaceQueuedText, type QueuedMessage } from './outbox'
 import { flashElement } from './scrollsync'
 import { isThemeChoice, resolveTheme, type ThemeChoice } from './theme'
 import type {
@@ -468,10 +468,11 @@ export const store = {
     }
   },
 
-  async sendMessage(text: string, attachmentIds: string[]): Promise<'ok' | 'busy'> {
+  async sendMessage(text: string, attachmentIds: string[], requestId?: string): Promise<'ok' | 'busy'> {
     if (!state.currentConvId) return 'ok'
+    const id = requestId ?? newQueuedMessage(text, attachmentIds, []).id
     try {
-      const out = await api.sendMessage(state.currentConvId, text, attachmentIds)
+      const out = await api.sendMessage(state.currentConvId, text, attachmentIds, id)
       if (out.command) {
         store.toast(out.reply ?? `命令 ${out.command} 已执行`)
         if (out.conversation) await store.openConversation(out.conversation.id)
@@ -491,7 +492,7 @@ export const store = {
       return 'ok'
     } catch (e) {
       if (isConversationBusy(e)) {
-        set({ outbox: enqueueMessageFront(state.outbox, newQueuedMessage(text, attachmentIds, [])) })
+        set({ outbox: enqueueMessageFront(state.outbox, { id, text, attachmentIds, attachmentNames: [] }) })
         return 'busy'
       }
       store.toast(`发送失败：${e}`)
@@ -522,7 +523,7 @@ export const store = {
       return
     }
     set({ outbox: rest })
-    await store.sendMessage(item.text, item.attachmentIds)
+    await store.sendMessage(item.text, item.attachmentIds, deliveryRequestId(item))
   },
 
   async flushOutbox() {
@@ -533,7 +534,7 @@ export const store = {
     set({ outbox: state.outbox.slice(1), outboxDraining: true })
     let result: 'ok' | 'busy' = 'ok'
     try {
-      result = await store.sendMessage(next.text, next.attachmentIds)
+      result = await store.sendMessage(next.text, next.attachmentIds, deliveryRequestId(next))
     } finally {
       set({ outboxDraining: false })
     }

test/outbox.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from 'vitest'
 import {
-  enqueueMessage, enqueueMessageFront, newQueuedMessage, promoteQueuedMessage,
+  deliveryRequestId, enqueueMessage, enqueueMessageFront, newQueuedMessage, promoteQueuedMessage,
   removeQueuedMessage, replaceQueuedText,
 } from '../src/outbox'
 
@@ -25,4 +25,13 @@ describe('outbox', () => {
     const again = enqueueMessageFront(q, b)
     expect(again.map(x => x.id)).toEqual([b.id, a.id])
   })
+
+  it('reuses the queued id as the request id when the send is retried', () => {
+    const item = newQueuedMessage('hi', ['f1'], ['note.md'])
+    const queued = enqueueMessageFront([], item)
+    expect(deliveryRequestId(queued[0])).toBe(item.id)
+    const retried = enqueueMessageFront(queued, { ...item, text: item.text })
+    expect(deliveryRequestId(retried[0])).toBe(item.id)
+    expect(retried).toHaveLength(1)
+  })
 })