502 lines
13 KiB
TypeScript
502 lines
13 KiB
TypeScript
import path from "path"
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import { App } from "../app/app"
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import { Identifier } from "../id/id"
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import { LLM } from "../llm/llm"
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import { Storage } from "../storage/storage"
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import { Log } from "../util/log"
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import {
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convertToModelMessages,
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generateText,
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stepCountIs,
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streamText,
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type LanguageModelUsage,
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} from "ai"
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import { z } from "zod"
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import * as tools from "../tool"
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import { Decimal } from "decimal.js"
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import PROMPT_ANTHROPIC from "./prompt/anthropic.txt"
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import PROMPT_TITLE from "./prompt/title.txt"
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import PROMPT_SUMMARIZE from "./prompt/summarize.txt"
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import { Share } from "../share/share"
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import { Message } from "./message"
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import { Bus } from "../bus"
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import type { Provider } from "../provider/provider"
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export namespace Session {
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const log = Log.create({ service: "session" })
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export const Info = z
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.object({
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id: Identifier.schema("session"),
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share: z
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.object({
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secret: z.string(),
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url: z.string(),
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})
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.optional(),
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title: z.string(),
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time: z.object({
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created: z.number(),
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updated: z.number(),
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}),
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})
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.openapi({
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ref: "session.info",
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})
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export type Info = z.output<typeof Info>
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export const Event = {
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Updated: Bus.event(
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"session.updated",
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z.object({
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info: Info,
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}),
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),
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}
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const state = App.state("session", () => {
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const sessions = new Map<string, Info>()
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const messages = new Map<string, Message.Info[]>()
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return {
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sessions,
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messages,
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}
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})
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export async function create() {
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const result: Info = {
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id: Identifier.descending("session"),
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title: "New Session - " + new Date().toISOString(),
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time: {
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created: Date.now(),
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updated: Date.now(),
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},
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}
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log.info("created", result)
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state().sessions.set(result.id, result)
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await Storage.writeJSON("session/info/" + result.id, result)
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share(result.id).then((share) => {
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update(result.id, (draft) => {
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draft.share = share
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})
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})
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Bus.publish(Event.Updated, {
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info: result,
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})
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return result
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}
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export async function get(id: string) {
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const result = state().sessions.get(id)
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if (result) {
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return result
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}
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const read = await Storage.readJSON<Info>("session/info/" + id)
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state().sessions.set(id, read)
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return read as Info
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}
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export async function share(id: string) {
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const session = await get(id)
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if (session.share) return session.share
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const share = await Share.create(id)
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await update(id, (draft) => {
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draft.share = share
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})
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for (const msg of await messages(id)) {
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await Share.sync("session/message/" + id + "/" + msg.id, msg)
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}
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return share
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}
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export async function update(id: string, editor: (session: Info) => void) {
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const { sessions } = state()
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const session = await get(id)
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if (!session) return
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editor(session)
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session.time.updated = Date.now()
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sessions.set(id, session)
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await Storage.writeJSON("session/info/" + id, session)
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Bus.publish(Event.Updated, {
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info: session,
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})
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return session
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}
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export async function messages(sessionID: string) {
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const result = [] as Message.Info[]
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const list = Storage.list("session/message/" + sessionID)
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for await (const p of list) {
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const read = await Storage.readJSON<Message.Info>(p).catch(() => {})
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if (!read) continue
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result.push(read)
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}
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result.sort((a, b) => (a.id > b.id ? 1 : -1))
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return result
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}
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export async function* list() {
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for await (const item of Storage.list("session/info")) {
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const sessionID = path.basename(item, ".json")
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yield get(sessionID)
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}
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}
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export function abort(sessionID: string) {
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const controller = pending.get(sessionID)
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if (!controller) return false
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controller.abort()
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pending.delete(sessionID)
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return true
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}
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async function updateMessage(msg: Message.Info) {
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await Storage.writeJSON(
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"session/message/" + msg.metadata.sessionID + "/" + msg.id,
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msg,
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)
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Bus.publish(Message.Event.Updated, {
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info: msg,
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})
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}
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export async function chat(input: {
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sessionID: string
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providerID: string
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modelID: string
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parts: Message.Part[]
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}) {
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const l = log.clone().tag("session", input.sessionID)
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l.info("chatting")
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const model = await LLM.findModel(input.providerID, input.modelID)
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let msgs = await messages(input.sessionID)
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const previous = msgs.at(-1)
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if (previous?.metadata.assistant) {
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const tokens =
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previous.metadata.assistant.tokens.input +
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previous.metadata.assistant.tokens.output
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if (
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tokens >
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(model.info.contextWindow - (model.info.maxOutputTokens ?? 0)) * 0.9
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) {
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await summarize({
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sessionID: input.sessionID,
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providerID: input.providerID,
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modelID: input.modelID,
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})
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return chat(input)
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}
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}
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using abort = lock(input.sessionID)
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const lastSummary = msgs.findLast(
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(msg) => msg.metadata.assistant?.summary === true,
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)
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if (lastSummary)
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msgs = msgs.filter(
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(msg) => msg.role === "system" || msg.id >= lastSummary.id,
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)
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const app = await App.use()
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if (msgs.length === 0) {
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const system: Message.Info = {
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id: Identifier.ascending("message"),
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role: "system",
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parts: [
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{
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type: "text",
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text: PROMPT_ANTHROPIC,
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},
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],
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metadata: {
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sessionID: input.sessionID,
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time: {
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created: Date.now(),
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},
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tool: {},
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},
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}
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const contextFile = Bun.file(path.join(app.root, "CONTEXT.md"))
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if (await contextFile.exists()) {
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const context = await contextFile.text()
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system.parts.push({
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type: "text",
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text: context,
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})
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}
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msgs.push(system)
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generateText({
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messages: convertToModelMessages([
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{
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role: "system",
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parts: [
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{
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type: "text",
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text: PROMPT_TITLE,
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},
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],
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},
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{
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role: "user",
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parts: input.parts,
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},
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]),
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model: model.instance,
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}).then((result) => {
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return Session.update(input.sessionID, (draft) => {
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draft.title = result.text
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})
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})
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await updateMessage(system)
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}
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const msg: Message.Info = {
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role: "user",
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id: Identifier.ascending("message"),
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parts: input.parts,
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metadata: {
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time: {
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created: Date.now(),
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},
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sessionID: input.sessionID,
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tool: {},
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},
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}
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await updateMessage(msg)
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msgs.push(msg)
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const next: Message.Info = {
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id: Identifier.ascending("message"),
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role: "assistant",
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parts: [],
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metadata: {
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assistant: {
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cost: 0,
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tokens: {
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input: 0,
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output: 0,
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reasoning: 0,
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},
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modelID: input.modelID,
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providerID: input.providerID,
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},
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time: {
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created: Date.now(),
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},
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sessionID: input.sessionID,
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tool: {},
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},
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}
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await updateMessage(next)
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const result = streamText({
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onStepFinish: async (step) => {
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const assistant = next.metadata!.assistant!
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const usage = getUsage(step.usage, model.info)
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assistant.cost = usage.cost
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assistant.tokens = usage.tokens
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await updateMessage(next)
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},
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abortSignal: abort.signal,
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maxRetries: 6,
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stopWhen: stepCountIs(1000),
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messages: convertToModelMessages(msgs),
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temperature: 0,
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tools,
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model: model.instance,
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})
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let text: Message.TextPart | undefined
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const reader = result.toUIMessageStream().getReader()
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while (true) {
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const result = await reader.read().catch((e) => {
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if (e instanceof DOMException && e.name === "AbortError") {
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return
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}
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throw e
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})
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if (!result) break
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const { done, value } = result
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if (done) break
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l.info("part", {
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type: value.type,
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})
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switch (value.type) {
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case "start":
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break
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case "start-step":
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text = undefined
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next.parts.push({
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type: "step-start",
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})
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break
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case "text":
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if (!text) {
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text = value
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next.parts.push(value)
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break
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}
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text.text += value.text
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break
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case "tool-call":
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next.parts.push({
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type: "tool-invocation",
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toolInvocation: {
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state: "call",
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...value,
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// hack until zod v4
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args: value.args as any,
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},
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})
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break
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case "tool-result":
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const match = next.parts.find(
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(p) =>
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p.type === "tool-invocation" &&
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p.toolInvocation.toolCallId === value.toolCallId,
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)
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if (match && match.type === "tool-invocation") {
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const { output, metadata } = value.result as any
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next.metadata!.tool[value.toolCallId] = metadata
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match.toolInvocation = {
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...match.toolInvocation,
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state: "result",
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result: output,
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}
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}
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break
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case "finish":
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break
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case "finish-step":
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break
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case "error":
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log.error("error", value)
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break
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default:
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l.info("unhandled", {
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type: value.type,
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})
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}
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await updateMessage(next)
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}
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next.metadata!.time.completed = Date.now()
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await updateMessage(next)
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return next
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}
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export async function summarize(input: {
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sessionID: string
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providerID: string
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modelID: string
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}) {
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using abort = lock(input.sessionID)
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const msgs = await messages(input.sessionID)
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const lastSummary = msgs.findLast(
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(msg) => msg.metadata.assistant?.summary === true,
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)?.id
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const filtered = msgs.filter(
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(msg) => msg.role !== "system" && (!lastSummary || msg.id >= lastSummary),
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)
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const model = await LLM.findModel(input.providerID, input.modelID)
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const next: Message.Info = {
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id: Identifier.ascending("message"),
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role: "assistant",
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parts: [],
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metadata: {
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tool: {},
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sessionID: input.sessionID,
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assistant: {
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summary: true,
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cost: 0,
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modelID: input.modelID,
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providerID: input.providerID,
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tokens: {
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input: 0,
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output: 0,
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reasoning: 0,
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},
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},
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time: {
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created: Date.now(),
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},
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},
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}
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await updateMessage(next)
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const result = await generateText({
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abortSignal: abort.signal,
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model: model.instance,
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messages: convertToModelMessages([
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{
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role: "system",
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parts: [
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{
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type: "text",
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text: PROMPT_SUMMARIZE,
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},
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],
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},
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...filtered,
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{
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role: "user",
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parts: [
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{
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type: "text",
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text: "Provide a detailed but concise summary of our conversation above. Focus on information that would be helpful for continuing the conversation, including what we did, what we're doing, which files we're working on, and what we're going to do next.",
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},
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],
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},
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]),
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})
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next.parts.push({
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type: "text",
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text: result.text,
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})
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const assistant = next.metadata!.assistant!
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const usage = getUsage(result.usage, model.info)
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assistant.cost = usage.cost
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assistant.tokens = usage.tokens
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await updateMessage(next)
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}
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const pending = new Map<string, AbortController>()
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function lock(sessionID: string) {
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log.info("locking", { sessionID })
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if (pending.has(sessionID)) throw new BusyError(sessionID)
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const controller = new AbortController()
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pending.set(sessionID, controller)
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return {
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signal: controller.signal,
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[Symbol.dispose]() {
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log.info("unlocking", { sessionID })
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pending.delete(sessionID)
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},
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}
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}
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function getUsage(usage: LanguageModelUsage, model: Provider.Model) {
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const tokens = {
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input: usage.inputTokens ?? 0,
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output: usage.outputTokens ?? 0,
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reasoning: usage.reasoningTokens ?? 0,
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}
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return {
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cost: new Decimal(0)
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.add(new Decimal(tokens.input).mul(model.cost.input))
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.add(new Decimal(tokens.output).mul(model.cost.output))
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.toNumber(),
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tokens,
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}
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}
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export class BusyError extends Error {
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constructor(public readonly sessionID: string) {
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super(`Session ${sessionID} is busy`)
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}
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}
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}
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