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270 lines
11 KiB
TypeScript
270 lines
11 KiB
TypeScript
// s10: Runtime Modes — mini Pi 的第 10 版
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//
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// core 只产生事件，怎么展示由外层 mode 决定。[R7 收获] s01 的 Output 抽象，长成可切换的 RuntimeMode。
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// 词汇边界：本章新增 RuntimeMode / PrintMode / JsonMode / createDemoRuntimeEvents / render。
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// 关键：Output 保留（过程打印），RuntimeMode 新增（结果展示）；同一个 core 产同一批事件，不同 mode 展示成不同形式。
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declare const process: {
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exitCode?: number;
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};
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// —— 停止原因（s04 起）——
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export type StopReason = "stop" | "toolUse" | "error";
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// —— 消息 ——
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export type UserMessage = { role: "user"; content: string };
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export type AssistantMessage = { role: "assistant"; content: string; stopReason: StopReason };
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export type ToolResultMessage = { role: "toolResult"; toolCallId: string; content: string };
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export type AgentMessage = UserMessage | AssistantMessage | ToolResultMessage;
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// —— 会话历史（s07 起）——
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export type SessionEntry = { id: string; parentId: string | null; message: AgentMessage };
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export class SessionTree {
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private entries = new Map<string, SessionEntry>();
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private activeLeafId: string | null = null;
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private counter = 0;
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append(message: AgentMessage): SessionEntry {
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const entry = { id: `e${++this.counter}`, parentId: this.activeLeafId, message };
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this.entries.set(entry.id, entry);
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this.activeLeafId = entry.id;
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return entry;
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}
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moveTo(entryId: string): void {
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if (!this.entries.has(entryId)) throw new Error(`unknown entry: ${entryId}`);
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this.activeLeafId = entryId;
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}
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currentPath(): AgentMessage[] {
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const path: AgentMessage[] = [];
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let cursor = this.activeLeafId;
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while (cursor) {
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const entry = this.entries.get(cursor);
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if (!entry) break;
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path.push(entry.message);
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cursor = entry.parentId;
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}
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return path.reverse();
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}
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allEntries(): SessionEntry[] { return [...this.entries.values()]; }
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}
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export type AgentState = { session: SessionTree; model: string };
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// —— 工具契约（s02 起）——
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export type ToolSpec = { name: string; description: string; input: Record<string, string> };
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export type ToolHandler = (input: Record<string, string>) => string;
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export type ToolCall = { id: string; name: string; input: Record<string, string> };
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export type Tool = { spec: ToolSpec; handler: ToolHandler };
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export class ToolRegistry {
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private tools = new Map<string, Tool>();
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register(tool: Tool): void { this.tools.set(tool.spec.name, tool); }
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getSpecs(): ToolSpec[] { return [...this.tools.values()].map((tool) => tool.spec); }
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count(): number { return this.tools.size; }
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run(call: ToolCall): string {
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const tool = this.tools.get(call.name);
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if (!tool) return `unknown tool: ${call.name}`;
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return tool.handler(call.input);
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}
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}
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// —— 上下文资源（s08 起）——
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export type ContextResource = { kind: "agents" | "skill" | "prompt"; name: string; content: string };
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export class ResourceLoader {
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constructor(private resources: ContextResource[]) {}
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load(): ContextResource[] { return this.resources.map((r) => ({ ...r })); }
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}
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// s08：资源组装进 systemPrompt（对齐 Pi buildSystemPrompt）
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export function buildSystemPrompt(resources: ContextResource[]): string {
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return resources.map((r) => `[${r.kind}:${r.name}]\n${r.content}`).join("\n\n");
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}
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// —— provider 对外 ——
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export type ProviderMessage =
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| { role: "user" | "assistant"; content: string }
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| { role: "toolResult"; toolCallId: string; content: string };
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export type ProviderInput = { systemPrompt: string; messages: ProviderMessage[]; tools: ToolSpec[] };
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export type ProviderEvent =
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| { type: "message_start" }
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| { type: "text_delta"; text: string }
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| { type: "tool_call"; call: ToolCall }
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| { type: "message_end"; stopReason: StopReason };
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export interface Provider { stream(input: ProviderInput): AsyncGenerator<ProviderEvent>; }
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// —— s01 起：输出抽象（R7。s10 会再加 RuntimeMode，两者并存）——
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export type Output = { log(line: string): void };
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export function createConsoleOutput(): Output { return { log: (line) => console.log(line) }; }
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// —— s05 起：执行插口 ——
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export type BeforeToolCallResult = { type: "allow" } | { type: "block"; reason: string };
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export type ToolHooks = {
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beforeToolCall?: (call: ToolCall) => BeforeToolCallResult;
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afterToolCall?: (call: ToolCall, result: string) => string;
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};
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export function executeToolCall(registry: ToolRegistry, hooks: ToolHooks, call: ToolCall): ToolResultMessage {
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const before = hooks.beforeToolCall?.(call) ?? { type: "allow" };
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if (before.type === "block") {
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return { role: "toolResult", toolCallId: call.id, content: `blocked: ${before.reason}` };
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}
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let result: string;
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try { result = registry.run(call); }
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catch (error) { result = `error: ${error instanceof Error ? error.message : String(error)}`; }
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const finalResult = hooks.afterToolCall?.(call, result) ?? result;
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return { role: "toolResult", toolCallId: call.id, content: finalResult };
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}
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// —— s06 起：一轮快照 ——
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export type TurnSnapshot = { systemPrompt: string; messages: ProviderMessage[]; tools: ToolSpec[] };
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function toProviderMessages(messages: AgentMessage[]): ProviderMessage[] {
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return messages.map((message) => {
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if (message.role === "toolResult") {
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return { role: "toolResult", toolCallId: message.toolCallId, content: message.content };
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}
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return { role: message.role, content: message.content };
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});
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}
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export function createTurnSnapshot(state: AgentState, registry: ToolRegistry, loader: ResourceLoader): TurnSnapshot {
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return {
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systemPrompt: buildSystemPrompt(loader.load()),
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messages: toProviderMessages(state.session.currentPath()),
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tools: registry.getSpecs(),
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};
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}
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export function buildProviderInputFromSnapshot(snapshot: TurnSnapshot, state: AgentState): ProviderInput {
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return {
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systemPrompt: snapshot.systemPrompt,
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messages: toProviderMessages(state.session.currentPath()),
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tools: snapshot.tools,
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};
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}
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// ============ 构造函数 ============
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export function createInitialState(model = "demo-small"): AgentState { return { session: new SessionTree(), model }; }
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export function createUserMessage(content: string): UserMessage { return { role: "user", content }; }
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// ============ 工具循环（s04 起，保留不动）============
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const MAX_TURNS = 8;
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export async function runEventedToolLoop(
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state: AgentState, provider: Provider, registry: ToolRegistry,
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hooks: ToolHooks, snapshot: TurnSnapshot, output: Output,
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): Promise<AssistantMessage> {
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let turns = 0;
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while (true) {
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turns += 1;
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if (turns > MAX_TURNS) {
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const stopped: AssistantMessage = { role: "assistant", content: "(达到最大轮次，停止)", stopReason: "stop" };
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state.session.append(stopped);
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return stopped;
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}
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const providerInput = buildProviderInputFromSnapshot(snapshot, state);
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let content = "";
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let stopReason: StopReason = "stop";
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let sawToolCall = false;
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for await (const event of provider.stream(providerInput)) {
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if (event.type === "message_start") output.log("message_start");
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else if (event.type === "text_delta") { output.log(`text_delta: ${event.text}`); content += event.text; }
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else if (event.type === "tool_call") {
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sawToolCall = true;
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output.log(`tool_call: ${event.call.name}`);
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const resultMessage = executeToolCall(registry, hooks, event.call);
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state.session.append(resultMessage);
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output.log(`tool_result: ${resultMessage.content}`);
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} else if (event.type === "message_end") { stopReason = event.stopReason; output.log(`message_end: ${stopReason}`); }
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}
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if (!sawToolCall || stopReason !== "toolUse") {
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const assistant: AssistantMessage = { role: "assistant", content, stopReason };
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state.session.append(assistant);
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return assistant;
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}
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}
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}
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// ============ s09 起：扩展运行时 ============
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export type RuntimeEvent = { type: "message"; content: string } | { type: "done" }; // U2 全局唯一
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type EventHandler<T extends RuntimeEvent["type"]> = (event: Extract<RuntimeEvent, { type: T }>) => void;
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export type Command = { name: string; run: () => string };
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export type ExtensionAPI = {
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on<T extends RuntimeEvent["type"]>(type: T, handler: EventHandler<T>): void;
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registerTool(tool: Tool): void;
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registerCommand(command: Command): void;
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};
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export type Extension = (api: ExtensionAPI) => void;
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export class ExtensionRuntime {
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private commands = new Map<string, Command>();
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private handlers: { type: RuntimeEvent["type"]; handler: (event: RuntimeEvent) => void }[] = [];
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constructor(private registry: ToolRegistry) {}
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createApi(): ExtensionAPI {
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return {
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on: (type, handler) => { this.handlers.push({ type, handler: handler as (event: RuntimeEvent) => void }); },
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registerTool: (tool) => { this.registry.register(tool); },
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registerCommand: (command) => { this.commands.set(command.name, command); },
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};
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}
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use(extension: Extension): void { extension(this.createApi()); }
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emit(event: RuntimeEvent): void {
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for (const { type, handler } of this.handlers) if (type === event.type) handler(event);
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}
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runCommand(name: string): string {
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const command = this.commands.get(name);
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if (!command) return `unknown command: ${name}`;
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return command.run();
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}
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}
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// ============ s10 新增 [R7 收获]：运行方式（输出分离）============
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// 为了压缩本节 demo，只造一批最小 RuntimeEvent。
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// 它不是替换前面累积出来的 tool loop，只是演示 mode 如何消费同一批事件。
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export function createDemoRuntimeEvents(input: string): RuntimeEvent[] {
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return [
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{ type: "message", content: `收到：${input}` },
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{ type: "done" },
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];
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}
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// 输出方式：消费同一批事件，展示成不同形式。
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export type RuntimeMode = {
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render(events: RuntimeEvent[]): void;
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};
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// 人类可读：只打印 message 的内容。
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export class PrintMode implements RuntimeMode {
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render(events: RuntimeEvent[]): void {
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for (const event of events) {
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if (event.type === "message") {
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console.log(event.content);
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}
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}
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}
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}
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// 结构化：每个事件一行 JSON，给机器消费。
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export class JsonMode implements RuntimeMode {
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render(events: RuntimeEvent[]): void {
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for (const event of events) {
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console.log(JSON.stringify(event));
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}
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}
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}
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// ============ 演示脚手架 ============
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function main(): void {
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const events = createDemoRuntimeEvents("你好，mini Pi");
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console.log("s10: Runtime Modes");
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console.log("");
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console.log("[print mode]");
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new PrintMode().render(events);
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console.log("");
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console.log("[json mode]");
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new JsonMode().render(events);
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console.log("");
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}
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try {
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main();
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} catch (error: unknown) {
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console.error(error);
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process.exitCode = 1;
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}
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