sync

js/src/bus/index.ts

@@ -0,0 +1,79 @@
+import type { z, ZodSchema } from "zod/v4";
+import { App } from "../app";
+import { Log } from "../util/log";
+
+export namespace Bus {
+  const log = Log.create({ service: "bus" });
+  type Subscription = (event: any) => void;
+
+  const state = App.state("bus", () => {
+    const subscriptions = new Map<any, Subscription[]>();
+
+    return {
+      subscriptions,
+    };
+  });
+
+  export type EventDefinition = ReturnType<typeof event>;
+
+  export function event<Type extends string, Properties extends ZodSchema>(
+    type: Type,
+    properties: Properties,
+  ) {
+    return {
+      type,
+      properties,
+    };
+  }
+
+  export function publish<Definition extends EventDefinition>(
+    def: Definition,
+    properties: z.output<Definition["properties"]>,
+  ) {
+    const payload = {
+      type: def.type,
+      properties,
+    };
+    log.info("publishing", {
+      type: def.type,
+      ...properties,
+    });
+    for (const key of [def.type, "*"]) {
+      const match = state().subscriptions.get(key);
+      for (const sub of match ?? []) {
+        sub(payload);
+      }
+    }
+  }
+
+  export function subscribe<Definition extends EventDefinition>(
+    def: Definition,
+    callback: (event: {
+      type: Definition["type"];
+      properties: z.infer<Definition["properties"]>;
+    }) => void,
+  ) {
+    return raw(def.type, callback);
+  }
+
+  export function subscribeAll(callback: (event: any) => void) {
+    return raw("*", callback);
+  }
+
+  function raw(type: string, callback: (event: any) => void) {
+    log.info("subscribing", { type });
+    const subscriptions = state().subscriptions;
+    let match = subscriptions.get(type) ?? [];
+    match.push(callback);
+    subscriptions.set(type, match);
+
+    return () => {
+      log.info("unsubscribing", { type });
+      const match = subscriptions.get(type);
+      if (!match) return;
+      const index = match.indexOf(callback);
+      if (index === -1) return;
+      match.splice(index, 1);
+    };
+  }
+}

js/src/id/id.ts

@@ -1,4 +1,4 @@
-import { z } from "zod";
+import { z } from "zod/v4";
 import { randomBytes } from "crypto";
 
 export namespace Identifier {
@@ -11,7 +11,7 @@ export namespace Identifier {
     return z.string().startsWith(prefixes[prefix]);
   }
 
-  const LENGTH = 24;
+  const LENGTH = 26;
 
   export function ascending(prefix: keyof typeof prefixes, given?: string) {
     return generateID(prefix, false, given);
@@ -45,6 +45,11 @@ export namespace Identifier {
     const randLength = (LENGTH - 12) / 2;
     const random = randomBytes(randLength);
 
-    return prefix + "_" + timeBytes.toString("hex") + random.toString("hex");
+    return (
+      prefixes[prefix] +
+      "_" +
+      timeBytes.toString("hex") +
+      random.toString("hex")
+    );
   }
 }

js/src/index.ts

@@ -1,29 +1,11 @@
 import { App } from "./app";
 import process from "node:process";
-import { RPC } from "./server/server";
-import { Session } from "./session/session";
-import { Identifier } from "./id/id";
+import { Server } from "./server/server";
 
 const app = await App.create({
   directory: process.cwd(),
 });
 
 App.provide(app, async () => {
-  const sessionID = await Session.list()
-    [Symbol.asyncIterator]()
-    .next()
-    .then((v) => v.value ?? Session.create().then((s) => s.id));
-
-  await Session.chat(sessionID, {
-    role: "user",
-    id: Identifier.ascending("message"),
-    parts: [
-      {
-        type: "text",
-        text: "Hey how are you? try to use tools",
-      },
-    ],
-  });
-
-  const rpc = RPC.listen();
+  const server = Server.listen();
 });

js/src/server/server.ts

@@ -1,34 +1,64 @@
 import { Log } from "../util/log";
+import { Bus } from "../bus";
 
-export namespace RPC {
-  const log = Log.create({ service: "rpc" });
+import { Hono } from "hono";
+import { streamSSE } from "hono/streaming";
+import { Session } from "../session/session";
+import { zValidator } from "@hono/zod-validator";
+import { z } from "zod";
+
+export namespace Server {
+  const log = Log.create({ service: "server" });
   const PORT = 16713;
-  export function listen(input?: { port?: number }) {
-    const port = input?.port ?? PORT;
-    log.info("trying", { port });
-    try {
-      const server = Bun.serve({
-        port,
-        websocket: {
-          open() {},
-          message() {},
+
+  export type App = ReturnType<typeof listen>;
+
+  export function listen() {
+    const app = new Hono()
+      .get("/event", async (c) => {
+        log.info("event connected");
+        return streamSSE(c, async (stream) => {
+          const unsub = Bus.subscribeAll(async (event) => {
+            await stream.writeSSE({
+              data: JSON.stringify(event),
+            });
+          });
+          await new Promise<void>((resolve) => {
+            stream.onAbort(() => {
+              unsub();
+              resolve();
+              log.info("event disconnected");
+            });
+          });
+        });
+      })
+      .post("/session_create", async (c) => {
+        const session = await Session.create();
+        return c.json(session);
+      })
+      .post(
+        "/session_chat",
+        zValidator(
+          "json",
+          z.object({
+            sessionID: z.string(),
+            parts: z.custom<Session.Message["parts"]>(),
+          }),
+        ),
+        async (c) => {
+          const body = c.req.valid("json");
+          const msg = await Session.chat(body.sessionID, ...body.parts);
+          return c.json(msg);
         },
-        routes: {
-          "/ws": (req, server) => {
-            if (server.upgrade(req)) return;
-            return new Response("Not a websocket request", { status: 400 });
-          },
-        },
-      });
-      log.info("listening", { port });
-      return {
-        server,
-      };
-    } catch (e: any) {
-      if (e?.code === "EADDRINUSE") {
-        return listen({ port: port + 1 });
-      }
-      throw e;
-    }
+      );
+
+    Bun.serve({
+      port: PORT,
+      hostname: "0.0.0.0",
+      idleTimeout: 0,
+      fetch: app.fetch,
+    });
+
+    return app;
   }
 }

js/src/session/session.ts

@@ -1,5 +1,5 @@
 import path from "path";
-import { z } from "zod";
+import { z } from "zod/v3";
 import { App } from "../app/";
 import { Identifier } from "../id/id";
 import { LLM } from "../llm/llm";
@@ -11,7 +11,9 @@ import {
   tool,
   type TextUIPart,
   type ToolInvocationUIPart,
+  type UIDataTypes,
   type UIMessage,
+  type UIMessagePart,
 } from "ai";
 
 export namespace Session {
@@ -20,11 +22,18 @@ export namespace Session {
   export interface Info {
     id: string;
     title: string;
+    tokens: {
+      input: number;
+      output: number;
+      reasoning: number;
+    };
   }
 
+  export type Message = UIMessage<{ sessionID: string }>;
+
   const state = App.state("session", () => {
     const sessions = new Map<string, Info>();
-    const messages = new Map<string, UIMessage[]>();
+    const messages = new Map<string, Message[]>();
 
     return {
       sessions,
@@ -36,12 +45,14 @@ export namespace Session {
     const result: Info = {
       id: Identifier.descending("session"),
       title: "New Session - " + new Date().toISOString(),
+      tokens: {
+        input: 0,
+        output: 0,
+        reasoning: 0,
+      },
     };
     log.info("created", result);
-    await Storage.write(
-      "session/info/" + result.id + ".json",
-      JSON.stringify(result),
-    );
+    await Storage.writeJSON("session/info/" + result.id, result);
     state().sessions.set(result.id, result);
     return result;
   }
@@ -51,23 +62,35 @@ export namespace Session {
     if (result) {
       return result;
     }
-    const read = JSON.parse(await Storage.readToString("session/info/" + id));
+    const read = await Storage.readJSON<Info>("session/info/" + id);
     state().sessions.set(id, read);
-    return read;
+    return read as Info;
+  }
+
+  export async function update(session: Info) {
+    state().sessions.set(session.id, session);
+    await Storage.writeJSON("session/info/" + session.id, session);
   }
 
   export async function messages(sessionID: string) {
-    const result = state().messages.get(sessionID);
-    if (result) {
-      return result;
+    const match = state().messages.get(sessionID);
+    if (match) {
+      return match;
     }
-    const read = JSON.parse(
-      await Storage.readToString(
-        "session/message/" + sessionID + ".json",
-      ).catch(() => "[]"),
-    );
-    state().messages.set(sessionID, read);
-    return read;
+    const result = [] as Message[];
+    const list = await Storage.list("session/message/" + sessionID)
+      .then((x) => x.toArray())
+      .catch(() => {});
+    if (!list) return result;
+    for (const item of list) {
+      const messageID = path.basename(item.path, ".json");
+      const read = await Storage.readJSON<Message>(
+        "session/message/" + sessionID + "/" + messageID,
+      );
+      result.push(read);
+    }
+    state().messages.set(sessionID, result);
+    return result;
   }
 
   export async function* list() {
@@ -81,11 +104,23 @@ export namespace Session {
     }
   }
 
-  export async function chat(sessionID: string, msg: UIMessage) {
+  export async function chat(
+    sessionID: string,
+    ...parts: UIMessagePart<UIDataTypes>[]
+  ) {
+    const session = await get(sessionID);
     const l = log.clone().tag("session", sessionID);
     l.info("chatting");
-    const msgs = (await messages(sessionID)) ?? [
-      {
+
+    const msgs = await messages(sessionID);
+    async function write(msg: Message) {
+      return Storage.writeJSON(
+        "session/message/" + sessionID + "/" + msg.id,
+        msg,
+      );
+    }
+    if (msgs.length === 0) {
+      const system: UIMessage<{ sessionID: string }> = {
         id: Identifier.ascending("message"),
         role: "system",
         parts: [
@@ -94,40 +129,38 @@ export namespace Session {
             text: "You are a helpful assistant called opencode",
           },
         ],
-      } as UIMessage,
-    ];
-    msgs.push(msg);
-    state().messages.set(sessionID, msgs);
-    async function write() {
-      return Storage.write(
-        "session/message/" + sessionID + ".json",
-        JSON.stringify(msgs),
-      );
+        metadata: {
+          sessionID,
+        },
+      };
+      msgs.push(system);
+      state().messages.set(sessionID, msgs);
+      await write(system);
     }
-    await write();
+    const msg: Message = {
+      role: "user",
+      id: Identifier.ascending("message"),
+      parts,
+      metadata: {
+        sessionID,
+      },
+    };
+    msgs.push(msg);
+    await write(msg);
 
     const model = await LLM.findModel("claude-3-7-sonnet-20250219");
     const result = streamText({
       messages: convertToModelMessages(msgs),
       temperature: 0,
-      tools: {
-        test: tool({
-          id: "opencode.test" as const,
-          parameters: z.object({
-            feeling: z.string(),
-          }),
-          execute: async () => {
-            return `Hello`;
-          },
-          description: "call this tool to get a greeting",
-        }),
-      },
       model,
     });
-    const next: UIMessage = {
+    const next: Message = {
       id: Identifier.ascending("message"),
       role: "assistant",
       parts: [],
+      metadata: {
+        sessionID,
+      },
     };
     msgs.push(next);
     let text: TextUIPart | undefined;
@@ -135,7 +168,9 @@ export namespace Session {
     while (true) {
       const { done, value } = await reader.read();
       if (done) break;
-      l.info("part", value);
+      l.info("part", {
+        type: value.type,
+      });
       switch (value.type) {
         case "start":
           break;
@@ -175,15 +210,15 @@ export namespace Session {
               state: "result",
               result: value.result,
             };
-            await write();
           }
           break;
 
         case "finish":
-          await write();
           break;
         case "finish-step":
-          await write();
+          break;
+        case "error":
+          log.error("error", value);
           break;
 
         default:
@@ -191,6 +226,13 @@ export namespace Session {
             type: value.type,
           });
       }
+      await write(next);
     }
+    const usage = await result.totalUsage;
+    session.tokens.input += usage.inputTokens || 0;
+    session.tokens.output += usage.outputTokens || 0;
+    session.tokens.reasoning += usage.reasoningTokens || 0;
+    await update(session);
+    return next;
   }
 }

js/src/storage/storage.ts

@@ -4,10 +4,19 @@ import fs from "fs/promises";
 import { Log } from "../util/log";
 import { App } from "../app";
 import { AppPath } from "../app/path";
+import { Bus } from "../bus";
+import z from "zod/v4";
 
 export namespace Storage {
   const log = Log.create({ service: "storage" });
 
+  export const Event = {
+    Write: Bus.event(
+      "storage.write",
+      z.object({ key: z.string(), body: z.any() }),
+    ),
+  };
+
   const state = App.state("storage", async () => {
     const app = await App.use();
     const storageDir = AppPath.storage(app.root);
@@ -36,4 +45,15 @@ export namespace Storage {
   export const read = expose("read");
   export const list = expose("list");
   export const readToString = expose("readToString");
+
+  export async function readJSON<T>(key: string) {
+    const data = await readToString(key + ".json");
+    return JSON.parse(data) as T;
+  }
+
+  export async function writeJSON<T>(key: string, data: T) {
+    Bus.publish(Event.Write, { key, body: data });
+    const json = JSON.stringify(data);
+    await write(key + ".json", json);
+  }
 }

js/src/util/log.ts

@@ -2,16 +2,21 @@ export namespace Log {
   export function create(tags?: Record<string, any>) {
     tags = tags || {};
 
+    function build(message: any, extra?: Record<string, any>) {
+      const prefix = Object.entries({
+        ...tags,
+        ...extra,
+      })
+        .map(([key, value]) => `${key}=${value}`)
+        .join(" ");
+      return [prefix, message];
+    }
     const result = {
       info(message?: any, extra?: Record<string, any>) {
-        const prefix = Object.entries({
-          ...tags,
-          ...extra,
-        })
-          .map(([key, value]) => `${key}=${value}`)
-          .join(" ");
-        console.log(prefix, message);
-        return result;
+        console.log(...build(message, extra));
+      },
+      error(message?: any, extra?: Record<string, any>) {
+        console.error(...build(message, extra));
       },
       tag(key: string, value: string) {
         if (tags) tags[key] = value;