Add client runtime and hello handshake

plugin/core/runtime.ts

@@ -0,0 +1,158 @@
+import {
+  YONEXUS_PROTOCOL_VERSION,
+  buildHello,
+  decodeBuiltin,
+  encodeBuiltin,
+  isBuiltinMessage,
+  type HelloAckPayload,
+  type TypedBuiltinEnvelope
+} from "../../../Yonexus.Protocol/src/index.js";
+import type { YonexusClientConfig } from "./config.js";
+import {
+  createInitialClientState,
+  hasClientKeyPair,
+  hasClientSecret,
+  type YonexusClientState,
+  type YonexusClientStateStore
+} from "./state.js";
+import type { ClientConnectionState, ClientTransport } from "./transport.js";
+
+export type YonexusClientPhase =
+  | "idle"
+  | "starting"
+  | "awaiting_hello_ack"
+  | "pair_required"
+  | "waiting_pair_confirm"
+  | "auth_required"
+  | "authenticated"
+  | "stopped";
+
+export interface YonexusClientRuntimeOptions {
+  config: YonexusClientConfig;
+  transport: ClientTransport;
+  stateStore: YonexusClientStateStore;
+  now?: () => number;
+}
+
+export interface YonexusClientRuntimeState {
+  readonly phase: YonexusClientPhase;
+  readonly transportState: ClientConnectionState;
+  readonly clientState: YonexusClientState;
+}
+
+export class YonexusClientRuntime {
+  private readonly options: YonexusClientRuntimeOptions;
+  private readonly now: () => number;
+  private clientState: YonexusClientState;
+  private phase: YonexusClientPhase = "idle";
+
+  constructor(options: YonexusClientRuntimeOptions) {
+    this.options = options;
+    this.now = options.now ?? (() => Math.floor(Date.now() / 1000));
+    this.clientState = createInitialClientState(options.config.identifier);
+  }
+
+  get state(): YonexusClientRuntimeState {
+    return {
+      phase: this.phase,
+      transportState: this.options.transport.state,
+      clientState: this.clientState
+    };
+  }
+
+  async start(): Promise<void> {
+    if (this.phase !== "idle" && this.phase !== "stopped") {
+      return;
+    }
+
+    this.phase = "starting";
+    this.clientState = await this.options.stateStore.load(this.options.config.identifier);
+    await this.options.transport.connect();
+  }
+
+  async stop(): Promise<void> {
+    await this.options.stateStore.save({
+      ...this.clientState,
+      updatedAt: this.now()
+    });
+    this.options.transport.disconnect();
+    this.phase = "stopped";
+  }
+
+  async handleMessage(raw: string): Promise<void> {
+    if (raw === "heartbeat_tick") {
+      return;
+    }
+
+    if (!isBuiltinMessage(raw)) {
+      return;
+    }
+
+    const envelope = decodeBuiltin(raw);
+    if (envelope.type === "hello_ack") {
+      this.handleHelloAck(envelope as TypedBuiltinEnvelope<"hello_ack">);
+      return;
+    }
+
+    if (envelope.type === "auth_success") {
+      this.phase = "authenticated";
+      return;
+    }
+  }
+
+  handleTransportStateChange(state: ClientConnectionState): void {
+    if (state === "connected") {
+      this.sendHello();
+    }
+
+    if (state === "disconnected") {
+      this.phase = "idle";
+    }
+  }
+
+  private sendHello(): void {
+    this.phase = "awaiting_hello_ack";
+    this.options.transport.send(
+      encodeBuiltin(
+        buildHello(
+          {
+            identifier: this.options.config.identifier,
+            hasSecret: hasClientSecret(this.clientState),
+            hasKeyPair: hasClientKeyPair(this.clientState),
+            publicKey: this.clientState.publicKey,
+            protocolVersion: YONEXUS_PROTOCOL_VERSION
+          },
+          { timestamp: this.now() }
+        )
+      )
+    );
+  }
+
+  private handleHelloAck(envelope: TypedBuiltinEnvelope<"hello_ack">): void {
+    const payload = envelope.payload as HelloAckPayload | undefined;
+    if (!payload) {
+      return;
+    }
+
+    switch (payload.nextAction) {
+      case "pair_required":
+        this.phase = "pair_required";
+        break;
+      case "waiting_pair_confirm":
+        this.phase = "waiting_pair_confirm";
+        break;
+      case "auth_required":
+        this.phase = "auth_required";
+        break;
+      default:
+        this.phase = "idle";
+        break;
+    }
+  }
+}
+
+export function createYonexusClientRuntime(
+  options: YonexusClientRuntimeOptions
+): YonexusClientRuntime {
+  return new YonexusClientRuntime(options);
+}