implement background send, requestID

packages/sdk/src/messaging/message_store.ts

@@ -80,10 +80,7 @@ export class MessageStore {
     }
   }
 
-  public async queue(
-    encoder: IEncoder,
-    message: IMessage
-  ): Promise<RequestId | undefined> {
+  public async queue(encoder: IEncoder, message: IMessage): Promise<RequestId> {
     const requestId = crypto.randomUUID();
 
     this.pendingRequests.set(requestId, {

packages/sdk/src/messaging/sender.ts

@@ -11,16 +11,46 @@ export class Sender {
   private readonly messageStore: MessageStore;
   private readonly lightPush: ILightPush;
 
+  private sendInterval: ReturnType<typeof setInterval> | null = null;
+
   public constructor(params: SenderConstructorParams) {
     this.messageStore = params.messageStore;
     this.lightPush = params.lightPush;
   }
 
-  public async send(encoder: IEncoder, message: IMessage): Promise<void> {
+  public start(): void {
+    this.sendInterval = setInterval(() => void this.backgroundSend(), 1000);
+  }
+
+  public stop(): void {
+    if (this.sendInterval) {
+      clearInterval(this.sendInterval);
+      this.sendInterval = null;
+    }
+  }
+
+  public async send(encoder: IEncoder, message: IMessage): Promise<string> {
     const requestId = await this.messageStore.queue(encoder, message);
-    await this.lightPush.send(encoder, message);
-    if (requestId) {
+    const response = await this.lightPush.send(encoder, message);
+
+    if (response.successes.length > 0) {
       await this.messageStore.markSent(requestId);
     }
+
+    return requestId;
+  }
+
+  private async backgroundSend(): Promise<void> {
+    const pendingRequests = this.messageStore.getMessagesToSend();
+
+    // todo: implement chunking, error handling, retry, etc.
+    // todo: implement backoff and batching potentially
+    for (const { requestId, encoder, message } of pendingRequests) {
+      const response = await this.lightPush.send(encoder, message);
+
+      if (response.successes.length > 0) {
+        await this.messageStore.markSent(requestId);
+      }
+    }
   }
 }