hereconnect/services/message-delivery-method-web-push/src/serviceSeqTracker.ts

import { serviceDb, type ServiceDoc } from "./dbs";

const SERVICE_DOC_ID = "_local/service:message-delivery-method-web-push";

export class ServiceSeqTracker {
  private serviceDoc: ServiceDoc;

  async getSince() {
    this.serviceDoc = await serviceDb.get(SERVICE_DOC_ID).catch((error) => {
      if (error.name === "not_found") {
        return {
          _id: SERVICE_DOC_ID,
          lastSeq: "0",
        };
      }
      throw error; // Re-throw other errors
    });

    // this.serviceDoc.lastSeq =
    //   "126-g1AAAACLeJzLYWBgYMpgTmHgzcvPy09JdcjLz8gvLskBCScyJNX___8_K4M50SUXKMCebGlpnmxpiq4Yh_Y8FiDJ0ACk_kNNsQKbYpSakphkYYKuJwsAb2YrPw";

    return this.serviceDoc.lastSeq;
  }

  checkNextSeq(seq: number | string) {
    const next = parseInt(seq as string, 10);
    const current = parseInt(this.serviceDoc.lastSeq as string, 10);
    if (next < current) {
      throw new Error(
        `Sequence number is too old: ${seq} (${next} < ${current})`,
      );
    }
  }

  saveSeq(seq: number | string) {
    this.serviceDoc.lastSeq = seq;
    return serviceDb.put(this.serviceDoc);
  }
}