@tanstack/offline-transactions/dist/esm/coordination/WebLocksLeader.js

Offline-first transaction capabilities for TanStack DB

import { BaseLeaderElection } from "./LeaderElection.js";
class WebLocksLeader extends BaseLeaderElection {
  constructor(lockName = `offline-executor-leader`) {
    super();
    this.releaseLock = null;
    this.lockName = lockName;
  }
  async requestLeadership() {
    if (!this.isWebLocksSupported()) {
      return false;
    }
    if (this.isLeaderState) {
      return true;
    }
    try {
      const available = await navigator.locks.request(
        this.lockName,
        {
          mode: `exclusive`,
          ifAvailable: true
        },
        (lock) => {
          return lock !== null;
        }
      );
      if (!available) {
        return false;
      }
      this.isLeaderState = true;
      navigator.locks.request(
        this.lockName,
        {
          mode: `exclusive`
        },
        async (lock) => {
          if (lock) {
            this.notifyLeadershipChange(true);
            return new Promise((resolve) => {
              this.releaseLock = () => {
                this.notifyLeadershipChange(false);
                resolve();
              };
            });
          }
        }
      );
      return true;
    } catch (error) {
      if (error instanceof Error && error.name === `AbortError`) {
        return false;
      }
      console.warn(`Web Locks leadership request failed:`, error);
      return false;
    }
  }
  releaseLeadership() {
    if (this.releaseLock) {
      this.releaseLock();
      this.releaseLock = null;
    }
  }
  isWebLocksSupported() {
    return typeof navigator !== `undefined` && `locks` in navigator;
  }
  static isSupported() {
    return typeof navigator !== `undefined` && `locks` in navigator;
  }
}
export {
  WebLocksLeader
};
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