@tanstack/offline-transactions/dist/cjs/coordination/WebLocksLeader.cjs.map

Offline-first transaction capabilities for TanStack DB

{"version":3,"file":"WebLocksLeader.cjs","sources":["../../../src/coordination/WebLocksLeader.ts"],"sourcesContent":["import { BaseLeaderElection } from './LeaderElection'\n\nexport class WebLocksLeader extends BaseLeaderElection {\n  private lockName: string\n  private releaseLock: (() => void) | null = null\n\n  constructor(lockName = `offline-executor-leader`) {\n    super()\n    this.lockName = lockName\n  }\n\n  async requestLeadership(): Promise<boolean> {\n    if (!this.isWebLocksSupported()) {\n      return false\n    }\n\n    if (this.isLeaderState) {\n      return true\n    }\n\n    try {\n      // First try to acquire the lock with ifAvailable\n      const available = await navigator.locks.request(\n        this.lockName,\n        {\n          mode: `exclusive`,\n          ifAvailable: true,\n        },\n        (lock) => {\n          return lock !== null\n        },\n      )\n\n      if (!available) {\n        return false\n      }\n\n      // Set state immediately to prevent duplicate notifications\n      // when the async lock acquisition calls notifyLeadershipChange(true).\n      // The guard in notifyLeadershipChange checks `isLeaderState !== isLeader`,\n      // so setting this to true here prevents the callback from firing again.\n      this.isLeaderState = true\n\n      // Lock is available, now acquire it for real and hold it\n      navigator.locks.request(\n        this.lockName,\n        {\n          mode: `exclusive`,\n        },\n        async (lock) => {\n          if (lock) {\n            this.notifyLeadershipChange(true)\n            // Hold the lock until released\n            return new Promise<void>((resolve) => {\n              this.releaseLock = () => {\n                this.notifyLeadershipChange(false)\n                resolve()\n              }\n            })\n          }\n        },\n      )\n\n      return true\n    } catch (error) {\n      if (error instanceof Error && error.name === `AbortError`) {\n        return false\n      }\n      console.warn(`Web Locks leadership request failed:`, error)\n      return false\n    }\n  }\n\n  releaseLeadership(): void {\n    if (this.releaseLock) {\n      this.releaseLock()\n      this.releaseLock = null\n    }\n  }\n\n  private isWebLocksSupported(): boolean {\n    return typeof navigator !== `undefined` && `locks` in navigator\n  }\n\n  static isSupported(): boolean {\n    return typeof navigator !== `undefined` && `locks` in navigator\n  }\n}\n"],"names":["BaseLeaderElection"],"mappings":";;;AAEO,MAAM,uBAAuBA,eAAAA,mBAAmB;AAAA,EAIrD,YAAY,WAAW,2BAA2B;AAChD,UAAA;AAHF,SAAQ,cAAmC;AAIzC,SAAK,WAAW;AAAA,EAClB;AAAA,EAEA,MAAM,oBAAsC;AAC1C,QAAI,CAAC,KAAK,uBAAuB;AAC/B,aAAO;AAAA,IACT;AAEA,QAAI,KAAK,eAAe;AACtB,aAAO;AAAA,IACT;AAEA,QAAI;AAEF,YAAM,YAAY,MAAM,UAAU,MAAM;AAAA,QACtC,KAAK;AAAA,QACL;AAAA,UACE,MAAM;AAAA,UACN,aAAa;AAAA,QAAA;AAAA,QAEf,CAAC,SAAS;AACR,iBAAO,SAAS;AAAA,QAClB;AAAA,MAAA;AAGF,UAAI,CAAC,WAAW;AACd,eAAO;AAAA,MACT;AAMA,WAAK,gBAAgB;AAGrB,gBAAU,MAAM;AAAA,QACd,KAAK;AAAA,QACL;AAAA,UACE,MAAM;AAAA,QAAA;AAAA,QAER,OAAO,SAAS;AACd,cAAI,MAAM;AACR,iBAAK,uBAAuB,IAAI;AAEhC,mBAAO,IAAI,QAAc,CAAC,YAAY;AACpC,mBAAK,cAAc,MAAM;AACvB,qBAAK,uBAAuB,KAAK;AACjC,wBAAA;AAAA,cACF;AAAA,YACF,CAAC;AAAA,UACH;AAAA,QACF;AAAA,MAAA;AAGF,aAAO;AAAA,IACT,SAAS,OAAO;AACd,UAAI,iBAAiB,SAAS,MAAM,SAAS,cAAc;AACzD,eAAO;AAAA,MACT;AACA,cAAQ,KAAK,wCAAwC,KAAK;AAC1D,aAAO;AAAA,IACT;AAAA,EACF;AAAA,EAEA,oBAA0B;AACxB,QAAI,KAAK,aAAa;AACpB,WAAK,YAAA;AACL,WAAK,cAAc;AAAA,IACrB;AAAA,EACF;AAAA,EAEQ,sBAA+B;AACrC,WAAO,OAAO,cAAc,eAAe,WAAW;AAAA,EACxD;AAAA,EAEA,OAAO,cAAuB;AAC5B,WAAO,OAAO,cAAc,eAAe,WAAW;AAAA,EACxD;AACF;;"}