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{ sleep } from \"https://deno.land/x/sleep/mod.ts\";\nimport { fetchJSON } from \"https://esm.town/v/stevekrouse/fetchJSON\";\nimport { parentReference } from \"https://esm.town/v/stevekrouse/parentReference\";\nimport { searchParams } from \"https://esm.town/v/stevekrouse/searchParams\";\n\nexport type LockHandle = {\n opts: LockOptions | undefined;\n release: () => Promise;\n released: Promise;\n};\n\nexport async function acquireLock(opts?: LockOptions): Promise {\n let id = opts?.id ?? parentReference().userHandle + \"-\" + parentReference().valName;\n id = id.replace(/[^\\w]+/g, \"_\");\n const ttl = opts?.ttl ?? 3;\n\n async function handleError(error: string) {\n if (typeof opts?.retries === \"number\" && (opts.retry ?? 0) >= opts.retries) {\n throw new LockError(`LockError: failed with message \"${error || \"unknown error\"}\"`);\n }\n\n await sleep((opts?.retryTimeout ?? 1000) / 1000);\n return acquireLock({\n ...opts,\n id,\n ttl,\n retry: (opts?.retry ?? 0) + 1,\n });\n }\n\n const res = await makeRequest(id, \"acquire\", {\n ttl,\n });\n const { lease } = res;\n\n if (!lease) {\n return handleError(res.error);\n }\n\n const acquired = await makeRequest(id, \"acquire\", {\n ttl,\n lease,\n });\n if (!acquired.lease) {\n return handleError(res.error);\n }\n console.log(\"acquired lock\", id);\n\n let releasedRequest: Promise;\n const {\n promise: released,\n resolve,\n } = Promise.withResolvers();\n released.then(() => {\n console.log(\"released lock\", id);\n });\n async function release(): Promise {\n releasedRequest ??= makeRequest(id, \"release\", {\n lease,\n }).then(resolve);\n return releasedRequest;\n }\n\n return {\n opts,\n release,\n released,\n [Symbol.dispose]: release,\n };\n}\n\nexport class LockError extends Error {}\n\nexport type LockOptions = {\n id?: string;\n ttl?: number;\n retry?: number;\n retries?: number;\n retryTimeout?: number;\n};\n\nexport type LockResponse = {\n lease?: number;\n deadline: number;\n error?: \"string\";\n};\n\nexport async function makeRequest(id: string, method: \"release\" | \"acquire\", params): Promise {\n return fetchJSON(\n `https://dlock.univalent.net/lock/${id}/${method}?${searchParams(params)}`,\n );\n}\n\nexport function createMemoryLock() {\n let released = Promise.resolve(undefined);\n\n return async (): Promise => {\n const {\n promise,\n resolve: release,\n } = Promise.withResolvers();\n\n let previousReleased: Promise | undefined = undefined;\n while (previousReleased !== released) {\n previousReleased = released;\n await previousReleased;\n }\n released = promise;\n\n return {\n opts: undefined,\n async release() {\n release();\n await promise;\n return undefined;\n },\n released,\n [Symbol.dispose]: release,\n };\n };\n}","import { sleep } from \"https://deno.land/x/sleep/mod.ts\";\nimport { fetchJSON } from \"https://esm.town/v/stevekrouse/fetchJSON\";\nimport { parentReference } from \"https://esm.town/v/stevekrouse/parentReference\";\nimport { searchParams } from \"https://esm.town/v/stevekrouse/searchParams\";\n\nexport type LockHandle = {\n opts: LockOptions | undefined;\n release: () => Promise;\n released: Promise;\n};\n\nexport async function acquireLock(opts?: LockOptions): Promise {\n let id = opts?.id ?? parentReference().userHandle + \"-\" + parentReference().valName;\n id = id.replace(/[^\\w]+/g, \"_\");\n const ttl = opts?.ttl ?? 3;\n\n async function handleError(error: string) {\n if (typeof opts?.retries === \"number\" && (opts.retry ?? 0) >= opts.retries) {\n throw new LockError(`LockError: failed with message \"${error || \"unknown error\"}\"`);\n }\n\n await sleep((opts?.retryTimeout ?? 1000) / 1000);\n return acquireLock({\n ...opts,\n id,\n ttl,\n retry: (opts?.retry ?? 0) + 1,\n });\n }\n\n const res = await makeRequest(id, \"acquire\", {\n ttl,\n });\n const { lease } = res;\n\n if (!lease) {\n return handleError(res.error);\n }\n\n const acquired = await makeRequest(id, \"acquire\", {\n ttl,\n lease,\n });\n if (!acquired.lease) {\n return handleError(res.error);\n }\n console.log(\"acquired lock\", id);\n\n let releasedRequest: Promise;\n const {\n promise: released,\n resolve,\n } = Promise.withResolvers();\n released.then(() => {\n console.log(\"released lock\", id);\n });\n async function release(): Promise {\n releasedRequest ??= makeRequest(id, \"release\", {\n lease,\n }).then(resolve);\n return releasedRequest;\n }\n\n return {\n opts,\n release,\n released,\n [Symbol.dispose]: release,\n };\n}\n\nexport class LockError extends Error {}\n\nexport type LockOptions = {\n id?: string;\n ttl?: number;\n retry?: number;\n retries?: number;\n retryTimeout?: number;\n};\n\nexport type LockResponse = {\n lease?: number;\n deadline: number;\n error?: \"string\";\n};\n\nexport async function makeRequest(id: string, method: \"release\" | \"acquire\", params): Promise {\n return fetchJSON(\n `https://dlock.univalent.net/lock/${id}/${method}?${searchParams(params)}`,\n );\n}\n\nexport function createMemoryLock() {\n let released = Promise.resolve(undefined);\n\n return async (): Promise => {\n const {\n promise,\n resolve: release,\n } = Promise.withResolvers();\n\n let previousReleased: Promise | undefined = undefined;\n while (previousReleased !== released) {\n previousReleased = released;\n await previousReleased;\n }\n released = promise;\n console.log(\"memory lock acquired\");\n promise.then(() => {\n console.log(\"memory lock released\");\n });\n\n return {\n opts: undefined,\n async release() {\n release();\n await promise;\n return undefined;\n },\n released,\n [Symbol.dispose]: release,\n };\n 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lock: distributed lock\n\nForked from [@stevekrouse/dlock](../stevekrouse/dlock)! 🙏\n\n## Example:\n\n```ts\nimport { acquireLock } from \"https://esm.town/v/postpostscript/lock\";\n\nusing exampleLock = await acquireLock();\n// lock will be released when it goes out of context\n```\n\n[Full Example](lockExample)\n\n## Options:\n\n```ts\nusing exampleLock = await acquireLock({\n id: \"lockExample\",\n retries: 0,\n ttl: 5, // seconds\n retryTimeout: 1000, // ms\n});\n```\n\nMigrated from folder: 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Diff · v21