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* Tries to acquire a distributed lock for `ttl` seconds.\n * - the `id` defaults to `val_town-userHandle-valName` of the calling val\n * - (currently) rejects ids longer then 128 chars\n * - the `ttl` defauls to 3 sec\n * - rejects ttl that are not safe integers or are <= 0\n * @see https://dlock.univalent.net/\n * be aware that the `deadline` is in seconds, not the usual millisecond\n * and that it is floored, so it is very liely up to a second shorter then the ttl\n * @see https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html\n */\nexport async function dlock({ id, ttl = 3 }: {\n // lock id by default it is based on the name of the parent\n id?: string;\n // seconds\n ttl?: number;\n} = {}, _fetch = fetch): Promise {\n if (!id) {\n id = @karfau.mainReference(({ userHandle, valName }) =>\n `val_town-${userHandle}-${valName}`\n );\n }\n // https://github.com/losfair/dlock/blob/5f042396e4a42b7fcd384d188c9a3a81e973eaaa/src/index.ts#L19\n if (id.length > 128) {\n return Promise.reject(\n new RangeError(\n `id needs to be max 128 characters but was ${id.length}(${id})`,\n ),\n );\n // IDEA: (always) do a SHA512 hash from the composed or passed id, to avoid this problem\n }\n // https:github.com/losfair/dlock/blob/5f042396e4a42b7fcd384d188c9a3a81e973eaaa/src/index.ts#L53\n if (!Number.isSafeInteger(ttl) || ttl <= 0) {\n throw new RangeError(\"ttl has to be a safe integer above 0 but was \" + ttl);\n }\n const throttleMs = ttl * 251;\n let _lease = undefined;\n let _deadline;\n // https://github.com/losfair/dlock/blob/5f042396e4a42b7fcd384d188c9a3a81e973eaaa/src/index.ts#L48\n const isExpired = (): boolean => _deadline < (Date.now() / 1000);\n const release = async () =>\n !isExpired() &&\n void _fetch(\n `https://dlock.univalent.net/lock/${id}/release?${\n @stevekrouse.searchParams({ lease: _lease })\n }`,\n ).catch(console.error);\n const refresh = async () => {\n if (isExpired()) {\n throw new Error(\"lock is expired\");\n }\n return _fetch(\n `https://dlock.univalent.net/lock/${id}/aquire?${\n @stevekrouse.searchParams({ lease: _lease, ttl })\n }`,\n ).then(async (res) => {\n const data = await res.json();\n if (!res.ok) {\n throw new Error(data.error || res.status + \" \" + res.statusText);\n }\n _deadline = data.deadline;\n return _deadline;\n });\n };\n const acquire = async (max = Date.now() + ttl * 1000): Promise => {\n try {\n const lockRes = await _fetch(\n `https://dlock.univalent.net/lock/${id}/aquire?${\n @stevekrouse.searchParams({ lease: _lease, ttl })\n }`,\n );\n const { lease, error, deadline } = @karfau.debug(\n await lockRes.json(),\n id,\n );\n if (error && deadline) {\n const deadlineMs = deadline * 1000;\n if (deadlineMs >= max) {\n throw new Error(error + \" (and deadline > max)\");\n }\n else {\n let waitTime = deadlineMs - Date.now() + 1;\n if (waitTime <= 0) {\n waitTime = throttleMs;\n }\n await @stevekrouse.sleep(waitTime);\n return acquire(max);\n }\n }\n else if (!lockRes.ok || error) {\n throw new Error(error || lockRes.status + \" \" + lockRes.statusText);\n }\n else if (lease && deadline) {\n _lease = lease;\n _deadline = deadline;\n return { id, lease, deadline, isExpired, refresh, release };\n }\n else {\n const message = `Unexpected response from API: ${\n JSON.stringify({ lease, error, deadline })\n }`;\n console.error(message);\n throw new Error(message);\n }\n }\n catch (error) {\n if (Date.now() >= max) {\n throw error;\n }\n else {\n // the code might reach here in \"no time\",\n // in case _fetch threw an error synchronously (e.g. network error)\n // so we debounce to a max of 5 attempts (ttl * 1000 is the max time for retries)\n await @stevekrouse.sleep(throttleMs);\n return acquire(max);\n }\n }\n };\n return acquire();\n}\ntype Lock = {\n id: string;\n lease: number;\n deadline: number;\n isExpired: () => boolean;\n refresh: () => Promise;\n release: () => Promise;\n};\n// Forked from @stevekrouse.dlock","/**\n * Tries to acquire a distributed lock for `ttl` seconds.\n * - the `id` defaults to `val_town-userHandle-valName` of the calling val\n * - (currently) rejects ids longer then 128 chars\n * - the `ttl` defauls to 3 sec\n * - rejects ttl that are not safe integers or are <= 0\n * @see https://dlock.univalent.net/\n * be aware that the `deadline` is in seconds, not the usual millisecond\n * and that it is floored, so it is very liely up to a second shorter then the ttl\n * @see https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html\n */\nexport async function dlock({ id, ttl = 3 }: {\n // lock id by default it is based on the name of the parent\n id?: string;\n // seconds\n ttl?: number;\n} = {}, _fetch = fetch): Promise {\n if (!id) {\n id = @karfau.mainReference(({ userHandle, valName }) =>\n `val_town-${userHandle}-${valName}`\n );\n }\n // https://github.com/losfair/dlock/blob/5f042396e4a42b7fcd384d188c9a3a81e973eaaa/src/index.ts#L19\n if (id.length > 128) {\n return Promise.reject(\n new RangeError(\n `id needs to be max 128 characters but was ${id.length}(${id})`,\n ),\n );\n // IDEA: (always) do a SHA512 hash from the composed or passed id, to avoid this problem\n // https://examples.deno.land/hashing (needs imports from deno.land to provide types)\n }\n // https:github.com/losfair/dlock/blob/5f042396e4a42b7fcd384d188c9a3a81e973eaaa/src/index.ts#L53\n if (!Number.isSafeInteger(ttl) || ttl <= 0) {\n throw new RangeError(\"ttl has to be a safe integer above 0 but was \" + ttl);\n }\n const throttleMs = ttl * 251;\n let _lease = undefined;\n let _deadline;\n // https://github.com/losfair/dlock/blob/5f042396e4a42b7fcd384d188c9a3a81e973eaaa/src/index.ts#L48\n const isExpired = (): boolean => _deadline < (Date.now() / 1000);\n const release = async () =>\n !isExpired() &&\n void _fetch(\n `https://dlock.univalent.net/lock/${id}/release?${\n @stevekrouse.searchParams({ lease: _lease })\n }`,\n ).catch(console.error);\n const refresh = async () => {\n if (isExpired()) {\n throw new Error(\"lock is expired\");\n }\n return _fetch(\n `https://dlock.univalent.net/lock/${id}/aquire?${\n @stevekrouse.searchParams({ lease: _lease, ttl })\n }`,\n ).then(async (res) => {\n const data = await res.json();\n if (!res.ok) {\n throw new Error(data.error || res.status + \" \" + res.statusText);\n }\n _deadline = data.deadline;\n return _deadline;\n });\n };\n const acquire = async (max = Date.now() + ttl * 1000): Promise => {\n try {\n const lockRes = await _fetch(\n `https://dlock.univalent.net/lock/${id}/aquire?${\n @stevekrouse.searchParams({ lease: _lease, ttl })\n }`,\n );\n const { lease, error, deadline } = @karfau.debug(\n await lockRes.json(),\n id,\n );\n if (error && deadline) {\n const deadlineMs = deadline * 1000;\n if (deadlineMs >= max) {\n throw new Error(error + \" (and deadline > max)\");\n }\n else {\n let waitTime = deadlineMs - Date.now() + 1;\n if (waitTime <= 0) {\n waitTime = throttleMs;\n }\n await @stevekrouse.sleep(waitTime);\n return acquire(max);\n }\n }\n else if 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Diff · v23