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* Tries to acquire a lock for `ttl` seconds.\n * - (currently) rejects ids longer then 128 chars\n * - rejects ttl that are not safe integers or are <= 0\nexport async function dlock({ id, ttl = 3, release, lease }: {\n // lock id by default it is based on the name of the parent\n id?: string;\n // seconds\n ttl?: number;\n release?: boolean;\n lease?: number;\n} = {}): Promise {\n if (!id) {\n const {userHandle, valName} = @stevekrouse.parentReference();\n id = `val_town-${userHandle}-${valName}`;\n }\n // https://github.com/losfair/dlock/blob/5f042396e4a42b7fcd384d188c9a3a81e973eaaa/src/index.ts#L19\n if (id.length > 128) {\n throw new RangeError(`id needs to be max 128 characters but was ${id.length}(${id})`);\n // IDEA: (always) do a SHA512 hash from the composed 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 let currentLease = undefined;\n const release = async () => currentLease && void @stevekrouse.fetchJSON(\n `https://dlock.univalent.net/lock/${id}/release?${\n @stevekrouse.searchParams({ lease: currentLease })\n }`,\n ).catch(console.error);\n const refresh = async () => currentLease && void @stevekrouse.fetchJSON(\n `https://dlock.univalent.net/lock/${id}/release?${\n @stevekrouse.searchParams({ lease: currentLease })\n }`,\n ).then();\n const acquire = async (max = Date.now() + ttl * 1000) => {\n return new Promise((resolve, reject) => {\n try {\n const {lease, error, deadline} = await @stevekrouse.fetchJSON(\n `https://dlock.univalent.net/lock/${id}/aquire?${\n @stevekrouse.searchParams({ ttl, lease })\n }`,\n );\n if (error && deadline) {\n if (deadline >= max) {\n reject(new Error(error + ' (and deadline > max)'));\n } else {\n resolve(@stevekrouse.sleep(deadline-Date.now()).then(() => acquire(max)));\n }\n } else if (error) {\n throw new Error(error);\n } else { \n resolve({lease, deadline});\n }\n } catch (error) {\n if (Date.now() >= max) {\n reject(error);\n } else {\n resolve(acquire(max));\n }\n }\n });\n };\n \n return acquire().then(lock => ({...lock, refresh, release}));\n}\n\ntype Lock = {\n lease: number;\n deadline: number;\n refresh: () => Promise;\n release: () => Promise;\n}\n// Forked from @stevekrouse.dlock","/**\n * Tries to acquire a lock for `ttl` seconds.\n * - (currently) rejects ids longer then 128 chars\n * - rejects ttl that are not safe integers or are <= 0\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} = {}): Promise {\n if (!id) {\n const { userHandle, valName } = @stevekrouse.parentReference();\n id = `val_town-${userHandle}-${valName}`;\n }\n // https://github.com/losfair/dlock/blob/5f042396e4a42b7fcd384d188c9a3a81e973eaaa/src/index.ts#L19\n if (id.length > 128) {\n throw new RangeError(\n `id needs to be max 128 characters but was ${id.length}(${id})`,\n );\n // IDEA: (always) do a SHA512 hash from the composed id, to avoid this problem\n }\n https:\n //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 let _lease = undefined;\n let _deadline;\n const release = async () =>\n _lease &&\n void @stevekrouse.fetchJSON(\n `https://dlock.univalent.net/lock/${id}/release?${\n @stevekrouse.searchParams({ lease: _lease })\n }`,\n ).catch(console.error);\n const refresh = async () =>\n _lease &&\n void @stevekrouse.fetchJSON(\n `https://dlock.univalent.net/lock/${id}/release?${\n @stevekrouse.searchParams({ lease: _lease, ttl })\n }`,\n ).then();\n const acquire = async (max = Date.now() + ttl * 1000) => {\n return new Promise>((resolve, reject) => {\n try {\n const { lease, error, deadline } = await @stevekrouse\n .fetchJSON(\n `https://dlock.univalent.net/lock/${id}/aquire?${\n @stevekrouse.searchParams({ lease: _lease, ttl })\n }`,\n );\n if (error && deadline) {\n if (deadline >= max) {\n reject(new Error(error + \" (and deadline > max)\"));\n }\n else {\n resolve(\n @stevekrouse.sleep(deadline - Date.now()).then(() =>\n acquire(max)\n ),\n );\n }\n }\n else if (error) {\n throw new Error(error);\n }\n else if (lease && deadline) {\n _lease = lease;\n _deadline = deadline;\n resolve({ lease, deadline });\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 reject(error);\n }\n else {\n resolve(acquire(max));\n }\n }\n });\n };\n return acquire().then((lock) => ({ ...lock, refresh, release }));\n}\ntype Lock = {\n lease: number;\n deadline: number;\n refresh: () => Promise;\n release: () => 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Diff · v3