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Engelschall <rse@engelschall.com> ** ** Permission is hereby granted, free of charge, to any person obtaining ** a copy of this software and associated documentation files (the ** "Software"), to deal in the Software without restriction, including ** without limitation the rights to use, copy, modify, merge, publish, ** distribute, sublicense, and/or sell copies of the Software, and to ** permit persons to whom the Software is furnished to do so, subject to ** the following conditions: ** ** The above copyright notice and this permission notice shall be included ** in all copies or substantial portions of the Software. ** ** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, ** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF ** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. ** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY ** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, ** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE ** SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /* type of a single resource cleanup handler */ type SpoolCleanup<T = unknown> = (resource: T) => void | Promise<void> /* type of a single resource */ type SpoolResource<T = unknown> = { resource: T, cleanup: SpoolCleanup<T> } /* resource spooling class */ export class Spool { /* internal state */ private resources: SpoolResource<unknown>[] = [] /* roll cleanup procedure onto spool */ roll (cleanup: SpoolCleanup): void roll <T>(resource: T, cleanup: SpoolCleanup<T>): void roll (...args: any[]): void { /* determine parameters */ let resource: unknown let cleanup: SpoolCleanup<unknown> if (args.length === 1) { resource = undefined; cleanup = args[0] } else if (args.length === 2) { resource = args[0]; cleanup = args[1] } else throw new Error("invalid number of arguments") /* store information */ this.resources.push({ resource, cleanup }) } /* roll a sub-spool onto spool */ sub (): Spool { /* create new spool */ const spool = new Spool() /* roll sub-spool onto spool */ this.roll(spool, () => {}) /* return new spool */ return spool } /* unroll all cleanup procedures from spool */ unroll (suppress = true): Promise<void> | void { /* NOTICE: we operate synchronously until the first cleanup procedure returns a Promise. Then we continue asynchronously, regardless of whether the following cleanup procedures return a Promise or not! */ try { let promise: Promise<void> | undefined while (this.resources.length > 0) { const entry = this.resources.pop()! const resource = entry.resource const cleanup = entry.cleanup if (promise) { if (resource instanceof Spool) promise = promise.then(() => resource.unroll() /* RECURSION */) else promise = promise.then(() => cleanup(resource)) } else { let result: Promise<void> | void if (resource instanceof Spool) result = resource.unroll() /* RECURSION */ else result = cleanup(resource) if (result instanceof Promise) promise = result } } if (promise) return suppress ? promise.catch(() => {}) : promise else return } catch (error: unknown) { if (suppress) return throw error } } } /* helper function for retrieving an Error object */ export function ensureError (error: unknown, prefix?: string, debug = false): Error { if (error instanceof Error && prefix === undefined && debug === false) return error let msg = error instanceof Error ? error.message : String(error) if (prefix) msg = `${prefix}: ${msg}` if (debug && error instanceof Error) msg = `${msg}\n${error.stack}` if (error instanceof Error) { const err = new Error(msg, { cause: error }) err.stack = error.stack return err } else return new Error(msg) } /* helper function for running the finally code of "run" */ function runFinally (isAsync: false, onfinally?: () => void): void function runFinally (isAsync: true, onfinally?: () => Promise<void> | void): Promise<void> function runFinally (isAsync: boolean, onfinally?: () => Promise<void> | void): Promise<void> | void { if (!onfinally) { if (isAsync) return Promise.resolve() else return } let result: Promise<void> | void try { result = onfinally() } catch (error: unknown) { if (isAsync) return Promise.reject(error) else throw error } if (!isAsync && result instanceof Promise) throw new Error("onfinally callback returned Promise in non-async context") if (isAsync && !(result instanceof Promise)) result = Promise.resolve(result) return result } /* helper function for unrolling a spool */ function runUnroll (isAsync: false, spool?: Spool): void function runUnroll (isAsync: true, spool?: Spool): Promise<void> function runUnroll (isAsync: boolean, spool?: Spool): Promise<void> | void { if (!spool) { if (isAsync) return Promise.resolve() else return } let result = spool.unroll() if (!isAsync && result instanceof Promise) throw new Error("spool unroll returned Promise in non-async context") if (isAsync && !(result instanceof Promise)) result = Promise.resolve(result) return result } /* helper type for ensuring T contains no Promise */ type RunNoPromise<T> = [ T ] extends [ Promise<any> ] ? never : T /* run a synchronous or asynchronous action */ export function run<T, X extends RunNoPromise<T> | never> ( action: () => X, oncatch?: (error: Error) => X, onfinally?: () => void, oncleanup?: (value: T) => void ): X export function run<T, X extends RunNoPromise<T> | never> ( description: string, action: () => X, oncatch?: (error: Error) => X, onfinally?: () => void, oncleanup?: (value: T) => void ): X export function run<T, X extends Promise<T> | never> ( action: () => X, oncatch?: (error: Error) => X, onfinally?: () => Promise<void>, oncleanup?: (value: T) => Promise<void> ): X export function run<T, X extends Promise<T> | never> ( description: string, action: () => X, oncatch?: (error: Error) => X, onfinally?: () => Promise<void> | void, oncleanup?: (value: T) => Promise<void> | void ): X export function run<T, X extends RunNoPromise<T> | never> ( spool: Spool | undefined, action: () => X, oncatch?: (error: Error) => X, onfinally?: () => void, oncleanup?: (value: T) => void ): X export function run<T, X extends RunNoPromise<T> | never> ( description: string, spool: Spool | undefined, action: () => X, oncatch?: (error: Error) => X, onfinally?: () => void, oncleanup?: (value: T) => void ): X export function run<T, X extends Promise<T> | never> ( spool: Spool | undefined, action: () => X, oncatch?: (error: Error) => X, onfinally?: () => Promise<void>, oncleanup?: (value: T) => Promise<void> ): X export function run<T, X extends Promise<T> | never> ( description: string, spool: Spool | undefined, action: () => X, oncatch?: (error: Error) => X, onfinally?: () => Promise<void>, oncleanup?: (value: T) => Promise<void> ): X export function run<T, X extends RunNoPromise<T> | never> ( config: { description?: string, spool?: Spool | undefined, action: () => X, oncatch?: (error: Error) => X, onfinally?: () => void, oncleanup?: (value: T) => void } ): X export function run<T, X extends Promise<T>> ( config: { description?: string, spool?: Spool | undefined, action: () => X, oncatch?: (error: Error) => X, onfinally?: () => Promise<void>, oncleanup?: (value: T) => Promise<void> } ): X export function run<T> ( ...args: any[] ): T | Promise<T> | never { /* support overloaded signatures */ let description: string | undefined let spool: Spool | undefined let action: () => T | Promise<T> | never let oncatch: ((error: Error) => T | Promise<T> | never) | undefined let onfinally: (() => void) | undefined let oncleanup: ((value: T) => void) | undefined if (args.length === 1 && typeof args[0] === "object" && args[0] !== null) { description = args[0].description spool = args[0].spool action = args[0].action oncatch = args[0].oncatch onfinally = args[0].onfinally oncleanup = args[0].oncleanup } else if (typeof args[0] === "string") { description = args[0] if (args[1] instanceof Spool || (args[1] === undefined && typeof args[2] === "function")) { spool = args[1] action = args[2] oncatch = args[3] onfinally = args[4] oncleanup = args[5] } else { action = args[1] oncatch = args[2] onfinally = args[3] oncleanup = args[4] } } else { if (args[0] instanceof Spool || (args[0] === undefined && typeof args[1] === "function")) { spool = args[0] action = args[1] oncatch = args[2] onfinally = args[3] oncleanup = args[4] } else { action = args[0] oncatch = args[1] onfinally = args[2] oncleanup = args[3] } } /* sanity check spool/oncleanup scenario */ if (oncleanup && !spool) throw new Error("oncleanup requires a spool") /* perform the action */ let result: T | Promise<T> try { result = action() } catch (arg: unknown) { /* synchronous case (error branch) */ let error = ensureError(arg, description) if (oncatch) { try { result = oncatch(error) } catch (arg: unknown) { error = ensureError(arg, description) runFinally(false, onfinally) runUnroll(false, spool) throw error } runFinally(false, onfinally) return result } runFinally(false, onfinally) runUnroll(false, spool) throw error } if (result instanceof Promise) { /* asynchronous case (result or error branch) */ return result.then(async (result) => { await runFinally(true, onfinally) if (spool && oncleanup) spool.roll(result, oncleanup as SpoolCleanup<unknown>) return result }, async (arg: unknown) => { /* asynchronous case (error branch) */ let error = ensureError(arg, description) if (oncatch) { try { const result = oncatch(error) await runFinally(true, onfinally) return result } catch (arg: unknown) { error = ensureError(arg, description) await runFinally(true, onfinally) await runUnroll(true, spool) throw error } } await runFinally(true, onfinally) await runUnroll(true, spool) throw error }) } else { /* synchronous case (result branch) */ runFinally(false, onfinally) if (spool && oncleanup) spool.roll(result, oncleanup as SpoolCleanup<unknown>) return result } } |