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| import {logger, MSG_FMT} from '../internal/log';
import {joinFqn} from '../util';
export type RetryOptions = {
name?: string;
maxAttempts: number;
interval?: number | number[];
backoff?: number | number[];
};
export class RetriesExceeded extends Error {
readonly lastErr: Error;
readonly retryOptions: RetryOptions;
constructor(message: string, lastErr: Error, retryOptions: RetryOptions) {
super(message);
this.lastErr = lastErr;
this.retryOptions = retryOptions;
}
}
function shift(val?: number | number[]): number | undefined {
let result: number | undefined;
Iif (val instanceof Array) {
result = val.shift();
}
else {
result = val;
}
return result;
}
// Extending Promise doesn't seem possible, runtime errors...
//
// TypeError: undefined is not a promise
// at Trying.Promise (<anonymous>)
// at new Trying (src/errors/retry.ts:42:5)
// @ts-ignore
// eslint-disable-next-line @typescript-eslint/no-unused-vars
class Trying<T> extends Promise<T> {
constructor(
fn: (...args: unknown[]) => Promise<T>,
readonly options: RetryOptions,
readonly thisArg?: Record<string, any>,
readonly args?: unknown[],
) {
super((resolve, reject) => {
const name = options.name || fn.name;
const log = logger(name);// log;
let lastInterval: number;
let counter = 0;
function run(): void {
++counter;
let promise: Promise<T>;
if (args) {
promise = fn.apply(thisArg, args);
}
else {
promise = fn.apply(thisArg);
}
promise.then(result => {
log.debug('Resolved after %d retry attempts.', counter);
resolve(result);
}).catch(error => {
if (counter < options.maxAttempts) {
const wait = shift(options.interval);
const backoff = shift(options.backoff) || 0;
const interval = wait
? wait * backoff + wait
: lastInterval;
lastInterval = interval;
log.debug(
'Error calling %o(). Attempt %d/%d, waiting %dms (interval:%d, backoff:%d)',
fn,
counter,
options.maxAttempts,
interval,
wait,
backoff,
error,
);
setTimeout(() => {
run()
}, interval);
}
else {
log.warn('Max retry attempts (%d) reached for %o()', options.maxAttempts, fn, error);
reject(new RetriesExceeded(
`Retry ${name} attempted ${options.maxAttempts} times without success!`,
error,
options,
));
}
});
}
run();
});
}
}
export async function retry(
fn: () => Promise<unknown>,
options: RetryOptions,
): Promise<unknown> {
// eslint-disable-next-line sonarjs/no-identical-functions
function trying(resolve, reject) {
const name = options.name || fn.name;
const log = logger(name);// log;
let lastInterval: number;
let counter = 0;
// eslint-disable-next-line sonarjs/no-identical-functions
function run(): void {
++counter;
const promise: Promise<unknown> = fn();
promise.then(result => {
log.debug('Resolved after %d retry attempts.', counter);
resolve(result);
// eslint-disable-next-line sonarjs/no-identical-functions
}).catch(error => {
if (counter < options.maxAttempts) {
const wait = shift(options.interval);
const backoff = shift(options.backoff) || 0;
const interval = wait
? wait * backoff + wait
: lastInterval;
lastInterval = interval;
log.debug(
'Error calling %o(). Attempt %d/%d, waiting %dms (interval:%d, backoff:%d)',
fn,
counter,
options.maxAttempts,
interval,
wait,
backoff,
error,
);
setTimeout(() => {
run()
}, interval);
}
else {
log.warn('Max retry attempts (%d) reached for %o()', options.maxAttempts, fn, error);
const err = new RetriesExceeded(
`Retry [${name}] attempted "${options.maxAttempts}" times without success!`,
error,
options,
);
reject(err);
}
});
}
run();
}
return new Promise(trying/*, options, thisArg, args*/);
}
export function Retry(options: RetryOptions): MethodDecorator {
return function retryDecorator(
target: Record<string, any>,
prop: PropertyKey,
desc: PropertyDescriptor,
): PropertyDescriptor {
const original = desc.value;
const name = options.name || joinFqn(prop, target.constructor.name);
const log = logger('@Retry');
log.debug(MSG_FMT.annotatingMethod, target.constructor.name, prop, 'Retry', options);
console.dir(desc);
desc.value = function runWithRetry(...args: unknown[]): Promise<unknown> {
console.dir(desc);
console.dir(this, {getters:true, showHidden:true,depth:5,colors:true});
console.dir(target);
const promise: Promise<unknown> = retry(
() => original.apply(this, args),
{ name, ...options },
);
console.assert(promise instanceof Promise, `Not a Promise! ${promise.constructor.name}`);
return promise/*.then(val => console.log('SUCCESS: result value %o'))
.catch(err => console.error('ERRRRRRR: ', err))*/;
};
return desc;
}
}
|