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| import {accept, Filter} from '../decorators';
import {Lookup} from '../decorators/lookup';
import {internal} from '../internal';
import {Providers} from '../providers';
import {Numeric} from '../types';
import {joinFqn, Tags} from '../util';
import {Metric} from './local/metric';
const { logger, MSG_FMT } = internal;
export type Counter<T extends Numeric> = Metric & {
increment: (val: T, tags?: Tags) => void;
}
export abstract class CounterFactory<T extends Numeric> {
abstract counter(name: string, tags?: Tags): Counter<T>;
}
export type CountOptions<T extends Numeric> = {
name?: string;
filter?: Filter;
counterFactory?: CounterFactory<T>;
tags?: Tags;
};
export function CountInvocations(options: CountOptions<number> = {}): MethodDecorator {
return function countInvocationsDecorator(
target: Record<string, any>,
prop: PropertyKey,
desc: PropertyDescriptor,
): PropertyDescriptor {
const original = desc.value;
const fqn = options.name || joinFqn(prop, target.constructor.name);
const log = logger('@CountInvocations');
log.debug(MSG_FMT.annotatingMethod, target.constructor.name, prop, 'CountInvocations', options);
const counters = new Lookup<CounterFactory<number>, Counter<number>>(() => Providers.provide(CounterFactory));
desc.value = function countInvocation(...args: unknown[]): unknown {
if (accept(options)) {
const metric = counters.getInstance(
this,
fqn,
() => counters.getFactory(this, fqn, options.counterFactory)?.counter(fqn, options.tags),
);
Iif (!metric) {
log.warn(
'Unable to decorate %s.%s with @CountInvocations! No CounterFactory available!',
target.constructor.name,
prop,
);
}
metric?.increment(1);
}
return original.apply(this, ...args);
};
return desc;
}
}
export function CountSuccess(options: CountOptions<number> = {}): MethodDecorator {
return function countSuccessDecorator(
target: Record<string, any>,
prop: PropertyKey,
desc: PropertyDescriptor,
): PropertyDescriptor {
const original = desc.value;
const fqn = options?.name || joinFqn(prop, target.constructor.name);
const log = logger('@CountSuccess');
log.debug(MSG_FMT.annotatingMethod, target.constructor.name, prop, 'CountSuccess', options);
const counters = new Lookup<CounterFactory<number>, Counter<number>>(() => Providers.provide(CounterFactory));
desc.value = function countSuccess(...args: unknown[]): unknown {
const result = original.apply(this, ...args);
Eif (accept(options)) {
const metric = counters.getInstance(
this,
fqn,
() => counters.getFactory(this, fqn, options?.counterFactory)?.counter(fqn, options?.tags),
);
Iif (!metric) {
log.warn(
'Unable to decorate %s.%s with @CountSuccess! No CounterFactory available!',
target.constructor.name,
prop,
);
}
if (result instanceof Promise) {
result.then(() => metric?.increment(1));
}
else {
metric?.increment(1);
}
}
return result;
};
return desc;
}
}
export function CountErrors(options: CountOptions<number> = {}): MethodDecorator {
return function countErrorsDecorator(
target: Record<string, any>,
prop: PropertyKey,
desc: PropertyDescriptor,
): PropertyDescriptor {
const original = desc.value;
const fqn = options.name || joinFqn(prop, target.constructor.name);
const log = logger('@CountErrors');
log.debug(MSG_FMT.annotatingMethod, target.constructor.name, prop, 'CountErrors', options);
const counters = new Lookup<CounterFactory<number>, Counter<number>>(() => Providers.provide(CounterFactory));
desc.value = function countErrors(...args: unknown[]): unknown {
// eslint-disable-next-line @typescript-eslint/no-this-alias
const caller = this;
function countErr(err, promise = false): void {
const metric = counters.getInstance(
caller,
fqn,
() => counters.getFactory(caller, fqn, options.counterFactory)?.counter(fqn, options.tags),
);
Iif (!metric) {
log.warn(
'Unable to decorate %s.%s with @CountErrors! No CounterFactory available!',
target.constructor.name,
prop,
);
}
Eif (metric && accept(options)) {
metric.increment(1);
}
if (!promise) {
throw err;
}
}
let result: unknown;
try {
result = original.apply(this, ...args);
if (result instanceof Promise) {
result.catch(err => countErr(err, true));
}
}
catch (error) {
countErr(error);
}
return result;
};
return desc;
}
}
|