@loopback/metrics/dist/metrics.component.js

An extension exposes metrics for Prometheus with LoopBack 4

"use strict";
// Copyright IBM Corp. and LoopBack contributors 2019. All Rights Reserved.
// Node module: @loopback/metrics
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT
Object.defineProperty(exports, "__esModule", { value: true });
exports.MetricsComponent = void 0;
const tslib_1 = require("tslib");
const core_1 = require("@loopback/core");
const prom_client_1 = require("prom-client");
const controllers_1 = require("./controllers");
const interceptors_1 = require("./interceptors");
const keys_1 = require("./keys");
const observers_1 = require("./observers");
const types_1 = require("./types");
/**
 * A component providing metrics for Prometheus
 */
let MetricsComponent = class MetricsComponent {
    constructor(application, metricsConfig = {}) {
        this.application = application;
        const options = {
            ...types_1.DEFAULT_METRICS_OPTIONS,
            ...metricsConfig,
        };
        if (options.defaultMetrics && !options.defaultMetrics.disabled) {
            this.application.lifeCycleObserver(observers_1.MetricsObserver);
        }
        if (options.pushGateway && !options.pushGateway.disabled) {
            this.application.lifeCycleObserver(observers_1.MetricsPushObserver);
        }
        this.application.add((0, core_1.createBindingFromClass)(interceptors_1.MetricsInterceptor));
        if (options.endpoint && !options.endpoint.disabled) {
            this.application.controller((0, controllers_1.metricsControllerFactory)(options));
        }
        if (options.defaultLabels) {
            prom_client_1.register.setDefaultLabels(options.defaultLabels);
        }
    }
};
exports.MetricsComponent = MetricsComponent;
exports.MetricsComponent = MetricsComponent = tslib_1.__decorate([
    (0, core_1.injectable)({ tags: { [core_1.ContextTags.KEY]: keys_1.MetricsBindings.COMPONENT } }),
    tslib_1.__param(0, (0, core_1.inject)(core_1.CoreBindings.APPLICATION_INSTANCE)),
    tslib_1.__param(1, (0, core_1.config)()),
    tslib_1.__metadata("design:paramtypes", [core_1.Application, Object])
], MetricsComponent);
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