container.ts/modules/metric/StatsdMetric.js

Modular application framework

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/// <reference types="node" />
const assert = require("assert");
const container_1 = require("../../container");
const Metric_1 = require("./Metric");
// Package statsd-client types are out of date.
const STATSD = require("statsd-client");
// TODO: Validation library.
exports.ENV_STATSD_HOST = "STATSD_HOST";
exports.ENV_STATSD_PORT = "STATSD_PORT";
class StatsdMetric extends Metric_1.Metric {
    constructor(name, opts) {
        super(name, opts);
        // Get host and port environment values.
        const host = this.environment.get(exports.ENV_STATSD_HOST);
        const port = this.environment.get(exports.ENV_STATSD_PORT) || "8125";
        assert(host != null, "StatsD host is undefined");
        assert(port != null, "StatsD port is undefined");
        this.debug(`host:port '${host}:${port}'`);
        // Create statsd client instance.
        // TODO: Handle more client options.
        this._statsd = new STATSD({ host, port });
    }
    /** StatsD handler for incoming metric messages. */
    handleMetric(metric) {
        // Map type to statsd methods.
        switch (metric.type) {
            case container_1.EMetricType.Increment: {
                this._statsd.increment(metric.name, metric.value, metric.tags);
                break;
            }
            case container_1.EMetricType.Decrement: {
                this._statsd.decrement(metric.name, metric.value, metric.tags);
                break;
            }
            case container_1.EMetricType.Gauge: {
                this._statsd.gauge(metric.name, metric.value, metric.tags);
                break;
            }
            case container_1.EMetricType.Timing: {
                this._statsd.timing(metric.name, metric.value, metric.tags);
                break;
            }
            case container_1.EMetricType.Histogram: {
                this._statsd.histogram(metric.name, metric.value, metric.tags);
                break;
            }
        }
    }
}
exports.StatsdMetric = StatsdMetric;
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