elasticsearch/ts/elasticlog.classes.elasticlog.ts

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export type Environment = "local" | "test" | "staging" | "production";
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// interfaces
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import { Client as ElasticClient } from "elasticsearch";
// other classes
import { LogScheduler } from "./elasticlog.classes.logscheduler";
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export interface LogContext {
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zone?: string;
containerName?: string;
environment: Environment;
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}
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export type TLogSeverity = "log" | "info" | "warn" | "error" | "fatal";
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export interface IStandardLogParams {
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message: string;
severity: string;
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}
export interface IElasticLogConstructorOptions {
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port: number;
domain: string;
ssl: boolean;
user?: string;
pass?: string;
logContext: LogContext;
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}
export class ElasticLog<T> {
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client: ElasticClient;
logContext: LogContext;
logScheduler = new LogScheduler(this);
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/**
* sets up an instance of Elastic log
* @param optionsArg
*/
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constructor(optionsArg: IElasticLogConstructorOptions) {
this.logContext = optionsArg.logContext;
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this.client = new ElasticClient({
host: this.computeHostString(optionsArg),
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log: "trace"
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});
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}
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/**
* computes the host string from the constructor options
* @param optionsArg
*/
private computeHostString(optionsArg: IElasticLogConstructorOptions): string {
let hostString = `${optionsArg.domain}:${optionsArg.port}`;
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if (optionsArg.user && optionsArg.pass) {
hostString = `${optionsArg.user}:${optionsArg.pass}@${hostString}`;
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}
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if (optionsArg.ssl) {
hostString = `https://${hostString}`;
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} else {
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hostString = `http://${hostString}`;
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}
return hostString;
}
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async log(logObject: IStandardLogParams, scheduleOverwrite = false) {
const now = new Date();
if (this.logScheduler.logsScheduled && !scheduleOverwrite) {
this.logScheduler.scheduleLog(logObject);
return;
}
this.client.index(
{
index: `logs-${now.getFullYear()}.${("0" + (now.getMonth() + 1)).slice(
-2
)}.${now.getDate()}`,
type: "log",
body: {
"@timestamp": now.toISOString(),
container: this.logContext.containerName,
environment: this.logContext.environment,
severity: logObject.severity,
message: logObject.message
}
},
(error, response) => {
if (error) {
console.log("ElasticLog encountered an error:");
console.log(error);
this.logScheduler.addFailedLog(logObject);
} else {
console.log(`ElasticLog: ${logObject.message}`);
}
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}
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);
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}
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}