Grafana Loki - Post Logs with Fetch

// This is a deno script. To run it: $ deno run --allow-all post-grafana.ts

import * as base64 from "https://deno.land/std@0.207.0/encoding/base64.ts";

const lokiUrl = "https://your.loki.server/loki/api/v1/push";
const lokiBasicAuth = {
  username: "user",
  password: "pass",
};
const server = "frontend.staging"; //your server name
const debugLogFetches = false; //just to debug this script

async function log(message: string, level: "info" | "warn" | "error") {
  const epoch_ns = Date.now() * 1000000;

  const data = {
    streams: [
      {
        stream: {
          label: `${server}.${level}`,
        },
        values: [[epoch_ns.toString(), message]],
      },
    ],
  };

  try {
    const response = await fetch(lokiUrl, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        Authorization:
          "Basic " +
          base64.encode(lokiBasicAuth.username + ":" + lokiBasicAuth.password),
      },
      body: JSON.stringify(data),
    });

    const result = await response.text();
    if (debugLogFetches) {
      console.log(response);
      console.log("Success:", result);
    }
  } catch (error) {
    if (debugLogFetches) {
      console.error("Error:", error);
    }
  }
}

export const Log = {
  i: (message: string) => log(message, "info"),
  w: (message: string) => log(message, "warn"),
  e: (message: string) => log(message, "error"),
};

Log.w(JSON.stringify("basic auth ok!"));