canary-log-viewer/clv.ts

import { readLines } from "https://deno.land/std@0.83.0/io/mod.ts";

interface LogEntry {
  log: string;
  stream: "stdout";
  time: Date;
}

const encoder = new TextEncoder();

const filenames = Deno.args;
for (const filename of filenames) {
  const file = await Deno.open(filename);
  for await (const line of readLines(file)) {
    if (line) {
      const parsedLine = JSON.parse(
        line,
        (key, value) => key === "time" ? new Date(value) : value,
      ) as LogEntry;
      await Deno.stdout.write(
        encoder.encode(`${parsedLine.time.toISOString()} ${parsedLine.log}`),
      );
    }
  }
  file.close();
}