parking_solution/apps/server/src/log-service-stream.test.ts

import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { appLogs, type Db } from "@parking/db";
import { createTestDb } from "@parking/db/testing";
import { LogService, pinoDbStream } from "./log-service.js";

// pinoDbStream feeds backend warn+ lines into app_logs. Since 2026-07-04 the logger
// emits level NAMES ("warn") instead of pino's numeric codes (40) — for human-readable
// container logs — and the stream must accept BOTH encodings (numeric covers any
// default-configured pino). A level the tee can't resolve falls back to info → not
// persisted, never a crash.

let db: Db;
let stream: { write: (line: string) => void };
let teed: string[];

beforeEach(() => {
  ({ db } = createTestDb());
  teed = [];
  stream = pinoDbStream(new LogService(db), {
    write: (line: string) => {
      teed.push(line);
      return true;
    },
  } as unknown as NodeJS.WritableStream);
});

const rows = () => db.select().from(appLogs).all();

describe("pinoDbStream level encodings", () => {
  it("persists a LABEL-level warn line (the current logger format)", () => {
    stream.write(`{"level":"warn","time":"2026-07-04T18:14:11.453Z","msg":"label warn"}\n`);
    expect(rows()).toHaveLength(1);
    expect(rows()[0]).toMatchObject({ level: "warn", source: "backend", message: "label warn" });
  });

  it("still persists a NUMERIC-level error line (legacy/default pino)", () => {
    stream.write(`{"level":50,"time":1783179038453,"msg":"numeric error"}\n`);
    expect(rows()[0]).toMatchObject({ level: "error", message: "numeric error" });
  });

  it("info stays stdout-only in both encodings (teed, not persisted)", () => {
    stream.write(`{"level":"info","msg":"label info"}\n`);
    stream.write(`{"level":30,"msg":"numeric info"}\n`);
    expect(rows()).toHaveLength(0);
    expect(teed).toHaveLength(2); // stdout tee always happens
  });

  it("an unresolvable level falls back to info (dropped), never throws", () => {
    stream.write(`{"level":"loud","msg":"weird"}\n`);
    stream.write(`not json at all\n`);
    expect(rows()).toHaveLength(0);
    expect(teed).toHaveLength(2);
  });
});

// Storm coalescing: a line identical to the LAST persisted row (level+source+message+
// path), arriving within 5 min of its previous occurrence, UPDATES that row (bumping
// context._repeat) instead of inserting — one screaming device can't evict unrelated
// history. The row's createdAt tracks the LATEST occurrence; the first is preserved in
// context._firstAt.
describe("storm coalescing", () => {
  afterEach(() => {
    vi.useRealTimers();
  });

  it("folds a burst of identical error lines into ONE row with a repeat counter", () => {
    for (let i = 0; i < 200; i++) {
      stream.write(`{"level":"error","msg":"button-light setAux failed (ctl R3): send ENETUNREACH"}\n`);
    }
    const all = rows();
    expect(all).toHaveLength(1);
    expect(all[0].context).toMatchObject({ _repeat: 200 });
    expect(teed).toHaveLength(200); // stdout still gets every line
  });

  it("keeps first-occurrence time in _firstAt while createdAt tracks the latest", () => {
    vi.useFakeTimers();
    vi.setSystemTime(new Date("2026-07-08T10:00:00.000Z"));
    stream.write(`{"level":"warn","msg":"same"}\n`);
    vi.setSystemTime(new Date("2026-07-08T10:02:00.000Z"));
    stream.write(`{"level":"warn","msg":"same"}\n`);
    const [row] = rows();
    expect(row.createdAt).toBe("2026-07-08T10:02:00.000Z");
    expect(row.context).toMatchObject({ _repeat: 2, _firstAt: "2026-07-08T10:00:00.000Z" });
  });

  it("a different message (or level) breaks the run — separate rows", () => {
    stream.write(`{"level":"error","msg":"boom A"}\n`);
    stream.write(`{"level":"error","msg":"boom A"}\n`);
    stream.write(`{"level":"error","msg":"boom B"}\n`);
    stream.write(`{"level":"warn","msg":"boom B"}\n`);
    expect(rows()).toHaveLength(3);
  });

  it("an occurrence past the 5-minute window starts a fresh row", () => {
    vi.useFakeTimers();
    vi.setSystemTime(new Date("2026-07-08T10:00:00.000Z"));
    stream.write(`{"level":"error","msg":"slow leak"}\n`);
    vi.setSystemTime(new Date("2026-07-08T10:06:00.000Z"));
    stream.write(`{"level":"error","msg":"slow leak"}\n`);
    expect(rows()).toHaveLength(2);
  });

  it("a CONTINUOUS storm stays one row past the window (each hit refreshes it)", () => {
    vi.useFakeTimers();
    let t = new Date("2026-07-08T10:00:00.000Z").getTime();
    for (let i = 0; i < 10; i++) {
      vi.setSystemTime(new Date(t));
      stream.write(`{"level":"error","msg":"storm"}\n`);
      t += 240_000; // 4 min apart — each inside the window of the PREVIOUS hit
    }
    const all = rows();
    expect(all).toHaveLength(1);
    expect(all[0].context).toMatchObject({ _repeat: 10 });
  });
});