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import type { Attributes, Logger } from "@dispatch/kernel";
import type { MemorySample } from "@dispatch/session-orchestrator";
import { describe, expect, it } from "vitest";
import {
buildGcAttributes,
buildPeriodicAttributes,
type MemoryTelemetryDeps,
startMemoryTelemetry,
} from "./mem-telemetry.js";
/** Minimal capturing logger — records every info/debug/warn/error call. */
interface CapturedLog {
readonly level: string;
readonly msg: string;
readonly attrs?: Attributes;
}
function capturingLogger(): { logger: Logger; logs: CapturedLog[] } {
const logs: CapturedLog[] = [];
const record = (level: string) => (msg: string, attrs?: Attributes) => {
logs.push({ level, msg, attrs });
};
const logger: Logger = {
debug: record("debug"),
info: record("info"),
warn: record("warn"),
error: () => {},
child: () => logger,
span: () => ({
id: "s",
log: logger,
setAttributes: () => {},
addLink: () => {},
child: () => ({}) as never,
end: () => {},
}),
};
return { logger, logs };
}
const SAMPLE_A: MemorySample = {
rss: 100 * 1024 * 1024,
heapUsed: 40 * 1024 * 1024,
heapTotal: 60 * 1024 * 1024,
external: 5 * 1024 * 1024,
arrayBuffers: 2 * 1024 * 1024,
};
const SAMPLE_B: MemorySample = {
rss: 300 * 1024 * 1024,
heapUsed: 80 * 1024 * 1024,
heapTotal: 60 * 1024 * 1024,
external: 5 * 1024 * 1024,
arrayBuffers: 6 * 1024 * 1024,
};
describe("buildPeriodicAttributes", () => {
it("formats the sample as MB and tags the active-conversation count", () => {
const attrs = buildPeriodicAttributes(SAMPLE_A, 3);
expect(attrs).toEqual({
rssMB: 100,
heapUsedMB: 40,
heapTotalMB: 60,
externalMB: 5,
arrayBuffersMB: 2,
activeConversations: 3,
});
});
});
describe("buildGcAttributes", () => {
it("carries absolute after values plus reclaimed (before-after) delta", () => {
const attrs = buildGcAttributes(SAMPLE_A, SAMPLE_B);
// Absolute "after" values (SAMPLE_B).
expect(attrs.rssMB).toBe(300);
expect(attrs.heapUsedMB).toBe(80);
// Reclaimed delta: before - after is negative here (memory GREW), so
// reclaimedRssMB = round((100-300) MB) = -200.
expect(attrs.reclaimedRssMB).toBe(-200);
expect(attrs.reclaimedHeapUsedMB).toBe(-40);
expect(attrs.reclaimedHeapTotalMB).toBe(0);
expect(attrs.reclaimedArrayBuffersMB).toBe(-4);
});
it("shows a positive reclaimed value when GC freed memory", () => {
const attrs = buildGcAttributes(SAMPLE_B, SAMPLE_A);
expect(attrs.reclaimedRssMB).toBe(200);
});
});
describe("startMemoryTelemetry", () => {
function fakeTimers(): {
setInterval: MemoryTelemetryDeps["setInterval"];
clearInterval: MemoryTelemetryDeps["clearInterval"];
tick: (name: "sample" | "gc") => void;
cleared: { sample: number; gc: number };
} {
// Store the callbacks keyed by interval so we can drive either one. The
// gc interval is always larger than the sample interval, so route the
// larger ms to the gc callback.
let sampleCb: (() => void) | undefined;
let gcCb: (() => void) | undefined;
let firstMs = 0;
const cleared = { sample: 0, gc: 0 };
return {
setInterval: (fn, ms) => {
if (firstMs === 0) {
firstMs = ms;
sampleCb = fn;
return "sample" as never;
}
// The second timer registered is the gc one (larger interval).
gcCb = fn;
return "gc" as never;
},
clearInterval: (handle) => {
if (handle === "sample") cleared.sample++;
else if (handle === "gc") cleared.gc++;
},
tick: (name) => {
if (name === "sample") sampleCb?.();
else gcCb?.();
},
cleared,
};
}
it("logs a periodic sample tagged with the active-conversation count", () => {
const { logger, logs } = capturingLogger();
let active = 2;
const timers = fakeTimers();
const handle = startMemoryTelemetry({
logger,
sampleMemory: () => SAMPLE_A,
gc: () => {},
getActiveConversationCount: () => active,
setInterval: timers.setInterval,
clearInterval: timers.clearInterval,
});
timers.tick("sample");
const periodic = logs.find((l) => l.msg === "memory:periodic");
expect(periodic).toBeDefined();
expect(periodic?.attrs?.rssMB).toBe(100);
expect(periodic?.attrs?.activeConversations).toBe(2);
// The count is read live (re-evaluated each tick).
active = 5;
timers.tick("sample");
const periodic2 = logs.filter((l) => l.msg === "memory:periodic");
expect(periodic2).toHaveLength(2);
expect(periodic2[1]?.attrs?.activeConversations).toBe(5);
handle.stop();
expect(timers.cleared.sample).toBe(1);
expect(timers.cleared.gc).toBe(1);
});
it("runs gc and logs RSS before/after on the gc interval", () => {
const { logger, logs } = capturingLogger();
let calls = 0;
const samples = [SAMPLE_A, SAMPLE_B];
const timers = fakeTimers();
const handle = startMemoryTelemetry({
logger,
sampleMemory: () => samples[calls++] as MemorySample,
gc: () => {},
getActiveConversationCount: () => 0,
setInterval: timers.setInterval,
clearInterval: timers.clearInterval,
});
timers.tick("gc");
const gcLog = logs.find((l) => l.msg === "memory:gc");
expect(gcLog).toBeDefined();
// before=SAMPLE_A (call 0), after=SAMPLE_B (call 1) — rss grew 100→300.
expect(gcLog?.attrs?.rssMB).toBe(300);
expect(gcLog?.attrs?.reclaimedRssMB).toBe(-200);
handle.stop();
});
it("actually calls the injected gc function", () => {
const { logger } = capturingLogger();
let gcCalls = 0;
const timers = fakeTimers();
const handle = startMemoryTelemetry({
logger,
sampleMemory: () => SAMPLE_A,
gc: () => {
gcCalls++;
},
getActiveConversationCount: () => 0,
setInterval: timers.setInterval,
clearInterval: timers.clearInterval,
});
timers.tick("gc");
expect(gcCalls).toBe(1);
// Periodic ticks do NOT trigger gc.
timers.tick("sample");
expect(gcCalls).toBe(1);
handle.stop();
});
it("stop is idempotent (clearing twice is harmless)", () => {
const { logger } = capturingLogger();
const timers = fakeTimers();
const handle = startMemoryTelemetry({
logger,
sampleMemory: () => SAMPLE_A,
gc: () => {},
getActiveConversationCount: () => 0,
setInterval: timers.setInterval,
clearInterval: timers.clearInterval,
});
handle.stop();
handle.stop();
// Both timers cleared exactly once each (second stop is a no-op on the
// same handles — clear count stays at 1 per handle).
expect(timers.cleared.sample).toBe(1);
expect(timers.cleared.gc).toBe(1);
});
});
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