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@@ -256,6 +256,22 @@ describe("AnprBridge", () => {
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expect((skips[0].detail as { plate?: string }).plate).toBe("ZZ999ZZ");
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});
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it("analyzes AT LEAST ONE frame even if the poll window already elapsed (loaded host)", async () => {
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// Regression for a CI flake (2026-07-04): with a plain `while`, a window that lapsed
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// between deadline-set and loop-entry (slow runner; here forced with a 0ms window)
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// meant ZERO analyze attempts — the detection was silently dropped ("gave up") and no
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// skip was recorded. The do-while guarantees one frame per detection regardless of load.
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process.env.ANPR_POLL_WINDOW_MS = "0";
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const cam = seedCamera({ anpr: true });
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const vision = fakeVision({ plate: "ZZ999ZZ", confidence: 0.97 });
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const bridge = new AnprBridge(db, vision, fakeSubFlow(null), silentLogger());
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await captureReads(() => bridge.onVehicleDetected(cam));
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expect(captureSnapshot).toHaveBeenCalledTimes(1); // the guaranteed first attempt
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const skips = db.select().from(deviceEventsTable).where(eq(deviceEventsTable.kind, "anpr-skip")).all();
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expect(skips).toHaveLength(1);
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});
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it("debounces: two vehicle events within the window analyze/emit at most once", async () => {
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const cam = seedCamera({ anpr: true });
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const vision = fakeVision({ plate: "AA111BB", confidence: 0.97 });
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@@ -192,7 +192,12 @@ export class AnprBridge {
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const hardCap = Date.now() + this.#pollMaxMs;
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let attempts = 0;
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try {
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while (Date.now() < Math.min(this.#pollDeadline.get(deviceId) ?? 0, hardCap)) {
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// DO-while: a detection always analyzes AT LEAST ONE frame, however loaded the
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// host — a plain while could zero-iterate if the window elapsed between setting
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// the deadline and reaching the loop (seen as a CI flake with the tests' 5ms
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// window; on a busy booth it would silently drop a real car's detection). Exit
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// is via the breaks below (confident read, or next tick would pass the deadline).
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do {
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attempts++;
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const shot = await camera.captureSnapshot({ direction });
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const r = await this.#vision.analyze(shot.bytes, shot.contentType);
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@@ -229,7 +234,7 @@ export class AnprBridge {
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const effDeadline = Math.min(this.#pollDeadline.get(deviceId) ?? 0, hardCap);
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if (Date.now() + this.#pollMs >= effDeadline) break;
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await sleep(this.#pollMs);
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}
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} while (true);
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} finally {
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this.#polling.delete(deviceId);
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this.#pollDeadline.delete(deviceId);
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