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@@ -0,0 +1,420 @@
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// odometer Service
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// Purpose: Converts Roomba wheel encoder samples into persistent rover distance totals.
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// Scope: Owns encoder rollover handling, sanity filtering, per-rover odometer state, and disk persistence.
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const fs = require('fs');
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const path = require('path');
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const EventEmitter = require('events');
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const { resolveDataPath } = require('../../helpers/dataPaths');
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const logger = require('../../globals/logger').child('odometerService');
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const STORE_PATH = resolveDataPath('rover-odometers.json');
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const ENCODER_MODULUS = 65536;
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const ENCODER_HALF_RANGE = ENCODER_MODULUS / 2;
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const DEFAULT_WHEEL_DIAMETER_MM = 72.0;
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const DEFAULT_COUNTS_PER_REVOLUTION = 508.8;
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const DEFAULT_MM_PER_COUNT = (Math.PI * DEFAULT_WHEEL_DIAMETER_MM) / DEFAULT_COUNTS_PER_REVOLUTION;
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const DEFAULT_CALIBRATION_MULTIPLIER = 1;
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const MAX_REASONABLE_SPEED_MM_PER_SECOND = 1200;
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const MAX_REASONABLE_DELTA_FLOOR_MM = 250;
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const SAVE_DEBOUNCE_MS = 2500;
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const MIN_SAVE_INTERVAL_MS = 10000;
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const EMIT_THROTTLE_MS = 500;
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const odometerEvents = new EventEmitter();
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const states = new Map();
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let saveTimer = null;
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let lastSaveAt = 0;
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let loaded = false;
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function nowMs() {
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return Date.now();
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}
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function safeNumber(value, fallback = 0) {
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const numeric = Number(value);
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return Number.isFinite(numeric) ? numeric : fallback;
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}
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function createInitialComparison() {
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return {
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sampleCount: 0,
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missingDistanceSamples: 0,
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ignoredSamples: 0,
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encoderSessionMm: 0,
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distancePacketSessionMm: 0,
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signedEncoderSessionMm: 0,
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signedDistancePacketSessionMm: 0,
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last: null,
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};
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}
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function normalizeStoredEntry(entry = {}) {
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const totalMm = Math.max(0, safeNumber(entry.totalMm, 0));
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const calibrationMultiplier = Math.max(0.01, safeNumber(entry.calibrationMultiplier, DEFAULT_CALIBRATION_MULTIPLIER));
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return {
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totalMm,
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calibrationMultiplier,
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updatedAt: safeNumber(entry.updatedAt, null),
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};
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}
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function ensureLoaded() {
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if (loaded) return;
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loaded = true;
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try {
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const raw = JSON.parse(fs.readFileSync(STORE_PATH, 'utf8'));
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const rovers = raw && typeof raw === 'object' && raw.rovers && typeof raw.rovers === 'object'
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? raw.rovers
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: raw;
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Object.entries(rovers || {}).forEach(([roverId, entry]) => {
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const normalized = normalizeStoredEntry(entry);
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states.set(String(roverId), {
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roverId: String(roverId),
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totalMm: normalized.totalMm,
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sessionMm: 0,
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calibrationMultiplier: normalized.calibrationMultiplier,
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lastLeftCount: null,
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lastRightCount: null,
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lastSampleAt: null,
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lastIntegratedAt: null,
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lastDelta: null,
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rolloverEvents: 0,
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ignoredSamples: 0,
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status: 'waiting',
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statusReason: 'waiting for encoder sample',
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comparison: createInitialComparison(),
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lastEmittedAt: 0,
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lastEmittedStatus: null,
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updatedAt: normalized.updatedAt,
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});
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});
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} catch (err) {
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if (err.code !== 'ENOENT') {
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logger.warn('Failed to load rover odometers', { path: STORE_PATH, error: err.message });
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}
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}
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}
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function ensureState(roverId) {
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ensureLoaded();
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const id = String(roverId || '').trim();
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if (!id) return null;
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if (!states.has(id)) {
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states.set(id, {
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roverId: id,
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totalMm: 0,
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sessionMm: 0,
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calibrationMultiplier: DEFAULT_CALIBRATION_MULTIPLIER,
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lastLeftCount: null,
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lastRightCount: null,
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lastSampleAt: null,
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lastIntegratedAt: null,
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lastDelta: null,
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rolloverEvents: 0,
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ignoredSamples: 0,
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status: 'waiting',
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statusReason: 'waiting for encoder sample',
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comparison: createInitialComparison(),
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lastEmittedAt: 0,
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lastEmittedStatus: null,
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updatedAt: null,
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});
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}
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return states.get(id);
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}
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function signedEncoderDelta(previous, current) {
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let delta = current - previous;
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if (delta > ENCODER_HALF_RANGE) {
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delta -= ENCODER_MODULUS;
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} else if (delta < -ENCODER_HALF_RANGE) {
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delta += ENCODER_MODULUS;
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}
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return delta;
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}
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function crossedRollover(previous, current, delta) {
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// The unwrapped delta is intentionally compared with the raw subtraction.
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// If they differ, the encoder crossed the signed 16-bit boundary between
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// samples and the modular correction above was required.
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return current - previous !== delta;
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}
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function maxReasonableDeltaMm(elapsedMs) {
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const elapsedSeconds = Math.max(0.05, safeNumber(elapsedMs, 0) / 1000);
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return Math.max(MAX_REASONABLE_DELTA_FLOOR_MM, elapsedSeconds * MAX_REASONABLE_SPEED_MM_PER_SECOND);
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}
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function persistSoon() {
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const elapsed = nowMs() - lastSaveAt;
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if (elapsed >= MIN_SAVE_INTERVAL_MS) {
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saveNow();
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return;
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}
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if (saveTimer) return;
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saveTimer = setTimeout(() => {
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saveTimer = null;
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saveNow();
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}, Math.max(SAVE_DEBOUNCE_MS, MIN_SAVE_INTERVAL_MS - elapsed));
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}
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function saveNow() {
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ensureLoaded();
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const rovers = {};
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for (const [roverId, state] of states.entries()) {
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rovers[roverId] = {
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totalMm: Math.round(state.totalMm * 1000) / 1000,
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calibrationMultiplier: state.calibrationMultiplier,
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updatedAt: state.updatedAt || null,
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};
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}
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const payload = {
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version: 1,
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unit: 'millimeters',
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source: 'roomba wheel encoders',
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mmPerCount: DEFAULT_MM_PER_COUNT,
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rovers,
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};
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try {
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fs.mkdirSync(path.dirname(STORE_PATH), { recursive: true });
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const tempPath = `${STORE_PATH}.tmp`;
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fs.writeFileSync(tempPath, `${JSON.stringify(payload, null, 2)}\n`, 'utf8');
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fs.renameSync(tempPath, STORE_PATH);
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lastSaveAt = nowMs();
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} catch (err) {
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logger.warn('Failed to save rover odometers', { path: STORE_PATH, error: err.message });
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}
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}
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function percentDifference(differenceMm, referenceMm) {
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const reference = Math.abs(safeNumber(referenceMm, 0));
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if (reference < 1) return null;
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return Math.round((Math.abs(differenceMm) / reference) * 1000) / 10;
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}
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function snapshotComparison(comparison = createInitialComparison()) {
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const sessionDifferenceMm = comparison.distancePacketSessionMm - comparison.encoderSessionMm;
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return {
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sampleCount: comparison.sampleCount,
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missingDistanceSamples: comparison.missingDistanceSamples,
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ignoredSamples: comparison.ignoredSamples,
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encoderSessionMm: Math.round(comparison.encoderSessionMm),
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distancePacketSessionMm: Math.round(comparison.distancePacketSessionMm),
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signedEncoderSessionMm: Math.round(comparison.signedEncoderSessionMm),
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signedDistancePacketSessionMm: Math.round(comparison.signedDistancePacketSessionMm),
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sessionDifferenceMm: Math.round(sessionDifferenceMm),
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sessionDifferencePct: percentDifference(sessionDifferenceMm, comparison.encoderSessionMm),
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last: comparison.last,
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};
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}
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function snapshotState(state) {
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if (!state) return null;
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return {
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roverId: state.roverId,
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totalMm: Math.round(state.totalMm),
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sessionMm: Math.round(state.sessionMm),
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calibrationMultiplier: state.calibrationMultiplier,
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mmPerCount: DEFAULT_MM_PER_COUNT * state.calibrationMultiplier,
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rawMmPerCount: DEFAULT_MM_PER_COUNT,
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countsPerRevolution: DEFAULT_COUNTS_PER_REVOLUTION,
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wheelDiameterMm: DEFAULT_WHEEL_DIAMETER_MM,
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lastLeftCount: state.lastLeftCount,
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lastRightCount: state.lastRightCount,
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lastSampleAt: state.lastSampleAt,
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lastIntegratedAt: state.lastIntegratedAt,
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lastDelta: state.lastDelta,
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rolloverEvents: state.rolloverEvents,
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ignoredSamples: state.ignoredSamples,
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comparison: snapshotComparison(state.comparison),
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status: state.status,
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statusReason: state.statusReason,
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updatedAt: state.updatedAt,
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};
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}
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function updateDistancePacketComparison(state, sensors, encoderCenterMm, encoderDistanceMm, options = {}) {
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const comparison = state.comparison || createInitialComparison();
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state.comparison = comparison;
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const packetMm = Number(sensors?.distanceMm);
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const ignored = Boolean(options.ignored);
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if (!Number.isFinite(packetMm)) {
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comparison.missingDistanceSamples += 1;
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return;
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}
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const packetDistanceMm = Math.abs(packetMm);
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const signedDifferenceMm = packetMm - encoderCenterMm;
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const distanceDifferenceMm = packetDistanceMm - encoderDistanceMm;
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comparison.sampleCount += 1;
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if (ignored) {
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// Ignored encoder deltas are still recorded as a point-in-time diagnostic,
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// but they are not folded into the session totals. That keeps reconnect
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// edges from making the distance-packet comparison look worse than the
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// odometer's own accepted movement stream.
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comparison.ignoredSamples += 1;
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} else {
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comparison.encoderSessionMm += encoderDistanceMm;
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comparison.distancePacketSessionMm += packetDistanceMm;
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comparison.signedEncoderSessionMm += encoderCenterMm;
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comparison.signedDistancePacketSessionMm += packetMm;
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}
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comparison.last = {
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encoderCenterMm: Math.round(encoderCenterMm),
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encoderDistanceMm: Math.round(encoderDistanceMm),
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distancePacketMm: Math.round(packetMm),
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distancePacketAbsMm: Math.round(packetDistanceMm),
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signedDifferenceMm: Math.round(signedDifferenceMm),
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distanceDifferenceMm: Math.round(distanceDifferenceMm),
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signedDifferencePct: percentDifference(signedDifferenceMm, encoderCenterMm),
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distanceDifferencePct: percentDifference(distanceDifferenceMm, encoderDistanceMm),
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ignored,
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};
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}
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function emitSnapshot(state, snapshot, options = {}) {
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const force = Boolean(options.force);
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const emittedRecently = nowMs() - safeNumber(state.lastEmittedAt, 0) < EMIT_THROTTLE_MS;
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const statusChanged = state.lastEmittedStatus !== state.status;
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if (!force && emittedRecently && !statusChanged) return;
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// Odometer updates are presentation data, not control-loop data. Throttling
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// here keeps browser traffic proportional to what humans can read while the
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// integration math above still processes every sensor frame.
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state.lastEmittedAt = nowMs();
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state.lastEmittedStatus = state.status;
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odometerEvents.emit('update', { roverId: state.roverId, odometer: snapshot });
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}
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function getSnapshot(roverId) {
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return snapshotState(ensureState(roverId));
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}
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function getSnapshots(roverIds = null) {
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ensureLoaded();
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const ids = Array.isArray(roverIds) ? roverIds.map((id) => String(id)) : Array.from(states.keys());
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return ids.map((id) => snapshotState(ensureState(id))).filter(Boolean);
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}
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function processSensorFrame(roverId, sensors = {}) {
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const state = ensureState(roverId);
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if (!state) return null;
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const left = Number(sensors?.encoderCountsLeft);
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const right = Number(sensors?.encoderCountsRight);
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const sampleAt = nowMs();
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if (!Number.isInteger(left) || !Number.isInteger(right)) {
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state.status = 'waiting';
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state.statusReason = 'encoder counts missing';
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return snapshotState(state);
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}
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if (state.lastLeftCount == null || state.lastRightCount == null) {
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// The first valid frame becomes the baseline because encoder packets are
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// cumulative counters inside the Roomba, not distance-since-last-poll
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// packets. Adding the first absolute value would invent mileage whenever
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// the server or rover reconnects.
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state.lastLeftCount = left;
|
|
|
|
|
state.lastRightCount = right;
|
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|
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state.lastSampleAt = sampleAt;
|
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|
|
|
state.status = 'tracking';
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|
|
|
|
state.statusReason = 'baseline ready';
|
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|
|
|
state.updatedAt = sampleAt;
|
|
|
|
|
const snapshot = snapshotState(state);
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|
|
|
emitSnapshot(state, snapshot, { force: true });
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|
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|
|
return snapshot;
|
|
|
|
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}
|
|
|
|
|
|
|
|
|
|
const leftCounts = signedEncoderDelta(state.lastLeftCount, left);
|
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|
|
|
const rightCounts = signedEncoderDelta(state.lastRightCount, right);
|
|
|
|
|
const elapsedMs = state.lastSampleAt ? sampleAt - state.lastSampleAt : 0;
|
|
|
|
|
const mmPerCount = DEFAULT_MM_PER_COUNT * state.calibrationMultiplier;
|
|
|
|
|
const leftMm = leftCounts * mmPerCount;
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|
|
const rightMm = rightCounts * mmPerCount;
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|
|
const centerMm = (leftMm + rightMm) / 2;
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|
|
const distanceMm = Math.abs(centerMm);
|
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|
|
|
const reasonableLimit = maxReasonableDeltaMm(elapsedMs);
|
|
|
|
|
const leftRolled = crossedRollover(state.lastLeftCount, left, leftCounts);
|
|
|
|
|
const rightRolled = crossedRollover(state.lastRightCount, right, rightCounts);
|
|
|
|
|
|
|
|
|
|
state.lastLeftCount = left;
|
|
|
|
|
state.lastRightCount = right;
|
|
|
|
|
state.lastSampleAt = sampleAt;
|
|
|
|
|
if (leftRolled) state.rolloverEvents += 1;
|
|
|
|
|
if (rightRolled) state.rolloverEvents += 1;
|
|
|
|
|
|
|
|
|
|
if (distanceMm > reasonableLimit) {
|
|
|
|
|
// A single impossible jump is much more likely to be stale serial data,
|
|
|
|
|
// a reconnect edge, or corrupt parsing than real movement. The baseline is
|
|
|
|
|
// still advanced so the next good frame can continue from the new counter.
|
|
|
|
|
state.ignoredSamples += 1;
|
|
|
|
|
state.status = 'ignored';
|
|
|
|
|
state.statusReason = `ignored ${Math.round(distanceMm)} mm jump`;
|
|
|
|
|
state.lastDelta = {
|
|
|
|
|
leftCounts,
|
|
|
|
|
rightCounts,
|
|
|
|
|
leftMm: Math.round(leftMm),
|
|
|
|
|
rightMm: Math.round(rightMm),
|
|
|
|
|
centerMm: Math.round(centerMm),
|
|
|
|
|
distanceMm: 0,
|
|
|
|
|
elapsedMs,
|
|
|
|
|
ignored: true,
|
|
|
|
|
};
|
|
|
|
|
updateDistancePacketComparison(state, sensors, centerMm, distanceMm, { ignored: true });
|
|
|
|
|
state.updatedAt = sampleAt;
|
|
|
|
|
const snapshot = snapshotState(state);
|
|
|
|
|
emitSnapshot(state, snapshot);
|
|
|
|
|
return snapshot;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
state.totalMm += distanceMm;
|
|
|
|
|
state.sessionMm += distanceMm;
|
|
|
|
|
updateDistancePacketComparison(state, sensors, centerMm, distanceMm);
|
|
|
|
|
state.lastIntegratedAt = sampleAt;
|
|
|
|
|
state.status = 'tracking';
|
|
|
|
|
state.statusReason = distanceMm > 0 ? 'integrated encoder delta' : 'no movement';
|
|
|
|
|
state.lastDelta = {
|
|
|
|
|
leftCounts,
|
|
|
|
|
rightCounts,
|
|
|
|
|
leftMm: Math.round(leftMm),
|
|
|
|
|
rightMm: Math.round(rightMm),
|
|
|
|
|
centerMm: Math.round(centerMm),
|
|
|
|
|
distanceMm: Math.round(distanceMm),
|
|
|
|
|
elapsedMs,
|
|
|
|
|
ignored: false,
|
|
|
|
|
};
|
|
|
|
|
state.updatedAt = sampleAt;
|
|
|
|
|
persistSoon();
|
|
|
|
|
const snapshot = snapshotState(state);
|
|
|
|
|
emitSnapshot(state, snapshot);
|
|
|
|
|
return snapshot;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
function resetSession(roverId) {
|
|
|
|
|
const state = ensureState(roverId);
|
|
|
|
|
if (!state) return null;
|
|
|
|
|
state.sessionMm = 0;
|
|
|
|
|
state.comparison = createInitialComparison();
|
|
|
|
|
state.updatedAt = nowMs();
|
|
|
|
|
const snapshot = snapshotState(state);
|
|
|
|
|
emitSnapshot(state, snapshot, { force: true });
|
|
|
|
|
return snapshot;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
process.on('exit', () => {
|
|
|
|
|
if (saveTimer) {
|
|
|
|
|
clearTimeout(saveTimer);
|
|
|
|
|
saveTimer = null;
|
|
|
|
|
}
|
|
|
|
|
saveNow();
|
|
|
|
|
});
|
|
|
|
|
|
|
|
|
|
module.exports = {
|
|
|
|
|
ENCODER_MODULUS,
|
|
|
|
|
DEFAULT_MM_PER_COUNT,
|
|
|
|
|
odometerEvents,
|
|
|
|
|
getSnapshot,
|
|
|
|
|
getSnapshots,
|
|
|
|
|
processSensorFrame,
|
|
|
|
|
resetSession,
|
|
|
|
|
saveNow,
|
|
|
|
|
};
|
legop3