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const fs = require('fs');
const dataBroadcaster = require('./data-broadcaster');
let logIntervalMs;
let maxLogEntries;
loadLogConfig();
function loadLogConfig() {
try {
let config = JSON.parse(fs.readFileSync('logger-config.json', 'utf8'));
logIntervalMs = (config.logIntervalSeconds * 1000);
maxLogEntries = config.maxLogEntries;
}
catch (err) {
console.warn('Error reading logger config. Reverting to defaults.', err);
logIntervalMs = 60000 // 1 min
maxLogEntries = 1440 // 24 hrs at 1/min
}
}
function startLogging(device) {
setInterval(() => { log(device); }, logIntervalMs);
console.log('Logging started for ' + device.alias + ' [' + device.deviceId + '] every ' + (logIntervalMs/1000) + ' seconds');
}
function writeLog(filePath, log) {
fs.writeFile(filePath, JSON.stringify(log), { flag: 'w' }, (err) => {
if (err) {
console.warn('Error writing log for ' + device.alias + ' [' + device.deviceId + ']', err);
}
});
}
function getLogEntries(filePath, callback) {
fs.access(filePath, fs.constants.F_OK, (err) => {
if(err) {
// No log file, init empty one
writeLog(filePath, []);
callback([]);
}
else {
fs.readFile(filePath, 'utf8', (err, data) => {
if (err) {
console.warn('Error reading usage log ' + filePath, err);
callback([]);
}
else {
callback(JSON.parse(data));
}
});
}
});
}
function log(device) {
device.emeter.getRealtime().then(response => {
let logEntry = {
ts: Date.now(),
pw: (('power_mw' in response) ? (response.power_mw / 1000) : response.power)
}
let filePath = getLogPath(device.deviceId);
getLogEntries(filePath, (entries) => {
entries.push(logEntry)
// Remove old entries
entries.splice(0, entries.length - maxLogEntries);
writeLog(filePath, entries);
dataBroadcaster.broadcastNewLogEntry(device.deviceId, logEntry);
})
});
}
function getLogPath(deviceId) {
return deviceId + '-log.json';
}
function getLogEntriesForDevice(deviceId, callback) {
return getLogEntries(getLogPath(deviceId), callback);
}
module.exports = {
startLogging: startLogging,
log: log,
getLogEntriesForDevice: getLogEntriesForDevice
}
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