wcrisman/TempestDataCollection
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Fixed bugs; Removed caching that would cause problems with spinning up multiple processes.

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This commit is contained in:
DESKTOP-C9V2M01\Zeeri
2022-06-04 08:27:42 -07:00
parent 6287ab13cb
commit 92986cfb23
2 changed files with 38 additions and 87 deletions
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4
app.js
View File

@@ -10,12 +10,14 @@ var pingRouter = require('./routes/ping');
var app = express();
let port = 3003;
let log = false;
if(process.env.PORT) port = process.env.PORT;
if(process.env.LOG) log = process.env.LOG;
console.log("Running on port: " + port);
app.use(logger('dev'));
if(log) app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());

91
routes/ping.js
View File

@@ -13,7 +13,6 @@ if(!uri) {
}
const client = new MongoClient(uri);
let collection;
let records = {};
// We are keeping an in-memory set of current/active records for each Chromebook to reduce the number of reads without _id we perform.
// The idea is that each Chromebook pings every 5 minutes when a student is logged in and using the Chromebook.
@@ -26,29 +25,16 @@ async function connect() {
await client.connect();
const database = client.db("avusd_data_collection");
collection = database.collection('records');
console.log("Connected to Mongodb server");
// console.log("Connected to Mongodb server");
} catch(e) {
console.log("error: caught ping.js:31 in Data Collection.");
console.log(e);
}
}
// Load a record for specific Chromebook by serial number (we assume they are unique).
async function loadRecord(serial) {
//Read record with given serial.
let record = await collection.findOne({serial, closed: false});
//If we found one then add it to the map.
if(record && !record.closed) {
records[record.serial] = record;
}
else {record = null;}
return record;
}
// Create a new record for a Chromebook & user. Set it in the cache (replace any existing one for that serial).
async function createRecord(record, isInternal) {
record.startTime = new Date().getTime();
record.startTime = record.endTime = new Date().getTime();
record.count = 1;
record.internalCount = isInternal ? 1 : 0;
@@ -57,75 +43,35 @@ async function createRecord(record, isInternal) {
//Handle errors.
if(queryResult.writeConcernError && queryResult.writeConcernError.errmsg) {
console.log("error: caught ping.js:61 in Data Collection.");
console.log(queryResult.writeConcernError.errmsg + " ::: " + JSON.stringify(record));
record = null;
}
else {
//Add the map if there were no errors.
records[record.serial] = record;
}
return record;
}
// Update a record. Will create a new record if one doesn't exist for the Chromebook. Will close a record if the user changes, and then create a new one for the new user.
async function updateRecord(record, isInternal, clientAddress) {
let existing = records[record.serial];
try {
if(!collection) {
await connect();
}
//If one is not in the cache, then read it from the db.
if(!existing) {
existing = await loadRecord(record.serial);
}
//Read record with given serial.
let existing = await collection.findOne({serial: record.serial, closed: {$exists: false}});
//If we couldn't find one for the given serial in the db, then create it.
// Note: We only do this if the connection is on the internal network.
// This prevents attackers from spamming the server with random id's to pollute the data.
if(!existing) {
if(isInternal) {
existing = await createRecord(record, isInternal);
}
else {
//Log the external attempt to update a 'new' chromebook.
console.log("Ignoring external (" + clientAddress + ") input: " + JSON.stringify(record));
}
}
else {
let changed = {};
let inc = {};
//If the user has changed, then close the record. Create a new record for the new user.
if(existing.email !== record.email) {
changed.closed = existing.closed = true;
await createRecord(record, isInternal);
}
else {
//Update the time and count for both the db and the in memory data.
changed.endTimestamp = existing.endTimestamp = new Date().getTime();
// Note: Cannot increment this way because there could be multiple instances of this process running with different cached values. Use MongoDB $inc instead.
// changed.count = existing.count = existing.count + 1;
inc.count = 1;
//Update the internal count if the Chromebook address is on the internal network.
if(isInternal) {
// Note: Cannot increment this way because there could be multiple instances of this process running with different cached values. Use MongoDB $inc instead.
// changed.internalCount = existing.internalCount = existing.internalCount + 1;
inc.internalCount = 1;
}
}
//If something changed, then update the db.
if(!_.isEmpty(changed)) {
let result = await collection.updateOne({_id: existing._id}, {$set: changed, $inc: inc});
//Error handling.
if(result.modifiedCount !== 1) {
console.log("Failed to update the record: " + JSON.stringify(existing));
//If the user has changed, then close the record. Create a new record for the new user.
if(existing.email !== record.email) {
await collection.updateOne({_id: existing._id}, {$set: {closed: true}});
await createRecord(record, isInternal);
}
else {
await collection.updateOne({_id: existing._id}, {$set: {endTime: new Date().getTime()}, $inc: {count: 1, internalCount: isInternal ? 1 : 0}});
}
}
} catch(e) {
console.log(e);
}
}
@@ -144,10 +90,12 @@ router.get('/', function(req, res, next) {
// console.log("Serial: " + params.serial);
// console.log("DeviceId: " + params.deviceId);
// Ignore any calls without a serial.
if(params.serial) {
let clientAddress = req.header("X-Real-IP");
if (!clientAddress) clientAddress = req.socket.remoteAddress;
let isLocal = true;
console.log("Found IP: " + clientAddress);
// console.log("Found IP: " + clientAddress);
if (localAddresses) {
isLocal = false;
@@ -159,6 +107,7 @@ router.get('/', function(req, res, next) {
//Note: We are not waiting for this to finish. We don't care about the output.
updateRecord({serial, assetId, deviceId, email}, isLocal, clientAddress);
}
//Send response. Nothing for the moment.
res.setHeader("Access-Control-Allow-Origin", "*");