Minetrack/lib/database.js

116 lines
3.8 KiB
JavaScript

const sqlite = require('sqlite3')
const { TimeTracker } = require('./time')
class Database {
constructor (app) {
this._app = app
this._sql = new sqlite.Database('database.sql')
}
ensureIndexes () {
this._sql.serialize(() => {
this._sql.run('CREATE TABLE IF NOT EXISTS pings (timestamp BIGINT NOT NULL, ip TINYTEXT, playerCount MEDIUMINT)')
this._sql.run('CREATE INDEX IF NOT EXISTS ip_index ON pings (ip, playerCount)')
this._sql.run('CREATE INDEX IF NOT EXISTS timestamp_index on PINGS (timestamp)')
})
}
loadGraphPoints (graphDuration, callback) {
// Query recent pings
const endTime = new Date().getTime()
const startTime = endTime - graphDuration
this.getRecentPings(startTime, endTime, pingData => {
const relativeGraphData = []
for (const row of pingData) {
// Load into temporary array
// This will be culled prior to being pushed to the serverRegistration
let graphData = relativeGraphData[row.ip]
if (!graphData) {
relativeGraphData[row.ip] = graphData = [[], []]
}
// DANGER!
// This will pull the timestamp from each row into memory
// This is built under the assumption that each round of pings shares the same timestamp
// This enables all timestamp arrays to have consistent point selection and graph correctly
graphData[0].push(row.timestamp)
graphData[1].push(row.playerCount)
}
Object.keys(relativeGraphData).forEach(ip => {
// Match IPs to serverRegistration object
for (const serverRegistration of this._app.serverRegistrations) {
if (serverRegistration.data.ip === ip) {
const graphData = relativeGraphData[ip]
// Push the data into the instance and cull if needed
serverRegistration.loadGraphPoints(startTime, graphData[0], graphData[1])
break
}
}
})
// Since all timestamps are shared, use the array from the first ServerRegistration
// This is very dangerous and can break if data is out of sync
if (Object.keys(relativeGraphData).length > 0) {
const serverIp = Object.keys(relativeGraphData)[0]
const timestamps = relativeGraphData[serverIp][0]
this._app.timeTracker.loadGraphPoints(startTime, timestamps)
}
callback()
})
}
loadRecords (callback) {
let completedTasks = 0
this._app.serverRegistrations.forEach(serverRegistration => {
// Find graphPeaks
// This pre-computes the values prior to clients connecting
serverRegistration.findNewGraphPeak()
// Query recordData
// When complete increment completeTasks to know when complete
this.getRecord(serverRegistration.data.ip, (playerCount, timestamp) => {
serverRegistration.recordData = {
playerCount,
timestamp: TimeTracker.toSeconds(timestamp)
}
// Check if completedTasks hit the finish value
// Fire callback since #readyDatabase is complete
if (++completedTasks === this._app.serverRegistrations.length) {
callback()
}
})
})
}
getRecentPings (startTime, endTime, callback) {
this._sql.all('SELECT * FROM pings WHERE timestamp >= ? AND timestamp <= ?', [
startTime,
endTime
], (_, data) => callback(data))
}
getRecord (ip, callback) {
this._sql.all('SELECT MAX(playerCount), timestamp FROM pings WHERE ip = ?', [
ip
], (_, data) => callback(data[0]['MAX(playerCount)'], data[0].timestamp))
}
insertPing (ip, timestamp, unsafePlayerCount) {
const statement = this._sql.prepare('INSERT INTO pings (timestamp, ip, playerCount) VALUES (?, ?, ?)')
statement.run(timestamp, ip, unsafePlayerCount)
statement.finalize()
}
}
module.exports = Database