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#!/usr/bin/node
/* jshint esnext:true */
'use strict';
var amqp = require("amqplib"),
Seq = require("sequelize"),
sleep = require("sleep-promise");
var RABBITMQ_URI = process.env.RABBITMQ_URI || "amqp://localhost",
DATABASE_URI = process.env.DATABASE_URI || "sqlite:///db.sqlite",
BATCHSIZE = process.env.PROCESSOR_BATCH || 50 * (1 + 5), // matches + players
IDLE_TIMEOUT = process.env.PROCESSOR_IDLETIMEOUT || 500; // ms
(async () => {
let seq, model, rabbit, ch;
while (true) {
try {
seq = new Seq(DATABASE_URI, { logging: () => {} }),
rabbit = await amqp.connect(RABBITMQ_URI),
ch = await rabbit.createChannel();
await ch.assertQueue("compile", {durable: true});
await ch.assertQueue("analyze", {durable: true});
break;
} catch (err) {
console.error(err);
await sleep(5000);
}
}
model = require("../orm/model")(seq, Seq);
let queue = [],
timer = undefined;
await seq.sync();
// as long as the queue is filled, msg are not ACKed
// server sends as long as there are less than `prefetch` unACKed
await ch.prefetch(BATCHSIZE);
ch.consume("compile", async (msg) => {
queue.push(msg);
// fill queue until batchsize or idle
if (timer === undefined)
timer = setTimeout(process, IDLE_TIMEOUT)
if (queue.length == BATCHSIZE)
await process();
}, { noAck: false });
async function process() {
console.log("compiling batch", queue.length);
// clean up to allow processor to accept while we wait for db
let msgs = queue.slice();
queue = [];
clearTimeout(timer);
timer = undefined;
// aggregate & bulk insert
let participant_stats_records = [],
player_updates = []; // [[what, where]]
// processor sends to queue with a custom "type" so compiler can filter
// m.content: player.api_id
let players = msgs.filter((m) => m.properties.type == "player").map(
(m) => JSON.parse(m.content)).filter((p) => p != undefined),
participants = msgs.filter((m) => m.properties.type == "participant").map(
(m) => JSON.parse(m.content)).filter((p) => p != undefined);
// collect information and populate _record arrays
await Promise.all([
// collect player information
Promise.all(players.map(async (player) => {
let player_api_id = player.api_id;
// set last_match_created_date
let record = await model.Participant.findOne({
where: {
player_api_id: player_api_id
},
attributes: [ [seq.col("roster.match.created_at"), "last_match_created_date"] ],
include: [ {
model: model.Roster,
attributes: [],
include: [ {
model: model.Match,
attributes: []
} ]
} ],
order: [
[seq.col("last_match_created_date"), "DESC"]
]
});
if (record != null)
// do later in the transaction
player_updates.push([
{ last_match_created_date: record.get("last_match_created_date") },
{ where: { api_id: player_api_id } }
]);
})),
// calculate participant fields
Promise.all(participants.map(async (api_participant) => {
participant_stats_records.push(calculate_stats(
await model.Participant.findOne({
where: { api_id: api_participant.api_id },
include: [ {
model: model.Roster,
include: [
model.Match
]
} ]
})
))
}))
]);
// load records into db
try {
console.log("inserting batch into db");
await seq.transaction({ autocommit: false }, async (transaction) => {
await Promise.all([
model.ParticipantStats.bulkCreate(participant_stats_records, {
updateOnDuplicate: [], // all
transaction: transaction
}),
player_updates.map(async (pu) =>
await model.Player.update(pu[0], pu[1]))
]);
});
} catch (err) {
// this should only happen for deadlocks or non-data related issues
console.error(err);
await Promise.all(msgs.map((m) => ch.nack(m, true)) ); // requeue
return; // give up
}
console.log("acking batch");
await Promise.all(msgs.map((m) => ch.ack(m)) );
// notify analyzer
Promise.all(participant_stats_records.map(async (p) =>
await ch.sendToQueue("analyze", new Buffer(p.participant_api_id), {
persistent: true,
type: "participant"
})
));
// notify web
await Promise.all([
Promise.all(players.map(async (p) => await ch.publish("amq.topic", "player." + p.name,
new Buffer("stats_update")) )),
Promise.all(participant_stats_records.map(async (p) => await ch.publish("amq.topic",
"participant." + p.participant_api_id, new Buffer("stats_update")) ))
]);
}
// based on the participant db record from the end of the match,
// calculate a participant_stats record and return it
function calculate_stats(participant) {
if (participant == null) { console.error("got nonexisting participant!"); return; }
let participant_stats = {};
participant_stats.participant_api_id = participant.get("api_id");
participant_stats.kills = participant.get("kills");
if (participant.roster.get("hero_kills") == 0) participant_stats.kill_participation = 0;
else participant_stats.kill_participation = participant.get("kills") / participant.roster.get("hero_kills");
return participant_stats;
}
})();
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