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#!/usr/bin/node
/* jshint esnext:true */
"use strict";
const amqp = require("amqplib"),
winston = require("winston"),
loggly = require("winston-loggly-bulk"),
request = require("request-promise"),
sleep = require("sleep-promise"),
jsonapi = require("./jsonapi"),
AdmZip = require("adm-zip");
const MADGLORY_TOKEN = process.env.MADGLORY_TOKEN,
RABBITMQ_URI = process.env.RABBITMQ_URI || "amqp://localhost",
LOGGLY_TOKEN = process.env.LOGGLY_TOKEN,
GRABBERS = parseInt(process.env.GRABBERS) || 4;
if (MADGLORY_TOKEN == undefined) throw "Need an API token";
const logger = new (winston.Logger)({
transports: [
new (winston.transports.Console)({
timestamp: true,
colorize: true
})
]
});
// loggly integration
if (LOGGLY_TOKEN)
logger.add(winston.transports.Loggly, {
inputToken: LOGGLY_TOKEN,
subdomain: "kvahuja",
tags: ["backend", "apigrabber"],
json: true
});
(async () => {
let rabbit, ch;
while (true) {
try {
rabbit = await amqp.connect(RABBITMQ_URI);
ch = await rabbit.createChannel();
await ch.assertQueue("grab", {durable: true});
await ch.assertQueue("grab_sample", {durable: true});
await ch.assertQueue("process", {durable: true});
break;
} catch (err) {
logger.error("error connecting", err);
await sleep(5000);
}
}
await ch.prefetch(GRABBERS);
ch.consume("grab", async (msg) => {
let payload = JSON.parse(msg.content.toString()),
notify = msg.properties.headers.notify; // where to send progress report
if (msg.properties.type == "matches")
await getAPI(payload, "matches", notify);
if (msg.properties.type == "samples")
await getAPI(payload, "samples");
logger.info("done", payload);
ch.ack(msg);
}, { noAck: false });
ch.consume("grab_sample", async (msg) => {
let payload = JSON.parse(msg.content.toString());
if (msg.properties.type == "sample")
await getSample(payload);
logger.info("done", payload);
ch.ack(msg);
}, { noAck: false });
// loop over API data pages, notify of progress
async function getAPI(payload, where, notify="global") {
let exhausted = false;
payload.params["page[limit]"] = payload.params["page[limit]"] || 50;
payload.params["page[offset]"] = payload.params["page[offset]"] || 0;
while (!exhausted) {
let opts = {
uri: "https://api.dc01.gamelockerapp.com/shards/" + payload.region + "/" + where,
headers: {
"X-Title-ID": "semc-vainglory",
"Authorization": MADGLORY_TOKEN
},
json: true,
gzip: true,
time: true,
forever: true,
strictSSL: true,
resolveWithFullResponse: true
}, failed = false, response;
opts.qs = payload.params;
try {
logger.info("API request", { uri: opts.uri, qs: opts.qs });
response = await request(opts);
let data = jsonapi.parse(response.body);
if (where == "matches") {
// send match structure
await Promise.all(data
.map((match) => ch.sendToQueue("process",
new Buffer(JSON.stringify(match)),
{ persistent: true, type: "match" })
));
}
if (where == "samples") {
// send to self
await Promise.all(data
.map((sample) => ch.sendToQueue("grab_sample",
new Buffer(JSON.stringify(sample.attributes.URL)),
{ persistent: true, type: "sample" })
));
}
// tell web about progress
await ch.publish("amq.topic", notify,
new Buffer("grab_success"));
} catch (err) {
response = err.response;
if (err.statusCode == 429) {
await sleep(1000);
} else if (err.statusCode == 404) {
exhausted = true;
} else {
logger.error("API error",
{ uri: err.options.uri, qs: err.options.qs, error: err.response.body });
exhausted = true;
}
failed = true;
} finally {
logger.info("API response",
{ status: response.statusCode, connection_start: response.timings.connect, connection_end: response.timings.end, ratelimit_remaining: response.headers["x-ratelimit-remaining"] });
}
// next page
if (!failed)
payload.params["page[offset]"] += payload.params["page[limit]"]
}
await ch.publish("amq.topic", notify,
new Buffer("grab_done"));
}
// download a sample ZIP and send to processor
async function getSample(url) {
logger.info("downloading sample", url);
let zipdata = await request({
uri: url,
encoding: null
}),
zip = new AdmZip(zipdata);
await Promise.all(zip.getEntries().map(async (entry) => {
if (entry.isDirectory) return;
let match = jsonapi.parse(JSON.parse(entry.getData().toString("utf8")));
await ch.sendToQueue("process",
new Buffer(JSON.stringify(match)),
{ persistent: true, type: "match" })
}));
logger.info("sample processed", url);
}
})();
process.on("unhandledRejection", err => {
logger.error("Uncaught Promise Error:", err.stack);
});
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