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#!/usr/bin/env node
/* jshint esnext: true */
"use strict";
const Promise = require("bluebird");
const logger = global.logger,
KEY_TYPE = process.env.KEY_TYPE || "crunch"; // backwards compat
module.exports = class Service {
setRoutes(routes) { // route str -> func
this.routes = new Map(Object.entries(routes));
}
setDatabases(dbs, defaultDb) { // mode str -> Sequelize
this.dbs = new Map(Object.entries(dbs));
}
getDatabase(category) {
if (!this.dbs.has(category))
logger.error("unsupported database category", category);
return this.dbs.get(category);
}
async register(rmqChannel, expressApp) { // assert queues, initialize routes
this.notify = async (topic, msg) =>
await rmqChannel.publish("amq.topic", topic, new Buffer(msg));
this.forward = async (queue, payload, options) =>
await rmqChannel.sendToQueue(queue, new Buffer(payload), options);
await Promise.all(this.targets, (queue) =>
rmqChannel.assertQueue(queue, { durable: true }));
for(let [route, func] of this.routes) {
expressApp.post(route, func);
}
}
setTargets(queues) { // set channels messages can be forwarded to, str -> str
this.targets = new Map(Object.entries(queues));
}
getTarget(category) { // return channel for category
if (!this.targets.has(category))
logger.error("unsupported queue category", category);
return this.targets.get(category);
}
// return an entry from keys db
async getKey(category, key, default_value) {
const db = this.getDatabase(category),
record = await db.Keys.findOrCreate({
where: {
type: KEY_TYPE,
key: key
},
defaults: { value: default_value }
});
return record[0].value;
}
// update an entry from keys db
async setKey(category, key, value) {
const db = this.getDatabase(category),
record = await db.Keys.findOrCreate({
where: {
type: KEY_TYPE,
key: key
},
defaults: { value: value }
});
record[0].update({ value: value });
return value;
}
}
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