lib/aws.ts

// Copyright (c) 2016, Compiler Explorer Authors
// All rights reserved.
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import AWS from 'aws-sdk';

import {unwrap} from './assert';
import {logger} from './logger';
import {PropertyGetter} from './properties.interfaces';

export class InstanceFetcher {
    ec2: AWS.EC2;
    tagKey: string;
    tagValue: string;

    constructor(properties: PropertyGetter) {
        const region = properties<string>('region');
        logger.info(`New instance fetcher for region ${region}`);
        this.ec2 = new AWS.EC2({region: region});
        this.tagKey = properties<string>('tagKey');
        this.tagValue = properties<string>('tagValue');
    }

    async getInstances() {
        const result = await this.ec2.describeInstances().promise();
        return unwrap(result.Reservations)
            .flatMap(r => r.Instances)
            .filter(reservation => {
                if (unwrap(unwrap(reservation).State).Name !== 'running') return false;
                return unwrap(unwrap(reservation).Tags).some(t => t.Key === this.tagKey && t.Value === this.tagValue);
            }) as AWS.EC2.Instance[];
    }
}

let awsConfigInit = false;
let awsConfig: Record<string, string | undefined> = {};
let awsProps: PropertyGetter | null = null;

async function loadAwsConfig(properties: PropertyGetter) {
    const region = properties<string>('region');
    if (!region) return {};
    const ssm = new AWS.SSM({region: region});
    const path = '/compiler-explorer/';
    try {
        const response = await ssm.getParameters({Names: [path + 'sentryDsn']}).promise();
        const map: Record<string, string | undefined> = {};
        for (const param of unwrap(response.Parameters)) {
            map[unwrap(param.Name).substr(path.length)] = param.Value;
        }
        logger.info('AWS info:', map);
        return map;
    } catch (err) {
        logger.error(`Failed to get AWS info: ${err}`);
        return {};
    }
}

export async function initConfig(properties: PropertyGetter) {
    awsConfigInit = true;
    awsProps = properties;
    awsConfig = await loadAwsConfig(properties);
}

export function getConfig(name): string | undefined {
    if (!awsConfigInit) throw new Error("Reading AWS config before it's loaded");
    return awsConfig[name] || unwrap(awsProps)<string>(name);
}