lib/s3-handler.ts

// Copyright (c) 2018, Compiler Explorer Authors
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import AWS from 'aws-sdk';

import {GetResult} from '../types/cache.interfaces';

import {S3HandlerOptions} from './s3-handler.interfaces';

const NoSuchKey = 'NoSuchKey';

export class S3Bucket {
    private readonly instance: AWS.S3;
    readonly bucket: string;
    readonly region: string;

    constructor(bucket: string, region: string) {
        this.instance = new AWS.S3({region});
        this.bucket = bucket;
        this.region = region;
    }

    async get(key: string, path: string): Promise<GetResult> {
        try {
            const result = await this.instance.getObject({Bucket: this.bucket, Key: `${path}/${key}`}).promise();
            return {hit: true, data: result.Body};
        } catch (x: any) {
            if (x.code === NoSuchKey) return {hit: false};
            throw x;
        }
    }

    async delete(key, path): Promise<boolean> {
        try {
            await this.instance.deleteObject({Bucket: this.bucket, Key: `${path}/${key}`}).promise();
        } catch (x: any) {
            if (x.code === NoSuchKey) return false;
            throw x;
        }
        return true;
    }

    async put(key: string, value: Buffer, path: string, options: S3HandlerOptions): Promise<void> {
        await this.instance
            .putObject({
                Bucket: this.bucket,
                Key: `${path}/${key}`,
                Body: value,
                StorageClass: options.redundancy || 'STANDARD',
                Metadata: options.metadata || {},
            })
            .promise();
    }
}