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import { S3 } from "@aws-sdk/client-s3";
import { Readable } from "stream";
import { Storage } from "./Storage";
const readableToBuffer = (readable: Readable): Promise<Buffer> =>
new Promise((resolve, reject) => {
const chunks: Buffer[] = [];
readable.on('data', chunk => chunks.push(chunk));
readable.on('error', reject);
readable.on('end', () => resolve(Buffer.concat(chunks)));
});
export class S3Storage implements Storage {
public constructor(
private client: S3,
private bucket: string,
private basePath?: string,
) {}
/**
* Always return a string, to ensure consistency.
*/
get bucketBasePath() {
return this.basePath ?? '';
}
async set(path: string, data: Buffer): Promise<void> {
await this.client.putObject({
Bucket: this.bucket,
Key: `${this.bucketBasePath}${path}`,
Body: data
});
}
async get(path: string): Promise<Buffer | null> {
try {
const s3Object = await this.client.getObject({
Bucket: this.bucket,
Key: `${this.bucketBasePath ?? ''}${path}`
});
if (!s3Object.Body) return null;
const body = s3Object.Body;
return await readableToBuffer(<Readable> body);
} catch(err) {
console.error(`[CDN] Unable to get S3 object at path ${path}.`);
console.error(err);
return null;
}
}
async delete(path: string): Promise<void> {
await this.client.deleteObject({
Bucket: this.bucket,
Key: `${this.bucketBasePath}${path}`
});
}
}
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