// Copyright (c) 2018, Compiler Explorer Authors
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are met:
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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import * as Sentry from '@sentry/node';

import {GetResult} from '../../types/cache.interfaces';
import {logger} from '../logger';
import {S3Bucket} from '../s3-handler';
import {S3HandlerOptions} from '../s3-handler.interfaces';

import {BaseCache} from './base';

function messageFor(e) {
    return e.message || e.toString();
}

export class S3Cache extends BaseCache {
    private readonly s3: S3Bucket;
    readonly path: string;
    readonly region: string;
    private readonly onError: (Error, string) => void;

    constructor(cacheName: string, bucket: string, path: string, region: string, onError?: (Error, string) => void) {
        super(cacheName, `S3Cache(s3://${bucket}/${path} in ${region})`, 's3');
        this.path = path;
        this.region = region;
        this.s3 = new S3Bucket(bucket, region);
        this.onError =
            onError ||
            ((e, op) => {
                Sentry.captureException(e);
                logger.error(`Error while trying to ${op} S3 cache: ${messageFor(e)}`);
            });
    }

    override async getInternal(key: string): Promise<GetResult> {
        try {
            return await this.s3.get(key, this.path);
        } catch (e) {
            this.onError(e, 'read');
            return {hit: false};
        }
    }

    override async putInternal(key: string, value: Buffer, creator?: string): Promise<void> {
        const options: S3HandlerOptions = {
            metadata: creator ? {CreatedBy: creator} : {},
            redundancy: 'REDUCED_REDUNDANCY',
        };
        try {
            await this.s3.put(key, value, this.path, options);
        } catch (e) {
            this.onError(e, 'write');
        }
    }
}