lib/cache/from-config.ts

// 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 {logger} from '../logger';

import {Cache} from './base.interfaces';
import {InMemoryCache} from './in-memory';
import {MultiCache} from './multi';
import {NullCache} from './null';
import {OnDiskCache} from './on-disk';
import {S3Cache} from './s3';

function paramInt(config: string, param: string): number {
    const result = parseInt(param);
    if (isNaN(result)) throw new Error(`Bad params: ${config}`);
    return result;
}

function createInternal(name: string, config: string): Cache {
    if (!config) {
        return new NullCache(name);
    }
    const parts = config.split(';');
    if (parts.length > 1) {
        return new MultiCache(name, ...parts.map(part => createInternal(name, part)));
    }
    const match = config.match(/^([^(]+)\(([^)]+)\)$/);
    if (!match) throw new Error(`Unable to parse '${config}'`);
    const params = match[2].split(',');
    switch (match[1]) {
        case 'InMemory':
            if (params.length !== 1) throw new Error(`Bad params: ${config}`);
            return new InMemoryCache(name, paramInt(config, params[0]));

        case 'OnDisk':
            if (params.length !== 2) throw new Error(`Bad params: ${config}`);
            return new OnDiskCache(name, params[0], paramInt(config, params[1]));

        case 'S3':
            if (params.length !== 3) throw new Error(`Bad params: ${config}`);
            return new S3Cache(name, params[0], params[1], params[2]);

        default:
            throw new Error(`Unrecognised cache type '${match[1]}'`);
    }
}

export function createCacheFromConfig(name: string, config: string): Cache {
    const result = createInternal(name, config);
    logger.info(`Created cache ${name} of type ${result.details}`);
    return result;
}