lib/cache/from-config.js

// 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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//     * Redistributions in binary form must reproduce the above copyright
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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
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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import { logger } from '../logger';

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

function createInternal(name, config) {
    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);

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

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