const fs = require('graceful-fs');
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const promisify = require('./util/promisify');
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const fsReadFile = promisify(fs.readFile, { context: fs });
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const fsWriteFile = promisify(fs.writeFile, { context: fs });
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class JsonSerializer {
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constructor({ cacheDirPath }) {
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this.path = cacheDirPath;
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if (!/\.json$/.test(this.path)) {
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this.path += '.json';
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}
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}
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read() {
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const cacheDirPath = this.path;
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return fsReadFile(cacheDirPath, 'utf8')
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.catch(() => '{}')
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.then(JSON.parse);
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}
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write(moduleOps) {
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const cacheDirPath = this.path;
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return this.read()
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.then(cache => {
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for (let i = 0; i < moduleOps.length; i++) {
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const op = moduleOps[i];
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cache[op.key] = op.value;
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}
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return cache;
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})
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.then(JSON.stringify)
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.then(cache => fsWriteFile(cacheDirPath, cache));
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}
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}
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module.exports = JsonSerializer;
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