mira
Version:
NearForm Accelerator for Cloud Native Serverless AWS
105 lines • 4 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const glob_1 = __importDefault(require("glob"));
const fs_1 = __importDefault(require("fs"));
const path_1 = __importDefault(require("path"));
const util_1 = require("util");
const crypto_1 = __importDefault(require("crypto"));
const tmp_1 = __importDefault(require("tmp"));
/** @ignore - Excluded from documentation generation. */
const read = util_1.promisify(fs_1.default.readFile).bind(fs_1.default);
/** @ignore - Excluded from documentation generation. */
const stat = util_1.promisify(fs_1.default.stat).bind(fs_1.default);
/** @ignore - Excluded from documentation generation. */
const write = util_1.promisify(fs_1.default.writeFile).bind(fs_1.default);
/**
* The Change Detector Class is used to build and maintain a snapshot of code changes
* between deployments. If there are no changes, Mira will not perform a deployment.
*
* Mira uses the `.mira.snapshot` file in the root of the application folder to track
* changes. A file is considered changed if its time stamp is different to the one listed
* in the snapshot file.
*
* @internal
*/
class ChangeDetector {
constructor(rootPath) {
/**
* The default file name for the snapshot file.
*/
this.snapshotFile = '.mira.snapshot';
this.rootPath = rootPath;
this.defaultSnapshotFilePath = path_1.default.join(this.rootPath, this.snapshotFile);
}
async filesChanged() {
return this.run();
}
async run() {
const snapshot = await this.getSnapshot();
if (!snapshot) {
await this.takeSnapshot(this.defaultSnapshotFilePath);
return true;
}
// check against snapshot
const tempSnapshotFile = tmp_1.default.fileSync();
await this.takeSnapshot(tempSnapshotFile.name);
const buf = await read(this.defaultSnapshotFilePath);
const tmpBuf = await read(tempSnapshotFile.name);
if (buf.equals(tmpBuf)) {
// no changes
return false;
}
return true;
}
async takeSnapshot(outputFile) {
return new Promise((resolve, reject) => {
glob_1.default(`${this.rootPath}/**`, {
ignore: ['**/node_modules/**', '**/cdk.out/**', '**/mira-err**']
}, async (err, res) => {
if (err) {
return reject(err);
}
const output = [];
const promises = res.map(async (file) => {
const relative = path_1.default.relative(this.rootPath, file);
if (relative) { // skip empty files
const fileData = await stat(file);
const hash = this.getHash(`${fileData.size}${fileData.mtime}`);
output.push(`${relative}||${hash}`);
}
});
await Promise.all(promises);
await write(outputFile, output.sort().join('\n'));
return resolve(null);
});
});
}
async getSnapshot() {
try {
const res = await read(path_1.default.join(this.rootPath, this.snapshotFile));
const output = {};
res
.toString()
.split('\n')
.forEach((line) => {
const [file, data] = line.split('||');
output[file] = data;
});
return output;
}
catch (err) {
if (err.code === 'ENOENT') {
return null;
}
throw err;
}
}
getHash(value) {
return crypto_1.default.createHash('md5').update(value).digest('hex');
}
}
exports.default = ChangeDetector;
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