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metro44060 2020-03-21 15:17:30 -04:00 • committed by GitHub
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lib/document_stores/file.js
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var fs = require('fs');
var crypto = require('crypto');
var winston = require('winston');
// For storing in files
// options[type] = file
// options[path] - Where to store
var FileDocumentStore = function(options) {
this.basePath = options.path || './data';
this.expire = options.expire;
};
// Generate md5 of a string
FileDocumentStore.md5 = function(str) {
var md5sum = crypto.createHash('md5');
md5sum.update(str);
return md5sum.digest('hex');
};
// Save data in a file, key as md5 - since we don't know what we could
// be passed here
FileDocumentStore.prototype.set = function(key, data, callback, skipExpire) {
try {
var _this = this;
fs.mkdir(this.basePath, '700', function() {
var fn = _this.basePath + '/' + FileDocumentStore.md5(key);
fs.writeFile(fn, data, 'utf8', function(err) {
if (err) {
callback(false);
}
else {
callback(true);
if (_this.expire && !skipExpire) {
winston.warn('file store cannot set expirations on keys');
}
}
});
});
} catch(err) {
callback(false);
}
};
// Get data from a file from key
FileDocumentStore.prototype.get = function(key, callback, skipExpire) {
var _this = this;
var fn = this.basePath + '/' + FileDocumentStore.md5(key);
fs.readFile(fn, 'utf8', function(err, data) {
if (err) {
callback(false);
}
else {
callback(data);
if (_this.expire && !skipExpire) {
winston.warn('file store cannot set expirations on keys');
}
}
});
};
module.exports = FileDocumentStore;