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index.js
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index.js
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'use strict';
var urllib = require('url');
var _ = require('./lodash');
/**
* Test if two buffers are equal
*
* @param {Buffer} a
* @param {Buffer} b
* @return {Boolean} Whether the two buffers are equal
* @private
*/
exports.bufferEqual = function (a, b) {
if (typeof a.equals === 'function') {
return a.equals(b);
}
if (a.length !== b.length) {
return false;
}
for (var i = 0; i < a.length; ++i) {
if (a[i] !== b[i]) {
return false;
}
}
return true;
};
/**
* Convert a buffer to string, supports buffer array
*
* @param {*} value - The input value
* @param {string} encoding - string encoding
* @return {*} The result
* @example
* ```js
* var input = [new Buffer('foo'), [new Buffer('bar')]];
* var res = convertBufferToString(input, 'utf8');
* expect(res).to.eql(['foo', ['bar']]);
* ```
* @private
*/
exports.convertBufferToString = function (value, encoding) {
if (value instanceof Buffer) {
return value.toString(encoding);
}
if (Array.isArray(value)) {
var length = value.length;
var res = Array(length);
for (var i = 0; i < length; ++i) {
res[i] = value[i] instanceof Buffer && encoding === 'utf8'
? value[i].toString()
: exports.convertBufferToString(value[i], encoding);
}
return res;
}
return value;
};
/**
* Convert a list of results to node-style
*
* @param {Array} arr - The input value
* @return {Array} The output value
* @example
* ```js
* var input = ['a', 'b', new Error('c'), 'd'];
* var output = exports.wrapMultiResult(input);
* expect(output).to.eql([[null, 'a'], [null, 'b'], [new Error('c')], [null, 'd']);
* ```
* @private
*/
exports.wrapMultiResult = function (arr) {
// When using WATCH/EXEC transactions, the EXEC will return
// a null instead of an array
if (!arr) {
return null;
}
var result = [];
var length = arr.length;
for (var i = 0; i < length; ++i) {
var item = arr[i];
if (item instanceof Error) {
result.push([item]);
} else {
result.push([null, item]);
}
}
return result;
};
/**
* Detect the argument is a int
*
* @param {string} value
* @return {boolean} Whether the value is a int
* @example
* ```js
* > isInt('123')
* true
* > isInt('123.3')
* false
* > isInt('1x')
* false
* > isInt(123)
* true
* > isInt(true)
* false
* ```
* @private
*/
exports.isInt = function (value) {
var x = parseFloat(value);
return !isNaN(value) && (x | 0) === x;
};
/**
* Pack an array to an Object
*
* @param {array} array
* @return {object}
* @example
* ```js
* > packObject(['a', 'b', 'c', 'd'])
* { a: 'b', c: 'd' }
* ```
*/
exports.packObject = function (array) {
var result = {};
var length = array.length;
for (var i = 1; i < length; i += 2) {
result[array[i - 1]] = array[i];
}
return result;
};
/**
* Return a callback with timeout
*
* @param {function} callback
* @param {number} timeout
* @return {function}
*/
exports.timeout = function (callback, timeout) {
var timer;
var run = function () {
if (timer) {
clearTimeout(timer);
timer = null;
callback.apply(this, arguments);
}
};
timer = setTimeout(run, timeout, new Error('timeout'));
return run;
};
/**
* Convert an object to an array
*
* @param {object} obj
* @return {array}
* @example
* ```js
* > convertObjectToArray({ a: '1' })
* ['a', '1']
* ```
*/
exports.convertObjectToArray = function (obj) {
var result = [];
var keys = Object.keys(obj);
for (var i = 0, l = keys.length; i < l; i++) {
result.push(keys[i], obj[keys[i]]);
}
return result;
};
/**
* Convert a map to an array
*
* @param {Map} map
* @return {array}
* @example
* ```js
* > convertObjectToArray(new Map([[1, '2']]))
* [1, '2']
* ```
*/
exports.convertMapToArray = function (map) {
var result = [];
var pos = 0;
map.forEach(function (value, key) {
result[pos] = key;
result[pos + 1] = value;
pos += 2;
});
return result;
};
/**
* Convert a non-string arg to a string
*
* @param {*} arg
* @return {string}
*/
exports.toArg = function (arg) {
if (arg === null || typeof arg === 'undefined') {
return '';
}
return String(arg);
};
/**
* Optimize error stack
*
* @param {Error} error - actually error
* @param {string} friendlyStack - the stack that more meaningful
* @param {string} filterPath - only show stacks with the specified path
*/
exports.optimizeErrorStack = function (error, friendlyStack, filterPath) {
var stacks = friendlyStack.split('\n');
var lines = '';
var i;
for (i = 1; i < stacks.length; ++i) {
if (stacks[i].indexOf(filterPath) === -1) {
break;
}
}
for (var j = i; j < stacks.length; ++j) {
lines += '\n' + stacks[j];
}
var pos = error.stack.indexOf('\n');
error.stack = error.stack.slice(0, pos) + lines;
return error;
};
/**
* Parse the redis protocol url
*
* @param {string} url - the redis protocol url
* @return {Object}
*/
exports.parseURL = function (url) {
if (exports.isInt(url)) {
return { port: url };
}
var parsed = urllib.parse(url, true, true);
if (!parsed.slashes && url[0] !== '/') {
url = '//' + url;
parsed = urllib.parse(url, true, true);
}
var result = {};
if (parsed.auth) {
result.password = parsed.auth.split(':')[1];
}
if (parsed.pathname) {
if (parsed.protocol === 'redis:') {
if (parsed.pathname.length > 1) {
result.db = parsed.pathname.slice(1);
}
} else {
result.path = parsed.pathname;
}
}
if (parsed.host) {
result.host = parsed.hostname;
}
if (parsed.port) {
result.port = parsed.port;
}
_.defaults(result, parsed.query);
return result;
};
/**
* Get a random element from `array`
*
* @param {array} array - the array
* @param {number} [from=0] - start index
* @return {}
*/
exports.sample = function (array, from) {
var length = array.length;
if (typeof from !== 'number') {
from = 0;
}
if (from >= length) {
return;
}
return array[from + Math.floor(Math.random() * (length - from))];
};
/**
* Error message for connection being disconnected
*/
exports.CONNECTION_CLOSED_ERROR_MSG = 'Connection is closed.';