first commit

.gitignore

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+coverage.html
+*.seed
+*.log
+*.csv
+*.dat
+*.out
+*.pid
+*.gz
+
+pids
+logs
+results
+
+node_modules
+npm-debug.log

.npmignore

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+test/
+coverage.html
+lib-cov/
+Makefile
+.travis.yml
+logo.png

.travis.yml

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+language: node_js
+node_js:
+  - '0.11'
+  - '0.10'
+  - 0.8
+  - 0.6
+script: make test-coveralls

LICENSE.txt

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+This software is licensed under the MIT License.
+
+Copyright (C) 2013 by fengmk2 <fengmk2@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

Makefile

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+TESTS = test/*.test.js
+REPORTER = spec
+TIMEOUT = 2000
+MOCHA_OPTS =
+
+install:
+	@npm install
+
+test: install
+	@NODE_ENV=test ./node_modules/mocha/bin/mocha \
+		--reporter $(REPORTER) \
+		--timeout $(TIMEOUT) \
+		$(MOCHA_OPTS) \
+		$(TESTS)
+
+test-cov:
+	@rm -f coverage.html
+	@$(MAKE) test MOCHA_OPTS='--require blanket' REPORTER=html-cov > coverage.html
+	@$(MAKE) test MOCHA_OPTS='--require blanket' REPORTER=travis-cov
+	@ls -lh coverage.html
+
+test-coveralls:
+	@$(MAKE) test
+	@echo TRAVIS_JOB_ID $(TRAVIS_JOB_ID)
+	@$(MAKE) test MOCHA_OPTS='--require blanket' REPORTER=mocha-lcov-reporter | ./node_modules/coveralls/bin/coveralls.js
+
+test-all: test test-cov
+
+.PHONY: install test test-cov test-all test-coveralls
+

README.md

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+cache-dns [![Build Status](https://secure.travis-ci.org/fengmk2/cache-dns.png)](http://travis-ci.org/fengmk2/cache-dns) [![Coverage Status](https://coveralls.io/repos/fengmk2/cache-dns/badge.png)](https://coveralls.io/r/fengmk2/cache-dns)
+=======
+
+![logo](https://raw.github.com/fengmk2/cache-dns/master/logo.png)
+
+Like `dns` module, but cache the results.
+
+## Install
+
+```bash
+$ npm install cache-dns
+```
+
+## Usage
+
+```js
+var CacheDNS = require('cache-dns');
+
+var dns = CacheDNS.create({
+  cacheTime: 10000, // 10 seconds
+});
+dns.resolve4('www.taobao.com', function (err, addresses) {
+  console.log(arguments);
+});
+```
+
+## License 
+
+(The MIT License)
+
+Copyright (c) 2013 fengmk2 <fengmk2@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

benchmark.js

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+/*!
+ * cache-dns - benchmark.js
+ * Copyright(c) 2013 fengmk2 <fengmk2@gmail.com>
+ * MIT Licensed
+ */
+
+"use strict";
+
+/**
+ * Module dependencies.
+ */
+
+var dns = require('dns');
+var CacheDNS = require('./');
+var Benchmark = require('benchmark');
+// https://github.com/bestiejs/benchmark.js/issues/39
+Benchmark.support.timeout = false;
+var suite = new Benchmark.Suite();
+
+var cacheDNS = CacheDNS.create();
+dns.resolve4('www.taobao.com', function () {
+  console.log('dns', arguments);
+});
+cacheDNS.resolve4('www.taobao.com', function () {
+  console.log('cacheDNS', arguments);
+
+  suite
+  .add("cacheDNS.resolve4('www.taobao.com')", function (deferred) {
+    cacheDNS.resolve4('www.taobao.com', function (err, addresses) {
+      deferred.resolve();
+    });
+  }, {defer: true})
+  .add('setImmediate()', function (deferred) {
+    setImmediate(function () {
+      deferred.resolve();
+    });
+  }, {
+    defer: true
+  })
+  .add("dns.resolve4('www.taobao.com')", function (deferred) {
+    dns.resolve4('www.taobao.com', function (err, addresses) {
+      deferred.resolve();
+    });
+  }, {defer: true})
+
+  // add listeners
+  .on('cycle', function (event) {
+    console.log(String(event.target));
+  })
+  .on('complete', function () {
+    console.log('Fastest is ' + this.filter('fastest').pluck('name'));
+    cacheDNS.close();
+  })
+  .run({ async: true });
+});
+

index.js

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+module.exports = require('./lib/cache-dns');

lib/cache-dns.js

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+/*!
+ * cache-dns - lib/cache-dns.js
+ * Copyright(c) 2013 fengmk2 <fengmk2@gmail.com>
+ * MIT Licensed
+ */
+
+"use strict";
+
+/**
+ * Module dependencies.
+ */
+
+var dns = require('dns');
+var util = require('util');
+var EventEmitter = require('events').EventEmitter;
+
+function CacheDNS(options) {
+  if (!(this instanceof CacheDNS)) {
+    return new CacheDNS(options);
+  }
+  EventEmitter.call(this);
+
+  options = options || {};
+  this.cacheTime = options.cacheTime || 10000;
+  this.domains = {};
+  this.timer = setInterval(this._updateCaches.bind(this), this.cacheTime);
+}
+
+util.inherits(CacheDNS, EventEmitter);
+
+CacheDNS.prototype.resolve4 = function (domain, callback) {
+  var addresses = this.domains[domain];
+  if (!addresses) {
+    return this._resolve4(domain, callback);
+  }
+  callback(null, addresses);
+};
+
+CacheDNS.prototype._resolve4 = function (domain, callback) {
+  var self = this;
+  dns.resolve4(domain, function (err, addresses) {
+    self.emit(domain, err, addresses);
+    if (err) {
+      return callback(err);
+    }
+    addresses = addresses || [];
+    if (addresses.length > 0) {
+      self.domains[domain] = addresses;
+    }
+    callback(null, addresses);
+  });
+};
+
+function noop() {}
+
+CacheDNS.prototype._updateCaches = function () {
+  for (var domain in this.domains) {
+    this._resolve4(domain, noop);
+  }
+};
+
+CacheDNS.prototype.close = function () {
+  clearInterval(this.timer);
+};
+
+CacheDNS.create = function (options) {
+  return new CacheDNS(options);
+};
+
+module.exports = CacheDNS;

package.json

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+{
+  "name": "cache-dns",
+  "version": "0.0.1",
+  "description": "Like `dns` module, but cache the results.",
+  "main": "index.js",
+  "scripts": {
+    "test": "make test-all",
+    "blanket": { 
+      "pattern": "cache-dns/lib",
+      "data-cover-flags": {
+        "debug": false
+      }
+    },
+    "travis-cov": {
+      "threshold": 90
+    }
+  },
+  "dependencies": {
+
+  },
+  "devDependencies": {
+    "should": "*",
+    "blanket": "*",
+    "travis-cov": "*",
+    "coveralls": "*",
+    "mocha-lcov-reporter": "*",
+    "pedding": "*",
+    "mm": "*",
+    "benchmark": "*",
+    "mocha": "*"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/fengmk2/cache-dns.git"
+  },
+  "keywords": [
+    "cache-dns"
+  ],
+  "engines": {
+    "node": ">= 0.8.0"
+  },
+  "author": "fengmk2 <fengmk2@gmail.com>",
+  "license": "MIT"
+}