Add user-agent support

Author: aleafs

README.md

@@ -3,7 +3,7 @@
 
 ## About
 
-`httpha`
+`httpha` is a simple client-side load balance and HA module.
 
 ## Usage
 
@@ -13,13 +13,16 @@ var httpha = require('httpha');
 
 var ha = httpha.create({
   'interval' : 1000,
-}, httpha.httpStatusChecker('/status', 1000));
+}, httpha.httpStatusChecker('/status', {
+  'timeout' : 1000,
+}));
 
 ha.add({'hostname' : '127.0.0.1', 'port' : 8080});
 ha.add({'hostname' : '127.0.0.2', 'port' : 8080});
 ha.add({'hostname' : '127.0.0.1', 'port' : 8081});
 
-ha.fetch();
+console.log(ha.fetch());
+console.log(ha.fetch());
 
 ```
 

lib/httpha.js

@@ -107,13 +107,16 @@ exports.create = function (options, helper) {
   return _me;
 };
 
-exports.httpStatusChecker = function (request, timeout) {
+exports.httpStatusChecker = function (request, options) {
   request = String(request).trim();
   if ('/' !== request.substring(0, 1)) {
     request = '/' + request;
   }
 
-  timeout = parseInt(timeout, 10) || 1000;
+  var configs = _extend({
+    'timeout' : 1000,
+    'useragent' : 'HttpHA/0.1.0',
+  }, options);
 
   return function (one, done) {
     var tmo = null;
@@ -128,6 +131,9 @@ exports.httpStatusChecker = function (request, timeout) {
     var req = http.request(_extend(one, {
       'method' : 'HEAD',
       'path' : request,
+      'headers' : {
+        'User-Agent' : configs.useragent,
+      }
     }), function (res) {
       if (tmo) {
         clearTimeout(tmo);
@@ -140,10 +146,10 @@ exports.httpStatusChecker = function (request, timeout) {
 
     tmo = setTimeout(function () {
       req.abort();
-      var err = new Error('HeartBeat request "' + request + '" timeout after ' + timeout + 'ms');
+      var err = new Error('HeartBeat request "' + request + '" timeout after ' + configs.timeout + 'ms');
       err.name = 'RequestTimeout';
       callback(err);
-    }, timeout);
+    }, configs.timeout);
 
     req.once('error', function (err) {
       callback(err);

package.json

@@ -1,8 +1,8 @@
 {
   "name": "httpha",
-  "description": "",
-  "keywords": [ "system", "infomation", "usage" ],
-  "version": "0.0.1",
+  "description": "`httpha` is a simple client-side load balance and HA module.",
+  "keywords": [ "load balance", "high available", "HA", "client-side" ],
+  "version": "0.1.0",
   "author": "Aleafs Zhang ([email protected])",
   "repository": { 
     "type": "git", 

test/httpha.test.js

@@ -117,7 +117,9 @@ describe('http status checker', function () {
     var wait = function (idx, cb) {
       all[idx] = true;
 
-      var _fn = httpha.httpStatusChecker(idx, 20);
+      var _fn = httpha.httpStatusChecker(idx, {
+        'timeout' : 20,
+      });
       _fn({'hostname' : '127.0.0.1', 'port' : P}, function (err, yes) {
         cb(err, yes);
         all[idx] = null;