Add LDClient, getFlag

Author: arun251

composer.json

@@ -14,13 +14,22 @@
         }
     ],
     "require": {
-        "php": ">=5.4"
+        "php": ">=5.4",
+        "guzzlehttp/guzzle": "5.0.*",
+        "guzzlehttp/cache-subscriber": "0.1.*"
     },
     "require-dev": {
         "phpunit/phpunit": "4.3.*",
         "phpdocumentor/phpdocumentor": "2.*"
     },
     "autoload": {
-        "files": ["lib/LaunchDarkly.php"]
+        "psr-4": {
+            "": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "": "tests/"
+        }
     }
 }

lib/LaunchDarkly.php

@@ -1,4 +1,5 @@
 <?php
+namespace LaunchDarkly;
 
 class FeatureRep {
     protected static $LONG_SCALE = 0xFFFFFFFFFFFFFFF;

lib/LaunchDarkly/FeatureRep.php renamed to src/LaunchDarkly/FeatureRep.php

@@ -0,0 +1,75 @@
+<?php
+namespace LaunchDarkly;
+
+use \GuzzleHttp\Exception\BadResponseException;
+use \GuzzleHttp\Subscriber\Cache\CacheSubscriber;
+
+class LDClient {
+    const DEFAULT_BASE_URI = 'https://app.launchdarkly.com';
+    const VERSION = '0.1.0';
+
+    protected $_apiKey;
+    protected $_baseUri;
+    protected $_client;
+
+    public function __construct($apiKey, $baseUri = self::DEFAULT_BASE_URI) {
+        $this->_apiKey = $apiKey;
+        $this->_baseUri = $baseUri;
+        $this->_client = $this->_make_client();
+    }
+
+    public function getFlag($key, $user, $default = false) {
+        try {
+            $flag = $this->_getFlag($key, $user, $default);
+            return is_null($flag) ? $default : $flag;
+        } catch (Exception $e) {
+            error_log("LaunchDarkly caught $e");
+            return $default;
+        }
+    }
+
+    protected function _getFlag($key, $user, $default) {
+        try {
+            $response = $this->_client->get("/api/eval/features/$key");
+            return self::_decode($response->json(), $user);
+        } catch (BadResponseException $e) {
+            $code = $e->getResponse()->getStatusCode();
+            error_log("LDClient::getFlag received HTTP status code $code, using default");
+            return $default;
+        }
+    }
+
+    protected function _make_client() {
+        $client = new \GuzzleHttp\Client([
+            'base_url' => $this->_baseUri,
+            'defaults' => [
+                'headers' => [
+                    'Authorization' => "api_key {$this->_apiKey}",
+                    'Content-Type'  => 'application/json',
+                    'User-Agent'    => 'PHPClient/' . VERSION
+                ]
+            ]
+        ]);
+
+        CacheSubscriber::attach($client);
+        return $client;
+    }
+
+    protected static function _decode($json, $user) {
+        $makeVariation = function ($v) {
+            $makeTarget = function ($t) {
+                return new TargetRule($t['attribute'], $t['op'], $t['values']);
+            };
+
+            $ts = empty($v['targets']) ? [] : $v['targets'];
+            $targets = array_map($makeTarget, $ts);
+            return new Variation($v['value'], $v['weight'], $targets);
+        };
+
+        $vs = empty($json['variations']) ? [] : $json['variations'];
+        $variations = array_map($makeVariation, $vs);
+        $feature = new FeatureRep($json['name'], $json['key'], $json['salt'], $json['on'], $variations);
+
+        return $feature->evaluate($user);
+    }
+}

src/LaunchDarkly/LDClient.php

@@ -1,4 +1,5 @@
 <?php
+namespace LaunchDarkly;
 
 class LDUser {
     protected $_key = null;

lib/LaunchDarkly/LDUser.php renamed to src/LaunchDarkly/LDUser.php

@@ -1,4 +1,5 @@
 <?php
+namespace LaunchDarkly;
 
 class TargetRule {
     protected $_attribute = null;

lib/LaunchDarkly/TargetRule.php renamed to src/LaunchDarkly/TargetRule.php

@@ -1,4 +1,5 @@
 <?php
+namespace LaunchDarkly;
 
 class Variation {
     protected $_value = null;

lib/LaunchDarkly/Variation.php renamed to src/LaunchDarkly/Variation.php

@@ -1,6 +1,12 @@
 <?php
+namespace LaunchDarkly\Tests;
 
-class FeatureRepTest extends PHPUnit_Framework_TestCase {
+use LaunchDarkly\FeatureRep;
+use LaunchDarkly\LDUser;
+use LaunchDarkly\TargetRule;
+use LaunchDarkly\Variation;
+
+class FeatureRepTest extends \PHPUnit_Framework_TestCase {
 
     protected $_simpleFlag   = null;
     protected $_disabledFlag = null;