Added logger as YDB config

Author: Илья

src/Ydb.php

@@ -107,7 +107,11 @@ public function __construct($config = [], LoggerInterface $logger = null)
         $this->database = $config['database'] ?? null;
         $this->iam_config = $config['iam_config'] ?? [];
 
-        if ($logger){
+        if (!is_null($logger) && isset($config['logger'])){
+            throw new \Exception('Logger set in 2 places');
+        } else if (isset($config['logger']) && $config['logger'] instanceof LoggerInterface) {
+            $this->logger = $config['logger'];
+        } else if ($logger) {
             $this->logger = $logger;
         } else {
             $this->logger = new NullLogger();
@@ -351,4 +355,12 @@ public function discoveryInterval()
     {
         return $this->discoveryInterval;
     }
+
+    /**
+     * @return LoggerInterface|NullLogger
+     */
+    public function getLogger()
+    {
+        return $this->logger;
+    }
 }

tests/LoggerCheckTest.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace YdbPlatform\Ydb\Test;
+
+use PHPUnit\Framework\TestCase;
+use YdbPlatform\Ydb\Logger\NullLogger;
+use YdbPlatform\Ydb\Logger\SimpleStdLogger;
+use YdbPlatform\Ydb\Ydb;
+
+class LoggerCheckTest extends TestCase{
+
+    public function testExceptExceptionInConfigs(){
+        $config = [
+            'logger' => new SimpleStdLogger(7)
+        ];
+        $this->expectException('Exception');
+        new Ydb($config, new NullLogger());
+    }
+    public function testCheckUseLoggerFromConfig(){
+        $logger = new SimpleStdLogger(7);
+        $config = [
+            'logger' => $logger
+        ];
+        $ydb = new Ydb($config);
+        $this->assertEquals($logger, $ydb->getLogger());
+    }
+    public function testCheckUseLoggerFromParam(){
+        $logger = new SimpleStdLogger(7);
+        $config = [];
+        $ydb = new Ydb($config, $logger);
+        $this->assertEquals($logger, $ydb->getLogger());
+    }
+    public function testCheckUseNullLogger(){
+        $config = [];
+        $ydb = new Ydb($config);
+        $this->assertInstanceOf(NullLogger::class, $ydb->getLogger());
+    }
+}