Add logGroupName and logStreamName, rename memorySize -> memoryLimitInMB

Implements changes suggested in #3

Author: thekid

ChangeLog.md

@@ -3,6 +3,10 @@ AWS Lambda change log
 
 ## ?.?.? / ????-??-??
 
+* Fixed issue #3: Context object compatibility. Context now also declares
+  the properties *logGroupName* and *logStreamName* like in NodeJS, and
+  uses *memoryLimitInMB* instead of *memorySize*.
+  (@thekid)
 * Merged PR #4: Pass version along to docker images. Use `xp lambda runtime`
   to use the current PHP version, `xp lambda runtime:8.0` to use the newest
   PHP 8.0 release, and `xp lambda runtime:8.0.10` for version pinning.

README.md

@@ -154,6 +154,8 @@ public class com.amazon.aws.lambda.Context implements lang.Value {
   public string $functionName
   public string $functionVersion
   public string $memorySize
+  public string $logGroupName
+  public string $logStreamName
   public string $region
   public int $payloadLength
 

src/main/php/com/amazon/aws/lambda/Context.class.php

@@ -13,7 +13,7 @@
  */
 class Context implements Value {
   public $awsRequestId, $invokedFunctionArn, $traceId, $clientContext, $cognitoIdentity, $deadline;
-  public $functionName, $functionVersion, $memorySize, $region;
+  public $functionName, $functionVersion, $memoryLimitInMB, $logGroupName, $logStreamName, $region;
   public $payloadLength;
 
   /**
@@ -31,8 +31,10 @@ public function __construct(array $headers, array $environment= []) {
     $this->cognitoIdentity= $headers['Lambda-Runtime-Cognito-Identity'][0] ?? null;
     $this->functionName= $environment['AWS_LAMBDA_FUNCTION_NAME'] ?? 'test';
     $this->functionVersion= $environment['AWS_LAMBDA_FUNCTION_VERSION'] ?? '$LATEST';
-    $this->memorySize= $environment['AWS_LAMBDA_FUNCTION_MEMORY_SIZE'] ?? '1536';
+    $this->memoryLimitInMB= $environment['AWS_LAMBDA_FUNCTION_MEMORY_SIZE'] ?? '1536';
     $this->region= $environment['AWS_REGION'] ?? 'us-east-1';
+    $this->logGroupName= $environment['AWS_LAMBDA_LOG_GROUP_NAME'] ?? null;
+    $this->logStreamName= $environment['AWS_LAMBDA_LOG_STREAM_NAME'] ?? null;
     $this->payloadLength= cast($headers['Content-Length'][0] ?? null, '?int');
   }
 
@@ -53,7 +55,9 @@ public function toString() {
       "  [deadline          ] %s\n".
       "  [functionName      ] %s\n".
       "  [functionVersion   ] %s\n".
-      "  [memoryLimit       ] %s\n".
+      "  [memoryLimitInMB   ] %s\n".
+      "  [logGroupName      ] %s\n".
+      "  [logStreamName     ] %s\n".
       "  [region            ] %s\n".
       "  [clientContext     ] %s\n".
       "  [identity          ] %s\n".
@@ -66,7 +70,9 @@ public function toString() {
       $this->deadline ?? '(null)',
       $this->functionName,
       $this->functionVersion,
-      $this->memoryLimit,
+      $this->memoryLimitInMB,
+      $this->logGroupName ?? '(null)',
+      $this->logStreamName ?? '(null)',
       $this->region,
       $this->clientContext ?? '(null)',
       $this->identity ?? '(null)'

src/test/php/com/amazon/aws/lambda/unittest/ContextTest.class.php

@@ -16,6 +16,8 @@ class ContextTest {
     'AWS_LAMBDA_FUNCTION_NAME'        => 'test',
     'AWS_LAMBDA_FUNCTION_VERSION'     => '$LATEST',
     'AWS_LAMBDA_FUNCTION_MEMORY_SIZE' => 1536,
+    'AWS_LAMBDA_LOG_GROUP_NAME'       => '/aws/lambda/test',
+    'AWS_LAMBDA_LOG_STREAM_NAME'      => '2021/08/27/[$LATEST]17c13f63daf4a2a178be63f5531f77cc',
     'AWS_REGION'                      => 'us-east-1',
   ];
 
@@ -32,7 +34,9 @@ private function headers() {
   private function environment() {
     yield ['AWS_LAMBDA_FUNCTION_NAME', 'functionName'];
     yield ['AWS_LAMBDA_FUNCTION_VERSION', 'functionVersion'];
-    yield ['AWS_LAMBDA_FUNCTION_MEMORY_SIZE', 'memorySize'];
+    yield ['AWS_LAMBDA_FUNCTION_MEMORY_SIZE', 'memoryLimitInMB'];
+    yield ['AWS_LAMBDA_LOG_GROUP_NAME', 'logGroupName'];
+    yield ['AWS_LAMBDA_LOG_STREAM_NAME', 'logStreamName'];
     yield ['AWS_REGION', 'region'];
   }
 
@@ -75,4 +79,12 @@ public function remainingTime_accessor() {
       round((new Context($this->headers))->remainingTime(1629390002.279), 1)
     );
   }
+
+  #[Test]
+  public function string_representation_is_not_empty() {
+    Assert::notEquals(
+      '',
+      (new Context($this->headers, $this->environment))->toString()
+    );
+  }
 }