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<?php |
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namespace Fathomminds\Rest\Database\DynamoDb; |
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use Aws\Sdk; |
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use Aws\DynamoDb\DynamoDbClient as Client; |
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use Aws\DynamoDb\Marshaler; |
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use Fathomminds\Rest\Exceptions\RestException; |
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use Fathomminds\Rest\Contracts\IResource; |
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use Fathomminds\Rest\Helpers\Uuid; |
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use Aws\DynamoDb\Exception\DynamoDbException; |
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class Resource implements IResource |
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{ |
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protected $client; |
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protected $databaseName; |
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protected $collection; |
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protected $fullTableName; |
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protected $resourceName; |
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protected $primaryKey; |
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protected $marshaler; |
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public function __construct($resourceName, $primaryKey, Client $client = null, $databaseName = null) |
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{ |
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$this->resourceName = $resourceName; |
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$this->primaryKey = $primaryKey; |
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$this->client = $client === null ? $this->createClient() : $client; |
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$this->databaseName = $databaseName === null ? $this->getFullDatabaseName() : $databaseName; |
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$this->fullTableName = $this->databaseName . '-' . $this->resourceName; |
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$this->marshaler = new Marshaler; |
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} |
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private function createClient() |
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{ |
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$sdk = new Sdk([ |
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'region' => getenv('AWS_SDK_REGION'), |
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'version' => getenv('AWS_SDK_VERSION'), |
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'http' => [ |
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'verify' => getenv('AWS_SDK_HTTP_VERIFY') === 'false' ? false : getenv('AWS_SDK_HTTP_VERIFY'), |
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] |
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]); |
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return $sdk->createDynamoDb(); |
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} |
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private function getFullDatabaseName() |
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{ |
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return getenv('AWS_DYNAMODB_NAMESPACE') . '-' . getenv('AWS_DYNAMODB_DATABASE'); |
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} |
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public function get($resourceId = null) |
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{ |
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if ($resourceId !== null) { |
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return $this->getOne($resourceId); |
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} |
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return $this->getAll(); |
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} |
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protected function getOne($resourceId) |
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{ |
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$query = $this->createGetQuery($resourceId); |
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$res = $this->client->getItem($query); |
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return $this->unmarshalItem($res['Item']); |
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} |
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protected function createGetQuery($resourceId) |
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{ |
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$query = [ |
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'TableName' => $this->fullTableName, |
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'Key' => $this->marshalItem([$this->primaryKey => $resourceId]), |
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]; |
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return $query; |
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} |
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protected function getAll() |
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{ |
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$query = $this->createScanQuery(); |
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$res = $this->client->scan($query); |
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return $this->unmarshalBatch($res['Items']); |
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} |
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protected function createScanQuery() |
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{ |
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$query = [ |
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'TableName' => $this->fullTableName, |
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]; |
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return $query; |
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} |
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public function post($newResource) |
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{ |
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try { |
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$query = $this->createPostQuery($newResource); |
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$res = $this->client->putItem($query); |
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return $newResource; |
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} catch (DynamoDbException $ex) { |
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if ($ex->getAwsErrorCode() === 'ConditionalCheckFailedException') { |
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throw new RestException( |
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'Primary key collision', |
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['exception' => $ex] |
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); |
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} |
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throw new RestException($ex->getMessage(), ['exception' => $ex]); |
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} catch (\Exception $ex) { |
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throw new RestException($ex->getMessage(), ['exception' => $ex]); |
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} |
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} |
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protected function createPostQuery($newResource) |
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{ |
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$query = [ |
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'TableName' => $this->fullTableName, |
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'Item' => $this->marshalItem($newResource), |
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'ConditionExpression' => 'attribute_not_exists(#pk)', |
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"ExpressionAttributeNames" => ["#pk" => $this->primaryKey], |
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]; |
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return $query; |
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} |
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public function put($resourceId, $newResource) |
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{ |
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try { |
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$newResource->{$this->primaryKey} = $resourceId; |
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$query = $this->createPutQuery($newResource); |
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$res = $this->client->putItem($query); |
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return $newResource; |
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} catch (DynamoDbException $ex) { |
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if ($ex->getAwsErrorCode() === 'ConditionalCheckFailedException') { |
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throw new RestException( |
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'Resource does not exist', |
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['exception' => $ex] |
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); |
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} |
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throw new RestException($ex->getMessage(), ['exception' => $ex]); |
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} catch (\Exception $ex) { |
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throw new RestException($ex->getMessage(), ['result'=>empty($res)?null:$res]); |
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} |
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} |
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protected function createPutQuery($newResource) |
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{ |
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$query = [ |
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'TableName' => $this->fullTableName, |
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'Item' => $this->marshalItem($newResource), |
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'ConditionExpression' => 'attribute_exists(#pk)', |
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"ExpressionAttributeNames" => ["#pk" => $this->primaryKey], |
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]; |
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return $query; |
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} |
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public function delete($resourceId) |
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{ |
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try { |
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$query = $this->createDeleteQuery($resourceId); |
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$res = $this->client->deleteItem($query); |
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return $resourceId; |
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} catch (\Exception $ex) { |
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throw new RestException($ex->getMessage(), ['result'=>empty($res)?null:$res]); |
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} |
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} |
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protected function createDeleteQuery($resourceId) |
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{ |
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$query = [ |
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'TableName' => $this->fullTableName, |
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'Key' => $this->marshalItem([$this->primaryKey => $resourceId]), |
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]; |
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return $query; |
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} |
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protected function marshalItem($resource) |
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{ |
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return $this->marshaler->marshalItem($resource); |
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} |
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protected function unmarshalItem($item, $mapAsObject = true) |
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{ |
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if ($item === null) { |
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return new \StdClass; |
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} |
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return $this->marshaler->unmarshalItem($item, $mapAsObject); |
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} |
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protected function unmarshalBatch($itemList, $mapAsObject = true) |
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{ |
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if ($itemList === null) { |
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return []; |
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} |
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$list = []; |
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foreach ($itemList as $item) { |
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$list[] = $this->unmarshalItem($item, $mapAsObject); |
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} |
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return $list; |
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} |
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} |
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This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVar
assignment in line 1 and the$higher
assignment in line 2 are dead. The first because$myVar
is never used and the second because$higher
is always overwritten for every possible time line.