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<?php |
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namespace Fathomminds\Rest\Database\DynamoDb; |
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use Aws\DynamoDb\Marshaler; |
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use Fathomminds\Rest\Exceptions\RestException; |
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use Fathomminds\Rest\Objects\RestObject as CoreRestObject; |
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use GuzzleHttp\Promise as PromiseFunctions; |
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use GuzzleHttp\Promise\Promise as Promise; |
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class RestObject extends CoreRestObject |
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{ |
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protected $primaryKey = '_id'; |
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protected $databaseClass = Database::class; |
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protected $indexNames = []; |
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public function validateUniqueFields() |
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{ |
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$uniqueFields = $this->getUniqueFields(); |
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$uniqueFields = array_diff($uniqueFields, [$this->primaryKey]); //Secondary indexes only |
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if ($this->allUniqueFieldHasIndex($uniqueFields)) { |
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return $this->queryUniqueFields($uniqueFields); |
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} |
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return $this->scanUniqueFields($uniqueFields); |
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} |
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protected function allUniqueFieldHasIndex($fields) |
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{ |
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$indexes = array_keys($this->indexNames); |
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$existingFields = array_keys(get_object_vars($this->resource)); |
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$uniqueAndSet = array_diff( |
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array_intersect($fields, $existingFields), //Is unique and value is set |
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[$this->primaryKey] //Collect only secondary indexes |
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); |
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$uniqueAndSetAndIndexed = array_intersect($uniqueAndSet, $indexes); //Is unique and value is set and is indexed |
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sort($uniqueAndSet); |
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sort($uniqueAndSetAndIndexed); |
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return $uniqueAndSet===$uniqueAndSetAndIndexed; |
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} |
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protected function scanUniqueFields($fields) |
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{ |
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$client = $this->getClient(); |
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$query = new Scan($client, $this->generateScan($fields)); |
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while ($res = $query->next()) { |
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if ($res !== null && $res['Count'] !== 0) { |
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throw new RestException( |
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'Unique constraint violation', |
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[ |
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'resourceName' => $this->resourceName, |
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'confilct' => $res, |
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'mode' => 'scan', |
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] |
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); |
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} |
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} |
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} |
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protected function generateScan($fields) |
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{ |
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$filter = $this->generateScanFilter($fields); |
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if (property_exists($this->resource, $this->primaryKey)) { |
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$marshaler = new Marshaler; |
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$filter['FilterExpression'] = '('.$filter['FilterExpression'].') AND #pk<>:pk'; |
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$filter['ExpressionAttributeNames']['#pk'] = $this->primaryKey; |
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$filter['ExpressionAttributeValues'][':pk'] = $marshaler->marshalValue( |
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$this->resource->{$this->primaryKey} |
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); |
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} |
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return [ |
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'TableName' => $this->database->getDatabaseName() . '-' . $this->resourceName, |
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'FilterExpression' => $filter['FilterExpression'], |
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'ExpressionAttributeNames' => $filter['ExpressionAttributeNames'], |
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'ExpressionAttributeValues' => $filter['ExpressionAttributeValues'], |
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]; |
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} |
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protected function generateScanFilter($fields) |
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{ |
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$marshaler = new Marshaler; |
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$ret = [ |
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'FilterExpression' => '', |
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'ExpressionAttributeNames' => [], |
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'ExpressionAttributeValues' => [], |
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]; |
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foreach ($fields as $field) { |
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if (property_exists($this->resource, $field)) { |
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$ret['FilterExpression'] .= '#'.$field.'=:'.$field.' OR '; |
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$ret['ExpressionAttributeNames']['#'.$field] = $field; |
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$ret['ExpressionAttributeValues'][':'.$field] = $marshaler->marshalValue( |
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$this->resource->{$field} |
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); |
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} |
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} |
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$ret['FilterExpression'] = trim($ret['FilterExpression'], ' OR '); |
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return $ret; |
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} |
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protected function queryUniqueFields($fields) |
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{ |
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$queries = $this->generateQueries($fields); |
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$promises = $this->generatePromises($queries); |
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$results = PromiseFunctions\unwrap($promises); |
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foreach ($results as $result) { |
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if ($result !== null && $result['Count'] !== 0) { |
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throw new RestException( |
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'Unique constraint violation', |
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[ |
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'resourceName' => $this->resourceName, |
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'confilct' => $result, |
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'mode' => 'query', |
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] |
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); |
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} |
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} |
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} |
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protected function generateQueries($fields) |
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{ |
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$queries = []; |
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foreach ($fields as $field) { |
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if (property_exists($this->resource, $field)) { |
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$queries[] = $this->generateQuery($field); |
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} |
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} |
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return $queries; |
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} |
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protected function generateQuery($field) |
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{ |
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$marshaler = new Marshaler; |
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$query = [ |
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'TableName' => $this->database->getDatabaseName() . '-' . $this->resourceName, |
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'KeyConditionExpression' => '#'.$field.'=:'.$field, |
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'IndexName' => $this->indexNames[$field], |
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'ExpressionAttributeNames' => ['#'.$field => $field], |
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'ExpressionAttributeValues' => [':'.$field => $marshaler->marshalValue( |
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$this->resource->{$field} |
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)], |
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]; |
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if (property_exists($this->resource, $this->primaryKey)) { |
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$query['FilterExpression'] = '#pk<>:pk'; |
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$query['ExpressionAttributeNames']['#pk'] = $this->primaryKey; |
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$query['ExpressionAttributeValues'][':pk'] = $marshaler->marshalValue( |
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$this->resource->{$this->primaryKey} |
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); |
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} |
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return $query; |
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} |
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protected function generatePromises($queries) |
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{ |
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$client = $this->getClient(); |
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$promises = []; |
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foreach ($queries as $query) { |
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$promises[] = $this->generatePromise($client, $query); |
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} |
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return $promises; |
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} |
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protected function generatePromise($client, $query) |
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{ |
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$promise = new Promise( |
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function () use (&$promise, $client, $query) { |
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$q = new Query($client, $query); |
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while ($res = $q->next()) { |
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if ($res['Count'] !== 0) { |
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$promise->resolve($res); |
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return; |
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} |
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} |
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$promise->resolve(null); |
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} |
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); |
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return $promise; |
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} |
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} |
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fathomminds /
php-rest-models
