mirror of
https://github.com/retailcrm/graphql-php.git
synced 2024-11-28 15:56:02 +03:00
95 lines
3.3 KiB
Markdown
95 lines
3.3 KiB
Markdown
# Query Complexity Analysis
|
|
|
|
This is a PHP port of [Query Complexity Analysis](http://sangria-graphql.org/learn/#query-complexity-analysis) in Sangria implementation.
|
|
|
|
Complexity analysis is a separate validation rule which calculates query complexity score before execution.
|
|
Every field in the query gets a default score 1 (including ObjectType nodes). Total complexity of the
|
|
query is the sum of all field scores. For example, the complexity of introspection query is **109**.
|
|
|
|
If this score exceeds a threshold, a query is not executed and an error is returned instead.
|
|
|
|
Complexity analysis is disabled by default. To enabled it, add validation rule:
|
|
|
|
```php
|
|
<?php
|
|
use GraphQL\GraphQL;
|
|
use GraphQL\Validator\Rules\QueryComplexity;
|
|
use GraphQL\Validator\DocumentValidator;
|
|
|
|
$rule = new QueryComplexity($maxQueryComplexity = 100);
|
|
DocumentValidator::addRule($rule);
|
|
|
|
GraphQL::executeQuery(/*...*/);
|
|
```
|
|
This will set the rule globally. Alternatively, you can provide validation rules [per execution](executing-queries.md#custom-validation-rules).
|
|
|
|
To customize field score add **complexity** function to field definition:
|
|
```php
|
|
<?php
|
|
use GraphQL\Type\Definition\Type;
|
|
use GraphQL\Type\Definition\ObjectType;
|
|
|
|
$type = new ObjectType([
|
|
'name' => 'MyType',
|
|
'fields' => [
|
|
'someList' => [
|
|
'type' => Type::listOf(Type::string()),
|
|
'args' => [
|
|
'limit' => [
|
|
'type' => Type::int(),
|
|
'defaultValue' => 10
|
|
]
|
|
],
|
|
'complexity' => function($childrenComplexity, $args) {
|
|
return $childrenComplexity * $args['limit'];
|
|
}
|
|
]
|
|
]
|
|
]);
|
|
```
|
|
|
|
# Limiting Query Depth
|
|
|
|
This is a PHP port of [Limiting Query Depth](http://sangria-graphql.org/learn/#limiting-query-depth) in Sangria implementation.
|
|
For example, max depth of the introspection query is **7**.
|
|
|
|
It is disabled by default. To enable it, add following validation rule:
|
|
|
|
```php
|
|
<?php
|
|
use GraphQL\GraphQL;
|
|
use GraphQL\Validator\Rules\QueryDepth;
|
|
use GraphQL\Validator\DocumentValidator;
|
|
|
|
$rule = new QueryDepth($maxDepth = 10);
|
|
DocumentValidator::addRule($rule);
|
|
|
|
GraphQL::executeQuery(/*...*/);
|
|
```
|
|
|
|
This will set the rule globally. Alternatively, you can provide validation rules [per execution](executing-queries.md#custom-validation-rules).
|
|
|
|
# Disabling Introspection
|
|
[Introspection](http://graphql.org/learn/introspection/) is a mechanism for fetching schema structure.
|
|
It is used by tools like GraphiQL for auto-completion, query validation, etc.
|
|
|
|
Introspection is enabled by default. It means that anybody can get a full description of your schema by
|
|
sending a special query containing meta fields **__type** and **__schema** .
|
|
|
|
If you are not planning to expose your API to the general public, it makes sense to disable this feature.
|
|
|
|
GraphQL PHP provides you separate validation rule which prohibits queries that contain
|
|
**__type** or **__schema** fields. To disable introspection, add following rule:
|
|
|
|
```php
|
|
<?php
|
|
use GraphQL\GraphQL;
|
|
use GraphQL\Validator\Rules\DisableIntrospection;
|
|
use GraphQL\Validator\DocumentValidator;
|
|
|
|
DocumentValidator::addRule(new DisableIntrospection());
|
|
|
|
GraphQL::executeQuery(/*...*/);
|
|
```
|
|
This will set the rule globally. Alternatively, you can provide validation rules [per execution](executing-queries.md#custom-validation-rules).
|