GraphQL QueryComplexityLimiter queryComplexity is set too low value and queryDepth probably too high

[paales]

Preconditions (*)

1. Magento 2.4.2

Steps to reproduce (*)

I'm trying to fetch all product information for the product page in one go:

• All product information and relevant attributes
• All upsells/related products with specific fields for each product type
• Etc.

When I run this query I get an error: Max query complexity should be 300 but got 388.

Expected result (*)

I'm not doing anything super special and I would expect this to succeed. Especially since the workaround is that I need to make two calls to the Magento backend which will invariably cause more load for the server.

Actual result (*)

The current complexity limit is set to 300:

magento2/app/code/Magento/GraphQl/etc/di.xml

Lines 102 to 103 in 3ad7a1d

	<argument name="queryDepth" xsi:type="number">20</argument>
	<argument name="queryComplexity" xsi:type="number">300</argument>

There currently is a test set to validate that it isn't more than 300:

magento2/dev/tests/api-functional/testsuite/Magento/GraphQl/Framework/QueryComplexityLimiterTest.php

Line 398 in 3ad7a1d

self::expectExceptionMessageMatches('/Max query complexity should be 300 but got 302/');

It seems that the queryDepth here is set relatively high, but the queryComplexity is set relatively low.

Proposed solution

Apollo

If we read this security post from Apollo https://www.apollographql.com/blog/securing-your-graphql-api-from-malicious-queries-16130a324a6b/, it seems more sensible values would be:

• queryComplexity: 750
• queryDepth: 10

graphql-query-complexity library

If we follow the defaults mentioned here: https://github.com/slicknode/graphql-query-complexity/blob/95e2899dd9bc32600114dd04bef5996ceeba0f4a/README.md#usage, we get:

• queryComplexity: 1000

Hasura

Hasura doesn't even offer queryComplexity limits they only offer queryDepth limits:

https://hasura.io/docs/latest/graphql/cloud/api-limits.html#configuring-an-api-limit

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[m2-assistant]

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed after 14 days if no further activity occurs. Is this issue still relevant? If so, what is blocking it? Is there anything you can do to help move it forward? Thank you for your contributions!

[paales]

This isn't stale

[m2-assistant]

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[engcom-Lima]

Hi @paales ,

default query complexity and depth thresholds are configurable via the magento2/app/code/Magento/GraphQl/etc/di.xml file.
20
300

So you are free to adjust these values as deemed fit for your environment. This is the current approach we advocate to users and will have improved in the upcoming 2.4.3 release.

Thanks

[paales]

@engcom-Lima Thanks for the suggestion to modify those values! Changing the defaults would still make sense, right? Or is that what you mentioned for 2.4.3?

[bloodf]

This needs to be put in the core, we can have the configuration as it is. Doing an integration or consuming the GraphQL right now, makes the usage of the API totally worthless.

[hnsr]

@engcom-Lima Can you elaborate on the improvements for 2.4.3? I'm currently on this version, and still find myself running into the queryComplexity limit that seems to be set to 300.

For our application to remain compatible with standard Magento (that is, without requiring one to change the default limits through DI customisation) this would require splitting up such queries, which only introduces more overhead and takes away one of the benefits of GraphQL

[joshdavenport]

300 is still set as the default query complexity limit. This really ought to be assessed.

2.4-develop

magento2/app/code/Magento/GraphQl/etc/di.xml

Line 104 in 647b34e

<argument name="queryComplexity" xsi:type="number">300</argument>

2.5-develop

magento2/app/code/Magento/GraphQl/etc/di.xml

Line 103 in 6ac4cda

<argument name="queryComplexity" xsi:type="number">300</argument>

It's not difficult to change in a project, but also not difficult to set a more reasonable default that reduces the chance of devs chasing their tails because of this.