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TechLunch #16: GraphQL (25/10/2017)

October 25, 2017

Warning: theses notes are published raw, without any rewriting.
Attention: ces notes sont publiées telles quelles, sans retraitement particulier.

Talk #1: Présentation

GraphQL version-free: only add fields, never remove non-nullable fields.

Cache : prefer application cache than network cache.

Security : indépendant from GraphQL.

About DoS: do a cost analysis before executing the query. Cap lists to a maximum. We can also create a query whitelist (persisted queries)

Monitoring : Apollo Engine

Documentation : generated from schema

Easy to PoC, hard to prod.

Talk #2 GraphQL real-time with subscriptions

SubscriptionServer/SubscriptionClient

Real-time over GraphQL. Use PubSub.

Talk #3: GraphQL JS and dataloader

3 layers

  • presentation: web server port, login, user security (logged), dispatch GraphQL queries to business classes
  • business: create returned objects, check business rules (does the user has access? What fields can he view?)
  • data access: DB access, FS access, etc

http://knexjs.org/

Problem: each query by ID is separated from the others. Called N+1 problem.

Solution: add a dataloader layer between data access and business

https://github.com/facebook/dataloader

One dataloader per user.


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