GraphQL at Twitter

Transcript

1. George Leontiev AgentConf — February 2019
2. George Leontiev @YukiFartlek
6. Datastorage Thrift HTTP
7. HTTP Thrift Datastorage
8. HTTP Thrift Datastorage
10. HTTP Thrift GraphQL API
11. Schema
13. A federated database brings together multiple data sources so that they can be queried and mutated uniformly.
14. GraphQL brings together multiple data sources so that they can be queried and mutated uniformly.
15. Strato brings together multiple data sources so that they can be queried and mutated uniformly.
16. Column({ name = "User/birthday", source = DbColumn({ dest = "twitter_db", dataset = "birthdays", mapping = KeyValue({ key = Type(Long), // User ID value = Type(Long) // Timestamp }) }) })
17. Column({ name = "User/birthday", source = DbColumn({ dest = "twitter_db", dataset = "birthdays", mapping = KeyValue({ key = Type(Long), // User ID value = Type(Long) // Timestamp }) }), graphql = Field("User", "birthday") })
18. Subscriptions
20. Clients subscribe to an event with a GraphQL query and receive payloads. — Laney Kuenzel
21. Clients subscribe to an event with a GraphQL query and receive payloads.
22. Subscriptions EventBus Event Producer
23. Clients subscribe to an event with a GraphQL query and receive payloads.
24. def execute( query, against: Event, as: User ): Payload
25. { "query": "subscription { random_tweet { id } }", "event": { "type": "random_tweet", "tweet_id": "..." }, "user": { "id": "12" } }
26. API EventBus Event Producer Subscriptions
27. Clients subscribe to an event with a GraphQL query and receive payloads.
29. Live Pipeline { "topic": "tweet_engagement/20", "payload": { ... } } POST /subscribe?topic= tweet_engagement/20
30. def topic( query, for: User ): String
31. subscription { random_tweet { __typename ... on Status { topic } ... on Tweet { id text } } } { "data": { "random_tweet": { "__typename": "Status", "topic": "graphql/sM_xI92k" } } }
32. { "topic": "graphql/sM_xI92k", "payload": { "data": { "random_tweet": { "__typename": "Tweet", "id": "...", "text": "..." } } } } POST /subscribe?topic= graphql/sM_xI92k Live Pipeline
33. Subscriptions API Live Pipeline EventBus subscription { random_tweet { ... } } { "topic": "graphql/sM_xI92k", "payload": { "data": { "random_tweet": { ... } } } } { "random_tweet_id": "..." } { ... "topic": "graphql/sM_xI92k" ... } Event Producer
34. Tips
38. { user(id: "12") { name followers { name followers { name followers { name followers { name } } } } } }
39. POST /graphql/eyBuaWNlIHsgdHJ5IH0gfQ
40. enabling technology noun An invention or innovation, that can be applied to drive radical change in the capabilities of a user or culture. Enabling technologies are characterized by rapid development of subsequent derivative technologies, often in diverse fields.
41. adjacent possible noun A kind of shadow future, hovering on the edges of the present state of things, a map of all the ways in which the present can reinvent itself.
43. George Leontiev @YukiFartlek