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GraphQL at Twitter
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George Leontiev
February 21, 2019
Technology
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GraphQL at Twitter
George Leontiev
February 21, 2019
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Transcript
George Leontiev AgentConf — February 2019
George Leontiev @YukiFartlek
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Datastorage Thrift HTTP
HTTP Thrift Datastorage
HTTP Thrift Datastorage
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HTTP Thrift GraphQL API
Schema
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A federated database brings together multiple data sources so that
they can be queried and mutated uniformly.
GraphQL brings together multiple data sources so that they can
be queried and mutated uniformly.
Strato brings together multiple data sources so that they can
be queried and mutated uniformly.
Column({ name = "User/birthday", source = DbColumn({ dest = "twitter_db",
dataset = "birthdays", mapping = KeyValue({ key = Type(Long), // User ID value = Type(Long) // Timestamp }) }) })
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") })
Subscriptions
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Clients subscribe to an event with a GraphQL query and
receive payloads. — Laney Kuenzel
Clients subscribe to an event with a GraphQL query and
receive payloads.
Subscriptions EventBus Event Producer
Clients subscribe to an event with a GraphQL query and
receive payloads.
def execute( query, against: Event, as: User ): Payload
{ "query": "subscription { random_tweet { id } }", "event":
{ "type": "random_tweet", "tweet_id": "..." }, "user": { "id": "12" } }
API EventBus Event Producer Subscriptions
Clients subscribe to an event with a GraphQL query and
receive payloads.
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Live Pipeline { "topic": "tweet_engagement/20", "payload": { ... } }
POST /subscribe?topic= tweet_engagement/20
def topic( query, for: User ): String
subscription { random_tweet { __typename ... on Status { topic
} ... on Tweet { id text } } } { "data": { "random_tweet": { "__typename": "Status", "topic": "graphql/sM_xI92k" } } }
{ "topic": "graphql/sM_xI92k", "payload": { "data": { "random_tweet": { "__typename":
"Tweet", "id": "...", "text": "..." } } } } POST /subscribe?topic= graphql/sM_xI92k Live Pipeline
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
Tips
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None
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{ user(id: "12") { name followers { name followers {
name followers { name followers { name } } } } } }
POST /graphql/eyBuaWNlIHsgdHJ5IH0gfQ
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.
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.
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George Leontiev @YukiFartlek
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