1.
GraphQL on ASP.NET Core
WITH

2.
Who are we?

3.
Who is this for?Who is this for?

4.
demo.chillicream.com

5.
query {
me {
name
age
}
}
{
"me": {
"name": "Foo",
"age": 99
}
}

6.
GET
https://webservices.amazon.com/onca/xml?
Service=AWSECommerceService&
AWSAccessKeyId=mY-Sup3r-s3cr3!-k3y&
AssociateTag=12345&
Operation=ItemLookup&
ItemId=0316067938&
ResponseGroup=Reviews&
TruncateReviewsAt=256&
IncludeReviewsSummary=False&
Version=2013-08-01&
Timestamp=[YYYY-MM-DDThh:mm:ssZ]&
Signature=[Request Signature]

7.
What is GraphQL?

8.
GraphQL
No over- or under-fetching
One Request
Type System
No versioning
Simplicity
One Endpoint
Documentation
Real-time
Predictability

9.
What GraphQL is not:
• Graph database query language
• Solution for binary streams
• Facebooks version of OData
• Bound to a specific data source
• Limited to HTTP
• Limited to the JavaScript world
• A good solution for a health
check endpoint.

10.
REST GraphQL
Shared Definition No Yes
Conceptual Model Resources Graphs
Organization Federated Centralized
Related Ops Yes No
Introspection No Yes
Data Typing Weak Strong
Real-Time No Yes

11.
GraphQL Operations:
• Query = Read
• Mutation = Write
• Subscription = Events

12.
Demo

13.
Resolvers and Pipelines

14.
Demo

15.
query {
me {
friends {
friends {
friends {
name
}
}
}
}
}

16.
Demo

17.
Scaling Your Graph

18.
query {
me {
name
age
}
}

19.
query {
me {
name
age
friends {
name
age
}
}
}

20.
query {
me {
friends {
friends {
friends {
name
}
}
}
}
}

21.
query {
me {
name
stories(first: 10) {
... Content
}
}
}

22.
query {
me {
name
stories(first: 10000) {
... Content
}
}
}

23.
type User {
stories(first: PaginationAmount): [Story!]!
}
SchemaBuilder.New()
.AddType(new PaginationAmountType(50))
...
.Create();
type User {
stories(first: Int): [Story!]!
}

24.
type User {
stories(first: PaginationAmount): [Story!]!
@cost(complexity: 5)
}

25.
type User {
stories(first: PaginationAmount): [Story!]!
@cost(complexity: 5 multipliers:[first])
}

26.
1
1 50
me
Stories(first: 10)name

27.
1
1 5000
me
Stories(first: 1000)name

28.
Demo

29.
Persisted Queries

30.
GraphQL Client GraphQL Server
High Bandwidth Usage
{
"query" : <query>
}

31.
GraphQL Client GraphQL Server
Unrestricted Query Execution
{
"query" : <query>
}

32.
GraphQL Client GraphQL Server
Low Bandwidth Usage
{
“id” : “W5IYenw==”
}
Middleware

33.
GraphQL Client GraphQL Server
Restricted Query Execution
{
“id” : “W5IYenw==”
}
Middleware

34.
Demo

35.
Testing Your Schema

36.
Demo

37.
How can we do microservices with
that?

38.
What is
schema
stitching?

39.
The capability to merge multiple
GraphQL schemas into one
schema.

40.
Hot Chocolate Gateway
Hot Chocolate GraphQL
Mongo DBRaven DB
Abritray REST Endpoint
{REST}
SQL Server
query {
me {
messages {
# Hot Chocolate GraphQL
text
# Apollo Server
createdBy {
name
}
# Abritray REST Endpoint
views
likes
replies
}
}
}
One GraphQL Query
Apollo GraphQL

41.
Demo

42.
Where do you find us?
https://github.com/ChilliCream
https://chillicream.com
https://hotchocolate.io
https://twitter.com/Chilli_Cream