Introduction to GraphQL

Introduction
Origin
History
Usage
Alternatives & useful tools
End
GraphQL
Piotr Sroczkowski
Brainhub
January 23, 2017
Piotr Sroczkowski GraphQL

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Summary I
1 Introduction
2 Origin
DIP
Semantic triple
3 History
4 Usage
How to setup a GraphQL server?
Syntax
Types
Best practices
5 Alternatives & useful tools
6 End

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What is GraphQL?

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What is GraphQL?
Graph query language

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DIP
Semantic triple
Dependency inversion principle (DIP)

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DIP
Semantic triple
one of SOLID principles

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DIP
Semantic triple
depend on abstraction, not concretion

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DIP
Semantic triple
IMO even abstract class breaks this rule

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DIP
Semantic triple
IMO even abstract class breaks this rule
so we should depend only on interfaces

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DIP
Semantic triple
DIP in services

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DIP
Semantic triple
DIP in services
DIP is not only in OOP

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DIP
Semantic triple
DIP in services
also in SOA

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DIP
Semantic triple
DIP in services
also in SOA
it’s like joining blocks together

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DIP
Semantic triple
DIP in microservices

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DIP
Semantic triple
it’s not a new paradigm, it’s just an example of SOA

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DIP
Semantic triple
it’s not a new paradigm, it’s just an example of SOA
service discovery

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DIP
Semantic triple
Semantic triple

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DIP
Semantic triple
Semantic triple
an RDF (Resouce Description Framework) data model

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DIP
Semantic triple
Semantic triple
an RDF (Resouce Description Framework) data model
ex. Alice likes Bob

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DIP
Semantic triple
Triplestore

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DIP
Semantic triple
Triplestore
a proposed database for storage of triples

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DIP
Semantic triple
Think in graphs

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DIP
Semantic triple
Think in graphs
Why?

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DIP
Semantic triple
Think in graphs
Why?
UI

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DIP
Semantic triple
Think in graphs
Why?
UI
Graph algorithms

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GraphQL history

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GraphQL history
developed internally in Facebook in 2012

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GraphQL history
developed internally in Facebook in 2012
publicly released in 2015

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Syntax
Types
Best practices
Node

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Syntax
Types
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Node
express-graphql
https://github.com/graphql/express-graphql

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Syntax
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Node
express-graphql
https://github.com/graphql/express-graphql
or graphql-server
https://github.com/apollostack/graphql-server

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Syntax
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The simplest way
1 git clone https:// github.com/apollostack/apollo -
→ starter -kit
2 cd apollo -starter -kit
3 git checkout server -only
4 npm install
5 npm start

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Syntax
Types
Best practices
Queries

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Syntax
Types
Best practices
Queries
1 {
2 hero {
3 name
4 }
5 }

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Syntax
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Queries
1 {
2 hero {
3 name
4 }
5 }
1 {
2 "data": {
3 "hero": {
4 "name": "R2 -D2"
5 }
6 }
7 }

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Syntax
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Queries
1 {
2 human(id: "1000") {
3 name
4 height
5 }
6 }

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Syntax
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Queries
1 {
2 human(id: "1000") {
3 name
4 height
5 }
6 }
1 {
2 "data": {
3 "human": {
4 "name": "Luke Skywalker",
5 "height": 1.72
6 }
7 }
8 }

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Syntax
Types
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Aliases

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Syntax
Types
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Aliases
1 {
2 empireHero: hero(episode: EMPIRE) {
3 name
4 }
5 jediHero: hero(episode: JEDI) {
6 name
7 }
8 }

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Syntax
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Aliases
1 {
2 empireHero: hero(episode: EMPIRE) {
3 name
4 }
5 jediHero: hero(episode: JEDI) {
6 name
7 }
8 }
1 {
2 "data": {
3 "empireHero": {
4 "name": "Luke Skywalker"
5 },
6 "jediHero": {
7 "name": "R2 -D2"
8 }
9 } Piotr Sroczkowski GraphQL

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Syntax
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Fragments - input
1 {
2 leftComparison: hero(episode: EMPIRE) {
3 ... comparisonFields
4 }
5 rightComparison : hero(episode: JEDI) {
6 ... comparisonFields
7 }
8 }
9
10 fragment comparisonFields on Character {
11 name
12 appearsIn
13 friends {
14 name
15 }
16 }

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Syntax
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Fragments - output I
1 {
2 "data": {
3 " leftComparison": {
4 "name": "Luke Skywalker",
5 "appearsIn": [
6 "NEWHOPE",
7 "EMPIRE",
8 "JEDI"
9 ],
10 "friends": [
11 {
12 "name": "Han Solo"
13 },
14 {
15 "name": "Leia Organa"

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Fragments - output II
16 },
17 {
18 "name": "C-3PO"
19 },
20 {
21 "name": "R2 -D2"
22 }
23 ]
24 },
25 " rightComparison ": {
26 "name": "R2 -D2",
27 "appearsIn": [
28 "NEWHOPE",
29 "EMPIRE",
30 "JEDI"
31 ],

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Fragments - output III
32 "friends": [
33 {
35 },
36 {
38 },
39 {
41 }
42 ]
43 }
44 }
45 }

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Syntax
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Variables - input I
1 query HeroNameAndFriends ($episode: Episode) {
2 hero(episode: $episode) {
3 name
4 friends {
5 name
6 }
7 }
8 }

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Syntax
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Variables - output I
1 {
2 "data": {
3 "hero": {
4 "name": "R2 -D2",
5 "friends": [
6 {
8 },
9 {
11 },
12 {
14 }
15 ]

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Syntax
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Variables - output II
16 }
17 }
18 }

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Syntax
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Directives I
1 query Hero($episode: Episode , $withFriends: Boolean !)
→ {
2 hero(episode: $episode) {
3 name
4 friends @include(if: $withFriends) {
5 name
6 }
7 }
8 }

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Syntax
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Mutations I
1 mutation CreateReviewForEpisode ($ep: Episode!, $review
→ : ReviewInput !) {
2 createReview(episode: $ep , review: $review) {
3 stars
4 commentary
5 }
6 }

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Syntax
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Inline fragments I
1 query HeroForEpisode ($ep: Episode !) {
2 hero(episode: $ep) {
3 name
4 ... on Droid {
5 primaryFunction
6 }
7 ... on Human {
8 height
9 }
10 }
11 }

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Syntax
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Meta ﬁelds I
1 {
2 search(text: "an") {
3 __typename
4 ... on Human {
5 name
6 }
7 ... on Droid {
8 name
9 }
10 ... on Starship {
11 name
12 }
13 }
14 }

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Syntax
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Types

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Syntax
Types
Best practices
Types
Scalar types

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Syntax
Types
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Types
Scalar types
Enumeration types

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Syntax
Types
Best practices
Types
Scalar types
Enumeration types
Interfaces

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Syntax
Types
Best practices
Types
Scalar types
Enumeration types
Interfaces
Union types

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Syntax
Types
Best practices
Types
Scalar types
Enumeration types
Interfaces
Union types
Input types

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Syntax
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Scalar types

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Syntax
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Scalar types
Int

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Syntax
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Scalar types
Int
Float

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Syntax
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Scalar types
Int
Float
String

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Syntax
Types
Best practices
Scalar types
Int
Float
String
Boolean

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Syntax
Types
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Scalar types
Int
Float
String
Boolean
Id

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Syntax
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Scalar types
Int
Float
String
Boolean
Id
You can also deﬁne your custom scalar types ex. scalar Date

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Syntax
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Enumeration types
1 enum Episode {
2 NEWHOPE
3 EMPIRE
4 JEDI
5 }

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Syntax
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Type modiﬁers
1 type Character {
2 name: String!
3 appearsIn: [Episode ]!
4 }

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Syntax
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Interface
1 interface Character {
2 id: ID!
3 name: String!
4 friends: [Character]
6 }

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Syntax
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Interface implementation
1 type Human implements Character {
2 id: ID!
3 name: String!
4 friends: [Character]
6 starships: [Starship]
7 totalCredits: Int
8 }

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Syntax
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Union types
1 union SearchResult = Human | Droid | Starship

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Syntax
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Input types

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Syntax
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Input types
1 input ReviewInput {
2 stars: Int!
3 commentary: String
4 }

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Syntax
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Input types
1 input ReviewInput {
2 stars: Int!
3 commentary: String
4 }
1 mutation CreateReviewForEpisode ($ep: Episode!,
→ $review: ReviewInput !) {
2 createReview(episode: $ep , review: $review)
→ {
3 stars
4 commentary
5 }
6 }

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Syntax
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Best practices

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Syntax
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Best practices
HTTP

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Syntax
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Best practices
HTTP
JSON (with GZIP)

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Syntax
Types
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Best practices
HTTP
JSON (with GZIP)
Versioning

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Syntax
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Best practices
HTTP
JSON (with GZIP)
Versioning
Nullability

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Syntax
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Best practices
HTTP
JSON (with GZIP)
Versioning
Nullability
Pagination

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Syntax
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Best practices
HTTP
JSON (with GZIP)
Versioning
Nullability
Pagination
Server-side Batching & Caching

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Syntax
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Pagination example
1 {
2 hero {
3 name
4 friends(first :2) {
5 name
6 }
7 }
8 }

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Syntax
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Batching - library

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Batching - library
https://github.com/nodkz/react-relay-network-layer

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Useful tools

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Useful tools
Relay https://github.com/facebook/relay

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Useful tools
GraphiQL https://github.com/graphql/graphiql

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Useful tools
Adrenaline https://github.com/gyzerok/adrenaline

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Useful tools
Apollo client
https://github.com/apollostack/apollo-client

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Useful tools
Apollo client
https://github.com/apollostack/apollo-client
Apollo iOS
https://github.com/apollostack/apollo-ios

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Alternatives

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Alternatives
Falcor (not yet available)

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Alternatives
SPARQL

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Alternatives
SPARQL
Graph databases like Neo4j, ArangoDB

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What problems does it solve?

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client - server and microservices communication

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more precise than REST

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more precise than REST
versioning

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Sources

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Sources
The examples have been got from GraphQL oﬃcial site
http://graphql.org/learn/

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The end

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The end
Thank you

Introduction to GraphQL

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