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![imagesimages(1)
priceprice
titletitle
[
]
description
GET /products
...
info
{
}](https://image.slidesharecdn.com/sangria-graphqlapisinscala-180421083647/75/GraphQL-APIs-in-Scala-with-Sangria-8-2048.jpg)
![GET /carts/:id
items [
{
product
quantity
total
}
{
}
]
subTotal](https://image.slidesharecdn.com/sangria-graphqlapisinscala-180421083647/75/GraphQL-APIs-in-Scala-with-Sangria-11-2048.jpg)
![type User {
name: String
friends: [User]
city: City
}
type City {
name: String
population: Int
citizens: [User]
}
1. Define schema
{
user(name: String): User
...
}](https://image.slidesharecdn.com/sangria-graphqlapisinscala-180421083647/75/GraphQL-APIs-in-Scala-with-Sangria-25-2048.jpg)
![3. Get it!
{
user(name: “Vova Unicorn”) {
friends {
name
}
city {
name
population
}
}
}
{
“data”: {
“user”: {
“friends”: [
{ “name”: “Lena” },
{ “name”: “Stas” }
]
“city”: {
“name”: “Kyiv”,
“population”: 2928087
}
}
}
}](https://image.slidesharecdn.com/sangria-graphqlapisinscala-180421083647/75/GraphQL-APIs-in-Scala-with-Sangria-28-2048.jpg)
![only necessary data
{
“data”: {
“user”: {
“friends”: [
{ “name”: “Lena” },
{ “name”: “Stas” }
]
“city”: {
“name”: “Kyiv”,
“population”: 2928087
}
}
}
}
{
user(name: “Vova Unicorn”) {
friends {
name
}
city {
name
population
}
}
}](https://image.slidesharecdn.com/sangria-graphqlapisinscala-180421083647/75/GraphQL-APIs-in-Scala-with-Sangria-29-2048.jpg)
![in one request *
{
“data”: {
“user”: {
“friends”: [
{ “name”: “Lena” },
{ “name”: “Stas” }
]
“city”: {
“name”: “Kyiv”,
“population”: 2928087
}
}
}
}
{
user(name: “Vova Unicorn”) {
friends {
name
}
city {
name
population
}
}
}
HTTP POST](https://image.slidesharecdn.com/sangria-graphqlapisinscala-180421083647/75/GraphQL-APIs-in-Scala-with-Sangria-30-2048.jpg)
![subscription {
productAdded(cart: 123) {
items {
product ...
}
subTotal
}
}
{
“data”: {
“productAdded”: {
“items”: [
{ “product”: ... },
{ “product”: ... },
{ “product”: ... },
{ “product”: ... }
]
“subTotal”: 289.33
}
}
}
://](https://image.slidesharecdn.com/sangria-graphqlapisinscala-180421083647/75/GraphQL-APIs-in-Scala-with-Sangria-68-2048.jpg)
![{
“data”: {
“productAdded”: {
“items”: [
{ “product”: ... },
{ “product”: ... },
{ “product”: ... },
{ “product”: ... }
]
“subTotal”: 289.33
}
}
}
subscription {
productAdded(cart: 123) {
items {
product ...
}
subTotal
}
}
://](https://image.slidesharecdn.com/sangria-graphqlapisinscala-180421083647/75/GraphQL-APIs-in-Scala-with-Sangria-69-2048.jpg)
Uploaded byVladimir Tsukur
GraphQL APIs in Scala with Sangria
The document discusses APIs in Scala, focusing on the GraphQL query language and its efficient data fetching capabilities. It highlights the importance of defining schemas, making queries, and optimally managing data requests to reduce over-fetching and under-fetching issues. Additionally, it addresses challenges like security, error handling, and managing outdated APIs, while outlining specific examples and suggestions for improvement.
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GraphQL APIs in Scala with Sangria
- 1. APIs in Scalawith Volodymyr Tsukur
- 2.
- 3. Volodymyr Tsukur R&D Manager, LeadEngineer @ Partner @ EASYHUNT Program Committee @ JEEConf, XP Days flushdia vtsukur
- 4. Lithuania Ukraine Kyiv Dnipro Vilnius Wix Engineering Locations Israel TelAviv Be’er Sheva 120M+ users* 700+ engineers 2100+ employees 600+ microservices
- 7.
- 8.
- 9.
- 10.
- 11.
- 12. GET /carts/1 GET /products/59eb838e3f GET/products/59eb88c400 GET /products/59eb838e40
- 13. - UNDER-fetching - extrarequests 02
- 14.
- 15. GET /carts/1?projection=summary GET /carts/1?projection= GET/carts/1?projection= GET /carts/1?projection=with-products
- 16. - no unified& widely adopted standard :( * - harder to collaborate :( 03
- 18. How to @deprecateand phase out outdated stuff? 04
- 20.
- 23.
- 24. “... is aquery language for APIs and a runtime for fulfilling those queries with your existing data”
- 25. type User { name:String friends: [User] city: City } type City { name: String population: Int citizens: [User] } 1. Define schema { user(name: String): User ... }
- 26. 2. Ask fordata user(name: String): User
- 27. 2. Ask fordata { user(name: “Vova Unicorn”) { friends { name } city { name population } } }
- 28. 3. Get it! { user(name:“Vova Unicorn”) { friends { name } city { name population } } } { “data”: { “user”: { “friends”: [ { “name”: “Lena” }, { “name”: “Stas” } ] “city”: { “name”: “Kyiv”, “population”: 2928087 } } } }
- 29. only necessary data { “data”:{ “user”: { “friends”: [ { “name”: “Lena” }, { “name”: “Stas” } ] “city”: { “name”: “Kyiv”, “population”: 2928087 } } } } { user(name: “Vova Unicorn”) { friends { name } city { name population } } }
- 30. in one request* { “data”: { “user”: { “friends”: [ { “name”: “Lena” }, { “name”: “Stas” } ] “city”: { “name”: “Kyiv”, “population”: 2928087 } } } } { user(name: “Vova Unicorn”) { friends { name } city { name population } } } HTTP POST
- 31. let us seehow it works!
- 32. WYSIWYG efficient fetching easier todevelop analytics any data source and transport
- 35.
- 36. let us rockand roll!
- 37.
- 38. { cart(id: 1) { items{ product { title price images(limit: 1) sku } quantity total } subTotal } } 1)
- 39. { cart(id: 1) { items{ product { title price images(limit: 1) sku } quantity total } subTotal } } 2) 1 service call
- 40. { cart(id: 1) { items{ product { title price images(limit: 1) sku } quantity total } subTotal } } 3) + n x product { title price images(limit: 1) sku } product { title price images(limit: 1) sku } GET /products/1 GET /products/2 GET /products/3
- 42. e x pe c t a t i o n s
- 43.
- 44. { cart(id: 1) { items{ product { title price images(limit: 1) sku } quantity total } subTotal } } + GET /products?ids=1,2,3
- 45.
- 46.
- 47. { user(name: “Vova Unicorn”){ friends { name friends { name friends { name friends { name ... } } } } } }
- 50. limit query depth limitquery complexity
- 51.
- 52. throttling / ratelimiting set timeouts pagination
- 53.
- 54. schema { query: Query, mutation:Mutation }
- 55. type Mutation { addProductToCart(cart:ID!, product: ID!, count: Int = 1): Cart }
- 56.
- 57.
- 59. I want it!!!
- 60. but let ussee the BAD parts
- 61. caching security error handling arbitrary resources/ file uploads
- 62.
- 64.
- 65.
- 66. but it shines asan integrated solution
- 67. schema { query: Query, mutation:Mutation, subscription: Subscription }
- 68. subscription { productAdded(cart: 123){ items { product ... } subTotal } } { “data”: { “productAdded”: { “items”: [ { “product”: ... }, { “product”: ... }, { “product”: ... }, { “product”: ... } ] “subTotal”: 289.33 } } } ://
- 69. { “data”: { “productAdded”: { “items”:[ { “product”: ... }, { “product”: ... }, { “product”: ... }, { “product”: ... } ] “subTotal”: 289.33 } } } subscription { productAdded(cart: 123) { items { product ... } subTotal } } ://
- 72.
- 74.