Scala Matsuri 2017

http://2017.scalamatsuri.org/

Transcript

1. Let's Build a Serverless Architecture in Scala! Yoshitaka Fujii (@yoshiyoshifujii)
 2017 ScalaMatsuri
 Saturday, February 25th
 16:30 - 17:10 Conference Room 1
2. Who am I ? • Yoshitaka Fujii (@yoshiyoshifujii) • Joined MOTEX in April, 2014 • Software Engineer • Scala(19 months) • Scala Kansai summit 2016 staff. ࣗݾ঺հɻΤϜΦʔςοΫεגࣜձࣾɻ4DBMBྺϲ݄ɻ4DBMBؔ੢αϛοτͰελοϑ͍͖ͤͯͨͩ͞·ͨ͠ɻ
4. Agenda • Serverless Architecture • Development & Deployment • DDD
5. Serverless Architecture • using FaaS • a significant reduction in costs • scalability • the lack of operating and maintaining infrastructure αʔόϨεΞʔΩςΫνϟͱ͸ɺ'BB4Λ׆༻ͨ͠γεςϜɻίετͷେ෯ͳ࡟ݮɻεέʔϥϏϦςΟɻ
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6. Function as a Service • AWS Lambda • Google Cloud Function • Microsoft Azure Functions
7. AWS Lambda • AWS Lambda is a compute service that lets you run code without provisioning or managing servers. • executes your code only when needed. • scales automatically, a few requests per day to thousands per second. • Node.js, Java, C# and Python "84
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8. AWS Lambda Events • API Gateway (HTTP Requests) • Kinesis Streams • DynamoDB • S3 • Schedule (CloudWatch) • SNS • IoT ͜ΕΒͷ"84αʔϏεͷΠϕϯτʹԠͯ͡"84
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9. Amazon API Gateway • Amazon API Gateway is a fully managed service that makes it easy for developers to create, publish, maintain, monitor, and secure APIs at any scale. • Low-Cost and Efficient.
 (only for calls made to your APIs and data transfer out) • Performance at Any Scale • Run Your APIs Without Servers ϑϧϚωʔδυαʔϏεͰɺ։ൃऀ͸ͲͷΑ͏ͳεέʔϧͰ͋ͬͯ΋ɺ؆୯ʹ
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11. Amazon Kinesis Streams • Use Amazon Kinesis Streams to collect and process large streams of data records in real time. • rapid and continuous data intake and aggregation. • Accelerated log and data feed intake and processing. • Real-time metrics and reporting. • Real-time data analytics. • Complex stream processing. "NB[PO
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13. Amazon API Gateway client AWS Lambda Amazon S3 Amazon DynamoDB Amazon Kinesis AWS Lambda AWS Lambda Amazon Elasticsearch Service Context + Token Principal + Policy Policy is cached Denied 403 Allowed Auth function Consumers function System diagrams
14. Amazon API Gateway client AWS Lambda Amazon S3 Amazon DynamoDB Amazon Kinesis AWS Lambda Amazon Elasticsearch Service Policy is cached Large scale system client client client client client AWS Lambda AWS Lambda AWS Lambda AWS Lambda AWS Lambda AWS Lambda AWS Lambda AWS Lambda AWS Lambda AWS Lambda AWS Lambda େن໛ͳγεςϜΛ૝ఆ͍ͯ͠·͢ɻ
15. Large scale system • More functional requirements. • AWS Lambda wants to be a simple function. • 1 Lambda per method request.
 GET:/hello => getHello
 POST:/hello => postHello • develop and deploy efficiently େن໛ͳγεςϜ͸ɺػೳཁ͕݅ଟ͍ɻ"84
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16. Development & Deployment ࣮ࡍʹ։ൃͯ͠σϓϩΠ͢Δ͋ͨΓΛ঺հ͠·͢ɻ
17. How to make simple AWS Lambda. ୯७ͳ"84
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18. RequestStreamHandler.java public interface RequestStreamHandler { /** * Handles a Lambda Function request * @param input The Lambda Function input stream * @param output The Lambda function output stream * @param context The Lambda execution environment context object. * @throws IOException */ public void handleRequest(InputStream input, OutputStream output, Context context) throws IOException; } "84
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19. RequestHandler.java public interface RequestHandler<I, O> { /** * Handles a Lambda Function request * @param input The Lambda Function input * @param context The Lambda execution environment context object. * @return The Lambda Function output */ public O handleRequest(I input, Context context); } *0Λ೚ҙͷܕͰ࣮૷Ͱ͖·͕͢ɺ+BWB
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20. build.sbt lazy val root = (project in file(".")). settings( name := "aws-lambda-scala", organization := "com.example", scalaVersion := "2.12.1", libraryDependencies ++= Seq( "com.amazonaws" % "aws-lambda-java-core" % "1.1.0" ) )
21. project/plugins.sbt addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.3")
22. src/main/scala/com/example/Hello.scala class HelloHandler extends RequestStreamHandler { @throws(classOf[java.io.IOException]) override def handleRequest(input: InputStream, output: OutputStream, context: Context): Unit = { val bytes = toByteArray(input) output.write(bytes) } def toByteArray(input: InputStream) = Stream.continually(input.read).takeWhile(_ != -1).map(_.toByte).toArray }
23. assembly $ sbt > assembly [info] Packaging .../target/scala-2.12/aws-lambda-scala-assembly-0.1.0-SNAPSHOT.jar
24. AWS CLI - lambda create function $ aws lambda create-function \ --region us-east-1 \ --function-name aws-lambda-scala \ --zip-file fileb://aws-lambda-scala-assembly-0.1.0-SNAPSHOT.jar \ --role arn:aws:iam::${AWS Account ID}:role/lambda_basic_execution \ --handler com.example.HelloHandler::handleRequest \ --runtime java8 \ --timeout 15 \ --memory-size 512
25. AWS CLI - lambda create function { "LastModified": "2017-01-02T12:34:56.789+0000", "FunctionName": "aws-lambda-scala", "Runtime": "java8", "Version": "$LATEST", "Role": "arn:aws:iam::${AWS Account ID}:role/lambda_basic_execution", "CodeSha256": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", "Handler": "com.example.HelloHandler::handleRequest", "Timeout": 15, "Description": "", "MemorySize": 512, "FunctionArn": "arn:aws:lambda:us-east-1:${AWS Account ID}:function:aws-lambda-scala", "CodeSize": 5264477 }
26. AWS CLI - lambda invoke $ aws lambda invoke \ --region us-east-1 \ --function-name aws-lambda-scala \ --payload 123 \ --invocation-type RequestResponse /tmp/response { "StatusCode": 200 } 123
27. Amazon API Gateway client AWS Lambda Amazon S3 Amazon DynamoDB Amazon Kinesis AWS Lambda AWS Lambda Amazon Elasticsearch Service Context + Token Principal + Policy Policy is cached Denied 403 Allowed Auth function Consumers function System diagrams
28. Labor … • It is hard to run Lambda. • I will `assembly` one by one and upload it. • It is troublesome to configure the API Gateway on the console. -BNCEBͰ࣮ߦ͢Δ·Ͱ͕େมɻBTTFNCMZͯ͠Ξοϓϩʔυͯ͠Λ܁Γฦ͞ͳ͍ͱ͏·͘ಈ͔͘෼͔Βͳ͍ɻίϯιʔϧ্Ͱ"1*
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29. sbt-aws-serverless plugin • sbt plugin to deploy code to Amazon API Gateway and AWS Lambda. • https://github.com/yoshiyoshifujii/sbt-aws-serverless ࣗલͰ։ൃͨ͠TCUQMVHJOΛ࢖͍·͢ɻ"1*
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30. serverless framework • To be honest this way is better. • However, blue green deployment is difficult. ਖ਼௚ɺTFSWFSMFTT
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32. Amazon API Gateway 4UBHF 4UBHF
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33. Amazon API Gateway 4UBHF 4UBHF
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34. Amazon API Gateway 4UBHF 4UBHF
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35. in this case • Release the test environment as it is. • Quickly return to the previous version. • A/B Testing. • Canary Release.
 https://martinfowler.com/bliki/CanaryRelease.html ͜ͷํࣜͳΒɺςετͨ͠؀ڥΛͦͷ··ϦϦʔεͰ͖Δɻ͙͢ʹલͷόʔδϣϯʹ໭͢͜ͱ͕Ͱ͖Δɻ"#ςετ΍ɺΧφϦΞɾϦ Ϧʔεʹ࢖͑Δɻ
36. Giter8 • https://github.com/yoshiyoshifujii/sbt-aws-serverless-ddd.g8 $ sbt new yoshiyoshifujii/sbt-aws-serverless-ddd.g8 name [My Something Project]: version [0.1.0-SNAPSHOT]: organization [com.example]: package [com.example]: (JUFSͰαϯϓϧϓϩδΣΫτΛެ։͠·ͨ͠ɻ
37. Domain Driven Design
38. DDD - Hexagonal architecture • Implementing Domain-Driven Design - 2013/2/16 • Vaughn Vernon • Mitigate vendor lock-in. %%%ͷϔΩαΰφϧΞʔΩςΫνϟΛ࠾༻͢ΔɻϕϯμʔϩοΫΠϯΛ؇࿨Ͱ͖Δɻ
39. Dependency model "QQMJDBUJPO *OGSBTUSVDUVSF %PNBJO "1* ґଘϞσϧɻ
40. Dependency model "QQMJDBUJPO *OGSBTUSVDUVSF %PNBJO "1* "1*ͱ"QQMJDBUJPO૚͸ɺϕϯμʔϩοΫΠϯɻυϝΠϯ͸ɺ࠶ར༻ՄೳɻΠϯϑϥ͸Ұ෦࠶ར༻Մೳɻ vendor lock-in
41. Amazon API Gateway client AWS Lambda Amazon S3 Amazon DynamoDB Amazon Kinesis AWS Lambda AWS Lambda Amazon Elasticsearch Service Context + Token Principal + Policy Policy is cached Denied 403 Allowed Auth function Consumers function System diagrams Make this part
42. build.sbt - dependsOn lazy val domain = (project in file("./modules/domain")). lazy val infraDynamo = (project in file("./modules/infrastructure/dynamodb")). dependsOn(domain). lazy val infraKinesis = (project in file("./modules/infrastructure/kinesis")). dependsOn(domain). lazy val appHello = (project in file("./modules/application/hello")). dependsOn(infraLambda, infraDynamo, infraKinesis). ϚϧνϓϩδΣΫτͷґଘؔ܎ΛґଘϞσϧͷ௨Γʹઃఆɻ
43. Project tree • Sources under modules. • application is a module of Lambda. • Make the Infrastructure as finely as possible. • Reduce module size. ϓϩδΣΫτߏ੒ɻιʔε͸NPEVMFTσΟϨΫτϦͷ഑Լʹஔ͘ɻBQQMJDBUJPO͕-BNCEBͷϞδϡʔϧʹͳΔɻ*OGSBTUSVDUVSF͸ݶ Γͳ͘খ͘͞࡞Δɻ-BNCEBͷϞδϡʔϧαΠζΛখ͘͢͞ΔͨΊɻ
44. domain • POSO (Plain old Scala object) • Do not specify anything for libraryDependencies. EPNBJO૚ɻ1040Ͱ࡞ΔɻMJCSBSZ%FQFOEFODJFTʹԿ΋ࢦఆ͠ͳ͍ɻ
45. Account case class AccountId(value: String) extends ValueObject[String] case class Account( id: AccountId, version: Option[Version], email: String, password: String, name: String) extends Entity[AccountId]
46. AccountRepository trait AccountRepository { def save(account: Account): Either[DomainError, Account] def get(id: AccountId): Either[DomainError, Option[Account]] def findBy(email: String): Either[DomainError, Option[Account]] def findAll: Either[DomainError, Seq[Account]] }
47. AccountEventPublisher case class AccountModified( accountId: AccountId, email: String, password: String, name: String) trait AccountEventPublisher { def publish(modified: AccountModified): Either[DomainError, AccountModified] }
48. infrastructure • implementation of Repository or Domain Event. • DI with Cake pattern. • It has no direct inheritance relation. JOGSBTUSVDUVSF૚ɻ3FQPTJUPSZ΍%PNBJO&WFOUͷ࣮૷Λ࣋ͭɻ$BLF
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49. AccountRepositoryOnDynamoDB trait AccountRepositoryOnDynamoDB { def save(account: Account): Either[DomainError, Account] = ??? def get(id: AccountId): Either[DomainError, Option[Account]] = ??? def findBy(email: String): Either[DomainError, Option[Account]] = ??? def findAll: Either[DomainError, Seq[Account]] = ??? }
50. AccountEventPublisherOnKinesis trait AccountEventPublisherOnKinesis { def publish(modified: AccountModified): Either[DomainError, AccountModified] = ??? }
51. application • Generate Lambda's module. • Dependency injection. BQQMJDBUJPO૚ɻ-BNCEBͷϞδϡʔϧΛੜ੒͢Δɻґଘੑ͕஫ೖ͢Δɻ
52. Base trait Base extends BaseStreamHandler { val accountRepository: AccountRepository val accountEventPublisher: AccountEventPublisher override def handle(input: Input): Try[String] = Try { JsObject( "message" -> JsString("hello world!!") ).compactPrint } }
53. App class App extends Base { override val accountRepository = new AccountRepository with AccountRepositoryOnDynamoDB override val accountEventPublisher = new AccountEventPublisher with AccountEventPublisherOnKinesis }
54. Amazon API Gateway client AWS Lambda Amazon S3 Amazon DynamoDB Amazon Kinesis AWS Lambda AWS Lambda Amazon Elasticsearch Service Context + Token Principal + Policy Policy is cached Denied 403 Allowed Auth function Consumers function System diagrams Make this part
55. build.sbt - dependsOn lazy val domain = (project in file("./modules/domain")). lazy val infraDomain = (project in file("./modules/infrastructure/domain")). dependsOn(domain). lazy val appAccountModified = (project in file(“./modules/application/accountmodified”)). dependsOn(infraLambdaConsumer, infraDomain). ґଘؔ܎͸ɺ"1*
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56. Demo
57. sbt deploy prod $ sbt \ -DAWS_ACCOUNT_ID=<AWS Account ID> \ -DAWS_ROLE_ARN=arn:aws:iam::<AWS Account ID>:role/<Role NAME> \ -DAWS_BUCKET_NAME=<BUCKET NAME> > deploy v1 API Gateway created: xxxxxxxxxx API Gateway put: xxxxxxxxxx Lambda deployed: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-auth Lambda published: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-auth:1 Lambda Alias: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-auth:prod Authorizer: auauau Lambda deployed: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-app-hello Lambda published: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-app-hello:1 Lambda Alias: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-app-hello:prod_1 Create Deployment: {Id: dddddd,Description: 0.1.0-SNAPSHOT,CreatedDate: Sat Feb 25 12:34:56 JST 2017,}
58. Amazon API Gateway 4UBHF 4UBHF
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59. sbt deploy test $ sbt \ -DAWS_ACCOUNT_ID=<AWS Account ID> \ -DAWS_ROLE_ARN=arn:aws:iam::<AWS Account ID>:role/<Role NAME> \ -DAWS_BUCKET_NAME=<BUCKET NAME> > deploy test API Gateway created: xxxxxxxxxx API Gateway put: xxxxxxxxxx Lambda deployed: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-auth Lambda published: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-auth:2 Lambda Alias: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-auth:test Authorizer: auauau Lambda deployed: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-app-hello Lambda published: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-app-hello:2 Lambda Alias: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-app-hello:test_2 Create Deployment: {Id: dddddd,Description: 0.1.0-SNAPSHOT,CreatedDate: Sat Feb 25 12:34:56 JST 2017,}
60. Amazon API Gateway 4UBHF 4UBHF
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61. sbt deployCopy test to prod $ sbt \ -DAWS_ACCOUNT_ID=<AWS Account ID> \ -DAWS_ROLE_ARN=arn:aws:iam::<AWS Account ID>:role/<Role NAME> \ -DAWS_BUCKET_NAME=<BUCKET NAME> > deployCopy test prod Lambda Alias: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-auth:prod Lambda Alias: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-app-hello:prod_2 Stage: prod
62. Amazon API Gateway 4UBHF 4UBHF
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63. sbt deployDev $ sbt \ -DAWS_ACCOUNT_ID=<AWS Account ID> \ -DAWS_ROLE_ARN=arn:aws:iam::<AWS Account ID>:role/<Role NAME> \ -DAWS_BUCKET_NAME=<BUCKET NAME> > deployDev dev API Gateway created: xxxxxxxxxx API Gateway put: xxxxxxxxxx Lambda deployed: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-auth Lambda Alias: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-auth:dev Authorizer: auauau Lambda deployed: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-app-hello Lambda Alias: arn:aws:lambda:us-east-1:aaaaaaaaaaaa:function:$name-app-hello:dev Create Deployment: {Id: ddddd,Description: 0.1.0-SNAPSHOT,CreatedDate: Sat Feb 25 12:34:56 JST 2017,}
64. sbt deployList $ sbt \ -DAWS_ACCOUNT_ID=<AWS Account ID> \ -DAWS_ROLE_ARN=arn:aws:iam::<AWS Account ID>:role/<Role NAME> \ -DAWS_BUCKET_NAME=<BUCKET NAME> > deployList dev ============================================================================================================ xxxxxxxxxx ============================================================================================================ | Stage Name | Last Updated Date | Deployment Id | Description | |----------------------|--------------------------------|-----------------|--------------------------------| | dev | Mon Feb 20 21:30:07 JST 2017 | qirn6v | null | | v1 | Mon Feb 20 21:23:41 JST 2017 | 8tb1zr | null | ===================================================================================== xxxxxxxxxx ===================================================================================== | Created Date | Deployment Id | Description | |--------------------------------|-----------------|--------------------------------| | Mon Feb 20 21:30:07 JST 2017 | ddddd2 | 0.1.0-SNAPSHOT | | Mon Feb 20 21:23:41 JST 2017 | ddddd1 | 0.1.0-SNAPSHOT |
65. sbt invoke $ sbt \ -DAWS_ACCOUNT_ID=<AWS Account ID> \ -DAWS_ROLE_ARN=arn:aws:iam::<AWS Account ID>:role/<Role NAME> \ -DAWS_BUCKET_NAME=<BUCKET NAME> > invoke prod ============================================================ GET:https://xxxxxxxxxx.execute-api.us-east-1.amazonaws.com/prod/hellos ============================================================ 200 {"message":"hello world!!"}
66. Summary • Scala is easy to combine DDD and Serverless. • Easy to share processing with multiple projects. • Cheap, scalable and easy to operate. 4DBMB͸%%%ͱ4FSWFSMFTTΛ૊Έ߹ΘͤΔͱ΍Γ΍͍͢ɻϚϧνϓϩδΣΫτͰॲཧΛڞ௨Խ͠΍͍͢ɻ҆ͯ͘εέʔϥϒϧͰӡ༻ ָ͕ɻ