├── .gitignore
├── .travis.yml
├── LICENSE
├── README.md
├── core
└── src
│ └── main
│ └── scala
│ └── jp
│ └── t2v
│ └── lab
│ └── play2
│ └── stackc
│ └── StackableController.scala
├── project
├── Build.scala
├── build.properties
└── plugins.sbt
└── sample
├── app
├── controllers
│ ├── Application.scala
│ └── stack
│ │ ├── DBSessionElement.scala
│ │ └── LoggingElement.scala
├── models
│ ├── Account.scala
│ ├── Message.scala
│ ├── Permission.scala
│ └── package.scala
└── views
│ ├── index.scala.html
│ ├── main.scala.html
│ └── messages.scala.html
├── conf
├── application.conf
└── routes
├── public
├── images
│ └── favicon.png
├── javascripts
│ └── jquery-1.9.0.min.js
└── stylesheets
│ └── main.css
└── test
├── ApplicationSpec.scala
└── IntegrationSpec.scala
/.gitignore:
--------------------------------------------------------------------------------
1 | logs
2 | project/project
3 | project/target
4 | target
5 | tmp
6 | .history
7 | dist
8 | /.idea
9 | /*.iml
10 | /out
11 | /.idea_modules
12 | /.classpath
13 | /.project
14 | /RUNNING_PID
15 | /.settings
16 |
--------------------------------------------------------------------------------
/.travis.yml:
--------------------------------------------------------------------------------
1 | language: scala
2 |
3 | jdk:
4 | - oraclejdk8
5 |
6 | sudo: false
7 |
8 | scala:
9 | - 2.11.7
10 |
11 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
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/README.md:
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1 | ## Play2 Stackable Action Composition
2 | [](https://gitter.im/t2v/stackable-controller?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
3 |
4 | This module offers Action Composition Utilities to Play2.1, 2.2, 2.3, 2.4, 2.5 applications
5 |
6 |
7 | ## Target
8 |
9 |
10 | This module targets the Scala version of Play2.x
11 |
12 | This module has been tested on Play2.5.0
13 |
14 |
15 | ## Motivation
16 |
17 | [Action Composition](http://www.playframework.com/documentation/2.4.2/ScalaActionsComposition) is somewhat limited in terms of composability.
18 |
19 | For example, imagine that we want automatic DB transaction management, auth, and pjax functionality.
20 |
21 |
22 | ```scala
23 | def TxAction(f: DBSession => Request[AnyContent] => Future[Result]): Action[AnyContent] = {
24 | Action.async { request =>
25 | import TxBoundary.Future._
26 | DB localTx { session =>
27 | f(session)(request)
28 | }
29 | }
30 | }
31 |
32 | def AuthAction(authority: Authority)(f: User => DBSession => Request[AnyContent] => Future[Result]): Action[AnyContent] = {
33 | TxAction { session => request =>
34 | val user: Either[Result, User] = authorized(authority)(request)
35 | user.right.map(u => f(u)(session)(request)).merge
36 | }
37 | }
38 |
39 | type Template = Html => Html
40 | def PjaxAction(authority: Authority)(f: Template => User => DBSession => Request[AnyContent] => Future[Result]): Action[AnyContent] = {
41 | AuthAction(authority) { user => session => request =>
42 | val template = if (req.headers.keys("X-Pjax")) views.html.pjaxTemplate.apply else views.html.fullTemplate.apply
43 | f(template)(user)(session)(request)
44 | }
45 | }
46 | ```
47 |
48 | ```scala
49 | def index = PjaxAction(NormalUser) { template => user => session => request =>
50 | val messages = Message.findAll(session)
51 | Ok(views.hrml.index(messages)(template))
52 | }
53 | ```
54 |
55 | So far so good, but what if we need a new action that does both DB transaction management and pjax?
56 |
57 | We have to create another PjaxAction.
58 |
59 | ```scala
60 | def PjaxAction(f: Template => DBSession => Request[AnyContent] => Future[Result]): Action[AnyContent] = {
61 | TxAction { session => request =>
62 | val template = if (req.headers.keys("X-Pjax")) html.pjaxTemplate.apply else views.html.fullTemplate.apply
63 | f(template)(session)(request)
64 | }
65 | }
66 | ```
67 |
68 | What a mess!
69 |
70 |
71 | As an alternative, this module offers Composable Action composition using the power of traits.
72 |
73 | ## Example
74 |
75 | 1. First step, Create a sub trait of `StackableController` for every function.
76 |
77 | ```scala
78 | trait AuthElement extends StackableController with AuthConfigImpl {
79 | self: Controller with Auth =>
80 |
81 | case object AuthKey extends RequestAttributeKey[User]
82 | case object AuthorityKey extends RequestAttributeKey[Authority]
83 |
84 | override def proceed[A](req: RequestWithAttributes[A])(f: RequestWithAttributes[A] => Future[Result]): Future[Result] = {
85 | (for {
86 | authority <- req.get(AuthorityKey).toRight(authorizationFailed(req)).right
87 | user <- authorized(authority)(req).right
88 | } yield super.proceed(req.set(AuthKey, user))(f)).merge
89 | }
90 |
91 | implicit def loggedIn(implicit req: RequestWithAttributes[_]): User = req.get(AuthKey).get
92 |
93 | }
94 | ```
95 |
96 | ```scala
97 | trait DBSessionElement extends StackableController {
98 | self: Controller =>
99 |
100 | case object DBSessionKey extends RequestAttributeKey[DBSession]
101 |
102 | override def proceed[A](req: RequestWithAttributes[A])(f: RequestWithAttributes[A] => Future[Result]): Future[Result] = {
103 | import TxBoundary.Future._
104 | DB.localTx { session =>
105 | super.proceed(req.set(DBSessionKey, session))(f)
106 | }
107 | }
108 |
109 | implicit def dbSession(implicit req: RequestWithAttributes[_]): DBSession = req.get(DBSessionKey).get
110 |
111 | }
112 | ```
113 |
114 | ```scala
115 | trait PjaxElement extends StackableController with AuthConfigImpl {
116 | self: Controller with Auth =>
117 |
118 | type Template = Html => Html
119 |
120 | case object TemplateKey extends RequestAttributeKey[Template]
121 |
122 | override def proceed[A](req: RequestWithAttributes[A])(f: RequestWithAttributes[A] => Future[Result]): Future[Result] = {
123 | val template = if (req.headers.keys("X-Pjax")) views.html.pjaxTemplate else views.html.fullTemplate
124 | super.proceed(req.set(TemplateKey, template))(f)
125 | }
126 |
127 | implicit def template(implicit req: RequestWithAttributes[_]): Template = req.get(TemplateKey).get
128 |
129 | }
130 | ```
131 |
132 | 2. mix your traits into your Controller
133 |
134 | ```scala
135 | object Application extends Controller with PjaxElement with AuthElement with DBSessionElement with Auth with AuthConfigImpl {
136 |
137 | def messages = StackAction(AuthorityKey -> NormalUser) { implicit req =>
138 | val messages = Message.findAll
139 | Ok(html.messages(messages)(loggedIn)(template))
140 | }
141 |
142 | def editMessage(id: MessageId) = StackAction(AuthorityKey -> Administrator) { implicit req =>
143 | val messages = Message.findAll
144 | Ok(html.messages(messages)(loggedIn)(template))
145 | }
146 |
147 | }
148 | ```
149 |
150 | 3. Mixin different combinations of traits, depending on the functionality that you need.
151 |
152 | ```scala
153 | object NoAuthController extends Controller with PjaxElement with DBSessionElement {
154 |
155 | def messages = StackAction { implicit req =>
156 | val messages = Message.findAll
157 | Ok(html.messages(messages)(GuestUser)(template))
158 | }
159 |
160 | def editMessage(id: MessageId) = StackAction { implicit req =>
161 | val messages = Message.findAll
162 | Ok(html.messages(messages)(GuestUser)(template))
163 | }
164 |
165 | }
166 | ```
167 |
168 | ## How to use
169 |
170 | Add a dependency declaration into your Build.scala or build.sbt file:
171 |
172 | ```scala
173 | libraryDependencies += "jp.t2v" %% "stackable-controller" % "0.6.0"
174 | ```
175 |
176 | - for Play2.2.x, use 0.3.0
177 | - for Play2.3.x, use 0.4.1
178 | - for Play2.4.x, use 0.5.1
179 |
180 | ## ExecutionContext
181 |
182 | When you want to use `scala.concurrent.ExecutionContext`, you can use `StackActionExecutionContext` method.
183 |
184 | `StackActionExecutionContext` returns an `ExecutionContext` that is given when `StackAction` method calling.
185 | So, users of your StackElement can customize `ExecutionContext`.
186 |
187 | ```scala
188 | trait AsyncElement extends StackableController with AuthConfigImpl {
189 | self: Controller with Auth =>
190 |
191 | private case object FooKey extends RequestAttributeKey[Foo]
192 |
193 | override def proceed[A](req: RequestWithAttributes[A])(f: RequestWithAttributes[A] => Future[Result]): Future[Result] = {
194 | val ctx: ExecutionContext = StackActionExecutionContext(req)
195 | val future: Future[Foo] = getFooAsynchronously(ctx)
196 | future flatMap {
197 | foo => super.proceed(req.set(FooKey, foo))(f)
198 | } recoverWith {
199 | _ => super.proceed(req)(f)
200 | }
201 | }
202 |
203 | implicit def foo(implicit req: RequestWithAttributes[_]): Foo = req.get(FooKey).get
204 |
205 | }
206 | ```
207 |
208 |
209 | ## License
210 |
211 | This library is released under the Apache Software License, version 2, which should be included with the source in a file named `LICENSE`.
212 |
--------------------------------------------------------------------------------
/core/src/main/scala/jp/t2v/lab/play2/stackc/StackableController.scala:
--------------------------------------------------------------------------------
1 | package jp.t2v.lab.play2.stackc
2 |
3 | import play.api.mvc._
4 | import scala.collection.concurrent.TrieMap
5 | import scala.concurrent.{Future, ExecutionContext}
6 | import scala.util.{Failure, Success}
7 | import scala.util.control.{NonFatal, ControlThrowable}
8 |
9 | trait StackableController {
10 | self: Controller =>
11 |
12 | final class StackActionBuilder(params: Attribute[_]*) extends ActionBuilder[RequestWithAttributes] {
13 | def invokeBlock[A](req: Request[A], block: (RequestWithAttributes[A]) => Future[Result]): Future[Result] = {
14 | val request = new RequestWithAttributes(req, new TrieMap[RequestAttributeKey[_], Any] ++= params.map(_.toTuple))
15 | try {
16 | cleanup(request, proceed(request)(block))(StackActionExecutionContext(request))
17 | } catch {
18 | case e: ControlThrowable => cleanupOnSucceeded(request, None); throw e
19 | case NonFatal(e) => cleanupOnFailed(request, e); throw e
20 | }
21 | }
22 | }
23 |
24 | final def AsyncStack[A](p: BodyParser[A], params: Attribute[_]*)(f: RequestWithAttributes[A] => Future[Result]): Action[A] = new StackActionBuilder(params: _*).async(p)(f)
25 | final def AsyncStack(params: Attribute[_]*)(f: RequestWithAttributes[AnyContent] => Future[Result]): Action[AnyContent] = new StackActionBuilder(params: _*).async(f)
26 | final def AsyncStack(f: RequestWithAttributes[AnyContent] => Future[Result]): Action[AnyContent] = new StackActionBuilder().async(f)
27 |
28 | final def StackAction[A](p: BodyParser[A], params: Attribute[_]*)(f: RequestWithAttributes[A] => Result): Action[A] = new StackActionBuilder(params: _*).apply(p)(f)
29 | final def StackAction(params: Attribute[_]*)(f: RequestWithAttributes[AnyContent] => Result): Action[AnyContent] = new StackActionBuilder(params: _*).apply(f)
30 | final def StackAction(f: RequestWithAttributes[AnyContent] => Result): Action[AnyContent] = new StackActionBuilder().apply(f)
31 |
32 | def proceed[A](request: RequestWithAttributes[A])(f: RequestWithAttributes[A] => Future[Result]): Future[Result] = f(request)
33 |
34 | def cleanupOnSucceeded[A](request: RequestWithAttributes[A], result: Option[Result]): Unit = cleanupOnSucceeded(request)
35 |
36 | def cleanupOnSucceeded[A](request: RequestWithAttributes[A]): Unit = ()
37 |
38 | def cleanupOnFailed[A](request: RequestWithAttributes[A], e: Throwable): Unit = ()
39 |
40 | private def cleanup[A](request: RequestWithAttributes[A], result: Future[Result])(implicit ctx: ExecutionContext): Future[Result] = result andThen {
41 | case Success(p) => cleanupOnSucceeded(request, Some(p))
42 | case Failure(e) => cleanupOnFailed(request, e)
43 | }
44 |
45 | protected object ExecutionContextKey extends RequestAttributeKey[ExecutionContext]
46 |
47 | protected def StackActionExecutionContext(implicit req: RequestWithAttributes[_]): ExecutionContext =
48 | req.get(ExecutionContextKey).getOrElse(play.api.libs.concurrent.Execution.defaultContext)
49 |
50 | }
51 |
52 |
53 | trait RequestAttributeKey[A] {
54 |
55 | def ->(value: A): Attribute[A] = Attribute(this, value)
56 |
57 | def →(value: A): Attribute[A] = Attribute(this, value)
58 |
59 | }
60 |
61 | case class Attribute[A](key: RequestAttributeKey[A], value: A) {
62 |
63 | def toTuple: (RequestAttributeKey[A], A) = (key, value)
64 |
65 | }
66 |
67 | class RequestWithAttributes[A](underlying: Request[A], attributes: TrieMap[RequestAttributeKey[_], Any]) extends WrappedRequest[A](underlying) {
68 |
69 | def get[B](key: RequestAttributeKey[B]): Option[B] = attributes.get(key).asInstanceOf[Option[B]]
70 |
71 | /** side effect! */
72 | def set[B](key: RequestAttributeKey[B], value: B): RequestWithAttributes[A] = {
73 | attributes.put(key, value)
74 | this
75 | }
76 |
77 | }
78 |
79 |
--------------------------------------------------------------------------------
/project/Build.scala:
--------------------------------------------------------------------------------
1 | import sbt._
2 | import Keys._
3 | import play.sbt.routes.RoutesKeys.routesGenerator
4 | import play.routes.compiler.StaticRoutesGenerator
5 |
6 | object StackableControllerProjects extends Build {
7 |
8 | lazy val _organization = "jp.t2v"
9 |
10 | lazy val _version = "0.6.0-SNAPSHOT"
11 |
12 | def _publishTo(v: String) = {
13 | val nexus = "https://oss.sonatype.org/"
14 | if (v.trim.endsWith("SNAPSHOT")) Some("snapshots" at nexus + "content/repositories/snapshots")
15 | else Some("releases" at nexus + "service/local/staging/deploy/maven2")
16 | }
17 |
18 | lazy val _resolvers = Seq(
19 | "scalaz-bintray" at "https://dl.bintray.com/scalaz/releases",
20 | "sonatype releases" at "http://oss.sonatype.org/content/repositories/releases"
21 | )
22 |
23 | lazy val _scalacOptions = Seq("-unchecked")
24 |
25 | lazy val _pomExtra = {
26 |
t |