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A small library for using unfiltered as a finagle frontend.

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unfinagled
==========

Unfinagled is an experimental module for using [unfiltered](https://github.com/unfiltered/unfiltered) as a
[finagle](https://github.com/twitter/finagle) frontend.

Finagle is oriented around the idea of [services](http://twitter.github.io/finagle/guide/ServicesAndFilters.html#services)
which, as it turns out, are not unlike unfiltered [intents](http://unfiltered.databinder.net/Plans+and+Intents.html). If we
treat Finagle as another server runtime, the strategy becomes the transformation of an unfiltered intent into a Finagle
service.

### Modules

Unfinagled is composed a few modules named similarly to those found in Unfiltered.

#### unfinagled-core

Unfiltered focuses on the processing of HTTP requests and abstracting away their representation; this module is the same.
If you have written portable intents, ie, no extractors reach into the request's ``underlying`` member or explicitly
require a specific representation, then running these within Finagle will be a matter of changing the referenced intent
type, at most. This module does use unfiltered's provided ``unfiltered-netty`` module for its internal representation
and processing, so if you currently use this, nothing changes.

Consider this intent:

```scala
object FooIntent {
  def intent: unfiltered.netty.cycle.Plan.Intent = {
    case GET(Path("/")) => ResponseString("Hi")
    case GET(Path("/foobar")) => ResponseString("GOT foobar!")
  }
}
```

Unfinagled provides a function to transform such an intent into a Finagle service: ``UnfilteredService``. It looks like
this:

```scala
val ufService = UnfilteredService(FooIntent.intent)
```

With this in hand, we can now create a Finagle server using unfiltered intents as the request processors:

```scala
val server: Server =
  ServerBuilder()
    .bindTo(address)
    .name("UnfilteredHttpServer")
    .codec(UnfilteredCodec())
    .build(ufService)
```

##### Futures support

Intents that return Finagle or Scala Futures are also supported:

```scala
import com.twitter.util.Future
object TFIntent {
  def intent: com.novus.unfinagled.TwitterFuturePlan.Intent = {
    case GET(Path("/")) => Future { ResponseString("Hello from the future") }
  }
}

import scala.concurrent._
object SCIntent {
  implicit val executionContext = ExecutionContext.Implicits.global

def intent: com.novus.unfinagled.FuturePlan.Intent = {
    case GET(Path("/")) => Future { ResponseString("Hello from the future") }
  }
}
```

#### unfinagled-server

The server module provides conveniences for building and running intents as Finagle services. If you prefer to use
Finagle's ``ServerBuilder`` directly, you have no need of this module. What you get from this module is a slightly more
streamlined construction process, a familiar Unfiltered feel, and an implementation of Unfiltered's ``RunnableServer``.
This is great for development within sbt as you can easily start and stop your server without killing the sbt session.
Usage looks like this:

```scala
Http("myservice", 8080)
  .service(UnfilteredService(intent))
  .start()
```

#### unfinagled-scalatest

This is a module facilitating integration or black-box testing within ScalaTest. It implements Unfiltered's ``Hosted``
trait so you can write tests for Unfinagled just like you would with Unfiltered on jetty or netty. An example:

```scala
class IntentSpec extends Served with GivenWhenThen with ShouldMatchers {

def intent = {
    case GET(Path("/foobar")) => ResponseString("baz")
  }

feature("Unfiltered front end") {
    scenario("GET foobar") {
      http(host / "foobar" as_str) should be("baz")
    }
  }
}
```

You provide the intent and you're given a server for each test.

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