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package cask.main
import cask.endpoints.WebsocketResult
import cask.model._
import cask.internal.Router.EntryPoint
import cask.internal.{DispatchTrie, Router, Util}
import io.undertow.Undertow
import io.undertow.server.{HttpHandler, HttpServerExchange}
import io.undertow.server.handlers.BlockingHandler
import io.undertow.util.HttpString
/**
* A combination of [[cask.Main]] and [[cask.Routes]], ideal for small
* one-file web applications.
*/
class MainRoutes extends BaseMain with Routes{
def allRoutes = Seq(this)
}
/**
* Defines the main entrypoint and configuration of the Cask web application.
*
* You can pass in an arbitrary number of [[cask.Routes]] objects for it to
* serve, and override various properties on [[Main]] in order to configure
* application-wide properties.
*/
class Main(servers0: Routes*) extends BaseMain{
def allRoutes = servers0.toSeq
}
abstract class BaseMain{
def mainDecorators = Seq.empty[cask.main.Decorator]
def allRoutes: Seq[Routes]
def port: Int = 8080
def host: String = "localhost"
def debugMode: Boolean = true
lazy val routeList = for{
routes <- allRoutes
route <- routes.caskMetadata.value.map(x => x: Routes.EndpointMetadata[_])
} yield (routes, route)
lazy val routeTries = Seq("get", "put", "post", "websocket")
.map { method =>
method -> DispatchTrie.construct[(Routes, Routes.EndpointMetadata[_])](0,
for ((route, metadata) <- routeList if metadata.endpoint.methods.contains(method))
yield (Util.splitPath(metadata.endpoint.path): collection.IndexedSeq[String], (route, metadata), metadata.endpoint.subpath)
)
}.toMap
def writeResponse(exchange: HttpServerExchange, response: Response.Raw) = {
response.headers.foreach{case (k, v) =>
exchange.getResponseHeaders.put(new HttpString(k), v)
}
response.cookies.foreach(c => exchange.setResponseCookie(Cookie.toUndertow(c)))
exchange.setStatusCode(response.statusCode)
response.data.write(exchange.getOutputStream)
}
def handleNotFound(): Response.Raw = {
Response(
s"Error 404: ${Status.codesToStatus(404).reason}",
statusCode = 404
)
}
def defaultHandler = new BlockingHandler(
new HttpHandler() {
def handleRequest(exchange: HttpServerExchange): Unit = try {
// println("Handling Request: " + exchange.getRequestPath)
val (effectiveMethod, runner) = if (exchange.getRequestHeaders.getFirst("Upgrade") == "websocket") {
"websocket" -> ((r: Any) =>
r.asInstanceOf[WebsocketResult] match{
case l: WebsocketResult.Listener =>
io.undertow.Handlers.websocket(l.value).handleRequest(exchange)
case r: WebsocketResult.Response[_] =>
writeResponseHandler(r).handleRequest(exchange)
}
)
} else (
exchange.getRequestMethod.toString.toLowerCase(),
(r: Any) => writeResponse(exchange, r.asInstanceOf[Response.Raw])
)
routeTries(effectiveMethod).lookup(Util.splitPath(exchange.getRequestPath).toList, Map()) match {
case None => writeResponse(exchange, handleNotFound())
case Some(((routes, metadata), routeBindings, remaining)) =>
val ctx = Request(exchange, remaining)
def rec(remaining: List[Decorator],
bindings: List[Map[String, Any]]): Router.Result[Any] = try {
remaining match {
case head :: rest =>
head.wrapFunction(
ctx,
args => rec(rest, args :: bindings).asInstanceOf[Router.Result[head.InnerReturned]]
)
case Nil =>
metadata.endpoint.wrapFunction(ctx, endpointBindings =>
metadata.entryPoint
.asInstanceOf[EntryPoint[cask.main.Routes, cask.model.Request]]
.invoke(
routes, ctx,
(endpointBindings ++ routeBindings.mapValues(metadata.endpoint.wrapPathSegment))
:: bindings.reverse
)
.asInstanceOf[Router.Result[Nothing]]
)
}
// Make sure we wrap any exceptions that bubble up from decorator
// bodies, so outer decorators do not need to worry about their
// delegate throwing on them
}catch{case e: Throwable => Router.Result.Error.Exception(e) }
rec((metadata.decorators ++ routes.decorators ++ mainDecorators).toList, Nil)match{
case Router.Result.Success(res) => runner(res)
case e: Router.Result.Error =>
writeResponse(
exchange,
handleEndpointError(exchange, routes, metadata, e).map(Response.Data.StringData)
)
None
}
}
// println("Completed Request: " + exchange.getRequestPath)
}catch{case e: Throwable =>
e.printStackTrace()
}
}
)
def writeResponseHandler(r: WebsocketResult.Response[_]) = new BlockingHandler(
new HttpHandler {
def handleRequest(exchange: HttpServerExchange): Unit = {
writeResponse(exchange, r.value)
}
}
)
def handleEndpointError(exchange: HttpServerExchange,
routes: Routes,
metadata: Routes.EndpointMetadata[_],
e: Router.Result.Error) = {
val statusCode = e match {
case _: Router.Result.Error.Exception => 500
case _: Router.Result.Error.InvalidArguments => 400
case _: Router.Result.Error.MismatchedArguments => 400
}
val str =
if (!debugMode) s"Error $statusCode: ${Status.codesToStatus(statusCode).reason}"
else ErrorMsgs.formatInvokeError(
routes,
metadata.entryPoint.asInstanceOf[EntryPoint[cask.main.Routes, _]],
e
)
println(str)
Response(str, statusCode = statusCode)
}
def main(args: Array[String]): Unit = {
val server = Undertow.builder
.addHttpListener(port, host)
.setHandler(defaultHandler)
.build
server.start()
}
}
|
