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package cask.main
import cask.endpoints.{WebsocketResult, WsHandler}
import cask.model._
import cask.internal.{DispatchTrie, Util}
import cask.main
import cask.router.{Decorator, EndpointMetadata, EntryPoint, RawDecorator, Result}
import cask.util.Logger
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 Main 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.
*/
abstract class Main{
def mainDecorators: Seq[Decorator[_, _]] = Nil
def allRoutes: Seq[Routes]
def port: Int = 8080
def host: String = "localhost"
def debugMode: Boolean = true
implicit def log = new cask.util.Logger.Console()
def routeTries = Main.prepareRouteTries(allRoutes)
def defaultHandler = new BlockingHandler(
new Main.DefaultHandler(routeTries, mainDecorators, debugMode, handleNotFound, handleEndpointError)
)
def handleNotFound() = Main.defaultHandleNotFound()
def handleEndpointError(routes: Routes,
metadata: EndpointMetadata[_],
e: cask.router.Result.Error) = {
Main.defaultHandleError(routes, metadata, e, debugMode)
}
def main(args: Array[String]): Unit = {
val server = Undertow.builder
.addHttpListener(port, host)
.setHandler(defaultHandler)
.build
server.start()
}
}
object Main{
class DefaultHandler(routeTries: Map[String, DispatchTrie[(Routes, EndpointMetadata[_])]],
mainDecorators: Seq[Decorator[_, _]],
debugMode: Boolean,
handleNotFound: () => Response.Raw,
handleError: (Routes, EndpointMetadata[_], Result.Error) => Response.Raw)
(implicit log: Logger) extends HttpHandler() {
def handleRequest(exchange: HttpServerExchange): Unit = try {
// println("Handling Request: " + exchange.getRequestPath)
val (effectiveMethod, runner) = if (exchange.getRequestHeaders.getFirst("Upgrade") == "websocket") {
Tuple2(
"websocket",
(r: Any) =>
r.asInstanceOf[WebsocketResult] match{
case l: WsHandler =>
io.undertow.Handlers.websocket(l).handleRequest(exchange)
case l: WebsocketResult.Listener =>
io.undertow.Handlers.websocket(l.value).handleRequest(exchange)
case r: WebsocketResult.Response[Response.Data] =>
Main.writeResponse(exchange, r.value)
}
)
} else Tuple2(
exchange.getRequestMethod.toString.toLowerCase(),
(r: Any) => Main.writeResponse(exchange, r.asInstanceOf[Response.Raw])
)
routeTries(effectiveMethod).lookup(Util.splitPath(exchange.getRequestPath).toList, Map()) match {
case None => Main.writeResponse(exchange, handleNotFound())
case Some(((routes, metadata), routeBindings, remaining)) =>
Decorator.invoke(
Request(exchange, remaining),
metadata.endpoint,
metadata.entryPoint.asInstanceOf[EntryPoint[Routes, _]],
routes,
routeBindings,
(mainDecorators ++ routes.decorators ++ metadata.decorators).toList,
Nil
) match{
case Result.Success(res) => runner(res)
case e: Result.Error =>
Main.writeResponse(
exchange,
handleError(routes, metadata, e)
)
None
}
}
// println("Completed Request: " + exchange.getRequestPath)
}catch{case e: Throwable =>
e.printStackTrace()
}
}
def defaultHandleNotFound(): Response.Raw = {
Response(
s"Error 404: ${Status.codesToStatus(404).reason}",
statusCode = 404
)
}
def prepareRouteTries(allRoutes: Seq[Routes]) = {
val routeList = for{
routes <- allRoutes
route <- routes.caskMetadata.value.map(x => x: EndpointMetadata[_])
} yield (routes, route)
Seq("get", "put", "post", "websocket")
.map { method =>
method -> DispatchTrie.construct[(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 defaultHandleError(routes: Routes,
metadata: EndpointMetadata[_],
e: Result.Error,
debugMode: Boolean)
(implicit log: Logger) = {
e match {
case e: Result.Error.Exception => log.exception(e.t)
case _ => // do nothing
}
val statusCode = e match {
case _: Result.Error.Exception => 500
case _: Result.Error.InvalidArguments => 400
case _: 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
)
Response(str, statusCode = statusCode)
}
}
|
