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BlockingHttp4sServlet.scala
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BlockingHttp4sServlet.scala
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/*
* Copyright 2013 http4s.org
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.http4s
package servlet
import cats.effect.kernel.Async
import cats.effect.kernel.Sync
import cats.effect.std.Dispatcher
import cats.syntax.all._
import org.http4s.server._
import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse
class BlockingHttp4sServlet[F[_]] private (
service: HttpApp[F],
servletIo: ServletIo[F],
serviceErrorHandler: ServiceErrorHandler[F],
dispatcher: Dispatcher[F],
)(implicit F: Sync[F])
extends Http4sServlet[F](service, servletIo, dispatcher) {
def this(
service: HttpApp[F],
servletIo: BlockingServletIo[F],
serviceErrorHandler: ServiceErrorHandler[F],
dispatcher: Dispatcher[F],
)(implicit F: Sync[F]) =
this(service, servletIo: ServletIo[F], serviceErrorHandler, dispatcher)(F)
@deprecated("Binary compatibility", "0.23.12")
private[servlet] def this(
service: HttpApp[F],
servletIo: ServletIo[F],
serviceErrorHandler: ServiceErrorHandler[F],
dispatcher: Dispatcher[F],
async: Async[F],
) =
this(service, servletIo, serviceErrorHandler, dispatcher)(async: Sync[F])
override def service(
servletRequest: HttpServletRequest,
servletResponse: HttpServletResponse,
): Unit = {
val result = F
.defer {
val bodyWriter = servletIo.initWriter(servletResponse)
val render = toRequest(servletRequest).fold(
onParseFailure(_, servletResponse),
handleRequest(_, servletResponse, bodyWriter),
)
render
}
.handleErrorWith(errorHandler(servletResponse))
dispatcher.unsafeRunSync(result)
}
private def handleRequest(
request: Request[F],
servletResponse: HttpServletResponse,
bodyWriter: BodyWriter[F],
): F[Unit] =
// Note: We're catching silly user errors in the lift => flatten.
F.defer(serviceFn(request))
.recoverWith(serviceErrorHandler(request))
.flatMap(renderResponse(_, servletResponse, bodyWriter))
private def errorHandler(servletResponse: HttpServletResponse)(t: Throwable): F[Unit] =
F.defer {
if (servletResponse.isCommitted) {
logger.error(t)("Error processing request after response was committed")
F.unit
} else {
logger.error(t)("Error processing request")
val response = Response[F](Status.InternalServerError)
// We don't know what I/O mode we're in here, and we're not rendering a body
// anyway, so we use a NullBodyWriter.
renderResponse(response, servletResponse, nullBodyWriter)
}
}
}
object BlockingHttp4sServlet {
def apply[F[_]: Sync](
service: HttpApp[F],
servletIo: ServletIo[F],
dispatcher: Dispatcher[F],
): BlockingHttp4sServlet[F] =
new BlockingHttp4sServlet[F](
service,
servletIo,
DefaultServiceErrorHandler,
dispatcher,
)
@deprecated(
"Preserved for binary compatibility. Use the overload with the implicit Sync",
"0.23.12",
)
def apply[F[_]](
service: HttpApp[F],
servletIo: ServletIo[F],
dispatcher: Dispatcher[F],
async: Async[F],
): BlockingHttp4sServlet[F] =
apply(service, servletIo, dispatcher)(async: Sync[F])
}