/*
* 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 com.facebook.presto.server;
import com.facebook.presto.client.ServerInfo;
import com.facebook.presto.spi.NodeState;
import javax.inject.Inject;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import static com.facebook.presto.spi.NodeState.ACTIVE;
import static com.facebook.presto.spi.NodeState.SHUTTING_DOWN;
import static java.lang.String.format;
import static java.util.Objects.requireNonNull;
import static javax.ws.rs.core.MediaType.APPLICATION_JSON;
import static javax.ws.rs.core.MediaType.TEXT_PLAIN;
import static javax.ws.rs.core.Response.Status.BAD_REQUEST;
@Path("/v1/info")
public class ServerInfoResource
{
private final ServerInfo serverInfo;
private final GracefulShutdownHandler shutdownHandler;
@Inject
public ServerInfoResource(ServerInfo serverInfo, GracefulShutdownHandler shutdownHandler)
{
this.serverInfo = requireNonNull(serverInfo, "serverInfo is null");
this.shutdownHandler = requireNonNull(shutdownHandler, "shutdownHandler is null");
}
@GET
@Produces(APPLICATION_JSON)
public ServerInfo getServerInfo()
{
return serverInfo;
}
@PUT
@Path("state")
@Consumes(APPLICATION_JSON)
@Produces(TEXT_PLAIN)
public Response updateState(NodeState state)
throws WebApplicationException
{
requireNonNull(state, "state is null");
switch (state) {
case SHUTTING_DOWN:
shutdownHandler.requestShutdown();
return Response.ok().build();
case ACTIVE:
case INACTIVE:
throw new WebApplicationException(Response
.status(BAD_REQUEST)
.type(MediaType.TEXT_PLAIN)
.entity(format("Invalid state transition to %s", state))
.build());
default:
return Response.status(BAD_REQUEST)
.type(TEXT_PLAIN)
.entity(format("Invalid state %s", state))
.build();
}
}
@GET
@Path("state")
@Produces(APPLICATION_JSON)
public NodeState getServerState()
{
if (shutdownHandler.isShutdownRequested()) {
return SHUTTING_DOWN;
}
else {
return ACTIVE;
}
}
@GET
@Path("coordinator")
@Produces(TEXT_PLAIN)
public Response getServerCoordinator()
{
if (serverInfo.isCoordinator()) {
return Response.ok().build();
}
// return 404 to allow load balancers to only send traffic to the coordinator
return Response.status(Response.Status.NOT_FOUND).build();
}
}