package com.elastisys.scale.cloudadapers.api.restapi;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.elastisys.scale.cloudadapers.api.CloudAdapter;
import com.elastisys.scale.commons.rest.types.ErrorType;
import com.google.common.base.Optional;
import com.google.gson.JsonObject;
/**
* A REST response handler that handles requests to get ({@code GET}) and set (
* {@code POST}) the {@link CloudAdapter} configuration.
* <p/>
* <i>Note: this is an optional extension of the {@link CloudAdapter} REST API,
* and is merely provided to facilitate remote (re-)configuration of a
* {@link CloudAdapter}.</i>
*
*
*
*/
@Path("/config")
public class ConfigHandler {
static Logger log = LoggerFactory.getLogger(ConfigHandler.class);
/** The {@link CloudAdapter} implementation to which all work is delegated. */
private final CloudAdapter cloudAdapter;
public ConfigHandler(CloudAdapter cloudAdapter) {
log.info(getClass().getSimpleName() + " created");
this.cloudAdapter = cloudAdapter;
}
/**
* Retrieves the configuration currently set for the {@link CloudAdapter}.
* <p/>
* <i>Note: this is an optional extension of the cloud adapter REST API
* provided to facilitate remote re-configuration of a {@link CloudAdapter}.
* A cloud adapter is not required to respond to this type of requests.</i>
*
* @return <ul>
* <li>On success: HTTP response code 200 with a JSON-formatted
* configuration.</li> <li>On error: HTTP response code 500 with an
* {@link ErrorType} message.</li>
* </ul>
*/
@GET
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public Response getConfig() {
log.info("GET /config");
try {
Optional<JsonObject> configuration = this.cloudAdapter
.getConfiguration();
if (!configuration.isPresent()) {
ErrorType entity = new ErrorType(
"no cloud adapter configuration has been set");
return Response.status(Status.NOT_FOUND).entity(entity).build();
}
return Response.ok(configuration.get()).build();
} catch (Exception e) {
String message = "failure to process config get request: "
+ e.getMessage();
log.error(message, e);
return Response.status(Status.INTERNAL_SERVER_ERROR)
.entity(new ErrorType(message, e)).build();
}
}
/**
* Sets the configuration for the {@link CloudAdapter}.
* <p/>
* <i>Note: this is an optional extension of the cloud adapter REST API
* provided to facilitate remote re-configuration of a {@link CloudAdapter}.
* A cloud adapter is not required to respond to this type of requests.</i>
*
* @param configuration
* The (JSON) configuration document to set.
* @return <ul>
* <li>On success: HTTP response code 200 without content.</li> <li>
* On error:
* <ul>
* <li>on illegal input: HTTP response code 400 with an
* {@link ErrorType} message</li> <li>otherwise: HTTP response code
* 500 with an {@link ErrorType} message</li>
* </ul>
* </ul>
*/
@POST
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public Response setConfig(JsonObject configuration) {
log.info("POST /config");
try {
this.cloudAdapter.configure(configuration);
return Response.ok().build();
} catch (IllegalArgumentException e) {
String message = "illegal input: " + e.getMessage();
log.error(message, e);
return Response.status(Status.BAD_REQUEST)
.entity(new ErrorType(message, e)).build();
} catch (Exception e) {
String message = "failure to process config set request: "
+ e.getMessage();
log.error(message, e);
return Response.status(Status.INTERNAL_SERVER_ERROR)
.entity(new ErrorType(message, e)).build();
}
}
}