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/*-
* ========================LICENSE_START=================================
* ONAP : ccsdk oran
* ======================================================================
* Copyright (C) 2020 Nordix Foundation. All rights reserved.
* ======================================================================
* 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.
* ========================LICENSE_END===================================
*/
package org.onap.ccsdk.oran.a1policymanagementservice.dmaap;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonObject;
import java.lang.invoke.MethodHandles;
import org.onap.ccsdk.oran.a1policymanagementservice.clients.AsyncRestClient;
import org.onap.ccsdk.oran.a1policymanagementservice.dmaap.DmaapRequestMessage.Operation;
import org.onap.ccsdk.oran.a1policymanagementservice.exceptions.ServiceException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.reactive.function.client.WebClientException;
import org.springframework.web.reactive.function.client.WebClientResponseException;
import reactor.core.publisher.Mono;
/**
* The class handles incoming requests from DMAAP.
* <p>
* That means: invoke a REST call towards this services and to send back a
* response though DMAAP
*/
public class DmaapMessageHandler {
private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
private static Gson gson = new GsonBuilder().create();
private final AsyncRestClient dmaapClient;
private final AsyncRestClient pmsClient;
public DmaapMessageHandler(AsyncRestClient dmaapClient, AsyncRestClient pmsClient) {
this.pmsClient = pmsClient;
this.dmaapClient = dmaapClient;
}
public Mono<String> handleDmaapMsg(DmaapRequestMessage dmaapRequestMessage) {
return this.invokePolicyManagementService(dmaapRequestMessage) //
.onErrorResume(t -> handlePolicyManagementServiceCallError(t, dmaapRequestMessage)) //
.flatMap(response -> sendDmaapResponse(response.getBody(), dmaapRequestMessage,
response.getStatusCode()))
.doOnError(t -> logger.warn("Failed to handle DMAAP message : {}", t.getMessage()))//
.onErrorResume(t -> Mono.empty());
}
private Mono<ResponseEntity<String>> handlePolicyManagementServiceCallError(Throwable error,
DmaapRequestMessage dmaapRequestMessage) {
logger.debug("Policy Management Service call failed: {}", error.getMessage());
HttpStatus status = HttpStatus.INTERNAL_SERVER_ERROR;
String errorMessage = error.getMessage();
if (error instanceof WebClientResponseException) {
WebClientResponseException exception = (WebClientResponseException) error;
status = exception.getStatusCode();
errorMessage = exception.getResponseBodyAsString();
} else if (error instanceof ServiceException) {
status = HttpStatus.BAD_REQUEST;
errorMessage = error.getMessage();
} else if (!(error instanceof WebClientException)) {
logger.warn("Unexpected exception ", error);
}
return sendDmaapResponse(errorMessage, dmaapRequestMessage, status) //
.flatMap(notUsed -> Mono.empty());
}
public Mono<String> sendDmaapResponse(String response, DmaapRequestMessage dmaapRequestMessage, HttpStatus status) {
return createDmaapResponseMessage(dmaapRequestMessage, response, status) //
.flatMap(this::sendToDmaap) //
.onErrorResume(this::handleResponseCallError);
}
private Mono<ResponseEntity<String>> invokePolicyManagementService(DmaapRequestMessage dmaapRequestMessage) {
DmaapRequestMessage.Operation operation = dmaapRequestMessage.getOperation();
String uri = dmaapRequestMessage.getUrl();
if (operation == Operation.DELETE) {
return pmsClient.deleteForEntity(uri);
} else if (operation == Operation.GET) {
return pmsClient.getForEntity(uri);
} else if (operation == Operation.PUT) {
return pmsClient.putForEntity(uri, payload(dmaapRequestMessage));
} else if (operation == Operation.POST) {
return pmsClient.postForEntity(uri, payload(dmaapRequestMessage));
} else {
return Mono.error(new ServiceException("Not implemented operation: " + operation));
}
}
private String payload(DmaapRequestMessage message) {
JsonObject payload = message.getPayload();
if (payload != null) {
return gson.toJson(payload);
} else {
logger.warn("Expected payload in message from DMAAP: {}", message);
return "";
}
}
private Mono<String> sendToDmaap(String body) {
logger.debug("sendToDmaap: {} ", body);
return dmaapClient.post("", "[" + body + "]");
}
private Mono<String> handleResponseCallError(Throwable t) {
logger.warn("Failed to send response to DMaaP: {}", t.getMessage());
return Mono.empty();
}
private Mono<String> createDmaapResponseMessage(DmaapRequestMessage dmaapRequestMessage, String response,
HttpStatus status) {
DmaapResponseMessage dmaapResponseMessage = DmaapResponseMessage.builder() //
.status(status.toString()) //
.message(response == null ? "" : response) //
.type("response") //
.correlationId(
dmaapRequestMessage.getCorrelationId() == null ? "" : dmaapRequestMessage.getCorrelationId()) //
.originatorId(
dmaapRequestMessage.getOriginatorId() == null ? "" : dmaapRequestMessage.getOriginatorId()) //
.requestId(dmaapRequestMessage.getRequestId() == null ? "" : dmaapRequestMessage.getRequestId()) //
.timestamp(dmaapRequestMessage.getTimestamp() == null ? "" : dmaapRequestMessage.getTimestamp()) //
.build();
String str = gson.toJson(dmaapResponseMessage);
return Mono.just(str);
}
}
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