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/*-
* ============LICENSE_START=======================================================
* ONAP - SO
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* Copyright (C) 2017 Huawei Technologies Co., Ltd. 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.openecomp.mso.bpmn.common.workflow.service;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicLong;
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;
import org.camunda.bpm.engine.HistoryService;
import org.camunda.bpm.engine.ProcessEngineException;
import org.camunda.bpm.engine.ProcessEngineServices;
import org.camunda.bpm.engine.RuntimeService;
import org.camunda.bpm.engine.history.HistoricVariableInstance;
import org.camunda.bpm.engine.runtime.ProcessInstance;
import org.camunda.bpm.engine.variable.VariableMap;
import org.camunda.bpm.engine.variable.Variables;
import org.camunda.bpm.engine.variable.Variables.SerializationDataFormats;
import org.camunda.bpm.engine.variable.impl.VariableMapImpl;
import org.openecomp.mso.bpmn.core.WorkflowException;
import org.openecomp.mso.logger.MessageEnum;
import org.openecomp.mso.logger.MsoLogger;
import org.slf4j.MDC;
@Path("/workflow")
public class WorkflowResource extends ProcessEngineAwareService {
private static final MsoLogger msoLogger = MsoLogger.getMsoLogger(MsoLogger.Catalog.BPEL);
private static final String LOGMARKER = "[WRKFLOW-RESOURCE]";
private static final int DEFAULT_WAIT_TIME = 30000;
@Context
private UriInfo uriInfo = null;
/**
* Starts the process instance and responds to client synchronously
* If the request does not contain mso-service-request-timeout then it waits for the value specified in DEFAULT_WAIT_TIME
* Note: value specified in mso-service-request-timeout is in seconds
* During polling time, if there is an exception encountered in the process execution then polling is stopped and the error response is
* returned to the client
* @param processKey
* @param variableMap
* @return
*/
@POST
@Path("/services/{processKey}")
@Produces("application/json")
@Consumes("application/json")
public Response startProcessInstanceByKey(@PathParam("processKey") String processKey,
VariableMapImpl variableMap) {
Map<String, Object> inputVariables = getInputVariables(variableMap);
setLogContext(processKey, inputVariables);
WorkflowResponse workflowResponse = new WorkflowResponse();
long startTime = System.currentTimeMillis();
ProcessInstance processInstance = null;
try {
//Kickoff the process
ProcessThread thread = new ProcessThread(inputVariables,processKey,msoLogger);
thread.start();
Map<String, Object> responseMap = null;
//wait for process to be completed
long waitTime = getWaitTime(inputVariables);
long now = System.currentTimeMillis();
long start = now;
long endTime = start + waitTime;
long pollingInterval = 500;
// TEMPORARY LOGIC FOR UNIT TEST REFACTORING
// If this is a unit test (method is invoked directly), wait a max
// of 5 seconds after process ended for a result. In production,
// wait up to 60 seconds.
long timeToWaitAfterProcessEnded = uriInfo == null ? 5000 : 60000;
AtomicLong timeProcessEnded = new AtomicLong(0);
boolean endedWithNoResponse = false;
while (now <= endTime) {
Thread.sleep(pollingInterval);
now = System.currentTimeMillis();
// Increase the polling interval over time
long elapsed = now - start;
if (elapsed > 60000) {
pollingInterval = 5000;
} else if (elapsed > 10000) {
pollingInterval = 1000;
}
Exception exception = thread.getException();
if (exception != null) {
throw new Exception(exception);
}
processInstance = thread.getProcessInstance();
if (processInstance == null) {
msoLogger.debug(LOGMARKER + processKey + " process has not been created yet");
continue;
}
String processInstanceId = processInstance.getId();
workflowResponse.setProcessInstanceID(processInstanceId);
responseMap = getResponseMap(processInstance, processKey, timeProcessEnded);
if (responseMap == null) {
msoLogger.debug(LOGMARKER + processKey + " has not produced a response yet");
if (timeProcessEnded.longValue() != 0) {
long elapsedSinceEnded = System.currentTimeMillis() - timeProcessEnded.longValue();
if (elapsedSinceEnded > timeToWaitAfterProcessEnded) {
endedWithNoResponse = true;
break;
}
}
} else {
processResponseMap(workflowResponse, responseMap);
recordEvents(processKey, workflowResponse, startTime);
return Response.status(workflowResponse.getMessageCode()).entity(workflowResponse).build();
}
}
//if we dont get response after waiting then send timeout response
String state;
String processInstanceId;
if (processInstance == null) {
processInstanceId = "N/A";
state = "NOT STARTED";
} else {
processInstanceId = processInstance.getProcessInstanceId();
state = isProcessEnded(processInstanceId) ? "ENDED" : "NOT ENDED";
}
workflowResponse.setMessage("Fail");
if (endedWithNoResponse) {
workflowResponse.setResponse("Process ended without producing a response");
} else {
workflowResponse.setResponse("Request timed out, process state: " + state);
}
workflowResponse.setProcessInstanceID(processInstanceId);
recordEvents(processKey, workflowResponse, startTime);
workflowResponse.setMessageCode(500);
return Response.status(500).entity(workflowResponse).build();
} catch (Exception ex) {
msoLogger.debug(LOGMARKER + "Exception in startProcessInstance by key",ex);
workflowResponse.setMessage("Fail" );
workflowResponse.setResponse("Error occurred while executing the process: " + ex.getMessage());
if (processInstance != null) workflowResponse.setProcessInstanceID(processInstance.getId());
msoLogger.error(MessageEnum.BPMN_GENERAL_EXCEPTION_ARG, "BPMN", MDC.get(processKey),
MsoLogger.ErrorCode.UnknownError, LOGMARKER + workflowResponse.getMessage()
+ " for processKey: " + processKey + " with response: " + workflowResponse.getResponse());
workflowResponse.setMessageCode(500);
recordEvents(processKey, workflowResponse, startTime);
return Response.status(500).entity(workflowResponse).build();
}
}
/**
* Returns the wait time, this is used by the resource on how long it should wait to send a response
* If none specified DEFAULT_WAIT_TIME is used
* @param inputVariables
* @return
*/
private int getWaitTime(Map<String, Object> inputVariables)
{
String timeout = inputVariables.get("mso-service-request-timeout") == null
? null : inputVariables.get("mso-service-request-timeout").toString();
if (timeout != null) {
try {
return Integer.parseInt(timeout)*1000;
} catch (NumberFormatException nex) {
msoLogger.debug("Invalid input for mso-service-request-timeout");
}
}
return DEFAULT_WAIT_TIME;
}
private void recordEvents(String processKey, WorkflowResponse response, long startTime) {
msoLogger.recordMetricEvent ( startTime, MsoLogger.StatusCode.COMPLETE, MsoLogger.ResponseCode.Suc,
LOGMARKER + response.getMessage() + " for processKey: "
+ processKey + " with response: " + response.getResponse(), "BPMN", MDC.get(processKey), null);
msoLogger.recordAuditEvent (startTime, MsoLogger.StatusCode.COMPLETE, MsoLogger.ResponseCode.Suc,
LOGMARKER + response.getMessage() + " for processKey: "
+ processKey + " with response: " + response.getResponse());
}
private void setLogContext(String processKey, Map<String, Object> inputVariables) {
MsoLogger.setServiceName("MSO." + processKey);
if (inputVariables != null) {
MsoLogger.setLogContext(getValueFromInputVariables(inputVariables, "mso-request-id"),
getValueFromInputVariables(inputVariables, "mso-service-instance-id"));
}
}
private String getValueFromInputVariables(Map<String,Object> inputVariables, String key) {
Object value = inputVariables.get(key);
if (value == null) {
return "N/A";
} else {
return value.toString();
}
}
/**
* Checks to see if the specified process is ended.
* @param processInstanceId the process instance ID
* @return true if the process is ended
*/
private boolean isProcessEnded(String processInstanceId) {
ProcessEngineServices pes = getProcessEngineServices();
try {
return pes.getRuntimeService().createProcessInstanceQuery().processInstanceId(processInstanceId).singleResult() == null ? true : false ;
} catch (Exception e) {
msoLogger.debug("Exception :",e);
return true;
}
}
private void processResponseMap(WorkflowResponse workflowResponse, Map<String, Object> responseMap) {
Object object = responseMap.get("Response");
String response = object == null ? null : String.valueOf(object);
if(response == null){
object = responseMap.get("WorkflowResponse");
response = object == null ? null : String.valueOf(object);
}
workflowResponse.setResponse(response);
object = responseMap.get("ResponseCode");
String responseCode = object == null ? null : String.valueOf(object);
try {
workflowResponse.setMessageCode(Integer.parseInt(responseCode));
} catch(NumberFormatException nex) {
msoLogger.debug(LOGMARKER + "Failed to parse ResponseCode: " + responseCode);
workflowResponse.setMessageCode(-1);
}
Object status = responseMap.get("Status");
if ("Success".equalsIgnoreCase(String.valueOf(status))) {
workflowResponse.setMessage("Success");
} else if ("Fail".equalsIgnoreCase(String.valueOf(status))) {
workflowResponse.setMessage("Fail");
} else {
msoLogger.debug(LOGMARKER + "Unrecognized Status: " + responseCode);
workflowResponse.setMessage("Fail");
}
}
/**
* @version 1.0
* Triggers the workflow in a separate thread
*/
private class ProcessThread extends Thread {
private final Map<String,Object> inputVariables;
private final String processKey;
private final MsoLogger msoLogger;
private final String businessKey;
private ProcessInstance processInstance = null;
private Exception exception = null;
public ProcessThread(Map<String, Object> inputVariables, String processKey, MsoLogger msoLogger) {
this.inputVariables = inputVariables;
this.processKey = processKey;
this.msoLogger = msoLogger;
this.businessKey = UUID.randomUUID().toString();
}
/**
* If an exception occurs when starting the process instance, it may
* be obtained by calling this method. Note that exceptions are only
* recorded while the process is executing in its original thread.
* Once a process is suspended, exception recording stops.
* @return the exception, or null if none has occurred
*/
public Exception getException() {
return exception;
}
public ProcessInstance getProcessInstance() {
return this.processInstance;
}
/**
* Sets the process instance exception.
* @param exception the exception
*/
private void setException(Exception exception) {
this.exception = exception;
}
public void run() {
setLogContext(processKey, inputVariables);
long startTime = System.currentTimeMillis();
try {
msoLogger.debug(LOGMARKER + "***Received MSO startProcessInstanceByKey with processKey:"
+ processKey + " and variables: " + inputVariables);
msoLogger.recordAuditEvent (startTime, MsoLogger.StatusCode.COMPLETE, MsoLogger.ResponseCode.Suc, LOGMARKER
+ "Call to MSO workflow/services in Camunda. Received MSO startProcessInstanceByKey with"
+ " processKey:" + processKey
+ " businessKey:" + businessKey
+ " variables: " + inputVariables);
RuntimeService runtimeService = getProcessEngineServices().getRuntimeService();
// Note that this method doesn't return until the process suspends
// itself or finishes. We provide a business key so we can identify
// the process instance immediately.
processInstance = runtimeService.startProcessInstanceByKey(
processKey, inputVariables);
} catch (Exception e) {
msoLogger.debug(LOGMARKER + "ProcessThread caught an exception executing "
+ processKey + ": " + e);
setException(e);
}
}
}
private Map<String, Object> getInputVariables(VariableMapImpl variableMap) {
VariableMap inputVariables = Variables.createVariables();
@SuppressWarnings("unchecked")
Map<String, Object> vMap = (Map<String, Object>) variableMap.get("variables");
for (String key : vMap.keySet()) { //variabe name vn
@SuppressWarnings("unchecked")
Map<String, Object> valueMap = (Map<String,Object>)vMap.get(key); //value, type
inputVariables.putValueTyped(key, Variables
.objectValue(valueMap.get("value"))
.serializationDataFormat(SerializationDataFormats.JAVA) // tells the engine to use java serialization for persisting the value
.create());
}
return inputVariables;
}
/**
* Attempts to get a response map from the specified process instance.
* @return the response map, or null if it is unavailable
*/
private Map<String, Object> getResponseMap(ProcessInstance processInstance,
String processKey, AtomicLong timeProcessEnded) {
String responseMapVariable = processKey + "ResponseMap";
String processInstanceId = processInstance.getId();
// Query the runtime service to see if a response map is ready.
/* RuntimeService runtimeService = getProcessEngineServices().getRuntimeService();
List<Execution> executions = runtimeService.createExecutionQuery()
.processInstanceId(processInstanceId).list();
for (Execution execution : executions) {
@SuppressWarnings("unchecked")
Map<String, Object> responseMap = (Map<String, Object>)
getVariableFromExecution(runtimeService, execution.getId(),
responseMapVariable);
if (responseMap != null) {
msoLogger.debug(LOGMARKER + "Obtained " + responseMapVariable
+ " from process " + processInstanceId + " execution "
+ execution.getId());
return responseMap;
}
}
*/
//Querying history seem to return consistent results compared to querying the runtime service
boolean alreadyEnded = timeProcessEnded.longValue() != 0;
if (alreadyEnded || isProcessEnded(processInstance.getId())) {
if (!alreadyEnded) {
timeProcessEnded.set(System.currentTimeMillis());
}
// Query the history service to see if a response map exists.
HistoryService historyService = getProcessEngineServices().getHistoryService();
@SuppressWarnings("unchecked")
Map<String, Object> responseMap = (Map<String, Object>)
getVariableFromHistory(historyService, processInstance.getId(),
responseMapVariable);
if (responseMap != null) {
msoLogger.debug(LOGMARKER + "Obtained " + responseMapVariable
+ " from process " + processInstanceId + " history");
return responseMap;
}
// Query the history service for old-style response variables.
String prefix = (String) getVariableFromHistory(historyService, processInstanceId, "prefix");
if (prefix != null) {
// Check for 'WorkflowResponse' variable
Object workflowResponseObject = getVariableFromHistory(historyService, processInstanceId, "WorkflowResponse");
String workflowResponse = workflowResponseObject == null ? null : String.valueOf(workflowResponseObject);
msoLogger.debug(LOGMARKER + "WorkflowResponse: " + workflowResponse);
if (workflowResponse != null) {
Object responseCodeObject = getVariableFromHistory(historyService, processInstanceId, prefix + "ResponseCode");
String responseCode = responseCodeObject == null ? null : String.valueOf(responseCodeObject);
msoLogger.debug(LOGMARKER + prefix + "ResponseCode: " + responseCode);
responseMap = new HashMap<String, Object>();
responseMap.put("WorkflowResponse", workflowResponse);
responseMap.put("ResponseCode", responseCode);
responseMap.put("Status", "Success");
return responseMap;
}
// Check for 'WorkflowException' variable
WorkflowException workflowException = null;
String workflowExceptionText = null;
Object workflowExceptionObject = getVariableFromHistory(historyService, processInstanceId, "WorkflowException");
if(workflowExceptionObject != null) {
if(workflowExceptionObject instanceof WorkflowException) {
workflowException = (WorkflowException) workflowExceptionObject;
workflowExceptionText = workflowException.toString();
responseMap = new HashMap<String, Object>();
responseMap.put("WorkflowException", workflowExceptionText);
responseMap.put("ResponseCode", workflowException.getErrorCode());
responseMap.put("Status", "Fail");
return responseMap;
}
else if (workflowExceptionObject instanceof String) {
Object object = getVariableFromHistory(historyService, processInstanceId, prefix + "ResponseCode");
String responseCode = object == null ? null : String.valueOf(object);
workflowExceptionText = (String) workflowExceptionObject;
responseMap = new HashMap<String, Object>();
responseMap.put("WorkflowException", workflowExceptionText);
responseMap.put("ResponseCode", responseCode);
responseMap.put("Status", "Fail");
return responseMap;
}
}
msoLogger.debug(LOGMARKER + "WorkflowException: " + workflowExceptionText);
// BEGIN LEGACY SUPPORT. TODO: REMOVE THIS CODE
Object object = getVariableFromHistory(historyService, processInstanceId, processKey + "Response");
String response = object == null ? null : String.valueOf(object);
msoLogger.debug(LOGMARKER + processKey + "Response: " + response);
if (response != null) {
object = getVariableFromHistory(historyService, processInstanceId, prefix + "ResponseCode");
String responseCode = object == null ? null : String.valueOf(object);
msoLogger.debug(LOGMARKER + prefix + "ResponseCode: " + responseCode);
responseMap = new HashMap<String, Object>();
responseMap.put("Response", response);
responseMap.put("ResponseCode", responseCode);
responseMap.put("Status", "Success");
return responseMap;
}
object = getVariableFromHistory(historyService, processInstanceId, prefix + "ErrorResponse");
String errorResponse = object == null ? null : String.valueOf(object);
msoLogger.debug(LOGMARKER + prefix + "ErrorResponse: " + errorResponse);
if (errorResponse != null) {
object = getVariableFromHistory(historyService, processInstanceId, prefix + "ResponseCode");
String responseCode = object == null ? null : String.valueOf(object);
msoLogger.debug(LOGMARKER + prefix + "ResponseCode: " + responseCode);
responseMap = new HashMap<String, Object>();
responseMap.put("Response", errorResponse);
responseMap.put("ResponseCode", responseCode);
responseMap.put("Status", "Fail");
return responseMap;
}
// END LEGACY SUPPORT. TODO: REMOVE THIS CODE
}
}
return null;
}
/**
* Gets a variable value from the specified execution.
* @return the variable value, or null if the variable could not be
* obtained
*/
private Object getVariableFromExecution(RuntimeService runtimeService,
String executionId, String variableName) {
try {
return runtimeService.getVariable(executionId, variableName);
} catch (ProcessEngineException e) {
// Most likely cause is that the execution no longer exists.
msoLogger.debug("Error retrieving execution " + executionId
+ " variable " + variableName + ": " + e);
return null;
}
}
/**
* Gets a variable value from specified historical process instance.
* @return the variable value, or null if the variable could not be
* obtained
*/
private Object getVariableFromHistory(HistoryService historyService,
String processInstanceId, String variableName) {
try {
HistoricVariableInstance v = historyService.createHistoricVariableInstanceQuery()
.processInstanceId(processInstanceId).variableName(variableName).singleResult();
return v == null ? null : v.getValue();
} catch (Exception e) {
msoLogger.debug("Error retrieving process " + processInstanceId
+ " variable " + variableName + " from history: " + e);
return null;
}
}
@POST
@Path("/services/{processKey}/{processInstanceId}")
@Produces("application/json")
@Consumes("application/json")
public WorkflowResponse getProcessVariables(@PathParam("processKey") String processKey, @PathParam("processInstanceId") String processInstanceId) {
//TODO filter only set of variables
WorkflowResponse response = new WorkflowResponse();
long startTime = System.currentTimeMillis();
try {
ProcessEngineServices engine = getProcessEngineServices();
List<HistoricVariableInstance> variables = engine.getHistoryService().createHistoricVariableInstanceQuery().processInstanceId(processInstanceId).list();
Map<String,String> variablesMap = new HashMap<String,String>();
for (HistoricVariableInstance variableInstance: variables) {
variablesMap.put(variableInstance.getName(), variableInstance.getValue().toString());
}
msoLogger.debug(LOGMARKER + "***Received MSO getProcessVariables with processKey:" + processKey + " and variables: " + variablesMap.toString());
msoLogger.recordAuditEvent (startTime, MsoLogger.StatusCode.COMPLETE, MsoLogger.ResponseCode.Suc, LOGMARKER
+ "Call to MSO workflow/services in Camunda. Received MSO getProcessVariables with processKey:"
+ processKey + " and variables: "
+ variablesMap.toString());
response.setVariables(variablesMap);
response.setMessage("Success");
response.setResponse("Successfully retrieved the variables");
response.setProcessInstanceID(processInstanceId);
msoLogger.debug(LOGMARKER + response.getMessage() + " for processKey: " + processKey + " with response: " + response.getResponse());
} catch (Exception ex) {
response.setMessage("Fail");
response.setResponse("Failed to retrieve the variables," + ex.getMessage());
response.setProcessInstanceID(processInstanceId);
msoLogger.error (MessageEnum.BPMN_GENERAL_EXCEPTION_ARG, "BPMN", MDC.get(processKey), MsoLogger.ErrorCode.UnknownError, LOGMARKER
+ response.getMessage()
+ " for processKey: "
+ processKey
+ " with response: "
+ response.getResponse());
msoLogger.debug("Exception :",ex);
}
msoLogger.recordMetricEvent ( startTime, MsoLogger.StatusCode.COMPLETE, MsoLogger.ResponseCode.Suc,
LOGMARKER + response.getMessage() + " for processKey: "
+ processKey + " with response: " + response.getResponse(), "BPMN", MDC.get(processKey), null);
msoLogger.recordAuditEvent (startTime, MsoLogger.StatusCode.COMPLETE, MsoLogger.ResponseCode.Suc,
LOGMARKER + response.getMessage() + " for processKey: "
+ processKey + " with response: " + response.getResponse());
return response;
}
}
|