/*
* Copyright 2012 LinkedIn Corp.
*
* 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 azkaban.execapp;
import com.google.common.base.Preconditions;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import org.codehaus.jackson.map.ObjectMapper;
import azkaban.constants.ServerInternals;
import azkaban.executor.ConnectorParams;
import azkaban.executor.ExecutableFlowBase;
import azkaban.executor.Executor;
import azkaban.executor.ExecutorLoader;
import azkaban.executor.ExecutorManagerException;
import azkaban.utils.FileIOUtils.JobMetaData;
import azkaban.utils.FileIOUtils.LogData;
import azkaban.utils.JSONUtils;
public class ExecutorServlet extends HttpServlet implements ConnectorParams {
private static final long serialVersionUID = 1L;
private static final Logger logger = Logger.getLogger(ExecutorServlet.class
.getName());
public static final String JSON_MIME_TYPE = "application/json";
private AzkabanExecutorServer application;
private FlowRunnerManager flowRunnerManager;
public ExecutorServlet() {
super();
}
@Override
public void init(ServletConfig config) throws ServletException {
application =
(AzkabanExecutorServer) config.getServletContext().getAttribute(
ServerInternals.AZKABAN_SERVLET_CONTEXT_KEY);
if (application == null) {
throw new IllegalStateException(
"No batch application is defined in the servlet context!");
}
flowRunnerManager = application.getFlowRunnerManager();
}
protected void writeJSON(HttpServletResponse resp, Object obj)
throws IOException {
resp.setContentType(JSON_MIME_TYPE);
ObjectMapper mapper = new ObjectMapper();
OutputStream stream = resp.getOutputStream();
mapper.writeValue(stream, obj);
}
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
HashMap<String, Object> respMap = new HashMap<String, Object>();
// logger.info("ExecutorServer called by " + req.getRemoteAddr());
try {
if (!hasParam(req, ACTION_PARAM)) {
logger.error("Parameter action not set");
respMap.put("error", "Parameter action not set");
} else {
String action = getParam(req, ACTION_PARAM);
if (action.equals(UPDATE_ACTION)) {
// logger.info("Updated called");
handleAjaxUpdateRequest(req, respMap);
} else if (action.equals(PING_ACTION)) {
respMap.put("status", "alive");
} else if (action.equals(RELOAD_JOBTYPE_PLUGINS_ACTION)) {
logger.info("Reloading Jobtype plugins");
handleReloadJobTypePlugins(respMap);
} else if (action.equals(ACTIVATE)) {
logger.warn("Setting ACTIVE flag to true");
setActive(true, respMap);
} else if (action.equals(DEACTIVATE)) {
logger.warn("Setting ACTIVE flag to false");
setActive(false, respMap);
} else {
int execid = Integer.parseInt(getParam(req, EXECID_PARAM));
String user = getParam(req, USER_PARAM, null);
logger.info("User " + user + " has called action " + action + " on "
+ execid);
if (action.equals(METADATA_ACTION)) {
handleFetchMetaDataEvent(execid, req, resp, respMap);
} else if (action.equals(LOG_ACTION)) {
handleFetchLogEvent(execid, req, resp, respMap);
} else if (action.equals(ATTACHMENTS_ACTION)) {
handleFetchAttachmentsEvent(execid, req, resp, respMap);
} else if (action.equals(EXECUTE_ACTION)) {
handleAjaxExecute(req, respMap, execid);
} else if (action.equals(STATUS_ACTION)) {
handleAjaxFlowStatus(respMap, execid);
} else if (action.equals(CANCEL_ACTION)) {
logger.info("Cancel called.");
handleAjaxCancel(respMap, execid, user);
} else if (action.equals(PAUSE_ACTION)) {
logger.info("Paused called.");
handleAjaxPause(respMap, execid, user);
} else if (action.equals(RESUME_ACTION)) {
logger.info("Resume called.");
handleAjaxResume(respMap, execid, user);
} else if (action.equals(MODIFY_EXECUTION_ACTION)) {
logger.info("Modify Execution Action");
handleModifyExecutionRequest(respMap, execid, user, req);
} else {
logger.error("action: '" + action + "' not supported.");
respMap.put("error", "action: '" + action + "' not supported.");
}
}
}
} catch (Exception e) {
logger.error(e);
respMap.put(RESPONSE_ERROR, e.getMessage());
}
writeJSON(resp, respMap);
resp.flushBuffer();
}
private void handleModifyExecutionRequest(Map<String, Object> respMap,
int execId, String user, HttpServletRequest req) throws ServletException {
if (!hasParam(req, MODIFY_EXECUTION_ACTION_TYPE)) {
respMap.put(RESPONSE_ERROR, "Modification type not set.");
}
String modificationType = getParam(req, MODIFY_EXECUTION_ACTION_TYPE);
try {
if (MODIFY_RETRY_FAILURES.equals(modificationType)) {
flowRunnerManager.retryFailures(execId, user);
}
} catch (ExecutorManagerException e) {
logger.error(e);
respMap.put("error", e.getMessage());
}
}
private void handleFetchLogEvent(int execId, HttpServletRequest req,
HttpServletResponse resp, Map<String, Object> respMap)
throws ServletException {
String type = getParam(req, "type");
int startByte = getIntParam(req, "offset");
int length = getIntParam(req, "length");
resp.setContentType("text/plain");
resp.setCharacterEncoding("utf-8");
if (type.equals("flow")) {
LogData result;
try {
result = flowRunnerManager.readFlowLogs(execId, startByte, length);
respMap.putAll(result.toObject());
} catch (Exception e) {
logger.error(e);
respMap.put(RESPONSE_ERROR, e.getMessage());
}
} else {
int attempt = getIntParam(req, "attempt", 0);
String jobId = getParam(req, "jobId");
try {
LogData result =
flowRunnerManager.readJobLogs(execId, jobId, attempt, startByte,
length);
respMap.putAll(result.toObject());
} catch (Exception e) {
logger.error(e);
respMap.put("error", e.getMessage());
}
}
}
private void handleFetchAttachmentsEvent(int execId, HttpServletRequest req,
HttpServletResponse resp, Map<String, Object> respMap)
throws ServletException {
String jobId = getParam(req, "jobId");
int attempt = getIntParam(req, "attempt", 0);
try {
List<Object> result =
flowRunnerManager.readJobAttachments(execId, jobId, attempt);
respMap.put("attachments", result);
} catch (Exception e) {
logger.error(e);
respMap.put("error", e.getMessage());
}
}
private void handleFetchMetaDataEvent(int execId, HttpServletRequest req,
HttpServletResponse resp, Map<String, Object> respMap)
throws ServletException {
int startByte = getIntParam(req, "offset");
int length = getIntParam(req, "length");
resp.setContentType("text/plain");
resp.setCharacterEncoding("utf-8");
int attempt = getIntParam(req, "attempt", 0);
String jobId = getParam(req, "jobId");
try {
JobMetaData result =
flowRunnerManager.readJobMetaData(execId, jobId, attempt, startByte,
length);
respMap.putAll(result.toObject());
} catch (Exception e) {
logger.error(e);
respMap.put("error", e.getMessage());
}
}
@SuppressWarnings("unchecked")
private void handleAjaxUpdateRequest(HttpServletRequest req,
Map<String, Object> respMap) throws ServletException, IOException {
ArrayList<Object> updateTimesList =
(ArrayList<Object>) JSONUtils.parseJSONFromString(getParam(req,
UPDATE_TIME_LIST_PARAM));
ArrayList<Object> execIDList =
(ArrayList<Object>) JSONUtils.parseJSONFromString(getParam(req,
EXEC_ID_LIST_PARAM));
ArrayList<Object> updateList = new ArrayList<Object>();
for (int i = 0; i < execIDList.size(); ++i) {
long updateTime = JSONUtils.getLongFromObject(updateTimesList.get(i));
int execId = (Integer) execIDList.get(i);
ExecutableFlowBase flow = flowRunnerManager.getExecutableFlow(execId);
if (flow == null) {
Map<String, Object> errorResponse = new HashMap<String, Object>();
errorResponse.put(RESPONSE_ERROR, "Flow does not exist");
errorResponse.put(UPDATE_MAP_EXEC_ID, execId);
updateList.add(errorResponse);
continue;
}
if (flow.getUpdateTime() > updateTime) {
updateList.add(flow.toUpdateObject(updateTime));
}
}
respMap.put(RESPONSE_UPDATED_FLOWS, updateList);
}
private void handleAjaxExecute(HttpServletRequest req,
Map<String, Object> respMap, int execId) throws ServletException {
try {
flowRunnerManager.submitFlow(execId);
} catch (ExecutorManagerException e) {
e.printStackTrace();
logger.error(e);
respMap.put(RESPONSE_ERROR, e.getMessage());
}
}
private void handleAjaxFlowStatus(Map<String, Object> respMap, int execid) {
ExecutableFlowBase flow = flowRunnerManager.getExecutableFlow(execid);
if (flow == null) {
respMap.put(STATUS_PARAM, RESPONSE_NOTFOUND);
} else {
respMap.put(STATUS_PARAM, flow.getStatus().toString());
respMap.put(RESPONSE_UPDATETIME, flow.getUpdateTime());
}
}
private void handleAjaxPause(Map<String, Object> respMap, int execid,
String user) throws ServletException {
if (user == null) {
respMap.put(RESPONSE_ERROR, "user has not been set");
return;
}
try {
flowRunnerManager.pauseFlow(execid, user);
respMap.put(STATUS_PARAM, RESPONSE_SUCCESS);
} catch (ExecutorManagerException e) {
logger.error(e);
respMap.put(RESPONSE_ERROR, e.getMessage());
}
}
private void handleAjaxResume(Map<String, Object> respMap, int execid,
String user) throws ServletException {
if (user == null) {
respMap.put(RESPONSE_ERROR, "user has not been set");
return;
}
try {
flowRunnerManager.resumeFlow(execid, user);
respMap.put(STATUS_PARAM, RESPONSE_SUCCESS);
} catch (ExecutorManagerException e) {
e.printStackTrace();
respMap.put(RESPONSE_ERROR, e.getMessage());
}
}
private void handleAjaxCancel(Map<String, Object> respMap, int execid,
String user) throws ServletException {
if (user == null) {
respMap.put(RESPONSE_ERROR, "user has not been set");
return;
}
try {
flowRunnerManager.cancelFlow(execid, user);
respMap.put(STATUS_PARAM, RESPONSE_SUCCESS);
} catch (ExecutorManagerException e) {
logger.error(e);
respMap.put(RESPONSE_ERROR, e.getMessage());
}
}
private void handleReloadJobTypePlugins(Map<String, Object> respMap)
throws ServletException {
try {
flowRunnerManager.reloadJobTypePlugins();
respMap.put(STATUS_PARAM, RESPONSE_SUCCESS);
} catch (Exception e) {
logger.error(e);
respMap.put(RESPONSE_ERROR, e.getMessage());
}
}
private void setActive(boolean value, Map<String, Object> respMap)
throws ServletException {
try {
ExecutorLoader executorLoader = application.getExecutorLoader();
Executor executor = executorLoader.fetchExecutor(application.getHost(), application.getPort());
Preconditions.checkState(executor != null, "Unable to obtain self entry in DB");
if (executor.isActive() != value) {
executor.setActive(value);
executorLoader.updateExecutor(executor);
} else {
logger.warn("Set active action ignored. Executor is already " + (value? "active" : "inactive"));
}
respMap.put(STATUS_PARAM, RESPONSE_SUCCESS);
} catch (Exception e) {
logger.error(e);
respMap.put(RESPONSE_ERROR, e.getMessage());
}
}
@Override
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
}
/**
* Duplicated code with AbstractAzkabanServlet, but ne
*/
public boolean hasParam(HttpServletRequest request, String param) {
return request.getParameter(param) != null;
}
public String getParam(HttpServletRequest request, String name)
throws ServletException {
String p = request.getParameter(name);
if (p == null)
throw new ServletException("Missing required parameter '" + name + "'.");
else
return p;
}
public String getParam(HttpServletRequest request, String name,
String defaultVal) {
String p = request.getParameter(name);
if (p == null) {
return defaultVal;
}
return p;
}
public int getIntParam(HttpServletRequest request, String name)
throws ServletException {
String p = getParam(request, name);
return Integer.parseInt(p);
}
public int getIntParam(HttpServletRequest request, String name, int defaultVal) {
if (hasParam(request, name)) {
try {
return getIntParam(request, name);
} catch (Exception e) {
return defaultVal;
}
}
return defaultVal;
}
}