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org.apache.oozie.servlet.JsonRestServlet Maven / Gradle / Ivy
/**
* Copyright (c) 2010 Yahoo! Inc. 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. See accompanying LICENSE file.
*/
package org.apache.oozie.servlet;
import org.apache.oozie.client.OozieClient.SYSTEM_MODE;
import org.apache.oozie.client.rest.JsonBean;
import org.apache.oozie.client.rest.RestConstants;
import org.apache.oozie.service.DagXLogInfoService;
import org.apache.oozie.service.InstrumentationService;
import org.apache.oozie.service.Services;
import org.apache.oozie.service.XLogService;
import org.apache.oozie.util.Instrumentation;
import org.apache.oozie.util.ParamChecker;
import org.apache.oozie.util.XLog;
import org.apache.oozie.ErrorCode;
import org.json.simple.JSONObject;
import org.json.simple.JSONStreamAware;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicLong;
/**
* Base class for Oozie web service API Servlets.
This class provides common instrumentation, error logging and
* other common functionality.
*/
public abstract class JsonRestServlet extends HttpServlet {
private static final String JSTON_UTF8 = RestConstants.JSON_CONTENT_TYPE + "; charset=\"UTF-8\"";
protected static final String XML_UTF8 = RestConstants.XML_CONTENT_TYPE + "; charset=\"UTF-8\"";
protected static final String TEXT_UTF8 = RestConstants.TEXT_CONTENT_TYPE + "; charset=\"UTF-8\"";
protected static final String AUDIT_OPERATION = "audit.operation";
protected static final String AUDIT_PARAM = "audit.param";
protected static final String AUDIT_ERROR_CODE = "audit.error.code";
protected static final String AUDIT_ERROR_MESSAGE = "audit.error.message";
protected static final String AUDIT_HTTP_STATUS_CODE = "audit.http.status.code";
private XLog auditLog;
XLog.Info logInfo;
/**
* This bean defines a query string parameter.
*/
public static class ParameterInfo {
private String name;
private Class type;
private List methods;
private boolean required;
/**
* Creates a ParameterInfo with querystring parameter definition.
*
* @param name querystring parameter name.
* @param type type for the parameter value, valid types are: Integer, Boolean and String
* @param required indicates if the parameter is required.
* @param methods HTTP methods the parameter is used by.
*/
public ParameterInfo(String name, Class type, boolean required, List methods) {
this.name = ParamChecker.notEmpty(name, "name");
if (type != Integer.class && type != Boolean.class && type != String.class) {
throw new IllegalArgumentException("Type must be integer, boolean or string");
}
this.type = ParamChecker.notNull(type, "type");
this.required = required;
this.methods = ParamChecker.notNull(methods, "methods");
}
}
/**
* This bean defines a REST resource.
*/
public static class ResourceInfo {
private String name;
private boolean wildcard;
private List methods;
private Map parameters = new HashMap();
/**
* Creates a ResourceInfo with a REST resource definition.
*
* @param name name of the REST resource, it can be an fixed resource name, empty or a wildcard ('*').
* @param methods HTTP methods supported by the resource.
* @param parameters parameters supported by the resource.
*/
public ResourceInfo(String name, List methods, List parameters) {
this.name = name;
wildcard = name.equals("*");
for (ParameterInfo parameter : parameters) {
this.parameters.put(parameter.name, parameter);
}
this.methods = ParamChecker.notNull(methods, "methods");
}
}
/**
* Name of the instrumentation group for the WS layer, value is 'webservices'.
*/
protected static final String INSTRUMENTATION_GROUP = "webservices";
private static final String INSTR_TOTAL_REQUESTS_SAMPLER = "requests";
private static final String INSTR_TOTAL_REQUESTS_COUNTER = "requests";
private static final String INSTR_TOTAL_FAILED_REQUESTS_COUNTER = "failed";
private static AtomicLong TOTAL_REQUESTS_SAMPLER_COUNTER;
private Instrumentation instrumentation;
private String instrumentationName;
private AtomicLong samplerCounter = new AtomicLong();
private ThreadLocal requestCron = new ThreadLocal();
private List resourcesInfo = new ArrayList();
private boolean allowSafeModeChanges;
/**
* Creates a servlet with a specified instrumentation sampler name for its requests.
*
* @param instrumentationName instrumentation name for timer and samplers for the servlet.
* @param resourcesInfo list of resource definitions supported by the servlet, empty and wildcard resources must be
* the last ones, in that order, first empty and the wildcard.
*/
public JsonRestServlet(String instrumentationName, ResourceInfo... resourcesInfo) {
this.instrumentationName = ParamChecker.notEmpty(instrumentationName, "instrumentationName");
if (resourcesInfo.length == 0) {
throw new IllegalArgumentException("There must be at least one ResourceInfo");
}
this.resourcesInfo = Arrays.asList(resourcesInfo);
auditLog = XLog.getLog("oozieaudit");
auditLog.setMsgPrefix("");
logInfo = new XLog.Info(XLog.Info.get());
}
/**
* Enable HTTP POST/PUT/DELETE methods while in safe mode.
*
* @param allow true enabled safe mode changes, false disable safe mode changes
* (default).
*/
protected void setAllowSafeModeChanges(boolean allow) {
allowSafeModeChanges = allow;
}
/**
* Define an instrumentation sampler.
Sampling period is 60 seconds, the sampling frequency is 1 second.
* The instrumentation group used is {@link #INSTRUMENTATION_GROUP}.
*
* @param samplerName sampler name.
* @param samplerCounter sampler counter.
*/
private void defineSampler(String samplerName, final AtomicLong samplerCounter) {
instrumentation.addSampler(INSTRUMENTATION_GROUP, samplerName, 60, 1, new Instrumentation.Variable() {
public Long getValue() {
return samplerCounter.get();
}
});
}
/**
* Add an instrumentation cron.
*
* @param name name of the timer for the cron.
* @param cron cron to add to a instrumentation timer.
*/
private void addCron(String name, Instrumentation.Cron cron) {
instrumentation.addCron(INSTRUMENTATION_GROUP, name, cron);
}
/**
* Start the request instrumentation cron.
*/
protected void startCron() {
requestCron.get().start();
}
/**
* Stop the request instrumentation cron.
*/
protected void stopCron() {
requestCron.get().stop();
}
/**
* Initializes total request and servlet request samplers.
*/
public void init(ServletConfig servletConfig) throws ServletException {
super.init(servletConfig);
instrumentation = Services.get().get(InstrumentationService.class).get();
synchronized (JsonRestServlet.class) {
if (TOTAL_REQUESTS_SAMPLER_COUNTER == null) {
TOTAL_REQUESTS_SAMPLER_COUNTER = new AtomicLong();
defineSampler(INSTR_TOTAL_REQUESTS_SAMPLER, TOTAL_REQUESTS_SAMPLER_COUNTER);
}
}
defineSampler(instrumentationName, samplerCounter);
}
/**
* Convenience method for instrumentation counters.
*
* @param name counter name.
* @param count count to increment the counter.
*/
private void incrCounter(String name, int count) {
if (instrumentation != null) {
instrumentation.incr(INSTRUMENTATION_GROUP, name, count);
}
}
/**
* Logs audit information for write requests to the audit log.
*
* @param request the http request.
*/
private void logAuditInfo(HttpServletRequest request) {
if (request.getAttribute(AUDIT_OPERATION) != null) {
Integer httpStatusCode = (Integer) request.getAttribute(AUDIT_HTTP_STATUS_CODE);
httpStatusCode = (httpStatusCode != null) ? httpStatusCode : HttpServletResponse.SC_OK;
String status = (httpStatusCode == HttpServletResponse.SC_OK) ? "SUCCESS" : "FAILED";
String operation = (String) request.getAttribute(AUDIT_OPERATION);
String param = (String) request.getAttribute(AUDIT_PARAM);
String user = XLog.Info.get().getParameter(XLogService.USER);
String group = XLog.Info.get().getParameter(XLogService.GROUP);
String jobId = XLog.Info.get().getParameter(DagXLogInfoService.JOB);
String app = XLog.Info.get().getParameter(DagXLogInfoService.APP);
String errorCode = (String) request.getAttribute(AUDIT_ERROR_CODE);
String errorMessage = (String) request.getAttribute(AUDIT_ERROR_MESSAGE);
auditLog
.info(
"USER [{0}], GROUP [{1}], APP [{2}], JOBID [{3}], OPERATION [{4}], PARAMETER [{5}], STATUS [{6}], HTTPCODE [{7}], ERRORCODE [{8}], ERRORMESSAGE [{9}]",
user, group, app, jobId, operation, param, status, httpStatusCode, errorCode, errorMessage);
}
}
/**
* Dispatches to super after loginfo and intrumentation handling. In case of errors dispatches error response codes
* and does error logging.
*/
@SuppressWarnings("unchecked")
protected final void service(HttpServletRequest request, HttpServletResponse response) throws ServletException,
IOException {
//if (Services.get().isSafeMode() && !request.getMethod().equals("GET") && !allowSafeModeChanges) {
if (Services.get().getSystemMode() != SYSTEM_MODE.NORMAL && !request.getMethod().equals("GET") && !allowSafeModeChanges) {
sendErrorResponse(response, HttpServletResponse.SC_SERVICE_UNAVAILABLE, ErrorCode.E0002.toString(),
ErrorCode.E0002.getTemplate());
return;
}
Instrumentation.Cron cron = new Instrumentation.Cron();
requestCron.set(cron);
try {
cron.start();
validateRestUrl(request.getMethod(), getResourceName(request), request.getParameterMap());
XLog.Info.get().clear();
String user = getUser(request);
XLog.Info.get().setParameter(XLogService.USER, user);
TOTAL_REQUESTS_SAMPLER_COUNTER.incrementAndGet();
samplerCounter.incrementAndGet();
super.service(request, response);
}
catch (XServletException ex) {
XLog log = XLog.getLog(getClass());
log.warn("URL[{0} {1}] error[{2}], {3}", request.getMethod(), getRequestUrl(request), ex.getErrorCode(), ex
.getMessage(), ex);
request.setAttribute(AUDIT_ERROR_MESSAGE, ex.getMessage());
request.setAttribute(AUDIT_ERROR_CODE, ex.getErrorCode().toString());
request.setAttribute(AUDIT_HTTP_STATUS_CODE, ex.getHttpStatusCode());
incrCounter(INSTR_TOTAL_FAILED_REQUESTS_COUNTER, 1);
sendErrorResponse(response, ex.getHttpStatusCode(), ex.getErrorCode().toString(), ex.getMessage());
}
catch (RuntimeException ex) {
XLog log = XLog.getLog(getClass());
log.error("URL[{0} {1}] error, {2}", request.getMethod(), getRequestUrl(request), ex.getMessage(), ex);
incrCounter(INSTR_TOTAL_FAILED_REQUESTS_COUNTER, 1);
throw ex;
}
finally {
logAuditInfo(request);
TOTAL_REQUESTS_SAMPLER_COUNTER.decrementAndGet();
incrCounter(INSTR_TOTAL_REQUESTS_COUNTER, 1);
samplerCounter.decrementAndGet();
XLog.Info.remove();
cron.stop();
// TODO
incrCounter(instrumentationName, 1);
incrCounter(instrumentationName + "-" + request.getMethod(), 1);
addCron(instrumentationName, cron);
addCron(instrumentationName + "-" + request.getMethod(), cron);
requestCron.remove();
}
}
private String getRequestUrl(HttpServletRequest request) {
StringBuffer url = request.getRequestURL();
if (request.getQueryString() != null) {
url.append("?").append(request.getQueryString());
}
return url.toString();
}
/**
* Sends a JSON response.
*
* @param response servlet response.
* @param statusCode HTTP status code.
* @param bean bean to send as JSON response.
* @throws java.io.IOException thrown if the bean could not be serialized to the response output stream.
*/
protected void sendJsonResponse(HttpServletResponse response, int statusCode, JsonBean bean) throws IOException {
response.setStatus(statusCode);
JSONObject json = bean.toJSONObject();
response.setContentType(JSTON_UTF8);
json.writeJSONString(response.getWriter());
}
/**
* Sends a error response.
*
* @param response servlet response.
* @param statusCode HTTP status code.
* @param error error code.
* @param message error message.
* @throws java.io.IOException thrown if the error response could not be set.
*/
protected void sendErrorResponse(HttpServletResponse response, int statusCode, String error, String message)
throws IOException {
response.setHeader(RestConstants.OOZIE_ERROR_CODE, error);
response.setHeader(RestConstants.OOZIE_ERROR_MESSAGE, message);
response.sendError(statusCode);
}
protected void sendJsonResponse(HttpServletResponse response, int statusCode, JSONStreamAware json)
throws IOException {
if (statusCode == HttpServletResponse.SC_OK || statusCode == HttpServletResponse.SC_CREATED) {
response.setStatus(statusCode);
}
else {
response.sendError(statusCode);
}
response.setStatus(statusCode);
response.setContentType(JSTON_UTF8);
json.writeJSONString(response.getWriter());
}
/**
* Validates REST URL using the ResourceInfos of the servlet.
*
* @param method HTTP method.
* @param resourceName resource name.
* @param queryStringParams query string parameters.
* @throws javax.servlet.ServletException thrown if the resource name or parameters are incorrect.
*/
@SuppressWarnings("unchecked")
protected void validateRestUrl(String method, String resourceName, Map queryStringParams)
throws ServletException {
if (resourceName.contains("/")) {
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0301, resourceName);
}
boolean valid = false;
for (int i = 0; !valid && i < resourcesInfo.size(); i++) {
ResourceInfo resourceInfo = resourcesInfo.get(i);
if (resourceInfo.name.equals(resourceName) || resourceInfo.wildcard) {
if (!resourceInfo.methods.contains(method)) {
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0301, resourceName);
}
for (Map.Entry entry : queryStringParams.entrySet()) {
String name = entry.getKey();
ParameterInfo parameterInfo = resourceInfo.parameters.get(name);
if (parameterInfo != null) {
if (!parameterInfo.methods.contains(method)) {
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0302, name);
}
String value = entry.getValue()[0].trim();
if (parameterInfo.type.equals(Boolean.class)) {
value = value.toLowerCase();
if (!value.equals("true") && !value.equals("false")) {
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0304, name,
"boolean");
}
}
if (parameterInfo.type.equals(Integer.class)) {
try {
Integer.parseInt(value);
}
catch (NumberFormatException ex) {
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0304, name,
"integer");
}
}
}
}
for (ParameterInfo parameterInfo : resourceInfo.parameters.values()) {
if (parameterInfo.methods.contains(method) && parameterInfo.required
&& queryStringParams.get(parameterInfo.name) == null) {
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0305,
parameterInfo.name);
}
}
valid = true;
}
}
if (!valid) {
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0301, resourceName);
}
}
/**
* Return the resource name of the request.
The resource name is the whole extra path. If the extra path starts
* with '/', the first '/' is trimmed.
*
* @param request request instance
* @return the resource name, null if none.
*/
protected String getResourceName(HttpServletRequest request) {
String requestPath = request.getPathInfo();
if (requestPath != null) {
while (requestPath.startsWith("/")) {
requestPath = requestPath.substring(1);
}
requestPath = requestPath.trim();
}
else {
requestPath = "";
}
return requestPath;
}
/**
* Return the request content type, lowercase and without attributes.
*
* @param request servlet request.
* @return the request content type, null if none.
*/
protected String getContentType(HttpServletRequest request) {
String contentType = request.getContentType();
if (contentType != null) {
int index = contentType.indexOf(";");
if (index > -1) {
contentType = contentType.substring(0, index);
}
contentType = contentType.toLowerCase();
}
return contentType;
}
/**
* Validate and return the content type of the request.
*
* @param request servlet request.
* @param expected expected contentType.
* @return the normalized content type (lowercase and without modifiers).
* @throws XServletException thrown if the content type is invalid.
*/
protected String validateContentType(HttpServletRequest request, String expected) throws XServletException {
String contentType = getContentType(request);
if (contentType == null || contentType.trim().length() == 0) {
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0300, contentType);
}
if (!contentType.equals(expected)) {
throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0300, contentType);
}
return contentType;
}
/**
* Request attribute constant for the authenticatio token.
*/
public static final String AUTH_TOKEN = "oozie.auth.token";
/**
* Request attribute constant for the user name.
*/
public static final String USER_NAME = "oozie.user.name";
protected static final String UNDEF = "?";
/**
* Return the authentication token of the request if any.
*
* @param request request.
* @return the authentication token, null if there is none.
*/
protected String getAuthToken(HttpServletRequest request) {
String authToken = (String) request.getAttribute(AUTH_TOKEN);
return (authToken != null) ? authToken : UNDEF;
}
/**
* Return the user name of the request if any.
*
* @param request request.
* @return the user name, null if there is none.
*/
protected String getUser(HttpServletRequest request) {
String userName = (String) request.getAttribute(USER_NAME);
return (userName != null) ? userName : UNDEF;
}
/**
* Set the log info with the given information.
*
* @param jobid job ID.
* @param actionid action ID.
*/
protected void setLogInfo(String jobid, String actionid) {
logInfo.setParameter(DagXLogInfoService.JOB, jobid);
logInfo.setParameter(DagXLogInfoService.ACTION, actionid);
XLog.Info.get().setParameters(logInfo);
}
}
