/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.flink.client.web;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.flink.client.program.PackagedProgram;
public class PactJobJSONServlet extends HttpServlet {
/** Serial UID for serialization interoperability. */
private static final long serialVersionUID = 558077298726449201L;
private static final Logger LOG = LoggerFactory.getLogger(PactJobJSONServlet.class);
// ------------------------------------------------------------------------
private static final String JOB_PARAM_NAME = "job";
// ------------------------------------------------------------------------
private final File jobStoreDirectory; // the directory in which the jobs are stored
public PactJobJSONServlet(File jobStoreDirectory) {
this.jobStoreDirectory = jobStoreDirectory;
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setContentType("application/json");
String jobName = req.getParameter(JOB_PARAM_NAME);
if (jobName == null) {
LOG.warn("Received request without job parameter name.");
resp.setStatus(HttpServletResponse.SC_BAD_REQUEST);
return;
}
// check, if the jar exists
File jarFile = new File(jobStoreDirectory, jobName);
if (!jarFile.exists()) {
LOG.warn("Received request for non-existing jar file.");
resp.setStatus(HttpServletResponse.SC_BAD_REQUEST);
return;
}
// create the pact plan
PackagedProgram pactProgram;
try {
pactProgram = new PackagedProgram(jarFile, new String[0]);
}
catch (Throwable t) {
LOG.info("Instantiating the PactProgram for '" + jarFile.getName() + "' failed.", t);
resp.setStatus(HttpServletResponse.SC_BAD_REQUEST);
resp.getWriter().print(t.getMessage());
return;
}
String jsonPlan = null;
String programDescription = null;
try {
jsonPlan = pactProgram.getPreviewPlan();
}
catch (Throwable t) {
LOG.error("Failed to create json dump of pact program.", t);
}
try {
programDescription = pactProgram.getDescription();
}
catch (Throwable t) {
LOG.error("Failed to create description of pact program.", t);
}
if (jsonPlan == null && programDescription == null) {
resp.setStatus(HttpServletResponse.SC_BAD_REQUEST);
return;
} else {
resp.setStatus(HttpServletResponse.SC_OK);
PrintWriter wrt = resp.getWriter();
wrt.print("{ \"jobname\": \"");
wrt.print(jobName);
if (jsonPlan != null) {
wrt.print("\", \"plan\": ");
wrt.println(jsonPlan);
}
if (programDescription != null) {
wrt.print(", \"description\": \"");
wrt.print(escapeString(programDescription));
wrt.print("\"");
}
wrt.println("}");
}
}
protected String escapeString(String str) {
int len = str.length();
char[] s = str.toCharArray();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < len; i += 1) {
char c = s[i];
if ((c == '\\') || (c == '"') || (c == '/')) {
sb.append('\\');
sb.append(c);
}
else if (c == '\b') {
sb.append("\\b");
} else if (c == '\t') {
sb.append("\\t");
} else if (c == '\n') {
sb.append("<br>");
} else if (c == '\f') {
sb.append("\\f");
} else if (c == '\r') {
sb.append("\\r");
} else if (c == '>') {
sb.append(">");
} else if (c == '<') {
sb.append("<");
} else {
if (c < ' ') {
// Unreadable throw away
} else {
sb.append(c);
}
}
}
return sb.toString();
}
}