I am having some trouble communicating between my javascript client and java server using Apache Thrift.
These answers does not get me much further. What I would like to know is how to change the tutorial java server in a way that makes it possible to communicate with a javascript client?
What I get from these answers is that I need to make the server communicate using the TJSONProtocol. I have done so with the following code
TServer server = new TSimpleServer(new Args(serverTransport).processor(processor).protocolFactory(new TJSONProtocol.Factory()));
Server code
import org.apache.thrift.server.TServer;
import org.apache.thrift.server.TServer.Args;
import org.apache.thrift.server.TSimpleServer;
import org.apache.thrift.server.TThreadPoolServer;
import org.apache.thrift.transport.TSSLTransportFactory;
import org.apache.thrift.transport.TServerSocket;
import org.apache.thrift.transport.TServerTransport;
import
org.apache.thrift.transport.TSSLTransportFactory.TSSLTransportParameters;
// Generated code
import tutorial.*;
import shared.*;
import java.util.HashMap;
public class JavaServer {
public static CalculatorHandler handler;
public static int port = 9092;
public static Calculator.Processor processor;
public static void main(String [] args) {
try {
handler = new CalculatorHandler();
processor = new Calculator.Processor(handler);
Runnable simple = new Runnable() {
public void run() {
simple(processor);
}
};
Runnable secure = new Runnable() {
public void run() {
secure(processor);
}
};
new Thread(simple).start();
new Thread(secure).start();
} catch (Exception x) {
x.printStackTrace();
}
}
public static void simple(Calculator.Processor processor) {
try {
TServerTransport serverTransport = new TServerSocket(port);
TServer server = new TSimpleServer(new Args(serverTransport).processor(processor).protocolFactory(new TSimpleJSONProtocol.Factory()));
// Use this for a multithreaded server
// TServer server = new TThreadPoolServer(new TThreadPoolServer.Args(serverTransport).processor(processor));
System.out.println("Starting the simple server...");
server.serve();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void secure(Calculator.Processor processor) {
try {
/*
* Use TSSLTransportParameters to setup the required SSL parameters. In this example
* we are setting the keystore and the keystore password. Other things like algorithms,
* cipher suites, client auth etc can be set.
*/
TSSLTransportParameters params = new TSSLTransportParameters();
// The Keystore contains the private key
params.setKeyStore("lib/java/test/.keystore", "thrift", null, null);
/*
* Use any of the TSSLTransportFactory to get a server transport with the appropriate
* SSL configuration. You can use the default settings if properties are set in the command line.
* Ex: -Djavax.net.ssl.keyStore=.keystore and -Djavax.net.ssl.keyStorePassword=thrift
*
* Note: You need not explicitly call open(). The underlying server socket is bound on return
* from the factory class.
*/
TServerTransport serverTransport = TSSLTransportFactory.getServerSocket(9091, 0, null, params);
TServer server = new TSimpleServer(new Args(serverTransport).processor(processor));
// Use this for a multi threaded server
// TServer server = new TThreadPoolServer(new TThreadPoolServer.Args(serverTransport).processor(processor));
System.out.println("Starting the secure server...");
server.serve();
} catch (Exception e) {
e.printStackTrace();
}
}
}
Client code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Hello Thrift</title>
</head>
<body>
Name: <input type="text" id="name_in">
<input type="button" id="get_msg" value="Get Message" >
<div id="output"></div>
<script src="thrift.js"></script>
<script src="gen-js/SharedService.js"></script>
<script src="gen-js/shared_types.js"></script>
<script src="gen-js/tutorial_types.js"></script>
<script src="gen-js/Calculator.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script>
function calc() {
var transport = new Thrift.Transport("http://localhost:9092");
var protocol = new Thrift.TJSONProtocol(transport);
var client = new CalculatorClient(protocol);
var nameElement = document.getElementById("name_in");
var outputElement = document.getElementById("output");
document.getElementById("get_msg")
.addEventListener("click", function(){
var work = new Work()
work.num1 = $("#num1").val();
work.num2 = $("#num2").val();
work.op = $("#op").val();
result = client.calculate(1, work);
outputElement.innerHTML = result;
});
};
calc();
</script>
</body>
</html>
When I run the client against the simple server it hangs. When I run against the secure server I get the following error:
Uncaught SyntaxError: Unexpected token in JSON at position 0
at JSON.parse (<anonymous>)
at Thrift.TJSONProtocol.Thrift.Protocol.readMessageBegin (http://localhost:8080/Thrift_1/tutorial1/thrift.js:1029:30)
I get the same error when running a java client from the tutorial against the secure server but works fine when communicating with the simple server.
