Thrift is a software framework for scalable cross-language services development. Thrift allows you to define data types and service interfaces in a simple definition file. Taking that file as input, the compiler generates code to be used to easily build RPC clients and servers that communicate seamlessly across programming languages.
This post provides a step by step guide to install thrift and write a server (in java) and a client (in php) using it.
1. Download Thrift
Basic requirements
Please go through this link for a list of prerequisite or basic requirements for thrift compiler.
Download the latest stable release of from here and extract it. OR do a svn checkout
$ svn co http://svn.apache.org/repos/asf/thrift/trunk thrift
2. Build and Install
Now go to the thrift directory and run
$ ./bootstrap.sh
$ ./configure
$ make
$ make install
this will install thrift on your system.
3. Writing a Thrift file
Next step is to write a thrift definition or .thrift file. This file describes the data structures, and functions available to your remote service. For this post I am going to write a simple service for getting a user profile.
profileservice.thrift
namespace php ProfileService #client
namespace java test.services.profile.thrift #server
enum JobType {
P, //Permanent
T //Temporary
}
enum EmploymentStatus {
F, //Full Time
P, //Part Time
}
exception ProfileServiceException {
1: i32 code,
2: string message
}
struct Profile {
1: i32 profileId,
2: string name,
3: string birthDate,
4: string contactAddress,
5: i32 cityId,
6: double totalExperience,
7: JobType jobType,
8: EmploymentStatus employmentStatus,
9: string summary,
}
service ProfileService {
Profile getProfileById(1:i32 profileId) throws (1: ProfileServiceException e),
Profile getProfileByName(1:string name) throws (1: ProfileServiceException e),
}
4. Using the Thrift Compiler
Now its time to generate the thrift code for server and client. For java server run the command
thrift --gen java profileservice.thrift
After you run the thrift generation for java, it’ll make a directory called gen-java/. Under this, you can find relevant files and classes to do work based on your Thrift definition. For my thrift its generated the following files under the directory gen-java/test/services/profile/thrift/ (its based on package name or namespace provided in the .thrift file)
$ ls gen-java/test/services/profile/thrift/
EmploymentStatus.java
JobType.java
Profile.java
ProfileServiceException.java
ProfileService.java
For php client run
thrift --gen php profileservice.thrift
for php, it’ll make a directory called gen-php/. For my thrift its generated the following files under the directory gen-php/profileservice/ (its based on package name or namespace provided in the .thrift file)
$ ls gen-php/profileservice/
ProfileService.php
profileservice_types.php
5. Creating a Thrift Server using Java
The next step is to create a java source file for implementing the interface (functions that we had defined in the profileservice.thrift file). The name of the interface is our case is ProfileService.Iface. We named the java class that implemented this interface in our case "ProfileServiceImpl". You will also need thrift java library for this. You can get lib/java/libthrift.jar file from your thrift source directory.
ProfileServiceImpl.java
package server;
import java.util.*;
import org.apache.thrift.*;
import test.services.profile.thrift.*;
class ProfileServiceImpl implements ProfileService.Iface
{
public Profile getProfileById(int profileId) throws ProfileServiceException, TException {
// your code goes here
return profile;
}
public Profile getProfileByName(String name) throws ProfileServiceException, TException {
// your code goes here
return profile;
}
}
Now write a java server for this service.
Server.java
package server;
import java.io.*;
import org.apache.thrift.protocol.*;
import org.apache.thrift.protocol.TBinaryProtocol.*;
import org.apache.thrift.server.*;
import org.apache.thrift.transport.*;
import test.services.profile.thrift.*;
public class Server
{
private void start()
{
try
{
TServerSocket serverTransport = new TServerSocket(7911);
ProfileService.Processor processor = new ProfileService.Processor(new ProfileServiceImpl());
Factory protFactory = new TBinaryProtocol.Factory(true, true);
TServer server = new TThreadPoolServer(processor, serverTransport, protFactory);
System.out.println("Starting server on port 7911 ...");
server.serve();
}catch(TTransportException e)
{
e.printStackTrace();
}
}
public static void main(String[] args)
{
Server srv = new Server();
srv.start();
}
}
This program simply has a main function which binds the service to a particular port and makes the server ready to accept connections and provide response. This code will generally remain constant unless you want to provide additional functionality at server level.
Compile all the files and start the server.
6. Creating a Thrift Client using PHP
Now its time to write a thrift client in php to use this service. You'll need to include the language specific libraries to facilitate access to thrift. Look for the folder ./lib/php/src/ in your thrift source directory which contains the library files you will need.
For this tutorial I have created a folder testclient in my home directory. Now create a subfoder named src-php, and copy all the library files in this folder. You will also need to mv or cp the autogenerated thrift files (from gen-php folder) for this project into the packages folder of these library files. Here’s a screenshot of my directorys structure for this project.
For this tutorial I have created a folder testclient in my home directory. Now create a subfoder named src-php, and copy all the library files in this folder. You will also need to mv or cp the autogenerated thrift files (from gen-php folder) for this project into the packages folder of these library files. Here’s a screenshot of my directorys structure for this project.
testclient
..src-php
....autoload.php
....ext
....packages
......profileservice
........ProfileService.php
........profileservice_types.php
....protocol
....server
....Thrift.php
....transport
Write a php client script to connect to the thrfit ProfileService server
ProfileServiceClient.php
// Setup the path to the thrift library folder
$GLOBALS['THRIFT_ROOT'] = 'thrift';
// Load up all the thrift stuff
require_once $GLOBALS['THRIFT_ROOT'].'/Thrift.php';
require_once $GLOBALS['THRIFT_ROOT'].'/protocol/TBinaryProtocol.php';
require_once $GLOBALS['THRIFT_ROOT'].'/transport/TSocket.php';
require_once $GLOBALS['THRIFT_ROOT'].'/transport/TBufferedTransport.php';
// Load the package that we autogenerated for this tutorial
require_once $GLOBALS['THRIFT_ROOT'].'/packages/profileservice/ProfileService.php';
try {
// Create a thrift connection
$socket = new TSocket('localhost', '9090');
$transport = new TBufferedTransport($socket);
$protocol = new TBinaryProtocol($transport);
// Create a profile service client
$client = new ProfileServiceClient($protocol);
// Open up the connection
$transport->open();
$data = $this->client->getProfileById(123);
$this->transport->close();
$this->socket->close();
print_r($data);
}
catch (TException $tx) {
// a general thrift exception
echo "ThriftException: ".$tx->getMessage()."\r\n";
}
?>
to run the client execute
php ProfileServiceClient.php
