Node.js Tutorial


Introduction

All Apache Thrift tutorials require that you have:

  1. Built and installed the Apache Thrift Compiler and Libraries, see Building from source for more details.
  2. Generated the tutorial.thrift and shared.thrift files as discussed here.

    thrift -r --gen js:node tutorial.thrift
    
  3. Followed all prerequisites listed below.

Prerequisites

Client

var thrift = require('thrift');
var Calculator = require('./gen-nodejs/Calculator');
var ttypes = require('./gen-nodejs/tutorial_types');

var transport = thrift.TBufferedTransport;
var protocol = thrift.TBinaryProtocol;

var connection = thrift.createConnection("localhost", 9090, {
  transport : transport,
  protocol : protocol
});

connection.on('error', function(err) {
  assert(false, err);
});

// Create a Calculator client with the connection
var client = thrift.createClient(Calculator, connection);


client.ping(function(err, response) {
  console.log('ping()');
});


client.add(1,1, function(err, response) {
  console.log("1+1=" + response);
});


work = new ttypes.Work();
work.op = ttypes.Operation.DIVIDE;
work.num1 = 1;
work.num2 = 0;

client.calculate(1, work, function(err, message) {
  if (err) {
    console.log("InvalidOperation " + err);
  } else {
    console.log('Whoa? You know how to divide by zero?');
  }
});

work.op = ttypes.Operation.SUBTRACT;
work.num1 = 15;
work.num2 = 10;

client.calculate(1, work, function(err, message) {
  console.log('15-10=' + message);

  client.getStruct(1, function(err, message){
    console.log('Check log: ' + message.value);

    //close the connection once we're done
    connection.end();
  });
});

Server

var thrift = require("thrift");
var Calculator = require("./gen-nodejs/Calculator");
var ttypes = require("./gen-nodejs/tutorial_types");
var SharedStruct = require("./gen-nodejs/shared_types").SharedStruct;

var data = {};

var server = thrift.createServer(Calculator, {
  ping: function(result) {
    console.log("ping()");
    result(null);
  },

  add: function(n1, n2, result) {
    console.log("add(", n1, ",", n2, ")");
    result(null, n1 + n2);
  },

  calculate: function(logid, work, result) {
    console.log("calculate(", logid, ",", work, ")");

    var val = 0;
    if (work.op == ttypes.Operation.ADD) {
      val = work.num1 + work.num2;
    } else if (work.op === ttypes.Operation.SUBTRACT) {
      val = work.num1 - work.num2;
    } else if (work.op === ttypes.Operation.MULTIPLY) {
      val = work.num1 * work.num2;
    } else if (work.op === ttypes.Operation.DIVIDE) {
      if (work.num2 === 0) {
        var x = new ttypes.InvalidOperation();
        x.whatOp = work.op;
        x.why = 'Cannot divide by 0';
        result(x);
        return;
      }
      val = work.num1 / work.num2;
    } else {
      var x = new ttypes.InvalidOperation();
      x.whatOp = work.op;
      x.why = 'Invalid operation';
      result(x);
      return;
    }

    var entry = new SharedStruct();
    entry.key = logid;
    entry.value = ""+val;
    data[logid] = entry;

    result(null, val);
  },

  getStruct: function(key, result) {
    console.log("getStruct(", key, ")");
    result(null, data[key]);
  },

  zip: function() {
    console.log("zip()");
    result(null);
  }

});

server.listen(9090);

Additional Information