THttpClient.as

/*
 * 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.thrift.transport {

  import flash.errors.EOFError;
  import flash.events.Event;
  import flash.events.IOErrorEvent;
  import flash.events.SecurityErrorEvent;
  import flash.net.URLLoader;
  import flash.net.URLLoaderDataFormat;
  import flash.net.URLRequest;
  import flash.net.URLRequestMethod;
  import flash.system.Capabilities;
  import flash.utils.ByteArray;
  
  /**
   * HTTP implementation of the TTransport interface. Used for working with a
   * Thrift web services implementation.
   */
  public class THttpClient extends TTransport {

    private var request_:URLRequest = null;
    private var requestBuffer_:ByteArray = new ByteArray();
    private var responseBuffer_:ByteArray = null;
    private var traceBuffers_:Boolean = Capabilities.isDebugger;

    
    public function getBuffer():ByteArray {
      return requestBuffer_;
    }
    
    public function THttpClient(request:URLRequest, traceBuffers:Boolean=true):void {
      request.contentType = "application/x-thrift";
      request_ = request;
      if(traceBuffers == false) {
        traceBuffers_ = traceBuffers;
      }
    }
    
    public override function open():void {
    }

    public override function close():void {
    }
 
    public override function isOpen():Boolean {
      return true;
    }
    
    public override function read(buf:ByteArray, off:int, len:int):int {
      if (responseBuffer_ == null) {
        throw new TTransportError(TTransportError.UNKNOWN, "Response buffer is empty, no request.");
      }
        try {
            responseBuffer_.readBytes(buf, off, len);
            if (traceBuffers_) {
              dumpBuffer(buf, "READ");
            }
            return len;
          }
          catch (e:EOFError) {
            if (traceBuffers_) {
              dumpBuffer(requestBuffer_, "FAILED-RESPONSE-REQUEST");
              dumpBuffer(responseBuffer_, "FAILED-RESPONSE");
            }
            throw new TTransportError(TTransportError.UNKNOWN, "No more data available.");
        }
        return 0;
    }

    public override function write(buf:ByteArray, off:int, len:int):void {
      requestBuffer_.writeBytes(buf, off, len);
    }

    public override function flush(callback:Function=null):void {
      var loader:URLLoader = new URLLoader();
      if (callback != null) {
        loader.addEventListener(Event.COMPLETE, function(event:Event):void {
         responseBuffer_ = URLLoader(event.target).data;
         if (traceBuffers_) {
           dumpBuffer(responseBuffer_, "RESPONSE_BUFFER");
         }
         callback(null);
         responseBuffer_ = null;
        });
        loader.addEventListener(IOErrorEvent.IO_ERROR, function(event:IOErrorEvent):void {
          callback(new TTransportError(TTransportError.UNKNOWN, "IOError: " + event.text));
          responseBuffer_ = null;
        });
        loader.addEventListener(SecurityErrorEvent.SECURITY_ERROR, function(event:SecurityErrorEvent):void {
          callback(new TTransportError(TTransportError.UNKNOWN, "SecurityError: " + event.text));
          responseBuffer_ = null;
        });
      }
      request_.method = URLRequestMethod.POST;
      loader.dataFormat = URLLoaderDataFormat.BINARY;
      requestBuffer_.position = 0;
      request_.data = requestBuffer_;
      loader.load(request_);
    }

    private function dumpBuffer(buf:ByteArray, prefix:String):String {
      var debugString : String = prefix + " BUFFER ";
      if (buf != null) {
        debugString += "length: " + buf.length + ", ";
        for (var i : int = 0; i < buf.length; i++) {
          debugString += "[" + buf[i].toString(16) + "]";
        }
      } else {
        debugString = "null";
      }
      trace(debugString);
      return debugString;
    }

  }
}