Diff: LPC1768/services/http/client/HTTPClient.h

Revision:

0:e083abcfe7a8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LPC1768/services/http/client/HTTPClient.h	Wed Jun 22 01:31:47 2011 +0000
@@ -0,0 +1,306 @@
+
+/*
+Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)
+ 
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+ 
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+ 
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+/** \file
+HTTP Client header file
+*/
+
+#ifndef HTTP_CLIENT_H
+#define HTTP_CLIENT_H
+
+class HTTPData;
+
+#include "core/net.h"
+#include "api/TCPSocket.h"
+#include "api/DNSRequest.h"
+#include "HTTPData.h"
+#include "mbed.h"
+
+#include <string>
+using std::string;
+
+#include <map>
+using std::map;
+
+///HTTP client results
+enum HTTPResult
+{
+  HTTP_OK, ///<Success
+  HTTP_PROCESSING, ///<Processing
+  HTTP_PARSE, ///<URI Parse error
+  HTTP_DNS, ///<Could not resolve name
+  HTTP_PRTCL, ///<Protocol error
+  HTTP_NOTFOUND, ///<HTTP 404 Error
+  HTTP_REFUSED, ///<HTTP 403 Error
+  HTTP_ERROR, ///<HTTP xxx error
+  HTTP_TIMEOUT, ///<Connection timeout
+  HTTP_CONN ///<Connection error
+};
+
+#include "core/netservice.h"
+
+///A simple HTTP Client
+/**
+The HTTPClient is composed of:
+- The actual client (HTTPClient)
+- Classes that act as a data repository, each of which deriving from the HTTPData class (HTTPText for short text content, HTTPFile for file I/O, HTTPMap for key/value pairs, and HTTPStream for streaming purposes)
+*/
+class HTTPClient : protected NetService
+{
+public:
+  ///Instantiates the HTTP client
+  HTTPClient();
+  virtual ~HTTPClient();
+  
+  ///Provides a basic authentification feature (Base64 encoded username and password)
+  void basicAuth(const char* user, const char* password); //Basic Authentification
+  
+  //High Level setup functions
+  ///Executes a GET Request (blocking)
+  /**
+  Executes a GET request on the URI uri
+  @param uri : URI on which to execute the request
+  @param pDataIn : pointer to an HTTPData instance that will collect the data returned by the request, can be NULL
+  Blocks until completion
+  */
+  HTTPResult get(const char* uri, HTTPData* pDataIn); //Blocking
+  
+  ///Executes a GET Request (non blocking)
+  /**
+  Executes a GET request on the URI uri
+  @param uri : URI on which to execute the request
+  @param pDataIn : pointer to an HTTPData instance that will collect the data returned by the request, can be NULL
+  @param pMethod : callback function
+  The function returns immediately and calls the callback on completion or error
+  */
+  HTTPResult get(const char* uri, HTTPData* pDataIn, void (*pMethod)(HTTPResult)); //Non blocking
+  
+  ///Executes a GET Request (non blocking)
+  /**
+  Executes a GET request on the URI uri
+  @param uri : URI on which to execute the request
+  @param pDataIn : pointer to an HTTPData instance that will collect the data returned by the request, can be NULL
+  @param pItem : instance of class on which to execute the callback method
+  @param pMethod : callback method
+  The function returns immediately and calls the callback on completion or error
+  */
+  template<class T> 
+  HTTPResult get(const char* uri, HTTPData* pDataIn, T* pItem, void (T::*pMethod)(HTTPResult)) //Non blocking
+  {
+    setOnResult(pItem, pMethod);
+    doGet(uri, pDataIn);
+    return HTTP_PROCESSING;
+  }
+  
+  ///Executes a POST Request (blocking)
+  /**
+  Executes a POST request on the URI uri
+  @param uri : URI on which to execute the request
+  @param dataOut : a HTTPData instance that contains the data that will be posted
+  @param pDataIn : pointer to an HTTPData instance that will collect the data returned by the request, can be NULL
+  Blocks until completion
+  */
+  HTTPResult post(const char* uri, const HTTPData& dataOut, HTTPData* pDataIn); //Blocking
+  
+  ///Executes a POST Request (non blocking)
+  /**
+  Executes a POST request on the URI uri
+  @param uri : URI on which to execute the request
+  @param dataOut : a HTTPData instance that contains the data that will be posted
+  @param pDataIn : pointer to an HTTPData instance that will collect the data returned by the request, can be NULL
+  @param pMethod : callback function
+  The function returns immediately and calls the callback on completion or error
+  */
+  HTTPResult post(const char* uri, const HTTPData& dataOut, HTTPData* pDataIn, void (*pMethod)(HTTPResult)); //Non blocking
+  
+  ///Executes a POST Request (non blocking)
+  /**
+  Executes a POST request on the URI uri
+  @param uri : URI on which to execute the request
+  @param dataOut : a HTTPData instance that contains the data that will be posted
+  @param pDataIn : pointer to an HTTPData instance that will collect the data returned by the request, can be NULL
+  @param pItem : instance of class on which to execute the callback method
+  @param pMethod : callback method
+  The function returns immediately and calls the callback on completion or error
+  */
+  template<class T> 
+  HTTPResult post(const char* uri, const HTTPData& dataOut, HTTPData* pDataIn, T* pItem, void (T::*pMethod)(HTTPResult)) //Non blocking  
+  {
+    setOnResult(pItem, pMethod);
+    doPost(uri, dataOut, pDataIn);
+    return HTTP_PROCESSING;
+  }
+
+  ///Executes a GET Request (non blocking)
+  /**
+  Executes a GET request on the URI uri
+  @param uri : URI on which to execute the request
+  @param pDataIn : pointer to an HTTPData instance that will collect the data returned by the request, can be NULL
+  The function returns immediately and calls the previously set callback on completion or error
+  */  
+  void doGet(const char* uri, HTTPData* pDataIn);  
+  
+  ///Executes a POST Request (non blocking)
+  /**
+  Executes a POST request on the URI uri
+  @param uri : URI on which to execute the request
+  @param dataOut : a HTTPData instance that contains the data that will be posted
+  @param pDataIn : pointer to an HTTPData instance that will collect the data returned by the request, can be NULL
+  @param pMethod : callback function
+  The function returns immediately and calls the previously set callback on completion or error
+  */
+  void doPost(const char* uri, const HTTPData& dataOut, HTTPData* pDataIn); 
+  
+  ///Setups the result callback
+  /**
+  @param pMethod : callback function
+  */
+  void setOnResult( void (*pMethod)(HTTPResult) );
+  
+  ///Setups the result callback
+  /**
+  @param pItem : instance of class on which to execute the callback method
+  @param pMethod : callback method
+  */
+  class CDummy;
+  template<class T> 
+  void setOnResult( T* pItem, void (T::*pMethod)(HTTPResult) )
+  {
+    m_pCb = NULL;
+    m_pCbItem = (CDummy*) pItem;
+    m_pCbMeth = (void (CDummy::*)(HTTPResult)) pMethod;
+  }
+
+  ///Setups timeout
+  /**
+  @param ms : time of connection inactivity in ms after which the request should timeout
+  */
+  void setTimeout(int ms);
+  
+  virtual void poll(); //Called by NetServices
+  
+  ///Gets last request's HTTP response code
+  /**
+  @return The HTTP response code of the last request
+  */
+  int getHTTPResponseCode();
+  
+  ///Sets a specific request header
+  void setRequestHeader(const string& header, const string& value);
+  
+  ///Gets a response header
+  string& getResponseHeader(const string& header);
+  
+  ///Clears request headers
+  void resetRequestHeaders();
+  
+protected:
+  void resetTimeout();
+  
+  void init();
+  void close();
+  
+  void setup(const char* uri, HTTPData* pDataOut, HTTPData* pDataIn); //Setup request, make DNS Req if necessary
+  void connect(); //Start Connection
+  
+  int  tryRead(); //Read data and try to feed output
+  void readData(); //Data has been read
+  void writeData(); //Data has been written & buf is free
+  
+  void onTCPSocketEvent(TCPSocketEvent e);
+  void onDNSReply(DNSReply r);
+  void onResult(HTTPResult r); //Called when exchange completed or on failure
+  void onTimeout(); //Connection has timed out
+  
+private:
+  HTTPResult blockingProcess(); //Called in blocking mode, calls Net::poll() until return code is available
+
+  bool readHeaders(); //Called first when receiving data
+  bool writeHeaders(); //Called to create req
+  int readLine(char* str, int maxLen, bool* pIncomplete = NULL);
+  
+  enum HTTP_METH
+  {
+    HTTP_GET,
+    HTTP_POST,
+    HTTP_HEAD
+  };
+  
+  HTTP_METH m_meth;
+  
+  CDummy* m_pCbItem;
+  void (CDummy::*m_pCbMeth)(HTTPResult);
+  
+  void (*m_pCb)(HTTPResult);
+  
+  TCPSocket* m_pTCPSocket;
+  map<string, string> m_reqHeaders;
+  map<string, string> m_respHeaders;
+  
+  Timer m_watchdog;
+  int m_timeout;
+  
+  DNSRequest* m_pDnsReq;
+  
+  Host m_server;
+  string m_path;
+  
+  bool m_closed;
+  
+  enum HTTPStep
+  {
+   // HTTP_INIT,
+    HTTP_WRITE_HEADERS,
+    HTTP_WRITE_DATA,
+    HTTP_READ_HEADERS,
+    HTTP_READ_DATA,
+    HTTP_READ_DATA_INCOMPLETE,
+    HTTP_DONE,
+    HTTP_CLOSED
+  };
+  
+  HTTPStep m_state;
+  
+  HTTPData* m_pDataOut;
+  HTTPData* m_pDataIn;
+  
+  bool m_dataChunked; //Data is encoded as chunks
+  int m_dataPos; //Position in data
+  int m_dataLen; //Data length
+  char* m_buf;
+  char* m_pBufRemaining; //Remaining
+  int m_bufRemainingLen; //Data length in m_pBufRemaining
+  
+  int m_httpResponseCode;
+  
+  HTTPResult m_blockingResult; //Result if blocking mode
+  
+};
+
+//Including data containers here for more convenience
+#include "data/HTTPFile.h"
+#include "data/HTTPStream.h"
+#include "data/HTTPText.h"
+#include "data/HTTPMap.h"
+
+#endif