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Clean up HTTP webserver code in the Webserver project, so that it follows the uIP application structure guidelines and uses cleaner state machine based code.

Browse Source
pull/1469/head
Dean Camera 15 years ago
parent 331e8dece6
commit bb1a036f09
5 changed files with 189 additions and 139 deletions
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4
Projects/Webserver/Lib/DHCPApp.c
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@ -86,7 +86,7 @@ void DHCPApp_Callback(void)
RequiredOptionList);
/* Send the DHCP DISCOVER packet */
uip_send(AppData, AppDataSize);
uip_udp_send(AppDataSize);
/* Reset the timeout timer, progress to next state */
timer_reset(&DHCPTimer);
@ -132,7 +132,7 @@ void DHCPApp_Callback(void)
&AppState->DHCPOffer_Data.ServerIP);
/* Send the DHCP REQUEST packet */
uip_send(AppData, AppDataSize);
uip_udp_send(AppDataSize);
/* Reset the timeout timer, progress to next state */
timer_reset(&DHCPTimer);

181
Projects/Webserver/Lib/HTTPServerApp.c
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@ -34,6 +34,7 @@
* this will serve out files to HTTP clients.
*/
#define INCLUDE_FROM_HTTPSERVERAPP_C
#include "HTTPServerApp.h"
/** HTTP server response header, for transmission before the page contents. This indicates to the host that a page exists at the
@ -93,49 +94,84 @@ void WebserverApp_Init(void)
void WebserverApp_Callback(void)
{
uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
char* AppData = (char*)uip_appdata;
uint16_t AppDataSize = 0;
if (uip_aborted() || uip_timedout() || uip_closed())
{
/* Check if the open file needs to be closed */
/* Connection is being terminated for some reason - close file handle if open */
if (AppState->FileOpen)
{
f_close(&AppState->FileHandle);
AppState->FileOpen = false;
}
AppState->PrevState = WEBSERVER_STATE_Closed;
/* Lock to the closed state so that no further processing will occur on the connection */
AppState->CurrentState = WEBSERVER_STATE_Closed;
return;
AppState->NextState = WEBSERVER_STATE_Closed;
}
else if (uip_connected())
if (uip_connected())
{
/* New connection - initialize connection state values */
AppState->PrevState = WEBSERVER_STATE_OpenRequestedFile;
AppState->CurrentState = WEBSERVER_STATE_OpenRequestedFile;
AppState->NextState = WEBSERVER_STATE_OpenRequestedFile;
AppState->FileOpen = false;
AppState->ACKedFilePos = 0;
AppState->SentChunkSize = 0;
}
else if (uip_rexmit())
if (uip_acked())
{
/* Re-try last state */
AppState->CurrentState = AppState->PrevState;
/* Add the amount of ACKed file data to the total sent file bytes counter */
AppState->ACKedFilePos += AppState->SentChunkSize;
/* Progress to the next state once the current state's data has been ACKed */
AppState->CurrentState = AppState->NextState;
}
if (uip_rexmit() || uip_newdata() || uip_acked() || uip_connected() || uip_poll())
{
switch (AppState->CurrentState)
{
case WEBSERVER_STATE_OpenRequestedFile:
/* Wait for the packet containing the request header */
if (uip_newdata())
{
Webserver_OpenRequestedFile();
break;
case WEBSERVER_STATE_SendResponseHeader:
Webserver_SendResponseHeader();
break;
case WEBSERVER_STATE_SendMIMETypeHeader:
Webserver_SendMIMETypeHeader();
break;
case WEBSERVER_STATE_SendData:
Webserver_SendData();
break;
case WEBSERVER_STATE_Closing:
uip_close();
AppState->NextState = WEBSERVER_STATE_Closed;
break;
}
}
}
/** HTTP Server State handler for the Request Process state. This state manages the processing of incomming HTTP
* GET requests to the server from the receiving HTTP client.
*/
static void Webserver_OpenRequestedFile(void)
{
uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
char* AppData = (char*)uip_appdata;
/* No HTTP header received from the client, abort processing */
if (!(uip_newdata()))
return;
char* RequestToken = strtok(AppData, " ");
/* Must be a GET request, abort otherwise */
if (strcmp(RequestToken, "GET") != 0)
{
uip_abort();
break;
return;
}
char* RequestedFileName = strtok(NULL, " ");
@ -151,34 +187,50 @@ void WebserverApp_Callback(void)
/* Try to open the file from the Dataflash disk */
AppState->FileOpen = (f_open(&AppState->FileHandle, AppState->FileName, FA_OPEN_EXISTING | FA_READ) == FR_OK);
AppState->CurrentFilePos = 0;
AppState->PrevState = WEBSERVER_STATE_OpenRequestedFile;
/* Lock to the SendResponseHeader state until connection terminated */
AppState->CurrentState = WEBSERVER_STATE_SendResponseHeader;
}
AppState->NextState = WEBSERVER_STATE_SendResponseHeader;
}
/** HTTP Server State handler for the HTTP Response Header Send state. This state manages the transmission of
* the HTTP response header to the receiving HTTP client.
*/
static void Webserver_SendResponseHeader(void)
{
uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
char* AppData = (char*)uip_appdata;
char* HeaderToSend;
uint16_t HeaderLength;
break;
case WEBSERVER_STATE_SendResponseHeader:
/* Determine what HTTP header should be sent to the client */
if (AppState->FileOpen)
{
AppDataSize = strlen_P(HTTP200Header);
strncpy_P(AppData, HTTP200Header, AppDataSize);
HeaderToSend = HTTP200Header;
AppState->NextState = WEBSERVER_STATE_SendMIMETypeHeader;
}
else
{
AppDataSize = strlen_P(HTTP404Header);
strncpy_P(AppData, HTTP404Header, AppDataSize);
HeaderToSend = HTTP404Header;
AppState->NextState = WEBSERVER_STATE_Closing;
}
AppState->PrevState = WEBSERVER_STATE_SendResponseHeader;
AppState->CurrentState = WEBSERVER_STATE_SendMIMETypeHeader;
break;
case WEBSERVER_STATE_SendMIMETypeHeader:
/* File must have been found and opened for MIME header to be sent */
if (AppState->FileOpen)
{
HeaderLength = strlen_P(HeaderToSend);
strncpy_P(AppData, HeaderToSend, HeaderLength);
uip_send(AppData, HeaderLength);
}
/** HTTP Server State handler for the MIME Header Send state. This state manages the transmission of the file
* MIME type header for the requested file to the receiving HTTP client.
*/
static void Webserver_SendMIMETypeHeader(void)
{
uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
char* AppData = (char*)uip_appdata;
char* Extension = strpbrk(AppState->FileName, ".");
uint16_t MIMEHeaderLength = 0;
/* Check to see if a file extension was found for the requested filename */
if (Extension != NULL)
@ -188,63 +240,52 @@ void WebserverApp_Callback(void)
{
if (strcmp_P(&Extension[1], MIMETypes[i].Extension) == 0)
{
AppDataSize = strlen_P(MIMETypes[i].MIMEType);
strncpy_P(AppData, MIMETypes[i].MIMEType, AppDataSize);
MIMEHeaderLength = strlen_P(MIMETypes[i].MIMEType);
strncpy_P(AppData, MIMETypes[i].MIMEType, MIMEHeaderLength);
break;
}
}
}
/* Check if a MIME type was found and copied to the output buffer */
if (!(AppDataSize))
if (!(MIMEHeaderLength))
{
/* MIME type not found - copy over the default MIME type */
AppDataSize = strlen_P(DefaultMIMEType);
strncpy_P(AppData, DefaultMIMEType, AppDataSize);
MIMEHeaderLength = strlen_P(DefaultMIMEType);
strncpy_P(AppData, DefaultMIMEType, MIMEHeaderLength);
}
/* Add the end-of line terminator and end-of-headers terminator after the MIME type */
strncpy(&AppData[AppDataSize], "\r\n\r\n", sizeof("\r\n\r\n"));
AppDataSize += (sizeof("\r\n\r\n") - 1);
}
strncpy(&AppData[MIMEHeaderLength], "\r\n\r\n", sizeof("\r\n\r\n"));
MIMEHeaderLength += (sizeof("\r\n\r\n") - 1);
AppState->PrevState = WEBSERVER_STATE_SendMIMETypeHeader;
AppState->CurrentState = WEBSERVER_STATE_SendData;
break;
case WEBSERVER_STATE_SendData:
/* If end of file/file not open, progress to the close state */
if (!(AppState->FileOpen) && !(uip_rexmit()))
{
f_close(&AppState->FileHandle);
uip_close();
/* Send the MIME header to the receiving client */
uip_send(AppData, MIMEHeaderLength);
AppState->PrevState = WEBSERVER_STATE_Closed;
AppState->CurrentState = WEBSERVER_STATE_Closed;
break;
}
/* When the MIME header is ACKed, progress to the data send stage */
AppState->NextState = WEBSERVER_STATE_SendData;
}
/** HTTP Server State handler for the Data Send state. This state manages the transmission of file chunks
* to the receiving HTTP client.
*/
static void Webserver_SendData(void)
{
uip_tcp_appstate_t* const AppState = &uip_conn->appstate;
char* AppData = (char*)uip_appdata;
uint16_t MaxSegSize = uip_mss();
/* Must determine the maximum segment size to determine maximum file chunk size */
uint16_t MaxSegmentSize = uip_mss();
/* Return file pointer to the last ACKed position */
f_lseek(&AppState->FileHandle, AppState->CurrentFilePos);
f_lseek(&AppState->FileHandle, AppState->ACKedFilePos);
/* Read the next chunk of data from the open file */
f_read(&AppState->FileHandle, AppData, MaxSegSize, &AppDataSize);
f_read(&AppState->FileHandle, AppData, MaxSegmentSize, &AppState->SentChunkSize);
/* If we are not re-transmitting a lost segment, advance file position */
if (uip_acked() && !(uip_rexmit()))
{
AppState->FileOpen = (AppDataSize > 0);
AppState->CurrentFilePos += AppDataSize;
}
/* Stay in the SendData state if retransmission is required until all data sent */
AppState->PrevState = WEBSERVER_STATE_SendData;
break;
}
/* Send the next file chunk to the receiving client */
uip_send(AppData, AppState->SentChunkSize);
/* If data has been loaded into the application buffer by the server, send it to the client */
if (AppDataSize)
uip_send(AppData, AppDataSize);
/* Check if we are at the last chunk of the file, if so next ACK should close the connection */
AppState->NextState = (MaxSegmentSize != AppState->SentChunkSize) ? WEBSERVER_STATE_Closing : WEBSERVER_STATE_SendData;
}

8
Projects/Webserver/Lib/HTTPServerApp.h
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@ -51,6 +51,7 @@
WEBSERVER_STATE_SendResponseHeader, /**< Currently sending HTTP response headers to the client */
WEBSERVER_STATE_SendMIMETypeHeader, /**< Currently sending HTTP MIME type header to the client */
WEBSERVER_STATE_SendData, /**< Currently sending HTTP page data to the client */
WEBSERVER_STATE_Closing, /**< Ready to close the connection to the client */
WEBSERVER_STATE_Closed, /**< Connection closed after all data sent */
};
@ -70,4 +71,11 @@
void WebserverApp_Init(void);
void WebserverApp_Callback(void);
#if defined(INCLUDE_FROM_HTTPSERVERAPP_C)
static void Webserver_OpenRequestedFile(void);
static void Webserver_SendResponseHeader(void);
static void Webserver_SendMIMETypeHeader(void);
static void Webserver_SendData(void);
#endif
#endif

2
Projects/Webserver/Lib/uIPManagement.c
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@ -52,7 +52,7 @@ void uIPManagement_Init(void)
{
/* uIP Timing Initialization */
clock_init();
timer_set(&ConnectionTimer, CLOCK_SECOND / 2);
timer_set(&ConnectionTimer, CLOCK_SECOND / 10);
timer_set(&ARPTimer, CLOCK_SECOND * 10);
/* uIP Stack Initialization */

7
Projects/Webserver/Lib/uip/conf/apps-conf.h
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@ -5,13 +5,14 @@
typedef struct
{
uint8_t PrevState;
uint8_t CurrentState;
uint8_t NextState;
char FileName[30];
FIL FileHandle;
char FileName[50];
bool FileOpen;
uint32_t CurrentFilePos;
uint32_t ACKedFilePos;
uint16_t SentChunkSize;
} uip_tcp_appstate_t;
typedef struct

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