Rob Dobson
A simple web server mainly based on ideas from Jasper Schuurmans Netduino web server
Dependents: RdBlindsServer SpideyWallWeb RdGasUseMonitor
A fast and reliable web server for MBED! http://robdobson.com/2015/08/a-reliable-mbed-webserver/
It has a very neat way to implement REST commands and can serve files from local storage (on LPC1768 for instance) and from SD cards. It also has a caching facility which is particularly useful for serving files from local storage.
The server can be run in the main() thread (and has a sub-2ms response time if this is done) or in a mbed-rtos thread which increases the response time to (a still respectable) 30ms or so.
The latest project that uses this is here - https://developer.mbed.org/users/Bobty/code/SpideyWallWeb/
int main (void)
{
// Ethernet interface
EthernetInterface::init();
// Connect ethernet
EthernetInterface::connect();
// Init the web server
pc.printf("Starting web server\r\n");
char* baseWebFolder = "/sd/"; // should be /sd/ for SDcard files - not used for local file system
RdWebServer webServer;
// Add commands to handle the home page and favicon
webServer.addCommand("", RdWebServerCmdDef::CMD_LOCALFILE, NULL, "index.htm", true);
webServer.addCommand("favicon.ico", RdWebServerCmdDef::CMD_LOCALFILE, NULL, NULL, true);
// Add the lightwall control commands
webServer.addCommand("name", RdWebServerCmdDef::CMD_CALLBACK, &lightwallGetSystemName);
webServer.addCommand("clear", RdWebServerCmdDef::CMD_CALLBACK, &lightwallClear);
webServer.addCommand("rawfill", RdWebServerCmdDef::CMD_CALLBACK, &lightwallRawFill);
webServer.addCommand("fill", RdWebServerCmdDef::CMD_CALLBACK, &lightwallFill);
webServer.addCommand("showleds", RdWebServerCmdDef::CMD_CALLBACK, &lightwallShowLeds);
// Start the server
webServer.init(WEBPORT, &led4, baseWebFolder);
webServer.run();
}
// Get system name - No arguments required
char* lightwallGetSystemName(int method, char*cmdStr, char* argStr, char* msgBuffer, int msgLen,
int contentLen, unsigned char* pPayload, int payloadLen, int splitPayloadPos)
{
// Perform any required actions here ....
// ...
// Return the system name
return systemName;
}
This server was originally based on a Netduino web server from Jasper Schuurmans but has been optimised for speed.
Revision 1:75bb184de749, committed 2013-09-19
- Comitter:
- Bobty
- Date:
- Thu Sep 19 12:06:18 2013 +0000
- Parent:
- 0:b5b4d07f7827
- Child:
- 2:9d8793c23b46
- Commit message:
- Added code to support commands - still a lot of test code in place though
Changed in this revision
| RdWebServer.cpp | Show annotated file Show diff for this revision Revisions of this file |
| RdWebServer.h | Show annotated file Show diff for this revision Revisions of this file |
--- a/RdWebServer.cpp Wed Sep 18 21:36:50 2013 +0000
+++ b/RdWebServer.cpp Thu Sep 19 12:06:18 2013 +0000
@@ -1,5 +1,8 @@
#include "RdWebServer.h"
+#define MAX_CMDSTR_LEN 100
+#define MAX_ARGSTR_LEN 100
+
RdWebServer::RdWebServer()
{
_serverIsListening = false;
@@ -43,6 +46,43 @@
return true;
}
+bool RdWebServer::extractCmdArgs(char* buf, char* pCmdStr, int maxCmdStrLen, char* pArgStr, int maxArgStrLen)
+{
+ *pCmdStr = '\0';
+ *pArgStr = '\0';
+ int cmdStrLen = 0;
+ int argStrLen = 0;
+ if (buf == NULL)
+ return false;
+ char* pSlash1 = strchr(buf, '/');
+ if (pSlash1 == NULL)
+ return false;
+ pSlash1++;
+ while(*pSlash1)
+ {
+ if (cmdStrLen >= maxCmdStrLen-1)
+ break;
+ if ((*pSlash1 == '/') || (*pSlash1 == ' ') || (*pSlash1 == '\n'))
+ break;
+ *pCmdStr++ = *pSlash1++;
+ *pCmdStr = '\0';
+ cmdStrLen++;
+ }
+ if ((*pSlash1 == '\0') || (*pSlash1 == ' ') || (*pSlash1 == '\n'))
+ return true;
+ *pSlash1++;
+ while(*pSlash1)
+ {
+ if (argStrLen >= maxArgStrLen-1)
+ break;
+ if ((*pSlash1 == ' ') || (*pSlash1 == '\n'))
+ break;
+ *pArgStr++ = *pSlash1++;
+ *pArgStr = '\0';
+ argStrLen++;
+ }
+ return true;
+}
void RdWebServer::run()
{
@@ -82,15 +122,29 @@
if(buffer[0] == 'G' && buffer[1] == 'E' && buffer[2] == 'T' )
{
printf("GET request incomming.\n\r");
-
+ char cmdStr[MAX_CMDSTR_LEN];
+ char argStr[MAX_ARGSTR_LEN];
+ if (extractCmdArgs(buffer+3, cmdStr, MAX_CMDSTR_LEN, argStr, MAX_ARGSTR_LEN))
+ {
+ printf("CmdStr %s\n\r", cmdStr);
+ printf("ArgStr %s\n\r", argStr);
+ for (std::vector<RdWebServerCmdDef*>::iterator it = _commands.begin() ; it != _commands.end(); ++it)
+ {
+ if (strcasecmp((*it)->_pCmdStr, cmdStr) == 0)
+ {
+ printf("FoundCmd %s\n\r", cmdStr);
+ ((*it)->_callback)(argStr);
+ }
+ }
+ }
//setup http response header & data
char echoHeader[256] = {};
sprintf(echoHeader,"HTTP/1.1 200 OK\n\rContent-Length: %d\n\rContent-Type: text\n\rConnection: Close\n\r\n\r",strlen(buffer));
client.send(echoHeader,strlen(echoHeader));
- client.send(buffer,strlen(buffer));
+ client.send(cmdStr,strlen(cmdStr));
clientIsConnected = false;
- printf("echo back done.\n\r");
+ printf("done.\n\r");
}
break;
}
@@ -103,3 +157,8 @@
}
}
+void RdWebServer::addCommand(char* pCmdStr, CmdCallbackType callback)
+{
+ _commands.push_back(new RdWebServerCmdDef(pCmdStr, callback));
+}
+
--- a/RdWebServer.h Wed Sep 18 21:36:50 2013 +0000
+++ b/RdWebServer.h Thu Sep 19 12:06:18 2013 +0000
@@ -1,11 +1,25 @@
#ifndef RD_WEB_SERVER
#define RD_WEB_SERVER
-#include <map>
+#include <vector>
#include "mbed.h"
#include "EthernetInterface.h"
+typedef void (*CmdCallbackType)(char* argStr);
+
+class RdWebServerCmdDef
+{
+ public:
+ RdWebServerCmdDef(char* pStr, CmdCallbackType callback)
+ {
+ _pCmdStr = pStr;
+ _callback = callback;
+ };
+ char* _pCmdStr;
+ CmdCallbackType _callback;
+};
+
class RdWebServer
{
public :
@@ -20,11 +34,17 @@
return _serverIsListening;
};
+ void addCommand(char* pCmdStr, CmdCallbackType callback);
+
private :
int _port;
DigitalOut* _pStatusLed;
TCPSocketServer _socketSrv;
bool _serverIsListening;
+ std::vector<RdWebServerCmdDef*> _commands;
+ bool extractCmdArgs(char* buf, char* pCmdStr, int maxCmdStrLen, char* pArgStr, int maxArgStrLen);
+
+
};
#endif