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.
RdWebServer.cpp
- Committer:
- Bobty
- Date:
- 2013-10-04
- Revision:
- 2:9d8793c23b46
- Parent:
- 1:75bb184de749
- Child:
- 3:594136d34a32
File content as of revision 2:9d8793c23b46:
#include "RdWebServer.h" #define MAX_CMDSTR_LEN 100 #define MAX_ARGSTR_LEN 100 bool RdFileCacheEntry::readLocalFileIntoCache(char* fileName) { printf("Reading into cache %s\n\r", fileName); LocalFileSystem local("local"); FILE* fp = fopen(fileName, "r"); if (fp == NULL) { printf("Failed to open file\n\r"); return false; } fseek(fp, 0, SEEK_END); _nFileLen = (int)ftell(fp); _pFileContent = new char[_nFileLen]; if (!_pFileContent) { printf("Failed to allocate %lu\n\r", _nFileLen); fclose(fp); return false; } fseek(fp, 0, SEEK_SET); char* pMem = _pFileContent; char fileBuf[500]; int totCnt = 0; int rdCnt; while ((rdCnt = fread(fileBuf, sizeof( char ), 500, fp)) == 500) { memcpy(pMem, fileBuf, rdCnt); pMem += rdCnt; totCnt += rdCnt; } memcpy(pMem, fileBuf, rdCnt); totCnt += rdCnt; fclose(fp); printf("Success in caching %d bytes (read %d)\n\r", _nFileLen, totCnt); _bCacheValid = true; return true; } RdWebServer::RdWebServer() { _serverIsListening = false; _pStatusLed = NULL; } RdWebServer::~RdWebServer() { // Clean-up - probably never called as we're on a microcontroller! for (std::vector<RdWebServerCmdDef*>::iterator it = _commands.begin() ; it != _commands.end(); ++it) delete (*it); } bool RdWebServer::init(int port, DigitalOut* pStatusLed) { _port = port; _pStatusLed = pStatusLed; // _socketSrv.set_blocking(true); //setup tcp socket if(_socketSrv.bind(port)< 0) { printf("TCP server bind fail\n\r"); return false; } else { // printf("TCP server bind success\n\r"); _serverIsListening = true; } if(_socketSrv.listen(1) < 0) { printf("TCP server listen fail\n\r"); return false; } else { printf("TCP server is listening...\r\n"); } 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::sendFromCache(RdFileCacheEntry* pCacheEntry, TCPSocketConnection* pClient, char* httpHeader) { printf ("Sending file %s from cache %d bytes\r\n", pCacheEntry->_fileName, pCacheEntry->_nFileLen); sprintf(httpHeader,"HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nConnection: Close\r\n\r\n"); pClient->send(httpHeader,strlen(httpHeader)); char* pMem = pCacheEntry->_pFileContent; int nLenLeft = pCacheEntry->_nFileLen; int blkSize = 2048; while(nLenLeft > 0) { if (blkSize > nLenLeft) blkSize = nLenLeft; pClient->send_all(pMem, blkSize); pMem += blkSize; nLenLeft -= blkSize; } } void RdWebServer::handleLocalFileRequest(char* inFileName, char* argStr, TCPSocketConnection* pClient, char* httpHeader, bool bCacheIfPossible) { const int HTTPD_MAX_FNAME_LENGTH = 127; char localFilename[HTTPD_MAX_FNAME_LENGTH+1]; char reqFileNameStr[HTTPD_MAX_FNAME_LENGTH+1]; printf("Requesting local file %s\n\r", inFileName); sprintf(reqFileNameStr, "/%s", inFileName); sprintf(localFilename, "/local/%s", inFileName); if (bCacheIfPossible) { // Check if file already cached bool bTryToCache = true; for (std::vector<RdFileCacheEntry*>::iterator it = _cachedFiles.begin() ; it != _cachedFiles.end(); ++it) { if (strcmp(inFileName, (*it)->_fileName) == 0) { if ((*it)->_bCacheValid) { sendFromCache(*it, pClient, httpHeader); return; } bTryToCache = false; // don't try to cache as cacheing must have already failed } } // See if we can cache the file if (bTryToCache) { RdFileCacheEntry* pCacheEntry = new RdFileCacheEntry(inFileName); if (pCacheEntry) { bool bCacheSuccess = pCacheEntry->readLocalFileIntoCache(localFilename); // Store the cache entry even if reading failed (mem alloc or file not found, etc) so we don't try to cache again _cachedFiles.push_back(pCacheEntry); if (bCacheSuccess) { sendFromCache(pCacheEntry, pClient, httpHeader); return; } } } } LocalFileSystem local("local"); FILE* fp = fopen(localFilename, "r"); if (fp == NULL) { printf ("Local file %s not found\r\n", localFilename); sprintf(httpHeader,"HTTP/1.1 404 Not Found \r\nContent-Type: text\r\nConnection: Close\r\n\r\n"); pClient->send(httpHeader,strlen(httpHeader)); pClient->send(reqFileNameStr,strlen(reqFileNameStr)); } else { printf ("Sending file %s from disk\r\n", localFilename); sprintf(httpHeader,"HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nConnection: Close\r\n\r\n"); pClient->send(httpHeader,strlen(httpHeader)); int rdCnt = 0; char fileBuf[2000]; while ((rdCnt = fread(fileBuf, sizeof( char ), 2000, fp)) == 2000) { pClient->send_all(fileBuf, rdCnt); } pClient->send_all(fileBuf, rdCnt); fclose(fp); } } void RdWebServer::handleSDFileRequest(char* inFileName, char* argStr, TCPSocketConnection* pClient, char* httpHeader) { const int HTTPD_MAX_FNAME_LENGTH = 127; char filename[HTTPD_MAX_FNAME_LENGTH+1]; printf("Requesting file %s\n\r", inFileName); char *lstchr = strrchr(inFileName, NULL) -1; if ('/' == *lstchr) { // printf("Open directory /sd/%s\n", inFileName); *lstchr = 0; sprintf(filename, "/sd/%s", inFileName); DIR *d = opendir(filename); if (d != NULL) { sprintf(httpHeader,"HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nConnection: Close\r\n\r\n"); pClient->send(httpHeader,strlen(httpHeader)); sprintf(httpHeader,"<html><head><title>Directory Listing</title></head><body><h1>%s</h1><ul>", inFileName); pClient->send(httpHeader,strlen(httpHeader)); struct dirent *p; while((p = readdir(d)) != NULL) { // printf("%s\n", p->d_name); sprintf(httpHeader,"<li>%s</li>", p->d_name); pClient->send(httpHeader,strlen(httpHeader)); } } closedir(d); // printf("Directory closed\n"); sprintf(httpHeader,"</ul></body></html>"); pClient->send(httpHeader,strlen(httpHeader)); } else { sprintf(filename, "/sd/%s", inFileName); // printf ("Filename %s\r\n", filename); FILE* fp = fopen(filename, "r"); if (fp == NULL) { printf ("Filename %s not found\r\n", filename); sprintf(httpHeader,"HTTP/1.1 404 Not Found \r\nContent-Type: text\r\nConnection: Close\r\n\r\n"); pClient->send(httpHeader,strlen(httpHeader)); pClient->send(inFileName,strlen(inFileName)); } else { printf ("Sending file %s\r\n", filename); sprintf(httpHeader,"HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nConnection: Close\r\n\r\n"); pClient->send(httpHeader,strlen(httpHeader)); int rdCnt = 0; char fileBuf[1024]; while ((rdCnt = fread(fileBuf, sizeof( char ), 1024, fp)) == 1024) { pClient->send(fileBuf, rdCnt); } pClient->send(fileBuf, rdCnt); fclose(fp); } } } void RdWebServer::run() { TCPSocketConnection client; const int HTTPD_MAX_HDR_LENGTH = 255; char httpHeader[HTTPD_MAX_HDR_LENGTH+1]; const int HTTPD_MAX_REQ_LENGTH = 1023; char buffer[HTTPD_MAX_REQ_LENGTH+1]; //listening for http GET request while (isListening()) { //blocking mode(never timeout) if(_socketSrv.accept(client)<0) { printf("TCP Socket failed to accept connection\n\r"); } else { client.set_blocking(false, 1000); printf("Connection from IP: %s\n\r",client.get_address()); if (_pStatusLed != NULL) *_pStatusLed = true; Timer connectLimitTimer; connectLimitTimer.start(); while(connectLimitTimer.read() < 5) // 5 seconds timeout on HTTP operation { int rxLen = client.receive(buffer, 1023); if (rxLen == -1) { continue; } else if (rxLen == 0) { printf("received buffer is empty.\n\r"); break; } else if (rxLen >= 1024) { sprintf(httpHeader,"HTTP/1.1 413 Request Entity Too Large \r\nContent-Type: text\r\nConnection: Close\r\n\r\n"); client.send(httpHeader,strlen(httpHeader)); client.send(buffer, rxLen); break; } buffer[rxLen] = '\0'; // printf("Received Data: %d\n\r\n\r%.*s\n\r",strlen(buffer),strlen(buffer),buffer); if (strncmp(buffer, "GET ", 4) == 0) { // 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); bool cmdFound = false; for (std::vector<RdWebServerCmdDef*>::iterator it = _commands.begin() ; it != _commands.end(); ++it) { // printf("Testing <<%s>> with <<%s>>\r\n", (*it)->_pCmdStr, cmdStr); if (strcasecmp((*it)->_pCmdStr, cmdStr) == 0) { printf("FoundCmd <%s> Type %d\n\r", cmdStr, (*it)->_cmdType); cmdFound = true; if ((*it)->_cmdType == RdWebServerCmdDef::CMD_CALLBACK) { ((*it)->_callback)(cmdStr, argStr); } else if ((*it)->_cmdType == RdWebServerCmdDef::CMD_LOCALFILE) { if ((*it)->_substFileName[0] != '\0') handleLocalFileRequest((*it)->_substFileName, argStr, &client, httpHeader, (*it)->_bCacheIfPossible); else handleLocalFileRequest(cmdStr, argStr, &client, httpHeader, (*it)->_bCacheIfPossible); } else if ((*it)->_cmdType == RdWebServerCmdDef::CMD_SDCARDFILE) { if ((*it)->_substFileName[0] != '\0') handleSDFileRequest((*it)->_substFileName, argStr, &client, httpHeader); else handleSDFileRequest(cmdStr, argStr, &client, httpHeader); } break; } } // If command not found see if it is a local file if (!cmdFound) handleLocalFileRequest(cmdStr, argStr, &client, httpHeader, false); } //setup http response header & data /* char httpHeader[256] = {}; sprintf(httpHeader,"HTTP/1.1 200 OK\n\rContent-Length: %d\n\rContent-Type: text\n\rConnection: Close\n\r\n\r",strlen(buffer)); client.send(httpHeader,strlen(httpHeader)); client.send(cmdStr,strlen(cmdStr)); */ //clientIsConnected = false; // printf("Server done.\n\r"); break; } } printf("Connection closed ... TCP server is listening...\r\n"); client.close(); if (_pStatusLed != NULL) *_pStatusLed = false; } } } void RdWebServer::addCommand(char* pCmdStr, int cmdType, CmdCallbackType callback, char* substFileName, bool cacheIfPossible) { _commands.push_back(new RdWebServerCmdDef(pCmdStr, cmdType, callback, substFileName, cacheIfPossible)); }