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:
- 2015-05-04
- Revision:
- 13:4f9c09d3da13
- Parent:
- 12:c14ffd4ec125
- Child:
- 14:4b83670854f0
File content as of revision 13:4f9c09d3da13:
/* RdWebServer.cpp Rob Dobson 2013 Inspired by Jasper Schuurmans multi-threaded web server for Netduino http://www.schuurmans.cc/multi-threaded-web-server-for-netduino-plus More details at http://robdobson.com/2013/10/moving-my-window-shades-control-to-mbed/ */ #define RDWEB_DEBUG 5 #include "RdWebServer.h" #define MAX_CMDSTR_LEN 100 #define MAX_ARGSTR_LEN 100 #define MAX_FILENAME_LEN (MAX_ARGSTR_LEN + 20) 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, char* pBaseWebFolder) { _port = port; _pStatusLed = pStatusLed; _pBaseWebFolder = pBaseWebFolder; _socketSrv.set_blocking(true); //setup tcp socket if(_socketSrv.bind(port)< 0) { RD_WARN("TCP server bind fail\n\r"); return false; } else { RD_DBG("TCP server bind success\n\r"); _serverIsListening = true; } if(_socketSrv.listen(1) < 0) { RD_WARN("TCP server listen fail\n\r"); return false; } else { RD_INFO("TCP server is listening...\r\n"); } return true; } void RdWebServer::handleReceivedHttp(TCPSocketConnection &client) { RD_DBG("Received Data: %d\n\r\n\r%.*s\n\r",strlen(_buffer),strlen(_buffer),_buffer); int method = METHOD_OTHER; if (strncmp(_buffer, "GET ", 4) == 0) method = METHOD_GET; if (strncmp(_buffer, "POST", 4) == 0) method = METHOD_POST; char cmdStr[MAX_CMDSTR_LEN]; char argStr[MAX_ARGSTR_LEN]; if (extractCmdArgs(_buffer+3, cmdStr, MAX_CMDSTR_LEN, argStr, MAX_ARGSTR_LEN)) { RD_DBG("CmdStr %s\n\r", cmdStr); RD_DBG("ArgStr %s\n\r", argStr); bool cmdFound = false; for (std::vector<RdWebServerCmdDef*>::iterator it = _commands.begin() ; it != _commands.end(); ++it) { RD_DBG("Testing <<%s>> with <<%s>>\r\n", (*it)->_pCmdStr, cmdStr); if (strcasecmp((*it)->_pCmdStr, cmdStr) == 0) { RD_DBG("FoundCmd <%s> Type %d\n\r", cmdStr, (*it)->_cmdType); cmdFound = true; if ((*it)->_cmdType == RdWebServerCmdDef::CMD_CALLBACK) { char* respStr = ((*it)->_callback)(method, cmdStr, argStr); client.send(respStr, strlen(respStr)); } else if ((*it)->_cmdType == RdWebServerCmdDef::CMD_LOCALFILE) { if ((*it)->_substFileName[0] != '\0') { char combinedFileName[MAX_FILENAME_LEN]; strcpy(combinedFileName, (*it)->_substFileName); if (combinedFileName[strlen(combinedFileName)-1] == '*') strcpy(combinedFileName+strlen(combinedFileName)-1, argStr); handleLocalFileRequest(combinedFileName, argStr, client, _httpHeader, (*it)->_bCacheIfPossible); } else { handleLocalFileRequest(cmdStr, argStr, client, _httpHeader, (*it)->_bCacheIfPossible); } } else if ((*it)->_cmdType == RdWebServerCmdDef::CMD_SDORUSBFILE) { if ((*it)->_substFileName[0] != '\0') { char combinedFileName[MAX_FILENAME_LEN]; strcpy(combinedFileName, (*it)->_substFileName); if (combinedFileName[strlen(combinedFileName)-1] == '*') strcpy(combinedFileName+strlen(combinedFileName)-1, argStr); handleSDFileRequest(combinedFileName, argStr, client, _httpHeader); } else { handleSDFileRequest(cmdStr, argStr, client, _httpHeader); } } break; } } // If command not found see if it is a local file if (!cmdFound) handleSDFileRequest(cmdStr, argStr, client, _httpHeader); } } void RdWebServer::run() { TCPSocketConnection client; Timer connectLimitTimer; while (isListening()) { RD_INFO("Waiting for TCP connection\r\n"); if(_socketSrv.accept(client)<0) { RD_WARN("TCP Socket failed to accept connection\n\r"); } else { client.set_blocking(false, 2000); RD_INFO("Connection from IP: %s\n\r",client.get_address()); if (_pStatusLed != NULL) *_pStatusLed = true; connectLimitTimer.reset(); connectLimitTimer.start(); while(true) { // Check connection timer - 10 seconds timeout on HTTP operation if (connectLimitTimer.read() >= 10) { RD_WARN("Connection timed out\n\r"); break; } // Get received data int rxLen = client.receive(_buffer, HTTPD_MAX_REQ_LENGTH); if (rxLen == -1) { RD_WARN("Nothing received\n\r"); continue; } else if (rxLen == 0) { RD_WARN("received buffer is empty.\n\r"); continue; } else if (rxLen > HTTPD_MAX_REQ_LENGTH) { 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); continue; } _buffer[rxLen] = '\0'; // Handle buffer handleReceivedHttp(client); // Done break; } // Connection now closed RD_INFO("Connection closed ...\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)); } void RdWebServer::handleSDFileRequest(char* inFileName, char* argStr, TCPSocketConnection &client, char* httpHeader) { const int HTTPD_MAX_FNAME_LENGTH = 127; char filename[HTTPD_MAX_FNAME_LENGTH+1]; RD_INFO("Requesting file %s\n\r", inFileName); #ifdef SUPPORT_FOLDER_VIEW if ((strlen(inFileName) > 0) && (inFileName[strlen(inFileName)-1] == '/')) { RD_INFO("Request directory %s%s\r\n", _pBaseWebFolder, inFileName); sprintf(filename, "%s%s", _pBaseWebFolder, 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"); client.send(httpHeader,strlen(httpHeader)); sprintf(httpHeader,"<html><head><title>Directory Listing</title></head><body><h1>%s</h1><ul>", inFileName); client.send(httpHeader,strlen(httpHeader)); struct dirent *p; while((p = readdir(d)) != NULL) { RD_INFO("%s\r\n", p->d_name); sprintf(httpHeader,"<li>%s</li>", p->d_name); client.send(httpHeader,strlen(httpHeader)); } } closedir(d); RD_DBG("Directory closed\n"); sprintf(httpHeader,"</ul></body></html>"); client.send(httpHeader,strlen(httpHeader)); } else #endif { sprintf(filename, "%s%s", _pBaseWebFolder, inFileName); RD_INFO("Filename %s\r\n", filename); FILE* fp = fopen(filename, "r"); if (fp == NULL) { RD_WARN("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"); client.send(httpHeader,strlen(httpHeader)); client.send(inFileName,strlen(inFileName)); } else { RD_INFO("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"); client.send(httpHeader,strlen(httpHeader)); int rdCnt = 0; char fileBuf[1024]; while ((rdCnt = fread(fileBuf, sizeof( char ), 1024, fp)) == 1024) { client.send_all(fileBuf, rdCnt); } client.send(fileBuf, rdCnt); fclose(fp); } } } void RdWebServer::sendFromCache(RdFileCacheEntry* pCacheEntry, TCPSocketConnection &client, char* httpHeader) { RD_INFO("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"); client.send(httpHeader,strlen(httpHeader)); char* pMem = pCacheEntry->_pFileContent; int nLenLeft = pCacheEntry->_nFileLen; int blkSize = 2048; while(nLenLeft > 0) { if (blkSize > nLenLeft) blkSize = nLenLeft; client.send_all(pMem, blkSize); pMem += blkSize; nLenLeft -= blkSize; } } void RdWebServer::handleLocalFileRequest(char* inFileName, char* argStr, TCPSocketConnection &client, char* httpHeader, bool bCacheIfPossible) { #ifdef SUPPORT_LOCAL_FILESYSTEM const int HTTPD_MAX_FNAME_LENGTH = 127; char localFilename[HTTPD_MAX_FNAME_LENGTH+1]; char reqFileNameStr[HTTPD_MAX_FNAME_LENGTH+1]; RD_INFO("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, client, 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, client, httpHeader); return; } } } } LocalFileSystem local("local"); FILE* fp = fopen(localFilename, "r"); if (fp == NULL) { RD_WARN("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"); client.send(httpHeader,strlen(httpHeader)); client.send(reqFileNameStr,strlen(reqFileNameStr)); } else { RD_INFO("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"); client.send(httpHeader,strlen(httpHeader)); int rdCnt = 0; char fileBuf[2000]; while ((rdCnt = fread(fileBuf, sizeof( char ), 2000, fp)) == 2000) { client.send_all(fileBuf, rdCnt); } client.send_all(fileBuf, rdCnt); fclose(fp); } #else RD_WARN("Local file system not supported\r\n"); sprintf(httpHeader,"HTTP/1.1 404 Not Found \r\nContent-Type: text\r\nConnection: Close\r\n\r\n"); client.send(httpHeader,strlen(httpHeader)); client.send_all(inFileName,strlen(inFileName)); #endif } bool RdFileCacheEntry::readLocalFileIntoCache(char* fileName) { #ifdef SUPPORT_LOCAL_FILESYSTEM RD_INFO("Reading into cache %s\n\r", fileName); LocalFileSystem local("local"); FILE* fp = fopen(fileName, "r"); if (fp == NULL) { RD_WARN("Failed to open file\n\r"); return false; } RD_DBG("Seeking\n\r"); fseek(fp, 0, SEEK_END); _nFileLen = (int)ftell(fp); _pFileContent = new char[_nFileLen]; RD_DBG("Len %d Buf %08x\n\r", _nFileLen, _pFileContent); if (!_pFileContent) { RD_WARN("Failed to allocate %lu\n\r", _nFileLen); fclose(fp); return false; } RD_DBG("Allocated\n\r"); memset(_pFileContent, 0, _nFileLen); fseek(fp, 0, SEEK_SET); char* pMem = _pFileContent; char fileBuf[100]; int totCnt = 0; int rdCnt = 0; RD_DBG("Reading\n\r"); while (true) { int toRead = _nFileLen - totCnt; if (toRead > sizeof(fileBuf)) toRead = sizeof(fileBuf); if (toRead <= 0) break; rdCnt = fread(fileBuf, sizeof(char), toRead, fp); if (rdCnt <= 0) break; RD_DBG("Read %d tot %d of %d\n\r", rdCnt, totCnt, _nFileLen); memcpy(pMem, fileBuf, rdCnt); pMem += rdCnt; totCnt += rdCnt; } RD_DBG("Done read\n\r"); fclose(fp); RD_DBG("Success in caching %d bytes (read %d)\n\r", _nFileLen, totCnt); _bCacheValid = true; return true; #else return false; #endif } 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; // Check for first slash char* pSlash1 = strchr(buf, '/'); if (pSlash1 == NULL) return false; pSlash1++; // Extract command while(*pSlash1) { if (cmdStrLen >= maxCmdStrLen-1) break; if ((*pSlash1 == '/') || (*pSlash1 == ' ') || (*pSlash1 == '\n') || (*pSlash1 == '?') || (*pSlash1 == '&')) break; *pCmdStr++ = *pSlash1++; *pCmdStr = '\0'; cmdStrLen++; } if ((*pSlash1 == '\0') || (*pSlash1 == ' ') || (*pSlash1 == '\n')) return true; // Now args *pSlash1++; while(*pSlash1) { if (argStrLen >= maxArgStrLen-1) break; if ((*pSlash1 == ' ') || (*pSlash1 == '\n')) break; *pArgStr++ = *pSlash1++; *pArgStr = '\0'; argStrLen++; } return true; }