Ilya I
Example program with HTTPServer and sensor data streaming over TCPSockets, using Donatien Garnier's Net APIs and services code on top of LWIP. Files StreamServer.h and .cpp encapsulate streaming over TCPSockets. Broadcast is done by sendToAll(), and all incoming data is echoed back to the client. Echo code can be replaced with some remote control of the streaming interface. See main() that shows how to periodically send some data to all subscribed clients. To subscribe, a client should open a socket at <mbed_ip> port 123. I used few lines in TCL code to set up a quick sink for the data. HTTP files are served on port 80 concurrently to the streaming.
services/http/client/data/HTTPFile.cpp@1:3ee499525aa5, 2010-06-14 (annotated)
- Committer:
- iva2k
- Date:
- Mon Jun 14 03:24:33 2010 +0000
- Revision:
- 1:3ee499525aa5
- Parent:
- 0:e614f7875b60
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| iva2k | 0:e614f7875b60 | 1 | |
| iva2k | 0:e614f7875b60 | 2 | /* |
| iva2k | 0:e614f7875b60 | 3 | Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com) |
| iva2k | 0:e614f7875b60 | 4 | |
| iva2k | 0:e614f7875b60 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy |
| iva2k | 0:e614f7875b60 | 6 | of this software and associated documentation files (the "Software"), to deal |
| iva2k | 0:e614f7875b60 | 7 | in the Software without restriction, including without limitation the rights |
| iva2k | 0:e614f7875b60 | 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| iva2k | 0:e614f7875b60 | 9 | copies of the Software, and to permit persons to whom the Software is |
| iva2k | 0:e614f7875b60 | 10 | furnished to do so, subject to the following conditions: |
| iva2k | 0:e614f7875b60 | 11 | |
| iva2k | 0:e614f7875b60 | 12 | The above copyright notice and this permission notice shall be included in |
| iva2k | 0:e614f7875b60 | 13 | all copies or substantial portions of the Software. |
| iva2k | 0:e614f7875b60 | 14 | |
| iva2k | 0:e614f7875b60 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| iva2k | 0:e614f7875b60 | 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| iva2k | 0:e614f7875b60 | 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| iva2k | 0:e614f7875b60 | 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| iva2k | 0:e614f7875b60 | 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| iva2k | 0:e614f7875b60 | 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| iva2k | 0:e614f7875b60 | 21 | THE SOFTWARE. |
| iva2k | 0:e614f7875b60 | 22 | */ |
| iva2k | 0:e614f7875b60 | 23 | |
| iva2k | 0:e614f7875b60 | 24 | #include "HTTPFile.h" |
| iva2k | 0:e614f7875b60 | 25 | |
| iva2k | 0:e614f7875b60 | 26 | HTTPFile::HTTPFile(const char* path) : HTTPData(), m_fp(NULL), m_path(path), m_len(0), m_chunked(false) |
| iva2k | 0:e614f7875b60 | 27 | { |
| iva2k | 0:e614f7875b60 | 28 | |
| iva2k | 0:e614f7875b60 | 29 | } |
| iva2k | 0:e614f7875b60 | 30 | |
| iva2k | 0:e614f7875b60 | 31 | HTTPFile::~HTTPFile() |
| iva2k | 0:e614f7875b60 | 32 | { |
| iva2k | 0:e614f7875b60 | 33 | closeFile(); |
| iva2k | 0:e614f7875b60 | 34 | } |
| iva2k | 0:e614f7875b60 | 35 | |
| iva2k | 0:e614f7875b60 | 36 | void HTTPFile::clear() |
| iva2k | 0:e614f7875b60 | 37 | { |
| iva2k | 0:e614f7875b60 | 38 | closeFile(); |
| iva2k | 0:e614f7875b60 | 39 | //Force reopening |
| iva2k | 0:e614f7875b60 | 40 | } |
| iva2k | 0:e614f7875b60 | 41 | |
| iva2k | 0:e614f7875b60 | 42 | int HTTPFile::read(char* buf, int len) |
| iva2k | 0:e614f7875b60 | 43 | { |
| iva2k | 0:e614f7875b60 | 44 | if(!openFile("r")) //File does not exist, or I/O error... |
| iva2k | 0:e614f7875b60 | 45 | return 0; |
| iva2k | 0:e614f7875b60 | 46 | len = fread(buf, 1, len, m_fp); |
| iva2k | 0:e614f7875b60 | 47 | if( feof(m_fp) ) |
| iva2k | 0:e614f7875b60 | 48 | { |
| iva2k | 0:e614f7875b60 | 49 | //File read completely, we can close it |
| iva2k | 0:e614f7875b60 | 50 | closeFile(); |
| iva2k | 0:e614f7875b60 | 51 | } |
| iva2k | 0:e614f7875b60 | 52 | return len; |
| iva2k | 0:e614f7875b60 | 53 | } |
| iva2k | 0:e614f7875b60 | 54 | |
| iva2k | 0:e614f7875b60 | 55 | int HTTPFile::write(const char* buf, int len) |
| iva2k | 0:e614f7875b60 | 56 | { |
| iva2k | 0:e614f7875b60 | 57 | if(!openFile("w")) //File does not exist, or I/O error... |
| iva2k | 0:e614f7875b60 | 58 | return 0; |
| iva2k | 0:e614f7875b60 | 59 | len = fwrite(buf, 1, len, m_fp); |
| iva2k | 0:e614f7875b60 | 60 | if( (!m_chunked && (ftell(m_fp) >= m_len)) || |
| iva2k | 0:e614f7875b60 | 61 | (m_chunked && !len) ) |
| iva2k | 0:e614f7875b60 | 62 | { |
| iva2k | 0:e614f7875b60 | 63 | //File received completely, we can close it |
| iva2k | 0:e614f7875b60 | 64 | closeFile(); |
| iva2k | 0:e614f7875b60 | 65 | } |
| iva2k | 0:e614f7875b60 | 66 | return len; |
| iva2k | 0:e614f7875b60 | 67 | } |
| iva2k | 0:e614f7875b60 | 68 | |
| iva2k | 0:e614f7875b60 | 69 | string HTTPFile::getDataType() //Internet media type for Content-Type header |
| iva2k | 0:e614f7875b60 | 70 | { |
| iva2k | 0:e614f7875b60 | 71 | return ""; //Unknown |
| iva2k | 0:e614f7875b60 | 72 | } |
| iva2k | 0:e614f7875b60 | 73 | |
| iva2k | 0:e614f7875b60 | 74 | void HTTPFile::setDataType(const string& type) //Internet media type from Content-Type header |
| iva2k | 0:e614f7875b60 | 75 | { |
| iva2k | 0:e614f7875b60 | 76 | //Do not really care here |
| iva2k | 0:e614f7875b60 | 77 | } |
| iva2k | 0:e614f7875b60 | 78 | |
| iva2k | 0:e614f7875b60 | 79 | bool HTTPFile::getIsChunked() //For Transfer-Encoding header |
| iva2k | 0:e614f7875b60 | 80 | { |
| iva2k | 0:e614f7875b60 | 81 | return false; |
| iva2k | 0:e614f7875b60 | 82 | } |
| iva2k | 0:e614f7875b60 | 83 | |
| iva2k | 0:e614f7875b60 | 84 | void HTTPFile::setIsChunked(bool chunked) //From Transfer-Encoding header |
| iva2k | 0:e614f7875b60 | 85 | { |
| iva2k | 0:e614f7875b60 | 86 | m_chunked = chunked; |
| iva2k | 0:e614f7875b60 | 87 | } |
| iva2k | 0:e614f7875b60 | 88 | |
| iva2k | 0:e614f7875b60 | 89 | int HTTPFile::getDataLen() //For Content-Length header |
| iva2k | 0:e614f7875b60 | 90 | { |
| iva2k | 0:e614f7875b60 | 91 | return m_len; |
| iva2k | 0:e614f7875b60 | 92 | } |
| iva2k | 0:e614f7875b60 | 93 | |
| iva2k | 0:e614f7875b60 | 94 | void HTTPFile::setDataLen(int len) //From Content-Length header, or if the transfer is chunked, next chunk length |
| iva2k | 0:e614f7875b60 | 95 | { |
| iva2k | 0:e614f7875b60 | 96 | if(!m_chunked) |
| iva2k | 0:e614f7875b60 | 97 | m_len = len; //Useful so that we can close file when last byte is written |
| iva2k | 0:e614f7875b60 | 98 | } |
| iva2k | 0:e614f7875b60 | 99 | |
| iva2k | 0:e614f7875b60 | 100 | bool HTTPFile::openFile(const char* mode) //true on success, false otherwise |
| iva2k | 0:e614f7875b60 | 101 | { |
| iva2k | 0:e614f7875b60 | 102 | if(m_fp) |
| iva2k | 0:e614f7875b60 | 103 | return true; |
| iva2k | 0:e614f7875b60 | 104 | |
| iva2k | 0:e614f7875b60 | 105 | m_fp = fopen(m_path.c_str(), mode); |
| iva2k | 0:e614f7875b60 | 106 | if(m_fp && mode[0]=='r') |
| iva2k | 0:e614f7875b60 | 107 | { |
| iva2k | 0:e614f7875b60 | 108 | //Seek EOF to get length |
| iva2k | 0:e614f7875b60 | 109 | fseek(m_fp, 0, SEEK_END); |
| iva2k | 0:e614f7875b60 | 110 | m_len = ftell(m_fp); |
| iva2k | 0:e614f7875b60 | 111 | fseek(m_fp, 0, SEEK_SET); //Goto SOF |
| iva2k | 0:e614f7875b60 | 112 | } |
| iva2k | 0:e614f7875b60 | 113 | |
| iva2k | 0:e614f7875b60 | 114 | if(!m_fp) |
| iva2k | 0:e614f7875b60 | 115 | return false; |
| iva2k | 0:e614f7875b60 | 116 | |
| iva2k | 0:e614f7875b60 | 117 | return true; |
| iva2k | 0:e614f7875b60 | 118 | } |
| iva2k | 0:e614f7875b60 | 119 | |
| iva2k | 0:e614f7875b60 | 120 | void HTTPFile::closeFile() |
| iva2k | 0:e614f7875b60 | 121 | { |
| iva2k | 0:e614f7875b60 | 122 | if(m_fp) |
| iva2k | 0:e614f7875b60 | 123 | fclose(m_fp); |
| iva2k | 0:e614f7875b60 | 124 | } |