John Lowe
Embedded WebSockets Experiment
HTTPServer/HTTPFS.h@0:6dee052a3fa4, 2011-07-26 (annotated)
- Committer:
- nandgate
- Date:
- Tue Jul 26 05:30:53 2011 +0000
- Revision:
- 0:6dee052a3fa4
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| nandgate | 0:6dee052a3fa4 | 1 | #ifndef HTTPFILESYSTEM_H |
| nandgate | 0:6dee052a3fa4 | 2 | #define HTTPFILESYSTEM_H |
| nandgate | 0:6dee052a3fa4 | 3 | |
| nandgate | 0:6dee052a3fa4 | 4 | #include "mbed.h" |
| nandgate | 0:6dee052a3fa4 | 5 | |
| nandgate | 0:6dee052a3fa4 | 6 | #include "HTTPServer.h" |
| nandgate | 0:6dee052a3fa4 | 7 | |
| nandgate | 0:6dee052a3fa4 | 8 | #define HTTP_BUFFER_SIZE 700 |
| nandgate | 0:6dee052a3fa4 | 9 | #define FILENAMELANGTH 100 |
| nandgate | 0:6dee052a3fa4 | 10 | |
| nandgate | 0:6dee052a3fa4 | 11 | /** |
| nandgate | 0:6dee052a3fa4 | 12 | * This class will store the data which are required for an request. |
| nandgate | 0:6dee052a3fa4 | 13 | * We are not in every case able to return all data at once, that means we have to store |
| nandgate | 0:6dee052a3fa4 | 14 | * the actual level of transmission. |
| nandgate | 0:6dee052a3fa4 | 15 | */ |
| nandgate | 0:6dee052a3fa4 | 16 | class HTTPFileSystemData : public HTTPData { |
| nandgate | 0:6dee052a3fa4 | 17 | public: |
| nandgate | 0:6dee052a3fa4 | 18 | int fleft; |
| nandgate | 0:6dee052a3fa4 | 19 | int bleft; |
| nandgate | 0:6dee052a3fa4 | 20 | int offset; |
| nandgate | 0:6dee052a3fa4 | 21 | FILE *file; |
| nandgate | 0:6dee052a3fa4 | 22 | char buffer[HTTP_BUFFER_SIZE]; |
| nandgate | 0:6dee052a3fa4 | 23 | |
| nandgate | 0:6dee052a3fa4 | 24 | virtual ~HTTPFileSystemData() { |
| nandgate | 0:6dee052a3fa4 | 25 | if(file) { |
| nandgate | 0:6dee052a3fa4 | 26 | fclose(file); |
| nandgate | 0:6dee052a3fa4 | 27 | file = 0; |
| nandgate | 0:6dee052a3fa4 | 28 | } |
| nandgate | 0:6dee052a3fa4 | 29 | } |
| nandgate | 0:6dee052a3fa4 | 30 | }; |
| nandgate | 0:6dee052a3fa4 | 31 | |
| nandgate | 0:6dee052a3fa4 | 32 | /** |
| nandgate | 0:6dee052a3fa4 | 33 | * This class will deliver files form the virtual file system. |
| nandgate | 0:6dee052a3fa4 | 34 | * Furthermore it is a simple example how to implement an HTTPHandler for big data requests. |
| nandgate | 0:6dee052a3fa4 | 35 | */ |
| nandgate | 0:6dee052a3fa4 | 36 | class HTTPFileSystemHandler : public HTTPHandler { |
| nandgate | 0:6dee052a3fa4 | 37 | public: |
| nandgate | 0:6dee052a3fa4 | 38 | /** |
| nandgate | 0:6dee052a3fa4 | 39 | * Create a new HTTPFileSzstemHandler. |
| nandgate | 0:6dee052a3fa4 | 40 | * @param prefix The Prefix is the URL Proefix in witch the Handler will work. |
| nandgate | 0:6dee052a3fa4 | 41 | * @param dir The Prefix will be directly mappt on the dir. |
| nandgate | 0:6dee052a3fa4 | 42 | */ |
| nandgate | 0:6dee052a3fa4 | 43 | HTTPFileSystemHandler(const char *path, const char *dir) : HTTPHandler(path), _dir(dir) {} |
| nandgate | 0:6dee052a3fa4 | 44 | HTTPFileSystemHandler(HTTPServer *server, const char *path, const char *dir) : HTTPHandler(path), _dir(dir) { server->addHandler(this); } |
| nandgate | 0:6dee052a3fa4 | 45 | |
| nandgate | 0:6dee052a3fa4 | 46 | private: |
| nandgate | 0:6dee052a3fa4 | 47 | /** |
| nandgate | 0:6dee052a3fa4 | 48 | * Check if a requested file exists. |
| nandgate | 0:6dee052a3fa4 | 49 | * If it exists open it and store the data back in the HTTPConnection. |
| nandgate | 0:6dee052a3fa4 | 50 | * We would not store connection specific data into the Handler. |
| nandgate | 0:6dee052a3fa4 | 51 | * If the file exists and we cann serve a page return HTTP_OK else HTTP_NotFound. |
| nandgate | 0:6dee052a3fa4 | 52 | * @param con The Connection which will be handled. |
| nandgate | 0:6dee052a3fa4 | 53 | */ |
| nandgate | 0:6dee052a3fa4 | 54 | virtual HTTPStatus init(HTTPConnection *con) const { |
| nandgate | 0:6dee052a3fa4 | 55 | char filename[FILENAMELANGTH]; |
| nandgate | 0:6dee052a3fa4 | 56 | HTTPFileSystemData *data = new HTTPFileSystemData(); |
| nandgate | 0:6dee052a3fa4 | 57 | printf("FS: %s\n", con->getURL()); |
| nandgate | 0:6dee052a3fa4 | 58 | snprintf(filename, FILENAMELANGTH, "%s%s\0", _dir, con->getURL() + strlen(_prefix)); |
| nandgate | 0:6dee052a3fa4 | 59 | |
| nandgate | 0:6dee052a3fa4 | 60 | printf("filename: %s\n", filename); |
| nandgate | 0:6dee052a3fa4 | 61 | |
| nandgate | 0:6dee052a3fa4 | 62 | data->file = fopen(filename, "r"); |
| nandgate | 0:6dee052a3fa4 | 63 | if(!data->file) { |
| nandgate | 0:6dee052a3fa4 | 64 | delete data; |
| nandgate | 0:6dee052a3fa4 | 65 | return HTTP_NotFound; |
| nandgate | 0:6dee052a3fa4 | 66 | } |
| nandgate | 0:6dee052a3fa4 | 67 | data->fleft = fleft(data->file); |
| nandgate | 0:6dee052a3fa4 | 68 | data->bleft = 0; |
| nandgate | 0:6dee052a3fa4 | 69 | data->offset = 0; |
| nandgate | 0:6dee052a3fa4 | 70 | |
| nandgate | 0:6dee052a3fa4 | 71 | con->data = data; |
| nandgate | 0:6dee052a3fa4 | 72 | con->setLength(data->fleft); |
| nandgate | 0:6dee052a3fa4 | 73 | loadFromFile(con); |
| nandgate | 0:6dee052a3fa4 | 74 | return HTTP_OK; |
| nandgate | 0:6dee052a3fa4 | 75 | } |
| nandgate | 0:6dee052a3fa4 | 76 | |
| nandgate | 0:6dee052a3fa4 | 77 | /** |
| nandgate | 0:6dee052a3fa4 | 78 | * Send the maximum available data chunk to the Client. |
| nandgate | 0:6dee052a3fa4 | 79 | * If it is the last chunk close connection by returning HTTP_SuccessEnded |
| nandgate | 0:6dee052a3fa4 | 80 | * @param con The connection to handle |
| nandgate | 0:6dee052a3fa4 | 81 | * @param maximum The maximal available sendbuffer size. |
| nandgate | 0:6dee052a3fa4 | 82 | * @return HTTP_Success when mor data is available or HTTP_SuccessEnded when the file is complete. |
| nandgate | 0:6dee052a3fa4 | 83 | */ |
| nandgate | 0:6dee052a3fa4 | 84 | virtual HTTPHandle send(HTTPConnection *con, int maximum) const { |
| nandgate | 0:6dee052a3fa4 | 85 | HTTPFileSystemData *data = static_cast<HTTPFileSystemData *>(con->data); |
| nandgate | 0:6dee052a3fa4 | 86 | err_t err; |
| nandgate | 0:6dee052a3fa4 | 87 | u16_t len = min(data->bleft, maximum); |
| nandgate | 0:6dee052a3fa4 | 88 | if(len) { |
| nandgate | 0:6dee052a3fa4 | 89 | do { |
| nandgate | 0:6dee052a3fa4 | 90 | err = con->write( |
| nandgate | 0:6dee052a3fa4 | 91 | &data->buffer[data->offset], len, (((!data->fleft)&&(data->bleft==len))? |
| nandgate | 0:6dee052a3fa4 | 92 | (TCP_WRITE_FLAG_COPY | TCP_WRITE_FLAG_MORE) : (TCP_WRITE_FLAG_COPY))); |
| nandgate | 0:6dee052a3fa4 | 93 | if(err == ERR_MEM) { |
| nandgate | 0:6dee052a3fa4 | 94 | len /= 2; |
| nandgate | 0:6dee052a3fa4 | 95 | } |
| nandgate | 0:6dee052a3fa4 | 96 | } while (err == ERR_MEM && len > 1); |
| nandgate | 0:6dee052a3fa4 | 97 | |
| nandgate | 0:6dee052a3fa4 | 98 | if(err == ERR_OK) { |
| nandgate | 0:6dee052a3fa4 | 99 | data->offset += len; |
| nandgate | 0:6dee052a3fa4 | 100 | data->bleft -= len; |
| nandgate | 0:6dee052a3fa4 | 101 | } |
| nandgate | 0:6dee052a3fa4 | 102 | } |
| nandgate | 0:6dee052a3fa4 | 103 | return loadFromFile(con); |
| nandgate | 0:6dee052a3fa4 | 104 | } |
| nandgate | 0:6dee052a3fa4 | 105 | |
| nandgate | 0:6dee052a3fa4 | 106 | /** |
| nandgate | 0:6dee052a3fa4 | 107 | * Returns the left size of a file. |
| nandgate | 0:6dee052a3fa4 | 108 | * @param fd The filehandler of which we want to know the filesize. |
| nandgate | 0:6dee052a3fa4 | 109 | * @return The filesize of fd. |
| nandgate | 0:6dee052a3fa4 | 110 | */ |
| nandgate | 0:6dee052a3fa4 | 111 | long fleft(FILE *fd) const { |
| nandgate | 0:6dee052a3fa4 | 112 | long len, cur; |
| nandgate | 0:6dee052a3fa4 | 113 | cur = ftell(fd); |
| nandgate | 0:6dee052a3fa4 | 114 | fseek(fd, 0, SEEK_END); |
| nandgate | 0:6dee052a3fa4 | 115 | len = ftell(fd); |
| nandgate | 0:6dee052a3fa4 | 116 | fseek(fd, cur, SEEK_SET); |
| nandgate | 0:6dee052a3fa4 | 117 | return len; |
| nandgate | 0:6dee052a3fa4 | 118 | } |
| nandgate | 0:6dee052a3fa4 | 119 | |
| nandgate | 0:6dee052a3fa4 | 120 | /** |
| nandgate | 0:6dee052a3fa4 | 121 | * Fill the buffer if the buffer is empty. |
| nandgate | 0:6dee052a3fa4 | 122 | * If the file is complete close the filehandler and return HTTP_SuccessEnded. |
| nandgate | 0:6dee052a3fa4 | 123 | */ |
| nandgate | 0:6dee052a3fa4 | 124 | HTTPHandle loadFromFile(HTTPConnection *con) const { |
| nandgate | 0:6dee052a3fa4 | 125 | HTTPFileSystemData *data = static_cast<HTTPFileSystemData *>(con->data); |
| nandgate | 0:6dee052a3fa4 | 126 | if(!data->bleft) { |
| nandgate | 0:6dee052a3fa4 | 127 | if(data->fleft) { |
| nandgate | 0:6dee052a3fa4 | 128 | int len = fread(&data->buffer[0], sizeof(char), HTTP_BUFFER_SIZE, data->file); |
| nandgate | 0:6dee052a3fa4 | 129 | data->fleft -= len; |
| nandgate | 0:6dee052a3fa4 | 130 | data->bleft = len; |
| nandgate | 0:6dee052a3fa4 | 131 | data->offset = 0; |
| nandgate | 0:6dee052a3fa4 | 132 | } else { |
| nandgate | 0:6dee052a3fa4 | 133 | if(data->file) { |
| nandgate | 0:6dee052a3fa4 | 134 | fclose(data->file); |
| nandgate | 0:6dee052a3fa4 | 135 | data->file = 0; |
| nandgate | 0:6dee052a3fa4 | 136 | } |
| nandgate | 0:6dee052a3fa4 | 137 | return HTTP_SuccessEnded; |
| nandgate | 0:6dee052a3fa4 | 138 | } |
| nandgate | 0:6dee052a3fa4 | 139 | } |
| nandgate | 0:6dee052a3fa4 | 140 | return HTTP_Success; |
| nandgate | 0:6dee052a3fa4 | 141 | } |
| nandgate | 0:6dee052a3fa4 | 142 | |
| nandgate | 0:6dee052a3fa4 | 143 | /** The Directory which will replace the prefix of the URL */ |
| nandgate | 0:6dee052a3fa4 | 144 | const char *_dir; |
| nandgate | 0:6dee052a3fa4 | 145 | }; |
| nandgate | 0:6dee052a3fa4 | 146 | |
| nandgate | 0:6dee052a3fa4 | 147 | #endif |