/* Some random cgi routines. Used in the LED example and the page that returns the entire flash as a binary. Also handles the hit counter on the main page. */ /* * ---------------------------------------------------------------------------- * "THE BEER-WARE LICENSE" (Revision 42): * Jeroen Domburg wrote this file. As long as you retain * this notice you can do whatever you want with this stuff. If we meet some day, * and you think this stuff is worth it, you can buy me a beer in return. * ---------------------------------------------------------------------------- */ #include #include "cgi.h" #include "uptime.h" #include "datalink.h" // ------------------------------------------------------------------------------- // Read multiple samples from the ADC as JSON typedef struct { uint32_t total_count; uint32_t done_count; bool success; } tplReadSamplesJSON_state; int FLASH_FN tplReadSamplesJSON(HttpdConnData *connData, char *token, void **arg) { char buff20[20]; tplReadSamplesJSON_state *st = *arg; if (token == NULL) { // end of template, cleanup if (st != NULL) free(st); return HTTPD_CGI_DONE; // cleanup } if (st == NULL) { // first call - allocate the struct st = malloc(sizeof(tplReadSamplesJSON_state)); *arg = st; // check how many samples are requested uint16_t count = 1; int len = httpdFindArg(connData->getArgs, "count", buff20, sizeof(buff20)); if (len != -1) count = (uint16_t)atoi(buff20); if (count > 4096) { warn("Requested %d samples, capping at 4096.", count); count = 4096; } st->total_count = count; st->done_count = 0; st->success = true; // TODO Start the capture } // the "success" field is after the data, // so if readout fails, success can be set to false. if (strcmp(token, "values") == 0) { if (st->done_count == 0) { dbg("Delay to simulate readout..."); // 1000 ms delay for(int i=0;i<1000;i++) { os_delay_us(1000); } } // TODO wait for data to be received // on error, terminate and proceed to the "success" field. u32 chunk = MIN(10, st->total_count - st->done_count); // chunks of 10 // chunk of data... for (u32 i = 0; i < chunk; i++, st->done_count++) { // preceding comma if not the first number if (st->done_count > 0) { httpdSend(connData, ", ", 2); } // one number os_sprintf(buff20, "%lu", os_random()); httpdSend(connData, buff20, -1); } // wait for more in this substitution if (st->done_count < st->total_count) return HTTPD_CGI_MORE; // more numbers to come } else if (strcmp(token, "success") == 0) { // success status httpdSend(connData, (st->success ? "true" : "false"), -1); } return HTTPD_CGI_DONE; } // Example of multi-pass generation of a html file /* // better to put it in the fs... int FLASH_FN cgiRandomNumbers(HttpdConnData *connData) { RandomNumberState *rns=connData->cgiData; char buff[128]; if (connData->conn == NULL) { //Connection aborted. Clean up. if (rns != NULL) free(rns); return HTTPD_CGI_DONE; } if (rns == NULL) { //First call to this cgi. Open the file so we can read it. rns=(RandomNumberState *)malloc(sizeof(RandomNumberState)); connData->cgiData=rns; // parse count uint32_t count = 1; int len = httpdFindArg(connData->getArgs, "count", buff, sizeof(buff)); if (len==-1) { // no such get arg } else { count = (uint32_t)atoi(buff); } rns->count_remain = count; printf("User wants %d numbers.", count); httpdStartResponse(connData, 200); httpdHeader(connData, "Content-Type", "text/html"); httpdEndHeaders(connData); // start the page httpdSend(connData, "" "" "" " Generated page." " " "" "" "

" "

Random numbers:

" "

", -1); return HTTPD_CGI_MORE; } // send end of the page if (rns->count_remain == 0) { httpdSend(connData, "", -1); free(rns); return HTTPD_CGI_DONE; } // print chunk of data for (int i = 0; i < 100; i++) { os_sprintf(buff, "

%lu\n", os_random()); httpdSend(connData, buff, -1); if (--rns->count_remain == 0) { break; } } return HTTPD_CGI_MORE; } */