json.c
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#include "json.h"
uint8_t register_sensor(sensor sens)
{
uint8_t result;
if(sens.ID == PRESSURE_ADDR)
{
sens.additional_info = callibration_pressure_data_csv(get_pressure_callibration_data());
}
char *statement = prepare_json_register_statement(mod,sens);
chHeapFree(sens.additional_info);
sens.additional_info = NULL;
char sensor_ID[3];
sprintf(sensor_ID,"%d",sens.ID);
result = send_json(statement,strlen(statement),mod.ID,sensor_ID);
chHeapFree(statement);
return result;
}
char* prepare_json_observation_statement(char** data, uint32_t nObservations)
{
unsigned int i, length, observation_length;
char *json_statement, *str_aux, *str_aux2;
length = 17;
str_aux = join_strings("{\"observations\":[","",length,0,JOIN_NO_FREE);
for(i = 0; i < nObservations; i++)
{
str_aux2 = prepare_observation(data[i],strlen(data[i]));
observation_length = strlen(str_aux2);
str_aux = join_strings(str_aux,str_aux2,length,observation_length,JOIN_FREE_MEM);
length += observation_length;
}
length--; //REMOVE LAST ','
json_statement = join_strings(str_aux,"]}\0",length,3,JOIN_NO_FREE);
chHeapFree(str_aux);
return json_statement;
}
char* prepare_json_register_statement(module mod, sensor sens)
{
unsigned int length;
char *json_statement, *str_aux, *str_aux2;
char ID[MODULE_ID_LENGTH+3];
length = 23;
strcpy(ID,mod.ID);
sprintf(ID+MODULE_ID_LENGTH,"%X",sens.ID);
str_aux = join_strings("{\"sensors\":[{\"sensor\":\"",ID,length,MODULE_ID_LENGTH+2,JOIN_NO_FREE);
length += MODULE_ID_LENGTH+2;
str_aux2 = join_strings(str_aux,"\",\"description\":\"",length,17,JOIN_NO_FREE);
chHeapFree(str_aux);
length += 17;
str_aux = join_strings(str_aux2,sens.description,length,strlen(sens.description),JOIN_NO_FREE);
chHeapFree(str_aux2);
length += strlen(sens.description);
str_aux2 = join_strings(str_aux,"\",\"type\":\"",length,10,JOIN_NO_FREE);
chHeapFree(str_aux);
length += 10;
str_aux = join_strings(str_aux2,sens.type,length,strlen(sens.type),JOIN_NO_FREE);
chHeapFree(str_aux2);
length += strlen(sens.type);
str_aux2 = join_strings(str_aux,"\",\"unit\":\"",length,10,JOIN_NO_FREE);
chHeapFree(str_aux);
length += 10;
str_aux = join_strings(str_aux2,sens.unit,length,strlen(sens.unit),JOIN_NO_FREE);
chHeapFree(str_aux2);
length += strlen(sens.unit);
str_aux2 = join_strings(str_aux,"\",\"location\":\"",length,14,JOIN_NO_FREE);
chHeapFree(str_aux);
length += 14;
str_aux = join_strings(str_aux2,mod.geoloc,length,strlen(mod.geoloc),JOIN_NO_FREE);
chHeapFree(str_aux2);
length += strlen(mod.geoloc);
if(sens.additional_info != NULL)
{
str_aux2 = join_strings(str_aux,sens.additional_info,length,strlen(sens.additional_info),JOIN_NO_FREE);
chHeapFree(str_aux2);
length += strlen(sens.additional_info);
}
json_statement = join_strings(str_aux,"\"}]}\0",length,5,JOIN_NO_FREE);
chHeapFree(str_aux);
return json_statement;
}
char* prepare_observation(char* observation, uint32_t length)
{
char *json_data, *str_aux, *str_aux2;
/* TOPKEK
*
* ¿Gestión de errores?
* ¿PA QUÉ?
*
* --le trole
*/
int value_length = find_next_index(observation,length,','); //EXPECTS FORMATTING!!!
int timestamp_length = length - (value_length + 1);
char *value = (char*) chHeapAlloc(NULL,value_length+1);
char *timestamp = (char*) chHeapAlloc(NULL,timestamp_length+1);
strncpy(value,observation,value_length);
strncpy(timestamp,observation+(value_length+1),timestamp_length);
value[value_length] = '\0';
timestamp[timestamp_length] = '\0';
str_aux = join_strings("{\"value\":\"",value,10,value_length,JOIN_NO_FREE);
str_aux2 = join_strings(str_aux,"\",\"timestamp\":\"",10+value_length,15,JOIN_NO_FREE);
str_aux2 = join_strings(str_aux2,timestamp,25+value_length,timestamp_length,JOIN_FREE_MEM);
json_data = join_strings(str_aux2,"\"},",25+value_length+timestamp_length,3,JOIN_NO_FREE);
chHeapFree(str_aux);
chHeapFree(str_aux2);
chHeapFree(value);
return json_data;
}
uint8_t send_json(char* statement, uint32_t length, char* provider_ID, char* sensor_ID)
{
int connectivity, response_code;
char *URL, *PATH;
connectivity = libwismart_IsConnected();
if(connectivity != WISMART_CONNECTED)
{
return JSON_COMM_ERROR;
}
if(sensor_ID == NULL) //Register sensor
{
URL = (char*) chHeapAlloc(NULL,8+strlen(SERVER_HOSTNAME));
strcpy(URL,SERVER_HOSTNAME);
PATH = (char*) chHeapAlloc(NULL,10+strlen(provider_ID));
strcpy(PATH,"/catalog/");
strcpy(PATH+9,provider_ID);
}
else //Post data
{
URL = (char*) chHeapAlloc(NULL,1+strlen(SERVER_HOSTNAME));
strcpy(URL,SERVER_HOSTNAME);
URL[strlen(SERVER_HOSTNAME)] = '\0';
PATH = (char*) chHeapAlloc(NULL,22+strlen(provider_ID)+strlen(sensor_ID));
strcpy(PATH,"/data/modularupload/");
strcpy(PATH+20,provider_ID);
strcpy(PATH+20+strlen(provider_ID),sensor_ID);
PATH[21+strlen(provider_ID)+strlen(sensor_ID)] = '\0';
}
struct httpHeaders server = { put,PATH,strlen(PATH),URL,strlen(URL)};
response_code = httpRequest(server, statement, length);
chHeapFree(PATH);
chHeapFree(URL);
if(response_code == 200)
{
return JSON_POST_OK;
}
else if((response_code >= 400) && (response_code < 500))
{
return JSON_COMM_ERROR;
}
else
{
return JSON_OTHER_ERROR;
}
}
uint32_t find_next_index(char* string, uint32_t length, char delimiter)
{
unsigned int i;
for(i = 0; i < length; i++)
{
if(string[i] == delimiter)
{
return i;
}
}
return -1;
}
char* join_strings(char* str1, char* str2, uint32_t len1, uint32_t len2, uint8_t free_mem)
{
char* str = (char*) chHeapAlloc(NULL,len1+len2+1);
strncpy(str,str1,len1);
str[len1] = '\0';
strncat(str,str2,len2);
if(free_mem)
{
chHeapFree(str1);
chHeapFree(str2);
}
return str;
}