osd-contiki/apps/time/resource_timestamp.c
Ralf Schlatterbeck f48566d51f Add wallclock time handling
New application and new example.
We use the built-in timer routines and add an offset to get the
wallclock time. The offset can be set by time-changing routines
(currently only settimeofday).
We also maintain an offset for timezone handling but this isn't
currently fully implemented.
2014-05-29 17:31:19 +02:00

159 lines
4.4 KiB
C

/**
* \file
* Resource for timestamp handling
* \author
* Ralf Schlatterbeck <rsc@runtux.com>
*
* \brief get/put time in seconds since 1970 (UNIX time)
* Note: the internal format of the time in seconds is a 64bit number
* unfortunately javascript (json) will only support double for which
* the mantissa isn't long enough for representing that number. So we're
* back to 32 bit and have a year 2038 problem.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "contiki.h"
#include "time.h"
#include "time_resource.h"
#include "jsonparse.h"
/* Only coap 13 for now */
#include "er-coap-13.h"
/* Error-handling macro */
# define BYE(_exp, _tag) \
do { \
PRINTF("Expect "_exp": %d\n",_tag); \
success=0; \
goto bye; \
} while(0)
#define DEBUG 1
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
RESOURCE \
( timestamp, METHOD_GET | METHOD_PUT
, "clock/timestamp"
, "title=\"Time\";rt=\"timestamp\""
);
void
timestamp_handler
( void* request
, void* response
, uint8_t *buffer
, uint16_t preferred_size
, int32_t *offset
)
{
int success = 1;
int i;
char temp[100];
int index = 0;
int length = 0;
int tag = 0;
const uint8_t *bytes = NULL;
size_t len = 0;
struct timeval tv;
int n_acc = 0;
const uint16_t *accept = NULL;
uint16_t a_ctype = REST.type.APPLICATION_JSON;
uint16_t c_ctype = REST.get_header_content_type (request);
/* Seems like accepted type is currently unsupported? */
n_acc = REST.get_header_accept (request, &accept);
for (i=0; i<n_acc; i++) {
if ( accept [i] == REST.type.TEXT_PLAIN
|| accept [i] == REST.type.APPLICATION_JSON
)
{
a_ctype = accept [i];
break;
}
}
switch(REST.get_method_type(request)) {
case METHOD_GET:
gettimeofday (&tv, NULL);
// TEXT format
if (a_ctype == REST.type.TEXT_PLAIN) {
index += sprintf (temp + index, "%ld\n", (long)tv.tv_sec);
} else { // jSON Format
// FIXME: Platform doesn't seem to support long long printing
// We get empty string
index += sprintf
( temp + index
,"{\n \"timestamp\" : \"%ld\"\n}\n"
, (long)tv.tv_sec
);
}
length = strlen(temp);
memcpy (buffer, temp, length);
REST.set_header_content_type (response, a_ctype);
REST.set_response_payload (response, buffer, length);
break;
case METHOD_PUT:
if ((len = coap_get_payload(request, &bytes))) {
if (c_ctype == REST.type.TEXT_PLAIN) {
temp [sizeof (temp) - 1] = 0;
strncpy (temp, (char *)bytes, MIN (len, sizeof (temp) - 1));
} else { // jSON Format
struct jsonparse_state state;
struct jsonparse_state *parser = &state;
PRINTF ("PUT: len: %d, %s\n", len, (char *)bytes);
jsonparse_setup (parser, (char *)bytes, len);
if ((tag = jsonparse_next (parser)) != JSON_TYPE_OBJECT) {
BYE ("OBJECT", tag);
}
if ((tag = jsonparse_next (parser)) != JSON_TYPE_PAIR_NAME) {
BYE ("PAIR_NAME", tag);
}
while (jsonparse_strcmp_value (parser, "timestamp") != 0) {
tag = jsonparse_next (parser);
if (tag != JSON_TYPE_PAIR) {
BYE ("PAIR", tag);
}
tag = jsonparse_next (parser);
tag = jsonparse_next (parser);
if (tag != ',') {
BYE (",", tag);
}
tag = jsonparse_next (parser);
if (tag != JSON_TYPE_PAIR_NAME) {
BYE ("PAIR_NAME", tag);
}
}
tag = jsonparse_next (parser);
if (tag != JSON_TYPE_PAIR) {
BYE ("PAIR", tag);
}
tag = jsonparse_next (parser);
if (tag != JSON_TYPE_STRING) {
BYE ("STRING", tag);
}
jsonparse_copy_value (parser, temp, sizeof (temp));
}
// FIXME: Platform has no strtoll (long long)?
tv.tv_sec = strtol (temp, NULL, 10);
settimeofday (&tv, NULL);
REST.set_response_status(response, REST.status.CHANGED);
} else {
success = 0;
}
bye :
break;
default:
success = 0;
}
if (!success) {
REST.set_response_status(response, REST.status.BAD_REQUEST);
}
}