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storage.c
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/*
* OwnTracks Recorder
* Copyright (C) 2015-2023 Jan-Piet Mens <[email protected]>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#define __USE_XOPEN 1
#define _GNU_SOURCE 1
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <errno.h>
#include <fnmatch.h>
#include <unistd.h>
#include <glob.h>
#include <ctype.h>
#include <assert.h>
#include <sys/stat.h>
#include "utstring.h"
#include "storage.h"
#include "geohash.h"
#include "fences.h"
#include "gcache.h"
#include "util.h"
#include "listsort.h"
char STORAGEDIR[BUFSIZ] = STORAGEDEFAULT;
#define LINESIZE 8192
#define LARGEBUF (BUFSIZ * 2)
static struct gcache *gc = NULL;
void storage_init(int revgeo)
{
setenv("TZ", "UTC", 1);
if (revgeo) {
char path[LARGEBUF];
snprintf(path, LARGEBUF, "%s/ghash", STORAGEDIR);
gc = gcache_open(path, NULL, TRUE);
if (gc == NULL) {
olog(LOG_ERR, "storage_init(): gc is NULL");
}
}
}
void storage_gcache_dump(char *lmdbname)
{
char path[LARGEBUF];
snprintf(path, LARGEBUF, "%s/ghash", STORAGEDIR);
gcache_dump(path, lmdbname);
}
void storage_gcache_load(char *lmdbname)
{
char path[LARGEBUF];
snprintf(path, LARGEBUF, "%s/ghash", STORAGEDIR);
gcache_load(path, lmdbname);
}
void get_geo(JsonNode *o, char *ghash)
{
JsonNode *geo;
if ((geo = gcache_json_get(gc, ghash)) != NULL) {
json_copy_to_object(o, geo, FALSE);
json_delete(geo);
}
}
/*
* Populate a JSON object (`obj') keyed by directory name; each element points
* to a JSON array with a list of subdirectories on the first level.
*
* { "jpm": [ "5s", "nex4" ], "jjolie": [ "iphone5" ] }
*
* Returns 1 on failure.
*/
static int user_device_list(char *name, int level, JsonNode *obj)
{
DIR *dirp;
struct dirent *dp;
char path[BUFSIZ];
JsonNode *devlist;
int rc = 0;
struct stat sb;
if ((dirp = opendir(name)) == NULL) {
perror(name);
return (1);
}
while ((dp = readdir(dirp)) != NULL) {
if (*dp->d_name != '.') {
sprintf(path, "%s/%s", name, dp->d_name);
if (stat(path, &sb) != 0) {
continue;
}
if (!S_ISDIR(sb.st_mode))
continue;
if (level == 0) {
devlist = json_mkarray();
json_append_member(obj, dp->d_name, devlist);
rc = user_device_list(path, level + 1, devlist);
} else if (level == 1) {
json_append_element(obj, json_mkstring(dp->d_name));
}
}
}
closedir(dirp);
return (rc);
}
#if WITH_GREENWICH
/*
* See if we have batt,ext,status data for this device, and if so, add
* their arrays into the JSON object at `last'.
*/
static void get_gw_data(char *username, char *device, JsonNode *last)
{
JsonNode *array;
static char *types[] = { "batt", "ext", "status", NULL };
char **t, *js;
static UT_string *ts = NULL, *u = NULL, *d = NULL;
if (last == NULL || last->tag != JSON_OBJECT)
return;
for (t = types; t && *t; t++) {
utstring_renew(u);
utstring_renew(d);
utstring_printf(u, "%s", username);
utstring_printf(d, "%s", device);
lowercase(UB(u));
lowercase(UB(d));
utstring_renew(ts);
utstring_printf(ts, "%s/last/%s/%s/%s.json",
STORAGEDIR,
UB(u),
UB(d),
*t);
/* Read file into JSON array and append to `last' object */
if ((js = slurp_file(UB(ts), TRUE)) != NULL) {
if ((array = json_decode(js)) != NULL) {
json_append_member(last, *t, array);
}
free(js);
}
}
}
#endif /* GREENWICH */
void append_card_to_object(JsonNode *obj, char *user, char *device)
{
char path[LARGEBUF], path1[LARGEBUF], *cardfile = NULL;
JsonNode *card;
if (!user || !*user)
return;
snprintf(path, LARGEBUF, "%s/cards/%s/%s/%s-%s.json",
STORAGEDIR, user, device, user, device);
if (access(path, R_OK) == 0) {
cardfile = path;
} else {
snprintf(path1, LARGEBUF, "%s/cards/%s/%s.json",
STORAGEDIR, user, user);
if (access(path1, R_OK) == 0) {
cardfile = path1;
}
}
card = json_mkobject();
if (cardfile && json_copy_from_file(card, cardfile) == TRUE) {
json_copy_to_object(obj, card, FALSE);
}
json_delete(card);
}
void append_device_details(JsonNode *userlist, char *user, char *device)
{
char path[LARGEBUF];
JsonNode *node, *last;
snprintf(path, LARGEBUF, "%s/last/%s/%s/%s-%s.json",
STORAGEDIR, user, device, user, device);
last = json_mkobject();
if (json_copy_from_file(last, path) == TRUE) {
JsonNode *tst;
if ((tst = json_find_member(last, "tst")) != NULL) {
json_append_member(last, "isotst", json_mkstring(isotime(tst->number_)));
json_append_member(last, "disptst", json_mkstring(disptime(tst->number_)));
}
}
append_card_to_object(last, user, device);
if ((node = json_find_member(last, "ghash")) != NULL) {
if (node->tag == JSON_STRING) {
get_geo(last, node->string_);
}
}
/* Extra data */
snprintf(path, LARGEBUF, "%s/last/%s/%s/extra.json",
STORAGEDIR, user, device);
json_copy_from_file(last, path);
#if WITH_GREENWICH
get_gw_data(user, device, last);
#endif
json_append_element(userlist, last);
}
/*
* Return an array of users gleaned from LAST with merged details.
* If user and device are specified, limit to those; either may be
* NULL. If `fields' is not NULL, it's a JSON array of fields to
* be returned.
*/
JsonNode *last_users(char *in_user, char *in_device, JsonNode *fields)
{
JsonNode *obj = json_mkobject();
JsonNode *un, *dn, *userlist = json_mkarray();
char path[LARGEBUF], user[BUFSIZ], device[BUFSIZ];
snprintf(path, LARGEBUF, "%s/last", STORAGEDIR);
// fprintf(stderr, "last_users(%s, %s)\n", (in_user) ? in_user : "<nil>",
// (in_device) ? in_device : "<nil>");
if (user_device_list(path, 0, obj) == 1) {
json_delete(userlist);
return (obj);
}
/* Loop through users, devices */
json_foreach(un, obj) {
if (un->tag != JSON_ARRAY)
continue;
strcpy(user, un->key);
json_foreach(dn, un) {
if (dn->tag == JSON_STRING) {
strcpy(device, dn->string_);
} else if (dn->tag == JSON_NUMBER) { /* all digits? */
sprintf(device, "%.lf", dn->number_);
}
if (!in_user && !in_device) {
append_device_details(userlist, user, device);
} else if (in_user && !in_device) {
if (strcmp(user, in_user) == 0) {
append_device_details(userlist, user, device);
}
} else if (in_user && in_device) {
if (strcmp(user, in_user) == 0 && strcmp(device, in_device) == 0) {
append_device_details(userlist, user, device);
}
}
}
}
json_delete(obj);
/*
* userlist now is an array of user objects. If fields were
* specified, re-create that array with object which have
* only the requested fields. It's a shame we have to re-do
* this here, but I can't think of an alternative way at
* the moment.
*/
if (fields) {
JsonNode *new_userlist = json_mkarray(), *user;
json_foreach(user, userlist) {
JsonNode *o = json_mkobject(), *f, *j;
json_foreach(f, fields) {
char *field_name = f->string_;
if ((j = json_find_member(user, field_name)) != NULL) {
json_copy_element_to_object(o, field_name, j);
}
}
json_append_element(new_userlist, o);
}
json_delete(userlist);
return (new_userlist);
}
return (userlist);
}
/*
* `s' has a time string in it. Try to convert into time_t
* using a variety of formats from higher to lower precision.
* Return 1 on success, 0 on failure.
*/
static int str_time_to_secs(char *s, time_t *secs)
{
static char **f, *formats[] = {
"%Y-%m-%dT%H:%M:%S",
"%Y-%m-%dT%H:%M",
"%Y-%m-%dT%H",
"%Y-%m-%dt%H:%M:%S",
"%Y-%m-%dt%H:%M",
"%Y-%m-%dt%H",
"%Y-%m-%d",
"%Y-%m",
NULL
};
struct tm tm;
int success = 0;
memset(&tm, 0, sizeof(struct tm));
for (f = formats; f && *f; f++) {
if (strptime(s, *f, &tm) != NULL) {
success = 1;
// fprintf(stderr, "str_time_to_secs succeeds with %s\n", *f);
break;
}
}
if (!success)
return (0);
tm.tm_mday = (tm.tm_mday < 1) ? 1 : tm.tm_mday;
tm.tm_isdst = -1; /* A negative value for tm_isdst causes
* the mktime() function to attempt to
* divine whether summer time is in
* effect for the specified time. */
*secs = mktime(&tm);
// fprintf(stderr, "str_time_to_secs: %s becomes %04d-%02d-%02d %02d:%02d:%02d\n",
// s,
// tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
// tm.tm_hour, tm.tm_min, tm.tm_sec);
return (1);
}
/*
* For each of the strings, create an epoch time at the s_ pointers. If
* a string is NULL, use a default time (from: HOURS previous, to: now)
* Return 1 if the time conversion was successful and from <= to.
*/
int make_times(char *time_from, time_t *s_lo, char *time_to, time_t *s_hi, int hours)
{
time_t now;
time(&now);
if (!time_from || !*time_from) {
*s_lo = now - (60 * 60 * ((hours) ? hours : DEFAULT_HISTORY_HOURS));
} else {
if (str_time_to_secs(time_from, s_lo) == 0)
return (0);
}
if (!time_to || !*time_to) {
*s_hi = now;
} else {
if (str_time_to_secs(time_to, s_hi) == 0)
return (0);
}
return (*s_lo > *s_hi ? 0 : 1);
}
/*
* List the directories in the directory at `path' and put
* the names into a JSON array which is in obj.
*/
static void ls(char *path, JsonNode *obj)
{
DIR *dirp;
struct dirent *dp;
JsonNode *jarr = json_mkarray();
if (obj == NULL || obj->tag != JSON_OBJECT) {
json_delete(jarr);
return;
}
if ((dirp = opendir(path)) == NULL) {
json_append_member(obj, "error", json_mkstring("Cannot open requested directory"));
json_delete(jarr);
return;
}
while ((dp = readdir(dirp)) != NULL) {
bool is_dir = false;
/* XFS doesn't support d_type, and it's used on CentOS 7.
* Ensure we can determine whether something's a directory.
*/
if (dp->d_type == DT_DIR) {
is_dir = true;
} else {
struct stat st;
static UT_string *fullp = NULL;
utstring_renew(fullp);
utstring_printf(fullp, "%s/%s", path, dp->d_name);
assert(stat(UB(fullp), &st) != -1);
is_dir = S_ISDIR(st.st_mode);
}
if (is_dir && (*dp->d_name != '.')) {
json_append_element(jarr, json_mkstring(dp->d_name));
}
}
json_append_member(obj, "results", jarr);
closedir(dirp);
}
/*
* List the files in the directory at `pathpat' and
* put the names into a new JSON array in obj. Filenames (2015-08.rec)
* are checked whether they fall (time-wise) into the times between
* s_lo and s_hi.
*/
static time_t t_lo, t_hi; /* must be global so that filter() can access them */
static int filter_filename(const struct dirent *d)
{
struct tm tmfile, *tm;
int lo_months, hi_months, file_months;
/* if the filename doesn't look like YYYY-MM.rec we can safely ignore it.
* Needs modifying after the year 2999 ;-) */
if (fnmatch("2[0-9][0-9][0-9]-[0-3][0-9].rec", d->d_name, 0) != 0)
return (0);
/* Convert filename (YYYY-MM) to a tm; see if months falls between
* from months and to months. */
memset(&tmfile, 0, sizeof(struct tm));
if (strptime(d->d_name, "%Y-%m", &tmfile) == NULL) {
fprintf(stderr, "filter: convert err");
return (0);
}
file_months = (tmfile.tm_year + 1900) * 12 + tmfile.tm_mon;
tm = gmtime(&t_lo);
lo_months = (tm->tm_year + 1900) * 12 + tm->tm_mon;
tm = gmtime(&t_hi);
hi_months = (tm->tm_year + 1900) * 12 + tm->tm_mon;
/*
printf("filter: file %s has %04d-%02d-%02d %02d:%02d:%02d\n",
d->d_name,
tmfile.tm_year + 1900, tmfile.tm_mon + 1, tmfile.tm_mday,
tmfile.tm_hour, tmfile.tm_min, tmfile.tm_sec);
*/
if (file_months >= lo_months && file_months <= hi_months) {
// fprintf(stderr, "filter: returns: %s\n", d->d_name);
return (1);
}
return (0);
}
static int cmp( const struct dirent **a, const struct dirent **b)
{
return strcmp((*a)->d_name, (*b)->d_name);
}
static void lsscan(char *pathpat, time_t s_lo, time_t s_hi, JsonNode *obj, int reverse)
{
struct dirent **namelist;
int i, n;
JsonNode *jarr = NULL;
static UT_string *path = NULL;
if (obj == NULL || obj->tag != JSON_OBJECT)
return;
utstring_renew(path);
/* Set global t_ values */
t_lo = s_lo;
t_hi = s_hi;
if ((n = scandir(pathpat, &namelist, filter_filename, cmp)) < 0) {
json_append_member(obj, "error", json_mkstring("Cannot lsscan requested directory"));
return;
}
/* If our obj contains the "results" array, use that
* and remove from obj; we'll add it back later.
*/
if ((jarr = json_find_member(obj, "results")) == NULL) {
jarr = json_mkarray();
} else {
json_delete(jarr);
}
if (reverse) {
for (i = n - 1; i >= 0; i--) {
utstring_clear(path);
utstring_printf(path, "%s/%s", pathpat, namelist[i]->d_name);
json_append_element(jarr, json_mkstring(UB(path)));
free(namelist[i]);
}
} else {
for (i = 0; i < n; i++) {
utstring_clear(path);
utstring_printf(path, "%s/%s", pathpat, namelist[i]->d_name);
json_append_element(jarr, json_mkstring(UB(path)));
free(namelist[i]);
}
}
free(namelist);
json_append_member(obj, "results", jarr);
}
/*
* If `user' and `device' are both NULL, return list of users.
* If `user` is specified, and device is NULL, return user's devices
* If both user and device are specified, return list of .rec files;
* in that case, limit with `s_lo` and `s_hi`. `reverse' is TRUE if
* list should be sorted in descending order.
*/
JsonNode *lister(char *user, char *device, time_t s_lo, time_t s_hi, int reverse)
{
JsonNode *json = json_mkobject();
static UT_string *path = NULL;
char *bp;
utstring_renew(path);
for (bp = user; bp && *bp; bp++) {
if (isupper(*bp))
*bp = tolower(*bp);
}
for (bp = device; bp && *bp; bp++) {
if (isupper(*bp))
*bp = tolower(*bp);
}
if (!user && !device) {
utstring_printf(path, "%s/rec", STORAGEDIR);
ls(UB(path), json);
} else if (!device) {
utstring_printf(path, "%s/rec/%s", STORAGEDIR, user);
ls(UB(path), json);
} else {
utstring_printf(path, "%s/rec/%s/%s",
STORAGEDIR, user, device);
lsscan(UB(path), s_lo, s_hi, json, reverse);
}
return (json);
}
/*
* List multiple user/device combinations. udpairs is a JSON
* array of strings, each of which is a user/device pair
* separated by a slash.
*/
JsonNode *multilister(JsonNode *udpairs, time_t s_lo, time_t s_hi, int reverse)
{
JsonNode *json = json_mkobject(), *ud;
static UT_string *path = NULL;
char *pairs[3];
int np;
if (udpairs == NULL || udpairs->tag != JSON_ARRAY) {
return (json);
}
json_foreach(ud, udpairs) {
if ((np = splitter(ud->string_, "/", pairs)) != 2) {
continue;
}
utstring_renew(path);
utstring_printf(path, "%s/rec/%s/%s",
STORAGEDIR,
pairs[0], /* user */
pairs[1]); /* device */
lsscan(UB(path), s_lo, s_hi, json, reverse);
splitterfree(pairs);
}
return (json);
}
struct jparam {
JsonNode *obj;
JsonNode *locs;
time_t s_lo;
time_t s_hi;
output_type otype;
int limit; /* if non-zero, we're searching backwards */
JsonNode *fields; /* If non-NULL array of fields names to return */
char *username; /* If non-NULL, add username to location */
char *device; /* If non-NULL, add device name to location */
};
/*
* line is a single valid '*' line from a .rec file. Turn it into a JSON object.
* objectorize it. Is that a word? :)
*/
static JsonNode *line_to_location(char *line)
{
JsonNode *json, *o, *j;
char *ghash;
char tstamp[64], *bp;
double lat, lon;
long tst;
int geoprec = geohash_prec();
snprintf(tstamp, 21, "%s", line);
if ((bp = strchr(line, '{')) == NULL)
return (NULL);
if ((json = json_decode(bp)) == NULL) {
return (NULL);
}
if ((j = json_find_member(json, "_type")) == NULL) {
json_delete(json);
return (NULL);
}
if (j->tag != JSON_STRING || strcmp(j->string_, "location") != 0) {
json_delete(json);
return (NULL);
}
o = json_mkobject();
if (json_copy_to_object(o, json, FALSE) == FALSE) {
json_delete(o);
json_delete(json);
return (NULL);
}
json_delete(json); /* Done with this -- we've copied it. */
lat = lon = 0.0;
if ((j = json_find_member(o, "lat")) != NULL) {
lat = j->number_;
}
if ((j = json_find_member(o, "lon")) != NULL) {
lon = j->number_;
}
if ((j = json_find_member(o, "_geoprec")) != NULL) {
geoprec = j->number_;
}
if ((ghash = geohash_encode(lat, lon, abs(geoprec))) != NULL) {
json_append_member(o, "ghash", json_mkstring(ghash));
get_geo(o, ghash);
free(ghash);
}
json_append_member(o, "isorcv", json_mkstring(tstamp));
tst = 0L;
if ((j = json_find_member(o, "tst")) != NULL) {
tst = j->number_;
}
json_append_member(o, "isotst", json_mkstring(isotime(tst)));
json_append_member(o, "disptst", json_mkstring(disptime(tst)));
return (o);
}
/*
* Invoked via tac() and cat(). Verify that line is indeed a location
* line from a .rec file. Then objectorize it and add to the locations
* JSON array and update the counter in our JSON object.
* Return 0 to tell caller to "ignore" the line, 1 to use it.
*/
static int candidate_line(char *line, void *param)
{
long counter = 0L;
JsonNode *j, *o;
struct jparam *jarg = (struct jparam*)param;
char *bp;
JsonNode *obj = jarg->obj;
JsonNode *locs = jarg->locs;
int limit = jarg->limit;
time_t s_lo = jarg->s_lo;
time_t s_hi = jarg->s_hi;
JsonNode *fields = jarg->fields;
output_type otype = jarg->otype;
char *username = jarg->username;
char *device = jarg->device;
if (obj == NULL || obj->tag != JSON_OBJECT)
return (-1);
if (locs == NULL || locs->tag != JSON_ARRAY)
return (-1);
if (limit == 0) {
/* Reading forwards; account for time */
char *p;
struct tm tmline;
time_t secs;
if ((p = strptime(line, "%Y-%m-%dT%H:%M:%SZ", &tmline)) == NULL) {
fprintf(stderr, "invalid strptime format on %s", line);
return (0);
}
tmline.tm_isdst = -1; /* A negative value for tm_isdst causes
* the mktime() function to attempt to
* divine whether summer time is in
* effect for the specified time. */
secs = mktime(&tmline);
if (secs <= s_lo || secs >= s_hi) {
return (0);
}
if (otype == RAW) {
printf("%s\n", line);
return (0);
} else if (otype == RAWPAYLOAD) {
char *bp;
if ((bp = strchr(line, '{')) != NULL) {
printf("%s\n", bp);
}
}
} else if (limit > 0 && otype == RAW) {
printf("%s\n", line);
return (1); /* make it 'count' or tac() will not decrement line counter and continue until EOF */
} else if (limit > 0) {
/* reading backwards; check time */
char *p;
struct tm tmline;
time_t secs;
if ((p = strptime(line, "%Y-%m-%dT%H:%M:%SZ", &tmline)) == NULL) {
fprintf(stderr, "invalid strptime format on %s", line);
return (0);
}
tmline.tm_isdst = -1;
secs = mktime(&tmline);
if (secs <= s_lo || secs >= s_hi) {
return (0);
}
}
/* Do we have location line? */
if ((bp = strstr(line, "Z\t* ")) == NULL) { /* Not a location line */
return (0);
}
if ((bp = strrchr(bp, '\t')) == NULL) {
return (0);
}
/* Initialize our counter to what the JSON obj currently has */
if ((j = json_find_member(obj, "count")) != NULL) {
counter = j->number_;
json_delete(j);
}
// fprintf(stderr, "-->[%s]\n", line);
if ((o = line_to_location(line)) != NULL) {
/*
* Username/device are added typically for multilister() only.
*/
if (username)
json_append_member(o, "username", json_mkstring(username));
if (device)
json_append_member(o, "device", json_mkstring(device));
if (fields) {
/* Create a new object, copying members we're interested in into it */
JsonNode *f, *node;
JsonNode *newo = json_mkobject();
json_foreach(f, fields) {
char *key = f->string_;
if ((node = json_find_member(o, key)) != NULL) {
json_copy_element_to_object(newo, key, node);
}
}
json_delete(o);
o = newo;
}
json_append_element(locs, o);
++counter;
}
/* Add the (possibly) incremented counter back into `obj' */
json_append_member(obj, "count", json_mknumber(counter));
return (1);
}
/*
* Read the file at `filename' (- is stdin) and store location
* objects at the JSON array `arr`. `obj' is a JSON object which
* contains `arr'.
* If limit is zero, we're going forward, else backwards.
* Fields, if not NULL, is a JSON array of desired element names.
*
* If username & device are not NULL, populate the JSON locations
* with them for multilister().
*/
void locations(char *filename, JsonNode *obj, JsonNode *arr, time_t s_lo, time_t s_hi, output_type otype, int limit, JsonNode *fields, char *username, char *device)
{
struct jparam jarg;
if (obj == NULL || obj->tag != JSON_OBJECT)
return;
jarg.obj = obj;
jarg.locs = arr;
jarg.s_lo = s_lo;
jarg.s_hi = s_hi;
jarg.otype = otype;
jarg.limit = limit;
jarg.fields = fields;
jarg.username = username;
jarg.device = device;
if (limit == 0) {
cat(filename, candidate_line, &jarg);
} else {
tac(filename, limit, candidate_line, &jarg);
}
}
/*
* We're being passed an array of location objects created in
* locations(). Produce a Geo JSON tree.
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": [-80.83775386582222,35.24980190252168]
},
"properties": {
"name": "DOUBLE OAKS CENTER",
"address": "1326 WOODWARD AV"
}
},
{
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": [-80.83827000459532,35.25674709224663]
},
"properties": {
"name": "DOUBLE OAKS NEIGHBORHOOD PARK",
"address": "2605 DOUBLE OAKS RD"
}
}
]
}
*
*/
static void append_to_feature_array(JsonNode *features, double lat, double lon, char *tid, char *addr, long tst, long vel, long acc)
{
JsonNode *geom, *props, *f = json_mkobject();
json_append_member(f, "type", json_mkstring("Feature"));
geom = json_mkobject();
json_append_member(geom, "type", json_mkstring("Point"));
JsonNode *coords = json_mkarray();
json_append_element(coords, json_mknumber(lon)); /* first LON! */
json_append_element(coords, json_mknumber(lat));
json_append_member(geom, "coordinates", coords);
props = json_mkobject();
json_append_member(props, "name", json_mkstring(tid));
json_append_member(props, "address", json_mkstring(addr));
json_append_member(props, "vel", json_mknumber(vel));
json_append_member(props, "tst", json_mknumber(tst));
json_append_member(props, "acc", json_mknumber(acc));
json_append_member(f, "geometry", geom);
json_append_member(f, "properties", props);
json_append_element(features, f);
}
JsonNode *geo_json(JsonNode *location_array)
{
JsonNode *one, *j;
JsonNode *feature_array, *fcollection;
if ((fcollection = json_mkobject()) == NULL)
return (NULL);
json_append_member(fcollection, "type", json_mkstring("FeatureCollection"));
feature_array = json_mkarray();
json_foreach(one, location_array) {
double lat = 0.0, lon = 0.0;
char *addr = "", *tid = "";
long tst = 0, vel = 0, acc = 0;
if ((j = json_find_member(one, "lat")) != NULL) {
lat = j->number_;
}
if ((j = json_find_member(one, "lon")) != NULL) {
lon = j->number_;
}
if ((j = json_find_member(one, "tid")) != NULL) {
tid = j->string_;
}
if ((j = json_find_member(one, "addr")) != NULL) {
addr = j->string_;
}
if ((j = json_find_member(one, "tst")) != NULL) {
tst = j->number_;
}
if ((j = json_find_member(one, "vel")) != NULL) {
vel = j->number_;
}
if ((j = json_find_member(one, "acc")) != NULL) {
acc = j->number_;
}
append_to_feature_array(feature_array, lat, lon, tid, addr, tst, vel, acc);
}
json_append_member(fcollection, "features", feature_array);
return (fcollection);
}
/*
* Create JSON suitable to represent this LineString:
*
* {
* "geometry": {
* "coordinates": [