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added additional JSON export encoded as GeoJSON #79

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added additional JSON export encoded as GeoJSON #79

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80 changes: 79 additions & 1 deletion net_io.c
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Original file line number Diff line number Diff line change
Expand Up @@ -694,6 +694,79 @@ char *aircraftsToJson(int *len) {
*len = p-buf;
return buf;
}
//
//=========================================================================
//
// Return a description of planes in json. No metric conversion
//
char *aircraftsToGeoJson(int *len) {
time_t now = time(NULL);
struct aircraft *a = Modes.aircrafts;
int buflen = 1024; // The initial buffer is incremented as needed
char *buf = (char *) malloc(buflen), *p = buf;
int l;

l = snprintf(p,buflen,"{ \"type\": \"FeatureCollection\", \"features\": [\n");
p += l; buflen -= l;
while(a) {
int position = 0;
int track = 0;

if (a->modeACflags & MODEAC_MSG_FLAG) { // skip any fudged ICAO records Mode A/C
a = a->next;
continue;
}

if (a->bFlags & MODES_ACFLAGS_LATLON_VALID) {
position = 1;
}

if (a->bFlags & MODES_ACFLAGS_HEADING_VALID) {
track = 1;
}

// No metric conversion
l = snprintf(p,buflen,
"{\"type\":\"Feature\", \"properties\": { \"hex\":\"%06x\", \"squawk\":\"%04x\", \"callsign\":\"%s\","
"\"validposition\":%d, \"altitude\":%d, \"vert_rate\":%d,\"track\":%d, \"validtrack\":%d,"
"\"speed\":%d, \"messages\":%ld, \"seen\":%d }, \"geometry\": { \"type\": \"Point\", \"coordinates\": [%f,%f]} },\n",
a->addr, a->modeA, a->flight, position, a->altitude, a->vert_rate, a->track, track,
a->speed, a->messages, (int)(now - a->seen), a->lon, a->lat);
/*
l = snprintf(p,buflen,
"{\"hex\":\"%06x\", \"squawk\":\"%04x\", \"flight\":\"%s\", \"lat\":%f, "
"\"lon\":%f, \"validposition\":%d, \"altitude\":%d, \"vert_rate\":%d,\"track\":%d, \"validtrack\":%d,"
"\"speed\":%d, \"messages\":%ld, \"seen\":%d},\n",
a->addr, a->modeA, a->flight, a->lat, a->lon, position, a->altitude, a->vert_rate, a->track, track,
a->speed, a->messages, (int)(now - a->seen));
*/
p += l; buflen -= l;

//Resize if needed
if (buflen < 256) {
int used = p-buf;
buflen += 1024; // Our increment.
buf = (char *) realloc(buf,used+buflen);
p = buf+used;
}

a = a->next;
}

//Remove the final comma if any, and closes the json array.
if (*(p-2) == ',') {
*(p-2) = '\n';
p--;
buflen++;
}

l = snprintf(p,buflen,"]}\n");
p += l; buflen -= l;

*len = p-buf;
return buf;
}

//
//=========================================================================
//
Expand Down Expand Up @@ -755,11 +828,16 @@ int handleHTTPRequest(struct client *c, char *p) {
// Select the content to send, we have just two so far:
// "/" -> Our google map application.
// "/data.json" -> Our ajax request to update planes.

if (strstr(url, "/data.json")) {
statuscode = 200;
content = aircraftsToJson(&clen);
//snprintf(ctype, sizeof ctype, MODES_CONTENT_TYPE_JSON);
} else {
} else if (strstr(url, "/geodata.json")) {
statuscode = 200;
content = aircraftsToGeoJson(&clen);
}
else {
struct stat sbuf;
int fd = -1;
char *rp, *hrp;
Expand Down