use ssdp::FieldMap;
use ssdp::header::{HeaderMut, HeaderRef, Man, MX, ST};
use ssdp::message::{Multicast, SearchRequest, SearchResponse};
use failure::{Error, SyncFailure};
use crate::device::Speaker;
use crate::error::*;
const SONOS_URN: &str = "schemas-upnp-org:device:ZonePlayer:1";
fn get_header(msg: &SearchResponse, header: &str) -> Result<String, Error> {
let bytes = msg.get_raw(header).ok_or_else(|| SonosError::ParseError("failed to find header"))?;
Ok(String::from_utf8(bytes[0].clone())?)
}
pub fn discover() -> Result<Vec<Speaker>, Error> {
let mut request = SearchRequest::new();
request.set(Man);
request.set(MX(2));
request.set(ST::Target(FieldMap::URN(String::from(SONOS_URN))));
let mut speakers = Vec::new();
for (msg, src) in request.multicast().map_err(SyncFailure::new)? {
let usn = get_header(&msg, "USN")?;
if !usn.contains(SONOS_URN) {
error!("Misbehaving client responded to our discovery ({})", usn);
continue;
}
speakers.push(Speaker::from_ip(src.ip())?);
}
Ok(speakers)
}