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use std::collections::HashMap;
use anyhow::anyhow;
use serde::Deserialize;
use serde_json::Value;
use log::info;
const ZMQ_TIMEOUT : i64 = 2000;
pub struct DabMux {
ctx : zmq::Context,
rc_endpoint : String,
stats_endpoint : String,
}
pub struct Param {
pub module : String,
pub param : String,
pub value : String,
}
impl DabMux {
pub fn new() -> Self {
let ctx = zmq::Context::new();
Self {
ctx,
rc_endpoint : "tcp://127.0.0.1:12722".to_owned(),
stats_endpoint : "tcp://127.0.0.1:12720".to_owned(),
}
}
fn value_to_params(v: Value) -> anyhow::Result<Vec<Param>> {
let root = v.as_object().ok_or(anyhow!("RC data is not a JSON object"))?;
let mut all_params = Vec::new();
for (module_name, params_value) in root {
let params = params_value.as_object().ok_or(anyhow!("RC module {} is not a JSON object", module_name))?;
// ODR-DabMux doesn't allow setting only label through the RC, so we have to merge them together
if let (Some(Value::String(l)), Some(Value::String(sl))) = (params.get("label").clone(), params.get("shortlabel").clone()) {
let value = format!("{},{}", l, sl);
all_params.push(
Param {
module: module_name.to_owned(),
param: "label".to_owned(),
value
});
}
for (param_name, value_json) in params {
if !(param_name == "label" || param_name == "shortlabel") {
let value = match value_json {
Value::Null => "null".to_owned(),
Value::Bool(b) => if *b { "1".to_owned() } else { "0".to_owned() },
Value::Number(n) => n.to_string(),
Value::String(s) => s.clone(),
Value::Array(_) => return Err(anyhow!(format!("Unexpected array in {}.{}", module_name, param_name))),
Value::Object(_) => return Err(anyhow!(format!("Unexpected object in {}.{}", module_name, param_name))),
};
all_params.push(
Param {
module: module_name.to_owned(),
param: param_name.to_owned(),
value
});
}
}
}
Ok(all_params)
}
fn poll_multipart(sock: &zmq::Socket) -> anyhow::Result<Vec<String>> {
let mut items = [ sock.as_poll_item(zmq::POLLIN), ];
zmq::poll(&mut items, ZMQ_TIMEOUT).unwrap();
if items[0].is_readable() {
let mut parts = Vec::new();
for part in sock.recv_multipart(0)? {
let p = String::from_utf8(part)?;
parts.push(p);
}
Ok(parts)
}
else {
Err(anyhow!("ZMQ timeout"))
}
}
fn poll_message(sock: &zmq::Socket) -> anyhow::Result<String> {
let parts = Self::poll_multipart(&sock)?;
if parts.len() == 1 {
Ok(parts[0].clone())
}
else {
info!("multipart returned: {}", parts.join(","));
return Err(anyhow!("unexpected multipart answer"));
}
}
pub fn get_rc_parameters(&mut self) -> anyhow::Result<Vec<Param>> {
let sock = self.ctx.socket(zmq::REQ)?;
sock.connect(&self.rc_endpoint)?;
sock.send("showjson", 0)?;
let msg = Self::poll_message(&sock)?;
// JSON structure:
// { "module1": { "param1": "value", "param2": "value" }, "module2": { ... } }
let v: Value = serde_json::from_str(&msg)?;
Self::value_to_params(v)
}
pub fn set_rc_parameter(&mut self, module: &str, param: &str, value: &str) -> anyhow::Result<()> {
let sock = self.ctx.socket(zmq::REQ)?;
sock.connect(&self.rc_endpoint)?;
sock.send_multipart(["set", module, param, value], 0)?;
let resp = Self::poll_multipart(&sock)?;
//eprintln!("SET_RC: {}", j);
if resp.len() > 0 && resp[0] == "ok" {
Ok(())
}
else {
if resp.len() > 1 && resp[0] == "fail" {
Err(anyhow!(format!("Failed to set RC: {}", resp[1])))
}
else {
Err(anyhow!("Failed to set RC: unknown error"))
}
}
}
pub fn get_stats(&mut self) -> anyhow::Result<Stats> {
let sock = self.ctx.socket(zmq::REQ)?;
sock.connect(&self.stats_endpoint)?;
sock.send("info", 0)?;
let info_json : Value = serde_json::from_str(&Self::poll_message(&sock)?)?;
if let Some(service) = info_json.get("service")
.and_then(|v| v.as_str())
{
if !service.starts_with("ODR-DabMux") {
info!("stats info service is {}", service);
return Err(anyhow!("Wrong service in stats"));
}
let version = info_json.get("version")
.and_then(|v| v.as_str())
.or(Some("UNKNOWN"))
.unwrap()
.to_owned();
sock.send("values", 0)?;
let values_json : Value = serde_json::from_str(&Self::poll_message(&sock)?)?;
match values_json.get("values")
.and_then(|v| v.as_object()) {
Some(v) => {
let mut input_stats : HashMap<String, InputStat> = HashMap::new();
for (k, v) in v {
let is = v.get("inputstat")
.ok_or(anyhow!("inputstat missing"))?;
let stat : InputStat = serde_json::from_value(is.clone())?;
input_stats.insert(k.clone(), stat);
}
Ok(Stats { version, input_stats })
},
None => Err(anyhow!("values isn't an object")),
}
}
else {
Err(anyhow!("Missing service in stats response"))
}
}
}
#[derive(Debug)]
pub struct Stats {
pub version : String,
pub input_stats : HashMap<String, InputStat>,
}
#[derive(Debug, Deserialize)]
pub struct InputStat {
pub max_fill : u32,
pub min_fill : u32,
pub num_underruns : u64,
pub num_overruns : u64,
pub peak_left : i32,
pub peak_right : i32,
pub peak_left_slow : i32,
pub peak_right_slow : i32,
pub state : Option<String>,
pub version : Option<String>,
pub uptime : Option<u64>,
pub last_tist_offset : i32,
}
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