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|
use anyhow::anyhow;
use serde_json::Value;
const ZMQ_TIMEOUT : i64 = 2000;
pub struct DabMux {
ctx : zmq::Context,
rc_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()
}
}
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)
}
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 mut msg = zmq::Message::new();
let mut items = [
sock.as_poll_item(zmq::POLLIN),
];
zmq::poll(&mut items, ZMQ_TIMEOUT).unwrap();
if items[0].is_readable() {
sock.recv(&mut msg, 0)?;
let msg = msg.as_str().ok_or(anyhow!("RC response is not a str"))?;
// JSON structure:
// { "module1": { "param1": "value", "param2": "value" }, "module2": { ... } }
let v: Value = serde_json::from_str(msg)?;
Self::value_to_params(v)
}
else {
Err(anyhow!("Timeout reading RC"))
}
}
pub fn set_rc_parameter(&mut self, module: &str, param: &str, value: &str) -> anyhow::Result<Value> {
let sock = self.ctx.socket(zmq::REQ)?;
sock.connect(&self.rc_endpoint)?;
sock.send_multipart(["set", module, param, value], 0)?;
let mut items = [
sock.as_poll_item(zmq::POLLIN),
];
zmq::poll(&mut items, ZMQ_TIMEOUT).unwrap();
if items[0].is_readable() {
let mut parts = sock.recv_multipart(0)?;
let j : serde_json::Value = parts.drain(..)
.map(|p| match String::from_utf8(p)
{
Ok(s) => s,
Err(_) => "???".to_owned(),
})
.collect();
let j_arr = j.as_array().unwrap();
//eprintln!("SET_RC: {}", j);
if j_arr[0].as_str() == Some("ok") {
Ok(j)
}
else {
if j_arr.len() > 0 && j_arr[1].is_string() {
Err(anyhow!(format!("Failed to set RC: {}", j_arr[1].as_str().unwrap())))
}
else {
Err(anyhow!("Failed to set RC: unknown error"))
}
}
}
else {
Err(anyhow!("Timeout reading RC"))
}
}
}
|
