add subscribers and example

solar_client/examples/subscribers.rs

@@ -0,0 +1,18 @@
+use anyhow::Result;
+use solar_client::{Client, SolarClient};
+
+const SERVER_ADDR: &str = "http://127.0.0.1:3030";
+const CHANNEL: &str = "myco";
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    let client = Client::new(SERVER_ADDR.to_owned())?;
+
+    let subscribers = client.subscribers(CHANNEL).await?;
+    println!("{:#?}", subscribers);
+    // [
+    //     "@HEqy940T6uB+T+d9Jaa58aNfRzLx9eRWqkZljBmnkmk=.ed25519",
+    // ]
+
+    Ok(())
+}

solar_client/src/lib.rs

@@ -48,6 +48,8 @@ pub trait SolarClient {
 
     async fn ping(&self) -> String;
 
+    async fn subscribers(&self, channel: &str) -> Vec<String>;
+
     async fn whoami(&self) -> String;
 }