add subscriptions and example

solar_client/examples/subscriptions.rs

@@ -0,0 +1,27 @@
+use anyhow::Result;
+use solar_client::{Client, SolarClient};
+
+const SERVER_ADDR: &str = "http://127.0.0.1:3030";
+const PUB_KEY: &str = "@HEqy940T6uB+T+d9Jaa58aNfRzLx9eRWqkZljBmnkmk=.ed25519";
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    let client = Client::new(SERVER_ADDR.to_owned())?;
+
+    let subscriptions = client.subscriptions(PUB_KEY).await?;
+    println!("{:#?}", subscriptions);
+    // [
+    //     "falconry",
+    //     "solarfest",
+    //     "compendiumofmadscience",
+    //     "inktober2018",
+    //     "butt-summaries",
+    //     "squatchcam",
+    //     ...
+    //     "arduino",
+    //     "savingspools",
+    //     "meditation",
+    // ]
+
+    Ok(())
+}

solar_client/src/lib.rs

@@ -50,6 +50,8 @@ pub trait SolarClient {
 
     async fn subscribers(&self, channel: &str) -> Vec<String>;
 
+    async fn subscriptions(&self, pub_key: &str) -> Vec<String>;
+
     async fn whoami(&self) -> String;
 }