Streamline access/working with configured params and configured addr (#3219)

src/config.rs

@@ -1,6 +1,6 @@
 //! # Key-value configuration management.
 
-use anyhow::{ensure, Result};
+use anyhow::{ensure, Context as _, Result};
 use strum::{EnumProperty, IntoEnumIterator};
 use strum_macros::{AsRefStr, Display, EnumIter, EnumProperty, EnumString};
 
@@ -227,6 +227,12 @@ impl Context {
         Ok(self.get_config_int(key).await? != 0)
     }
 
+    pub(crate) async fn get_configured_addr(&self) -> Result<String> {
+        self.get_config(Config::ConfiguredAddr)
+            .await?
+            .context("no address configured")
+    }
+
     pub(crate) async fn should_watch_mvbox(&self) -> Result<bool> {
         Ok(self.get_config_bool(Config::MvboxMove).await?
             || self.get_config_bool(Config::OnlyFetchMvbox).await?)