Start work on connecting to RPC endpoint

Co-Authored-By: Antonio Scandurra <me@as-cii.com>

zed/src/util.rs

@@ -106,3 +106,33 @@ mod tests {
         assert_eq!(vec, &[1000, 101, 21, 19, 17, 13, 9, 8]);
     }
 }
+
+// Allow surf Results to accept context like other Results do when
+// using anyhow.
+pub trait SurfResultExt {
+    fn context<C>(self, cx: C) -> Self
+    where
+        C: std::fmt::Display + Send + Sync + 'static;
+
+    fn with_context<C, F>(self, f: F) -> Self
+    where
+        C: std::fmt::Display + Send + Sync + 'static,
+        F: FnOnce() -> C;
+}
+
+impl<T> SurfResultExt for surf::Result<T> {
+    fn context<C>(self, cx: C) -> Self
+    where
+        C: std::fmt::Display + Send + Sync + 'static,
+    {
+        self.map_err(|e| surf::Error::new(e.status(), e.into_inner().context(cx)))
+    }
+
+    fn with_context<C, F>(self, f: F) -> Self
+    where
+        C: std::fmt::Display + Send + Sync + 'static,
+        F: FnOnce() -> C,
+    {
+        self.map_err(|e| surf::Error::new(e.status(), e.into_inner().context(f())))
+    }
+}