added missing file

node/libs/concurrency/src/error.rs

@@ -0,0 +1,19 @@
+//! Generalization of anyhow::Context to more structured errors.
+use std::fmt::Display;
+
+/// Trait complementary to anyhow::Context which allows for
+/// adding context to error types which contain anyhow::Error.
+pub trait Wrap: Sized {
+    /// Appends context `c` to the error.
+    fn wrap<C: Display + Send + Sync + 'static>(self, c: C) -> Self {
+        self.with_wrap(|| c)
+    }
+    /// Appends context `f()` to the error.
+    fn with_wrap<C: Display + Send + Sync + 'static, F: FnOnce() -> C>(self, f: F) -> Self;
+}
+
+impl<T, E: Wrap> Wrap for Result<T, E> {
+    fn with_wrap<C: Display + Send + Sync + 'static, F: FnOnce() -> C>(self, f: F) -> Self {
+        self.map_err(|err| err.with_wrap(f))
+    }
+}