feat(logger): use "/" as a delimiter between an actor's group and key

Closes #74

CHANGELOG.md

@@ -12,16 +12,19 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - core/envelope: add `Envelope::request_id()`.
 - core/config: impl `FromStr` for `Secret` ([#135]).
 - core/init: emit the `elfo_start_time_seconds` metric.
+- core/actor: implement `Display` for `ActorMeta` ([#74]).
 
 ### Changed
 - **BREAKING** core/node: remove `node` module, `NodeNo` is moved to `addr`.
+- logger: use `/` as a delimiter between an actor's group and key ([#74]).
 - core/addr: expose the `addr` module.
 - core: generate `NodeNo` randomly if not provided.
 - network: don't force `safe-*` features of lz4_flex ([#136]).
 
 ### Fixed
 - core: update the `idr-ebr` crate to v0.3 to fix possible crash in `Context::finished()`.
 
+[#74]: https://github.com/elfo-rs/elfo/issues/74
 [#135]: https://github.com/elfo-rs/elfo/pull/135
 [#136]: https://github.com/elfo-rs/elfo/pull/136
 

elfo-core/src/actor.rs

@@ -1,5 +1,5 @@
 use std::{
-    mem,
+    fmt, mem,
     sync::{atomic, Arc},
 };
 
@@ -29,10 +29,25 @@ use crate::{
 /// Represents meta information about actor: his group and key.
 #[derive(Debug, Hash, PartialEq, Eq, Serialize, Deserialize)]
 pub struct ActorMeta {
+    /// Actor's group name set in the topology.
     pub group: String,
+    /// Actor's key set by the router.
     pub key: String,
 }
 
+impl fmt::Display for ActorMeta {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str(&self.group)?;
+
+        if !self.key.is_empty() {
+            f.write_str("/")?;
+            f.write_str(&self.key)?;
+        }
+
+        Ok(())
+    }
+}
+
 // === ActorStartInfo ===
 
 /// A struct holding information related to an actor start.

elfo-logger/src/formatters.rs

@@ -86,12 +86,7 @@ impl Formatter<TraceId> for TraceId {
 
 impl Formatter<Arc<ActorMeta>> for Arc<ActorMeta> {
     fn fmt(out: &mut String, v: &Arc<ActorMeta>) {
-        out.push_str(&v.group);
-
-        if !v.key.is_empty() {
-            out.push('.');
-            out.push_str(&v.key);
-        }
+        let _ = write!(out, "{v}");
     }
 }