convert hand-written enum as_str matches to strum derives workspace-wide

swarm-queue-client/Cargo.toml

@@ -47,6 +47,7 @@ async-nats.workspace = true
 reqwest = { workspace = true, features = ["blocking"] }
 serde.workspace = true
 serde_json.workspace = true
+strum.workspace = true
 # A library, so its errors are a matchable enum rather than an opaque
 # `anyhow::Error`. The binaries that consume this keep anyhow; `?` converts.
 thiserror.workspace = true

swarm-queue-client/src/wanted.rs

@@ -84,8 +84,11 @@ pub struct AgentWanted {
 /// than part of a declaration it only half understands. Adding a state means
 /// adding a variant here and shipping it to both ends — which is the intended
 /// workflow, not an obstacle to route around with a catch-all variant.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
+#[derive(
+    Debug, Clone, Copy, PartialEq, Eq, serde::Serialize, serde::Deserialize, strum::IntoStaticStr,
+)]
 #[serde(rename_all = "snake_case")]
+#[strum(serialize_all = "snake_case")]
 pub enum AgentState {
     /// Exists on the hive and is running.
     Up,
@@ -112,16 +115,13 @@ pub enum AgentState {
 impl AgentState {
     /// The wire spelling, for a reader that renders rather than decodes.
     ///
-    /// Kept beside the enum so it cannot drift from the `rename_all` above;
-    /// a test pins the two together.
+    /// Derived (`#[strum(serialize_all = "snake_case")]`) from the same
+    /// convention as the `serde(rename_all)` above, rather than a
+    /// hand-written match kept in sync with it by hand; a test still pins
+    /// the two together.
     #[must_use]
     pub fn as_str(self) -> &'static str {
-        match self {
-            AgentState::Up => "up",
-            AgentState::Offline => "offline",
-            AgentState::Paused => "paused",
-            AgentState::Destroyed => "destroyed",
-        }
+        self.into()
     }
 }