feat!: introduce explicit error handling (#3)

* feat: introduce explicit error handling

Ref n0-computer/iroh#2741

* chore: remove unused dependency

Author: dignifiedquire

Cargo.lock

@@ -27,7 +27,6 @@ unexpected_cfgs = { level = "warn", check-cfg = ["cfg(iroh_docsrs)"] }
 unused-async = "warn"
 
 [dependencies]
-anyhow = { version = "1" }
 erased_set = "0.8"
 http-body-util = "0.1.0"
 hyper = { version = "1", features = ["server", "http1"] }
@@ -37,7 +36,7 @@ prometheus-client = { version = "0.22", optional = true }
 reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }
 serde = { version = "1", features = ["derive"] }
 struct_iterable = "0.1"
-time = { version = "0.3.21", features = ["serde-well-known"] }
+thiserror = "2.0.6"
 tokio = { version = "1", features = ["rt", "net", "fs"]}
 tracing = "0.1"
 

Cargo.toml

@@ -177,10 +177,10 @@ impl Core {
     /// Encodes the current metrics registry to a string in
     /// the prometheus text exposition format.
     #[cfg(feature = "metrics")]
-    pub fn encode(&self) -> Result<String, std::fmt::Error> {
+    pub fn encode(&self) -> String {
         let mut buf = String::new();
-        encode(&mut buf, &self.registry)?;
-        Ok(buf)
+        encode(&mut buf, &self.registry).expect("writing to string always works");
+        buf
     }
 }