Add error enum

Cargo.lock

@@ -179,6 +179,7 @@ dependencies = [
  "serde_json",
  "serde_repr",
  "strum_macros",
+ "thiserror",
  "time",
 ]
 
@@ -840,6 +841,26 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "thiserror"
+version = "1.0.56"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d54378c645627613241d077a3a79db965db602882668f9136ac42af9ecb730ad"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.56"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa0faa943b50f3db30a20aa7e265dbc66076993efed8463e8de414e5d06d3471"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "time"
 version = "0.3.32"

Cargo.toml

@@ -12,3 +12,4 @@ strum_macros = { version = "0.26.1"}
 time = { version = "0.3.32", features = ["serde", "serde-well-known"]}
 serde_json = "1.0.113"
 serde_repr = "0.1.18"
+thiserror = "1.0.56"

src/fronious.rs

@@ -1,6 +1,7 @@
 use serde::{de::DeserializeOwned, Deserialize, Serialize};
 use serde_repr::{Deserialize_repr, Serialize_repr};
 use std::net::IpAddr;
+use thiserror::Error;
 
 #[derive(Debug)]
 pub struct ValueError(String);
@@ -13,6 +14,20 @@ impl std::fmt::Display for ValueError {
 
 impl std::error::Error for ValueError {}
 
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error("unsupported API version {0}")]
+    UnsupportedApiVersion(u64),
+    #[error("invalid endpoint {0:?}")]
+    InvalidEndpoint(String),
+    #[error("request failed")]
+    Request(#[from] reqwest::Error),
+    #[error("decoding response body failed")]
+    Decode(#[from] serde_json::Error),
+    #[error("received error response {:?}: {}", .0.code, .0.reason)]
+    Response(Status),
+}
+
 #[derive(Debug, Serialize, Deserialize)]
 #[serde(rename_all = "PascalCase")]
 pub struct FroniousResponse<T> {