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use config::{Config, File, Environment};
use serde::{Serialize, Deserialize};
const CONFIG: &str = r#"
name = "foo"
[v4]
ca_path = "ca"
cert_path = "bar"
key_path = "baz"
"#;
#[derive(Debug, Deserialize, Clone)]
pub struct Settings {
pub name: String,
pub v4: TlsConfig,
}
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct TlsConfig {
pub ca_path: String,
#[serde(alias = "certpath")]
pub cert_path: String,
// #[serde(alias = "keypath")]
pub key_path: String,
}
#[test]
fn overwrite_key() {
std::env::set_var("V4_CERTPATH", "Hello World");
let s = Config::builder()
.add_source(File::from_str(CONFIG, config::FileFormat::Toml))
.add_source(Environment::default().separator("_"))
.build();
assert!(s.is_ok(), "build failed: {:?}", s);
let s = s.unwrap();
let v: Result<Settings, _> = s.try_deserialize();
// This is expected to error because the key `certpath` is specified by ENV and `cert_path`
// from the TOML.
// This should work, but does not because of the way this crate deserializes into T.
//
// The fix is to name the "TlsConfig::cert_path" field "TlsConfig::certpath".
assert!(v.is_err(), "accidentially ok: {:?}", v);
}
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