refactor: define crypto source trait

src/cert_file_reader.rs

@@ -1,4 +1,8 @@
-use crate::{certs::CertsAndKeys, log::*};
+use crate::{
+  certs::{CertsAndKeys, CryptoSource},
+  log::*,
+};
+use async_trait::async_trait;
 use rustls::{Certificate, PrivateKey};
 use std::{
   fs::File,
@@ -6,6 +10,26 @@ use std::{
   path::PathBuf,
 };
 
+/// Crypto-related file reader implementing certs::CryptoRead trait
+pub struct CryptoFileSource {
+  /// tls settings in file
+  pub tls_cert_path: PathBuf,
+  pub tls_cert_key_path: PathBuf,
+  pub client_ca_cert_path: Option<PathBuf>,
+}
+
+#[async_trait]
+impl CryptoSource for CryptoFileSource {
+  type Error = io::Error;
+  async fn read(&self) -> Result<CertsAndKeys, Self::Error> {
+    read_certs_and_keys(
+      &self.tls_cert_path,
+      &self.tls_cert_key_path,
+      self.client_ca_cert_path.as_ref(),
+    )
+  }
+}
+
 /// Read certificates and private keys from file
 pub(crate) fn read_certs_and_keys(
   cert_path: &PathBuf,

src/certs.rs

@@ -11,7 +11,7 @@ pub struct CertsAndKeys {
 
 #[async_trait]
 // Trait to read certs and keys anywhere from KVS, file, sqlite, etc.
-pub trait ReadCerts {
+pub trait CryptoSource {
   type Error;
-  async fn read_crypto_source(&self) -> Result<CertsAndKeys, Self::Error>;
+  async fn read(&self) -> Result<CertsAndKeys, Self::Error>;
 }