Remove dead_code annotations and add #[non_exhaustive] to public enums

All #[allow(dead_code)] annotations on now-used items have been removed
(acceptor.rs, acme.rs, config.rs, static_config.rs). #[non_exhaustive]
added to TlsMode, ProxyError, AdminSocketError, and ValidationError
with wildcard match arms in main.rs for the non-exhaustive enums.

src/tls/acceptor.rs

@@ -12,7 +12,6 @@ use crate::shutdown::GracefulShutdown;
 
 const ACME_TLS_ALPN_01: &[u8] = b"acme-tls/1";
 
-#[allow(dead_code)]
 fn build_acme_server_config(
     resolver: Arc<rustls_acme::ResolvesServerCertAcme>,
 ) -> Result<Arc<ServerConfig>> {
@@ -31,8 +30,8 @@ fn build_acme_server_config(
     Ok(Arc::new(config))
 }
 
-#[allow(dead_code)]
 #[derive(Debug)]
+#[non_exhaustive]
 pub enum TlsMode {
     Manual(Arc<ServerConfig>),
     Acme {
@@ -41,7 +40,6 @@ pub enum TlsMode {
     },
 }
 
-#[allow(dead_code)]
 pub fn setup_tls(tls_config: &TlsConfig, shutdown: Arc<GracefulShutdown>) -> Result<TlsMode> {
     match tls_config.mode.as_str() {
         "manual" => {

src/tls/acme.rs

@@ -8,13 +8,10 @@ use tracing::{error, info, warn};
 
 use crate::shutdown::GracefulShutdown;
 
-#[allow(dead_code)]
 const LETS_ENCRYPT_PRODUCTION_DIRECTORY: &str = "https://acme-v02.api.letsencrypt.org/directory";
-#[allow(dead_code)]
 const LETS_ENCRYPT_STAGING_DIRECTORY: &str =
     "https://acme-staging-v02.api.letsencrypt.org/directory";
 
-#[allow(dead_code)]
 pub struct AcmeTlsConfig {
     pub domains: Vec<String>,
     pub cache_dir: PathBuf,
@@ -22,7 +19,6 @@ pub struct AcmeTlsConfig {
     pub contact: Vec<String>,
 }
 
-#[allow(dead_code)]
 pub struct AcmeTlsSetup {
     pub resolver: Arc<ResolvesServerCertAcme>,
     pub state: AcmeState<std::io::Error, std::io::Error>,
@@ -54,7 +50,6 @@ impl AcmeTlsConfig {
         Ok(AcmeTlsSetup { resolver, state })
     }
 
-    #[allow(dead_code)]
     pub fn directory_url(&self) -> &str {
         match self.directory.as_str() {
             "production" => LETS_ENCRYPT_PRODUCTION_DIRECTORY,
@@ -64,7 +59,6 @@ impl AcmeTlsConfig {
     }
 }
 
-#[allow(dead_code)]
 pub fn spawn_acme_state(
     state: AcmeState<std::io::Error, std::io::Error>,
     domains: Vec<String>,

src/tls/config.rs

@@ -14,7 +14,6 @@ use rustls::ServerConfig;
 use rustls::SupportedCipherSuite;
 use rustls_pemfile;
 
-#[allow(dead_code)]
 static RESTRICTED_CIPHER_SUITES: &[SupportedCipherSuite] = &[
     cipher_suite::TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
     cipher_suite::TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,