Decomposing hot-path modules into focused submodules

Signed-off-by: Alexey <247128645+axkurcom@users.noreply.github.com>

src/config/types.rs

@@ -1687,6 +1687,14 @@ impl Default for TlsFetchConfig {
     }
 }
 
+#[derive(Debug, Clone)]
+pub struct ExclusiveMaskTarget {
+    /// Target host after IDNA/IP normalization.
+    pub host: String,
+    /// TCP port for the selected target.
+    pub port: u16,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct AntiCensorshipConfig {
     #[serde(default = "default_tls_domain")]
@@ -1722,6 +1730,10 @@ pub struct AntiCensorshipConfig {
     #[serde(default)]
     pub exclusive_mask: HashMap<String, String>,
 
+    /// Parsed runtime cache for per-SNI TCP mask targets.
+    #[serde(skip)]
+    pub exclusive_mask_targets: HashMap<String, ExclusiveMaskTarget>,
+
     #[serde(default)]
     pub mask_unix_sock: Option<String>,
 
@@ -1846,6 +1858,7 @@ impl Default for AntiCensorshipConfig {
             mask_host: None,
             mask_port: default_mask_port(),
             exclusive_mask: HashMap::new(),
+            exclusive_mask_targets: HashMap::new(),
             mask_unix_sock: None,
             fake_cert_len: default_fake_cert_len(),
             tls_emulation: true,