feat: config works

src/config.rs

@@ -0,0 +1,46 @@
+use std::collections::HashMap;
+use std::fs;
+
+use serde::Deserialize;
+use serde::Serialize;
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ProxyConfig {
+    pub prometheus: Option<bool>,
+    pub groups: Vec<ProxyGroup>,
+}
+
+impl ProxyConfig {
+    pub fn load(file_name: &str) -> Result<Self, String> {
+        let file_content = match fs::read_to_string(file_name) {
+            Ok(file_content) => file_content,
+            Err(e) => return Err(format!("read file: {} failed: {}", file_name, e)),
+        };
+        let proxy_config: ProxyConfig = match serde_json::from_str(&file_content) {
+            Ok(proxy_config) => proxy_config,
+            Err(e) => return Err(format!("parse file: {} failed: {}", file_name, e)),
+        };
+        Ok(proxy_config)
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ProxyGroup {
+    pub port: u16,
+    pub lookup_dns: Option<bool>,
+    pub tls: Option<ProxyTls>,
+    pub proxy_map: Option<HashMap<String, ProxyItem>>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ProxyItem {
+    pub address: String,
+    pub tls: Option<bool>,
+    pub sni: Option<String>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ProxyTls {
+    pub intermediate_cert: String,
+    pub intermediate_key: String,
+}