Add rust implementation

src/config.rs

@@ -0,0 +1,54 @@
+pub struct Config {
+    pub telegram_bot_api: reqwest::Url,
+
+    pub webhook_base_url: String,
+
+    pub manager_url: String,
+    pub manager_api_key: String,
+
+    pub user_settings_url: String,
+    pub user_settings_api_key: String,
+
+    pub book_server_url: String,
+    pub book_server_api_key: String,
+
+    pub cache_server_url: String,
+    pub cache_server_api_key: String,
+
+    pub sentry_dsn: String,
+}
+
+fn get_env(env: &'static str) -> String {
+    std::env::var(env).unwrap_or_else(|_| panic!("Cannot get the {} env variable", env))
+}
+
+impl Config {
+    pub fn load() -> Config {
+        Config {
+            telegram_bot_api: reqwest::Url::parse(&get_env("TELEGRAM_BOT_API_ROOT"))
+                .unwrap_or_else(|_| {
+                    panic!("Cannot parse url from TELEGRAM_BOT_API_ROOT env variable")
+                }),
+
+            webhook_base_url: get_env("WEBHOOK_BASE_URL"),
+
+            manager_url: get_env("MANAGER_URL"),
+            manager_api_key: get_env("MANAGER_API_KEY"),
+
+            user_settings_url: get_env("USER_SETTINGS_URL"),
+            user_settings_api_key: get_env("USER_SETTINGS_API_KEY"),
+
+            book_server_url: get_env("BOOK_SERVER_URL"),
+            book_server_api_key: get_env("BOOK_SERVER_API_KEY"),
+
+            cache_server_url: get_env("CACHE_SERVER_URL"),
+            cache_server_api_key: get_env("CACHE_SERVER_API_KEY"),
+
+            sentry_dsn: get_env("SENTRY_DSN"),
+        }
+    }
+}
+
+lazy_static! {
+    pub static ref CONFIG: Config = Config::load();
+}