support creating client with configuration

rust/src/client.rs

@@ -115,6 +115,11 @@ impl Client {
         Self::with_config(&parsed_url, Configuration::new()?)
     }
 
+    pub fn new_with_config(url: &str, configuration: Configuration) -> Result<Self> {
+        let parsed_url = Url::parse(url)?;
+        Self::with_config(&parsed_url, configuration)
+    }
+
     fn with_config(url: &Url, config: Configuration) -> Result<Self> {
         if !url.has_host() {
             return Err(HdfsError::InvalidArgument(

rust/src/common/config.rs

@@ -21,6 +21,14 @@ pub struct Configuration {
     map: HashMap<String, String>,
 }
 
+impl From<HashMap<String, String>> for Configuration {
+    fn from(conf_map: HashMap<String, String>) -> Self {
+        Self {
+            map: conf_map,
+        }
+    }
+}
+
 impl Configuration {
     pub fn new() -> io::Result<Self> {
         let mut map: HashMap<String, String> = HashMap::new();