RUST-1060 Omit non-pub fields from debug output of ClientOptions (#512)

Author: patrickfreed

src/client/options/mod.rs

@@ -529,6 +529,7 @@ pub struct ClientOptions {
     pub default_database: Option<String>,
 
     #[builder(default, setter(skip))]
+    #[derivative(Debug = "ignore")]
     pub(crate) socket_timeout: Option<Duration>,
 
     /// The TLS configuration for the Client to use in its connections with the server.
@@ -545,9 +546,11 @@ pub struct ClientOptions {
     /// Information from the SRV URI that generated these client options, if applicable.
     #[builder(default, setter(skip))]
     #[serde(skip)]
+    #[derivative(Debug = "ignore")]
     pub(crate) original_srv_info: Option<OriginalSrvInfo>,
 
     #[builder(default, setter(skip))]
+    #[derivative(Debug = "ignore")]
     pub(crate) original_uri: Option<String>,
 
     /// Configuration of the trust-dns resolver used for SRV and TXT lookups.
@@ -557,6 +560,7 @@ pub struct ClientOptions {
     /// configuration, so a custom configuration is recommended.
     #[builder(default, setter(skip))]
     #[serde(skip)]
+    #[derivative(Debug = "ignore")]
     pub(crate) resolver_config: Option<ResolverConfig>,
 
     /// Control test behavior of the client.

src/client/options/test.rs

@@ -270,3 +270,15 @@ async fn parse_with_no_default_database() {
         }
     );
 }
+
+#[cfg_attr(feature = "tokio-runtime", tokio::test)]
+#[cfg_attr(feature = "async-std-runtime", async_std::test)]
+async fn options_debug_omits_uri() {
+    let uri = "mongodb://username:password@localhost/";
+    let options = ClientOptions::parse(uri).await.unwrap();
+
+    let debug_output = format!("{:?}", options);
+    assert!(!debug_output.contains("username"));
+    assert!(!debug_output.contains("password"));
+    assert!(!debug_output.contains("uri"));
+}