HELP-68823 Fix invalid_me comparison and normalize host strings (mongodb#1319)

Author: abr-egn

src/client/options.rs

@@ -10,7 +10,7 @@ use std::{
     convert::TryFrom,
     fmt::{self, Display, Formatter, Write},
     hash::{Hash, Hasher},
-    net::Ipv6Addr,
+    net::{Ipv4Addr, Ipv6Addr},
     path::PathBuf,
     str::FromStr,
     sync::Arc,
@@ -272,6 +272,14 @@ impl ServerAddress {
             .into());
         }
 
+        let normalized_hostname = if let Ok(v4) = hostname.parse::<Ipv4Addr>() {
+            v4.to_string()
+        } else if let Ok(v6) = hostname.parse::<Ipv6Addr>() {
+            v6.to_string()
+        } else {
+            hostname.to_lowercase()
+        };
+
         let port = if let Some(port) = port {
             match u16::from_str(port) {
                 Ok(0) | Err(_) => {
@@ -291,7 +299,7 @@ impl ServerAddress {
         };
 
         Ok(Self::Tcp {
-            host: hostname.to_lowercase(),
+            host: normalized_hostname,
             port,
         })
     }

src/sdam/description/server.rs

@@ -334,7 +334,7 @@ impl ServerDescription {
     pub(crate) fn invalid_me(&self) -> Result<bool> {
         if let Some(ref reply) = self.reply.as_ref().map_err(Clone::clone)? {
             if let Some(ref me) = reply.command_response.me {
-                return Ok(&self.address.to_string() != me);
+                return Ok(self.address != ServerAddress::parse(me)?);
             }
         }
 

src/sdam/test.rs

@@ -349,3 +349,27 @@ async fn removed_server_monitor_stops() -> crate::error::Result<()> {
 
     Ok(())
 }
+
+#[test]
+fn ipv6_invalid_me() {
+    let addr = ServerAddress::Tcp {
+        host: "::1".to_string(),
+        port: Some(8191),
+    };
+    let desc = ServerDescription {
+        address: addr.clone(),
+        server_type: super::ServerType::RsSecondary,
+        last_update_time: None,
+        average_round_trip_time: None,
+        reply: Ok(Some(crate::hello::HelloReply {
+            server_address: addr.clone(),
+            command_response: crate::hello::HelloCommandResponse {
+                me: Some("[::1]:8191".to_string()),
+                ..Default::default()
+            },
+            raw_command_response: bson::RawDocumentBuf::new(),
+            cluster_time: None,
+        })),
+    };
+    assert!(!desc.invalid_me().unwrap());
+}