RUST-1571 Update ServerId to be int64 (mongodb#894)

* RUST-1571 Update ServerId to be int64

Co-authored-by: Isabel Atkinson <[email protected]>

Author: drshika

src/cmap/conn/mod.rs

@@ -47,8 +47,15 @@ pub struct ConnectionInfo {
 
     /// A server-generated identifier that uniquely identifies the connection. Available on server
     /// versions 4.2+. This may be used to correlate driver connections with server logs.
+    /// If the connection ID sent by the server is too large for an i32, this will be a truncated
+    /// value.
     pub server_id: Option<i32>,
 
+    /// A server-generated identifier that uniquely identifies the connection. Available on server
+    /// versions 4.2+. This may be used to correlate driver connections with server logs. This
+    /// value will not be truncated and should be used rather than `server_id`.
+    pub server_id_i64: Option<i64>,
+
     /// The address that the connection is connected to.
     pub address: ServerAddress,
 }
@@ -60,7 +67,7 @@ pub(crate) struct Connection {
     /// Driver-generated ID for the connection.
     pub(super) id: u32,
     /// Server-generated ID for the connection.
-    pub(crate) server_id: Option<i32>,
+    pub(crate) server_id: Option<i64>,
 
     pub(crate) address: ServerAddress,
     pub(crate) generation: ConnectionGeneration,
@@ -165,7 +172,8 @@ impl Connection {
     pub(crate) fn info(&self) -> ConnectionInfo {
         ConnectionInfo {
             id: self.id,
-            server_id: self.server_id,
+            server_id: self.server_id.map(|value| value as i32),
+            server_id_i64: self.server_id,
             address: self.address.clone(),
         }
     }

src/hello.rs

@@ -179,7 +179,7 @@ pub(crate) struct HelloCommandResponse {
 
     /// The server-generated ID for the connection the "hello" command was run on.
     /// Present on server versions 4.2+.
-    pub connection_id: Option<i32>,
+    pub connection_id: Option<i64>,
 }
 
 impl HelloCommandResponse {