Adds option to log which parameter status is changed by the client (#550)

src/config.rs

@@ -547,6 +547,9 @@ pub struct Pool {
     #[serde(default = "Pool::default_cleanup_server_connections")]
     pub cleanup_server_connections: bool,
 
+    #[serde(default)] // False
+    pub log_client_parameter_status_changes: bool,
+
     pub plugins: Option<Plugins>,
     pub shards: BTreeMap<String, Shard>,
     pub users: BTreeMap<String, User>,
@@ -696,6 +699,7 @@ impl Default for Pool {
             server_lifetime: None,
             plugins: None,
             cleanup_server_connections: true,
+            log_client_parameter_status_changes: false,
         }
     }
 }
@@ -1157,6 +1161,10 @@ impl Config {
                 "[pool: {}] Cleanup server connections: {}",
                 pool_name, pool_config.cleanup_server_connections
             );
+            info!(
+                "[pool: {}] Log client parameter status changes: {}",
+                pool_name, pool_config.log_client_parameter_status_changes
+            );
             info!(
                 "[pool: {}] Plugins: {}",
                 pool_name,

src/mirrors.rs

@@ -41,6 +41,7 @@ impl MirroredClient {
             Arc::new(RwLock::new(None)),
             None,
             true,
+            false,
         );
 
         Pool::builder()

src/pool.rs

@@ -371,6 +371,7 @@ impl ConnectionPool {
                                 None => config.plugins.clone(),
                             },
                             pool_config.cleanup_server_connections,
+                            pool_config.log_client_parameter_status_changes,
                         );
 
                         let connect_timeout = match pool_config.connect_timeout {
@@ -956,6 +957,9 @@ pub struct ServerPool {
 
     /// Should we clean up dirty connections before putting them into the pool?
     cleanup_connections: bool,
+
+    /// Log client parameter status changes
+    log_client_parameter_status_changes: bool,
 }
 
 impl ServerPool {
@@ -967,6 +971,7 @@ impl ServerPool {
         auth_hash: Arc<RwLock<Option<String>>>,
         plugins: Option<Plugins>,
         cleanup_connections: bool,
+        log_client_parameter_status_changes: bool,
     ) -> ServerPool {
         ServerPool {
             address,
@@ -976,6 +981,7 @@ impl ServerPool {
             auth_hash,
             plugins,
             cleanup_connections,
+            log_client_parameter_status_changes,
         }
     }
 }
@@ -1005,6 +1011,7 @@ impl ManageConnection for ServerPool {
             stats.clone(),
             self.auth_hash.clone(),
             self.cleanup_connections,
+            self.log_client_parameter_status_changes,
         )
         .await
         {

src/server.rs

@@ -322,6 +322,9 @@ pub struct Server {
     /// Should clean up dirty connections?
     cleanup_connections: bool,
 
+    /// Log client parameter status changes
+    log_client_parameter_status_changes: bool,
+
     /// Prepared statements
     prepared_statements: BTreeSet<String>,
 }
@@ -337,6 +340,7 @@ impl Server {
         stats: Arc<ServerStats>,
         auth_hash: Arc<RwLock<Option<String>>>,
         cleanup_connections: bool,
+        log_client_parameter_status_changes: bool,
     ) -> Result<Server, Error> {
         let cached_resolver = CACHED_RESOLVER.load();
         let mut addr_set: Option<AddrSet> = None;
@@ -825,6 +829,7 @@ impl Server {
                             )),
                         },
                         cleanup_connections,
+                        log_client_parameter_status_changes,
                         prepared_statements: BTreeSet::new(),
                     };
 
@@ -1009,6 +1014,9 @@ impl Server {
 
                     if let Some(client_server_parameters) = client_server_parameters.as_mut() {
                         client_server_parameters.set_param(key.clone(), value.clone(), false);
+                        if self.log_client_parameter_status_changes {
+                            info!("Client parameter status change: {} = {}", key, value)
+                        }
                     }
 
                     self.server_parameters.set_param(key, value, false);
@@ -1382,6 +1390,7 @@ impl Server {
             Arc::new(ServerStats::default()),
             Arc::new(RwLock::new(None)),
             true,
+            false,
         )
         .await?;
         debug!("Connected!, sending query.");