Pass application_name to server (#73)

* Pass application_name to server

* fmt

src/client.rs

@@ -342,6 +342,14 @@ impl Client {
                 server.address()
             );
 
+            // Set application_name if any.
+            // TODO: investigate other parameters and set them too.
+            if self.parameters.contains_key("application_name") {
+                server
+                    .set_name(&self.parameters["application_name"])
+                    .await?;
+            }
+
             // Transaction loop. Multiple queries can be issued by the client here.
             // The connection belongs to the client until the transaction is over,
             // or until the client disconnects if we are in session mode.

tests/ruby/tests.rb

@@ -16,6 +16,7 @@ ActiveRecord::Base.establish_connection(
   username: 'sharding_user',
   password: 'sharding_user',
   database: 'rails_dev',
+  application_name: 'testing_pgcat',
   prepared_statements: false, # Transaction mode
   advisory_locks: false # Same
 )
@@ -116,7 +117,7 @@ end
 
 # Test evil clients
 def poorly_behaved_client
-  conn = PG::connect("postgres://sharding_user:sharding_user@127.0.0.1:6432/rails_dev")
+  conn = PG::connect("postgres://sharding_user:sharding_user@127.0.0.1:6432/rails_dev?application_name=testing_pgcat")
   conn.async_exec 'BEGIN'
   conn.async_exec 'SELECT 1'