Arrow Flight SQL example JDBC driver incompatibility

arrow-flight/examples/flight_sql_server.rs

@@ -24,7 +24,9 @@ use once_cell::sync::Lazy;
 use prost::Message;
 use std::collections::HashSet;
 use std::pin::Pin;
+use std::str::FromStr;
 use std::sync::Arc;
+use tonic::metadata::MetadataValue;
 use tonic::transport::Server;
 use tonic::transport::{Certificate, Identity, ServerTlsConfig};
 use tonic::{Request, Response, Status, Streaming};
@@ -184,7 +186,15 @@ impl FlightSqlService for FlightSqlServiceImpl {
         };
         let result = Ok(result);
         let output = futures::stream::iter(vec![result]);
-        return Ok(Response::new(Box::pin(output)));
+
+        let token = format!("Bearer {}", FAKE_TOKEN);
+        let mut response: Response<Pin<Box<dyn Stream<Item = _> + Send>>> =
+            Response::new(Box::pin(output));
+        response.metadata_mut().append(
+            "authorization",
+            MetadataValue::from_str(token.as_str()).unwrap(),
+        );
+        return Ok(response);
     }
 
     async fn do_get_fallback(
@@ -235,21 +245,20 @@ impl FlightSqlService for FlightSqlServiceImpl {
         self.check_token(&request)?;
         let handle = std::str::from_utf8(&cmd.prepared_statement_handle)
             .map_err(|e| status!("Unable to parse handle", e))?;
+
         let batch = Self::fake_result().map_err(|e| status!("Could not fake a result", e))?;
         let schema = (*batch.schema()).clone();
         let num_rows = batch.num_rows();
         let num_bytes = batch.get_array_memory_size();
-        let loc = Location {
-            uri: "grpc+tcp://127.0.0.1".to_string(),
-        };
+
         let fetch = FetchResults {
             handle: handle.to_string(),
         };
         let buf = fetch.as_any().encode_to_vec().into();
         let ticket = Ticket { ticket: buf };
         let endpoint = FlightEndpoint {
             ticket: Some(ticket),
-            location: vec![loc],
+            location: vec![],
             expiration_time: None,
             app_metadata: vec![].into(),
         };
@@ -662,9 +671,7 @@ impl FlightSqlService for FlightSqlServiceImpl {
         _query: ActionClosePreparedStatementRequest,
         _request: Request<Action>,
     ) -> Result<(), Status> {
-        Err(Status::unimplemented(
-            "Implement do_action_close_prepared_statement",
-        ))
+        Ok(())
     }
 
     async fn do_action_create_prepared_substrait_plan(
@@ -725,9 +732,8 @@ impl FlightSqlService for FlightSqlServiceImpl {
 /// This example shows how to run a FlightSql server
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let addr = "0.0.0.0:50051".parse()?;
-
-    let svc = FlightServiceServer::new(FlightSqlServiceImpl {});
+    let addr_str = "127.0.0.1:50051";
+    let addr = addr_str.parse()?;
 
     println!("Listening on {:?}", addr);
 
@@ -736,6 +742,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         let key = std::fs::read_to_string("arrow-flight/examples/data/server.key")?;
         let client_ca = std::fs::read_to_string("arrow-flight/examples/data/client_ca.pem")?;
 
+        let svc = FlightServiceServer::new(FlightSqlServiceImpl {});
         let tls_config = ServerTlsConfig::new()
             .identity(Identity::from_pem(&cert, &key))
             .client_ca_root(Certificate::from_pem(&client_ca));
@@ -746,6 +753,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
             .serve(addr)
             .await?;
     } else {
+        let svc = FlightServiceServer::new(FlightSqlServiceImpl {});
+
         Server::builder().add_service(svc).serve(addr).await?;
     }
 
@@ -999,15 +1008,6 @@ mod tests {
                 .to_string()
                 .contains("Invalid credentials"));
 
-            // forget to set_token
-            client.handshake("admin", "password").await.unwrap();
-            assert!(client
-                .prepare("select 1;".to_string(), None)
-                .await
-                .unwrap_err()
-                .to_string()
-                .contains("No authorization header"));
-
             // Invalid Tokens
             client.handshake("admin", "password").await.unwrap();
             client.set_token("wrong token".to_string());
@@ -1017,6 +1017,12 @@ mod tests {
                 .unwrap_err()
                 .to_string()
                 .contains("invalid token"));
+
+            client.clear_token();
+
+            // Successful call (token is automatically set by handshake)
+            client.handshake("admin", "password").await.unwrap();
+            client.prepare("select 1;".to_string(), None).await.unwrap();
         })
         .await
     }

arrow-flight/src/sql/client.rs

@@ -97,6 +97,11 @@ impl FlightSqlServiceClient<Channel> {
         self.token = Some(token);
     }
 
+    /// Clear the auth token.
+    pub fn clear_token(&mut self) {
+        self.token = None;
+    }
+
     /// Set header value.
     pub fn set_header(&mut self, key: impl Into<String>, value: impl Into<String>) {
         let key: String = key.into();