make it work with Java

internal/pgproxy/pgproxy.go

@@ -92,24 +92,27 @@ func HandleConnection(ctx context.Context, conn net.Conn, connectionFn DSNConstr
 		logger.Infof("client disconnected without startup message: %s", conn.RemoteAddr())
 		return
 	}
-	logger.Debugf("startup message: %+v", startup)
-	logger.Debugf("backend connected: %s", conn.RemoteAddr())
+	logger.Infof("startup message: %+v", startup)
+	logger.Infof("backend connected: %s", conn.RemoteAddr())
 
-	frontend, err := connectFrontend(ctx, connectionFn, startup)
+	frontend, hijacked, err := connectFrontend(ctx, connectionFn, startup)
 	if err != nil {
 		// try again, in case there was a credential rotation
 		logger.Warnf("failed to connect frontend: %s, trying again", err)
 
-		frontend, err = connectFrontend(ctx, connectionFn, startup)
+		frontend, hijacked, err = connectFrontend(ctx, connectionFn, startup)
 		if err != nil {
 			handleBackendError(ctx, backend, err)
 			return
 		}
 	}
-	logger.Debugf("frontend connected")
-
 	backend.Send(&pgproto3.AuthenticationOk{})
-	backend.Send(&pgproto3.ReadyForQuery{})
+	logger.Infof("frontend connected")
+	for key, value := range hijacked.ParameterStatuses {
+		backend.Send(&pgproto3.ParameterStatus{Name: key, Value: value})
+	}
+
+	backend.Send(&pgproto3.ReadyForQuery{TxStatus: 'I'})
 	if err := backend.Flush(); err != nil {
 		logger.Errorf(err, "failed to flush backend authentication ok")
 		return
@@ -173,19 +176,19 @@ func connectBackend(ctx context.Context, conn net.Conn) (*pgproto3.Backend, *pgp
 	}
 }
 
-func connectFrontend(ctx context.Context, connectionFn DSNConstructor, startup *pgproto3.StartupMessage) (*pgproto3.Frontend, error) {
+func connectFrontend(ctx context.Context, connectionFn DSNConstructor, startup *pgproto3.StartupMessage) (*pgproto3.Frontend, *pgconn.HijackedConn, error) {
 	dsn, err := connectionFn(ctx, startup.Parameters)
 	if err != nil {
-		return nil, fmt.Errorf("failed to construct dsn: %w", err)
+		return nil, nil, fmt.Errorf("failed to construct dsn: %w", err)
 	}
 
 	conn, err := pgconn.Connect(ctx, dsn)
 	if err != nil {
-		return nil, fmt.Errorf("failed to connect to backend: %w", err)
+		return nil, nil, fmt.Errorf("failed to connect to backend: %w", err)
 	}
-	frontend := pgproto3.NewFrontend(conn.Conn(), conn.Conn())
-
-	return frontend, nil
+	hijacked, err := conn.Hijack()
+	frontend := hijacked.Frontend
+	return frontend, hijacked, nil
 }
 
 func proxy(ctx context.Context, backend *pgproto3.Backend, frontend *pgproto3.Frontend) error {
@@ -204,7 +207,7 @@ func proxy(ctx context.Context, backend *pgproto3.Backend, frontend *pgproto3.Fr
 				errors <- fmt.Errorf("failed to receive backend message: %w", err)
 				return
 			}
-			logger.Tracef("backend message: %T", msg)
+			logger.Infof("backend message: %T", msg)
 			frontend.Send(msg)
 			err = frontend.Flush()
 			if err != nil {
@@ -229,7 +232,7 @@ func proxy(ctx context.Context, backend *pgproto3.Backend, frontend *pgproto3.Fr
 				errors <- fmt.Errorf("failed to receive frontend message: %w", err)
 				return
 			}
-			logger.Tracef("frontend message: %T", msg)
+			logger.Infof("frontend message: %T", msg)
 			backend.Send(msg)
 			err = backend.Flush()
 			if err != nil {

jvm-runtime/ftl-runtime/common/deployment/src/main/java/xyz/block/ftl/deployment/DatasourceProcessor.java

@@ -9,10 +9,14 @@
 import io.quarkus.agroal.spi.JdbcDataSourceBuildItem;
 import io.quarkus.deployment.annotations.BuildProducer;
 import io.quarkus.deployment.annotations.BuildStep;
+import io.quarkus.deployment.annotations.ExecutionTime;
+import io.quarkus.deployment.annotations.Record;
 import io.quarkus.deployment.builditem.GeneratedResourceBuildItem;
 import io.quarkus.deployment.builditem.SystemPropertyBuildItem;
 import xyz.block.ftl.runtime.FTLDatasourceCredentials;
+import xyz.block.ftl.runtime.FTLRecorder;
 import xyz.block.ftl.runtime.config.FTLConfigSource;
+import xyz.block.ftl.v1.ModuleContextResponse;
 import xyz.block.ftl.v1.schema.Database;
 import xyz.block.ftl.v1.schema.Decl;
 
@@ -21,10 +25,12 @@ public class DatasourceProcessor {
     private static final Logger log = Logger.getLogger(DatasourceProcessor.class);
 
     @BuildStep
+    @Record(ExecutionTime.STATIC_INIT)
     public SchemaContributorBuildItem registerDatasources(
             List<JdbcDataSourceBuildItem> datasources,
             BuildProducer<SystemPropertyBuildItem> systemPropProducer,
-            BuildProducer<GeneratedResourceBuildItem> generatedResourceBuildItemBuildProducer) {
+            BuildProducer<GeneratedResourceBuildItem> generatedResourceBuildItemBuildProducer,
+            FTLRecorder recorder) {
         log.infof("Processing %d datasource annotations into decls", datasources.size());
         List<Decl> decls = new ArrayList<>();
         List<String> namedDatasources = new ArrayList<>();
@@ -37,6 +43,11 @@ public SchemaContributorBuildItem registerDatasources(
                 // FTL and quarkus use slightly different names
                 dbKind = "postgres";
             }
+            if (dbKind.equals("mysql")) {
+                recorder.registerDatabase(ds.getName(), ModuleContextResponse.DBType.MYSQL);
+            } else {
+                recorder.registerDatabase(ds.getName(), ModuleContextResponse.DBType.POSTGRES);
+            }
             //default name is <default> which is not a valid name
             String sanitisedName = ds.getName().replace("<", "").replace(">", "");
             //we use a dynamic credentials provider

jvm-runtime/ftl-runtime/common/runtime/src/main/java/xyz/block/ftl/runtime/FTLController.java

@@ -5,7 +5,9 @@
 import java.time.Duration;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Map;
 import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.regex.Pattern;
@@ -36,6 +38,8 @@ public class FTLController implements LeaseClient {
 
     private static volatile FTLController controller;
 
+    private final Map<String, ModuleContextResponse.DBType> databases = new ConcurrentHashMap<>();
+
     /**
      * TODO: look at how init should work, this is terrible and will break dev mode
      */
@@ -71,6 +75,10 @@ public static FTLController instance() {
         verbService = VerbServiceGrpc.newStub(channel);
     }
 
+    public void registerDatabase(String name, ModuleContextResponse.DBType type) {
+        databases.put(name, type);
+    }
+
     public byte[] getSecret(String secretName) {
         var context = getModuleContext();
         if (context.containsSecrets(secretName)) {
@@ -88,6 +96,10 @@ public byte[] getConfig(String secretName) {
     }
 
     public Datasource getDatasource(String name) {
+        if (databases.get(name) == ModuleContextResponse.DBType.POSTGRES) {
+            var proxyAddress = System.getenv("FTL_PROXY_POSTGRES_ADDRESS");
+            return new Datasource("jdbc:postgresql://" + proxyAddress + "/" + name, "ftl", "ftl");
+        }
         List<ModuleContextResponse.DSN> databasesList = getModuleContext().getDatabasesList();
         for (var i : databasesList) {
             if (i.getName().equals(name)) {

jvm-runtime/ftl-runtime/common/runtime/src/main/java/xyz/block/ftl/runtime/FTLRecorder.java

@@ -18,6 +18,7 @@
 import xyz.block.ftl.runtime.http.FTLHttpHandler;
 import xyz.block.ftl.runtime.http.HTTPVerbInvoker;
 import xyz.block.ftl.v1.CallRequest;
+import xyz.block.ftl.v1.ModuleContextResponse;
 
 @Recorder
 public class FTLRecorder {
@@ -171,4 +172,8 @@ public void run() {
             }
         });
     }
+
+    public void registerDatabase(String dbKind, ModuleContextResponse.DBType name) {
+        FTLController.instance().registerDatabase(dbKind, name);
+    }
 }