io.lettuce.core.RedisCommandExecutionException: NOAUTH Authentication…

… required on CLIENT and READONLY command

Using custom credentials provider can delay providing of credentials. In this case applyPostHandshake and applyConnectionMetadata got executed before handshake and lead to NOAUTH error in the log for CLIENT command.

pom.xml

@@ -45,6 +45,7 @@
     </developers>
 
     <properties>
+        <awaitility.version>4.2.2</awaitility.version>
         <assertj-core.version>3.25.3</assertj-core.version>
         <cdi-api.version>2.0.SP1</cdi-api.version>
         <brave.version>5.13.11</brave.version>
@@ -103,7 +104,12 @@
 
     <dependencyManagement>
         <dependencies>
-
+            <dependency>
+                <groupId>org.awaitility</groupId>
+                <artifactId>awaitility</artifactId>
+                <version>${awaitility.version}</version>
+                <scope>test</scope>
+            </dependency>
             <dependency>
                 <groupId>io.netty</groupId>
                 <artifactId>netty-bom</artifactId>
@@ -327,6 +333,12 @@
             <scope>test</scope>
         </dependency>
 
+        <dependency>
+            <groupId>org.awaitility</groupId>
+            <artifactId>awaitility</artifactId>
+            <scope>test</scope>
+        </dependency>
+
         <dependency>
             <groupId>org.hdrhistogram</groupId>
             <artifactId>HdrHistogram</artifactId>

src/main/java/io/lettuce/core/RedisHandshake.java

@@ -101,21 +101,14 @@ public CompletionStage<Void> initialize(Channel channel) {
                     new RedisConnectionException("Protocol version" + this.requestedProtocolVersion + " not supported"));
         }
 
-        // post-handshake commands, whose execution failures would cause the connection to be considered
-        // unsuccessfully established
-        CompletableFuture<Void> postHandshake = applyPostHandshake(channel);
-
-        // post-handshake commands, executed in a 'fire and forget' manner, to avoid having to react to different
-        // implementations or versions of the server runtime, and whose execution result (whether a success or a
-        // failure ) should not alter the outcome of the connection attempt
-        CompletableFuture<Void> connectionMetadata = applyConnectionMetadata(channel).handle((result, error) -> {
-            if (error != null) {
-                LOG.debug("Error applying connection metadata", error);
-            }
-            return null;
-        });
-
-        return handshake.thenCompose(ignore -> postHandshake).thenCompose(ignore -> connectionMetadata);
+        return handshake
+                // post-handshake commands, whose execution failures would cause the connection to be considered
+                // unsuccessfully established
+                .thenCompose(ignore -> applyPostHandshake(channel))
+                // post-handshake commands, executed in a 'fire and forget' manner, to avoid having to react to different
+                // implementations or versions of the server runtime, and whose execution result (whether a success or a
+                // failure ) should not alter the outcome of the connection attempt
+                .thenCompose(ignore -> applyConnectionMetadataSafely(channel));
     }
 
     private CompletionStage<?> tryHandshakeResp3(Channel channel) {
@@ -271,6 +264,15 @@ private CompletableFuture<Void> applyPostHandshake(Channel channel) {
         return dispatch(channel, postHandshake);
     }
 
+    private CompletionStage<Void> applyConnectionMetadataSafely(Channel channel) {
+        return applyConnectionMetadata(channel).handle((result, error) -> {
+            if (error != null) {
+                LOG.debug("Error applying connection metadata", error);
+            }
+            return null;
+        });
+    }
+
     private CompletableFuture<Void> applyConnectionMetadata(Channel channel) {
 
         List<AsyncCommand<?, ?, ?>> postHandshake = new ArrayList<>();

src/test/java/io/lettuce/core/RedisHandshakeUnitTests.java

@@ -1,20 +1,24 @@
 package io.lettuce.core;
 
 import static io.lettuce.TestTags.UNIT_TEST;
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static org.assertj.core.api.Assertions.*;
 
 import java.nio.ByteBuffer;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.CompletionStage;
 
+import org.awaitility.Awaitility;
 import org.junit.jupiter.api.Tag;
 import org.junit.jupiter.api.Test;
 
 import io.lettuce.core.output.CommandOutput;
 import io.lettuce.core.protocol.AsyncCommand;
 import io.lettuce.core.protocol.ProtocolVersion;
 import io.netty.channel.embedded.EmbeddedChannel;
+import reactor.core.publisher.Mono;
+import reactor.core.publisher.Sinks;
 
 /**
  * Unit tests for {@link RedisHandshake}.
@@ -106,6 +110,42 @@ void handshakeFireAndForgetPostHandshake() {
         assertThat(handshakeInit.toCompletableFuture().isCompletedExceptionally()).isFalse();
     }
 
+    @Test
+    void handshakeDelayedCredentialProvider() {
+
+        DelayedRedisCredentialsProvider cp = new DelayedRedisCredentialsProvider();
+        // RedisCredentialsProvider cp = () -> Mono.just(RedisCredentials.just("foo",
+        // "bar")).delayElement(Duration.ofMillis(3));
+        EmbeddedChannel channel = new EmbeddedChannel(true, false);
+
+        ConnectionMetadata connectionMetdata = new ConnectionMetadata();
+        connectionMetdata.setLibraryName("library-name");
+        connectionMetdata.setLibraryVersion("library-version");
+
+        ConnectionState state = new ConnectionState();
+        state.setCredentialsProvider(cp);
+        state.apply(connectionMetdata);
+        RedisHandshake handshake = new RedisHandshake(null, false, state);
+        CompletionStage<Void> handshakeInit = handshake.initialize(channel);
+        cp.completeCredentials(RedisCredentials.just("foo", "bar"));
+
+        Awaitility.await().atMost(50, MILLISECONDS) // Wait up to 5 seconds
+                .pollInterval(5, MILLISECONDS) // Poll every 50 milliseconds
+                .until(() -> !channel.outboundMessages().isEmpty());
+
+        AsyncCommand<String, String, Map<String, String>> hello = channel.readOutbound();
+        helloResponse(hello.getOutput());
+        hello.complete();
+
+        List<AsyncCommand<String, String, Map<String, String>>> postHandshake = channel.readOutbound();
+        postHandshake.get(0).getOutput().setError(ERR_UNKNOWN_COMMAND);
+        postHandshake.get(0).completeExceptionally(new RedisException(ERR_UNKNOWN_COMMAND));
+        postHandshake.get(0).complete();
+
+        assertThat(postHandshake.size()).isEqualTo(2);
+        assertThat(handshakeInit.toCompletableFuture().isCompletedExceptionally()).isFalse();
+    }
+
     @Test
     void shouldParseVersionWithCharacters() {
 
@@ -136,4 +176,19 @@ private static void helloResponse(CommandOutput<String, String, Map<String, Stri
         output.set(ByteBuffer.wrap("1.2.3".getBytes()));
     }
 
+    static class DelayedRedisCredentialsProvider implements RedisCredentialsProvider {
+
+        private final Sinks.One<RedisCredentials> credentialsSink = Sinks.one();
+
+        @Override
+        public Mono<RedisCredentials> resolveCredentials() {
+            return credentialsSink.asMono();
+        }
+
+        public void completeCredentials(RedisCredentials credentials) {
+            credentialsSink.tryEmitValue(credentials);
+        }
+
+    }
+
 }