[SCB-1955] create unify producer invocation flow

core/src/main/java/org/apache/servicecomb/core/filter/FilterNode.java

@@ -26,6 +26,13 @@
 import org.apache.servicecomb.swagger.invocation.Response;
 
 public class FilterNode {
+  public static final FilterNode EMPTY = new FilterNode(null) {
+    @Override
+    public CompletableFuture<Response> onFilter(Invocation invocation1) {
+      return CompletableFuture.completedFuture(Response.ok(null));
+    }
+  };
+
   public static FilterNode buildChain(Filter... filters) {
     return buildChain(Arrays.asList(filters));
   }

core/src/main/java/org/apache/servicecomb/core/invocation/InvocationCreator.java

@@ -0,0 +1,26 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.servicecomb.core.invocation;
+
+import org.apache.servicecomb.core.Invocation;
+
+/**
+ * better to named InvocationFactory, but already be used by old version
+ */
+public interface InvocationCreator {
+  Invocation create();
+}

core/src/main/java/org/apache/servicecomb/core/invocation/ProducerInvocationFlow.java

@@ -0,0 +1,93 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.servicecomb.core.invocation;
+
+import java.util.concurrent.CompletableFuture;
+
+import org.apache.servicecomb.core.Invocation;
+import org.apache.servicecomb.core.exception.Exceptions;
+import org.apache.servicecomb.core.filter.FilterNode;
+import org.apache.servicecomb.foundation.vertx.http.HttpServletRequestEx;
+import org.apache.servicecomb.foundation.vertx.http.HttpServletResponseEx;
+import org.apache.servicecomb.swagger.invocation.Response;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public abstract class ProducerInvocationFlow {
+  private static final Logger LOGGER = LoggerFactory.getLogger(ProducerInvocationFlow.class);
+
+  private final long startTime = System.nanoTime();
+
+  private final InvocationCreator invocationCreator;
+
+  protected final HttpServletRequestEx requestEx;
+
+  protected final HttpServletResponseEx responseEx;
+
+  public ProducerInvocationFlow(InvocationCreator invocationCreator) {
+    this(invocationCreator, null, null);
+  }
+
+  public ProducerInvocationFlow(InvocationCreator invocationCreator,
+      HttpServletRequestEx requestEx, HttpServletResponseEx responseEx) {
+    this.invocationCreator = invocationCreator;
+    this.requestEx = requestEx;
+    this.responseEx = responseEx;
+  }
+
+  public void run() {
+    CompletableFuture.completedFuture(null)
+        .thenApply(v -> invocationCreator.create())
+        .exceptionally(this::sendCreateInvocationException)
+        .thenAccept(this::tryRunInvocation);
+  }
+
+  private void tryRunInvocation(Invocation invocation) {
+    if (invocation == null) {
+      return;
+    }
+
+    invocation.onStart(requestEx, startTime);
+    getOrCreateFilterChain(invocation)
+        .onFilter(invocation)
+        .whenComplete((response, Throwable) -> sendResponse(invocation, response))
+        .whenComplete((response, Throwable) -> finishInvocation(invocation, response, Throwable));
+  }
+
+  private void finishInvocation(Invocation invocation, Response response, Throwable throwable) {
+    invocation.onFinish(response);
+
+    if (throwable == null) {
+      return;
+    }
+
+    throwable = Exceptions.unwrap(throwable);
+    if (requestEx == null) {
+      LOGGER.error("Failed to finish invocation, operation:{}", invocation.getMicroserviceQualifiedName(), throwable);
+      return;
+    }
+
+    LOGGER.error("Failed to finish invocation, operation:{}, request uri:{}",
+        invocation.getMicroserviceQualifiedName(), requestEx.getRequestURI(), throwable);
+  }
+
+  protected abstract FilterNode getOrCreateFilterChain(Invocation invocation);
+
+  protected abstract Invocation sendCreateInvocationException(Throwable throwable);
+
+  protected abstract void sendResponse(Invocation invocation, Response response);
+}

core/src/test/java/org/apache/servicecomb/core/invocation/ProducerInvocationFlowTest.java

@@ -0,0 +1,147 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.servicecomb.core.invocation;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.concurrent.atomic.AtomicLong;
+
+import org.apache.servicecomb.core.Invocation;
+import org.apache.servicecomb.core.exception.Exceptions;
+import org.apache.servicecomb.core.filter.FilterNode;
+import org.apache.servicecomb.foundation.test.scaffolding.exception.RuntimeExceptionWithoutStackTrace;
+import org.apache.servicecomb.foundation.vertx.http.HttpServletRequestEx;
+import org.apache.servicecomb.swagger.invocation.Response;
+import org.junit.Test;
+
+import mockit.Injectable;
+import mockit.Mock;
+import mockit.MockUp;
+
+public class ProducerInvocationFlowTest {
+  class TestFlow extends ProducerInvocationFlow {
+    public TestFlow(InvocationCreator invocationCreator) {
+      super(invocationCreator);
+    }
+
+    @Override
+    protected FilterNode getOrCreateFilterChain(Invocation invocation) {
+      return filterNode;
+    }
+
+    @Override
+    protected Invocation sendCreateInvocationException(Throwable throwable) {
+      sendException = throwable;
+      return null;
+    }
+
+    @Override
+    protected void sendResponse(Invocation invocation, Response response) {
+      sendInvocation = invocation;
+    }
+  }
+
+  FilterNode filterNode = FilterNode.EMPTY;
+
+  Throwable sendException;
+
+  Invocation sendInvocation;
+
+  @Test
+  public void should_send_exception_response_when_failed_to_create_invocation() {
+    RuntimeException exception = new RuntimeExceptionWithoutStackTrace();
+    TestFlow flow = new TestFlow(() -> {
+      throw exception;
+    });
+
+    flow.run();
+
+    assertThat(Exceptions.unwrap(sendException)).isSameAs(exception);
+  }
+
+  @Test
+  public void should_start_invocation_when_succeed_to_create_invocation(@Injectable Invocation invocation) {
+    TestFlow flow = new TestFlow(() -> invocation);
+    AtomicLong startTime = new AtomicLong();
+    new MockUp<Invocation>() {
+      @Mock
+      void onStart(HttpServletRequestEx requestEx, long start) {
+        startTime.set(start);
+      }
+    };
+    flow.run();
+
+    assertThat(startTime.get()).isNotEqualTo(0);
+  }
+
+  @Test
+  public void should_send_response_when_invocation_success(@Injectable Invocation invocation) {
+    TestFlow flow = new TestFlow(() -> invocation);
+
+    flow.run();
+
+    assertThat(sendInvocation).isSameAs(invocation);
+  }
+
+  @Test
+  public void should_finish_invocation_when_invocation_success(@Injectable Invocation invocation) {
+    TestFlow flow = new TestFlow(() -> invocation);
+    AtomicLong finishTime = new AtomicLong();
+    new MockUp<Invocation>() {
+      @Mock
+      void onFinish(Response response) {
+        finishTime.set(1);
+      }
+    };
+
+    flow.run();
+
+    assertThat(finishTime.get()).isEqualTo(1);
+  }
+
+  @Test
+  public void should_send_response_when_invocation_fail(@Injectable Invocation invocation) {
+    TestFlow flow = new TestFlow(() -> invocation);
+    filterNode = new FilterNode((_invocation, _node) -> {
+      throw new RuntimeExceptionWithoutStackTrace();
+    });
+
+    flow.run();
+
+    assertThat(sendInvocation).isSameAs(invocation);
+  }
+
+  @Test
+  public void should_finish_invocation_when_invocation_fail(@Injectable Invocation invocation) {
+    TestFlow flow = new TestFlow(() -> invocation);
+    filterNode = new FilterNode((_invocation, _node) -> {
+      throw new RuntimeExceptionWithoutStackTrace();
+    });
+    AtomicLong finishTime = new AtomicLong();
+    new MockUp<Invocation>() {
+      @Mock
+      void onFinish(Response response) {
+        finishTime.set(1);
+      }
+    };
+
+    flow.run();
+
+    assertThat(finishTime.get()).isEqualTo(1);
+  }
+}