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Fix potential NPE in Layout Inspector

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Summary: Fixed NPE linked by task. From the code, that stuff should never be null, unless there is some threading / concurrency issue, which there apparently is. In that case, failing with a warning is imho a bit more elegant than raising exceptions from a debugging tool

Reviewed By: lblasa

Differential Revision: D32278044

fbshipit-source-id: 710fcdcfe458f33bbb806d9f2f1b9352252eedec
This commit is contained in:
Michel Weststrate
2021-11-09 06:51:50 -08:00
committed by Facebook GitHub Bot
parent cd58ef96a2
commit 750f26eaa3
2 changed files with 7 additions and 9 deletions
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6
android/src/main/java/com/facebook/flipper/plugins/inspector/InspectorFlipperPlugin.java
View File

@@ -592,7 +592,11 @@ public class InspectorFlipperPlugin implements FlipperPlugin {
@Override
protected void runOrThrow() throws Exception {
for (int i = 0, count = descriptor.getChildCount(obj); i < count; i++) {
final Object child = assertNotNull(descriptor.getChildAt(obj, i));
final Object child = descriptor.getChildAt(obj, i);
if (child == null) {
Log.w(TAG, "Failed to get child at index: " + i);
break;
}
children.put(trackObject(child));
}
}

10
android/src/test/java/com/facebook/flipper/plugins/inspector/InspectorFlipperPluginTest.java
View File

@@ -7,7 +7,6 @@
package com.facebook.flipper.plugins.inspector;
import static com.facebook.flipper.plugins.inspector.ThrowableMessageMatcher.hasThrowableWithMessage;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.hasItem;
import static org.hamcrest.MatcherAssert.assertThat;
@@ -31,7 +30,6 @@ import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import javax.annotation.Nullable;
import org.hamcrest.CoreMatchers;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
@@ -325,7 +323,7 @@ public class InspectorFlipperPluginTest {
}
@Test
public void testNullChildThrows() throws Exception {
public void testNullChildNotThrows() throws Exception {
final InspectorFlipperPlugin plugin =
new InspectorFlipperPlugin(mApp, mDescriptorMapping, null);
final FlipperResponderMock responder = new FlipperResponderMock();
@@ -344,11 +342,7 @@ public class InspectorFlipperPluginTest {
new FlipperObject.Builder().put("ids", new FlipperArray.Builder().put("test")).build(),
responder);
assertThat(connection.errors.size(), equalTo(1));
assertThat(
connection.errors,
CoreMatchers.hasItem(
hasThrowableWithMessage("java.lang.RuntimeException: Unexpected null value")));
assertThat(connection.errors.size(), equalTo(0));
}
private class TestNode {