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Flag enum insertions as errors #873

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merged 2 commits into from
Aug 2, 2021
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Merged

Flag enum insertions as errors #873

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fac9e56
Flag enum insertions as errors
ianbotsf Jul 29, 2021
c3fb83e
Clarify meaning of 'inserted' to be 'inserted before the end of the l…
ianbotsf Jul 30, 2021
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22 changes: 18 additions & 4 deletions smithy-diff/src/main/java/software/amazon/smithy/diff/evaluators/ChangedEnumTrait.java
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Original file line number Diff line number Diff line change
Expand Up @@ -29,8 +29,10 @@
import software.amazon.smithy.utils.Pair;

/**
* Emits a NOTE when a new enum value is added, emits an ERROR when an
* enum value is removed, and emits an ERROR when an enum name changes.
* Emits a NOTE when a new enum value is appended, emits an ERROR when an
* enum value is removed, emits an ERROR when an enum name changes, and
* emits an ERROR when a new enum value is inserted before the end of the
* list of existing values.
*/
public final class ChangedEnumTrait extends AbstractDiffEvaluator {
@Override
Expand All @@ -46,6 +48,7 @@ private List<ValidationEvent> validateEnum(ChangedShape<Shape> change, Pair<Enum
EnumTrait oldTrait = trait.getLeft();
EnumTrait newTrait = trait.getRight();
List<ValidationEvent> events = new ArrayList<>();
int oldEndPosition = oldTrait.getValues().size() - 1;

for (EnumDefinition definition : oldTrait.getValues()) {
Optional<EnumDefinition> maybeNewValue = newTrait.getValues().stream()
Expand All @@ -55,6 +58,7 @@ private List<ValidationEvent> validateEnum(ChangedShape<Shape> change, Pair<Enum
if (!maybeNewValue.isPresent()) {
events.add(error(change.getNewShape(), String.format(
"Enum value `%s` was removed", definition.getValue())));
oldEndPosition--;
} else {
EnumDefinition newValue = maybeNewValue.get();
if (!newValue.getName().equals(definition.getName())) {
Expand All @@ -67,11 +71,21 @@ private List<ValidationEvent> validateEnum(ChangedShape<Shape> change, Pair<Enum
}
}

int newPosition = 0;
for (EnumDefinition definition : newTrait.getValues()) {
if (!oldTrait.getEnumDefinitionValues().contains(definition.getValue())) {
events.add(note(change.getNewShape(), String.format(
"Enum value `%s` was added", definition.getValue())));
if (newPosition <= oldEndPosition) {
events.add(error(change.getNewShape(), String.format(
"Enum value `%s` was inserted before the end of the list of existing values. This can "
+ "cause compatibility issues when ordinal values are used for iteration, "
+ "serialization, etc.", definition.getValue())));
} else {
events.add(note(change.getNewShape(), String.format(
"Enum value `%s` was appended", definition.getValue())));
}
}

newPosition++;
}

return events;
Expand Down
60 changes: 59 additions & 1 deletion smithy-diff/src/test/java/software/amazon/smithy/diff/evaluators/ChangedEnumTraitTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.stringContainsInOrder;

import java.util.List;
import org.junit.jupiter.api.Test;
Expand All @@ -30,7 +31,7 @@

public class ChangedEnumTraitTest {
@Test
public void detectsAddedEnums() {
public void detectsAppendedEnums() {
StringShape s1 = StringShape.builder()
.id("foo.baz#Baz")
.addTrait(EnumTrait.builder()
Expand Down Expand Up @@ -96,4 +97,61 @@ public void detectsRenamedEnums() {
assertThat(TestHelper.findEvents(events, "ChangedEnumTrait").size(), equalTo(1));
assertThat(TestHelper.findEvents(events, Severity.ERROR).size(), equalTo(1));
}

@Test
public void detectsInsertedEnums() {
StringShape s1 = StringShape.builder()
.id("foo.baz#Baz")
.addTrait(EnumTrait.builder()
.addEnum(EnumDefinition.builder().value("foo").build())
.build())
.build();
StringShape s2 = StringShape.builder()
.id("foo.baz#Baz")
.addTrait(EnumTrait.builder()
.addEnum(EnumDefinition.builder().value("baz").build())
.addEnum(EnumDefinition.builder().value("foo").build())
.build())
.build();
Model modelA = Model.assembler().addShape(s1).assemble().unwrap();
Model modelB = Model.assembler().addShape(s2).assemble().unwrap();
List<ValidationEvent> events = ModelDiff.compare(modelA, modelB);

assertThat(TestHelper.findEvents(events, "ChangedEnumTrait").size(), equalTo(1));
assertThat(TestHelper.findEvents(events, "ChangedEnumTrait").get(0).getSeverity(), equalTo(Severity.ERROR));
}

@Test
public void detectsAppendedEnumsAfterRemovedEnums() {
StringShape s1 = StringShape.builder()
.id("foo.baz#Baz")
.addTrait(EnumTrait.builder()
.addEnum(EnumDefinition.builder().value("old1").build())
.addEnum(EnumDefinition.builder().value("old2").build())
.addEnum(EnumDefinition.builder().value("old3").build())
.build())
.build();
StringShape s2 = StringShape.builder()
.id("foo.baz#Baz")
.addTrait(EnumTrait.builder()
.addEnum(EnumDefinition.builder().value("old1").build())
.addEnum(EnumDefinition.builder().value("old3").build())
.addEnum(EnumDefinition.builder().value("new1").build())
.build())
.build();
Model modelA = Model.assembler().addShape(s1).assemble().unwrap();
Model modelB = Model.assembler().addShape(s2).assemble().unwrap();
List<ValidationEvent> allEvents = ModelDiff.compare(modelA, modelB);

List<ValidationEvent> changeEvents = TestHelper.findEvents(allEvents, "ChangedEnumTrait");
assertThat(changeEvents.size(), equalTo(2));

ValidationEvent removedEvent = changeEvents.get(0);
assertThat(removedEvent.getSeverity(), equalTo(Severity.ERROR));
assertThat(removedEvent.getMessage(), stringContainsInOrder("Enum value `old2` was removed"));

ValidationEvent appendedEvent = changeEvents.get(1);
assertThat(appendedEvent.getSeverity(), equalTo(Severity.NOTE));
assertThat(appendedEvent.getMessage(), stringContainsInOrder("Enum value `new1` was appended"));
}
}