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Fix issue with Jackson 2.15: Can not write a field name, expecting a …
…value (#15564) This commit fixes the issue with Jackson > 2.15 and `log.format=json`: "Can not write a field name, expecting a value", by adding a default serializers for JRuby's objects.
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116 changes: 116 additions & 0 deletions
116
logstash-core/src/main/java/org/logstash/log/RubyBasicObjectSerializer.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| /* | ||
| * Licensed to Elasticsearch B.V. under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright | ||
| * ownership. Elasticsearch B.V. 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. | ||
| */ | ||
|
|
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| package org.logstash.log; | ||
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| import com.fasterxml.jackson.core.JsonGenerator; | ||
| import com.fasterxml.jackson.databind.JsonMappingException; | ||
| import com.fasterxml.jackson.databind.JsonSerializer; | ||
| import com.fasterxml.jackson.databind.SerializerProvider; | ||
| import com.fasterxml.jackson.databind.ser.std.StdSerializer; | ||
| import com.fasterxml.jackson.databind.util.ClassUtil; | ||
| import org.apache.logging.log4j.LogManager; | ||
| import org.apache.logging.log4j.Logger; | ||
| import org.jruby.RubyBasicObject; | ||
| import org.jruby.RubyMethod; | ||
| import org.jruby.RubyString; | ||
| import org.jruby.exceptions.NameError; | ||
| import org.logstash.RubyUtil; | ||
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| import java.io.IOException; | ||
| import java.util.Optional; | ||
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| /** | ||
| * Default serializer for {@link org.jruby.RubyBasicObject} since Jackson can't handle that type natively. | ||
| * Arrays, Collections and Maps are delegated to the default Jackson's serializer - which might end-up invoking this | ||
| * serializer for its elements. | ||
| * Values which inspect method is implemented and owned by the LogStash module will be serialized using this method return. | ||
| * If none of the above conditions match, it gets the serialized value by invoking the Ruby's {@code to_s} method, falling back | ||
| * to {@link RubyBasicObject#to_s()} and {@link RubyBasicObject#anyToString()} in case of errors. | ||
| */ | ||
| public final class RubyBasicObjectSerializer extends StdSerializer<RubyBasicObject> { | ||
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| private static final long serialVersionUID = -5557562960691452054L; | ||
| private static final Logger LOGGER = LogManager.getLogger(RubyBasicObjectSerializer.class); | ||
| private static final String METHOD_INSPECT = "inspect"; | ||
| private static final String METHOD_TO_STRING = "to_s"; | ||
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| public RubyBasicObjectSerializer() { | ||
| super(RubyBasicObject.class); | ||
| } | ||
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| @Override | ||
| public void serialize(final RubyBasicObject value, final JsonGenerator gen, final SerializerProvider provider) throws IOException { | ||
| final Optional<JsonSerializer<Object>> serializer = findTypeSerializer(value, provider); | ||
| if (serializer.isPresent()) { | ||
| try { | ||
| serializer.get().serialize(value, gen, provider); | ||
| return; | ||
| } catch (IOException e) { | ||
| LOGGER.debug("Failed to serialize value type {} using default serializer {}", value.getClass(), serializer.get().getClass(), e); | ||
| } | ||
| } | ||
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| if (isCustomInspectMethodDefined(value)) { | ||
| try { | ||
| gen.writeString(value.callMethod(METHOD_INSPECT).asJavaString()); | ||
| return; | ||
| } catch (Exception e) { | ||
| LOGGER.debug("Failed to serialize value type {} using the custom `inspect` method", value.getMetaClass(), e); | ||
| } | ||
| } | ||
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| try { | ||
| gen.writeString(value.callMethod(METHOD_TO_STRING).asJavaString()); | ||
| return; | ||
| } catch (Exception e) { | ||
| LOGGER.debug("Failed to serialize value type {} using `to_s` method", value.getMetaClass(), e); | ||
| } | ||
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| try { | ||
| gen.writeString(value.to_s().asJavaString()); | ||
| } catch (Exception e) { | ||
| LOGGER.debug("Failed to serialize value type {} using `RubyBasicObject#to_s()` method", value.getMetaClass(), e); | ||
| gen.writeString(value.anyToString().asJavaString()); | ||
| } | ||
| } | ||
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| private Optional<JsonSerializer<Object>> findTypeSerializer(final RubyBasicObject value, final SerializerProvider provider) { | ||
| if (ClassUtil.isCollectionMapOrArray(value.getClass())) { | ||
| try { | ||
| // Delegates the serialization to the Jackson's default serializers, which might | ||
| // end up using this serializer for its elements. | ||
| return Optional.ofNullable(provider.findTypedValueSerializer(value.getJavaClass(), false, null)); | ||
| } catch (JsonMappingException e) { | ||
| // Ignored | ||
| } | ||
| } | ||
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| return Optional.empty(); | ||
| } | ||
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| private boolean isCustomInspectMethodDefined(final RubyBasicObject value) { | ||
| try { | ||
| final Object candidate = value.method(RubyString.newString(RubyUtil.RUBY, METHOD_INSPECT)); | ||
| return candidate instanceof RubyMethod && ((RubyMethod) candidate).owner(RubyUtil.RUBY.getCurrentContext()).toString().toLowerCase().startsWith("logstash"); | ||
| } catch (NameError e) { | ||
| return false; | ||
| } | ||
| } | ||
| } |
52 changes: 52 additions & 0 deletions
52
logstash-core/src/test/java/org/logstash/ObjectMappersTest.java
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| @@ -0,0 +1,52 @@ | ||
| package org.logstash; | ||
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| import com.fasterxml.jackson.databind.JavaType; | ||
| import com.fasterxml.jackson.databind.JsonSerializer; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.fasterxml.jackson.databind.ser.BeanSerializerFactory; | ||
| import com.fasterxml.jackson.databind.ser.Serializers; | ||
| import com.fasterxml.jackson.databind.type.TypeFactory; | ||
| import org.jruby.RubyBasicObject; | ||
| import org.junit.Test; | ||
| import org.logstash.log.RubyBasicObjectSerializer; | ||
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| import java.util.LinkedList; | ||
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| import static org.junit.Assert.assertNotNull; | ||
| import static org.junit.Assert.assertTrue; | ||
| import static org.logstash.ObjectMappers.RUBY_BASIC_OBJECT_SERIALIZERS_MODULE_ID; | ||
| import static org.logstash.ObjectMappers.RUBY_SERIALIZERS_MODULE_ID; | ||
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| public class ObjectMappersTest { | ||
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| @Test | ||
| public void testLog4jOMRegisterRubySerializersModule() { | ||
| assertTrue(ObjectMappers.LOG4J_JSON_MAPPER.getRegisteredModuleIds().contains(RUBY_SERIALIZERS_MODULE_ID)); | ||
| } | ||
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| @Test | ||
| public void testLog4jOMRegisterRubyBasicObjectSerializersModule() { | ||
| assertTrue(ObjectMappers.LOG4J_JSON_MAPPER.getRegisteredModuleIds().contains(RUBY_BASIC_OBJECT_SERIALIZERS_MODULE_ID)); | ||
| } | ||
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| @Test | ||
| public void testLog4jOMRegisterRubyBasicObjectSerializersFirst() { | ||
| final ObjectMapper mapper = ObjectMappers.LOG4J_JSON_MAPPER; | ||
| final BeanSerializerFactory factory = (BeanSerializerFactory) mapper.getSerializerFactory(); | ||
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| final LinkedList<Serializers> list = new LinkedList<>(); | ||
| for (Serializers serializer : factory.getFactoryConfig().serializers()) { | ||
| list.add(serializer); | ||
| } | ||
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| // RubyBasicObjectSerializer + Log4jJsonModule | ||
| assertTrue(list.size() > 1); | ||
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| final Serializers rubyBasicObjectSerializer = list.get(list.size() - 2); | ||
| final JavaType valueType = TypeFactory.defaultInstance().constructType(RubyBasicObject.class); | ||
| final JsonSerializer<?> found = rubyBasicObjectSerializer.findSerializer(mapper.getSerializationConfig(), valueType, null); | ||
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| assertNotNull(found); | ||
| assertTrue("RubyBasicObjectSerializer must be registered before others non-default serializers", found instanceof RubyBasicObjectSerializer); | ||
| } | ||
| } |
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