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https://issues.apache.org/jira/browse/NIFI-2565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15572093#comment-15572093
 ] 

ASF GitHub Bot commented on NIFI-2565:
--------------------------------------

Github user markap14 commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/1108#discussion_r83228132
  
    --- Diff: 
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/GrokParser.java
 ---
    @@ -0,0 +1,243 @@
    +/*
    + * 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.nifi.processors.standard;
    +
    +import com.fasterxml.jackson.databind.ObjectMapper;
    +import oi.thekraken.grok.api.Grok;
    +import oi.thekraken.grok.api.Match;
    +import oi.thekraken.grok.api.exception.GrokException;
    +import org.apache.nifi.annotation.behavior.ReadsAttribute;
    +import org.apache.nifi.annotation.behavior.ReadsAttributes;
    +import org.apache.nifi.annotation.behavior.WritesAttribute;
    +import org.apache.nifi.annotation.behavior.WritesAttributes;
    +import org.apache.nifi.annotation.documentation.CapabilityDescription;
    +import org.apache.nifi.annotation.documentation.SeeAlso;
    +import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.annotation.lifecycle.OnScheduled;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.flowfile.attributes.CoreAttributes;
    +import org.apache.nifi.flowfile.FlowFile;
    +
    +import org.apache.nifi.processor.AbstractProcessor;
    +import org.apache.nifi.processor.DataUnit;
    +import org.apache.nifi.processor.ProcessorInitializationContext;
    +import org.apache.nifi.processor.Relationship;
    +import org.apache.nifi.processor.ProcessContext;
    +import org.apache.nifi.processor.ProcessSession;
    +import org.apache.nifi.processor.exception.ProcessException;
    +import org.apache.nifi.processor.io.InputStreamCallback;
    +import org.apache.nifi.processor.io.StreamCallback;
    +import org.apache.nifi.processor.util.StandardValidators;
    +import org.apache.nifi.stream.io.BufferedOutputStream;
    +import org.apache.nifi.stream.io.StreamUtils;
    +import java.io.IOException;
    +import java.io.InputStream;
    +import java.io.OutputStream;
    +import java.nio.charset.Charset;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.HashMap;
    +import java.util.Set;
    +import java.util.HashSet;
    +import java.util.ArrayList;
    +import java.util.Collections;
    +
    +
    +@Tags({"Grok Processor"})
    +@CapabilityDescription("Use Grok expression ,a la logstash, to parse 
data.")
    +@SeeAlso({})
    +@ReadsAttributes({@ReadsAttribute(attribute="", description="")})
    +@WritesAttributes({@WritesAttribute(attribute="", description="")})
    +public class GrokParser extends AbstractProcessor {
    +
    +
    +    public static final String DESTINATION_ATTRIBUTE = 
"flowfile-attribute";
    +    public static final String DESTINATION_CONTENT = "flowfile-content";
    +    private static final String APPLICATION_JSON = "application/json";
    +
    +    public static final PropertyDescriptor GROK_EXPRESSION = new 
PropertyDescriptor
    +            .Builder().name("Grok Expression")
    +            .description("Grok expression")
    +            .required(true)
    +            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
    +            .build();
    +
    +    public static final PropertyDescriptor GROK_PATTERN_FILE = new 
PropertyDescriptor
    +            .Builder().name("Grok Pattern file")
    +            .description("Grok Pattern file definition")
    +            .required(false)
    +            .addValidator(StandardValidators.FILE_EXISTS_VALIDATOR)
    +            .build();
    +
    +    public static final PropertyDescriptor DESTINATION = new 
PropertyDescriptor.Builder()
    +            .name("Destination")
    +            .description("Control if Grok output value is written as a new 
flowfile attribute  " +
    +                    "or written in the flowfile content. Writing to 
flowfile content will overwrite any " +
    +                    "existing flowfile content.")
    +            .required(true)
    +            .allowableValues(DESTINATION_ATTRIBUTE, DESTINATION_CONTENT)
    +            .defaultValue(DESTINATION_ATTRIBUTE)
    +            .build();
    +
    +    public static final PropertyDescriptor CHARACTER_SET = new 
PropertyDescriptor
    +            .Builder().name("Character Set")
    +            .description("The Character Set in which the file is encoded")
    +            .required(true)
    +            .addValidator(StandardValidators.CHARACTER_SET_VALIDATOR)
    +            .defaultValue("UTF-8")
    +            .build();
    +
    +    public static final PropertyDescriptor MAX_BUFFER_SIZE = new 
PropertyDescriptor
    +            .Builder().name("Maximum Buffer Size")
    +            .description("Specifies the maximum amount of data to buffer 
(per file) in order to apply the Grok expressions. Files larger than the 
specified maximum will not be fully evaluated.")
    +            .required(true)
    +            .addValidator(StandardValidators.DATA_SIZE_VALIDATOR)
    +            
.addValidator(StandardValidators.createDataSizeBoundsValidator(0, 
Integer.MAX_VALUE))
    +            .defaultValue("1 MB")
    +            .build();
    +
    +    public static final Relationship REL_MATCH = new Relationship.Builder()
    +            .name("matched")
    +            .description("FlowFiles are routed to this relationship when 
the Grok Expression is successfully evaluated and the FlowFile is modified as a 
result")
    +            .build();
    +
    +    public static final Relationship REL_NO_MATCH = new 
Relationship.Builder()
    +            .name("unmatched")
    +            .description("FlowFiles are routed to this relationship when 
no provided Grok Expression matches the content of the FlowFile")
    +            .build();
    +
    +    private List<PropertyDescriptor> descriptors;
    +
    +    private Set<Relationship> relationships;
    +
    +    private static final ObjectMapper objectMapper = new ObjectMapper();
    +
    +    private Grok grok;
    +    private byte[] buffer;
    +
    +
    +    @Override
    +    protected void init(final ProcessorInitializationContext context) {
    +        final List<PropertyDescriptor> descriptors = new 
ArrayList<PropertyDescriptor>();
    +        descriptors.add(GROK_EXPRESSION);
    +        descriptors.add(GROK_PATTERN_FILE);
    +        descriptors.add(DESTINATION);
    +        descriptors.add(CHARACTER_SET);
    +        descriptors.add(MAX_BUFFER_SIZE);
    +        this.descriptors = Collections.unmodifiableList(descriptors);
    +
    +        final Set<Relationship> relationships = new 
HashSet<Relationship>();
    +        relationships.add(REL_MATCH);
    +        relationships.add(REL_NO_MATCH);
    +        this.relationships = Collections.unmodifiableSet(relationships);
    +    }
    +
    +    @Override
    +    public Set<Relationship> getRelationships() {
    +        return this.relationships;
    +    }
    +
    +    @Override
    +    public final List<PropertyDescriptor> 
getSupportedPropertyDescriptors() {
    +        return descriptors;
    +    }
    +
    +    @OnScheduled
    +    public void onScheduled(final ProcessContext context) {
    +
    +        final int maxBufferSize = 
context.getProperty(MAX_BUFFER_SIZE).asDataSize(DataUnit.B).intValue();
    +        buffer = new byte[maxBufferSize];
    +
    +        try{
    +            grok = 
Grok.create(context.getProperty(GROK_PATTERN_FILE).getValue());
    +            grok.compile(context.getProperty(GROK_EXPRESSION).getValue());
    +        }catch (GrokException e){
    +            getLogger().error("Failed to initialize ExtractGrok due to: ", 
e);
    --- End diff --
    
    If this is the case, the Processor will not behave properly. In fact, if 
the Grok.create() throws an Exception, the previous value will still be stored 
in the 'grok' member variable, which means that if the user changes the value, 
and we can't create a Grok for the new value, the processor will continue to 
use the old value. Instead, we should avoid catching this Exception and just 
declare the method to throw GrokException.


> NiFi processor to parse logs using Grok patterns
> ------------------------------------------------
>
>                 Key: NIFI-2565
>                 URL: https://issues.apache.org/jira/browse/NIFI-2565
>             Project: Apache NiFi
>          Issue Type: Improvement
>            Reporter: Andre
>             Fix For: 1.1.0
>
>
> Following up on Ryan Ward to create a Grok capable parser
> https://mail-archives.apache.org/mod_mbox/nifi-dev/201606.mbox/%3CCADD=rnPa8nHkJbeM280=PTQ=wurtwhstm5u+7btoo9pcym2...@mail.gmail.com%3E



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