mirror of https://github.com/apache/nifi.git
NIFI-994: Initial import of TailFile
This commit is contained in:
Mark Payne
parent
49ee06b0a2
commit
31f0909bd3
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.nifi.processors.standard;
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import java.io.BufferedOutputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.io.RandomAccessFile;
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import java.nio.file.DirectoryStream;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.concurrent.TimeUnit;
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import java.util.zip.CRC32;
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import java.util.zip.CheckedInputStream;
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import java.util.zip.Checksum;
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import org.apache.commons.lang3.StringUtils;
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import org.apache.nifi.annotation.behavior.TriggerSerially;
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import org.apache.nifi.annotation.documentation.CapabilityDescription;
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import org.apache.nifi.annotation.documentation.Tags;
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import org.apache.nifi.annotation.lifecycle.OnScheduled;
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import org.apache.nifi.components.PropertyDescriptor;
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import org.apache.nifi.flowfile.FlowFile;
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import org.apache.nifi.flowfile.attributes.CoreAttributes;
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import org.apache.nifi.processor.AbstractProcessor;
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import org.apache.nifi.processor.ProcessContext;
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import org.apache.nifi.processor.ProcessSession;
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import org.apache.nifi.processor.Relationship;
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import org.apache.nifi.processor.exception.ProcessException;
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import org.apache.nifi.processor.io.OutputStreamCallback;
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import org.apache.nifi.processor.util.StandardValidators;
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import org.apache.nifi.stream.io.NullOutputStream;
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import org.apache.nifi.stream.io.StreamUtils;
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import org.apache.nifi.util.LongHolder;
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// note: it is important that this Processor is not marked as @SupportsBatching because the session commits must complete before persisting state locally; otherwise, data loss may occur
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@TriggerSerially
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@Tags({"tail", "file", "log", "text", "source"})
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@CapabilityDescription("\"Tails\" a file, ingesting data from the file as it is written to the file. The file is expected to be textual. Data is ingested only when a "
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+ "new line is encountered (carriage return or new-line character or combination). If the file to tail is periodically \"rolled over\", as is generally the case "
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+ "with log files, an optional Rolling Filename Pattern can be used to retrieve data from files that have rolled over, even if the rollover occurred while NiFi "
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+ "was not running (provided that the data still exists upon restart of NiFi).")
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public class TailFile extends AbstractProcessor {
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static final PropertyDescriptor FILENAME = new PropertyDescriptor.Builder()
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.name("File to Tail")
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.description("Fully-qualified filename of the file that should be tailed")
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.expressionLanguageSupported(false)
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.addValidator(StandardValidators.FILE_EXISTS_VALIDATOR)
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.required(true)
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.build();
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static final PropertyDescriptor ROLLING_FILENAME_PATTERN = new PropertyDescriptor.Builder()
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.name("Rolling Filename Pattern")
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.description("If the file to tail \"rolls over\" as would be the case with log files, this filename pattern will be used to "
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+ "identify files that have rolled over so that if NiFi is restarted, and the file has rolled over, it will be able to pick up where it left off. "
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+ "This pattern supports wildcard characters * and ? and will assume that the files that have rolled over live in the same directory as the file being tailed.")
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.addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
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.expressionLanguageSupported(false)
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.required(false)
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.build();
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static final PropertyDescriptor STATE_FILE = new PropertyDescriptor.Builder()
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.name("State File")
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.description("Specifies the file that should be used for storing state about what data has been ingested so that upon restart NiFi can resume from where it left off")
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.addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
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.expressionLanguageSupported(false)
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.required(true)
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.build();
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static final Relationship REL_SUCCESS = new Relationship.Builder()
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.name("success")
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.description("All FlowFiles are routed to this Relationship.")
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.build();
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private volatile TailFileState state = new TailFileState(null, null, null, 0L, 0L, null, new byte[65536]);
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private volatile boolean recoveredRolledFiles = false;
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private volatile Long expectedRecoveryChecksum;
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@Override
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protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
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final List<PropertyDescriptor> properties = new ArrayList<>();
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properties.add(FILENAME);
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properties.add(ROLLING_FILENAME_PATTERN);
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properties.add(new PropertyDescriptor.Builder().fromPropertyDescriptor(STATE_FILE).defaultValue("./conf/state/" + getIdentifier()).build());
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return properties;
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}
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@Override
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public Set<Relationship> getRelationships() {
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return Collections.singleton(REL_SUCCESS);
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}
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@Override
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public void onPropertyModified(final PropertyDescriptor descriptor, final String oldValue, final String newValue) {
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if (FILENAME.equals(descriptor)) {
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state = new TailFileState(newValue, null, null, 0L, 0L, null, new byte[65536]);
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recoveredRolledFiles = false;
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} else if (ROLLING_FILENAME_PATTERN.equals(descriptor)) {
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recoveredRolledFiles = false;
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}
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}
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@OnScheduled
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public void recoverState(final ProcessContext context) throws IOException {
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recoveredRolledFiles = false;
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final String tailFilename = context.getProperty(FILENAME).getValue();
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final String stateFilename = context.getProperty(STATE_FILE).getValue();
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final File stateFile = new File(stateFilename);
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try (final FileInputStream fis = new FileInputStream(stateFile);
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final DataInputStream dis = new DataInputStream(fis)) {
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final int encodingVersion = dis.readInt();
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if (encodingVersion > 0) {
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throw new IOException("Unable to recover state because State File was encoded in a more recent version than Version 1");
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}
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if (encodingVersion == 0) {
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final String filename = dis.readUTF();
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final long position = dis.readLong();
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final long timestamp = dis.readLong();
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final boolean checksumPresent = dis.readBoolean();
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RandomAccessFile reader = null;
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File tailFile = null;
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if (checksumPresent && tailFilename.equals(filename)) {
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expectedRecoveryChecksum = dis.readLong();
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// We have an expected checksum and the currently configured filename is the same as the state file.
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// We need to check if the existing file is the same as the one referred to in the state file based on
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// the checksum.
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final File existingTailFile = new File(filename);
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if (existingTailFile.length() >= position) {
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try (final InputStream tailFileIs = new FileInputStream(existingTailFile);
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final CheckedInputStream in = new CheckedInputStream(tailFileIs, new CRC32())) {
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StreamUtils.copy(in, new NullOutputStream(), state.getPosition());
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final long checksumResult = in.getChecksum().getValue();
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if (checksumResult == expectedRecoveryChecksum) {
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tailFile = existingTailFile;
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reader = new RandomAccessFile(tailFile, "r");
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reader.seek(position);
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}
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}
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}
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state = new TailFileState(tailFilename, tailFile, reader, position, timestamp, null, new byte[65536]);
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} else {
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expectedRecoveryChecksum = null;
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// tailing a new file since the state file was written out. We will reset state.
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state = new TailFileState(tailFilename, null, null, 0L, 0L, null, new byte[65536]);
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}
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} else {
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// encoding Version == -1... no data in file. Just move on.
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}
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} catch (final FileNotFoundException fnfe) {
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}
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}
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public void persistState(final TailFileState state, final String stateFilename) throws IOException {
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final File stateFile = new File(stateFilename);
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File directory = stateFile.getParentFile();
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if (directory != null && !directory.exists() && !directory.mkdirs()) {
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getLogger().warn("Failed to persist state to {} because the parent directory does not exist and could not be created. This may result in data being duplicated upon restart of NiFi");
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return;
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}
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try (final FileOutputStream fos = new FileOutputStream(stateFile);
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final DataOutputStream dos = new DataOutputStream(fos)) {
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dos.writeInt(0); // version
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dos.writeUTF(state.getFilename());
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dos.writeLong(state.getPosition());
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dos.writeLong(state.getTimestamp());
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if (state.getChecksum() == null) {
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dos.writeBoolean(false);
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} else {
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dos.writeBoolean(true);
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dos.writeLong(state.getChecksum().getValue());
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}
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}
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}
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private RandomAccessFile createReader(final File file, final long position) {
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final RandomAccessFile reader;
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try {
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reader = new RandomAccessFile(file, "r");
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} catch (final FileNotFoundException fnfe) {
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getLogger().debug("File {} does not exist; yielding and returning", new Object[] {file});
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return null;
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}
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try {
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reader.seek(position);
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} catch (final IOException ioe) {
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getLogger().error("Failed to read from {} due to {}", new Object[] {file, ioe});
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try {
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reader.close();
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} catch (final IOException ioe2) {
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}
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return null;
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}
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return reader;
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}
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// for testing purposes
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TailFileState getState() {
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return state;
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}
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/**
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* Finds any files that have rolled over and have not yet been ingested by this Processor. Each of these files that is found will be
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* ingested as its own FlowFile. If a file is found that has been partially ingested, the rest of the file will be ingested as a
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* single FlowFile but the data that already has been ingested will not be ingested again.
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*
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* @param context the ProcessContext to use in order to obtain Processor configuration
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* @param session the ProcessSession to use in order to interact with FlowFile creation and content.
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*/
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private void recoverRolledFiles(final ProcessContext context, final ProcessSession session) {
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try {
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// Find all files that match our rollover pattern, if any, and order them based on their timestamp and filename.
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// Ignore any file that has a timestamp earlier than the state that we have persisted. If we were reading from
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// a file when we stopped running, then that file that we were reading from should be the first file in this list,
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// assuming that the file still exists on the file system.
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final List<File> rolledOffFiles = getRolledOffFiles(context, state.getTimestamp());
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// For first file that we find, it may or may not be the file that we were last reading from.
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// As a result, we have to read up to the position we stored, while calculating the checksum. If the checksums match,
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// then we know we've already processed this file. If the checksums do not match, then we have not
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// processed this file and we need to seek back to position 0 and ingest the entire file.
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// For all other files that have been rolled over, we need to just ingest the entire file.
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if (!rolledOffFiles.isEmpty() && expectedRecoveryChecksum != null && rolledOffFiles.get(0).length() >= state.getPosition()) {
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final File firstFile = rolledOffFiles.get(0);
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final long startNanos = System.nanoTime();
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try (final InputStream fis = new FileInputStream(firstFile);
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final CheckedInputStream in = new CheckedInputStream(fis, new CRC32())) {
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StreamUtils.copy(in, new NullOutputStream(), state.getPosition());
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final long checksumResult = in.getChecksum().getValue();
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if (checksumResult == expectedRecoveryChecksum) {
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// This is the same file that we were reading when we shutdown. Start reading from this point on.
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rolledOffFiles.remove(0);
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FlowFile flowFile = session.create();
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flowFile = session.importFrom(in, flowFile);
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flowFile = session.putAttribute(flowFile, "filename", firstFile.getName());
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session.getProvenanceReporter().receive(flowFile, firstFile.toURI().toString(), "FlowFile contains bytes 0 through " + state.getPosition() + " of source file",
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TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startNanos));
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session.transfer(flowFile, REL_SUCCESS);
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// use a timestamp of lastModified() + 1 so that we do not ingest this file again.
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state = new TailFileState(context.getProperty(FILENAME).getValue(), null, null, 0L, firstFile.lastModified() + 1L, null, state.getBuffer());
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// must ensure that we do session.commit() before persisting state in order to avoid data loss.
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session.commit();
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persistState(state, context.getProperty(STATE_FILE).getValue());
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}
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}
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}
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// For each file that we found that matches our Rollover Pattern, and has a last modified date later than the timestamp
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// that we recovered from the state file, we need to consume the entire file. The only exception to this is the file that
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// we were reading when we last stopped, as it may already have been partially consumed. That is taken care of in the
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// above block of code.
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for (final File file : rolledOffFiles) {
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FlowFile flowFile = session.create();
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flowFile = session.importFrom(file.toPath(), true, flowFile);
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flowFile = session.putAttribute(flowFile, "filename", file.getName());
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session.getProvenanceReporter().receive(flowFile, file.toURI().toString());
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session.transfer(flowFile, REL_SUCCESS);
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// use a timestamp of lastModified() + 1 so that we do not ingest this file again.
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state = new TailFileState(context.getProperty(FILENAME).getValue(), null, null, 0L, file.lastModified() + 1L, null, state.getBuffer());
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// must ensure that we do session.commit() before persisting state in order to avoid data loss.
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session.commit();
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persistState(state, context.getProperty(STATE_FILE).getValue());
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}
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} catch (final IOException e) {
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getLogger().error("Failed to recover files that have rolled over due to {}", new Object[] {e});
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}
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}
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@Override
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public void onTrigger(final ProcessContext context, final ProcessSession session) throws ProcessException {
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// If this is the first time the processor has run since it was started, we need to check for any files that may have rolled over
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// while the processor was stopped. If we find any, we need to import them into the flow.
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if (!recoveredRolledFiles) {
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recoverRolledFiles(context, session);
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recoveredRolledFiles = true;
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}
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// initialize local variables from state object; this is done so that we can easily change the values throughout
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// the onTrigger method and then create a new state object after we finish processing the files.
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TailFileState state = this.state;
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File file = state.getFile();
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RandomAccessFile reader = state.getReader();
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Checksum checksum = state.getChecksum();
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if (checksum == null) {
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checksum = new CRC32();
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}
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long position = state.getPosition();
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long timestamp = state.getTimestamp();
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// Create a reader if necessary.
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if (file == null || reader == null) {
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file = new File(context.getProperty(FILENAME).getValue());
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reader = createReader(file, position);
|
||||||
|
if (reader == null) {
|
||||||
|
context.yield();
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
final long startNanos = System.nanoTime();
|
||||||
|
|
||||||
|
// Check if file has rotated
|
||||||
|
long fileLength = file.length();
|
||||||
|
if (fileLength < position) {
|
||||||
|
// File has rotated. It's possible that it rotated before we finished reading all of the data. As a result, we need
|
||||||
|
// to check the last rolled-over file and see if it is longer than our position. If so, consume the data past our
|
||||||
|
// marked position.
|
||||||
|
try {
|
||||||
|
final List<File> updatedRolledOverFiles = getRolledOffFiles(context, timestamp);
|
||||||
|
if (!updatedRolledOverFiles.isEmpty()) {
|
||||||
|
final File lastRolledOver = updatedRolledOverFiles.get(updatedRolledOverFiles.size() - 1);
|
||||||
|
|
||||||
|
// there is more data in the file that has not yet been consumed.
|
||||||
|
if (lastRolledOver.length() > state.getPosition()) {
|
||||||
|
try (final FileInputStream fis = new FileInputStream(lastRolledOver)) {
|
||||||
|
StreamUtils.skip(fis, state.getPosition());
|
||||||
|
|
||||||
|
FlowFile flowFile = session.create();
|
||||||
|
flowFile = session.importFrom(fis, flowFile);
|
||||||
|
flowFile = session.putAttribute(flowFile, "filename", lastRolledOver.getName());
|
||||||
|
|
||||||
|
session.getProvenanceReporter().receive(flowFile, lastRolledOver.toURI().toString(), "FlowFile contains bytes " + state.getPosition() + " through " +
|
||||||
|
lastRolledOver.length() + " of source file", TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startNanos));
|
||||||
|
session.transfer(flowFile, REL_SUCCESS);
|
||||||
|
this.state = state = new TailFileState(context.getProperty(FILENAME).getValue(), null, null, 0L, lastRolledOver.lastModified() + 1L, null, state.getBuffer());
|
||||||
|
|
||||||
|
// must ensure that we do session.commit() before persisting state in order to avoid data loss.
|
||||||
|
session.commit();
|
||||||
|
persistState(state, context.getProperty(STATE_FILE).getValue());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
} catch (final IOException ioe) {
|
||||||
|
getLogger().error("File being tailed was rolled over. However, was unable to determine which \"Rollover Files\" exist or read the last one due to {}. "
|
||||||
|
+ "It is possible that data at the end of the last file will be skipped as a result.", new Object[] {ioe});
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
// Since file has rotated, we close the reader, create a new one, and then reset our state.
|
||||||
|
try {
|
||||||
|
reader.close();
|
||||||
|
} catch (final IOException ioe) {
|
||||||
|
getLogger().warn("Failed to close reader for {} due to {}", new Object[] {file, ioe});
|
||||||
|
}
|
||||||
|
|
||||||
|
reader = createReader(file, 0L);
|
||||||
|
position = 0L;
|
||||||
|
checksum.reset();
|
||||||
|
fileLength = file.length();
|
||||||
|
}
|
||||||
|
|
||||||
|
// check if there is any data to consume by checking if file has grown or last modified timestamp has changed.
|
||||||
|
boolean consumeData = false;
|
||||||
|
if (fileLength > position) {
|
||||||
|
consumeData = true;
|
||||||
|
} else if (file.lastModified() > timestamp) {
|
||||||
|
// This can happen if file is truncated, or is replaced with the same amount of data as the old file.
|
||||||
|
position = 0;
|
||||||
|
|
||||||
|
try {
|
||||||
|
reader.seek(0L);
|
||||||
|
} catch (final IOException ioe) {
|
||||||
|
getLogger().error("Failed to seek to beginning of file due to {}", new Object[] {ioe});
|
||||||
|
context.yield();
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
consumeData = true;
|
||||||
|
}
|
||||||
|
|
||||||
|
// If there is data to consume, read as much as we can.
|
||||||
|
final TailFileState currentState = state;
|
||||||
|
final Checksum chksum = checksum;
|
||||||
|
if (consumeData) {
|
||||||
|
// data has been written to file. Stream it to a new FlowFile.
|
||||||
|
FlowFile flowFile = session.create();
|
||||||
|
final RandomAccessFile fileReader = reader;
|
||||||
|
final LongHolder positionHolder = new LongHolder(position);
|
||||||
|
flowFile = session.write(flowFile, new OutputStreamCallback() {
|
||||||
|
@Override
|
||||||
|
public void process(final OutputStream rawOut) throws IOException {
|
||||||
|
try (final OutputStream out = new BufferedOutputStream(rawOut)) {
|
||||||
|
positionHolder.set(readLines(fileReader, currentState.getBuffer(), out, chksum));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
});
|
||||||
|
|
||||||
|
// If there ended up being no data, just remove the FlowFile
|
||||||
|
if (flowFile.getSize() == 0) {
|
||||||
|
session.remove(flowFile);
|
||||||
|
} else {
|
||||||
|
// determine filename for FlowFile by using <base filename of log file>.<initial offset>-<final offset>.<extension>
|
||||||
|
final String tailFilename = file.getName();
|
||||||
|
final String baseName = StringUtils.substringBeforeLast(tailFilename, ".");
|
||||||
|
final String flowFileName;
|
||||||
|
if (baseName.length() < tailFilename.length()) {
|
||||||
|
flowFileName = baseName + "." + position + "-" + positionHolder.get() + "." + StringUtils.substringAfterLast(tailFilename, ".");
|
||||||
|
} else {
|
||||||
|
flowFileName = baseName + "." + position + "-" + positionHolder.get();
|
||||||
|
}
|
||||||
|
|
||||||
|
final Map<String, String> attributes = new HashMap<>(2);
|
||||||
|
attributes.put(CoreAttributes.FILENAME.key(), flowFileName);
|
||||||
|
attributes.put(CoreAttributes.MIME_TYPE.key(), "text/plain");
|
||||||
|
flowFile = session.putAllAttributes(flowFile, attributes);
|
||||||
|
|
||||||
|
session.getProvenanceReporter().receive(flowFile, file.toURI().toString(), "FlowFile contains bytes " + position + " through " + positionHolder.get() + " of source file",
|
||||||
|
TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startNanos));
|
||||||
|
session.transfer(flowFile, REL_SUCCESS);
|
||||||
|
position = positionHolder.get();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// Create a new state object to represent our current position, timestamp, etc.
|
||||||
|
timestamp = System.currentTimeMillis();
|
||||||
|
final TailFileState updatedState = new TailFileState(context.getProperty(FILENAME).getValue(), file, reader, position, timestamp, checksum, state.getBuffer());
|
||||||
|
this.state = updatedState;
|
||||||
|
|
||||||
|
if (!consumeData) {
|
||||||
|
// no data to consume so rather than continually running, yield to allow other processors to use the thread.
|
||||||
|
// In this case, the state should not have changed, and we will have created no FlowFiles, so we don't have to
|
||||||
|
// persist the state or commit the session; instead, just return here.
|
||||||
|
context.yield();
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
// We must commit session before persisting state in order to avoid data loss on restart
|
||||||
|
session.commit();
|
||||||
|
final String stateFilename = context.getProperty(STATE_FILE).getValue();
|
||||||
|
try {
|
||||||
|
persistState(updatedState, stateFilename);
|
||||||
|
} catch (final IOException e) {
|
||||||
|
getLogger().warn("Failed to update state file {} due to {}; some data may be duplicated on restart of NiFi", new Object[] {stateFilename, e});
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Read new lines from the given RandomAccessFile, copying it to the given Output Stream. The Checksum is used in order to later determine whether or not
|
||||||
|
* data has been consumed.
|
||||||
|
*
|
||||||
|
* @param reader The RandomAccessFile to read data from
|
||||||
|
* @param buffer the buffer to use for copying data
|
||||||
|
* @param out the OutputStream to copy the data to
|
||||||
|
* @param checksum the Checksum object to use in order to calculate checksum for recovery purposes
|
||||||
|
*
|
||||||
|
* @return The new position after the lines have been read
|
||||||
|
* @throws java.io.IOException if an I/O error occurs.
|
||||||
|
*/
|
||||||
|
private long readLines(final RandomAccessFile reader, final byte[] buffer, final OutputStream out, final Checksum checksum) throws IOException {
|
||||||
|
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
|
||||||
|
long pos = reader.getFilePointer();
|
||||||
|
long rePos = pos; // position to re-read
|
||||||
|
|
||||||
|
int num;
|
||||||
|
boolean seenCR = false;
|
||||||
|
while (((num = reader.read(buffer)) != -1)) {
|
||||||
|
for (int i = 0; i < num; i++) {
|
||||||
|
byte ch = buffer[i];
|
||||||
|
|
||||||
|
switch (ch) {
|
||||||
|
case '\n':
|
||||||
|
baos.write(ch);
|
||||||
|
seenCR = false;
|
||||||
|
baos.writeTo(out);
|
||||||
|
baos.reset();
|
||||||
|
rePos = pos + i + 1;
|
||||||
|
break;
|
||||||
|
case '\r':
|
||||||
|
baos.write(ch);
|
||||||
|
seenCR = true;
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
if (seenCR) {
|
||||||
|
seenCR = false;
|
||||||
|
baos.writeTo(out);
|
||||||
|
baos.reset();
|
||||||
|
baos.write(ch);
|
||||||
|
rePos = pos + i;
|
||||||
|
} else {
|
||||||
|
baos.write(ch);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
checksum.update(buffer, 0, num);
|
||||||
|
pos = reader.getFilePointer();
|
||||||
|
}
|
||||||
|
|
||||||
|
reader.seek(rePos); // Ensure we can re-read if necessary
|
||||||
|
return rePos;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Returns a list of all Files that match the following criteria:
|
||||||
|
*
|
||||||
|
* <ul>
|
||||||
|
* <li>Filename matches the Rolling Filename Pattern</li>
|
||||||
|
* <li>Filename does not match the actual file being tailed</li>
|
||||||
|
* <li>The Last Modified Time on the file is equal to or later than the given minimum timestamp</li>
|
||||||
|
* </ul>
|
||||||
|
*
|
||||||
|
* <p>
|
||||||
|
* The List that is returned will be ordered by file timestamp, providing the oldest file first.
|
||||||
|
* </p>
|
||||||
|
*
|
||||||
|
* @param context the ProcessContext to use in order to determine Processor configuration
|
||||||
|
* @param minTimestamp any file with a Last Modified Time before this timestamp will not be returned
|
||||||
|
* @return a list of all Files that have rolled over
|
||||||
|
* @throws IOException if unable to perform the listing of files
|
||||||
|
*/
|
||||||
|
private List<File> getRolledOffFiles(final ProcessContext context, final long minTimestamp) throws IOException {
|
||||||
|
final String tailFilename = context.getProperty(FILENAME).getValue();
|
||||||
|
final File tailFile = new File(tailFilename);
|
||||||
|
File directory = tailFile.getParentFile();
|
||||||
|
if (directory == null) {
|
||||||
|
directory = new File(".");
|
||||||
|
}
|
||||||
|
|
||||||
|
final String rollingPattern = context.getProperty(ROLLING_FILENAME_PATTERN).getValue();
|
||||||
|
if (rollingPattern == null) {
|
||||||
|
return Collections.emptyList();
|
||||||
|
}
|
||||||
|
|
||||||
|
final List<File> rolledOffFiles = new ArrayList<>();
|
||||||
|
final DirectoryStream<Path> dirStream = Files.newDirectoryStream(directory.toPath(), rollingPattern);
|
||||||
|
for (final Path path : dirStream) {
|
||||||
|
final File file = path.toFile();
|
||||||
|
if (file.lastModified() < minTimestamp || file.equals(tailFile)) {
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
|
rolledOffFiles.add(file);
|
||||||
|
}
|
||||||
|
|
||||||
|
// Sort files based on last modified timestamp. If same timestamp, use filename as a secondary sort, as often
|
||||||
|
// files that are rolled over are given a naming scheme that is lexicographically sort in the same order as the
|
||||||
|
// timestamp, such as yyyy-MM-dd-HH-mm-ss
|
||||||
|
Collections.sort(rolledOffFiles, new Comparator<File>() {
|
||||||
|
@Override
|
||||||
|
public int compare(final File o1, final File o2) {
|
||||||
|
final int lastModifiedComp = Long.compare(o1.lastModified(), o2.lastModified());
|
||||||
|
if (lastModifiedComp != 0) {
|
||||||
|
return lastModifiedComp;
|
||||||
|
}
|
||||||
|
|
||||||
|
return o1.getName().compareTo(o2.getName());
|
||||||
|
}
|
||||||
|
});
|
||||||
|
|
||||||
|
return rolledOffFiles;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
* A simple Java class to hold information about our state so that we can maintain this state across multiple invocations of the Processor
|
||||||
|
*/
|
||||||
|
static class TailFileState {
|
||||||
|
private final String filename; // hold onto filename and not just File because we want to match that against the user-defined filename to recover from
|
||||||
|
private final File file;
|
||||||
|
private final RandomAccessFile raf;
|
||||||
|
private final long position;
|
||||||
|
private final long timestamp;
|
||||||
|
private final Checksum checksum;
|
||||||
|
private final byte[] buffer;
|
||||||
|
|
||||||
|
public TailFileState(final String filename, final File file, final RandomAccessFile raf, final long position, final long timestamp, final Checksum checksum, final byte[] buffer) {
|
||||||
|
this.filename = filename;
|
||||||
|
this.file = file;
|
||||||
|
this.raf = raf;
|
||||||
|
this.position = position;
|
||||||
|
this.timestamp = (timestamp / 1000) * 1000; // many operating systems will use only second-level precision for last-modified times so cut off milliseconds
|
||||||
|
this.checksum = checksum;
|
||||||
|
this.buffer = buffer;
|
||||||
|
}
|
||||||
|
|
||||||
|
public String getFilename() {
|
||||||
|
return filename;
|
||||||
|
}
|
||||||
|
|
||||||
|
public File getFile() {
|
||||||
|
return file;
|
||||||
|
}
|
||||||
|
|
||||||
|
public RandomAccessFile getReader() {
|
||||||
|
return raf;
|
||||||
|
}
|
||||||
|
|
||||||
|
public long getPosition() {
|
||||||
|
return position;
|
||||||
|
}
|
||||||
|
|
||||||
|
public long getTimestamp() {
|
||||||
|
return timestamp;
|
||||||
|
}
|
||||||
|
|
||||||
|
public Checksum getChecksum() {
|
||||||
|
return checksum;
|
||||||
|
}
|
||||||
|
|
||||||
|
public byte[] getBuffer() {
|
||||||
|
return buffer;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
@ -65,6 +65,7 @@ org.apache.nifi.processors.standard.SplitContent
|
||||||
org.apache.nifi.processors.standard.SplitJson
|
org.apache.nifi.processors.standard.SplitJson
|
||||||
org.apache.nifi.processors.standard.SplitText
|
org.apache.nifi.processors.standard.SplitText
|
||||||
org.apache.nifi.processors.standard.SplitXml
|
org.apache.nifi.processors.standard.SplitXml
|
||||||
|
org.apache.nifi.processors.standard.TailFile
|
||||||
org.apache.nifi.processors.standard.TransformXml
|
org.apache.nifi.processors.standard.TransformXml
|
||||||
org.apache.nifi.processors.standard.UnpackContent
|
org.apache.nifi.processors.standard.UnpackContent
|
||||||
org.apache.nifi.processors.standard.ValidateXml
|
org.apache.nifi.processors.standard.ValidateXml
|
||||||
|
|
|
||||||
|
|
@ -0,0 +1,205 @@
|
||||||
|
/*
|
||||||
|
* 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 static org.junit.Assert.assertEquals;
|
||||||
|
import static org.junit.Assert.assertNotNull;
|
||||||
|
import static org.junit.Assert.assertTrue;
|
||||||
|
|
||||||
|
import java.io.File;
|
||||||
|
import java.io.FilenameFilter;
|
||||||
|
import java.io.IOException;
|
||||||
|
import java.io.RandomAccessFile;
|
||||||
|
|
||||||
|
import org.apache.nifi.processors.standard.TailFile.TailFileState;
|
||||||
|
import org.apache.nifi.util.TestRunner;
|
||||||
|
import org.apache.nifi.util.TestRunners;
|
||||||
|
import org.junit.After;
|
||||||
|
import org.junit.Assert;
|
||||||
|
import org.junit.Before;
|
||||||
|
import org.junit.Test;
|
||||||
|
|
||||||
|
public class TestTailFile {
|
||||||
|
private File file;
|
||||||
|
private RandomAccessFile raf;
|
||||||
|
private TestRunner runner;
|
||||||
|
|
||||||
|
@Before
|
||||||
|
public void setup() throws IOException {
|
||||||
|
final File targetDir = new File("target");
|
||||||
|
final File[] files = targetDir.listFiles(new FilenameFilter() {
|
||||||
|
@Override
|
||||||
|
public boolean accept(final File dir, final String name) {
|
||||||
|
return name.startsWith("log");
|
||||||
|
}
|
||||||
|
});
|
||||||
|
|
||||||
|
for (final File file : files) {
|
||||||
|
file.delete();
|
||||||
|
}
|
||||||
|
|
||||||
|
file = new File("target/log.txt");
|
||||||
|
file.delete();
|
||||||
|
assertTrue(file.createNewFile());
|
||||||
|
|
||||||
|
final File stateFile = new File("target/tail-file.state");
|
||||||
|
stateFile.delete();
|
||||||
|
Assert.assertFalse(stateFile.exists());
|
||||||
|
|
||||||
|
runner = TestRunners.newTestRunner(new TailFile());
|
||||||
|
runner.setProperty(TailFile.FILENAME, "target/log.txt");
|
||||||
|
runner.setProperty(TailFile.STATE_FILE, "target/tail-file.state");
|
||||||
|
runner.assertValid();
|
||||||
|
|
||||||
|
raf = new RandomAccessFile(file, "rw");
|
||||||
|
}
|
||||||
|
|
||||||
|
@After
|
||||||
|
public void cleanup() throws IOException {
|
||||||
|
if (raf != null) {
|
||||||
|
raf.close();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testConsumeAfterTruncation() throws IOException {
|
||||||
|
runner.run();
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 0);
|
||||||
|
|
||||||
|
raf.write("hello\n".getBytes());
|
||||||
|
runner.run();
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 1);
|
||||||
|
runner.getFlowFilesForRelationship(TailFile.REL_SUCCESS).get(0).assertContentEquals("hello\n");
|
||||||
|
runner.clearTransferState();
|
||||||
|
|
||||||
|
// truncate and then write same number of bytes
|
||||||
|
raf.setLength(0L);
|
||||||
|
runner.run();
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 0);
|
||||||
|
raf.write("HELLO\n".getBytes());
|
||||||
|
|
||||||
|
runner.run();
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 1);
|
||||||
|
runner.getFlowFilesForRelationship(TailFile.REL_SUCCESS).get(0).assertContentEquals("HELLO\n");
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testRemainderOfFileRecoveredAfterRestart() throws IOException {
|
||||||
|
runner.setProperty(TailFile.ROLLING_FILENAME_PATTERN, "log*.txt");
|
||||||
|
runner.run();
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 0);
|
||||||
|
|
||||||
|
raf.write("hello\n".getBytes());
|
||||||
|
runner.run();
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 1);
|
||||||
|
runner.getFlowFilesForRelationship(TailFile.REL_SUCCESS).get(0).assertContentEquals("hello\n");
|
||||||
|
runner.clearTransferState();
|
||||||
|
|
||||||
|
raf.write("world".getBytes());
|
||||||
|
raf.close();
|
||||||
|
file.renameTo(new File("target/log1.txt"));
|
||||||
|
|
||||||
|
raf = new RandomAccessFile(new File("target/log.txt"), "rw");
|
||||||
|
raf.write("new file\n".getBytes());
|
||||||
|
runner.run();
|
||||||
|
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 2);
|
||||||
|
runner.getFlowFilesForRelationship(TailFile.REL_SUCCESS).get(0).assertContentEquals("world");
|
||||||
|
runner.getFlowFilesForRelationship(TailFile.REL_SUCCESS).get(1).assertContentEquals("new file\n");
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testRemainderOfFileRecoveredIfRolledOverWhileRunning() throws IOException {
|
||||||
|
// this mimics the case when we are reading a log file that rolls over while processor is running.
|
||||||
|
runner.setProperty(TailFile.ROLLING_FILENAME_PATTERN, "log*.txt");
|
||||||
|
runner.run(1, false, false);
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 0);
|
||||||
|
|
||||||
|
raf.write("hello\n".getBytes());
|
||||||
|
runner.run(1, false, false);
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 1);
|
||||||
|
runner.getFlowFilesForRelationship(TailFile.REL_SUCCESS).get(0).assertContentEquals("hello\n");
|
||||||
|
runner.clearTransferState();
|
||||||
|
|
||||||
|
raf.write("world".getBytes());
|
||||||
|
raf.close();
|
||||||
|
file.renameTo(new File("target/log1.txt"));
|
||||||
|
|
||||||
|
raf = new RandomAccessFile(new File("target/log.txt"), "rw");
|
||||||
|
raf.write("1\n".getBytes());
|
||||||
|
runner.run(1, false, false);
|
||||||
|
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 2);
|
||||||
|
runner.getFlowFilesForRelationship(TailFile.REL_SUCCESS).get(0).assertContentEquals("world");
|
||||||
|
runner.getFlowFilesForRelationship(TailFile.REL_SUCCESS).get(1).assertContentEquals("1\n");
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void testConsumeWhenNewLineFound() throws IOException, InterruptedException {
|
||||||
|
runner.run();
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 0);
|
||||||
|
|
||||||
|
final long start = System.currentTimeMillis();
|
||||||
|
Thread.sleep(1100L);
|
||||||
|
|
||||||
|
raf.write("Hello, World".getBytes());
|
||||||
|
runner.run();
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 0);
|
||||||
|
|
||||||
|
raf.write("\r\n".getBytes());
|
||||||
|
runner.run();
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 1);
|
||||||
|
|
||||||
|
final TailFileState state = ((TailFile) runner.getProcessor()).getState();
|
||||||
|
assertNotNull(state);
|
||||||
|
assertEquals("target/log.txt", state.getFilename());
|
||||||
|
assertTrue(state.getTimestamp() <= System.currentTimeMillis());
|
||||||
|
assertTrue(state.getTimestamp() >= start);
|
||||||
|
assertEquals(14, state.getPosition());
|
||||||
|
runner.getFlowFilesForRelationship(TailFile.REL_SUCCESS).get(0).assertContentEquals("Hello, World\r\n");
|
||||||
|
|
||||||
|
runner.clearTransferState();
|
||||||
|
|
||||||
|
raf.write("12345".getBytes());
|
||||||
|
runner.run();
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 0);
|
||||||
|
|
||||||
|
raf.write("\n".getBytes());
|
||||||
|
runner.run();
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 1);
|
||||||
|
runner.getFlowFilesForRelationship(TailFile.REL_SUCCESS).get(0).assertContentEquals("12345\n");
|
||||||
|
|
||||||
|
runner.clearTransferState();
|
||||||
|
raf.write("carriage\rreturn\r".getBytes());
|
||||||
|
runner.run();
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 1);
|
||||||
|
runner.getFlowFilesForRelationship(TailFile.REL_SUCCESS).get(0).assertContentEquals("carriage\r");
|
||||||
|
|
||||||
|
runner.clearTransferState();
|
||||||
|
raf.write("\r\n".getBytes());
|
||||||
|
runner.run();
|
||||||
|
runner.assertAllFlowFilesTransferred(TailFile.REL_SUCCESS, 1);
|
||||||
|
runner.getFlowFilesForRelationship(TailFile.REL_SUCCESS).get(0).assertContentEquals("return\r\r\n");
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
|
|
@ -22,6 +22,21 @@
|
||||||
</encoder>
|
</encoder>
|
||||||
</appender>
|
</appender>
|
||||||
|
|
||||||
|
<appender name="TARGET_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
|
||||||
|
<file>target/log.txt</file>
|
||||||
|
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
|
||||||
|
<fileNamePattern>target/log_%d{yyyy-MM-dd_HH}.%i.txt</fileNamePattern>
|
||||||
|
<timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
|
||||||
|
<maxFileSize>10KB</maxFileSize>
|
||||||
|
</timeBasedFileNamingAndTriggeringPolicy>
|
||||||
|
<!-- keep 30 log files worth of history -->
|
||||||
|
<maxHistory>30</maxHistory>
|
||||||
|
</rollingPolicy>
|
||||||
|
<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
|
||||||
|
<pattern>%date %level [%thread] %logger{40} %msg%n</pattern>
|
||||||
|
<immediateFlush>true</immediateFlush>
|
||||||
|
</encoder>
|
||||||
|
</appender>
|
||||||
<!-- valid logging levels: TRACE, DEBUG, INFO, WARN, ERROR -->
|
<!-- valid logging levels: TRACE, DEBUG, INFO, WARN, ERROR -->
|
||||||
<logger name="org.apache.nifi" level="INFO"/>
|
<logger name="org.apache.nifi" level="INFO"/>
|
||||||
|
|
||||||
|
|
@ -41,6 +56,9 @@
|
||||||
<logger name="com.sun.jersey.spi.container.servlet.WebComponent" level="ERROR"/>
|
<logger name="com.sun.jersey.spi.container.servlet.WebComponent" level="ERROR"/>
|
||||||
|
|
||||||
<logger name="org.apache.nifi.processors.standard" level="DEBUG"/>
|
<logger name="org.apache.nifi.processors.standard" level="DEBUG"/>
|
||||||
|
<logger name="target.file" level="DEBUG" additivity="true">
|
||||||
|
<appender-ref ref="TARGET_FILE" />
|
||||||
|
</logger>
|
||||||
|
|
||||||
<root level="INFO">
|
<root level="INFO">
|
||||||
<appender-ref ref="CONSOLE"/>
|
<appender-ref ref="CONSOLE"/>
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue