Github user olegz commented on a diff in the pull request: https://github.com/apache/nifi/pull/113#discussion_r43741070 --- Diff: nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/ListFile.java --- @@ -0,0 +1,378 @@ +/* + * 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 org.apache.nifi.annotation.behavior.TriggerSerially; +import org.apache.nifi.annotation.behavior.TriggerWhenEmpty; +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.processor.DataUnit; +import org.apache.nifi.processor.ProcessContext; +import org.apache.nifi.processor.ProcessorInitializationContext; +import org.apache.nifi.processor.Relationship; +import org.apache.nifi.processor.util.StandardValidators; +import org.apache.nifi.processors.standard.util.FileInfo; + +import java.io.File; +import java.io.FileFilter; +import java.io.IOException; +import java.nio.file.FileStore; +import java.nio.file.Files; +import java.nio.file.Path; +import java.nio.file.Paths; +import java.nio.file.attribute.BasicFileAttributeView; +import java.nio.file.attribute.BasicFileAttributes; +import java.nio.file.attribute.FileOwnerAttributeView; +import java.nio.file.attribute.PosixFileAttributeView; +import java.nio.file.attribute.PosixFilePermissions; +import java.text.DateFormat; +import java.text.SimpleDateFormat; +import java.util.ArrayList; +import java.util.Collections; +import java.util.Date; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Iterator; +import java.util.List; +import java.util.Locale; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicReference; +import java.util.regex.Pattern; + +@TriggerSerially +@TriggerWhenEmpty +@Tags({"file", "get", "list", "ingest", "source", "filesystem"}) +@CapabilityDescription("Retrieves a listing of files from the local filesystem. For each file that is listed, " + + "creates a FlowFile that represents the file so that it can be fetched in conjunction with ListFile. This " + + "Processor is designed to run on Primary Node only in a cluster. If the primary node changes, the new " + + "Primary Node will pick up where the previous node left off without duplicating all of the data. Unlike " + + "GetFile, this Processor does not delete any data from the local filesystem.") +@WritesAttributes({ + @WritesAttribute(attribute="filename", description="The name of the file that was read from filesystem."), + @WritesAttribute(attribute="path", description="The path is set to the absolute path of the file's directory " + + "on filesystem. For example, if the Directory property is set to /tmp, then files picked up from " + + "/tmp will have the path attribute set to \"./\". If the Recurse Subdirectories property is set to " + + "true and a file is picked up from /tmp/abc/1/2/3, then the path attribute will be set to " + + "\"/tmp/abc/1/2/3\"."), + @WritesAttribute(attribute="fs.owner", description="The user that owns the file in filesystem"), + @WritesAttribute(attribute="fs.group", description="The group that owns the file in filesystem"), + @WritesAttribute(attribute="fs.lastModified", description="The timestamp of when the file in filesystem was " + + "last modified, as milliseconds since midnight Jan 1, 1970 UTC"), + @WritesAttribute(attribute="fs.length", description="The number of bytes in the file in filesystem"), + @WritesAttribute(attribute="fs.permissions", description="The permissions for the file in filesystem. This " + + "is formatted as 3 characters for the owner, 3 for the group, and 3 for other users. For example " + + "rw-rw-r--") +}) +@SeeAlso({GetFile.class, PutFile.class}) +public class ListFile extends AbstractListProcessor<FileInfo> { + + public static final PropertyDescriptor DIRECTORY = new PropertyDescriptor.Builder() + .name("Input Directory") + .description("The input directory from which files to pull files") + .required(true) + .addValidator(StandardValidators.createDirectoryExistsValidator(true, false)) + .expressionLanguageSupported(true) + .build(); + + public static final PropertyDescriptor RECURSE = new PropertyDescriptor.Builder() + .name("Recurse Subdirectories") + .description("Indicates whether to list files from subdirectories of the directory") + .required(true) + .allowableValues("true", "false") + .defaultValue("true") + .build(); + + public static final PropertyDescriptor FILE_FILTER = new PropertyDescriptor.Builder() + .name("File Filter") + .description("Only files whose names match the given regular expression will be picked up") + .required(true) + .defaultValue("[^\\.].*") + .addValidator(StandardValidators.REGULAR_EXPRESSION_VALIDATOR) + .build(); + + public static final PropertyDescriptor PATH_FILTER = new PropertyDescriptor.Builder() + .name("Path Filter") + .description("When " + RECURSE.getName() + " is true, then only subdirectories whose path matches the given regular expression will be scanned") + .required(false) + .addValidator(StandardValidators.REGULAR_EXPRESSION_VALIDATOR) + .build(); + + + public static final PropertyDescriptor MIN_AGE = new PropertyDescriptor.Builder() + .name("Minimum File Age") + .description("The minimum age that a file must be in order to be pulled; any file younger than this amount of time (according to last modification date) will be ignored") + .required(true) + .addValidator(StandardValidators.TIME_PERIOD_VALIDATOR) + .defaultValue("0 sec") + .build(); + + public static final PropertyDescriptor MAX_AGE = new PropertyDescriptor.Builder() + .name("Maximum File Age") + .description("The maximum age that a file must be in order to be pulled; any file older than this amount of time (according to last modification date) will be ignored") + .required(false) + .addValidator(StandardValidators.createTimePeriodValidator(100, TimeUnit.MILLISECONDS, Long.MAX_VALUE, TimeUnit.NANOSECONDS)) + .build(); + + public static final PropertyDescriptor MIN_SIZE = new PropertyDescriptor.Builder() + .name("Minimum File Size") + .description("The minimum size that a file must be in order to be pulled") + .required(true) + .addValidator(StandardValidators.DATA_SIZE_VALIDATOR) + .defaultValue("0 B") + .build(); + + public static final PropertyDescriptor MAX_SIZE = new PropertyDescriptor.Builder() + .name("Maximum File Size") + .description("The maximum size that a file can be in order to be pulled") + .required(false) + .addValidator(StandardValidators.DATA_SIZE_VALIDATOR) + .build(); + + public static final PropertyDescriptor IGNORE_HIDDEN_FILES = new PropertyDescriptor.Builder() + .name("Ignore Hidden Files") + .description("Indicates whether or not hidden files should be ignored") + .allowableValues("true", "false") + .defaultValue("true") + .required(true) + .build(); + + private List<PropertyDescriptor> properties; + private Set<Relationship> relationships; + private final AtomicReference<FileFilter> fileFilterRef = new AtomicReference<>(); + + public static final String FILE_CREATION_TIME_ATTRIBUTE = "file.creationTime"; + public static final String FILE_LAST_MODIFY_TIME_ATTRIBUTE = "file.lastModifiedTime"; + public static final String FILE_LAST_ACCESS_TIME_ATTRIBUTE = "file.lastAccessTime"; + public static final String FILE_SIZE_ATTRIBUTE = "file.size"; + public static final String FILE_OWNER_ATTRIBUTE = "file.owner"; + public static final String FILE_GROUP_ATTRIBUTE = "file.group"; + public static final String FILE_PERMISSIONS_ATTRIBUTE = "file.permissions"; + public static final String FILE_MODIFY_DATE_ATTR_FORMAT = "yyyy-MM-dd'T'HH:mm:ssZ"; + + @Override + protected void init(final ProcessorInitializationContext context) { + final List<PropertyDescriptor> properties = new ArrayList<>(); + properties.add(DIRECTORY); + properties.add(RECURSE); + properties.add(FILE_FILTER); + properties.add(PATH_FILTER); + properties.add(MIN_AGE); + properties.add(MAX_AGE); + properties.add(MIN_SIZE); + properties.add(MAX_SIZE); + properties.add(IGNORE_HIDDEN_FILES); + this.properties = Collections.unmodifiableList(properties); + + final Set<Relationship> relationships = new HashSet<>(); + relationships.add(REL_SUCCESS); + this.relationships = Collections.unmodifiableSet(relationships); + } + + @Override + protected List<PropertyDescriptor> getSupportedPropertyDescriptors() { + return properties; + } + + @Override + public Set<Relationship> getRelationships() { + return relationships; + } + + @OnScheduled + public void onScheduled(final ProcessContext context) { + fileFilterRef.set(createFileFilter(context)); + } + + @Override + protected Map<String, String> createAttributes(final FileInfo fileInfo, final ProcessContext context) { + final Map<String, String> attributes = new HashMap<>(); + + final String fullPath = fileInfo.getFullPathFileName(); + final File file = new File(fullPath); + final Path filePath = file.toPath(); + final Path directoryPath = new File(getPath(context)).toPath(); + + final Path relativePath = directoryPath.relativize(filePath.getParent()); + String relativePathString = relativePath.toString() + "/"; + if (relativePathString.isEmpty()) { + relativePathString = "./"; + } + final Path absPath = filePath.toAbsolutePath(); + final String absPathString = absPath.getParent().toString() + "/"; + + attributes.put(CoreAttributes.PATH.key(), relativePathString); + attributes.put(CoreAttributes.FILENAME.key(), fileInfo.getFileName()); + attributes.put(CoreAttributes.ABSOLUTE_PATH.key(), absPathString); + + try { + FileStore store = Files.getFileStore(filePath); + if (store.supportsFileAttributeView("basic")) { + try { + final DateFormat formatter = new SimpleDateFormat(FILE_MODIFY_DATE_ATTR_FORMAT, Locale.US); + BasicFileAttributeView view = Files.getFileAttributeView(filePath, BasicFileAttributeView.class); + BasicFileAttributes attrs = view.readAttributes(); + attributes.put(FILE_SIZE_ATTRIBUTE, Long.toString(attrs.size())); + attributes.put(FILE_LAST_MODIFY_TIME_ATTRIBUTE, formatter.format(new Date(attrs.lastModifiedTime().toMillis()))); + attributes.put(FILE_CREATION_TIME_ATTRIBUTE, formatter.format(new Date(attrs.creationTime().toMillis()))); + attributes.put(FILE_LAST_ACCESS_TIME_ATTRIBUTE, formatter.format(new Date(attrs.lastAccessTime().toMillis()))); + } catch (Exception ignore) { + } // allow other attributes if these fail + } + if (store.supportsFileAttributeView("owner")) { + try { + FileOwnerAttributeView view = Files.getFileAttributeView(filePath, FileOwnerAttributeView.class); + attributes.put(FILE_OWNER_ATTRIBUTE, view.getOwner().getName()); + } catch (Exception ignore) { + } // allow other attributes if these fail + } + if (store.supportsFileAttributeView("posix")) { + try { + PosixFileAttributeView view = Files.getFileAttributeView(filePath, PosixFileAttributeView.class); + attributes.put(FILE_PERMISSIONS_ATTRIBUTE, PosixFilePermissions.toString(view.readAttributes().permissions())); + attributes.put(FILE_GROUP_ATTRIBUTE, view.readAttributes().group().getName()); + } catch (Exception ignore) { + } // allow other attributes if these fail + } + } catch (IOException ioe) { + // well then this FlowFile gets none of these attributes + } + + return attributes; + } + + @Override + protected String getPath(final ProcessContext context) { + return context.getProperty(DIRECTORY).evaluateAttributeExpressions().getValue(); + } + + @Override + protected List<FileInfo> performListing(final ProcessContext context, final Long minTimestamp) throws IOException { + final File path = new File(getPath(context)); + final Boolean recurse = context.getProperty(RECURSE).asBoolean(); + return scanDirectory(path, fileFilterRef.get(), recurse, minTimestamp); + } + + @Override + protected boolean isListingResetNecessary(final PropertyDescriptor property) { + return DIRECTORY.equals(property) + || RECURSE.equals(property) + || FILE_FILTER.equals(property) + || PATH_FILTER.equals(property) + || MIN_AGE.equals(property) + || MAX_AGE.equals(property) + || MIN_SIZE.equals(property) + || MAX_SIZE.equals(property) + || IGNORE_HIDDEN_FILES.equals(property); + } + + private List<FileInfo> scanDirectory(final File path, final FileFilter filter, final Boolean recurse, + final Long minTimestamp) throws IOException { + final List<FileInfo> listing = new ArrayList<>(); + File[] files = path.listFiles(); + if (files != null) { + for (File file : files) { + if (file.isDirectory()) { + if (recurse) { + listing.addAll(scanDirectory(file, filter, true, minTimestamp)); + } + } else { + if (filter.accept(file)) { + listing.add(new FileInfo.Builder() + .directory(file.isDirectory()) + .filename(file.getName()) + .fullPathFileName(file.getAbsolutePath()) + .lastModifiedTime(file.lastModified()) + .build()); + } + } + } + } + if (minTimestamp == null) { + return listing; + } + + final Iterator<FileInfo> itr = listing.iterator(); + while (itr.hasNext()) { + final FileInfo next = itr.next(); + if (next.getLastModifiedTime() < minTimestamp) { + itr.remove(); + } + } + + return listing; + } + + private FileFilter createFileFilter(final ProcessContext context) { + final long minSize = context.getProperty(MIN_SIZE).asDataSize(DataUnit.B).longValue(); + final Double maxSize = context.getProperty(MAX_SIZE).asDataSize(DataUnit.B); + final long minAge = context.getProperty(MIN_AGE).asTimePeriod(TimeUnit.MILLISECONDS); + final Long maxAge = context.getProperty(MAX_AGE).asTimePeriod(TimeUnit.MILLISECONDS); + final boolean ignoreHidden = context.getProperty(IGNORE_HIDDEN_FILES).asBoolean(); + final Pattern filePattern = Pattern.compile(context.getProperty(FILE_FILTER).getValue()); + final String indir = context.getProperty(DIRECTORY).evaluateAttributeExpressions().getValue(); + final boolean recurseDirs = context.getProperty(RECURSE).asBoolean(); + final String pathPatternStr = context.getProperty(PATH_FILTER).getValue(); + final Pattern pathPattern = (!recurseDirs || pathPatternStr == null) ? null : Pattern.compile(pathPatternStr); + + return new FileFilter() { + @Override + public boolean accept(final File file) { + if (minSize > file.length()) { + return false; + } + if (maxSize != null && maxSize < file.length()) { + return false; + } + final long fileAge = System.currentTimeMillis() - file.lastModified(); + if (minAge > fileAge) { + return false; + } + if (maxAge != null && maxAge < fileAge) { + return false; + } + if (ignoreHidden && file.isHidden()) { + return false; + } + if (pathPattern != null) { + Path reldir = Paths.get(indir).relativize(file.toPath()).getParent(); + System.out.println("reldir=" + reldir + " pathPatternStr=" + pathPatternStr + " file=" + file.getName()); --- End diff -- Should this be LOG instead of System.out?
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