/*
* Copyright (C) 2018 Google LLC
*
* Licensed 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 com.google.cloud.teleport.templates;
import com.google.api.services.bigquery.model.TableCell;
import com.google.api.services.bigquery.model.TableFieldSchema;
import com.google.api.services.bigquery.model.TableRow;
import com.google.api.services.bigquery.model.TableSchema;
import com.google.cloud.dlp.v2.DlpServiceClient;
import com.google.cloud.teleport.metadata.Template;
import com.google.cloud.teleport.metadata.TemplateCategory;
import com.google.cloud.teleport.metadata.TemplateParameter;
import com.google.cloud.teleport.templates.DLPTextToBigQueryStreaming.TokenizePipelineOptions;
import com.google.privacy.dlp.v2.ContentItem;
import com.google.privacy.dlp.v2.DeidentifyContentRequest;
import com.google.privacy.dlp.v2.DeidentifyContentRequest.Builder;
import com.google.privacy.dlp.v2.DeidentifyContentResponse;
import com.google.privacy.dlp.v2.FieldId;
import com.google.privacy.dlp.v2.ProjectName;
import com.google.privacy.dlp.v2.Table;
import com.google.privacy.dlp.v2.Value;
import java.io.BufferedReader;
import java.io.IOException;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.charset.StandardCharsets;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import org.apache.beam.runners.dataflow.options.DataflowPipelineOptions;
import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.PipelineResult;
import org.apache.beam.sdk.coders.KvCoder;
import org.apache.beam.sdk.coders.StringUtf8Coder;
import org.apache.beam.sdk.io.Compression;
import org.apache.beam.sdk.io.FileIO;
import org.apache.beam.sdk.io.FileIO.ReadableFile;
import org.apache.beam.sdk.io.ReadableFileCoder;
import org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO;
import org.apache.beam.sdk.io.gcp.bigquery.DynamicDestinations;
import org.apache.beam.sdk.io.gcp.bigquery.InsertRetryPolicy;
import org.apache.beam.sdk.io.gcp.bigquery.TableDestination;
import org.apache.beam.sdk.io.range.OffsetRange;
import org.apache.beam.sdk.metrics.Distribution;
import org.apache.beam.sdk.metrics.Metrics;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
import org.apache.beam.sdk.options.Validation.Required;
import org.apache.beam.sdk.options.ValueProvider;
import org.apache.beam.sdk.options.ValueProvider.NestedValueProvider;
import org.apache.beam.sdk.transforms.DoFn;
import org.apache.beam.sdk.transforms.GroupByKey;
import org.apache.beam.sdk.transforms.ParDo;
import org.apache.beam.sdk.transforms.Watch;
import org.apache.beam.sdk.transforms.WithKeys;
import org.apache.beam.sdk.transforms.splittabledofn.OffsetRangeTracker;
import org.apache.beam.sdk.transforms.splittabledofn.RestrictionTracker;
import org.apache.beam.sdk.transforms.windowing.AfterProcessingTime;
import org.apache.beam.sdk.transforms.windowing.FixedWindows;
import org.apache.beam.sdk.transforms.windowing.Repeatedly;
import org.apache.beam.sdk.transforms.windowing.Window;
import org.apache.beam.sdk.values.KV;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.PCollectionView;
import org.apache.beam.sdk.values.ValueInSingleWindow;
import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVRecord;
import org.joda.time.Duration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The {@link DLPTextToBigQueryStreaming} is a streaming pipeline that reads CSV files from a
* storage location (e.g. Google Cloud Storage), uses Cloud DLP API to inspect, classify, and mask
* sensitive information (e.g. PII Data like passport or SIN number) and at the end stores
* obfuscated data in BigQuery (Dynamic Table Creation) to be used for various purposes. e.g. data
* analytics, ML model. Cloud DLP inspection and masking can be configured by the user and can make
* use of over 90 built in detectors and masking techniques like tokenization, secure hashing, date
* shifting, partial masking, and more.
*
* <p><b>Pipeline Requirements</b>
*
* <ul>
* <li>DLP Templates exist (e.g. deidentifyTemplate, InspectTemplate)
* <li>The BigQuery Dataset exists
* </ul>
*
* <p>Check out <a
* href="https://github.com/GoogleCloudPlatform/DataflowTemplates/blob/main/v1/README_Stream_DLP_GCS_Text_to_BigQuery.md">README</a>
* for instructions on how to use or modify this template.
*/
@Template(
name = "Stream_DLP_GCS_Text_to_BigQuery",
category = TemplateCategory.STREAMING,
displayName = "Data Masking/Tokenization from Cloud Storage to BigQuery (using Cloud DLP)",
description = {
"The Data Masking/Tokenization from Cloud Storage to BigQuery template uses <a href=\"https://cloud.google.com/dlp/docs\">Sensitive Data Protection</a> and creates a streaming pipeline that does the following steps:\n"
+ "1. Reads CSV files from a Cloud Storage bucket.\n"
+ "2. Calls the Cloud Data Loss Prevention API (part of Sensitive Data Protection) for de-identification.\n"
+ "3. Writes the de-identified data into the specified BigQuery table.",
"The template supports using both a Sensitive Data Protection <a href=\"https://cloud.google.com/dlp/docs/creating-templates\">inspection template</a> and a Sensitive Data Protection <a href=\"https://cloud.google.com/dlp/docs/creating-templates-deid\">de-identification template</a>. As a result, the template supports both of the following tasks:\n"
+ "- Inspect for potentially sensitive information and de-identify the data.\n"
+ "- De-identify structured data where columns are specified to be de-identified and no inspection is needed.",
"Note: This template does not support a regional path for de-identification template location. Only a global path is supported."
},
optionsClass = TokenizePipelineOptions.class,
documentation =
"https://cloud.google.com/dataflow/docs/guides/templates/provided/dlp-text-to-bigquery",
contactInformation = "https://cloud.google.com/support",
preview = true,
requirements = {
"The input data to tokenize must exist.",
"The Sensitive Data Protection templates must exist (for example, DeidentifyTemplate and InspectTemplate). For more details, see <a href=\"https://cloud.google.com/dlp/docs/concepts-templates\">Sensitive Data Protection templates</a>.",
"The BigQuery dataset must exist."
},
streaming = true,
hidden = true)
public class DLPTextToBigQueryStreaming {
public static final Logger LOG = LoggerFactory.getLogger(DLPTextToBigQueryStreaming.class);
/** Default interval for polling files in GCS. */
private static final Duration DEFAULT_POLL_INTERVAL = Duration.standardSeconds(30);
/** Expected only CSV file in GCS bucket. */
private static final String ALLOWED_FILE_EXTENSION = String.valueOf("csv");
/** Regular expression that matches valid BQ table IDs. */
private static final Pattern TABLE_REGEXP = Pattern.compile("[-\\w$@]{1,1024}");
/** Default batch size if value not provided in execution. */
private static final Integer DEFAULT_BATCH_SIZE = 100;
/** Regular expression that matches valid BQ column name . */
private static final Pattern COLUMN_NAME_REGEXP = Pattern.compile("^[A-Za-z_]+[A-Za-z_0-9]*$");
/** Default window interval to create side inputs for header records. */
private static final Duration WINDOW_INTERVAL = Duration.standardSeconds(30);
/**
* Main entry point for executing the pipeline. This will run the pipeline asynchronously. If
* blocking execution is required, use the {@link
* DLPTextToBigQueryStreaming#run(TokenizePipelineOptions)} method to start the pipeline and
* invoke {@code result.waitUntilFinish()} on the {@link PipelineResult}
*
* @param args The command-line arguments to the pipeline.
*/
public static void main(String[] args) {
TokenizePipelineOptions options =
PipelineOptionsFactory.fromArgs(args).withValidation().as(TokenizePipelineOptions.class);
run(options);
}
/**
* Runs the pipeline with the supplied options.
*
* @param options The execution parameters to the pipeline.
* @return The result of the pipeline execution.
*/
public static PipelineResult run(TokenizePipelineOptions options) {
// Create the pipeline
Pipeline p = Pipeline.create(options);
/*
* Steps:
* 1) Read from the text source continuously based on default interval e.g. 30 seconds
* - Setup a window for 30 secs to capture the list of files emitted.
* - Group by file name as key and ReadableFile as a value.
* 2) Output each readable file for content processing.
* 3) Split file contents based on batch size for parallel processing.
* 4) Process each split as a DLP table content request to invoke API.
* 5) Convert DLP Table Rows to BQ Table Row.
* 6) Create dynamic table and insert successfully converted records into BQ.
*/
PCollection<KV<String, Iterable<ReadableFile>>> csvFiles =
p
/*
* 1) Read from the text source continuously based on default interval e.g. 300 seconds
* - Setup a window for 30 secs to capture the list of files emitted.
* - Group by file name as key and ReadableFile as a value.
*/
.apply(
"Poll Input Files",
FileIO.match()
.filepattern(options.getInputFilePattern())
.continuously(DEFAULT_POLL_INTERVAL, Watch.Growth.never()))
.apply("Find Pattern Match", FileIO.readMatches().withCompression(Compression.AUTO))
.apply("Add File Name as Key", WithKeys.of(file -> getFileName(file)))
.setCoder(KvCoder.of(StringUtf8Coder.of(), ReadableFileCoder.of()))
.apply(
"Fixed Window(30 Sec)",
Window.<KV<String, ReadableFile>>into(FixedWindows.of(WINDOW_INTERVAL))
.triggering(
Repeatedly.forever(
AfterProcessingTime.pastFirstElementInPane()
.plusDelayOf(Duration.ZERO)))
.discardingFiredPanes()
.withAllowedLateness(Duration.ZERO))
.apply(GroupByKey.create());
PCollection<KV<String, TableRow>> bqDataMap =
csvFiles
// 2) Output each readable file for content processing.
.apply(
"File Handler",
ParDo.of(
new DoFn<KV<String, Iterable<ReadableFile>>, KV<String, ReadableFile>>() {
@ProcessElement
public void processElement(ProcessContext c) {
String fileKey = c.element().getKey();
c.element()
.getValue()
.forEach(
file -> {
c.output(KV.of(fileKey, file));
});
}
}))
// 3) Split file contents based on batch size for parallel processing.
.apply(
"Process File Contents",
ParDo.of(
new CSVReader(
NestedValueProvider.of(
options.getBatchSize(),
batchSize -> {
if (batchSize != null) {
return batchSize;
} else {
return DEFAULT_BATCH_SIZE;
}
}))))
// 4) Create a DLP Table content request and invoke DLP API for each processing
.apply(
"DLP-Tokenization",
ParDo.of(
new DLPTokenizationDoFn(
options.getDlpProjectId(),
options.getDeidentifyTemplateName(),
options.getInspectTemplateName())))
// 5) Convert DLP Table Rows to BQ Table Row
.apply("Process Tokenized Data", ParDo.of(new TableRowProcessorDoFn()));
// 6) Create dynamic table and insert successfully converted records into BQ.
bqDataMap.apply(
"Write To BQ",
BigQueryIO.<KV<String, TableRow>>write()
.to(new BQDestination(options.getDatasetName(), options.getDlpProjectId()))
.withFormatFunction(
element -> {
return element.getValue();
})
.withWriteDisposition(BigQueryIO.Write.WriteDisposition.WRITE_APPEND)
.withCreateDisposition(BigQueryIO.Write.CreateDisposition.CREATE_IF_NEEDED)
.withoutValidation()
.withFailedInsertRetryPolicy(InsertRetryPolicy.retryTransientErrors()));
return p.run();
}
/**
* The {@link TokenizePipelineOptions} interface provides the custom execution options passed by
* the executor at the command-line.
*/
public interface TokenizePipelineOptions extends DataflowPipelineOptions {
@TemplateParameter.GcsReadFile(
order = 1,
groupName = "Source",
description = "Input Cloud Storage File(s)",
helpText = "The CSV files to read input data records from. Wildcards are also accepted.",
example = "gs://mybucket/my_csv_filename.csv or gs://mybucket/file-*.csv")
ValueProvider<String> getInputFilePattern();
void setInputFilePattern(ValueProvider<String> value);
@TemplateParameter.Text(
order = 2,
groupName = "Source",
regexes = {
"^projects\\/[^\\n\\r\\/]+(\\/locations\\/[^\\n\\r\\/]+)?\\/deidentifyTemplates\\/[^\\n\\r\\/]+$"
},
description = "Cloud DLP deidentify template name",
helpText =
"The Sensitive Data Protection de-identification template to use for API requests, specified with the pattern projects/<PROJECT_ID>/deidentifyTemplates/<TEMPLATE_ID>.",
example =
"projects/your-project-id/locations/global/deidentifyTemplates/generated_template_id")
@Required
ValueProvider<String> getDeidentifyTemplateName();
void setDeidentifyTemplateName(ValueProvider<String> value);
@TemplateParameter.Text(
order = 3,
groupName = "DLP Configuration",
optional = true,
regexes = {
"^projects\\/[^\\n\\r\\/]+(\\/locations\\/[^\\n\\r\\/]+)?\\/inspectTemplates\\/[^\\n\\r\\/]+$"
},
description = "Cloud DLP inspect template name",
helpText =
"The Sensitive Data Protection inspection template to use for API requests, specified"
+ " with the pattern projects/<PROJECT_ID>/identifyTemplates/<TEMPLATE_ID>.",
example =
"projects/your-project-id/locations/global/inspectTemplates/generated_template_id")
ValueProvider<String> getInspectTemplateName();
void setInspectTemplateName(ValueProvider<String> value);
@TemplateParameter.Integer(
order = 4,
groupName = "DLP Configuration",
optional = true,
description = "Batch size",
helpText =
"The chunking or batch size to use for sending data to inspect and detokenize. For a CSV file, the value of `batchSize` is the number of rows in a batch."
+ " Determine the batch size based on the size of the records and the sizing of the file."
+ " The DLP API has a payload size limit of 524 KB per API call.")
@Required
ValueProvider<Integer> getBatchSize();
void setBatchSize(ValueProvider<Integer> value);
@TemplateParameter.Text(
order = 5,
groupName = "Target",
regexes = {"^[^.]*$"},
description = "BigQuery Dataset",
helpText =
"The BigQuery dataset to use when sending tokenized results. The dataset must exist prior to execution.")
ValueProvider<String> getDatasetName();
void setDatasetName(ValueProvider<String> value);
@TemplateParameter.ProjectId(
order = 6,
groupName = "DLP Configuration",
description = "Cloud DLP project ID",
helpText =
"The ID for the Google Cloud project that owns the DLP API resource. This project"
+ " can be the same project that owns the Sensitive Data Protection templates, or it"
+ " can be a separate project.")
ValueProvider<String> getDlpProjectId();
void setDlpProjectId(ValueProvider<String> value);
}
/**
* The {@link CSVReader} class uses experimental Split DoFn to split each csv file contents in
* chunks and process it in non-monolithic fashion. For example: if a CSV file has 100 rows and
* batch size is set to 15, then initial restrictions for the SDF will be 1 to 7 and split
* restriction will be {{1-2},{2-3}..{7-8}} for parallel executions.
*/
static class CSVReader extends DoFn<KV<String, ReadableFile>, KV<String, Table>> {
private ValueProvider<Integer> batchSize;
private PCollectionView<List<KV<String, List<String>>>> headerMap;
/** This counter is used to track number of lines processed against batch size. */
private Integer lineCount;
public CSVReader(ValueProvider<Integer> batchSize) {
lineCount = 1;
this.batchSize = batchSize;
}
@ProcessElement
public void processElement(ProcessContext c, RestrictionTracker<OffsetRange, Long> tracker)
throws IOException {
for (long i = tracker.currentRestriction().getFrom(); tracker.tryClaim(i); ++i) {
String fileKey = c.element().getKey();
try (BufferedReader br = getReader(c.element().getValue())) {
List<Table.Row> rows = new ArrayList<>();
Table dlpTable = null;
/** finding out EOL for this restriction so that we know the SOL */
int endOfLine = (int) (i * batchSize.get().intValue());
int startOfLine = (endOfLine - batchSize.get().intValue());
// getting the DLP table headers
Iterator<CSVRecord> csvRows = CSVFormat.DEFAULT.parse(br).iterator();
if (!csvRows.hasNext()) {
LOG.info("File `" + c.element().getKey() + "` is empty");
continue;
}
List<FieldId> dlpTableHeaders = toDlpTableHeaders(csvRows.next());
/** skipping all the rows that's not part of this restriction */
for (int line = 0; line < startOfLine; line++) {
if (csvRows.hasNext()) {
csvRows.next();
}
}
/** looping through buffered reader and creating DLP Table Rows equals to batch */
while (csvRows.hasNext() && lineCount <= batchSize.get()) {
CSVRecord csvRow = csvRows.next();
rows.add(convertCsvRowToTableRow(csvRow));
lineCount += 1;
}
/** creating DLP table and output for next transformation */
dlpTable = Table.newBuilder().addAllHeaders(dlpTableHeaders).addAllRows(rows).build();
c.output(KV.of(fileKey, dlpTable));
LOG.debug(
"Current Restriction From: {}, Current Restriction To: {},"
+ " StartofLine: {}, End Of Line {}, BatchData {}",
tracker.currentRestriction().getFrom(),
tracker.currentRestriction().getTo(),
startOfLine,
endOfLine,
dlpTable.getRowsCount());
}
}
}
private static List<FieldId> toDlpTableHeaders(CSVRecord headerRow) {
List<FieldId> result = new ArrayList<>();
for (String header : headerRow) {
result.add(FieldId.newBuilder().setName(header).build());
}
return result;
}
/**
* SDF needs to define a @GetInitialRestriction method that can create a restriction describing
* the complete work for a given element. For our case this would be the total number of rows
* for each CSV file. We will calculate the number of split required based on total number of
* rows and batch size provided.
*
* @throws IOException
*/
@GetInitialRestriction
public OffsetRange getInitialRestriction(@Element KV<String, ReadableFile> csvFile)
throws IOException {
int rowCount = 0;
int totalSplit = 0;
try (BufferedReader br = getReader(csvFile.getValue())) {
/** assume first row is header */
int checkRowCount = (int) br.lines().count() - 1;
rowCount = (checkRowCount < 1) ? 1 : checkRowCount;
totalSplit = rowCount / batchSize.get().intValue();
int remaining = rowCount % batchSize.get().intValue();
/**
* Adjusting the total number of split based on remaining rows. For example: batch size of
* 15 for 100 rows will have total 7 splits. As it's a range last split will have offset
* range {7,8}
*/
if (remaining > 0) {
totalSplit = totalSplit + 2;
} else {
totalSplit = totalSplit + 1;
}
}
LOG.debug("Initial Restriction range from 1 to: {}", totalSplit);
return new OffsetRange(1, totalSplit);
}
/**
* SDF needs to define a @SplitRestriction method that can split the initial restriction to a
* number of smaller restrictions. For example: a initial restriction of (x, N) as input and
* produces pairs (x, 0), (x, 1), …, (x, N-1) as output.
*/
@SplitRestriction
public void splitRestriction(
@Element KV<String, ReadableFile> csvFile,
@Restriction OffsetRange range,
OutputReceiver<OffsetRange> out) {
/** split the initial restriction by 1 */
for (final OffsetRange p : range.split(1, 1)) {
out.output(p);
}
}
@NewTracker
public OffsetRangeTracker newTracker(@Restriction OffsetRange range) {
return new OffsetRangeTracker(new OffsetRange(range.getFrom(), range.getTo()));
}
private Table.Row convertCsvRowToTableRow(CSVRecord csvRow) {
/** convert from CSV row to DLP Table Row */
Iterator<String> valueIterator = csvRow.iterator();
Table.Row.Builder tableRowBuilder = Table.Row.newBuilder();
while (valueIterator.hasNext()) {
String value = valueIterator.next();
if (value != null) {
tableRowBuilder.addValues(Value.newBuilder().setStringValue(value.toString()).build());
} else {
tableRowBuilder.addValues(Value.newBuilder().setStringValue("").build());
}
}
return tableRowBuilder.build();
}
private List<String> getHeaders(List<KV<String, List<String>>> headerMap, String fileKey) {
return headerMap.stream()
.filter(map -> map.getKey().equalsIgnoreCase(fileKey))
.findFirst()
.map(e -> e.getValue())
.orElse(null);
}
}
/**
* The {@link DLPTokenizationDoFn} class executes tokenization request by calling DLP api. It uses
* DLP table as a content item as CSV file contains fully structured data. DLP templates (e.g.
* de-identify, inspect) need to exist before this pipeline runs. As response from the API is
* received, this DoFn outputs KV of new table with table id as key.
*/
static class DLPTokenizationDoFn extends DoFn<KV<String, Table>, KV<String, Table>> {
private ValueProvider<String> dlpProjectId;
private DlpServiceClient dlpServiceClient;
private ValueProvider<String> deIdentifyTemplateName;
private ValueProvider<String> inspectTemplateName;
private boolean inspectTemplateExist;
private Builder requestBuilder;
private final Distribution numberOfRowsTokenized =
Metrics.distribution(DLPTokenizationDoFn.class, "numberOfRowsTokenizedDistro");
private final Distribution numberOfBytesTokenized =
Metrics.distribution(DLPTokenizationDoFn.class, "numberOfBytesTokenizedDistro");
public DLPTokenizationDoFn(
ValueProvider<String> dlpProjectId,
ValueProvider<String> deIdentifyTemplateName,
ValueProvider<String> inspectTemplateName) {
this.dlpProjectId = dlpProjectId;
this.dlpServiceClient = null;
this.deIdentifyTemplateName = deIdentifyTemplateName;
this.inspectTemplateName = inspectTemplateName;
this.inspectTemplateExist = false;
}
@Setup
public void setup() {
if (this.inspectTemplateName.isAccessible()) {
if (this.inspectTemplateName.get() != null) {
this.inspectTemplateExist = true;
}
}
if (this.deIdentifyTemplateName.isAccessible()) {
if (this.deIdentifyTemplateName.get() != null) {
this.requestBuilder =
DeidentifyContentRequest.newBuilder()
.setParent(ProjectName.of(this.dlpProjectId.get()).toString())
.setDeidentifyTemplateName(this.deIdentifyTemplateName.get());
if (this.inspectTemplateExist) {
this.requestBuilder.setInspectTemplateName(this.inspectTemplateName.get());
}
}
}
}
@StartBundle
public void startBundle() throws SQLException {
try {
this.dlpServiceClient = DlpServiceClient.create();
} catch (IOException e) {
LOG.error("Failed to create DLP Service Client", e.getMessage());
throw new RuntimeException(e);
}
}
@FinishBundle
public void finishBundle() throws Exception {
if (this.dlpServiceClient != null) {
this.dlpServiceClient.close();
}
}
@ProcessElement
public void processElement(ProcessContext c) {
String key = c.element().getKey();
Table nonEncryptedData = c.element().getValue();
ContentItem tableItem = ContentItem.newBuilder().setTable(nonEncryptedData).build();
this.requestBuilder.setItem(tableItem);
DeidentifyContentResponse response =
dlpServiceClient.deidentifyContent(this.requestBuilder.build());
Table tokenizedData = response.getItem().getTable();
numberOfRowsTokenized.update(tokenizedData.getRowsList().size());
numberOfBytesTokenized.update(tokenizedData.toByteArray().length);
c.output(KV.of(key, tokenizedData));
}
}
/**
* The {@link TableRowProcessorDoFn} class process tokenized DLP tables and convert them to
* BigQuery Table Row.
*/
public static class TableRowProcessorDoFn extends DoFn<KV<String, Table>, KV<String, TableRow>> {
@ProcessElement
public void processElement(ProcessContext c) {
Table tokenizedData = c.element().getValue();
List<String> headers =
tokenizedData.getHeadersList().stream()
.map(fid -> fid.getName())
.collect(Collectors.toList());
List<Table.Row> outputRows = tokenizedData.getRowsList();
if (outputRows.size() > 0) {
for (Table.Row outputRow : outputRows) {
if (outputRow.getValuesCount() != headers.size()) {
throw new IllegalArgumentException(
"CSV file's header count must exactly match with data element count");
}
c.output(
KV.of(
c.element().getKey(),
createBqRow(outputRow, headers.toArray(new String[headers.size()]))));
}
}
}
private static TableRow createBqRow(Table.Row tokenizedValue, String[] headers) {
TableRow bqRow = new TableRow();
AtomicInteger headerIndex = new AtomicInteger(0);
List<TableCell> cells = new ArrayList<>();
tokenizedValue
.getValuesList()
.forEach(
value -> {
String checkedHeaderName =
checkHeaderName(headers[headerIndex.getAndIncrement()].toString());
bqRow.set(checkedHeaderName, value.getStringValue());
cells.add(new TableCell().set(checkedHeaderName, value.getStringValue()));
});
bqRow.setF(cells);
return bqRow;
}
}
/**
* The {@link BQDestination} class creates BigQuery table destination and table schema based on
* the CSV file processed in earlier transformations. Table id is same as filename Table schema is
* same as file header columns.
*/
public static class BQDestination
extends DynamicDestinations<KV<String, TableRow>, KV<String, TableRow>> {
private ValueProvider<String> datasetName;
private ValueProvider<String> projectId;
public BQDestination(ValueProvider<String> datasetName, ValueProvider<String> projectId) {
this.datasetName = datasetName;
this.projectId = projectId;
}
@Override
public KV<String, TableRow> getDestination(ValueInSingleWindow<KV<String, TableRow>> element) {
String key = element.getValue().getKey();
String tableName = String.format("%s:%s.%s", projectId.get(), datasetName.get(), key);
LOG.debug("Table Name {}", tableName);
return KV.of(tableName, element.getValue().getValue());
}
@Override
public TableDestination getTable(KV<String, TableRow> destination) {
TableDestination dest =
new TableDestination(destination.getKey(), "pii-tokenized output data from dataflow");
LOG.debug("Table Destination {}", dest.getTableSpec());
return dest;
}
@Override
public TableSchema getSchema(KV<String, TableRow> destination) {
TableRow bqRow = destination.getValue();
TableSchema schema = new TableSchema();
List<TableFieldSchema> fields = new ArrayList<TableFieldSchema>();
List<TableCell> cells = bqRow.getF();
for (int i = 0; i < cells.size(); i++) {
Map<String, Object> object = cells.get(i);
String header = object.keySet().iterator().next();
/** currently all BQ data types are set to String */
fields.add(new TableFieldSchema().setName(checkHeaderName(header)).setType("STRING"));
}
schema.setFields(fields);
return schema;
}
}
private static String getFileName(ReadableFile file) {
String csvFileName = file.getMetadata().resourceId().getFilename().toString();
/** taking out .csv extension from file name e.g fileName.csv->fileName */
String[] fileKey = csvFileName.split("\\.", 2);
if (!fileKey[1].equals(ALLOWED_FILE_EXTENSION) || !TABLE_REGEXP.matcher(fileKey[0]).matches()) {
throw new RuntimeException(
"[Filename must contain a CSV extension "
+ " BQ table name must contain only letters, numbers, or underscores ["
+ fileKey[1]
+ "], ["
+ fileKey[0]
+ "]");
}
/** returning file name without extension */
return fileKey[0];
}
private static BufferedReader getReader(ReadableFile csvFile) {
BufferedReader br = null;
ReadableByteChannel channel = null;
/** read the file and create buffered reader */
try {
channel = csvFile.openSeekable();
} catch (IOException e) {
LOG.error("Failed to Read File {}", e.getMessage());
throw new RuntimeException(e);
}
if (channel != null) {
br = new BufferedReader(Channels.newReader(channel, StandardCharsets.UTF_8.name()));
}
return br;
}
private static String checkHeaderName(String name) {
/** some checks to make sure BQ column names don't fail e.g. special characters */
String checkedHeader = name.replaceAll("\\s", "_");
checkedHeader = checkedHeader.replaceAll("'", "");
checkedHeader = checkedHeader.replaceAll("/", "");
if (!COLUMN_NAME_REGEXP.matcher(checkedHeader).matches()) {
throw new IllegalArgumentException("Column name can't be matched to a valid format " + name);
}
return checkedHeader;
}
}
