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/*
* 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.hadoop.fs.s3a.select;
import java.io.IOException;
import java.util.Locale;
import com.amazonaws.services.s3.model.CSVInput;
import com.amazonaws.services.s3.model.CSVOutput;
import com.amazonaws.services.s3.model.ExpressionType;
import com.amazonaws.services.s3.model.InputSerialization;
import com.amazonaws.services.s3.model.OutputSerialization;
import com.amazonaws.services.s3.model.QuoteFields;
import com.amazonaws.services.s3.model.SelectObjectContentRequest;
import org.apache.hadoop.thirdparty.com.google.common.base.Preconditions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.commons.lang3.StringUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathIOException;
import org.apache.hadoop.fs.s3a.Retries;
import org.apache.hadoop.fs.s3a.S3AReadOpContext;
import org.apache.hadoop.fs.s3a.S3ObjectAttributes;
import org.apache.hadoop.fs.s3a.WriteOperationHelper;
import static org.apache.hadoop.thirdparty.com.google.common.base.Preconditions.checkNotNull;
import static org.apache.commons.lang3.StringUtils.isNotEmpty;
import static org.apache.hadoop.fs.s3a.select.SelectConstants.*;
/**
* Class to do the S3 select binding and build a select request from the
* supplied arguments/configuration.
*
* This class is intended to be instantiated by the owning S3AFileSystem
* instance to handle the construction of requests: IO is still done exclusively
* in the filesystem.
*
*/
public class SelectBinding {
static final Logger LOG =
LoggerFactory.getLogger(SelectBinding.class);
/** Operations on the store. */
private final WriteOperationHelper operations;
/** Is S3 Select enabled? */
private final boolean enabled;
private final boolean errorsIncludeSql;
/**
* Constructor.
* @param operations callback to owner FS, with associated span.
*/
public SelectBinding(final WriteOperationHelper operations) {
this.operations = checkNotNull(operations);
Configuration conf = getConf();
this.enabled = isSelectEnabled(conf);
this.errorsIncludeSql = conf.getBoolean(SELECT_ERRORS_INCLUDE_SQL, false);
}
Configuration getConf() {
return operations.getConf();
}
/**
* Is the service supported?
* @return true iff select is enabled.
*/
public boolean isEnabled() {
return enabled;
}
/**
* Static probe for select being enabled.
* @param conf configuration
* @return true iff select is enabled.
*/
public static boolean isSelectEnabled(Configuration conf) {
return conf.getBoolean(FS_S3A_SELECT_ENABLED, true);
}
/**
* Build and execute a select request.
* @param readContext the read context, which includes the source path.
* @param expression the SQL expression.
* @param builderOptions query options
* @param objectAttributes object attributes from a HEAD request
* @return an FSDataInputStream whose wrapped stream is a SelectInputStream
* @throws IllegalArgumentException argument failure
* @throws IOException failure building, validating or executing the request.
* @throws PathIOException source path is a directory.
*/
@Retries.RetryTranslated
public FSDataInputStream select(
final S3AReadOpContext readContext,
final String expression,
final Configuration builderOptions,
final S3ObjectAttributes objectAttributes) throws IOException {
return new FSDataInputStream(
executeSelect(readContext,
objectAttributes,
builderOptions,
buildSelectRequest(
readContext.getPath(),
expression,
builderOptions
)));
}
/**
* Build a select request.
* @param path source path.
* @param expression the SQL expression.
* @param builderOptions config to extract other query options from
* @return the request to serve
* @throws IllegalArgumentException argument failure
* @throws IOException problem building/validating the request
*/
public SelectObjectContentRequest buildSelectRequest(
final Path path,
final String expression,
final Configuration builderOptions)
throws IOException {
Preconditions.checkState(isEnabled(),
"S3 Select is not enabled for %s", path);
SelectObjectContentRequest request = operations.newSelectRequest(path);
buildRequest(request, expression, builderOptions);
return request;
}
/**
* Execute the select request.
* @param readContext read context
* @param objectAttributes object attributes from a HEAD request
* @param builderOptions the options which came in from the openFile builder.
* @param request the built up select request.
* @return a SelectInputStream
* @throws IOException failure
* @throws PathIOException source path is a directory.
*/
@Retries.RetryTranslated
private SelectInputStream executeSelect(
final S3AReadOpContext readContext,
final S3ObjectAttributes objectAttributes,
final Configuration builderOptions,
final SelectObjectContentRequest request) throws IOException {
Path path = readContext.getPath();
if (readContext.getDstFileStatus().isDirectory()) {
throw new PathIOException(path.toString(),
"Can't select " + path
+ " because it is a directory");
}
boolean sqlInErrors = builderOptions.getBoolean(SELECT_ERRORS_INCLUDE_SQL,
errorsIncludeSql);
String expression = request.getExpression();
final String errorText = sqlInErrors ? expression : "Select";
if (sqlInErrors) {
LOG.info("Issuing SQL request {}", expression);
}
return new SelectInputStream(readContext,
objectAttributes,
operations.select(path, request, errorText));
}
/**
* Build the select request from the configuration built up
* in {@code S3AFileSystem.openFile(Path)} and the default
* options in the cluster configuration.
*
* Options are picked up in the following order.
*
*
Options in {@code openFileOptions}.
*
Options in the owning filesystem configuration.
*
The default values in {@link SelectConstants}
*
*
* @param request request to build up
* @param expression SQL expression
* @param builderOptions the options which came in from the openFile builder.
* @throws IllegalArgumentException if an option is somehow invalid.
* @throws IOException if an option is somehow invalid.
*/
void buildRequest(
final SelectObjectContentRequest request,
final String expression,
final Configuration builderOptions)
throws IllegalArgumentException, IOException {
Preconditions.checkArgument(StringUtils.isNotEmpty(expression),
"No expression provided in parameter " + SELECT_SQL);
final Configuration ownerConf = operations.getConf();
String inputFormat = builderOptions.get(SELECT_INPUT_FORMAT,
SELECT_FORMAT_CSV).toLowerCase(Locale.ENGLISH);
Preconditions.checkArgument(SELECT_FORMAT_CSV.equals(inputFormat),
"Unsupported input format %s", inputFormat);
String outputFormat = builderOptions.get(SELECT_OUTPUT_FORMAT,
SELECT_FORMAT_CSV)
.toLowerCase(Locale.ENGLISH);
Preconditions.checkArgument(SELECT_FORMAT_CSV.equals(outputFormat),
"Unsupported output format %s", outputFormat);
request.setExpressionType(ExpressionType.SQL);
request.setExpression(expandBackslashChars(expression));
InputSerialization inputSerialization = buildCsvInputRequest(ownerConf,
builderOptions);
String compression = opt(builderOptions,
ownerConf,
SELECT_INPUT_COMPRESSION,
COMPRESSION_OPT_NONE,
true).toUpperCase(Locale.ENGLISH);
if (isNotEmpty(compression)) {
inputSerialization.setCompressionType(compression);
}
request.setInputSerialization(inputSerialization);
request.setOutputSerialization(buildCSVOutput(ownerConf, builderOptions));
}
/**
* Build the CSV input request.
* @param ownerConf FS owner configuration
* @param builderOptions options on the specific request
* @return the constructed request
* @throws IllegalArgumentException argument failure
* @throws IOException validation failure
*/
public InputSerialization buildCsvInputRequest(
final Configuration ownerConf,
final Configuration builderOptions)
throws IllegalArgumentException, IOException {
String headerInfo = opt(builderOptions,
ownerConf,
CSV_INPUT_HEADER,
CSV_INPUT_HEADER_OPT_DEFAULT,
true).toUpperCase(Locale.ENGLISH);
String commentMarker = xopt(builderOptions,
ownerConf,
CSV_INPUT_COMMENT_MARKER,
CSV_INPUT_COMMENT_MARKER_DEFAULT);
String fieldDelimiter = xopt(builderOptions,
ownerConf,
CSV_INPUT_INPUT_FIELD_DELIMITER,
CSV_INPUT_FIELD_DELIMITER_DEFAULT);
String recordDelimiter = xopt(builderOptions,
ownerConf,
CSV_INPUT_RECORD_DELIMITER,
CSV_INPUT_RECORD_DELIMITER_DEFAULT);
String quoteCharacter = xopt(builderOptions,
ownerConf,
CSV_INPUT_QUOTE_CHARACTER,
CSV_INPUT_QUOTE_CHARACTER_DEFAULT);
String quoteEscapeCharacter = xopt(builderOptions,
ownerConf,
CSV_INPUT_QUOTE_ESCAPE_CHARACTER,
CSV_INPUT_QUOTE_ESCAPE_CHARACTER_DEFAULT);
// CSV input
CSVInput csv = new CSVInput();
csv.setFieldDelimiter(fieldDelimiter);
csv.setRecordDelimiter(recordDelimiter);
csv.setComments(commentMarker);
csv.setQuoteCharacter(quoteCharacter);
if (StringUtils.isNotEmpty(quoteEscapeCharacter)) {
csv.setQuoteEscapeCharacter(quoteEscapeCharacter);
}
csv.setFileHeaderInfo(headerInfo);
InputSerialization inputSerialization = new InputSerialization();
inputSerialization.setCsv(csv);
return inputSerialization;
}
/**
* Build CSV output for a request.
* @param ownerConf FS owner configuration
* @param builderOptions options on the specific request
* @return the constructed request
* @throws IllegalArgumentException argument failure
* @throws IOException validation failure
*/
public OutputSerialization buildCSVOutput(
final Configuration ownerConf,
final Configuration builderOptions)
throws IllegalArgumentException, IOException {
String fieldDelimiter = xopt(builderOptions,
ownerConf,
CSV_OUTPUT_FIELD_DELIMITER,
CSV_OUTPUT_FIELD_DELIMITER_DEFAULT);
String recordDelimiter = xopt(builderOptions,
ownerConf,
CSV_OUTPUT_RECORD_DELIMITER,
CSV_OUTPUT_RECORD_DELIMITER_DEFAULT);
String quoteCharacter = xopt(builderOptions,
ownerConf,
CSV_OUTPUT_QUOTE_CHARACTER,
CSV_OUTPUT_QUOTE_CHARACTER_DEFAULT);
String quoteEscapeCharacter = xopt(builderOptions,
ownerConf,
CSV_OUTPUT_QUOTE_ESCAPE_CHARACTER,
CSV_OUTPUT_QUOTE_ESCAPE_CHARACTER_DEFAULT);
String quoteFields = xopt(builderOptions,
ownerConf,
CSV_OUTPUT_QUOTE_FIELDS,
CSV_OUTPUT_QUOTE_FIELDS_ALWAYS).toUpperCase(Locale.ENGLISH);
// output is CSV, always
OutputSerialization outputSerialization
= new OutputSerialization();
CSVOutput csvOut = new CSVOutput();
csvOut.setQuoteCharacter(quoteCharacter);
csvOut.setQuoteFields(
QuoteFields.fromValue(quoteFields));
csvOut.setFieldDelimiter(fieldDelimiter);
csvOut.setRecordDelimiter(recordDelimiter);
if (!quoteEscapeCharacter.isEmpty()) {
csvOut.setQuoteEscapeCharacter(quoteEscapeCharacter);
}
outputSerialization.setCsv(csvOut);
return outputSerialization;
}
/**
* Stringify the given SelectObjectContentRequest, as its
* toString() operator doesn't.
* @param request request to convert to a string
* @return a string to print. Does not contain secrets.
*/
public static String toString(final SelectObjectContentRequest request) {
StringBuilder sb = new StringBuilder();
sb.append("SelectObjectContentRequest{")
.append("bucket name=").append(request.getBucketName())
.append("; key=").append(request.getKey())
.append("; expressionType=").append(request.getExpressionType())
.append("; expression=").append(request.getExpression());
InputSerialization input = request.getInputSerialization();
if (input != null) {
sb.append("; Input")
.append(input.toString());
} else {
sb.append("; Input Serialization: none");
}
OutputSerialization out = request.getOutputSerialization();
if (out != null) {
sb.append("; Output")
.append(out.toString());
} else {
sb.append("; Output Serialization: none");
}
return sb.append("}").toString();
}
/**
* Resolve an option.
* @param builderOptions the options which came in from the openFile builder.
* @param fsConf configuration of the owning FS.
* @param base base option (no s3a: prefix)
* @param defVal default value. Must not be null.
* @param trim should the result be trimmed.
* @return the possibly trimmed value.
*/
static String opt(Configuration builderOptions,
Configuration fsConf,
String base,
String defVal,
boolean trim) {
String r = builderOptions.get(base, fsConf.get(base, defVal));
return trim ? r.trim() : r;
}
/**
* Get an option with backslash arguments transformed.
* These are not trimmed, so whitespace is significant.
* @param selectOpts options in the select call
* @param fsConf filesystem conf
* @param base base option name
* @param defVal default value
* @return the transformed value
*/
static String xopt(Configuration selectOpts,
Configuration fsConf,
String base,
String defVal) {
return expandBackslashChars(
opt(selectOpts, fsConf, base, defVal, false));
}
/**
* Perform escaping.
* @param src source string.
* @return the replaced value
*/
static String expandBackslashChars(String src) {
return src.replace("\\n", "\n")
.replace("\\\"", "\"")
.replace("\\t", "\t")
.replace("\\r", "\r")
.replace("\\\"", "\"")
// backslash substitution must come last
.replace("\\\\", "\\");
}
}
