/**
* 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.solr.handler;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.request.SolrParams;
import org.apache.solr.request.SolrQueryResponse;
import org.apache.solr.util.ContentStream;
import org.apache.solr.core.SolrException;
import org.apache.solr.schema.IndexSchema;
import org.apache.solr.schema.SchemaField;
import org.apache.solr.util.StrUtils;
import org.apache.solr.update.*;
import org.apache.commons.csv.CSVStrategy;
import org.apache.commons.csv.CSVParser;
import org.apache.commons.io.IOUtils;
import java.util.regex.Pattern;
import java.util.List;
import java.io.*;
/**
* @author yonik
* @version $Id$
*/
public class CSVRequestHandler extends RequestHandlerBase {
public void handleRequestBody(SolrQueryRequest req, SolrQueryResponse rsp) throws Exception {
CSVLoader loader = new SingleThreadedCSVLoader(req);
Iterable<ContentStream> streams = req.getContentStreams();
if (streams == null) {
if(!RequestHandlerUtils.handleCommit(req, rsp, false)) {
throw new SolrException( SolrException.ErrorCode.BAD_REQUEST, "missing content stream" );
}
return;
}
for(ContentStream stream : streams) {
Reader reader = stream.getReader();
try {
loader.errHeader = "CSVLoader: input=" + stream.getSourceInfo();
loader.load(reader);
} finally {
IOUtils.closeQuietly(reader);
}
}
// perhaps commit when we are done
RequestHandlerUtils.handleCommit(req, rsp, false);
}
//////////////////////// SolrInfoMBeans methods //////////////////////
@Override
public String getDescription() {
return "Add/Update multiple documents with CSV formatted rows";
}
@Override
public String getVersion() {
return "$Revision:$";
}
@Override
public String getSourceId() {
return "$Id:$";
}
@Override
public String getSource() {
return "$URL:$";
}
}
abstract class CSVLoader {
static String SEPARATOR="separator";
static String FIELDNAMES="fieldnames";
static String HEADER="header";
static String SKIP="skip";
static String SKIPLINES="skipLines";
static String MAP="map";
static String TRIM="trim";
static String EMPTY="keepEmpty";
static String SPLIT="split";
static String ENCAPSULATOR="encapsulator";
static String OVERWRITE="overwrite";
private static Pattern colonSplit = Pattern.compile(":");
private static Pattern commaSplit = Pattern.compile(",");
final IndexSchema schema;
final SolrParams params;
final UpdateHandler handler;
final CSVStrategy strategy;
String[] fieldnames;
SchemaField[] fields;
CSVLoader.FieldAdder[] adders;
int skipLines; // number of lines to skip at start of file
final AddUpdateCommand templateAdd;
/** Add a field to a document unless it's zero length.
* The FieldAdder hierarchy handles all the complexity of
* further transforming or splitting field values to keep the
* main logic loop clean. All implementations of add() must be
* MT-safe!
*/
private class FieldAdder {
void add(DocumentBuilder builder, int line, int column, String val) {
if (val.length() > 0) {
builder.addField(fields[column].getName(),val,1.0f);
}
}
}
/** add zero length fields */
private class FieldAdderEmpty extends CSVLoader.FieldAdder {
void add(DocumentBuilder builder, int line, int column, String val) {
builder.addField(fields[column].getName(),val,1.0f);
}
}
/** trim fields */
private class FieldTrimmer extends CSVLoader.FieldAdder {
private final CSVLoader.FieldAdder base;
FieldTrimmer(CSVLoader.FieldAdder base) { this.base=base; }
void add(DocumentBuilder builder, int line, int column, String val) {
base.add(builder, line, column, val.trim());
}
}
/** map a single value.
* for just a couple of mappings, this is probably faster than
* using a HashMap.
*/
private class FieldMapperSingle extends CSVLoader.FieldAdder {
private final String from;
private final String to;
private final CSVLoader.FieldAdder base;
FieldMapperSingle(String from, String to, CSVLoader.FieldAdder base) {
this.from=from;
this.to=to;
this.base=base;
}
void add(DocumentBuilder builder, int line, int column, String val) {
if (from.equals(val)) val=to;
base.add(builder,line,column,val);
}
}
/** Split a single value into multiple values based on
* a CSVStrategy.
*/
private class FieldSplitter extends CSVLoader.FieldAdder {
private final CSVStrategy strategy;
private final CSVLoader.FieldAdder base;
FieldSplitter(CSVStrategy strategy, CSVLoader.FieldAdder base) {
this.strategy = strategy;
this.base = base;
}
void add(DocumentBuilder builder, int line, int column, String val) {
CSVParser parser = new CSVParser(new StringReader(val), strategy);
try {
String[] vals = parser.getLine();
if (vals!=null) {
for (String v: vals) base.add(builder,line,column,v);
} else {
base.add(builder,line,column,val);
}
} catch (IOException e) {
throw new SolrException( SolrException.ErrorCode.BAD_REQUEST,"");
}
}
}
String errHeader="CSVLoader:";
CSVLoader(SolrQueryRequest req) {
this.params = req.getParams();
handler = req.getCore().getUpdateHandler();
schema = req.getSchema();
templateAdd = new AddUpdateCommand();
templateAdd.allowDups=false;
templateAdd.overwriteCommitted=true;
templateAdd.overwritePending=true;
if (params.getBool(OVERWRITE,true)) {
templateAdd.allowDups=false;
templateAdd.overwriteCommitted=true;
templateAdd.overwritePending=true;
} else {
templateAdd.allowDups=true;
templateAdd.overwriteCommitted=false;
templateAdd.overwritePending=false;
}
strategy = new CSVStrategy(',', '"', CSVStrategy.COMMENTS_DISABLED, true, false, true);
String sep = params.get(SEPARATOR);
if (sep!=null) {
if (sep.length()!=1) throw new SolrException( SolrException.ErrorCode.BAD_REQUEST,"Invalid separator:'"+sep+"'");
strategy.setDelimiter(sep.charAt(0));
}
String encapsulator = params.get(ENCAPSULATOR);
if (encapsulator!=null) {
if (encapsulator.length()!=1) throw new SolrException( SolrException.ErrorCode.BAD_REQUEST,"Invalid encapsulator:'"+sep+"'");
strategy.setEncapsulator(encapsulator.charAt(0));
}
String fn = params.get(FIELDNAMES);
fieldnames = fn != null ? commaSplit.split(fn,-1) : null;
Boolean hasHeader = params.getBool(HEADER);
skipLines = params.getInt(SKIPLINES,0);
if (fieldnames==null) {
if (null == hasHeader) {
// assume the file has the headers if they aren't supplied in the args
hasHeader=true;
} else if (hasHeader) {
throw new SolrException( SolrException.ErrorCode.BAD_REQUEST,"CSVLoader: must specify fieldnames=<fields>* or header=true");
}
} else {
// if the fieldnames were supplied and the file has a header, we need to
// skip over that header.
if (hasHeader!=null && hasHeader) skipLines++;
prepareFields();
}
}
/** create the FieldAdders that control how each field is indexed */
void prepareFields() {
// Possible future optimization: for really rapid incremental indexing
// from a POST, one could cache all of this setup info based on the params.
// The link from FieldAdder to this would need to be severed for that to happen.
fields = new SchemaField[fieldnames.length];
adders = new CSVLoader.FieldAdder[fieldnames.length];
String skipStr = params.get(SKIP);
List<String> skipFields = skipStr==null ? null : StrUtils.splitSmart(skipStr,',');
CSVLoader.FieldAdder adder = new CSVLoader.FieldAdder();
CSVLoader.FieldAdder adderKeepEmpty = new CSVLoader.FieldAdderEmpty();
for (int i=0; i<fields.length; i++) {
String fname = fieldnames[i];
// to skip a field, leave the entries in fields and addrs null
if (fname.length()==0 || (skipFields!=null && skipFields.contains(fname))) continue;
fields[i] = schema.getField(fname);
boolean keepEmpty = params.getFieldBool(fname,EMPTY,false);
adders[i] = keepEmpty ? adderKeepEmpty : adder;
// Order that operations are applied: split -> trim -> map -> add
// so create in reverse order.
// Creation of FieldAdders could be optimized and shared among fields
String[] fmap = params.getFieldParams(fname,MAP);
if (fmap!=null) {
for (String mapRule : fmap) {
String[] mapArgs = colonSplit.split(mapRule,-1);
if (mapArgs.length!=2)
throw new SolrException( SolrException.ErrorCode.BAD_REQUEST, "Map rules must be of the form 'from:to' ,got '"+mapRule+"'");
adders[i] = new CSVLoader.FieldMapperSingle(mapArgs[0], mapArgs[1], adders[i]);
}
}
if (params.getFieldBool(fname,TRIM,false)) {
adders[i] = new CSVLoader.FieldTrimmer(adders[i]);
}
if (params.getFieldBool(fname,SPLIT,false)) {
String sepStr = params.getFieldParam(fname,SEPARATOR);
char fsep = sepStr==null || sepStr.length()==0 ? ',' : sepStr.charAt(0);
String encStr = params.getFieldParam(fname,ENCAPSULATOR);
char fenc = encStr==null || encStr.length()==0 ? '\'' : encStr.charAt(0);
CSVStrategy fstrat = new CSVStrategy(fsep,fenc,CSVStrategy.COMMENTS_DISABLED);
adders[i] = new CSVLoader.FieldSplitter(fstrat, adders[i]);
}
}
}
private void input_err(String msg, String[] line, int lineno) {
StringBuilder sb = new StringBuilder();
sb.append(errHeader+", line="+lineno + ","+msg+"\n\tvalues={");
for (String val: line) { sb.append("'"+val+"',"); }
sb.append('}');
throw new SolrException( SolrException.ErrorCode.BAD_REQUEST,sb.toString());
}
/** load the CSV input */
void load(Reader input) throws IOException {
Reader reader = input;
if (skipLines>0) {
if (!(reader instanceof BufferedReader)) {
reader = new BufferedReader(reader);
}
BufferedReader r = (BufferedReader)reader;
for (int i=0; i<skipLines; i++) {
r.readLine();
}
}
CSVParser parser = new CSVParser(reader, strategy);
// parse the fieldnames from the header of the file
if (fieldnames==null) {
fieldnames = parser.getLine();
if (fieldnames==null) {
throw new SolrException( SolrException.ErrorCode.BAD_REQUEST,"Expected fieldnames in CSV input");
}
prepareFields();
}
// read the rest of the CSV file
for(;;) {
int line = parser.getLineNumber(); // for error reporting in MT mode
String[] vals = parser.getLine();
if (vals==null) break;
if (vals.length != fields.length) {
input_err("expected "+fields.length+" values but got "+vals.length, vals, line);
}
addDoc(line,vals);
}
}
/** called for each line of values (document) */
abstract void addDoc(int line, String[] vals) throws IOException;
/** this must be MT safe... may be called concurrently from multiple threads. */
void doAdd(int line, String[] vals, DocumentBuilder builder, AddUpdateCommand template) throws IOException {
// the line number is passed simply for error reporting in MT mode.
// first, create the lucene document
builder.startDoc();
for (int i=0; i<vals.length; i++) {
if (fields[i]==null) continue; // ignore this field
String val = vals[i];
adders[i].add(builder, line, i, val);
}
builder.endDoc();
template.doc = builder.getDoc();
handler.addDoc(template);
}
}
class SingleThreadedCSVLoader extends CSVLoader {
protected DocumentBuilder builder;
SingleThreadedCSVLoader(SolrQueryRequest req) {
super(req);
builder = new DocumentBuilder(schema);
}
void addDoc(int line, String[] vals) throws IOException {
templateAdd.indexedId = null;
doAdd(line, vals, builder, templateAdd);
}
}