/**
* Copyright (C) cedarsoft GmbH.
*
* Licensed under the GNU General Public License version 3 (the "License")
* with Classpath Exception; you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.cedarsoft.org/gpl3ce
* (GPL 3 with Classpath Exception)
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3 only, as
* published by the Free Software Foundation. cedarsoft GmbH designates this
* particular file as subject to the "Classpath" exception as provided
* by cedarsoft GmbH in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 3 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 3 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact cedarsoft GmbH, 72810 Gomaringen, Germany,
* or visit www.cedarsoft.com if you need additional information or
* have any questions.
*/
package com.cedarsoft.couchdb;
import com.cedarsoft.couchdb.core.ActionFailedException;
import com.cedarsoft.couchdb.core.DesignDocument;
import com.cedarsoft.couchdb.core.Revision;
import com.cedarsoft.couchdb.core.View;
import com.cedarsoft.couchdb.io.ActionResponseSerializer;
import com.cedarsoft.serialization.jackson.JacksonParserWrapper;
import com.cedarsoft.serialization.jackson.JacksonSupport;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Updates the design documents
*
* @author Johannes Schneider (<a href="mailto:js@cedarsoft.com">js@cedarsoft.com</a>)
*/
public class DesignDocumentsUpdater {
@Nonnull
private static final Logger LOG = Logger.getLogger( DesignDocumentsUpdater.class.getName() );
@Nonnull
private final CouchDatabase database;
/**
* Creates a new updater for the given database
*
* @param database the database
*/
public DesignDocumentsUpdater( @Nonnull CouchDatabase database ) {
this.database = database;
}
/**
* Creates the json content for the design document
*
* @return a string containing the json content for this design document
*
* @throws IOException
*/
public static String createJson( @Nonnull DesignDocument designDocument, @Nullable Revision revision ) throws IOException {
//noinspection TypeMayBeWeakened
StringWriter writer = new StringWriter();
JsonGenerator generator = new JsonFactory().createJsonGenerator( writer );
generator.writeStartObject();
generator.writeStringField( "_id", designDocument.getId() );
if ( revision != null ) {
generator.writeStringField( "_rev", revision.asString() );
}
generator.writeStringField( "language", "javascript" );
generator.writeObjectFieldStart( "views" );
for ( View view : designDocument.getViews() ) {
generator.writeObjectFieldStart( view.getName() );
generator.writeStringField( "map", view.getMappingFunction() );
@Nullable String reduceFunction = view.getReduceFunction();
if ( reduceFunction != null ) {
generator.writeStringField( "reduce", reduceFunction );
}
generator.writeEndObject();
}
generator.writeEndObject();
generator.writeEndObject();
generator.flush();
return writer.toString();
}
/**
* Uploads the given design documents to the database
*
* @param designDocuments the design documents
* @throws IOException
* @throws ActionFailedException
*/
public void update( @Nonnull Iterable<? extends DesignDocument> designDocuments ) throws IOException, ActionFailedException {
for ( DesignDocument designDocument : designDocuments ) {
if ( !designDocument.hasViews() ) {
continue;
}
if ( LOG.isLoggable( Level.INFO ) ) {
LOG.info( "Updating document <" + designDocument.getId() + ">:" );
}
String path = designDocument.getDesignDocumentPath();
WebResource resource = database.getDbRoot().path( path );
@Nullable Revision currentRevision = getRevision( resource );
if ( LOG.isLoggable( Level.FINE ) ) {
LOG.fine( "PUT: " + resource.toString() );
}
ClientResponse response = resource.put( ClientResponse.class, createJson( designDocument, currentRevision ) );
try {
ActionResponseSerializer.verifyNoError( response );
} finally {
response.close();
}
}
}
/**
* Returns the current revision (if there is one) or null
*
* @param path the path
* @return the revision or null if there is no revision
*/
@Nullable
private static Revision getRevision( @Nonnull WebResource path ) throws ActionFailedException, IOException {
if ( LOG.isLoggable( Level.FINE ) ) {
LOG.fine( "HEAD: " + path.toString() );
}
ClientResponse response = path.get( ClientResponse.class );
try {
if ( LOG.isLoggable( Level.FINE ) ) {
LOG.fine( "\tStatus: " + response.getStatus() );
}
if ( response.getClientResponseStatus() == ClientResponse.Status.NOT_FOUND ) {
return null;
}
ActionResponseSerializer.verifyNoError( response );
if ( response.getClientResponseStatus() != ClientResponse.Status.OK ) {
throw new IllegalStateException( "Invalid response: " + response.getStatus() + ": " + response.getEntity( String.class ) );
}
JsonFactory jsonFactory = JacksonSupport.getJsonFactory();
try ( InputStream entityInputStream = response.getEntityInputStream() ) {
JsonParser parser = jsonFactory.createJsonParser( entityInputStream );
JacksonParserWrapper wrapper = new JacksonParserWrapper( parser );
wrapper.nextToken( JsonToken.START_OBJECT );
wrapper.nextFieldValue( "_id" );
wrapper.nextFieldValue( "_rev" );
return new Revision( wrapper.getText() );
}
} finally {
response.close();
}
}
}