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Continual's modeling library.
/*
* Copyright 2019, Continual.io
*
* 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 io.continual.services.model.impl.json;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import io.continual.iam.access.AccessControlEntry;
import io.continual.iam.access.AccessControlList;
import io.continual.iam.exceptions.IamSvcException;
import io.continual.iam.identity.Identity;
import io.continual.services.ServiceContainer;
import io.continual.services.SimpleService;
import io.continual.services.model.core.Model;
import io.continual.services.model.core.ModelNotificationService;
import io.continual.services.model.core.ModelObjectFactory;
import io.continual.services.model.core.ModelObjectMetadata;
import io.continual.services.model.core.ModelOperation;
import io.continual.services.model.core.ModelRelationInstance;
import io.continual.services.model.core.ModelRequestContext;
import io.continual.services.model.core.ModelSchema;
import io.continual.services.model.core.ModelSchema.ValidationResult;
import io.continual.services.model.core.ModelSchemaRegistry;
import io.continual.services.model.core.ModelTraversal;
import io.continual.services.model.core.data.BasicModelObject;
import io.continual.services.model.core.data.ModelObject;
import io.continual.services.model.core.exceptions.ModelItemDoesNotExistException;
import io.continual.services.model.core.exceptions.ModelRequestException;
import io.continual.services.model.core.exceptions.ModelSchemaViolationException;
import io.continual.services.model.core.exceptions.ModelServiceException;
import io.continual.services.model.impl.common.BasicModelRequestContextBuilder;
import io.continual.services.model.impl.common.SimpleTraversal;
import io.continual.util.data.json.JsonVisitor;
import io.continual.util.naming.Path;
public abstract class CommonJsonDbModel extends SimpleService implements Model
{
public CommonJsonDbModel ( ServiceContainer sc, JSONObject config )
{
this ( config.getString ( "modelId" ), config.optBoolean ( "readOnly", false ) );
}
public CommonJsonDbModel ( String modelId )
{
this ( modelId, false );
}
public CommonJsonDbModel ( String modelId, boolean readOnly )
{
fModelId = modelId;
fReadOnly = readOnly;
}
@Override
public void close () throws IOException
{
}
@Override
public ModelRequestContextBuilder getRequestContextBuilder ()
{
return new BasicModelRequestContextBuilder ();
}
@Override
public String getId ()
{
return fModelId;
}
@Override
public long getMaxSerializedObjectLength ()
{
// arbitrary default limit - 1GB
return 1024L * 1024L * 1024L;
}
@Override
public long getMaxPathLength ()
{
// arbitrary default limit - 1KB
return 1024L;
}
@Override
public long getMaxRelnNameLength ()
{
// arbitrary default limit - 1KB
return 1024L;
}
@Override
public boolean exists ( ModelRequestContext context, Path objectPath ) throws ModelServiceException, ModelRequestException
{
if ( context.knownToNotExist ( objectPath ) ) return false;
final boolean result = objectExists ( context, objectPath );
if ( !result )
{
context.doesNotExist ( objectPath );
}
return result;
}
@Override
public T load ( ModelRequestContext context, Path objectPath, ModelObjectFactory factory, K userContext ) throws ModelItemDoesNotExistException, ModelServiceException, ModelRequestException
{
if ( context.knownToNotExist ( objectPath ) )
{
throw new ModelItemDoesNotExistException ( objectPath );
}
ModelDataTransfer ld = context.get ( objectPath, ModelDataTransfer.class );
if ( ld == null )
{
ld = loadObject ( context, objectPath );
if ( ld == null )
{
context.doesNotExist ( objectPath );
throw new ModelItemDoesNotExistException ( objectPath );
}
context.put ( objectPath, ld );
}
final ModelDataTransfer ldf = ld;
final ModelObjectFactory.ObjectCreateContext createContext = new ModelObjectFactory.ObjectCreateContext ()
{
@Override
public ModelObjectMetadata getMetadata () { return ldf.getMetadata (); }
@Override
public ModelObject getData () { return ldf.getObjectData (); }
@Override
public K getUserContext () { return userContext; }
};
return factory.create ( createContext );
}
@Override
public ObjectUpdater createUpdate ( final ModelRequestContext context, final Path objectPath ) throws ModelRequestException, ModelServiceException
{
checkReadOnly ();
return new ObjectUpdater ()
{
@Override
public ObjectUpdater overwriteData ( ModelObject withData )
{
fUpdates.add ( new Update ( UpdateType.OVERWRITE_DATA, withData ) );
return this;
}
@Override
public ObjectUpdater mergeData ( ModelObject withData )
{
fUpdates.add ( new Update ( UpdateType.MERGE_DATA, withData ) );
return this;
}
@Override
public ObjectUpdater replaceAcl ( AccessControlList acl )
{
fUpdates.add ( new Update ( acl ) );
return this;
}
@Override
public ObjectUpdater addTypeLock ( String typeId )
{
fUpdates.add ( new Update ( UpdateType.ADD_TYPE_LOCK, typeId ) );
return this;
}
@Override
public ObjectUpdater removeTypeLock ( String typeId )
{
fUpdates.add ( new Update ( UpdateType.REMOVE_TYPE_LOCK, typeId ) );
return this;
}
@Override
public void execute () throws ModelRequestException, ModelSchemaViolationException, ModelServiceException
{
try
{
final boolean isCreate = !exists ( context, objectPath );
final ModelObjectMetadata meta;
final CommonObjectData data;
if ( isCreate )
{
meta = new CommonModelObjectMetadata ();
final Identity id = context.getOperator ();
if ( id != null )
{
meta.getAccessControlList ()
.setOwner ( id.getId () )
.permit ( AccessControlEntry.kOwner, ModelOperation.kAllOperationStrings )
;
}
else
{
meta.getAccessControlList ()
.addAclEntry ( AccessControlEntry.builder ().permit ().forAllUsers ().forAnyOperation ().build () )
;
}
data = new CommonObjectData ();
}
else
{
final BasicModelObject o = load ( context, objectPath );
meta = o.getMetadata ();
data = new CommonObjectData ( o.getData () );
}
for ( Update mu : fUpdates )
{
final AccessControlList acl = meta.getAccessControlList ();
final ModelOperation[] accessList = mu.getAccessRequired ();
for ( ModelOperation access : accessList )
{
final Identity id = context.getOperator ();
if ( !acl.canUser ( id, access.toString () ) )
{
final String userId = id == null ? "Anonymous" : id.getId ();
throw new ModelRequestException ( userId + " may not " + access + " " + objectPath.toString () + "." );
}
}
mu.update ( context, meta, data );
}
// validate the update
final ModelSchemaRegistry schemas = context.getSchemaRegistry ();
for ( String type : meta.getLockedTypes () )
{
final ModelSchema ms = schemas.getSchema ( type );
if ( ms == null )
{
throw new ModelRequestException ( "Unknown type " + type );
}
final ValidationResult vr = ms.isValid ( data );
if ( !vr.isValid () )
{
throw new ModelRequestException ( "The object does not meet type " + type,
new JSONObject ()
.put ( "validationProblems", JsonVisitor.listToArray ( vr.getProblems () ) )
);
}
}
final ModelDataTransfer mdt = new ModelDataTransfer ()
{
@Override
public ModelObjectMetadata getMetadata () { return meta; }
@Override
public ModelObject getObjectData () { return data; }
};
internalStore ( context, objectPath, mdt );
log.info ( "wrote {}", objectPath );
context.put ( objectPath, mdt );
final ModelNotificationService ns = context.getNotificationService();
if ( isCreate )
{
ns.onObjectCreate ( objectPath );
}
else
{
ns.onObjectUpdate ( objectPath );
}
}
catch ( IamSvcException e )
{
throw new ModelServiceException ( e );
}
}
private final LinkedList fUpdates = new LinkedList<> ();
};
}
private enum UpdateType
{
OVERWRITE_DATA,
MERGE_DATA,
ACL,
ADD_TYPE_LOCK,
REMOVE_TYPE_LOCK
}
private class Update
{
public void update ( ModelRequestContext context, ModelObjectMetadata meta, CommonObjectData workingData )
{
switch ( fType )
{
case ACL:
final AccessControlList targetAcl = meta.getAccessControlList ();
targetAcl.clear ();
targetAcl.setOwner ( fAcl.getOwner () );
for ( AccessControlEntry e : fAcl.getEntries () )
{
targetAcl.addAclEntry ( e );
}
break;
case OVERWRITE_DATA:
workingData.clear ();
// no break...
case MERGE_DATA:
workingData.merge ( fData );
break;
case ADD_TYPE_LOCK:
meta.getLockedTypes ().add ( fTypeId );
break;
case REMOVE_TYPE_LOCK:
meta.getLockedTypes ().remove ( fTypeId );
break;
default:
throw new RuntimeException ( "Unknown update type." );
}
}
public ModelOperation[] getAccessRequired ()
{
if ( fType == UpdateType.ACL )
{
return new ModelOperation[] { ModelOperation.ACL_UPDATE };
}
else
{
return new ModelOperation[] { ModelOperation.UPDATE };
}
}
private Update ( AccessControlList acl )
{
fType = UpdateType.ACL;
fData = null;
fTypeId = null;
fAcl = acl;
}
private Update ( UpdateType ut, ModelObject data )
{
fType = ut;
fData = data;
fTypeId = null;
fAcl = null;
}
private Update ( UpdateType ut, String typeId )
{
fType = ut;
fData = null;
fTypeId = typeId;
fAcl = null;
}
public final UpdateType fType;
public final ModelObject fData;
public final AccessControlList fAcl;
public final String fTypeId;
}
@Override
public boolean remove ( ModelRequestContext context, Path objectPath ) throws ModelServiceException, ModelRequestException
{
checkReadOnly ();
final boolean result = internalRemove ( context, objectPath );
context.remove ( objectPath );
log.info ( "removed {}", objectPath );
context.getNotificationService().onObjectDelete ( objectPath );
return result;
}
@Override
public Model createIndex ( String field ) throws ModelRequestException, ModelServiceException
{
checkReadOnly ();
return this;
}
@Override
public ModelTraversal startTraversal () throws ModelRequestException
{
return new SimpleTraversal ( this );
}
@Override
public RelationSelector selectRelations ( Path objectPath )
{
return new CommonRelationSelector ( this, objectPath );
}
private final String fModelId;
private final boolean fReadOnly;
protected boolean objectExists ( ModelRequestContext context, Path objectPath ) throws ModelServiceException, ModelRequestException
{
try
{
load ( context, objectPath );
return true;
}
catch ( ModelItemDoesNotExistException e )
{
return false;
}
}
protected interface ModelDataTransfer
{
ModelObjectMetadata getMetadata ();
ModelObject getObjectData ();
}
protected abstract ModelDataTransfer loadObject ( ModelRequestContext context, Path objectPath ) throws ModelItemDoesNotExistException, ModelServiceException, ModelRequestException;
protected abstract void internalStore ( ModelRequestContext context, Path objectPath, ModelDataTransfer o ) throws ModelRequestException, ModelServiceException;
protected abstract boolean internalRemove ( ModelRequestContext context, Path objectPath ) throws ModelRequestException, ModelServiceException;
@Deprecated
public static final String kMetadataTag = "Ⓜ";
@Deprecated
public static final String kUserDataTag = "Ⓤ";
/**
* Get inbound related objects with a given name from a given object
* @param context
* @param forObject
* @param named send null to retrieve any
* @return a list of 0 or more relations, with getTo set to forObject and getName set to named
* @throws ModelServiceException
* @throws ModelRequestException
*/
@Deprecated
public abstract List getInboundRelationsNamed ( ModelRequestContext context, Path forObject, String named ) throws ModelServiceException, ModelRequestException;
/**
* Get outbound related objects with a given name from a given object
* @param context
* @param forObject
* @param named
* @return a list of 0 or more relations, with getFrom set to forObject and getName set to named
* @throws ModelServiceException
* @throws ModelRequestException
*/
@Deprecated
public abstract List getOutboundRelationsNamed ( ModelRequestContext context, Path forObject, String named ) throws ModelServiceException, ModelRequestException;
private static final Logger log = LoggerFactory.getLogger ( CommonJsonDbModel.class );
protected void checkReadOnly () throws ModelRequestException
{
if ( fReadOnly ) throw new ModelRequestException ( "This model was loaded as read-only." );
}
}
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