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A Reactive Streams implementation of the MongoDB Java driver
/*
* Copyright 2008-present MongoDB, Inc.
*
* 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.mongodb.reactivestreams.client.internal;
import com.mongodb.ContextProvider;
import com.mongodb.MongoClientException;
import com.mongodb.MongoException;
import com.mongodb.MongoInternalException;
import com.mongodb.MongoQueryException;
import com.mongodb.MongoSocketException;
import com.mongodb.MongoTimeoutException;
import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.RequestContext;
import com.mongodb.internal.IgnorableRequestContext;
import com.mongodb.internal.binding.AsyncClusterAwareReadWriteBinding;
import com.mongodb.internal.binding.AsyncClusterBinding;
import com.mongodb.internal.binding.AsyncReadWriteBinding;
import com.mongodb.internal.operation.AsyncReadOperation;
import com.mongodb.internal.operation.AsyncWriteOperation;
import com.mongodb.lang.Nullable;
import com.mongodb.reactivestreams.client.ClientSession;
import com.mongodb.reactivestreams.client.ReactiveContextProvider;
import com.mongodb.reactivestreams.client.internal.crypt.Crypt;
import com.mongodb.reactivestreams.client.internal.crypt.CryptBinding;
import org.reactivestreams.Subscriber;
import reactor.core.publisher.Mono;
import static com.mongodb.MongoException.TRANSIENT_TRANSACTION_ERROR_LABEL;
import static com.mongodb.MongoException.UNKNOWN_TRANSACTION_COMMIT_RESULT_LABEL;
import static com.mongodb.ReadPreference.primary;
import static com.mongodb.assertions.Assertions.notNull;
import static com.mongodb.reactivestreams.client.internal.MongoOperationPublisher.sinkToCallback;
/**
* This class is not part of the public API and may be removed or changed at any time
*/
public class OperationExecutorImpl implements OperationExecutor {
private final MongoClientImpl mongoClient;
private final ClientSessionHelper clientSessionHelper;
private final ReactiveContextProvider contextProvider;
OperationExecutorImpl(final MongoClientImpl mongoClient, final ClientSessionHelper clientSessionHelper) {
this.mongoClient = mongoClient;
this.clientSessionHelper = clientSessionHelper;
ContextProvider contextProvider = mongoClient.getSettings().getContextProvider();
if (contextProvider != null && !(contextProvider instanceof ReactiveContextProvider)) {
throw new IllegalArgumentException("The contextProvider must be an instance of "
+ ReactiveContextProvider.class.getName() + " when using the Reactive Streams driver");
}
this.contextProvider = (ReactiveContextProvider) contextProvider;
}
@Override
public Mono execute(final AsyncReadOperation operation, final ReadPreference readPreference, final ReadConcern readConcern,
@Nullable final ClientSession session) {
notNull("operation", operation);
notNull("readPreference", readPreference);
notNull("readConcern", readConcern);
if (session != null) {
session.notifyOperationInitiated(operation);
}
return Mono.from(subscriber ->
clientSessionHelper.withClientSession(session, this)
.map(clientSession -> getReadWriteBinding(getContext(subscriber), readPreference, readConcern, clientSession,
session == null && clientSession != null))
.switchIfEmpty(Mono.fromCallable(() ->
getReadWriteBinding(getContext(subscriber), readPreference, readConcern, session, false)))
.flatMap(binding -> {
if (session != null && session.hasActiveTransaction() && !binding.getReadPreference().equals(primary())) {
binding.release();
return Mono.error(new MongoClientException("Read preference in a transaction must be primary"));
} else {
return Mono.create(sink -> operation.executeAsync(binding, (result, t) -> {
try {
binding.release();
} finally {
sinkToCallback(sink).onResult(result, t);
}
})).doOnError((t) -> {
labelException(session, t);
unpinServerAddressOnTransientTransactionError(session, t);
});
}
}).subscribe(subscriber)
);
}
@Override
public Mono execute(final AsyncWriteOperation operation, final ReadConcern readConcern,
@Nullable final ClientSession session) {
notNull("operation", operation);
notNull("readConcern", readConcern);
if (session != null) {
session.notifyOperationInitiated(operation);
}
return Mono.from(subscriber ->
clientSessionHelper.withClientSession(session, this)
.map(clientSession -> getReadWriteBinding(getContext(subscriber), primary(), readConcern,
clientSession, session == null && clientSession != null))
.switchIfEmpty(Mono.fromCallable(() ->
getReadWriteBinding(getContext(subscriber), primary(), readConcern, session, false)))
.flatMap(binding ->
Mono.create(sink -> operation.executeAsync(binding, (result, t) -> {
try {
binding.release();
} finally {
sinkToCallback(sink).onResult(result, t);
}
})).doOnError((t) -> {
labelException(session, t);
unpinServerAddressOnTransientTransactionError(session, t);
})
).subscribe(subscriber)
);
}
private RequestContext getContext(final Subscriber subscriber) {
RequestContext context = null;
if (contextProvider != null) {
context = contextProvider.getContext(subscriber);
}
return context == null ? IgnorableRequestContext.INSTANCE : context;
}
private void labelException(@Nullable final ClientSession session, @Nullable final Throwable t) {
if (session != null && session.hasActiveTransaction()
&& (t instanceof MongoSocketException || t instanceof MongoTimeoutException
|| (t instanceof MongoQueryException && ((MongoQueryException) t).getErrorCode() == 91))
&& !((MongoException) t).hasErrorLabel(UNKNOWN_TRANSACTION_COMMIT_RESULT_LABEL)) {
((MongoException) t).addLabel(TRANSIENT_TRANSACTION_ERROR_LABEL);
}
}
private void unpinServerAddressOnTransientTransactionError(@Nullable final ClientSession session,
@Nullable final Throwable throwable) {
if (session != null && throwable instanceof MongoException
&& ((MongoException) throwable).hasErrorLabel(TRANSIENT_TRANSACTION_ERROR_LABEL)) {
session.clearTransactionContext();
}
}
private AsyncReadWriteBinding getReadWriteBinding(final RequestContext requestContext, final ReadPreference readPreference,
final ReadConcern readConcern, @Nullable final ClientSession session, final boolean ownsSession) {
notNull("readPreference", readPreference);
AsyncClusterAwareReadWriteBinding readWriteBinding = new AsyncClusterBinding(mongoClient.getCluster(),
getReadPreferenceForBinding(readPreference, session), readConcern, mongoClient.getSettings().getServerApi(), requestContext);
Crypt crypt = mongoClient.getCrypt();
if (crypt != null) {
readWriteBinding = new CryptBinding(readWriteBinding, crypt);
}
AsyncClusterAwareReadWriteBinding asyncReadWriteBinding = readWriteBinding;
if (session != null) {
return new ClientSessionBinding(session, ownsSession, asyncReadWriteBinding);
} else {
return asyncReadWriteBinding;
}
}
private ReadPreference getReadPreferenceForBinding(final ReadPreference readPreference, @Nullable final ClientSession session) {
if (session == null) {
return readPreference;
}
if (session.hasActiveTransaction()) {
ReadPreference readPreferenceForBinding = session.getTransactionOptions().getReadPreference();
if (readPreferenceForBinding == null) {
throw new MongoInternalException("Invariant violated. Transaction options read preference can not be null");
}
return readPreferenceForBinding;
}
return readPreference;
}
}
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