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Java idiomatic client for Google Cloud Spanner.
/*
* Copyright 2019 Google LLC
*
* 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.google.cloud.spanner;
import static com.google.cloud.spanner.SpannerExceptionFactory.newSpannerBatchUpdateException;
import static com.google.cloud.spanner.SpannerExceptionFactory.newSpannerException;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import com.google.api.core.ApiFuture;
import com.google.api.core.ApiFutures;
import com.google.api.core.SettableApiFuture;
import com.google.cloud.Timestamp;
import com.google.cloud.spanner.Options.QueryOption;
import com.google.cloud.spanner.Options.ReadOption;
import com.google.cloud.spanner.Options.TransactionOption;
import com.google.cloud.spanner.Options.UpdateOption;
import com.google.cloud.spanner.SessionImpl.SessionTransaction;
import com.google.cloud.spanner.spi.v1.SpannerRpc;
import com.google.cloud.spanner.spi.v1.SpannerRpc.Option;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.protobuf.ByteString;
import com.google.protobuf.Empty;
import com.google.rpc.Code;
import com.google.spanner.v1.CommitRequest;
import com.google.spanner.v1.ExecuteBatchDmlRequest;
import com.google.spanner.v1.ExecuteBatchDmlResponse;
import com.google.spanner.v1.ExecuteSqlRequest;
import com.google.spanner.v1.ExecuteSqlRequest.QueryMode;
import com.google.spanner.v1.RequestOptions;
import com.google.spanner.v1.ResultSet;
import com.google.spanner.v1.ResultSetStats;
import com.google.spanner.v1.RollbackRequest;
import com.google.spanner.v1.Transaction;
import com.google.spanner.v1.TransactionOptions;
import com.google.spanner.v1.TransactionSelector;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Nullable;
import javax.annotation.concurrent.GuardedBy;
/** Default implementation of {@link TransactionRunner}. */
class TransactionRunnerImpl implements SessionTransaction, TransactionRunner {
private static final Logger txnLogger = Logger.getLogger(TransactionRunner.class.getName());
/**
* (Part of) the error message that is returned by Cloud Spanner if a transaction is cancelled
* because it was invalidated by a later transaction in the same session.
*/
private static final String TRANSACTION_CANCELLED_MESSAGE = "invalidated by a later transaction";
private static final String TRANSACTION_ALREADY_COMMITTED_MESSAGE =
"Transaction has already committed";
private static final String DML_INVALID_EXCLUDE_CHANGE_STREAMS_OPTION_MESSAGE =
"Options.excludeTxnFromChangeStreams() cannot be specified for individual DML requests. "
+ "This option should be set at the transaction level.";
@VisibleForTesting
static class TransactionContextImpl extends AbstractReadContext implements TransactionContext {
static class Builder extends AbstractReadContext.Builder {
private Clock clock = new Clock();
private ByteString transactionId;
private Options options;
private boolean trackTransactionStarter;
private Builder() {}
Builder setClock(Clock clock) {
this.clock = Preconditions.checkNotNull(clock);
return self();
}
Builder setTransactionId(ByteString transactionId) {
this.transactionId = transactionId;
return self();
}
Builder setOptions(Options options) {
this.options = Preconditions.checkNotNull(options);
return self();
}
Builder setTrackTransactionStarter(boolean trackTransactionStarter) {
this.trackTransactionStarter = trackTransactionStarter;
return self();
}
@Override
TransactionContextImpl build() {
Preconditions.checkState(this.options != null, "Options must be set");
return new TransactionContextImpl(this);
}
}
static Builder newBuilder() {
return new Builder();
}
/**
* {@link AsyncResultSet} implementation that keeps track of the async operations that are still
* running for this {@link TransactionContext} and that should finish before the {@link
* TransactionContext} can commit and release its session back into the pool.
*/
private class TransactionContextAsyncResultSetImpl extends ForwardingAsyncResultSet
implements ListenableAsyncResultSet {
private TransactionContextAsyncResultSetImpl(ListenableAsyncResultSet delegate) {
super(delegate);
}
@Override
public ApiFuture setCallback(Executor exec, ReadyCallback cb) {
Runnable listener = TransactionContextImpl.this::decreaseAsyncOperations;
try {
increaseAsyncOperations();
addListener(listener);
return super.setCallback(exec, cb);
} catch (Throwable t) {
removeListener(listener);
decreaseAsyncOperations();
throw t;
}
}
@Override
public void addListener(Runnable listener) {
((ListenableAsyncResultSet) this.delegate).addListener(listener);
}
@Override
public void removeListener(Runnable listener) {
((ListenableAsyncResultSet) this.delegate).removeListener(listener);
}
}
private final Object committingLock = new Object();
@GuardedBy("committingLock")
private volatile boolean committing;
@GuardedBy("lock")
private volatile SettableApiFuture finishedAsyncOperations = SettableApiFuture.create();
@GuardedBy("lock")
private volatile int runningAsyncOperations;
private final Queue mutations = new ConcurrentLinkedQueue<>();
@GuardedBy("lock")
private boolean aborted;
private final Options options;
/** Default to -1 to indicate not available. */
@GuardedBy("lock")
private long retryDelayInMillis = -1L;
/**
* transactionIdFuture will return the transaction id returned by the first statement in the
* transaction if the BeginTransaction option is included with the first statement of the
* transaction.
*/
@VisibleForTesting volatile SettableApiFuture transactionIdFuture = null;
@VisibleForTesting long waitForTransactionTimeoutMillis = 60_000L;
private final boolean trackTransactionStarter;
private Exception transactionStarter;
volatile ByteString transactionId;
private CommitResponse commitResponse;
private final Clock clock;
private final Map channelHint;
private TransactionContextImpl(Builder builder) {
super(builder);
this.transactionId = builder.transactionId;
this.trackTransactionStarter = builder.trackTransactionStarter;
this.options = builder.options;
this.finishedAsyncOperations.set(null);
this.clock = builder.clock;
this.channelHint =
getChannelHintOptions(
session.getOptions(), ThreadLocalRandom.current().nextLong(Long.MAX_VALUE));
}
@Override
protected boolean isRouteToLeader() {
return true;
}
private void increaseAsyncOperations() {
synchronized (lock) {
if (runningAsyncOperations == 0) {
finishedAsyncOperations = SettableApiFuture.create();
}
runningAsyncOperations++;
}
}
private void decreaseAsyncOperations() {
synchronized (lock) {
runningAsyncOperations--;
if (runningAsyncOperations == 0) {
finishedAsyncOperations.set(null);
}
}
}
@Override
public void close() {
// Only mark the context as closed, but do not end the tracer span, as that is done by the
// commit and rollback methods.
synchronized (lock) {
isClosed = true;
}
}
void ensureTxn() {
try {
ensureTxnAsync().get();
} catch (ExecutionException e) {
throw SpannerExceptionFactory.newSpannerException(e.getCause() == null ? e : e.getCause());
} catch (InterruptedException e) {
throw SpannerExceptionFactory.propagateInterrupt(e);
}
}
ApiFuture ensureTxnAsync() {
final SettableApiFuture res = SettableApiFuture.create();
if (transactionId == null || isAborted()) {
createTxnAsync(res);
} else {
span.addAnnotation("Transaction Initialized", "Id", transactionId.toStringUtf8());
txnLogger.log(
Level.FINER,
"Using prepared transaction {0}",
txnLogger.isLoggable(Level.FINER) ? transactionId.asReadOnlyByteBuffer() : null);
res.set(null);
}
return res;
}
private void createTxnAsync(final SettableApiFuture res) {
span.addAnnotation("Creating Transaction");
final ApiFuture fut = session.beginTransactionAsync(options, isRouteToLeader());
fut.addListener(
() -> {
try {
transactionId = fut.get();
span.addAnnotation("Transaction Creation Done", "Id", transactionId.toStringUtf8());
txnLogger.log(
Level.FINER,
"Started transaction {0}",
txnLogger.isLoggable(Level.FINER) ? transactionId.asReadOnlyByteBuffer() : null);
res.set(null);
} catch (ExecutionException e) {
span.addAnnotation(
"Transaction Creation Failed", e.getCause() == null ? e : e.getCause());
res.setException(e.getCause() == null ? e : e.getCause());
} catch (InterruptedException e) {
res.setException(SpannerExceptionFactory.propagateInterrupt(e));
}
},
MoreExecutors.directExecutor());
}
void commit() {
try {
commitResponse = commitAsync().get();
} catch (InterruptedException e) {
if (commitFuture != null) {
commitFuture.cancel(true);
}
throw SpannerExceptionFactory.propagateInterrupt(e);
} catch (ExecutionException e) {
throw SpannerExceptionFactory.newSpannerException(e.getCause() == null ? e : e.getCause());
}
}
volatile ApiFuture commitFuture;
ApiFuture commitAsync() {
close();
List mutationsProto = new ArrayList<>();
synchronized (committingLock) {
if (committing) {
throw new IllegalStateException(TRANSACTION_ALREADY_COMMITTED_MESSAGE);
}
committing = true;
if (!mutations.isEmpty()) {
Mutation.toProto(mutations, mutationsProto);
}
}
final SettableApiFuture res = SettableApiFuture.create();
final SettableApiFuture finishOps;
CommitRequest.Builder builder =
CommitRequest.newBuilder()
.setSession(session.getName())
.setReturnCommitStats(options.withCommitStats());
if (options.hasPriority() || getTransactionTag() != null) {
RequestOptions.Builder requestOptionsBuilder = RequestOptions.newBuilder();
if (options.hasPriority()) {
requestOptionsBuilder.setPriority(options.priority());
}
if (getTransactionTag() != null) {
requestOptionsBuilder.setTransactionTag(getTransactionTag());
}
builder.setRequestOptions(requestOptionsBuilder.build());
}
if (options.hasMaxCommitDelay()) {
builder.setMaxCommitDelay(
com.google.protobuf.Duration.newBuilder()
.setSeconds(options.maxCommitDelay().getSeconds())
.setNanos(options.maxCommitDelay().getNano())
.build());
}
synchronized (lock) {
if (transactionIdFuture == null && transactionId == null && runningAsyncOperations == 0) {
finishOps = SettableApiFuture.create();
createTxnAsync(finishOps);
} else {
finishOps = finishedAsyncOperations;
}
}
builder.addAllMutations(mutationsProto);
finishOps.addListener(
new CommitRunnable(res, finishOps, builder), MoreExecutors.directExecutor());
return res;
}
private final class CommitRunnable implements Runnable {
private final SettableApiFuture res;
private final ApiFuture prev;
private final CommitRequest.Builder requestBuilder;
CommitRunnable(
SettableApiFuture res,
ApiFuture prev,
CommitRequest.Builder requestBuilder) {
this.res = res;
this.prev = prev;
this.requestBuilder = requestBuilder;
}
@Override
public void run() {
try {
prev.get();
if (transactionId == null && transactionIdFuture == null) {
requestBuilder.setSingleUseTransaction(
TransactionOptions.newBuilder()
.setReadWrite(TransactionOptions.ReadWrite.getDefaultInstance())
.setExcludeTxnFromChangeStreams(
options.withExcludeTxnFromChangeStreams() == Boolean.TRUE));
} else {
requestBuilder.setTransactionId(
transactionId == null
? transactionIdFuture.get(
waitForTransactionTimeoutMillis, TimeUnit.MILLISECONDS)
: transactionId);
}
if (options.hasPriority() || getTransactionTag() != null) {
RequestOptions.Builder requestOptionsBuilder = RequestOptions.newBuilder();
if (options.hasPriority()) {
requestOptionsBuilder.setPriority(options.priority());
}
if (getTransactionTag() != null) {
requestOptionsBuilder.setTransactionTag(getTransactionTag());
}
requestBuilder.setRequestOptions(requestOptionsBuilder.build());
}
final CommitRequest commitRequest = requestBuilder.build();
span.addAnnotation("Starting Commit");
final ISpan opSpan = tracer.spanBuilderWithExplicitParent(SpannerImpl.COMMIT, span);
final ApiFuture commitFuture =
rpc.commitAsync(commitRequest, session.getOptions());
session.markUsed(clock.instant());
commitFuture.addListener(
() -> {
try (IScope s = tracer.withSpan(opSpan)) {
com.google.spanner.v1.CommitResponse proto = commitFuture.get();
if (!proto.hasCommitTimestamp()) {
throw newSpannerException(
ErrorCode.INTERNAL, "Missing commitTimestamp:\n" + session.getName());
}
span.addAnnotation("Commit Done");
opSpan.end();
res.set(new CommitResponse(proto));
} catch (Throwable e) {
if (e instanceof ExecutionException) {
e =
SpannerExceptionFactory.newSpannerException(
e.getCause() == null ? e : e.getCause());
} else if (e instanceof InterruptedException) {
e = SpannerExceptionFactory.propagateInterrupt((InterruptedException) e);
} else {
e = SpannerExceptionFactory.newSpannerException(e);
}
span.addAnnotation("Commit Failed", e);
opSpan.setStatus(e);
opSpan.end();
res.setException(onError((SpannerException) e, false));
}
},
MoreExecutors.directExecutor());
} catch (InterruptedException e) {
res.setException(SpannerExceptionFactory.propagateInterrupt(e));
} catch (TimeoutException e) {
res.setException(SpannerExceptionFactory.propagateTimeout(e));
} catch (ExecutionException e) {
res.setException(
SpannerExceptionFactory.newSpannerException(e.getCause() == null ? e : e.getCause()));
} catch (Throwable e) {
res.setException(
SpannerExceptionFactory.newSpannerException(e.getCause() == null ? e : e.getCause()));
}
}
}
CommitResponse getCommitResponse() {
checkState(commitResponse != null, "run() has not yet returned normally");
return commitResponse;
}
boolean isAborted() {
synchronized (lock) {
return aborted;
}
}
void rollback() {
try {
rollbackAsync().get();
} catch (ExecutionException e) {
txnLogger.log(Level.FINE, "Exception during rollback", e);
span.addAnnotation("Rollback Failed", e);
} catch (InterruptedException e) {
throw SpannerExceptionFactory.propagateInterrupt(e);
}
}
ApiFuture rollbackAsync() {
close();
// It could be that there is no transaction if the transaction has been marked
// withInlineBegin, and there has not been any query/update statement that has been executed.
// In that case, we do not need to do anything, as there is no transaction.
//
// We do not take the transactionLock before trying to rollback to prevent a rollback call
// from blocking if an async query or update statement that is trying to begin the transaction
// is still in flight. That transaction will then automatically be terminated by the server.
if (transactionId != null) {
span.addAnnotation("Starting Rollback");
ApiFuture apiFuture =
rpc.rollbackAsync(
RollbackRequest.newBuilder()
.setSession(session.getName())
.setTransactionId(transactionId)
.build(),
session.getOptions());
session.markUsed(clock.instant());
return apiFuture;
} else {
return ApiFutures.immediateFuture(Empty.getDefaultInstance());
}
}
@Nullable
@Override
TransactionSelector getTransactionSelector() {
// Check if there is already a transactionId available. That is the case if this transaction
// has already been prepared by the session pool, or if this transaction has been marked
// withInlineBegin and an earlier statement has already started a transaction.
if (transactionId == null) {
try {
ApiFuture tx = null;
synchronized (lock) {
// The first statement of a transaction that gets here will be the one that includes
// BeginTransaction with the statement. The others will be waiting on the
// transactionIdFuture until an actual transactionId is available.
if (transactionIdFuture == null) {
transactionIdFuture = SettableApiFuture.create();
if (trackTransactionStarter) {
transactionStarter = new Exception("Requesting new transaction");
}
} else {
tx = transactionIdFuture;
}
}
if (tx == null) {
return TransactionSelector.newBuilder()
.setBegin(SessionImpl.createReadWriteTransactionOptions(options))
.build();
} else {
// Wait for the transaction to come available. The tx.get() call will fail with an
// Aborted error if the call that included the BeginTransaction option fails. The
// Aborted error will cause the entire transaction to be retried, and the retry will use
// a separate BeginTransaction RPC.
// If tx.get() returns successfully, this.transactionId will also have been set to a
// valid value as the latter is always set when a transaction id is returned by a
// statement.
return TransactionSelector.newBuilder()
.setId(tx.get(waitForTransactionTimeoutMillis, TimeUnit.MILLISECONDS))
.build();
}
} catch (ExecutionException e) {
if (e.getCause() instanceof AbortedException) {
synchronized (lock) {
aborted = true;
}
}
throw SpannerExceptionFactory.newSpannerException(e.getCause());
} catch (TimeoutException e) {
// Throw an ABORTED exception to force a retry of the transaction if no transaction
// has been returned by the first statement.
SpannerException se =
SpannerExceptionFactory.newSpannerException(
ErrorCode.ABORTED,
"Timeout while waiting for a transaction to be returned by another statement."
+ (trackTransactionStarter
? " See the suppressed exception for the stacktrace of the caller that should return a transaction"
: ""),
e);
if (transactionStarter != null) {
se.addSuppressed(transactionStarter);
}
throw se;
} catch (InterruptedException e) {
throw SpannerExceptionFactory.newSpannerExceptionForCancellation(null, e);
}
}
// There is already a transactionId available. Include that id as the transaction to use.
return TransactionSelector.newBuilder().setId(transactionId).build();
}
@Override
Map getTransactionChannelHint() {
return channelHint;
}
@Override
public void onTransactionMetadata(Transaction transaction, boolean shouldIncludeId) {
Preconditions.checkNotNull(transaction);
if (transaction.getId() != ByteString.EMPTY) {
// A transaction has been returned by a statement that was executed. Set the id of the
// transaction on this instance and release the lock to allow other statements to proceed.
if ((transactionIdFuture == null || !this.transactionIdFuture.isDone())
&& this.transactionId == null) {
this.transactionId = transaction.getId();
this.transactionIdFuture.set(transaction.getId());
}
} else if (shouldIncludeId) {
// The statement should have returned a transaction.
throw SpannerExceptionFactory.newSpannerException(
ErrorCode.FAILED_PRECONDITION, AbstractReadContext.NO_TRANSACTION_RETURNED_MSG);
}
}
@Nullable
String getTransactionTag() {
if (this.options.hasTag()) {
return this.options.tag();
}
return null;
}
@Override
public SpannerException onError(SpannerException e, boolean withBeginTransaction) {
// If the statement that caused an error was the statement that included a BeginTransaction
// option, we simulate an aborted transaction to force a retry of the entire transaction. This
// will cause the retry to execute an explicit BeginTransaction RPC and then the actual
// statements of the transaction. This is needed as the first statement of the transaction
// must be included with the transaction to ensure that any locks that are taken by the
// statement are included in the transaction, even if the statement again causes an error
// during the retry.
if (withBeginTransaction) {
// Simulate an aborted transaction to force a retry with a new transaction.
this.transactionIdFuture.setException(
SpannerExceptionFactory.newSpannerException(
ErrorCode.ABORTED,
"Aborted due to failed initial statement",
SpannerExceptionFactory.createAbortedExceptionWithRetryDelay(
"Aborted due to failed initial statement", e, 0, 1)));
}
SpannerException exceptionToThrow;
if (withBeginTransaction
&& e.getErrorCode() == ErrorCode.CANCELLED
&& e.getMessage().contains(TRANSACTION_CANCELLED_MESSAGE)) {
// If the first statement of a transaction fails because it was invalidated by a later
// transaction, then the transaction should be retried with an explicit BeginTransaction
// RPC. It could be that this occurred because of a previous transaction that timed out or
// was cancelled by the client, but that was sent to Cloud Spanner and that was still active
// on the backend.
exceptionToThrow =
SpannerExceptionFactory.newSpannerException(
ErrorCode.ABORTED,
e.getMessage(),
SpannerExceptionFactory.createAbortedExceptionWithRetryDelay(
"Aborted due to failed initial statement", e, 0, 1));
} else {
exceptionToThrow = e;
}
if (exceptionToThrow.getErrorCode() == ErrorCode.ABORTED) {
long delay = -1L;
if (exceptionToThrow instanceof AbortedException) {
delay = exceptionToThrow.getRetryDelayInMillis();
}
if (delay == -1L) {
txnLogger.log(
Level.FINE, "Retry duration is missing from the exception.", exceptionToThrow);
}
synchronized (lock) {
retryDelayInMillis = delay;
aborted = true;
}
}
return exceptionToThrow;
}
@Override
public void onDone(boolean withBeginTransaction) {
if (withBeginTransaction
&& transactionIdFuture != null
&& !this.transactionIdFuture.isDone()) {
// Context was done (closed) before a transaction id was returned.
this.transactionIdFuture.setException(
SpannerExceptionFactory.newSpannerException(
ErrorCode.FAILED_PRECONDITION,
"ResultSet was closed before a transaction id was returned"));
}
}
@Override
public void buffer(Mutation mutation) {
synchronized (committingLock) {
if (committing) {
throw new IllegalStateException(TRANSACTION_ALREADY_COMMITTED_MESSAGE);
}
mutations.add(checkNotNull(mutation));
}
}
@Override
public ApiFuture bufferAsync(Mutation mutation) {
// Normally, we would call the async method from the sync method, but this is also safe as
// both are non-blocking anyways, and this prevents the creation of an ApiFuture that is not
// really used when the sync method is called.
buffer(mutation);
return ApiFutures.immediateFuture(null);
}
@Override
public void buffer(Iterable mutations) {
synchronized (committingLock) {
if (committing) {
throw new IllegalStateException(TRANSACTION_ALREADY_COMMITTED_MESSAGE);
}
for (Mutation mutation : mutations) {
this.mutations.add(checkNotNull(mutation));
}
}
}
@Override
public ApiFuture bufferAsync(Iterable mutations) {
// Normally, we would call the async method from the sync method, but this is also safe as
// both are non-blocking anyways, and this prevents the creation of an ApiFuture that is not
// really used when the sync method is called.
buffer(mutations);
return ApiFutures.immediateFuture(null);
}
@Override
public ResultSetStats analyzeUpdate(
Statement statement, QueryAnalyzeMode analyzeMode, UpdateOption... options) {
return internalAnalyzeStatement(statement, analyzeMode, options).getStats();
}
@Override
public com.google.cloud.spanner.ResultSet analyzeUpdateStatement(
Statement statement, QueryAnalyzeMode analyzeMode, UpdateOption... options) {
return new NoRowsResultSet(internalAnalyzeStatement(statement, analyzeMode, options));
}
private ResultSet internalAnalyzeStatement(
Statement statement, QueryAnalyzeMode analyzeMode, UpdateOption... options) {
Preconditions.checkNotNull(analyzeMode);
QueryMode queryMode;
switch (analyzeMode) {
case PLAN:
queryMode = QueryMode.PLAN;
break;
case PROFILE:
queryMode = QueryMode.PROFILE;
break;
default:
throw SpannerExceptionFactory.newSpannerException(
ErrorCode.INVALID_ARGUMENT, "Unknown analyze mode: " + analyzeMode);
}
return internalExecuteUpdate(statement, queryMode, options);
}
@Override
public long executeUpdate(Statement statement, UpdateOption... options) {
ResultSet resultSet = internalExecuteUpdate(statement, QueryMode.NORMAL, options);
// For standard DML, using the exact row count.
return resultSet.getStats().getRowCountExact();
}
private ResultSet internalExecuteUpdate(
Statement statement, QueryMode queryMode, UpdateOption... updateOptions) {
beforeReadOrQuery();
final Options options = Options.fromUpdateOptions(updateOptions);
if (options.withExcludeTxnFromChangeStreams() != null) {
throw newSpannerException(
ErrorCode.INVALID_ARGUMENT, DML_INVALID_EXCLUDE_CHANGE_STREAMS_OPTION_MESSAGE);
}
final ExecuteSqlRequest.Builder builder =
getExecuteSqlRequestBuilder(
statement, queryMode, options, /* withTransactionSelector = */ true);
try {
com.google.spanner.v1.ResultSet resultSet =
rpc.executeQuery(builder.build(), session.getOptions(), isRouteToLeader());
session.markUsed(clock.instant());
if (resultSet.getMetadata().hasTransaction()) {
onTransactionMetadata(
resultSet.getMetadata().getTransaction(), builder.getTransaction().hasBegin());
}
if (!resultSet.hasStats()) {
throw new IllegalArgumentException(
"DML response missing stats possibly due to non-DML statement as input");
}
return resultSet;
} catch (Throwable t) {
throw onError(
SpannerExceptionFactory.asSpannerException(t), builder.getTransaction().hasBegin());
}
}
@Override
public ApiFuture executeUpdateAsync(Statement statement, UpdateOption... updateOptions) {
beforeReadOrQuery();
final Options options = Options.fromUpdateOptions(updateOptions);
if (options.withExcludeTxnFromChangeStreams() != null) {
throw newSpannerException(
ErrorCode.INVALID_ARGUMENT, DML_INVALID_EXCLUDE_CHANGE_STREAMS_OPTION_MESSAGE);
}
final ExecuteSqlRequest.Builder builder =
getExecuteSqlRequestBuilder(
statement, QueryMode.NORMAL, options, /* withTransactionSelector = */ true);
final ApiFuture resultSet;
try {
// Register the update as an async operation that must finish before the transaction may
// commit.
increaseAsyncOperations();
resultSet = rpc.executeQueryAsync(builder.build(), session.getOptions(), isRouteToLeader());
session.markUsed(clock.instant());
} catch (Throwable t) {
decreaseAsyncOperations();
throw t;
}
ApiFuture updateCount =
ApiFutures.transform(
resultSet,
input -> {
if (!input.hasStats()) {
throw SpannerExceptionFactory.newSpannerException(
ErrorCode.INVALID_ARGUMENT,
"DML response missing stats possibly due to non-DML statement as input");
}
if (builder.getTransaction().hasBegin()
&& !(input.getMetadata().hasTransaction()
&& input.getMetadata().getTransaction().getId() != ByteString.EMPTY)) {
throw SpannerExceptionFactory.newSpannerException(
ErrorCode.FAILED_PRECONDITION, NO_TRANSACTION_RETURNED_MSG);
}
// For standard DML, using the exact row count.
return input.getStats().getRowCountExact();
},
MoreExecutors.directExecutor());
updateCount =
ApiFutures.catching(
updateCount,
Throwable.class,
input -> {
SpannerException e = SpannerExceptionFactory.asSpannerException(input);
throw onError(e, builder.getTransaction().hasBegin());
},
MoreExecutors.directExecutor());
updateCount.addListener(
() -> {
try {
if (resultSet.get().getMetadata().hasTransaction()) {
onTransactionMetadata(
resultSet.get().getMetadata().getTransaction(),
builder.getTransaction().hasBegin());
}
} catch (Throwable e) {
// Ignore this error here as it is handled by the future that is returned by the
// executeUpdateAsync method.
}
decreaseAsyncOperations();
},
MoreExecutors.directExecutor());
return updateCount;
}
private SpannerException createAbortedExceptionForBatchDml(ExecuteBatchDmlResponse response) {
// Manually construct an AbortedException with a 10ms retry delay for BatchDML responses that
// return an Aborted status (and not an AbortedException).
return newSpannerException(
ErrorCode.fromRpcStatus(response.getStatus()),
response.getStatus().getMessage(),
SpannerExceptionFactory.createAbortedExceptionWithRetryDelay(
response.getStatus().getMessage(),
/* cause = */ null,
/* retryDelaySeconds = */ 0,
/* retryDelayNanos = */ (int) TimeUnit.MILLISECONDS.toNanos(10L)));
}
@Override
public long[] batchUpdate(Iterable statements, UpdateOption... updateOptions) {
beforeReadOrQuery();
final Options options = Options.fromUpdateOptions(updateOptions);
if (options.withExcludeTxnFromChangeStreams() != null) {
throw newSpannerException(
ErrorCode.INVALID_ARGUMENT, DML_INVALID_EXCLUDE_CHANGE_STREAMS_OPTION_MESSAGE);
}
final ExecuteBatchDmlRequest.Builder builder =
getExecuteBatchDmlRequestBuilder(statements, options);
try {
com.google.spanner.v1.ExecuteBatchDmlResponse response =
rpc.executeBatchDml(builder.build(), session.getOptions());
session.markUsed(clock.instant());
long[] results = new long[response.getResultSetsCount()];
for (int i = 0; i < response.getResultSetsCount(); ++i) {
results[i] = response.getResultSets(i).getStats().getRowCountExact();
if (response.getResultSets(i).getMetadata().hasTransaction()) {
onTransactionMetadata(
response.getResultSets(i).getMetadata().getTransaction(),
builder.getTransaction().hasBegin());
}
}
// If one of the DML statements was aborted, we should throw an aborted exception.
// In all other cases, we should throw a BatchUpdateException.
if (response.getStatus().getCode() == Code.ABORTED_VALUE) {
throw createAbortedExceptionForBatchDml(response);
} else if (response.getStatus().getCode() != 0) {
throw newSpannerBatchUpdateException(
ErrorCode.fromRpcStatus(response.getStatus()),
response.getStatus().getMessage(),
results);
}
return results;
} catch (Throwable e) {
throw onError(
SpannerExceptionFactory.asSpannerException(e), builder.getTransaction().hasBegin());
}
}
@Override
public ApiFuture batchUpdateAsync(
Iterable statements, UpdateOption... updateOptions) {
beforeReadOrQuery();
final Options options = Options.fromUpdateOptions(updateOptions);
if (options.withExcludeTxnFromChangeStreams() != null) {
throw newSpannerException(
ErrorCode.INVALID_ARGUMENT, DML_INVALID_EXCLUDE_CHANGE_STREAMS_OPTION_MESSAGE);
}
final ExecuteBatchDmlRequest.Builder builder =
getExecuteBatchDmlRequestBuilder(statements, options);
ApiFuture response;
try {
// Register the update as an async operation that must finish before the transaction may
// commit.
increaseAsyncOperations();
response = rpc.executeBatchDmlAsync(builder.build(), session.getOptions());
session.markUsed(clock.instant());
} catch (Throwable t) {
decreaseAsyncOperations();
throw t;
}
ApiFuture updateCounts =
ApiFutures.transform(
response,
batchDmlResponse -> {
long[] results = new long[batchDmlResponse.getResultSetsCount()];
for (int i = 0; i < batchDmlResponse.getResultSetsCount(); ++i) {
results[i] = batchDmlResponse.getResultSets(i).getStats().getRowCountExact();
if (batchDmlResponse.getResultSets(i).getMetadata().hasTransaction()) {
onTransactionMetadata(
batchDmlResponse.getResultSets(i).getMetadata().getTransaction(),
builder.getTransaction().hasBegin());
}
}
// If one of the DML statements was aborted, we should throw an aborted exception.
// In all other cases, we should throw a BatchUpdateException.
if (batchDmlResponse.getStatus().getCode() == Code.ABORTED_VALUE) {
throw createAbortedExceptionForBatchDml(batchDmlResponse);
} else if (batchDmlResponse.getStatus().getCode() != 0) {
throw newSpannerBatchUpdateException(
ErrorCode.fromRpcStatus(batchDmlResponse.getStatus()),
batchDmlResponse.getStatus().getMessage(),
results);
}
return results;
},
MoreExecutors.directExecutor());
updateCounts =
ApiFutures.catching(
updateCounts,
Throwable.class,
input -> {
SpannerException e = SpannerExceptionFactory.asSpannerException(input);
throw onError(e, builder.getTransaction().hasBegin());
},
MoreExecutors.directExecutor());
updateCounts.addListener(this::decreaseAsyncOperations, MoreExecutors.directExecutor());
return updateCounts;
}
private ListenableAsyncResultSet wrap(ListenableAsyncResultSet delegate) {
return new TransactionContextAsyncResultSetImpl(delegate);
}
@Override
public ListenableAsyncResultSet readAsync(
String table, KeySet keys, Iterable columns, ReadOption... options) {
return wrap(super.readAsync(table, keys, columns, options));
}
@Override
public ListenableAsyncResultSet readUsingIndexAsync(
String table, String index, KeySet keys, Iterable columns, ReadOption... options) {
return wrap(super.readUsingIndexAsync(table, index, keys, columns, options));
}
@Override
public ListenableAsyncResultSet executeQueryAsync(
final Statement statement, final QueryOption... options) {
return wrap(super.executeQueryAsync(statement, options));
}
}
private boolean blockNestedTxn = true;
private final SessionImpl session;
private final Options options;
private ISpan span;
private TraceWrapper tracer;
private TransactionContextImpl txn;
private volatile boolean isValid = true;
@Override
public TransactionRunner allowNestedTransaction() {
blockNestedTxn = false;
return this;
}
TransactionRunnerImpl(SessionImpl session, TransactionOption... options) {
this.session = session;
this.options = Options.fromTransactionOptions(options);
this.txn = session.newTransaction(this.options);
this.tracer = session.getTracer();
}
@Override
public void setSpan(ISpan span) {
this.span = span;
}
@Nullable
@Override
public T run(TransactionCallable callable) {
try (IScope s = tracer.withSpan(span)) {
if (blockNestedTxn) {
SessionImpl.hasPendingTransaction.set(Boolean.TRUE);
}
return runInternal(callable);
} catch (RuntimeException e) {
span.setStatus(e);
throw e;
} finally {
// Remove threadLocal rather than set to FALSE to avoid a possible memory leak.
// We also do this unconditionally in case a user has modified the flag when the transaction
// was running.
SessionImpl.hasPendingTransaction.remove();
span.end();
}
}
private T runInternal(final TransactionCallable txCallable) {
final AtomicInteger attempt = new AtomicInteger();
Callable retryCallable =
() -> {
boolean useInlinedBegin = true;
if (attempt.get() > 0) {
// Do not inline the BeginTransaction during a retry if the initial attempt did not
// actually start a transaction.
useInlinedBegin = txn.transactionId != null;
txn = session.newTransaction(options);
}
checkState(
isValid, "TransactionRunner has been invalidated by a new operation on the session");
attempt.incrementAndGet();
span.addAnnotation("Starting Transaction Attempt", "Attempt", attempt.longValue());
// Only ensure that there is a transaction if we should not inline the beginTransaction
// with the first statement.
if (!useInlinedBegin) {
txn.ensureTxn();
}
T result;
boolean shouldRollback = true;
try {
result = txCallable.run(txn);
shouldRollback = false;
} catch (Exception e) {
txnLogger.log(Level.FINE, "User-provided TransactionCallable raised exception", e);
if (txn.isAborted() || (e instanceof AbortedException)) {
span.addAnnotation(
"Transaction Attempt Aborted in user operation. Retrying",
"Attempt",
attempt.longValue());
shouldRollback = false;
if (e instanceof AbortedException) {
throw e;
}
throw SpannerExceptionFactory.newSpannerException(
ErrorCode.ABORTED, e.getMessage(), e);
}
SpannerException toThrow;
if (e instanceof SpannerException) {
toThrow = (SpannerException) e;
} else {
toThrow = newSpannerException(ErrorCode.UNKNOWN, e.getMessage(), e);
}
span.addAnnotation(
"Transaction Attempt Failed in user operation",
ImmutableMap.of(
"Attempt", attempt.longValue(), "Status", toThrow.getErrorCode().toString()));
throw toThrow;
} finally {
if (shouldRollback) {
txn.rollback();
}
}
try {
txn.commit();
span.addAnnotation("Transaction Attempt Succeeded", "Attempt", attempt.longValue());
return result;
} catch (AbortedException e) {
txnLogger.log(Level.FINE, "Commit aborted", e);
span.addAnnotation(
"Transaction Attempt Aborted in Commit. Retrying", "Attempt", attempt.longValue());
throw e;
} catch (SpannerException e) {
span.addAnnotation(
"Transaction Attempt Failed in Commit",
ImmutableMap.of(
"Attempt", attempt.longValue(), "Status", e.getErrorCode().toString()));
throw e;
}
};
return SpannerRetryHelper.runTxWithRetriesOnAborted(retryCallable);
}
@Override
public Timestamp getCommitTimestamp() {
checkState(txn != null, "run() has not yet returned normally");
return txn.getCommitResponse().getCommitTimestamp();
}
public CommitResponse getCommitResponse() {
checkState(txn != null, "run() has not yet returned normally");
return txn.getCommitResponse();
}
@Override
public void invalidate() {
isValid = false;
}
}