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// SPDX-License-Identifier: Apache-2.0
// Copyright (c) 2020-2024 MariaDB Corporation Ab
package org.mariadb.r2dbc.client;
import io.netty.buffer.ByteBuf;
import io.netty.util.AbstractReferenceCounted;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.ReferenceCounted;
import io.r2dbc.spi.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.Predicate;
import org.mariadb.r2dbc.ExceptionFactory;
import org.mariadb.r2dbc.MariadbConnectionConfiguration;
import org.mariadb.r2dbc.api.MariadbResult;
import org.mariadb.r2dbc.message.Protocol;
import org.mariadb.r2dbc.message.ServerMessage;
import org.mariadb.r2dbc.message.server.*;
import org.mariadb.r2dbc.util.Assert;
import org.mariadb.r2dbc.util.ServerPrepareResult;
import org.mariadb.r2dbc.util.constants.ServerStatus;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
public final class MariadbSegmentResult extends AbstractReferenceCounted implements MariadbResult {
private final Flux segments;
private MariadbSegmentResult(Flux segments) {
this.segments = segments;
}
MariadbSegmentResult(
Protocol protocol,
AtomicReference prepareResult,
Flux messages,
ExceptionFactory factory,
String[] generatedColumns,
boolean supportReturning,
MariadbConnectionConfiguration conf) {
final List columns = new ArrayList<>();
final AtomicBoolean metaFollows = new AtomicBoolean(true);
final AtomicReference rowConstructor =
new AtomicReference<>();
final AtomicReference meta = new AtomicReference<>();
final AtomicBoolean isOutputParameter = new AtomicBoolean();
this.segments =
messages.handle(
(message, sink) -> {
if (message instanceof CompletePrepareResult) {
prepareResult.set(((CompletePrepareResult) message).getPrepare());
return;
}
if (message instanceof ColumnCountPacket) {
metaFollows.set(((ColumnCountPacket) message).isMetaFollows());
if (!metaFollows.get()) {
columns.addAll(Arrays.asList(prepareResult.get().getColumns()));
}
return;
}
if (message instanceof ColumnDefinitionPacket) {
columns.add((ColumnDefinitionPacket) message);
return;
}
if (message instanceof EofPacket) {
EofPacket eof = (EofPacket) message;
if (!eof.ending()) {
rowConstructor.set(
protocol == Protocol.TEXT ? MariadbRowText::new : MariadbRowBinary::new);
ColumnDefinitionPacket[] columnsArray =
columns.toArray(new ColumnDefinitionPacket[0]);
meta.set(new MariadbRowMetadata(columnsArray));
// in case metadata follows and prepared statement, update meta
if (prepareResult != null && prepareResult.get() != null && metaFollows.get()) {
prepareResult.get().setColumns(columnsArray);
}
isOutputParameter.set(
(eof.getServerStatus() & ServerStatus.PS_OUT_PARAMETERS) > 0);
}
return;
}
if (message instanceof ErrorPacket) {
sink.next(new MariadbErrorSegment((ErrorPacket) message, factory));
return;
}
if (message instanceof OkPacket) {
if (generatedColumns != null && !supportReturning) {
String colName = generatedColumns.length > 0 ? generatedColumns[0] : "ID";
MariadbRowMetadata tmpMeta =
new MariadbRowMetadata(
new ColumnDefinitionPacket[] {
ColumnDefinitionPacket.fromGeneratedId(colName, conf)
});
if (((OkPacket) message).value() > 1) {
sink.error(
factory.createException(
"Connector cannot get generated ID (using returnGeneratedValues)"
+ " multiple rows before MariaDB 10.5.1",
"HY000",
-1));
return;
}
ByteBuf buf =
org.mariadb.r2dbc.client.MariadbResult.getLongTextEncoded(
((OkPacket) message).getLastInsertId());
org.mariadb.r2dbc.api.MariadbRow row = new MariadbRowText(buf, tmpMeta, factory);
sink.next(new MariadbRowSegment(row, buf));
}
Long rowCount = ((OkPacket) message).value();
if (rowCount != null) {
sink.next(new MariadbUpdateCountSegment(rowCount));
}
return;
}
if (message instanceof RowPacket) {
RowPacket row = ((RowPacket) message);
if (isOutputParameter.get()) {
org.mariadb.r2dbc.api.MariadbOutParameters outParameters =
new MariadbOutParameters(
row.getRaw(), new MariadbOutParametersMetadata(columns), factory);
sink.next(new MariadbOutSegment(outParameters, (RowPacket) message));
} else {
org.mariadb.r2dbc.api.MariadbRow rowSegment =
rowConstructor.get().create(row.getRaw(), meta.get(), factory);
sink.next(new MariadbRowSegment(rowSegment, (RowPacket) message));
}
}
});
}
static MariadbSegmentResult toResult(
Protocol protocol,
AtomicReference prepareResult,
Flux messages,
ExceptionFactory factory,
String[] generatedColumns,
boolean supportReturning,
MariadbConnectionConfiguration conf) {
return new MariadbSegmentResult(
protocol, prepareResult, messages, factory, generatedColumns, supportReturning, conf);
}
@Override
public Mono getRowsUpdated() {
return this.segments
.handle(
(segment, sink) -> {
try {
if (segment instanceof MariadbErrorSegment) {
sink.error(((MariadbErrorSegment) segment).exception());
return;
}
if (segment instanceof Result.UpdateCount) {
sink.next((int) (((Result.UpdateCount) segment).value()));
}
} finally {
ReferenceCountUtil.release(segment);
}
})
.collectList()
.handle(
(list, sink) -> {
if (list.isEmpty()) {
return;
}
int sum = 0;
for (Integer integer : list) {
sum += integer;
}
sink.next(sum);
});
}
@Override
public Flux map(BiFunction f) {
Assert.requireNonNull(f, "f must not be null");
return this.segments.handle(
(segment, sink) -> {
try {
if (segment instanceof MariadbErrorSegment) {
sink.error(((MariadbErrorSegment) segment).exception());
return;
}
if (segment instanceof Result.RowSegment) {
Result.RowSegment row = (Result.RowSegment) segment;
sink.next(f.apply(row.row(), row.row().getMetadata()));
}
} finally {
ReferenceCountUtil.release(segment);
}
});
}
@Override
public MariadbSegmentResult filter(Predicate filter) {
Assert.requireNonNull(filter, "filter must not be null");
return new MariadbSegmentResult(
this.segments.filter(
it -> {
boolean result = filter.test(it);
if (!result) {
ReferenceCountUtil.release(it);
}
return result;
}));
}
@Override
@SuppressWarnings("unchecked")
public Publisher flatMap(
Function> mappingFunction) {
Assert.requireNonNull(mappingFunction, "mappingFunction must not be null");
return this.segments.concatMap(
segment -> {
Publisher result = mappingFunction.apply(segment);
if (result == null) {
return Mono.error(new IllegalStateException("The mapper returned a null Publisher"));
}
if (result instanceof Mono) {
return ((Mono) result).doFinally(s -> ReferenceCountUtil.release(segment));
}
return Flux.from(result).doFinally(s -> ReferenceCountUtil.release(segment));
});
}
@Override
protected void deallocate() {
this.getRowsUpdated().subscribe();
}
@Override
public ReferenceCounted touch(Object hint) {
return this;
}
@Override
public String toString() {
return "MariadbSegmentResult{segments=" + this.segments + '}';
}
static class MariadbRowSegment extends AbstractReferenceCounted implements Result.RowSegment {
private final Row row;
private final ReferenceCounted releaseable;
public MariadbRowSegment(Row row, ReferenceCounted releaseable) {
this.row = row;
this.releaseable = releaseable;
}
@Override
public Row row() {
return this.row;
}
@Override
protected void deallocate() {
ReferenceCountUtil.release(this.releaseable);
}
@Override
public ReferenceCounted touch(Object hint) {
return this;
}
}
static class MariadbOutSegment extends AbstractReferenceCounted implements Result.OutSegment {
private final OutParameters outParameters;
private final ReferenceCounted releaseable;
public MariadbOutSegment(OutParameters outParameters, ReferenceCounted releaseable) {
this.outParameters = outParameters;
this.releaseable = releaseable;
}
@Override
public OutParameters outParameters() {
return outParameters;
}
@Override
protected void deallocate() {
ReferenceCountUtil.release(this.releaseable);
}
@Override
public ReferenceCounted touch(Object hint) {
return this;
}
}
static class MariadbUpdateCountSegment implements Result.UpdateCount {
private final long value;
public MariadbUpdateCountSegment(long value) {
this.value = value;
}
@Override
public long value() {
return this.value;
}
}
static class MariadbErrorSegment implements Result.Message {
private final ExceptionFactory factory;
private final ErrorPacket error;
public MariadbErrorSegment(ErrorPacket error, ExceptionFactory factory) {
this.factory = factory;
this.error = error;
}
@Override
public R2dbcException exception() {
return this.factory.from(error);
}
@Override
public int errorCode() {
return error.errorCode();
}
@Override
public String sqlState() {
return error.sqlState();
}
@Override
public String message() {
return error.getMessage();
}
}
}
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