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The reactive Postgres client
/*
* Copyright (C) 2017 Julien Viet
*
* 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.reactiverse.pgclient.impl.codec.decoder;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.CompositeByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.reactiverse.pgclient.impl.CommandBase;
import io.reactiverse.pgclient.impl.CommandResponse;
import io.reactiverse.pgclient.impl.QueryCommandBase;
import io.reactiverse.pgclient.impl.codec.ColumnDesc;
import io.reactiverse.pgclient.impl.codec.DataFormat;
import io.reactiverse.pgclient.impl.codec.DataType;
import io.reactiverse.pgclient.impl.codec.TxStatus;
import io.reactiverse.pgclient.impl.codec.util.Util;
import io.netty.buffer.ByteBuf;
import io.netty.util.ByteProcessor;
import io.reactiverse.pgclient.impl.codec.decoder.type.AuthenticationType;
import io.reactiverse.pgclient.impl.codec.decoder.type.ErrorOrNoticeType;
import io.reactiverse.pgclient.impl.codec.decoder.type.MessageType;
import io.vertx.core.Handler;
import java.util.Deque;
/**
*
* Decoder for PostgreSQL protocol
*
* @author Emad Alblueshi
*/
public class MessageDecoder extends ChannelInboundHandlerAdapter {
private final Deque> inflight;
private final ByteBufAllocator alloc;
private Handler> commandResponseHandler;
private Handler noticeHandler;
private ByteBuf in;
public MessageDecoder(Deque> inflight, ByteBufAllocator alloc) {
this.inflight = inflight;
this.alloc = alloc;
}
public void run(CommandBase cmd) {
cmd.completionHandler = commandResponseHandler;
cmd.noticeHandler = noticeHandler;
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
commandResponseHandler = ctx::fireChannelRead;
noticeHandler = ctx::fireChannelRead;
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
ByteBuf buff = (ByteBuf) msg;
if (in == null) {
in = buff;
} else {
CompositeByteBuf composite;
if (in instanceof CompositeByteBuf) {
composite = (CompositeByteBuf) in;
} else {
composite = alloc.compositeBuffer();
composite.addComponent(true, in);
in = composite;
}
composite.addComponent(true, buff);
}
while (true) {
int available = in.readableBytes();
if (available < 5) {
break;
}
int beginIdx = in.readerIndex();
int length = in.getInt(beginIdx + 1);
if (length + 1 > available) {
break;
}
byte id = in.getByte(beginIdx);
int endIdx = beginIdx + length + 1;
final int writerIndex = in.writerIndex();
try {
in.setIndex(beginIdx + 5, endIdx);
switch (id) {
case MessageType.READY_FOR_QUERY: {
decodeReadyForQuery(in);
break;
}
case MessageType.DATA_ROW: {
decodeDataRow(in);
break;
}
case MessageType.COMMAND_COMPLETE: {
decodeCommandComplete(in);
break;
}
case MessageType.BIND_COMPLETE: {
decodeBindComplete();
break;
}
default: {
decodeMessage(ctx, id, in);
}
}
} finally {
in.setIndex(endIdx, writerIndex);
}
}
if (in != null && !in.isReadable()) {
in.release();
in = null;
}
}
private void decodeMessage(ChannelHandlerContext ctx, byte id, ByteBuf in) {
switch (id) {
case MessageType.ROW_DESCRIPTION: {
decodeRowDescription(in);
break;
}
case MessageType.ERROR_RESPONSE: {
decodeError(in);
break;
}
case MessageType.NOTICE_RESPONSE: {
decodeNotice(in);
break;
}
case MessageType.AUTHENTICATION: {
decodeAuthentication(in);
break;
}
case MessageType.EMPTY_QUERY_RESPONSE: {
decodeEmptyQueryResponse();
break;
}
case MessageType.PARSE_COMPLETE: {
decodeParseComplete();
break;
}
case MessageType.CLOSE_COMPLETE: {
decodeCloseComplete();
break;
}
case MessageType.NO_DATA: {
decodeNoData();
break;
}
case MessageType.PORTAL_SUSPENDED: {
decodePortalSuspended();
break;
}
case MessageType.PARAMETER_DESCRIPTION: {
decodeParameterDescription(in);
break;
}
case MessageType.PARAMETER_STATUS: {
decodeParameterStatus(in);
break;
}
case MessageType.BACKEND_KEY_DATA: {
decodeBackendKeyData(in);
break;
}
case MessageType.NOTIFICATION_RESPONSE: {
decodeNotificationResponse(ctx, in);
break;
}
default: {
throw new UnsupportedOperationException();
}
}
}
private void decodePortalSuspended() {
inflight.peek().handlePortalSuspended();
}
private void decodeCommandComplete(ByteBuf in) {
int updated = processor.parse(in);
inflight.peek().handleCommandComplete(updated);
}
private void decodeDataRow(ByteBuf in) {
QueryCommandBase cmd = (QueryCommandBase) inflight.peek();
int len = in.readUnsignedShort();
cmd.decoder.decodeRow(len, in);
}
private void decodeRowDescription(ByteBuf in) {
ColumnDesc[] columns = new ColumnDesc[in.readUnsignedShort()];
for (int c = 0; c < columns.length; ++c) {
String fieldName = Util.readCStringUTF8(in);
int tableOID = in.readInt();
short columnAttributeNumber = in.readShort();
int typeOID = in.readInt();
short typeSize = in.readShort();
int typeModifier = in.readInt();
int textOrBinary = in.readUnsignedShort(); // Useless for now
ColumnDesc column = new ColumnDesc(
fieldName,
tableOID,
columnAttributeNumber,
DataType.valueOf(typeOID),
typeSize,
typeModifier,
DataFormat.valueOf(textOrBinary)
);
columns[c] = column;
}
RowDescription rowDesc = new RowDescription(columns);
inflight.peek().handleRowDescription(rowDesc);
}
private static final byte I = (byte) 'I', T = (byte) 'T';
private void decodeReadyForQuery(ByteBuf in) {
byte id = in.readByte();
TxStatus txStatus;
if (id == I) {
txStatus = TxStatus.IDLE;
} else if (id == T) {
txStatus = TxStatus.ACTIVE;
} else {
txStatus = TxStatus.FAILED;
}
inflight.peek().handleReadyForQuery(txStatus);
}
private void decodeError(ByteBuf in) {
ErrorResponse response = new ErrorResponse();
decodeErrorOrNotice(response, in);
inflight.peek().handleErrorResponse(response);
}
private void decodeNotice(ByteBuf in) {
NoticeResponse response = new NoticeResponse();
decodeErrorOrNotice(response, in);
inflight.peek().handleNoticeResponse(response);
}
private void decodeErrorOrNotice(Response response, ByteBuf in) {
byte type;
while ((type = in.readByte()) != 0) {
switch (type) {
case ErrorOrNoticeType.SEVERITY:
response.setSeverity(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.CODE:
response.setCode(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.MESSAGE:
response.setMessage(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.DETAIL:
response.setDetail(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.HINT:
response.setHint(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.INTERNAL_POSITION:
response.setInternalPosition(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.INTERNAL_QUERY:
response.setInternalQuery(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.POSITION:
response.setPosition(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.WHERE:
response.setWhere(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.FILE:
response.setFile(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.LINE:
response.setLine(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.ROUTINE:
response.setRoutine(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.SCHEMA:
response.setSchema(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.TABLE:
response.setTable(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.COLUMN:
response.setColumn(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.DATA_TYPE:
response.setDataType(Util.readCStringUTF8(in));
break;
case ErrorOrNoticeType.CONSTRAINT:
response.setConstraint(Util.readCStringUTF8(in));
break;
default:
Util.readCStringUTF8(in);
break;
}
}
}
private void decodeAuthentication(ByteBuf in) {
int type = in.readInt();
switch (type) {
case AuthenticationType.OK: {
inflight.peek().handleAuthenticationOk();
}
break;
case AuthenticationType.MD5_PASSWORD: {
byte[] salt = new byte[4];
in.readBytes(salt);
inflight.peek().handleAuthenticationMD5Password(salt);
}
break;
case AuthenticationType.CLEARTEXT_PASSWORD: {
inflight.peek().handleAuthenticationClearTextPassword();
}
break;
case AuthenticationType.KERBEROS_V5:
case AuthenticationType.SCM_CREDENTIAL:
case AuthenticationType.GSS:
case AuthenticationType.GSS_CONTINUE:
case AuthenticationType.SSPI:
default:
throw new UnsupportedOperationException("Authentication type " + type + " is not supported in the client");
}
}
private CommandCompleteProcessor processor = new CommandCompleteProcessor();
static class CommandCompleteProcessor implements ByteProcessor {
private static final byte SPACE = 32;
private int rows;
boolean afterSpace;
int parse(ByteBuf in) {
afterSpace = false;
rows = 0;
in.forEachByte(in.readerIndex(), in.readableBytes() - 1, this);
return rows;
}
@Override
public boolean process(byte value) throws Exception {
boolean space = value == SPACE;
if (afterSpace) {
if (space) {
rows = 0;
} else {
rows = rows * 10 + (value - '0');
}
} else {
afterSpace = space;
}
return true;
}
}
private void decodeParseComplete() {
inflight.peek().handleParseComplete();
}
private void decodeBindComplete() {
inflight.peek().handleBindComplete();
}
private void decodeCloseComplete() {
inflight.peek().handleCloseComplete();
}
private void decodeNoData() {
inflight.peek().handleNoData();
}
private void decodeParameterDescription(ByteBuf in) {
DataType[] paramDataTypes = new DataType[in.readUnsignedShort()];
for (int c = 0; c < paramDataTypes.length; ++c) {
paramDataTypes[c] = DataType.valueOf(in.readInt());
}
inflight.peek().handleParameterDescription(new ParameterDescription(paramDataTypes));
}
private void decodeParameterStatus(ByteBuf in) {
String key = Util.readCStringUTF8(in);
String value = Util.readCStringUTF8(in);
inflight.peek().handleParameterStatus(key, value);
}
private void decodeEmptyQueryResponse() {
inflight.peek().handleEmptyQueryResponse();
}
private void decodeBackendKeyData(ByteBuf in) {
int processId = in.readInt();
int secretKey = in.readInt();
inflight.peek().handleBackendKeyData(processId, secretKey);
}
private void decodeNotificationResponse(ChannelHandlerContext ctx, ByteBuf in) {
ctx.fireChannelRead(new NotificationResponse(in.readInt(), Util.readCStringUTF8(in), Util.readCStringUTF8(in)));
}
}