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This module contains the SQL Client for exploring and
submitting SQL programs to Flink.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.flink.table.client.cli;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.table.client.gateway.ResultDescriptor;
import org.apache.flink.table.client.gateway.SqlExecutionException;
import org.apache.flink.table.client.gateway.TypedResult;
import org.apache.flink.types.Row;
import org.jline.keymap.KeyMap;
import org.jline.utils.AttributedString;
import org.jline.utils.AttributedStringBuilder;
import org.jline.utils.AttributedStyle;
import org.jline.utils.InfoCmp.Capability;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import static org.apache.flink.table.client.cli.CliUtils.TIME_FORMATTER;
import static org.apache.flink.table.client.cli.CliUtils.formatTwoLineHelpOptions;
import static org.apache.flink.table.client.cli.CliUtils.normalizeColumn;
import static org.apache.flink.table.client.cli.CliUtils.repeatChar;
import static org.jline.keymap.KeyMap.ctrl;
import static org.jline.keymap.KeyMap.esc;
import static org.jline.keymap.KeyMap.key;
/**
* CLI view for retrieving and displaying a table.
*/
public class CliTableResultView extends CliResultView {
private int pageCount;
private int page;
private LocalTime lastRetrieval;
private int previousResultsPage;
private static final int DEFAULT_REFRESH_INTERVAL = 3; // every 1s
private static final int MIN_REFRESH_INTERVAL = 1; // every 100ms
private static final int LAST_PAGE = 0;
public CliTableResultView(CliClient client, ResultDescriptor resultDescriptor) {
super(client, resultDescriptor);
refreshInterval = DEFAULT_REFRESH_INTERVAL;
pageCount = 1;
page = LAST_PAGE;
previousResults = Collections.emptyList();
previousResultsPage = 1;
results = Collections.emptyList();
}
// --------------------------------------------------------------------------------------------
@Override
protected String[] getRow(String[] resultRow) {
return resultRow;
}
@Override
protected int computeColumnWidth(int idx) {
return MAX_COLUMN_WIDTH;
}
@Override
protected void refresh() {
// take snapshot
TypedResult result;
try {
result = client.getExecutor().snapshotResult(client.getContext(), resultDescriptor.getResultId(), getVisibleMainHeight());
} catch (SqlExecutionException e) {
close(e);
return;
}
// stop retrieval if job is done
if (result.getType() == TypedResult.ResultType.EOS) {
stopRetrieval();
}
// update page
else if (result.getType() == TypedResult.ResultType.PAYLOAD) {
int newPageCount = result.getPayload();
pageCount = newPageCount;
if (page > newPageCount) {
page = LAST_PAGE;
}
updatePage();
}
lastRetrieval = LocalTime.now();
// reset view
resetAllParts();
}
@Override
protected KeyMap getKeys() {
final KeyMap keys = new KeyMap<>();
keys.setAmbiguousTimeout(200); // make ESC quicker
keys.bind(ResultTableOperation.QUIT, "q", "Q", esc(), ctrl('c'));
keys.bind(ResultTableOperation.REFRESH, "r", "R", key(client.getTerminal(), Capability.key_f5));
keys.bind(ResultTableOperation.UP, "w", "W", key(client.getTerminal(), Capability.key_up));
keys.bind(ResultTableOperation.DOWN, "s", "S", key(client.getTerminal(), Capability.key_down));
keys.bind(ResultTableOperation.LEFT, "a", "A", key(client.getTerminal(), Capability.key_left));
keys.bind(ResultTableOperation.RIGHT, "d", "D", key(client.getTerminal(), Capability.key_right));
keys.bind(ResultTableOperation.OPEN, "o", "O", "\r");
keys.bind(ResultTableOperation.GOTO, "g", "G");
keys.bind(ResultTableOperation.NEXT, "n", "N");
keys.bind(ResultTableOperation.PREV, "p", "P");
keys.bind(ResultTableOperation.LAST, "l", "L", key(client.getTerminal(), Capability.key_end));
keys.bind(ResultTableOperation.INC_REFRESH, "+");
keys.bind(ResultTableOperation.DEC_REFRESH, "-");
return keys;
}
@Override
protected void evaluate(ResultTableOperation operation, String binding) {
switch (operation) {
case QUIT:
close();
break;
case REFRESH:
refresh();
break;
case UP:
selectRowUp();
break;
case DOWN:
selectRowDown();
break;
case OPEN:
openRow();
break;
case GOTO:
gotoPage();
break;
case NEXT:
gotoNextPage();
break;
case PREV:
gotoPreviousPage();
break;
case LAST:
gotoLastPage();
break;
case LEFT:
scrollLeft();
break;
case RIGHT:
scrollRight();
break;
case INC_REFRESH:
increaseRefreshInterval();
break;
case DEC_REFRESH:
decreaseRefreshInterval(MIN_REFRESH_INTERVAL);
break;
}
}
@Override
protected String getTitle() {
return CliStrings.RESULT_TITLE + " (" + CliStrings.RESULT_TABLE + ")";
}
@Override
protected List computeHeaderLines() {
final AttributedStringBuilder statusLine = new AttributedStringBuilder();
statusLine.style(AttributedStyle.INVERSE);
// left
final String left;
if (isRetrieving()) {
left = CliStrings.DEFAULT_MARGIN + CliStrings.RESULT_REFRESH_INTERVAL + ' ' + REFRESH_INTERVALS.get(refreshInterval).f0;
} else {
left = CliStrings.DEFAULT_MARGIN + CliStrings.RESULT_STOPPED;
}
// middle
final StringBuilder middleBuilder = new StringBuilder();
middleBuilder.append(CliStrings.RESULT_PAGE);
middleBuilder.append(' ');
if (page == LAST_PAGE) {
middleBuilder.append(CliStrings.RESULT_LAST_PAGE);
} else {
middleBuilder.append(page);
}
middleBuilder.append(CliStrings.RESULT_PAGE_OF);
middleBuilder.append(pageCount);
final String middle = middleBuilder.toString();
// right
final String right;
if (lastRetrieval == null) {
right = CliStrings.RESULT_LAST_REFRESH + ' ' + CliStrings.RESULT_REFRESH_UNKNOWN + CliStrings.DEFAULT_MARGIN;
} else {
right = CliStrings.RESULT_LAST_REFRESH + ' ' + lastRetrieval.format(TIME_FORMATTER) + CliStrings.DEFAULT_MARGIN;
}
// all together
final int totalLeftSpace = getWidth() - middle.length();
final int leftSpace = totalLeftSpace / 2 - left.length();
statusLine.append(left);
repeatChar(statusLine, ' ', leftSpace);
statusLine.append(middle);
final int rightSpacing = getWidth() - statusLine.length() - right.length();
repeatChar(statusLine, ' ', rightSpacing);
statusLine.append(right);
return Arrays.asList(statusLine.toAttributedString(), AttributedString.EMPTY);
}
@Override
protected List computeMainHeaderLines() {
final AttributedStringBuilder schemaHeader = new AttributedStringBuilder();
Arrays.stream(resultDescriptor.getResultSchema().getColumnNames()).forEach(s -> {
schemaHeader.append(' ');
schemaHeader.style(AttributedStyle.DEFAULT.underline());
normalizeColumn(schemaHeader, s, MAX_COLUMN_WIDTH);
schemaHeader.style(AttributedStyle.DEFAULT);
});
return Collections.singletonList(schemaHeader.toAttributedString());
}
@Override
protected List computeFooterLines() {
return formatTwoLineHelpOptions(getWidth(), getHelpOptions());
}
// --------------------------------------------------------------------------------------------
private void updatePage() {
// retrieve page
final int retrievalPage = page == LAST_PAGE ? pageCount : page;
final List rows;
try {
rows = client.getExecutor().retrieveResultPage(resultDescriptor.getResultId(), retrievalPage);
} catch (SqlExecutionException e) {
close(e);
return;
}
// convert page
final List stringRows = rows
.stream()
.map(CliUtils::rowToString)
.collect(Collectors.toList());
// update results
if (previousResultsPage == retrievalPage) {
// only use the previous results if the current page number has not changed
// this allows for updated results when the key space remains constant
previousResults = results;
} else {
previousResults = null;
previousResultsPage = retrievalPage;
}
results = stringRows;
// check if selected row is still valid
if (selectedRow != NO_ROW_SELECTED) {
if (selectedRow >= results.size()) {
selectedRow = NO_ROW_SELECTED;
}
}
// reset view
resetAllParts();
}
private List> getHelpOptions() {
final List> options = new ArrayList<>();
options.add(Tuple2.of("Q", CliStrings.RESULT_QUIT));
options.add(Tuple2.of("R", CliStrings.RESULT_REFRESH));
options.add(Tuple2.of("+", CliStrings.RESULT_INC_REFRESH));
options.add(Tuple2.of("-", CliStrings.RESULT_DEC_REFRESH));
options.add(Tuple2.of("G", CliStrings.RESULT_GOTO));
options.add(Tuple2.of("L", CliStrings.RESULT_LAST));
options.add(Tuple2.of("N", CliStrings.RESULT_NEXT));
options.add(Tuple2.of("P", CliStrings.RESULT_PREV));
options.add(Tuple2.of("O", CliStrings.RESULT_OPEN));
return options;
}
private void gotoPage() {
final CliInputView view = new CliInputView(
client,
CliStrings.INPUT_ENTER_PAGE + " [1 to " + pageCount + "]",
(s) -> {
// validate input
final int newPage;
try {
newPage = Integer.parseInt(s);
} catch (NumberFormatException e) {
return false;
}
return newPage > 0 && newPage <= pageCount;
});
view.open(); // enter view
if (view.getResult() != null) {
page = Integer.parseInt(view.getResult());
updatePage();
}
}
private void gotoNextPage() {
final int curPageIndex = page == LAST_PAGE ? pageCount : page;
if (curPageIndex < pageCount) {
page = curPageIndex + 1;
}
updatePage();
}
private void gotoPreviousPage() {
final int curPageIndex = page == LAST_PAGE ? pageCount : page;
if (curPageIndex > 1) {
page = curPageIndex - 1;
}
updatePage();
}
private void gotoLastPage() {
page = LAST_PAGE;
updatePage();
}
// --------------------------------------------------------------------------------------------
/**
* Available operations for this view.
*/
public enum ResultTableOperation {
QUIT, // leave view
REFRESH, // refresh current table page
UP, // row selection up
DOWN, // row selection down
OPEN, // shows a full row
GOTO, // enter table page number
NEXT, // next table page
PREV, // previous table page
LAST, // last table page
LEFT, // scroll left if row is large
RIGHT, // scroll right if row is large
INC_REFRESH, // increase refresh rate
DEC_REFRESH, // decrease refresh rate
}
}