// Copyright (C) 2014 The Android Open Source Project
//
// 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.gerrit.server.query.change;
import static com.google.common.base.Preconditions.checkState;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.gerrit.common.TimeUtil;
import com.google.gerrit.common.data.LabelTypes;
import com.google.gerrit.reviewdb.client.PatchSet;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.config.TrackingFooters;
import com.google.gerrit.server.data.ChangeAttribute;
import com.google.gerrit.server.data.PatchSetAttribute;
import com.google.gerrit.server.data.QueryStatsAttribute;
import com.google.gerrit.server.events.EventFactory;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.project.ChangeControl;
import com.google.gerrit.server.project.SubmitRuleEvaluator;
import com.google.gerrit.server.query.QueryParseException;
import com.google.gerrit.server.query.QueryResult;
import com.google.gson.Gson;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.util.io.DisabledOutputStream;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/** Change query implementation that outputs to a stream in the style of an SSH command. */
public class OutputStreamQuery {
private static final Logger log = LoggerFactory.getLogger(OutputStreamQuery.class);
private static final DateTimeFormatter dtf = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss zzz");
public enum OutputFormat {
TEXT,
JSON
}
private final ReviewDb db;
private final GitRepositoryManager repoManager;
private final ChangeQueryBuilder queryBuilder;
private final ChangeQueryProcessor queryProcessor;
private final EventFactory eventFactory;
private final TrackingFooters trackingFooters;
private final CurrentUser user;
private OutputFormat outputFormat = OutputFormat.TEXT;
private boolean includePatchSets;
private boolean includeCurrentPatchSet;
private boolean includeApprovals;
private boolean includeComments;
private boolean includeFiles;
private boolean includeCommitMessage;
private boolean includeDependencies;
private boolean includeSubmitRecords;
private boolean includeAllReviewers;
private OutputStream outputStream = DisabledOutputStream.INSTANCE;
private PrintWriter out;
@Inject
OutputStreamQuery(
ReviewDb db,
GitRepositoryManager repoManager,
ChangeQueryBuilder queryBuilder,
ChangeQueryProcessor queryProcessor,
EventFactory eventFactory,
TrackingFooters trackingFooters,
CurrentUser user) {
this.db = db;
this.repoManager = repoManager;
this.queryBuilder = queryBuilder;
this.queryProcessor = queryProcessor;
this.eventFactory = eventFactory;
this.trackingFooters = trackingFooters;
this.user = user;
}
void setLimit(int n) {
queryProcessor.setLimit(n);
}
public void setStart(int n) {
queryProcessor.setStart(n);
}
public void setIncludePatchSets(boolean on) {
includePatchSets = on;
}
public boolean getIncludePatchSets() {
return includePatchSets;
}
public void setIncludeCurrentPatchSet(boolean on) {
includeCurrentPatchSet = on;
}
public boolean getIncludeCurrentPatchSet() {
return includeCurrentPatchSet;
}
public void setIncludeApprovals(boolean on) {
includeApprovals = on;
}
public void setIncludeComments(boolean on) {
includeComments = on;
}
public void setIncludeFiles(boolean on) {
includeFiles = on;
}
public boolean getIncludeFiles() {
return includeFiles;
}
public void setIncludeDependencies(boolean on) {
includeDependencies = on;
}
public boolean getIncludeDependencies() {
return includeDependencies;
}
public void setIncludeCommitMessage(boolean on) {
includeCommitMessage = on;
}
public void setIncludeSubmitRecords(boolean on) {
includeSubmitRecords = on;
}
public void setIncludeAllReviewers(boolean on) {
includeAllReviewers = on;
}
public void setOutput(OutputStream out, OutputFormat fmt) {
this.outputStream = out;
this.outputFormat = fmt;
}
public void query(String queryString) throws IOException {
out =
new PrintWriter( //
new BufferedWriter( //
new OutputStreamWriter(outputStream, UTF_8)));
try {
if (queryProcessor.isDisabled()) {
ErrorMessage m = new ErrorMessage();
m.message = "query disabled";
show(m);
return;
}
try {
final QueryStatsAttribute stats = new QueryStatsAttribute();
stats.runTimeMilliseconds = TimeUtil.nowMs();
Map<Project.NameKey, Repository> repos = new HashMap<>();
Map<Project.NameKey, RevWalk> revWalks = new HashMap<>();
QueryResult<ChangeData> results = queryProcessor.query(queryBuilder.parse(queryString));
try {
for (ChangeData d : results.entities()) {
show(buildChangeAttribute(d, repos, revWalks));
}
} finally {
closeAll(revWalks.values(), repos.values());
}
stats.rowCount = results.entities().size();
stats.moreChanges = results.more();
stats.runTimeMilliseconds = TimeUtil.nowMs() - stats.runTimeMilliseconds;
show(stats);
} catch (OrmException err) {
log.error("Cannot execute query: " + queryString, err);
ErrorMessage m = new ErrorMessage();
m.message = "cannot query database";
show(m);
} catch (QueryParseException e) {
ErrorMessage m = new ErrorMessage();
m.message = e.getMessage();
show(m);
}
} finally {
try {
out.flush();
} finally {
out = null;
}
}
}
private ChangeAttribute buildChangeAttribute(
ChangeData d, Map<Project.NameKey, Repository> repos, Map<Project.NameKey, RevWalk> revWalks)
throws OrmException, IOException {
ChangeControl cc = d.changeControl().forUser(user);
LabelTypes labelTypes = cc.getLabelTypes();
ChangeAttribute c = eventFactory.asChangeAttribute(db, d.change());
eventFactory.extend(c, d.change());
if (!trackingFooters.isEmpty()) {
eventFactory.addTrackingIds(c, trackingFooters.extract(d.commitFooters()));
}
if (includeAllReviewers) {
eventFactory.addAllReviewers(db, c, d.notes());
}
if (includeSubmitRecords) {
eventFactory.addSubmitRecords(
c, new SubmitRuleEvaluator(d).setAllowClosed(true).setAllowDraft(true).evaluate());
}
if (includeCommitMessage) {
eventFactory.addCommitMessage(c, d.commitMessage());
}
RevWalk rw = null;
if (includePatchSets || includeCurrentPatchSet || includeDependencies) {
Project.NameKey p = d.change().getProject();
rw = revWalks.get(p);
// Cache and reuse repos and revwalks.
if (rw == null) {
Repository repo = repoManager.openRepository(p);
checkState(repos.put(p, repo) == null);
rw = new RevWalk(repo);
revWalks.put(p, rw);
}
}
if (includePatchSets) {
eventFactory.addPatchSets(
db,
rw,
c,
d.visiblePatchSets(),
includeApprovals ? d.approvals().asMap() : null,
includeFiles,
d.change(),
labelTypes);
}
if (includeCurrentPatchSet) {
PatchSet current = d.currentPatchSet();
if (current != null && cc.isPatchVisible(current, d.db())) {
c.currentPatchSet = eventFactory.asPatchSetAttribute(db, rw, d.change(), current);
eventFactory.addApprovals(c.currentPatchSet, d.currentApprovals(), labelTypes);
if (includeFiles) {
eventFactory.addPatchSetFileNames(c.currentPatchSet, d.change(), d.currentPatchSet());
}
if (includeComments) {
eventFactory.addPatchSetComments(c.currentPatchSet, d.publishedComments());
}
}
}
if (includeComments) {
eventFactory.addComments(c, d.messages());
if (includePatchSets) {
eventFactory.addPatchSets(
db,
rw,
c,
d.visiblePatchSets(),
includeApprovals ? d.approvals().asMap() : null,
includeFiles,
d.change(),
labelTypes);
for (PatchSetAttribute attribute : c.patchSets) {
eventFactory.addPatchSetComments(attribute, d.publishedComments());
}
}
}
if (includeDependencies) {
eventFactory.addDependencies(rw, c, d.change(), d.currentPatchSet());
}
c.plugins = queryProcessor.create(d);
return c;
}
private static void closeAll(Iterable<RevWalk> revWalks, Iterable<Repository> repos) {
if (repos != null) {
for (Repository repo : repos) {
repo.close();
}
}
if (revWalks != null) {
for (RevWalk revWalk : revWalks) {
revWalk.close();
}
}
}
private void show(Object data) {
switch (outputFormat) {
default:
case TEXT:
if (data instanceof ChangeAttribute) {
out.print("change ");
out.print(((ChangeAttribute) data).id);
out.print("\n");
showText(data, 1);
} else {
showText(data, 0);
}
out.print('\n');
break;
case JSON:
out.print(new Gson().toJson(data));
out.print('\n');
break;
}
}
private void showText(Object data, int depth) {
for (Field f : fieldsOf(data.getClass())) {
Object val;
try {
val = f.get(data);
} catch (IllegalArgumentException err) {
continue;
} catch (IllegalAccessException err) {
continue;
}
if (val == null) {
continue;
}
showField(f.getName(), val, depth);
}
}
private String indent(int spaces) {
if (spaces == 0) {
return "";
}
return String.format("%" + spaces + "s", " ");
}
private void showField(String field, Object value, int depth) {
final int spacesDepthRatio = 2;
String indent = indent(depth * spacesDepthRatio);
out.print(indent);
out.print(field);
out.print(':');
if (value instanceof String && ((String) value).contains("\n")) {
out.print(' ');
// Idention for multi-line text is
// current depth indetion + length of field + length of ": "
indent = indent(indent.length() + field.length() + spacesDepthRatio);
out.print(((String) value).replaceAll("\n", "\n" + indent).trim());
out.print('\n');
} else if (value instanceof Long && isDateField(field)) {
out.print(' ');
out.print(dtf.print(((Long) value) * 1000L));
out.print('\n');
} else if (isPrimitive(value)) {
out.print(' ');
out.print(value);
out.print('\n');
} else if (value instanceof Collection) {
out.print('\n');
boolean firstElement = true;
for (Object thing : ((Collection<?>) value)) {
// The name of the collection was initially printed at the beginning
// of this routine. Beginning at the second sub-element, reprint
// the collection name so humans can separate individual elements
// with less strain and error.
//
if (firstElement) {
firstElement = false;
} else {
out.print(indent);
out.print(field);
out.print(":\n");
}
if (isPrimitive(thing)) {
out.print(' ');
out.print(value);
out.print('\n');
} else {
showText(thing, depth + 1);
}
}
} else {
out.print('\n');
showText(value, depth + 1);
}
}
private static boolean isPrimitive(Object value) {
return value instanceof String //
|| value instanceof Number //
|| value instanceof Boolean //
|| value instanceof Enum;
}
private static boolean isDateField(String name) {
return "lastUpdated".equals(name) //
|| "grantedOn".equals(name) //
|| "timestamp".equals(name) //
|| "createdOn".equals(name);
}
private List<Field> fieldsOf(Class<?> type) {
List<Field> r = new ArrayList<>();
if (type.getSuperclass() != null) {
r.addAll(fieldsOf(type.getSuperclass()));
}
r.addAll(Arrays.asList(type.getDeclaredFields()));
return r;
}
static class ErrorMessage {
public final String type = "error";
public String message;
}
}