/*
* Copyright 2015-2017 the original author or authors.
*
* 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 org.glowroot.ui;
import java.io.File;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.List;
import com.google.common.collect.EvictingQueue;
import com.google.common.collect.Lists;
import com.google.common.collect.Ordering;
import com.google.common.io.Files;
import com.google.common.io.LineProcessor;
import com.google.common.net.MediaType;
import com.google.common.primitives.Longs;
import io.netty.handler.codec.http.HttpHeaderNames;
import org.glowroot.ui.CommonHandler.CommonRequest;
import org.glowroot.ui.CommonHandler.CommonResponse;
import org.glowroot.ui.HttpSessionManager.Authentication;
import static io.netty.handler.codec.http.HttpResponseStatus.FOUND;
import static io.netty.handler.codec.http.HttpResponseStatus.OK;
class GlowrootLogHttpService implements HttpService {
private static final int DEFAULT_MAX_LINES = 1000;
private static final Ordering<File> byLastModified = new Ordering<File>() {
@Override
public int compare(File left, File right) {
return Longs.compare(left.lastModified(), right.lastModified());
}
};
private final File logDir;
GlowrootLogHttpService(File logDir) {
this.logDir = logDir;
}
@Override
public String getPermission() {
return "admin:view:log";
}
@Override
public CommonResponse handleRequest(CommonRequest request, Authentication authentication)
throws Exception {
List<String> maxLinesParams = request.getParameters("max-lines");
if (maxLinesParams.isEmpty()) {
CommonResponse response = new CommonResponse(FOUND);
response.setHeader(HttpHeaderNames.LOCATION, "log?max-lines=" + DEFAULT_MAX_LINES);
return response;
}
int maxLines = Integer.parseInt(maxLinesParams.get(0));
File[] list = logDir.listFiles();
if (list == null) {
throw new IllegalStateException(
"Could not list directory: " + logDir.getAbsolutePath());
}
List<File> files = Lists.newArrayList();
for (File file : list) {
if (file.isFile() && file.getName().matches("glowroot.*\\.log")) {
files.add(file);
}
}
files = byLastModified.reverse().sortedCopy(files);
List<String> lines = Lists.newArrayList();
for (File file : files) {
// don't read entire file into memory at once, even though rollover may be 10mb, a flood
// of logging can create a much much much larger file before rollover occurs
// (see ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy call to isTooSoon())
// logback writes logs in default charset
// "+ 1" is to read extra line to know whether to add "[earlier log entries truncated]"
Collection<String> olderLines = Files.readLines(file, Charset.defaultCharset(),
new ReadLastNLines(maxLines + 1 - lines.size()));
lines.addAll(0, olderLines);
if (lines.size() > maxLines) {
break;
}
}
List<ChunkSource> chunkSources = Lists.newArrayList();
if (lines.size() > maxLines) {
// return last 'maxLines' lines from aggregated log files
lines = lines.subList(lines.size() - maxLines, lines.size());
chunkSources.add(ChunkSource.wrap("[earlier log entries truncated]\n\n"));
}
for (String line : lines) {
chunkSources.add(ChunkSource.wrap(line + '\n'));
}
return new CommonResponse(OK, MediaType.PLAIN_TEXT_UTF_8, ChunkSource.concat(chunkSources));
}
private static class ReadLastNLines implements LineProcessor<Collection<String>> {
private final Collection<String> queue;
private ReadLastNLines(int nLines) {
queue = EvictingQueue.create(nLines);
}
@Override
public boolean processLine(String line) {
queue.add(line);
return true;
}
@Override
public Collection<String> getResult() {
return queue;
}
}
}