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/*
* Copyright (c) 2024 Contributors to the Eclipse Foundation.
* Copyright (c) 2010, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.admin.rest.resources.custom;
import com.sun.enterprise.server.logging.logviewer.backend.LogFilter;
import jakarta.inject.Inject;
import jakarta.ws.rs.DefaultValue;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.QueryParam;
import jakarta.ws.rs.WebApplicationException;
import jakarta.ws.rs.core.Context;
import jakarta.ws.rs.core.HttpHeaders;
import jakarta.ws.rs.core.MultivaluedMap;
import jakarta.ws.rs.core.Response;
import jakarta.ws.rs.core.Response.ResponseBuilder;
import jakarta.ws.rs.core.StreamingOutput;
import jakarta.ws.rs.core.UriBuilder;
import jakarta.ws.rs.core.UriInfo;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.RandomAccessFile;
import java.io.Writer;
import java.net.URI;
import java.nio.charset.Charset;
import java.util.zip.GZIPOutputStream;
import org.glassfish.admin.rest.adapter.LocatorBridge;
import org.glassfish.admin.rest.logviewer.CharSpool;
import org.glassfish.admin.rest.logviewer.LineEndNormalizingWriter;
import org.glassfish.admin.rest.logviewer.WriterOutputStream;
import org.glassfish.hk2.api.ServiceLocator;
import org.jvnet.hk2.config.Dom;
import static java.nio.charset.StandardCharsets.UTF_8;
/**
* Represents a large text data.
*
*
* This class defines methods for handling progressive text update.
*
* Usage
*
*
* @author Kohsuke Kawaguchi
*/
//@Path("view-log/")
public class LogViewerResource {
@Inject
private ServiceLocator locator;
@Inject
private UriInfo uriInfo;
@Inject
private LocatorBridge locatorBridge;
private Source source;
protected Charset charset;
private volatile boolean completed;
public void setEntity(Dom p) {
// ugly no-op hack. For now.
}
@Path("details/")
public StructuredLogViewerResource getDomainUptimeResource() {
StructuredLogViewerResource resource = locator.createAndInitialize(StructuredLogViewerResource.class);
return resource;
}
@GET
@Produces("text/plain; charset=UTF-8")
public Response get(@QueryParam("start") @DefaultValue("0") long start,
@QueryParam("instanceName") @DefaultValue("server") String instanceName, @Context HttpHeaders hh) throws IOException {
boolean gzipOK = true;
MultivaluedMap headerParams = hh.getRequestHeaders();
String acceptEncoding = headerParams.getFirst("Accept-Encoding");
if (acceptEncoding == null || acceptEncoding.indexOf("gzip") == -1) {
gzipOK = false;
}
// getting logFilter object from habitat
LogFilter logFilter = locatorBridge.getRemoteLocator().getService(LogFilter.class);
String logLocation = "";
// getting log file location on DAS for server/local instance/remote instance
logLocation = logFilter.getLogFileForGivenTarget(instanceName);
initLargeText(new File(logLocation), false);
if (!source.exists()) {
// file doesn't exist yet
UriBuilder uriBuilder = uriInfo.getAbsolutePathBuilder();
uriBuilder.queryParam("start", 0);
uriBuilder.queryParam("instanceName", instanceName);
return Response.ok(new StreamingOutput() {
@Override
public void write(OutputStream out) throws IOException, WebApplicationException {
}
}).header("X-Text-Append-Next", uriBuilder.build()).build();
}
if (source.length() < start) {
start = 0; // text rolled over
}
final CharSpool spool = new CharSpool();
long size = writeLogTo(start, spool);
// response.addHeader("X-Text-Size", String.valueOf(r));
// if (!completed) {
// response.addHeader("X-More-Data", "true");
// }
if (size < 10000) {
gzipOK = false;
}
final boolean gz = gzipOK;
ResponseBuilder rp = Response.ok(new StreamingOutput() {
@Override
public void write(OutputStream out) throws IOException, WebApplicationException {
Writer w = getWriter(out, gz);
spool.writeTo(new LineEndNormalizingWriter(w));
w.flush();
w.close();
}
});
UriBuilder uriBuilder = uriInfo.getAbsolutePathBuilder();
uriBuilder.queryParam("start", size);
uriBuilder.queryParam("instanceName", instanceName);
URI next = uriBuilder.build();
rp.header("X-Text-Append-Next", next);
if (gzipOK) {
rp = rp.header("Content-Encoding", "gzip");
}
return rp.build();
// return rp.header("X-Text-Size", String.valueOf(r)).header("X-More-Data", "true").build();
}
private Writer getWriter(OutputStream out, boolean gzipOK) throws IOException {
if (gzipOK) {
return new OutputStreamWriter(new GZIPOutputStream(out), UTF_8);
}
return new OutputStreamWriter(out, UTF_8);
}
public void initLargeText(File file, boolean completed) {
initLargeText(file, Charset.defaultCharset(), completed);
}
public void initLargeText(final File file, Charset charset, boolean completed) {
this.charset = charset;
this.source = new Source() {
@Override
public Session open() throws IOException {
return new FileSession(file);
}
@Override
public long length() {
return file.length();
}
@Override
public boolean exists() {
return file.exists();
}
};
this.completed = completed;
}
public void markAsComplete() {
completed = true;
}
public boolean isComplete() {
return completed;
}
private long writeLogTo(long start, Writer w) throws IOException {
return writeLogTo(start, new WriterOutputStream(w, charset));
}
/**
* Writes the tail portion of the file to the {@link OutputStream}.
*
* @param start The byte offset in the input file where the write operation starts.
* @return if the file is still being written, this method writes the file until the last newline character and returns
* the offset to start the next write operation.
*/
private long writeLogTo(long start, OutputStream os) throws IOException {
/// CountingOutputStream os = new CountingOutputStream(out);
long count = 0;
Session f = source.open();
f.skip(start);
if (completed) {
// write everything till EOF
byte[] buf = new byte[8192];
int sz;
while ((sz = f.read(buf)) >= 0) {
os.write(buf, 0, sz);
}
count += sz;
} else {
ByteBuf buf = new ByteBuf(null, f);
HeadMark head = new HeadMark(buf);
TailMark tail = new TailMark(buf);
while (tail.moveToNextLine(f)) {
count += head.moveTo(tail, os);
}
count += head.finish(os);
}
f.close();
os.flush();
return count + start;
}
/**
* Represents the data source of this text.
*/
private interface Source {
Session open() throws IOException;
long length();
boolean exists();
}
/**
* Points to a byte in the buffer.
*/
private static class Mark {
protected ByteBuf buf;
protected int pos;
private Mark(ByteBuf buf) {
this.buf = buf;
}
}
/**
* Points to the start of the region that's not committed to the output yet.
*/
private static final class HeadMark extends Mark {
private HeadMark(ByteBuf buf) {
super(buf);
}
/**
* Moves this mark to 'that' mark, and writes the data to {@link OutputStream} if necessary.
*/
long moveTo(Mark that, OutputStream os) throws IOException {
long count = 0;
while (this.buf != that.buf) {
os.write(buf.buf, 0, buf.size);
count += buf.size;
buf = buf.next;
pos = 0;
}
this.pos = that.pos;
return count;
}
long finish(OutputStream os) throws IOException {
os.write(buf.buf, 0, pos);
return pos;
}
}
/**
* Points to the end of the region.
*/
private static final class TailMark extends Mark {
private TailMark(ByteBuf buf) {
super(buf);
}
boolean moveToNextLine(Session f) throws IOException {
while (true) {
while (pos == buf.size) {
if (!buf.isFull()) {
// read until EOF
return false;
} else {
// read into the next buffer
buf = new ByteBuf(buf, f);
pos = 0;
}
}
byte b = buf.buf[pos++];
if (b == '\r' || b == '\n') {
return true;
}
}
}
}
/**
* Variable length byte buffer implemented as a linked list of fixed length buffer.
*/
private static final class ByteBuf {
private final byte[] buf = new byte[8192];
private int size = 0;
private ByteBuf next;
private ByteBuf(ByteBuf previous, Session f) throws IOException {
if (previous != null) {
assert previous.next == null;
previous.next = this;
}
while (!this.isFull()) {
int chunk = f.read(buf, size, buf.length - size);
if (chunk == -1) {
return;
}
size += chunk;
}
}
public boolean isFull() {
return buf.length == size;
}
}
/**
* Represents the read session of the {@link Source}. Methods generally follow the contracts of {@link InputStream}.
*/
private interface Session {
void close() throws IOException;
void skip(long start) throws IOException;
int read(byte[] buf) throws IOException;
int read(byte[] buf, int offset, int length) throws IOException;
}
/**
* {@link Session} implementation over {@link RandomAccessFile}.
*/
private static final class FileSession implements Session {
private final RandomAccessFile file;
private FileSession(File file) throws IOException {
this.file = new RandomAccessFile(file, "r");
}
@Override
public void close() throws IOException {
file.close();
}
@Override
public void skip(long start) throws IOException {
file.seek(file.getFilePointer() + start);
}
@Override
public int read(byte[] buf) throws IOException {
return file.read(buf);
}
@Override
public int read(byte[] buf, int offset, int length) throws IOException {
return file.read(buf, offset, length);
}
}
}
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