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Web Agent introspection runtime
// Copyright 2015-2024 Nstream, inc.
//
// Licensed under the Redis Source Available License 2.0 (RSALv2) Agreement;
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://redis.com/legal/rsalv2-agreement/
//
// 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 nstream.reflect.model;
import swim.structure.Attr;
import swim.structure.Form;
import swim.structure.Item;
import swim.structure.Kind;
import swim.structure.Record;
import swim.structure.Value;
import swim.uri.Uri;
public class LogEntry {
protected final String tag;
protected final long time;
protected final Uri nodeUri;
protected final Uri laneUri;
protected final Value message;
public LogEntry(String tag, long time, Uri nodeUri, Uri laneUri, Value message) {
this.tag = tag;
this.time = time;
this.nodeUri = nodeUri;
this.laneUri = laneUri;
this.message = message;
}
public final String tag() {
return this.tag;
}
public final long time() {
return this.time;
}
public final Uri nodeUri() {
return this.nodeUri;
}
public final Uri laneUri() {
return this.laneUri;
}
public Value toValue() {
return form().mold(this).toValue();
}
public static LogEntry message(String tag, Uri nodeUri, Uri laneUri, Object message) {
final long time = System.currentTimeMillis();
return new LogEntry(tag, time, nodeUri, laneUri, Value.fromObject(message));
}
public static LogEntry trace(Uri nodeUri, Uri laneUri, Object message) {
return message("trace", nodeUri, laneUri, message);
}
public static LogEntry trace(Uri nodeUri, Object message) {
return message("trace", nodeUri, Uri.empty(), message);
}
public static LogEntry trace(Object message) {
return message("trace", Uri.empty(), Uri.empty(), message);
}
public static LogEntry debug(Uri nodeUri, Uri laneUri, Object message) {
return message("debug", nodeUri, laneUri, message);
}
public static LogEntry debug(Uri nodeUri, Object message) {
return message("debug", nodeUri, Uri.empty(), message);
}
public static LogEntry debug(Object message) {
return message("debug", Uri.empty(), Uri.empty(), message);
}
public static LogEntry info(Uri nodeUri, Uri laneUri, Object message) {
return message("info", nodeUri, laneUri, message);
}
public static LogEntry info(Uri nodeUri, Object message) {
return message("info", nodeUri, Uri.empty(), message);
}
public static LogEntry info(Object message) {
return message("info", Uri.empty(), Uri.empty(), message);
}
public static LogEntry warn(Uri nodeUri, Uri laneUri, Object message) {
return message("warn", nodeUri, laneUri, message);
}
public static LogEntry warn(Uri nodeUri, Object message) {
return message("warn", nodeUri, Uri.empty(), message);
}
public static LogEntry warn(Object message) {
return message("warn", Uri.empty(), Uri.empty(), message);
}
public static LogEntry error(Uri nodeUri, Uri laneUri, Object message) {
return message("error", nodeUri, laneUri, message);
}
public static LogEntry error(Uri nodeUri, Object message) {
return message("error", nodeUri, Uri.empty(), message);
}
public static LogEntry error(Object message) {
return message("error", Uri.empty(), Uri.empty(), message);
}
public static LogEntry fail(Uri nodeUri, Uri laneUri, Throwable cause) {
return message("fail", nodeUri, laneUri, moldException(cause));
}
public static LogEntry fail(Uri nodeUri, Throwable cause) {
return message("fail", nodeUri, Uri.empty(), moldException(cause));
}
public static LogEntry fail(Throwable cause) {
return message("fail", Uri.empty(), Uri.empty(), moldException(cause));
}
private static Form form;
@Kind
public static Form form() {
if (form == null) {
form = new LogEntryForm();
}
return form;
}
static Value moldException(Throwable cause) {
final StackTraceElement[] frames = cause.getStackTrace();
final int frameCount = frames.length;
final Record record = Record.create(1 + frameCount)
.attr("exception", cause.getMessage());
for (int i = 0; i < frameCount; i += 1) {
record.item(moldStackFrame(frames[i]));
}
return record;
}
static Value moldStackFrame(StackTraceElement frame) {
final Record header = Record.create(4)
.slot("class", frame.getClassName())
.slot("method", frame.getMethodName());
if (frame.isNativeMethod()) {
header.slot("native", true);
}
if (frame.getFileName() != null) {
header.slot("file", frame.getFileName());
}
if (frame.getLineNumber() >= 0) {
header.slot("line", frame.getLineNumber());
}
return Record.create(1).attr("at", header);
}
}
final class LogEntryForm extends Form {
@Override
public Class type() {
return LogEntry.class;
}
@Override
public Item mold(LogEntry entry) {
if (entry != null) {
final Record header = Record.create(3);
header.slot("time", entry.time);
if (entry.nodeUri.isDefined()) {
header.slot("node", entry.nodeUri.toString());
}
if (entry.laneUri.isDefined()) {
header.slot("lane", entry.laneUri.toString());
}
return Attr.of(entry.tag, header).concat(entry.message);
} else {
return Item.extant();
}
}
@Override
public LogEntry cast(Item item) {
final Value value = item.toValue();
final Item head = value.head();
if (head instanceof Attr) {
final String tag = ((Attr) head).name();
final Value header = ((Attr) head).value();
final long time = header.get("time").longValue(0L);
final Uri nodeUri = header.get("node").coerce(Uri.form());
final Uri laneUri = header.get("lane").coerce(Uri.form());
final Value message = value.body();
return new LogEntry(tag, time, nodeUri, laneUri, message);
}
return null;
}
}