/*
* Copyright © 2014 Cask Data, Inc.
*
* 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 co.cask.cdap.logging.gateway.handlers;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.PatternLayout;
import co.cask.cdap.logging.read.Callback;
import co.cask.cdap.logging.read.LogEvent;
import co.cask.http.HttpResponder;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import org.apache.commons.lang.StringEscapeUtils;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Callback to handle log events from LogReader.
*/
class LogReaderCallback implements Callback {
private final JsonArray logResults;
private final HttpResponder responder;
private final PatternLayout patternLayout;
private final boolean escape;
LogReaderCallback(HttpResponder responder, String logPattern, boolean escape) {
this.logResults = new JsonArray();
this.responder = responder;
this.escape = escape;
ch.qos.logback.classic.Logger rootLogger =
(ch.qos.logback.classic.Logger) LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME);
LoggerContext loggerContext = rootLogger.getLoggerContext();
this.patternLayout = new PatternLayout();
this.patternLayout.setContext(loggerContext);
this.patternLayout.setPattern(logPattern);
}
@Override
public void init() {
patternLayout.start();
}
@Override
public void handle(LogEvent event) {
String log = patternLayout.doLayout(event.getLoggingEvent());
log = escape ? StringEscapeUtils.escapeHtml(log) : log;
JsonObject jsonObject = new JsonObject();
jsonObject.addProperty("log", log);
jsonObject.addProperty("offset", event.getOffset());
logResults.add(jsonObject);
}
@Override
public void close() {
patternLayout.stop();
responder.sendJson(HttpResponseStatus.OK, logResults);
}
}