com.kajj.tools.logviewer.LogViewerRestController.java Source code

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Here is the source code for com.kajj.tools.logviewer.LogViewerRestController.java

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/*
 * Copyright 2014 Andrew Tytula.
 *
 * 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.kajj.tools.logviewer;

import java.io.IOException;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.ResourceAccessException;

/**
 * Presentation layer for the log viewer.
 *
 * @author Andrew Tytula
 */
@RestController
public class LogViewerRestController {

    @Autowired
    private LogRepository logRepository;

    /**
     * Returns the last <code>numberOfLines</code> from the specified log file. The log file must
     * be in the containers log directory to be read.
     *
     * @param fileName the name of the log file.
     * @param numberOfLines the number of lines to return in the tail.
     * @return The last <code>numberOfLines</code> of the specified log file.
     */
    @RequestMapping(value = "/logs/{fileName}/tail", method = RequestMethod.GET, produces = MediaType.TEXT_PLAIN_VALUE)
    public ResponseEntity<String> tailLog(@PathVariable final String fileName,
            @RequestParam(value = "lines", defaultValue = "100") final int numberOfLines) {
        try {
            final List<String> logs = logRepository.getTailLog(fileName, numberOfLines);

            final StringBuilder tail = new StringBuilder();
            int i = 1;
            for (final String log : logs) {
                tail.append(i++).append(": ").append(log).append("\n");
            }

            return new ResponseEntity(tail.toString(), HttpStatus.OK);
        } catch (final IOException ioe) {
            throw new ResourceAccessException("Unable to read log file", ioe);
        }
    }

    @RequestMapping(value = "/logs", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<List<String>> getlogFileNames() {
        final List<String> logFileNames = logRepository.getLogFileNames();
        return new ResponseEntity(logFileNames, HttpStatus.OK);
    }
}