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package org.onap.vid.controller;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.core.Appender;
import ch.qos.logback.core.FileAppender;
import ch.qos.logback.core.spi.AppenderAttachable;
import org.apache.commons.io.input.ReversedLinesFileReader;
import org.apache.commons.lang3.StringUtils;
import org.onap.portalsdk.core.controller.RestrictedBaseController;
import org.onap.portalsdk.core.logging.logic.EELFLoggerDelegate;
import org.onap.vid.model.ExceptionResponse;
import org.onap.vid.roles.Role;
import org.onap.vid.roles.RoleProvider;
import org.onap.vid.utils.Streams;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.*;
import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.InternalServerErrorException;
import javax.ws.rs.NotAuthorizedException;
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Objects;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static com.att.eelf.configuration.Configuration.GENERAL_LOGGER_NAME;
@RestController
@RequestMapping("logger")
public class LoggerController extends RestrictedBaseController {
private static final EELFLoggerDelegate LOGGER = EELFLoggerDelegate.getLogger(LoggerController.class);
@Autowired
RoleProvider roleProvider;
@RequestMapping(value = "/{loggerName:audit|error|metrics}", method = RequestMethod.GET)
public String getLog(@PathVariable String loggerName, HttpServletRequest request,
@RequestParam(value="limit", defaultValue = "5000") Integer limit) throws IOException {
List<Role> roles = roleProvider.getUserRoles(request);
boolean userPermitted = roleProvider.userPermissionIsReadLogs(roles);
if (!userPermitted) {
throw new NotAuthorizedException("User not authorized to get logs");
}
String logfilePath = getLogfilePath(loggerName);
try (final ReversedLinesFileReader reader = new ReversedLinesFileReader(new File(logfilePath))) {
Supplier<String> reverseLinesSupplier = () -> {
try {
return reader.readLine();
} catch (NullPointerException e) {
// EOF Reached
return null;
} catch (IOException e) {
throw new InternalServerErrorException("error while reading " + logfilePath, e);
}
};
return Streams.takeWhile(
Stream.generate(reverseLinesSupplier),
line -> !StringUtils.contains(line, "Logging is started"))
.limit(limit)
.limit(5_000)
.filter(Objects::nonNull)
.collect(Collectors.joining("\n"));
}
}
private String getLogfilePath(String loggerName) {
/*
Find the requested logger, and pull all of it's appenders.
Find the first of the appenders that is a FileAppender, and return it's
write-out filename.
*/
LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();
return context.getLoggerList().stream()
.filter(logger -> logger.getName().equals(GENERAL_LOGGER_NAME + "." + loggerName))
.flatMap(this::pullSubAppenders)
.flatMap(appender -> {
// Appender might be "attachable", if so - roll-up its sub-appenders
return (appender instanceof AppenderAttachable) ?
pullSubAppenders((AppenderAttachable<?>) appender) : Stream.of(appender);
})
.filter(appender -> appender instanceof FileAppender)
.map(appender -> (FileAppender<?>) appender)
.map(FileAppender::getFile)
.findFirst()
.orElseThrow(() -> new InternalServerErrorException("logfile for " + loggerName + " not found"));
}
private <T> Stream<Appender<T>> pullSubAppenders(AppenderAttachable<T> logger) {
return Streams.fromIterator(logger.iteratorForAppenders());
}
@ExceptionHandler({ NotAuthorizedException.class })
@ResponseStatus(HttpStatus.UNAUTHORIZED)
public String notAuthorizedHandler(NotAuthorizedException e) {
return "UNAUTHORIZED";
}
@ExceptionHandler({ IOException.class, InternalServerErrorException.class })
@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
public ExceptionResponse ioExceptionHandler(Exception e) {
return ControllersUtils.handleException(e, LOGGER);
}
}
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