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/*
 * Copyright 2024 Netflix, 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 io.mantisrx.runtime.loader.cgroups;

import io.mantisrx.shaded.org.apache.curator.shaded.com.google.common.base.Preconditions;
import io.vavr.Tuple2;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;
import lombok.AccessLevel;
import lombok.Getter;
import lombok.RequiredArgsConstructor;

@RequiredArgsConstructor
public class CgroupImpl implements Cgroup {

    private final String path;

    /**
     * Maybe change this to the below command in the future.
     * 

* ``` stat -fc %T /sys/fs/cgroup/ ``` This should return cgroup2fs for cgroupv2 and tmpfs for * cgroupv1. */ @Getter(lazy = true, value = AccessLevel.PRIVATE) private final boolean old = getSubsystems().size() > 0; @Override public Boolean isV1() { return isOld(); } @Override public List getMetrics(String subsystem, String metricName) throws IOException { Path metricPath = Paths.get(path, subsystem, metricName); try { return Files.readAllLines(metricPath) .stream() .findFirst() .map(s -> Arrays.asList(s.split(" "))) .orElse(Collections.emptyList()) .stream() .map(CgroupImpl::convertStringToLong) .collect(Collectors.toList()); } catch (Exception e) { throw new IOException(e); } } @Override public Long getMetric(String subsystem, String metricName) throws IOException { Path metricPath = Paths.get(path, subsystem, metricName); try { return Files.readAllLines(metricPath).stream().findFirst() .map(CgroupImpl::convertStringToLong).get(); } catch (Exception e) { throw new IOException(e); } } /** * Example usage: user 43873627 system 4185541 * * @param subsystem subsystem the stat file is part of. * @param stat name of the stat file * @return map of metrics to their corresponding values * @throws IOException */ @Override public Map getStats(String subsystem, String stat) throws IOException { Path statPath = Paths.get(path, subsystem, stat); return Files.readAllLines(statPath) .stream() .map(l -> { String[] parts = l.split("\\s+"); Preconditions.checkArgument(parts.length == 2, "Expected two parts only but was {} parts", parts.length); return new Tuple2<>(parts[0], convertStringToLong(parts[1])); }) .collect(Collectors.toMap(t -> t._1, t -> t._2)); } /** * Convert a number from its string representation to a long. * * @param strval: value to convert * @return The converted long value. Long max value is returned if the string representation * exceeds the range of type long. */ private static long convertStringToLong(String strval) { try { return Long.parseLong(strval); } catch (NumberFormatException e) { // For some properties (e.g. memory.limit_in_bytes, cgroups v1) we may overflow // the range of signed long. In this case, return Long max value. return Long.MAX_VALUE; } } private static final Set knownSubsystems = new HashSet<>(Arrays.asList("cpu", "cpuacct", "cpuset", "memory")); private List getSubsystems() { return Arrays.asList(Objects.requireNonNull(Paths.get(path).toFile().listFiles())) .stream() .filter(s -> s.isDirectory()) .map(s -> s.getName()) .filter(s -> knownSubsystems.contains(s)) .collect(Collectors.toList()); } }





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