feat: Waku v2 bridge

Issue #12610

vendor/github.com/containerd/cgroups/cpu.go

@@ -0,0 +1,125 @@
+/*
+   Copyright The containerd Authors.
+
+   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 cgroups
+
+import (
+	"bufio"
+	"os"
+	"path/filepath"
+	"strconv"
+
+	v1 "github.com/containerd/cgroups/stats/v1"
+	specs "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+func NewCpu(root string) *cpuController {
+	return &cpuController{
+		root: filepath.Join(root, string(Cpu)),
+	}
+}
+
+type cpuController struct {
+	root string
+}
+
+func (c *cpuController) Name() Name {
+	return Cpu
+}
+
+func (c *cpuController) Path(path string) string {
+	return filepath.Join(c.root, path)
+}
+
+func (c *cpuController) Create(path string, resources *specs.LinuxResources) error {
+	if err := os.MkdirAll(c.Path(path), defaultDirPerm); err != nil {
+		return err
+	}
+	if cpu := resources.CPU; cpu != nil {
+		for _, t := range []struct {
+			name   string
+			ivalue *int64
+			uvalue *uint64
+		}{
+			{
+				name:   "rt_period_us",
+				uvalue: cpu.RealtimePeriod,
+			},
+			{
+				name:   "rt_runtime_us",
+				ivalue: cpu.RealtimeRuntime,
+			},
+			{
+				name:   "shares",
+				uvalue: cpu.Shares,
+			},
+			{
+				name:   "cfs_period_us",
+				uvalue: cpu.Period,
+			},
+			{
+				name:   "cfs_quota_us",
+				ivalue: cpu.Quota,
+			},
+		} {
+			var value []byte
+			if t.uvalue != nil {
+				value = []byte(strconv.FormatUint(*t.uvalue, 10))
+			} else if t.ivalue != nil {
+				value = []byte(strconv.FormatInt(*t.ivalue, 10))
+			}
+			if value != nil {
+				if err := retryingWriteFile(
+					filepath.Join(c.Path(path), "cpu."+t.name),
+					value,
+					defaultFilePerm,
+				); err != nil {
+					return err
+				}
+			}
+		}
+	}
+	return nil
+}
+
+func (c *cpuController) Update(path string, resources *specs.LinuxResources) error {
+	return c.Create(path, resources)
+}
+
+func (c *cpuController) Stat(path string, stats *v1.Metrics) error {
+	f, err := os.Open(filepath.Join(c.Path(path), "cpu.stat"))
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	// get or create the cpu field because cpuacct can also set values on this struct
+	sc := bufio.NewScanner(f)
+	for sc.Scan() {
+		key, v, err := parseKV(sc.Text())
+		if err != nil {
+			return err
+		}
+		switch key {
+		case "nr_periods":
+			stats.CPU.Throttling.Periods = v
+		case "nr_throttled":
+			stats.CPU.Throttling.ThrottledPeriods = v
+		case "throttled_time":
+			stats.CPU.Throttling.ThrottledTime = v
+		}
+	}
+	return sc.Err()
+}