435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
92 lines
2.8 KiB
Go
92 lines
2.8 KiB
Go
// Copyright 2019 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package procfs
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import (
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"fmt"
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"io/ioutil"
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"strconv"
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"strings"
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)
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// For the proc file format details,
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// see https://elixir.bootlin.com/linux/v4.17/source/net/core/net-procfs.c#L162
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// and https://elixir.bootlin.com/linux/v4.17/source/include/linux/netdevice.h#L2810.
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// SoftnetEntry contains a single row of data from /proc/net/softnet_stat
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type SoftnetEntry struct {
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// Number of processed packets
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Processed uint
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// Number of dropped packets
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Dropped uint
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// Number of times processing packets ran out of quota
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TimeSqueezed uint
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}
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// GatherSoftnetStats reads /proc/net/softnet_stat, parse the relevant columns,
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// and then return a slice of SoftnetEntry's.
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func (fs FS) GatherSoftnetStats() ([]SoftnetEntry, error) {
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data, err := ioutil.ReadFile(fs.proc.Path("net/softnet_stat"))
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if err != nil {
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return nil, fmt.Errorf("error reading softnet %s: %s", fs.proc.Path("net/softnet_stat"), err)
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}
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return parseSoftnetEntries(data)
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}
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func parseSoftnetEntries(data []byte) ([]SoftnetEntry, error) {
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lines := strings.Split(string(data), "\n")
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entries := make([]SoftnetEntry, 0)
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var err error
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const (
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expectedColumns = 11
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)
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for _, line := range lines {
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columns := strings.Fields(line)
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width := len(columns)
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if width == 0 {
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continue
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}
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if width != expectedColumns {
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return []SoftnetEntry{}, fmt.Errorf("%d columns were detected, but %d were expected", width, expectedColumns)
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}
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var entry SoftnetEntry
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if entry, err = parseSoftnetEntry(columns); err != nil {
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return []SoftnetEntry{}, err
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}
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entries = append(entries, entry)
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}
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return entries, nil
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}
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func parseSoftnetEntry(columns []string) (SoftnetEntry, error) {
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var err error
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var processed, dropped, timeSqueezed uint64
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if processed, err = strconv.ParseUint(columns[0], 16, 32); err != nil {
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return SoftnetEntry{}, fmt.Errorf("Unable to parse column 0: %s", err)
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}
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if dropped, err = strconv.ParseUint(columns[1], 16, 32); err != nil {
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return SoftnetEntry{}, fmt.Errorf("Unable to parse column 1: %s", err)
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}
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if timeSqueezed, err = strconv.ParseUint(columns[2], 16, 32); err != nil {
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return SoftnetEntry{}, fmt.Errorf("Unable to parse column 2: %s", err)
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}
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return SoftnetEntry{
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Processed: uint(processed),
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Dropped: uint(dropped),
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TimeSqueezed: uint(timeSqueezed),
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}, nil
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}
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