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// Copyright 2019 The Prometheus 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.
// +build !nosoftnet
package collector
import (
"fmt"
"strconv"
"github.com/go-kit/kit/log"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs"
)
type softnetCollector struct {
fs procfs.FS
processed *prometheus.Desc
dropped *prometheus.Desc
timeSqueezed *prometheus.Desc
logger log.Logger
}
const (
softnetSubsystem = "softnet"
)
func init() {
registerCollector("softnet", defaultEnabled, NewSoftnetCollector)
}
// NewSoftnetCollector returns a new Collector exposing softnet metrics.
func NewSoftnetCollector(logger log.Logger) (Collector, error) {
fs, err := procfs.NewFS(*procPath)
if err != nil {
return nil, fmt.Errorf("failed to open procfs: %w", err)
}
return &softnetCollector{
fs: fs,
processed: prometheus.NewDesc(
prometheus.BuildFQName(namespace, softnetSubsystem, "processed_total"),
"Number of processed packets",
[]string{"cpu"}, nil,
),
dropped: prometheus.NewDesc(
prometheus.BuildFQName(namespace, softnetSubsystem, "dropped_total"),
"Number of dropped packets",
[]string{"cpu"}, nil,
),
timeSqueezed: prometheus.NewDesc(
prometheus.BuildFQName(namespace, softnetSubsystem, "times_squeezed_total"),
"Number of times processing packets ran out of quota",
[]string{"cpu"}, nil,
),
logger: logger,
}, nil
}
// Update gets parsed softnet statistics using procfs.
func (c *softnetCollector) Update(ch chan<- prometheus.Metric) error {
stats, err := c.fs.NetSoftnetStat()
if err != nil {
return fmt.Errorf("could not get softnet statistics: %w", err)
}
for cpuNumber, cpuStats := range stats {
cpu := strconv.Itoa(cpuNumber)
ch <- prometheus.MustNewConstMetric(
c.processed,
prometheus.CounterValue,
float64(cpuStats.Processed),
cpu,
)
ch <- prometheus.MustNewConstMetric(
c.dropped,
prometheus.CounterValue,
float64(cpuStats.Dropped),
cpu,
)
ch <- prometheus.MustNewConstMetric(
c.timeSqueezed,
prometheus.CounterValue,
float64(cpuStats.TimeSqueezed),
cpu,
)
}
return nil
}
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