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93 lines
2.4 KiB
93 lines
2.4 KiB
// Copyright 2015 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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//go:build !nofilefd
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// +build !nofilefd
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package collector
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import (
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"bytes"
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"fmt"
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"io"
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"log/slog"
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"os"
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"strconv"
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"github.com/prometheus/client_golang/prometheus"
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)
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const (
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fileFDStatSubsystem = "filefd"
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)
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type fileFDStatCollector struct {
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logger *slog.Logger
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}
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func init() {
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registerCollector(fileFDStatSubsystem, defaultEnabled, NewFileFDStatCollector)
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}
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// NewFileFDStatCollector returns a new Collector exposing file-nr stats.
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func NewFileFDStatCollector(logger *slog.Logger) (Collector, error) {
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return &fileFDStatCollector{logger}, nil
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}
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func (c *fileFDStatCollector) Update(ch chan<- prometheus.Metric) error {
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fileFDStat, err := parseFileFDStats(procFilePath("sys/fs/file-nr"))
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if err != nil {
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return fmt.Errorf("couldn't get file-nr: %w", err)
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}
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for name, value := range fileFDStat {
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v, err := strconv.ParseFloat(value, 64)
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if err != nil {
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return fmt.Errorf("invalid value %s in file-nr: %w", value, err)
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}
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ch <- prometheus.MustNewConstMetric(
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prometheus.NewDesc(
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prometheus.BuildFQName(namespace, fileFDStatSubsystem, name),
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fmt.Sprintf("File descriptor statistics: %s.", name),
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nil, nil,
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),
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prometheus.GaugeValue, v,
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)
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}
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return nil
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}
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func parseFileFDStats(filename string) (map[string]string, error) {
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file, err := os.Open(filename)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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content, err := io.ReadAll(file)
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if err != nil {
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return nil, err
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}
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parts := bytes.Split(bytes.TrimSpace(content), []byte("\u0009"))
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if len(parts) < 3 {
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return nil, fmt.Errorf("unexpected number of file stats in %q", filename)
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}
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var fileFDStat = map[string]string{}
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// The file-nr proc is only 1 line with 3 values.
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fileFDStat["allocated"] = string(parts[0])
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// The second value is skipped as it will always be zero in linux 2.6.
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fileFDStat["maximum"] = string(parts[2])
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return fileFDStat, nil
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}
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