mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-11-25 06:16:26 +01:00
107 lines
2.6 KiB
Go
107 lines
2.6 KiB
Go
// 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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// +build !nointerrupts
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package collector
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import (
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"bufio"
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"errors"
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"fmt"
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"io"
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"os"
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"strconv"
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"strings"
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"github.com/prometheus/client_golang/prometheus"
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)
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var (
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interruptLabelNames = []string{"CPU", "type", "info", "devices"}
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)
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func (c *interruptsCollector) Update(ch chan<- prometheus.Metric) (err error) {
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interrupts, err := getInterrupts()
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if err != nil {
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return fmt.Errorf("couldn't get interrupts: %s", err)
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}
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for name, interrupt := range interrupts {
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for cpuNo, value := range interrupt.values {
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fv, err := strconv.ParseFloat(value, 64)
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if err != nil {
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return fmt.Errorf("invalid value %s in interrupts: %s", value, err)
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}
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labels := prometheus.Labels{
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"CPU": strconv.Itoa(cpuNo),
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"type": name,
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"info": interrupt.info,
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"devices": interrupt.devices,
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}
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c.metric.With(labels).Set(fv)
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}
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}
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c.metric.Collect(ch)
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return err
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}
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type interrupt struct {
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info string
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devices string
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values []string
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}
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func getInterrupts() (map[string]interrupt, error) {
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file, err := os.Open(procFilePath("interrupts"))
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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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return parseInterrupts(file)
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}
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func parseInterrupts(r io.Reader) (map[string]interrupt, error) {
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var (
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interrupts = map[string]interrupt{}
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scanner = bufio.NewScanner(r)
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)
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if !scanner.Scan() {
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return nil, errors.New("interrupts empty")
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}
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cpuNum := len(strings.Fields(string(scanner.Text()))) // one header per cpu
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for scanner.Scan() {
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line := scanner.Text()
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parts := strings.Fields(string(line))
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if len(parts) < cpuNum+2 { // irq + one column per cpu + details,
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continue // we ignore ERR and MIS for now
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}
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intName := parts[0][:len(parts[0])-1] // remove trailing :
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intr := interrupt{
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values: parts[1:cpuNum],
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}
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if _, err := strconv.Atoi(intName); err == nil { // numeral interrupt
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intr.info = parts[cpuNum+1]
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intr.devices = strings.Join(parts[cpuNum+2:], " ")
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} else {
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intr.info = strings.Join(parts[cpuNum+1:], " ")
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}
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interrupts[intName] = intr
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}
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return interrupts, nil
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}
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