Kiu/Node_Exporter
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Moving buddyinfo logic to procfs

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This commit is contained in:
Thorhallur Sverrisson 2017-02-07 08:30:49 -06:00
parent 2f16f6b84e
commit 55417d7688
1 changed files with 9 additions and 47 deletions
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56
collector/buddyinfo.go
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@ -1,4 +1,4 @@
// Copyright 2015 The Prometheus Authors
// Copyright 2017 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
@ -17,19 +17,14 @@
package collector
import (
"bufio"
"fmt"
"io"
"os"
"strconv"
"strings"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
"github.com/prometheus/procfs"
)
type buddyInfo map[string]map[string][]float64
const (
buddyInfoSubsystem = "buddyinfo"
)
@ -55,10 +50,16 @@ func NewBuddyinfoCollector() (Collector, error) {
// Update calls (*buddyinfoCollector).getBuddyInfo to get the platform specific
// buddyinfo metrics.
func (c *buddyinfoCollector) Update(ch chan<- prometheus.Metric) (err error) {
buddyInfo, err := c.getBuddyInfo()
fs, err := procfs.NewFS(*procPath)
if err != nil {
return fmt.Errorf("failed to open procfs: %v", err)
}
buddyInfo, err := fs.NewBuddyInfo()
if err != nil {
return fmt.Errorf("couldn't get buddyinfo: %s", err)
}
log.Debugf("Set node_buddy: %#v", buddyInfo)
for node, zones := range buddyInfo {
for zone, values := range zones {
@ -73,42 +74,3 @@ func (c *buddyinfoCollector) Update(ch chan<- prometheus.Metric) (err error) {
}
return nil
}
func (c *buddyinfoCollector) getBuddyInfo() (buddyInfo, error) {
file, err := os.Open(procFilePath("buddyinfo"))
if err != nil {
return nil, err
}
defer file.Close()
return parseBuddyInfo(file)
}
func parseBuddyInfo(r io.Reader) (buddyInfo, error) {
var (
buddyInfo = buddyInfo{}
scanner = bufio.NewScanner(r)
)
for scanner.Scan() {
var err error
line := scanner.Text()
parts := strings.Fields(string(line))
node := strings.TrimRight(parts[1], ",")
zone := strings.TrimRight(parts[3], ",")
arraySize := len(parts[4:])
sizes := make([]float64, arraySize)
for i := 0; i < arraySize; i++ {
sizes[i], err = strconv.ParseFloat(parts[i+4], 64)
if err != nil {
return nil, fmt.Errorf("invalid value in buddyinfo: %s", err)
}
}
if _, ok := buddyInfo[node]; !ok {
buddyInfo[node] = make(map[string][]float64)
}
buddyInfo[node][zone] = sizes
}
return buddyInfo, nil
}