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memstatMetric.go
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/
memstatMetric.go
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package collectors
import (
"bufio"
"encoding/json"
"errors"
"fmt"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
"time"
cclog "github.com/ClusterCockpit/cc-metric-collector/internal/ccLogger"
lp "github.com/ClusterCockpit/cc-metric-collector/internal/ccMetric"
)
const MEMSTATFILE = "/proc/meminfo"
const NUMA_MEMSTAT_BASE = "/sys/devices/system/node"
type MemstatCollectorConfig struct {
ExcludeMetrics []string `json:"exclude_metrics"`
NodeStats bool `json:"node_stats,omitempty"`
NumaStats bool `json:"numa_stats,omitempty"`
}
type MemstatCollectorNode struct {
file string
tags map[string]string
}
type MemstatCollector struct {
metricCollector
stats map[string]int64
tags map[string]string
matches map[string]string
config MemstatCollectorConfig
nodefiles map[int]MemstatCollectorNode
sendMemUsed bool
}
type MemstatStats struct {
value float64
unit string
}
func getStats(filename string) map[string]MemstatStats {
stats := make(map[string]MemstatStats)
file, err := os.Open(filename)
if err != nil {
cclog.Error(err.Error())
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
linefields := strings.Fields(line)
if len(linefields) == 3 {
v, err := strconv.ParseFloat(linefields[1], 64)
if err == nil {
stats[strings.Trim(linefields[0], ":")] = MemstatStats{
value: v,
unit: linefields[2],
}
}
} else if len(linefields) == 5 {
v, err := strconv.ParseFloat(linefields[3], 64)
if err == nil {
stats[strings.Trim(linefields[0], ":")] = MemstatStats{
value: v,
unit: linefields[4],
}
}
}
}
return stats
}
func (m *MemstatCollector) Init(config json.RawMessage) error {
var err error
m.name = "MemstatCollector"
m.config.NodeStats = true
m.config.NumaStats = false
if len(config) > 0 {
err = json.Unmarshal(config, &m.config)
if err != nil {
return err
}
}
m.meta = map[string]string{"source": m.name, "group": "Memory"}
m.stats = make(map[string]int64)
m.matches = make(map[string]string)
m.tags = map[string]string{"type": "node"}
matches := map[string]string{
"MemTotal": "mem_total",
"SwapTotal": "swap_total",
"SReclaimable": "mem_sreclaimable",
"Slab": "mem_slab",
"MemFree": "mem_free",
"Buffers": "mem_buffers",
"Cached": "mem_cached",
"MemAvailable": "mem_available",
"SwapFree": "swap_free",
"MemShared": "mem_shared",
}
for k, v := range matches {
_, skip := stringArrayContains(m.config.ExcludeMetrics, k)
if !skip {
m.matches[k] = v
}
}
m.sendMemUsed = false
if _, skip := stringArrayContains(m.config.ExcludeMetrics, "mem_used"); !skip {
m.sendMemUsed = true
}
if len(m.matches) == 0 {
return errors.New("no metrics to collect")
}
m.setup()
if m.config.NodeStats {
if stats := getStats(MEMSTATFILE); len(stats) == 0 {
return fmt.Errorf("cannot read data from file %s", MEMSTATFILE)
}
}
if m.config.NumaStats {
globPattern := filepath.Join(NUMA_MEMSTAT_BASE, "node[0-9]*", "meminfo")
regex := regexp.MustCompile(filepath.Join(NUMA_MEMSTAT_BASE, "node(\\d+)", "meminfo"))
files, err := filepath.Glob(globPattern)
if err == nil {
m.nodefiles = make(map[int]MemstatCollectorNode)
for _, f := range files {
if stats := getStats(f); len(stats) == 0 {
return fmt.Errorf("cannot read data from file %s", f)
}
rematch := regex.FindStringSubmatch(f)
if len(rematch) == 2 {
id, err := strconv.Atoi(rematch[1])
if err == nil {
f := MemstatCollectorNode{
file: f,
tags: map[string]string{
"type": "memoryDomain",
"type-id": fmt.Sprintf("%d", id),
},
}
m.nodefiles[id] = f
}
}
}
}
}
m.init = true
return err
}
func (m *MemstatCollector) Read(interval time.Duration, output chan lp.CCMetric) {
if !m.init {
return
}
sendStats := func(stats map[string]MemstatStats, tags map[string]string) {
for match, name := range m.matches {
var value float64 = 0
var unit string = ""
if v, ok := stats[match]; ok {
value = v.value
if len(v.unit) > 0 {
unit = v.unit
}
}
y, err := lp.New(name, tags, m.meta, map[string]interface{}{"value": value}, time.Now())
if err == nil {
if len(unit) > 0 {
y.AddMeta("unit", unit)
}
output <- y
}
}
if m.sendMemUsed {
memUsed := 0.0
unit := ""
if totalVal, total := stats["MemTotal"]; total {
if freeVal, free := stats["MemFree"]; free {
if bufVal, buffers := stats["Buffers"]; buffers {
if cacheVal, cached := stats["Cached"]; cached {
memUsed = totalVal.value - (freeVal.value + bufVal.value + cacheVal.value)
if len(totalVal.unit) > 0 {
unit = totalVal.unit
} else if len(freeVal.unit) > 0 {
unit = freeVal.unit
} else if len(bufVal.unit) > 0 {
unit = bufVal.unit
} else if len(cacheVal.unit) > 0 {
unit = cacheVal.unit
}
}
}
}
}
y, err := lp.New("mem_used", tags, m.meta, map[string]interface{}{"value": memUsed}, time.Now())
if err == nil {
if len(unit) > 0 {
y.AddMeta("unit", unit)
}
output <- y
}
}
}
if m.config.NodeStats {
nodestats := getStats(MEMSTATFILE)
sendStats(nodestats, m.tags)
}
if m.config.NumaStats {
for _, nodeConf := range m.nodefiles {
stats := getStats(nodeConf.file)
sendStats(stats, nodeConf.tags)
}
}
}
func (m *MemstatCollector) Close() {
m.init = false
}