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iostatMetric.go
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iostatMetric.go
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package collectors
import (
"bufio"
"os"
cclog "github.com/ClusterCockpit/cc-metric-collector/pkg/ccLogger"
lp "github.com/ClusterCockpit/cc-metric-collector/pkg/ccMetric"
// "log"
"encoding/json"
"errors"
"strconv"
"strings"
"time"
)
const IOSTATFILE = `/proc/diskstats`
const IOSTAT_SYSFSPATH = `/sys/block`
type IOstatCollectorConfig struct {
ExcludeMetrics []string `json:"exclude_metrics,omitempty"`
}
type IOstatCollectorEntry struct {
lastValues map[string]int64
tags map[string]string
}
type IOstatCollector struct {
metricCollector
matches map[string]int
config IOstatCollectorConfig
devices map[string]IOstatCollectorEntry
}
func (m *IOstatCollector) Init(config json.RawMessage) error {
var err error
m.name = "IOstatCollector"
m.parallel = true
m.meta = map[string]string{"source": m.name, "group": "Disk"}
m.setup()
if len(config) > 0 {
err = json.Unmarshal(config, &m.config)
if err != nil {
return err
}
}
// https://www.kernel.org/doc/html/latest/admin-guide/iostats.html
matches := map[string]int{
"io_reads": 3,
"io_reads_merged": 4,
"io_read_sectors": 5,
"io_read_ms": 6,
"io_writes": 7,
"io_writes_merged": 8,
"io_writes_sectors": 9,
"io_writes_ms": 10,
"io_ioops": 11,
"io_ioops_ms": 12,
"io_ioops_weighted_ms": 13,
"io_discards": 14,
"io_discards_merged": 15,
"io_discards_sectors": 16,
"io_discards_ms": 17,
"io_flushes": 18,
"io_flushes_ms": 19,
}
m.devices = make(map[string]IOstatCollectorEntry)
m.matches = make(map[string]int)
for k, v := range matches {
if _, skip := stringArrayContains(m.config.ExcludeMetrics, k); !skip {
m.matches[k] = v
}
}
if len(m.matches) == 0 {
return errors.New("no metrics to collect")
}
file, err := os.Open(string(IOSTATFILE))
if err != nil {
cclog.ComponentError(m.name, err.Error())
return err
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
linefields := strings.Fields(line)
device := linefields[2]
if strings.Contains(device, "loop") {
continue
}
values := make(map[string]int64)
for m := range m.matches {
values[m] = 0
}
m.devices[device] = IOstatCollectorEntry{
tags: map[string]string{
"device": linefields[2],
"type": "node",
},
lastValues: values,
}
}
m.init = true
return err
}
func (m *IOstatCollector) Read(interval time.Duration, output chan lp.CCMetric) {
if !m.init {
return
}
file, err := os.Open(string(IOSTATFILE))
if err != nil {
cclog.ComponentError(m.name, err.Error())
return
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
if len(line) == 0 {
continue
}
linefields := strings.Fields(line)
device := linefields[2]
if strings.Contains(device, "loop") {
continue
}
if _, ok := m.devices[device]; !ok {
continue
}
entry := m.devices[device]
for name, idx := range m.matches {
if idx < len(linefields) {
x, err := strconv.ParseInt(linefields[idx], 0, 64)
if err == nil {
diff := x - entry.lastValues[name]
y, err := lp.New(name, entry.tags, m.meta, map[string]interface{}{"value": int(diff)}, time.Now())
if err == nil {
output <- y
}
}
entry.lastValues[name] = x
}
}
m.devices[device] = entry
}
}
func (m *IOstatCollector) Close() {
m.init = false
}