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// Copyright 2015 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
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !nointerrupts
package collector
import (
"bufio"
"errors"
"fmt"
"io"
"os"
"strconv"
"strings"
"github.com/prometheus/client_golang/prometheus"
)
var (
interruptLabelNames = []string{"cpu", "type", "info", "devices"}
)
func (c *interruptsCollector) Update(ch chan<- prometheus.Metric) (err error) {
interrupts, err := getInterrupts()
if err != nil {
return fmt.Errorf("couldn't get interrupts: %s", err)
}
for name, interrupt := range interrupts {
for cpuNo, value := range interrupt.values {
fv, err := strconv.ParseFloat(value, 64)
if err != nil {
return fmt.Errorf("invalid value %s in interrupts: %s", value, err)
}
ch <- c.desc.mustNewConstMetric(fv, strconv.Itoa(cpuNo), name, interrupt.info, interrupt.devices)
}
}
return err
}
type interrupt struct {
info string
devices string
values []string
}
func getInterrupts() (map[string]interrupt, error) {
file, err := os.Open(procFilePath("interrupts"))
if err != nil {
return nil, err
}
defer file.Close()
return parseInterrupts(file)
}
func parseInterrupts(r io.Reader) (map[string]interrupt, error) {
var (
interrupts = map[string]interrupt{}
scanner = bufio.NewScanner(r)
)
if !scanner.Scan() {
return nil, errors.New("interrupts empty")
}
cpuNum := len(strings.Fields(scanner.Text())) // one header per cpu
for scanner.Scan() {
parts := strings.Fields(scanner.Text())
if len(parts) < cpuNum+2 { // irq + one column per cpu + details,
continue // we ignore ERR and MIS for now
}
intName := parts[0][:len(parts[0])-1] // remove trailing :
intr := interrupt{
values: parts[1 : cpuNum+1],
}
if _, err := strconv.Atoi(intName); err == nil { // numeral interrupt
intr.info = parts[cpuNum+1]
intr.devices = strings.Join(parts[cpuNum+2:], " ")
} else {
intr.info = strings.Join(parts[cpuNum+1:], " ")
}
interrupts[intName] = intr
}
return interrupts, scanner.Err()
}
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