mirror of
https://github.com/prometheus/node_exporter.git
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66fb6762bf
* Check interface name before loading interface data * Reduce indentation * Optimize nested netdev map This change avoids conversion to strings and back. Signed-off-by: Julian Kornberger <jk+github@digineo.de>
106 lines
3 KiB
Go
106 lines
3 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 !nonetdev
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package collector
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"regexp"
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"strconv"
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"strings"
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"github.com/go-kit/kit/log"
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"github.com/go-kit/kit/log/level"
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)
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var (
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procNetDevInterfaceRE = regexp.MustCompile(`^(.+): *(.+)$`)
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procNetDevFieldSep = regexp.MustCompile(` +`)
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)
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func getNetDevStats(ignore *regexp.Regexp, accept *regexp.Regexp, logger log.Logger) (netDevStats, error) {
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file, err := os.Open(procFilePath("net/dev"))
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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 parseNetDevStats(file, ignore, accept, logger)
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}
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func parseNetDevStats(r io.Reader, ignore *regexp.Regexp, accept *regexp.Regexp, logger log.Logger) (netDevStats, error) {
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scanner := bufio.NewScanner(r)
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scanner.Scan() // skip first header
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scanner.Scan()
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parts := strings.Split(scanner.Text(), "|")
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if len(parts) != 3 { // interface + receive + transmit
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return nil, fmt.Errorf("invalid header line in net/dev: %s",
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scanner.Text())
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}
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receiveHeader := strings.Fields(parts[1])
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transmitHeader := strings.Fields(parts[2])
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headerLength := len(receiveHeader) + len(transmitHeader)
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netDev := netDevStats{}
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for scanner.Scan() {
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line := strings.TrimLeft(scanner.Text(), " ")
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parts := procNetDevInterfaceRE.FindStringSubmatch(line)
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if len(parts) != 3 {
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return nil, fmt.Errorf("couldn't get interface name, invalid line in net/dev: %q", line)
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}
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dev := parts[1]
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if ignore != nil && ignore.MatchString(dev) {
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level.Debug(logger).Log("msg", "Ignoring device", "device", dev)
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continue
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}
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if accept != nil && !accept.MatchString(dev) {
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level.Debug(logger).Log("msg", "Ignoring device", "device", dev)
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continue
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}
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values := procNetDevFieldSep.Split(strings.TrimLeft(parts[2], " "), -1)
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if len(values) != headerLength {
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return nil, fmt.Errorf("couldn't get values, invalid line in net/dev: %q", parts[2])
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}
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devStats := map[string]uint64{}
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addStats := func(key, value string) {
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v, err := strconv.ParseUint(value, 0, 64)
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if err != nil {
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level.Debug(logger).Log("msg", "invalid value in netstats", "key", key, "value", value, "err", err)
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return
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}
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devStats[key] = v
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}
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for i := 0; i < len(receiveHeader); i++ {
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addStats("receive_"+receiveHeader[i], values[i])
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}
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for i := 0; i < len(transmitHeader); i++ {
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addStats("transmit_"+transmitHeader[i], values[i+len(receiveHeader)])
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}
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netDev[dev] = devStats
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}
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return netDev, scanner.Err()
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}
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