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https://github.com/prometheus/node_exporter.git
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501ccf9fb4
* Add --collector.netdev.device-whitelist flag Sometimes it is desired to monitor only one netdev. The golang regexp does not support a negated regex, so the ignored-devices flag is too cumbersome for this task. This change introduces a new flag: accept-devices, which is mutually exclusive to ignored-devices. This flag allows specifying ONLY the netdev you'd like. Signed-off-by: Noam Meltzer <noam@cynerio.co>
92 lines
2.6 KiB
Go
92 lines
2.6 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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"strings"
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"github.com/prometheus/common/log"
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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) (map[string]map[string]string, 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)
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}
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func parseNetDevStats(r io.Reader, ignore *regexp.Regexp, accept *regexp.Regexp) (map[string]map[string]string, 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 := map[string]map[string]string{}
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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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log.Debugf("Ignoring device: %s", dev)
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continue
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}
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if accept != nil && !accept.MatchString(dev) {
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log.Debugf("Ignoring device: %s", 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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netDev[dev] = map[string]string{}
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for i := 0; i < len(receiveHeader); i++ {
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netDev[dev]["receive_"+receiveHeader[i]] = values[i]
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}
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for i := 0; i < len(transmitHeader); i++ {
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netDev[dev]["transmit_"+transmitHeader[i]] = values[i+len(receiveHeader)]
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}
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}
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return netDev, scanner.Err()
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}
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