telegraf/plugins/inputs/unbound/unbound.go

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package unbound
import (
"bufio"
"bytes"
"context"
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"fmt"
"net"
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"os/exec"
"strconv"
"strings"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/filter"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/plugins/inputs"
)
type runner func(cmdName string, Timeout internal.Duration, UseSudo bool, Server string, ThreadAsTag bool) (*bytes.Buffer, error)
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// Unbound is used to store configuration values
type Unbound struct {
Binary string
Timeout internal.Duration
UseSudo bool
Server string
ThreadAsTag bool
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filter filter.Filter
run runner
}
var defaultBinary = "/usr/sbin/unbound-control"
var defaultTimeout = internal.Duration{Duration: time.Second}
var sampleConfig = `
## If running as a restricted user you can prepend sudo for additional access:
#use_sudo = false
## The default location of the unbound-control binary can be overridden with:
binary = "/usr/sbin/unbound-control"
## The default timeout of 1s can be overriden with:
timeout = "1s"
## Use the builtin fielddrop/fieldpass telegraf filters in order to keep/remove specific fields
fieldpass = ["total_*", "num_*","time_up", "mem_*"]
## IP of server to connect to, read from unbound conf default, optionally ':port'
## Will lookup IP if given a hostname
server = "127.0.0.1:8953"
## Output thread related values in a separate measurement "unbound_threads", with additional tag
## "thread" identifying the thread number (0 ... the number of configured threads)
## By default, thread related metrics are output as additional fields in a single metric point
thread_as_tag = false
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`
// Description displays what this plugin is about
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func (s *Unbound) Description() string {
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return "A plugin to collect stats from Unbound - a validating, recursive, and caching DNS resolver"
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}
// SampleConfig displays configuration instructions
func (s *Unbound) SampleConfig() string {
return sampleConfig
}
// Shell out to unbound_stat and return the output
func unboundRunner(cmdName string, Timeout internal.Duration, UseSudo bool, Server string, ThreadAsTag bool) (*bytes.Buffer, error) {
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cmdArgs := []string{"stats_noreset"}
if Server != "" {
host, port, err := net.SplitHostPort(Server)
if err != nil { // No port was specified
host = Server
port = ""
}
// Unbound control requires an IP address, and we want to be nice to the user
resolver := net.Resolver{}
ctx, lookUpCancel := context.WithTimeout(context.Background(), Timeout.Duration)
defer lookUpCancel()
serverIps, err := resolver.LookupIPAddr(ctx, host)
if err != nil {
return nil, fmt.Errorf("error looking up ip for server: %s: %s", Server, err)
}
if len(serverIps) == 0 {
return nil, fmt.Errorf("error no ip for server: %s: %s", Server, err)
}
server := serverIps[0].IP.String()
if port != "" {
server = server + "@" + port
}
cmdArgs = append([]string{"-s", server}, cmdArgs...)
}
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cmd := exec.Command(cmdName, cmdArgs...)
if UseSudo {
cmdArgs = append([]string{cmdName}, cmdArgs...)
cmd = exec.Command("sudo", cmdArgs...)
}
var out bytes.Buffer
cmd.Stdout = &out
err := internal.RunTimeout(cmd, Timeout.Duration)
if err != nil {
return &out, fmt.Errorf("error running unbound-control: %s (%s %v)", err, cmdName, cmdArgs)
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}
return &out, nil
}
// Gather collects stats from unbound-control and adds them to the Accumulator
//
// All the dots in stat name will replaced by underscores. Histogram statistics will not be collected.
func (s *Unbound) Gather(acc telegraf.Accumulator) error {
// Always exclude histrogram statistics
statExcluded := []string{"histogram.*"}
filterExcluded, err := filter.Compile(statExcluded)
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if err != nil {
return err
}
out, err := s.run(s.Binary, s.Timeout, s.UseSudo, s.Server, s.ThreadAsTag)
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if err != nil {
return fmt.Errorf("error gathering metrics: %s", err)
}
// Process values
fields := make(map[string]interface{})
fieldsThreads := make(map[string]map[string]interface{})
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scanner := bufio.NewScanner(out)
for scanner.Scan() {
cols := strings.Split(scanner.Text(), "=")
// Check split correctness
if len(cols) != 2 {
continue
}
stat := cols[0]
value := cols[1]
// Filter value
if filterExcluded.Match(stat) {
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continue
}
fieldValue, err := strconv.ParseFloat(value, 64)
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if err != nil {
acc.AddError(fmt.Errorf("Expected a numerical value for %s = %v",
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stat, value))
continue
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}
// is this a thread related value?
if s.ThreadAsTag && strings.HasPrefix(stat, "thread") {
// split the stat
statTokens := strings.Split(stat, ".")
// make sure we split something
if len(statTokens) > 1 {
// set the thread identifier
threadID := strings.TrimPrefix(statTokens[0], "thread")
// make sure we have a proper thread ID
if _, err = strconv.Atoi(threadID); err == nil {
// create new slice without the thread identifier (skip first token)
threadTokens := statTokens[1:]
// re-define stat
field := strings.Join(threadTokens[:], "_")
if fieldsThreads[threadID] == nil {
fieldsThreads[threadID] = make(map[string]interface{})
}
fieldsThreads[threadID][field] = fieldValue
}
}
} else {
field := strings.Replace(stat, ".", "_", -1)
fields[field] = fieldValue
}
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}
acc.AddFields("unbound", fields, nil)
if s.ThreadAsTag && len(fieldsThreads) > 0 {
for thisThreadID, thisThreadFields := range fieldsThreads {
thisThreadTag := map[string]string{"thread": thisThreadID}
acc.AddFields("unbound_threads", thisThreadFields, thisThreadTag)
}
}
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return nil
}
func init() {
inputs.Add("unbound", func() telegraf.Input {
return &Unbound{
run: unboundRunner,
Binary: defaultBinary,
Timeout: defaultTimeout,
UseSudo: false,
Server: "",
ThreadAsTag: false,
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}
})
}