telegraf/plugins/inputs/statsd/statsd.go

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package statsd
import (
"bufio"
"bytes"
"errors"
"fmt"
"log"
"net"
"sort"
"strconv"
"strings"
"sync"
"time"
"github.com/influxdata/telegraf/plugins/parsers/graphite"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal"
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"github.com/influxdata/telegraf/plugins/inputs"
"github.com/influxdata/telegraf/selfstat"
)
const (
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// UDP packet limit, see
// https://en.wikipedia.org/wiki/User_Datagram_Protocol#Packet_structure
UDP_MAX_PACKET_SIZE int = 64 * 1024
defaultFieldName = "value"
defaultProtocol = "udp"
defaultSeparator = "_"
defaultAllowPendingMessage = 10000
MaxTCPConnections = 250
)
var dropwarn = "E! Error: statsd message queue full. " +
"We have dropped %d messages so far. " +
"You may want to increase allowed_pending_messages in the config\n"
var malformedwarn = "E! Statsd over TCP has received %d malformed packets" +
" thus far."
type Statsd struct {
// Protocol used on listener - udp or tcp
Protocol string `toml:"protocol"`
// Address & Port to serve from
ServiceAddress string
// Number of messages allowed to queue up in between calls to Gather. If this
// fills up, packets will get dropped until the next Gather interval is ran.
AllowedPendingMessages int
// Percentiles specifies the percentiles that will be calculated for timing
// and histogram stats.
Percentiles []int
PercentileLimit int
DeleteGauges bool
DeleteCounters bool
DeleteSets bool
DeleteTimings bool
ConvertNames bool
// MetricSeparator is the separator between parts of the metric name.
MetricSeparator string
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// This flag enables parsing of tags in the dogstatsd extension to the
// statsd protocol (http://docs.datadoghq.com/guides/dogstatsd/)
ParseDataDogTags bool
// UDPPacketSize is deprecated, it's only here for legacy support
// we now always create 1 max size buffer and then copy only what we need
// into the in channel
// see https://github.com/influxdata/telegraf/pull/992
UDPPacketSize int `toml:"udp_packet_size"`
ReadBufferSize int `toml:"read_buffer_size"`
sync.Mutex
// Lock for preventing a data race during resource cleanup
cleanup sync.Mutex
wg sync.WaitGroup
// accept channel tracks how many active connections there are, if there
// is an available bool in accept, then we are below the maximum and can
// accept the connection
accept chan bool
// drops tracks the number of dropped metrics.
drops int
// malformed tracks the number of malformed packets
malformed int
// Channel for all incoming statsd packets
in chan *bytes.Buffer
done chan struct{}
// Cache gauges, counters & sets so they can be aggregated as they arrive
// gauges and counters map measurement/tags hash -> field name -> metrics
// sets and timings map measurement/tags hash -> metrics
gauges map[string]cachedgauge
counters map[string]cachedcounter
sets map[string]cachedset
timings map[string]cachedtimings
// bucket -> influx templates
Templates []string
// Protocol listeners
UDPlistener *net.UDPConn
TCPlistener *net.TCPListener
// track current connections so we can close them in Stop()
conns map[string]*net.TCPConn
MaxTCPConnections int `toml:"max_tcp_connections"`
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TCPKeepAlive bool `toml:"tcp_keep_alive"`
TCPKeepAlivePeriod *internal.Duration `toml:"tcp_keep_alive_period"`
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graphiteParser *graphite.GraphiteParser
acc telegraf.Accumulator
MaxConnections selfstat.Stat
CurrentConnections selfstat.Stat
TotalConnections selfstat.Stat
PacketsRecv selfstat.Stat
BytesRecv selfstat.Stat
// A pool of byte slices to handle parsing
bufPool sync.Pool
}
// One statsd metric, form is <bucket>:<value>|<mtype>|@<samplerate>
type metric struct {
name string
field string
bucket string
hash string
intvalue int64
floatvalue float64
strvalue string
mtype string
additive bool
samplerate float64
tags map[string]string
}
type cachedset struct {
name string
fields map[string]map[string]bool
tags map[string]string
}
type cachedgauge struct {
name string
fields map[string]interface{}
tags map[string]string
}
type cachedcounter struct {
name string
fields map[string]interface{}
tags map[string]string
}
type cachedtimings struct {
name string
fields map[string]RunningStats
tags map[string]string
}
func (_ *Statsd) Description() string {
return "Statsd UDP/TCP Server"
}
const sampleConfig = `
## Protocol, must be "tcp", "udp", "udp4" or "udp6" (default=udp)
protocol = "udp"
## MaxTCPConnection - applicable when protocol is set to tcp (default=250)
max_tcp_connections = 250
## Enable TCP keep alive probes (default=false)
tcp_keep_alive = false
## Specifies the keep-alive period for an active network connection.
## Only applies to TCP sockets and will be ignored if tcp_keep_alive is false.
## Defaults to the OS configuration.
# tcp_keep_alive_period = "2h"
## Address and port to host UDP listener on
service_address = ":8125"
## The following configuration options control when telegraf clears it's cache
## of previous values. If set to false, then telegraf will only clear it's
## cache when the daemon is restarted.
## Reset gauges every interval (default=true)
delete_gauges = true
## Reset counters every interval (default=true)
delete_counters = true
## Reset sets every interval (default=true)
delete_sets = true
## Reset timings & histograms every interval (default=true)
delete_timings = true
## Percentiles to calculate for timing & histogram stats
percentiles = [90]
## separator to use between elements of a statsd metric
metric_separator = "_"
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## Parses tags in the datadog statsd format
## http://docs.datadoghq.com/guides/dogstatsd/
parse_data_dog_tags = false
## Statsd data translation templates, more info can be read here:
## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md#graphite
# templates = [
# "cpu.* measurement*"
# ]
## Number of UDP messages allowed to queue up, once filled,
## the statsd server will start dropping packets
allowed_pending_messages = 10000
## Number of timing/histogram values to track per-measurement in the
## calculation of percentiles. Raising this limit increases the accuracy
## of percentiles but also increases the memory usage and cpu time.
percentile_limit = 1000
`
func (_ *Statsd) SampleConfig() string {
return sampleConfig
}
func (s *Statsd) Gather(acc telegraf.Accumulator) error {
s.Lock()
defer s.Unlock()
now := time.Now()
for _, metric := range s.timings {
// Defining a template to parse field names for timers allows us to split
// out multiple fields per timer. In this case we prefix each stat with the
// field name and store these all in a single measurement.
fields := make(map[string]interface{})
for fieldName, stats := range metric.fields {
var prefix string
if fieldName != defaultFieldName {
prefix = fieldName + "_"
}
fields[prefix+"mean"] = stats.Mean()
fields[prefix+"stddev"] = stats.Stddev()
fields[prefix+"sum"] = stats.Sum()
fields[prefix+"upper"] = stats.Upper()
fields[prefix+"lower"] = stats.Lower()
fields[prefix+"count"] = stats.Count()
for _, percentile := range s.Percentiles {
name := fmt.Sprintf("%s%v_percentile", prefix, percentile)
fields[name] = stats.Percentile(percentile)
}
}
acc.AddFields(metric.name, fields, metric.tags, now)
}
if s.DeleteTimings {
s.timings = make(map[string]cachedtimings)
}
for _, metric := range s.gauges {
acc.AddGauge(metric.name, metric.fields, metric.tags, now)
}
if s.DeleteGauges {
s.gauges = make(map[string]cachedgauge)
}
for _, metric := range s.counters {
acc.AddCounter(metric.name, metric.fields, metric.tags, now)
}
if s.DeleteCounters {
s.counters = make(map[string]cachedcounter)
}
for _, metric := range s.sets {
fields := make(map[string]interface{})
for field, set := range metric.fields {
fields[field] = int64(len(set))
}
acc.AddFields(metric.name, fields, metric.tags, now)
}
if s.DeleteSets {
s.sets = make(map[string]cachedset)
}
return nil
}
func (s *Statsd) Start(_ telegraf.Accumulator) error {
// Make data structures
s.gauges = make(map[string]cachedgauge)
s.counters = make(map[string]cachedcounter)
s.sets = make(map[string]cachedset)
s.timings = make(map[string]cachedtimings)
s.Lock()
defer s.Unlock()
//
tags := map[string]string{
"address": s.ServiceAddress,
}
s.MaxConnections = selfstat.Register("statsd", "tcp_max_connections", tags)
s.MaxConnections.Set(int64(s.MaxTCPConnections))
s.CurrentConnections = selfstat.Register("statsd", "tcp_current_connections", tags)
s.TotalConnections = selfstat.Register("statsd", "tcp_total_connections", tags)
s.PacketsRecv = selfstat.Register("statsd", "tcp_packets_received", tags)
s.BytesRecv = selfstat.Register("statsd", "tcp_bytes_received", tags)
s.in = make(chan *bytes.Buffer, s.AllowedPendingMessages)
s.done = make(chan struct{})
s.accept = make(chan bool, s.MaxTCPConnections)
s.conns = make(map[string]*net.TCPConn)
s.bufPool = sync.Pool{
New: func() interface{} {
return new(bytes.Buffer)
},
}
for i := 0; i < s.MaxTCPConnections; i++ {
s.accept <- true
}
if s.ConvertNames {
log.Printf("I! WARNING statsd: convert_names config option is deprecated," +
" please use metric_separator instead")
}
if s.MetricSeparator == "" {
s.MetricSeparator = defaultSeparator
}
s.wg.Add(2)
// Start the UDP listener
if s.isUDP() {
go s.udpListen()
} else {
go s.tcpListen()
}
// Start the line parser
go s.parser()
log.Printf("I! Started the statsd service on %s\n", s.ServiceAddress)
return nil
}
// tcpListen() starts listening for udp packets on the configured port.
func (s *Statsd) tcpListen() error {
defer s.wg.Done()
// Start listener
var err error
address, _ := net.ResolveTCPAddr("tcp", s.ServiceAddress)
s.TCPlistener, err = net.ListenTCP("tcp", address)
if err != nil {
log.Fatalf("ERROR: ListenTCP - %s", err)
return err
}
log.Println("I! TCP Statsd listening on: ", s.TCPlistener.Addr().String())
for {
select {
case <-s.done:
return nil
default:
// Accept connection:
conn, err := s.TCPlistener.AcceptTCP()
if err != nil {
return err
}
if s.TCPKeepAlive {
if err = conn.SetKeepAlive(true); err != nil {
return err
}
if s.TCPKeepAlivePeriod != nil {
if err = conn.SetKeepAlivePeriod(s.TCPKeepAlivePeriod.Duration); err != nil {
return err
}
}
}
select {
case <-s.accept:
// not over connection limit, handle the connection properly.
s.wg.Add(1)
// generate a random id for this TCPConn
id := internal.RandomString(6)
s.remember(id, conn)
go s.handler(conn, id)
default:
// We are over the connection limit, refuse & close.
s.refuser(conn)
}
}
}
}
// udpListen starts listening for udp packets on the configured port.
func (s *Statsd) udpListen() error {
defer s.wg.Done()
var err error
address, _ := net.ResolveUDPAddr(s.Protocol, s.ServiceAddress)
s.UDPlistener, err = net.ListenUDP(s.Protocol, address)
if err != nil {
log.Fatalf("ERROR: ListenUDP - %s", err)
}
log.Println("I! Statsd UDP listener listening on: ", s.UDPlistener.LocalAddr().String())
if s.ReadBufferSize > 0 {
s.UDPlistener.SetReadBuffer(s.ReadBufferSize)
}
buf := make([]byte, UDP_MAX_PACKET_SIZE)
for {
select {
case <-s.done:
return nil
default:
n, _, err := s.UDPlistener.ReadFromUDP(buf)
if err != nil && !strings.Contains(err.Error(), "closed network") {
log.Printf("E! Error READ: %s\n", err.Error())
continue
}
b := s.bufPool.Get().(*bytes.Buffer)
b.Reset()
b.Write(buf[:n])
select {
case s.in <- b:
default:
s.drops++
if s.drops == 1 || s.AllowedPendingMessages == 0 || s.drops%s.AllowedPendingMessages == 0 {
log.Printf(dropwarn, s.drops)
}
}
}
}
}
// parser monitors the s.in channel, if there is a packet ready, it parses the
// packet into statsd strings and then calls parseStatsdLine, which parses a
// single statsd metric into a struct.
func (s *Statsd) parser() error {
defer s.wg.Done()
for {
select {
case <-s.done:
return nil
case buf := <-s.in:
lines := strings.Split(buf.String(), "\n")
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s.bufPool.Put(buf)
for _, line := range lines {
line = strings.TrimSpace(line)
if line != "" {
s.parseStatsdLine(line)
}
}
}
}
}
// parseStatsdLine will parse the given statsd line, validating it as it goes.
// If the line is valid, it will be cached for the next call to Gather()
func (s *Statsd) parseStatsdLine(line string) error {
s.Lock()
defer s.Unlock()
lineTags := make(map[string]string)
if s.ParseDataDogTags {
recombinedSegments := make([]string, 0)
// datadog tags look like this:
// users.online:1|c|@0.5|#country:china,environment:production
// users.online:1|c|#sometagwithnovalue
// we will split on the pipe and remove any elements that are datadog
// tags, parse them, and rebuild the line sans the datadog tags
pipesplit := strings.Split(line, "|")
for _, segment := range pipesplit {
if len(segment) > 0 && segment[0] == '#' {
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// we have ourselves a tag; they are comma separated
tagstr := segment[1:]
tags := strings.Split(tagstr, ",")
for _, tag := range tags {
ts := strings.SplitN(tag, ":", 2)
var k, v string
switch len(ts) {
case 1:
// just a tag
k = ts[0]
v = ""
case 2:
k = ts[0]
v = ts[1]
}
if k != "" {
lineTags[k] = v
}
}
} else {
recombinedSegments = append(recombinedSegments, segment)
}
}
line = strings.Join(recombinedSegments, "|")
}
// Validate splitting the line on ":"
bits := strings.Split(line, ":")
if len(bits) < 2 {
log.Printf("E! Error: splitting ':', Unable to parse metric: %s\n", line)
return errors.New("Error Parsing statsd line")
}
// Extract bucket name from individual metric bits
bucketName, bits := bits[0], bits[1:]
// Add a metric for each bit available
for _, bit := range bits {
m := metric{}
m.bucket = bucketName
// Validate splitting the bit on "|"
pipesplit := strings.Split(bit, "|")
if len(pipesplit) < 2 {
log.Printf("E! Error: splitting '|', Unable to parse metric: %s\n", line)
return errors.New("Error Parsing statsd line")
} else if len(pipesplit) > 2 {
sr := pipesplit[2]
errmsg := "E! Error: parsing sample rate, %s, it must be in format like: " +
"@0.1, @0.5, etc. Ignoring sample rate for line: %s\n"
if strings.Contains(sr, "@") && len(sr) > 1 {
samplerate, err := strconv.ParseFloat(sr[1:], 64)
if err != nil {
log.Printf(errmsg, err.Error(), line)
} else {
// sample rate successfully parsed
m.samplerate = samplerate
}
} else {
log.Printf(errmsg, "", line)
}
}
// Validate metric type
switch pipesplit[1] {
case "g", "c", "s", "ms", "h":
m.mtype = pipesplit[1]
default:
log.Printf("E! Error: Statsd Metric type %s unsupported", pipesplit[1])
return errors.New("Error Parsing statsd line")
}
// Parse the value
if strings.HasPrefix(pipesplit[0], "-") || strings.HasPrefix(pipesplit[0], "+") {
if m.mtype != "g" && m.mtype != "c" {
log.Printf("E! Error: +- values are only supported for gauges & counters: %s\n", line)
return errors.New("Error Parsing statsd line")
}
m.additive = true
}
switch m.mtype {
case "g", "ms", "h":
v, err := strconv.ParseFloat(pipesplit[0], 64)
if err != nil {
log.Printf("E! Error: parsing value to float64: %s\n", line)
return errors.New("Error Parsing statsd line")
}
m.floatvalue = v
case "c":
var v int64
v, err := strconv.ParseInt(pipesplit[0], 10, 64)
if err != nil {
v2, err2 := strconv.ParseFloat(pipesplit[0], 64)
if err2 != nil {
log.Printf("E! Error: parsing value to int64: %s\n", line)
return errors.New("Error Parsing statsd line")
}
v = int64(v2)
}
// If a sample rate is given with a counter, divide value by the rate
if m.samplerate != 0 && m.mtype == "c" {
v = int64(float64(v) / m.samplerate)
}
m.intvalue = v
case "s":
m.strvalue = pipesplit[0]
}
// Parse the name & tags from bucket
m.name, m.field, m.tags = s.parseName(m.bucket)
switch m.mtype {
case "c":
m.tags["metric_type"] = "counter"
case "g":
m.tags["metric_type"] = "gauge"
case "s":
m.tags["metric_type"] = "set"
case "ms":
m.tags["metric_type"] = "timing"
case "h":
m.tags["metric_type"] = "histogram"
}
if len(lineTags) > 0 {
for k, v := range lineTags {
m.tags[k] = v
}
}
// Make a unique key for the measurement name/tags
var tg []string
for k, v := range m.tags {
tg = append(tg, k+"="+v)
}
sort.Strings(tg)
tg = append(tg, m.name)
m.hash = strings.Join(tg, "")
s.aggregate(m)
}
return nil
}
// parseName parses the given bucket name with the list of bucket maps in the
// config file. If there is a match, it will parse the name of the metric and
// map of tags.
// Return values are (<name>, <field>, <tags>)
func (s *Statsd) parseName(bucket string) (string, string, map[string]string) {
tags := make(map[string]string)
bucketparts := strings.Split(bucket, ",")
// Parse out any tags in the bucket
if len(bucketparts) > 1 {
for _, btag := range bucketparts[1:] {
k, v := parseKeyValue(btag)
if k != "" {
tags[k] = v
}
}
}
var field string
name := bucketparts[0]
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p := s.graphiteParser
var err error
if p == nil || s.graphiteParser.Separator != s.MetricSeparator {
p, err = graphite.NewGraphiteParser(s.MetricSeparator, s.Templates, nil)
s.graphiteParser = p
}
if err == nil {
p.DefaultTags = tags
name, tags, field, _ = p.ApplyTemplate(name)
}
if s.ConvertNames {
name = strings.Replace(name, ".", "_", -1)
name = strings.Replace(name, "-", "__", -1)
}
if field == "" {
field = defaultFieldName
}
return name, field, tags
}
// Parse the key,value out of a string that looks like "key=value"
func parseKeyValue(keyvalue string) (string, string) {
var key, val string
split := strings.Split(keyvalue, "=")
// Must be exactly 2 to get anything meaningful out of them
if len(split) == 2 {
key = split[0]
val = split[1]
} else if len(split) == 1 {
val = split[0]
}
return key, val
}
// aggregate takes in a metric. It then
// aggregates and caches the current value(s). It does not deal with the
// Delete* options, because those are dealt with in the Gather function.
func (s *Statsd) aggregate(m metric) {
switch m.mtype {
case "ms", "h":
// Check if the measurement exists
cached, ok := s.timings[m.hash]
if !ok {
cached = cachedtimings{
name: m.name,
fields: make(map[string]RunningStats),
tags: m.tags,
}
}
// Check if the field exists. If we've not enabled multiple fields per timer
// this will be the default field name, eg. "value"
field, ok := cached.fields[m.field]
if !ok {
field = RunningStats{
PercLimit: s.PercentileLimit,
}
}
if m.samplerate > 0 {
for i := 0; i < int(1.0/m.samplerate); i++ {
field.AddValue(m.floatvalue)
}
} else {
field.AddValue(m.floatvalue)
}
cached.fields[m.field] = field
s.timings[m.hash] = cached
case "c":
// check if the measurement exists
_, ok := s.counters[m.hash]
if !ok {
s.counters[m.hash] = cachedcounter{
name: m.name,
fields: make(map[string]interface{}),
tags: m.tags,
}
}
// check if the field exists
_, ok = s.counters[m.hash].fields[m.field]
if !ok {
s.counters[m.hash].fields[m.field] = int64(0)
}
s.counters[m.hash].fields[m.field] =
s.counters[m.hash].fields[m.field].(int64) + m.intvalue
case "g":
// check if the measurement exists
_, ok := s.gauges[m.hash]
if !ok {
s.gauges[m.hash] = cachedgauge{
name: m.name,
fields: make(map[string]interface{}),
tags: m.tags,
}
}
// check if the field exists
_, ok = s.gauges[m.hash].fields[m.field]
if !ok {
s.gauges[m.hash].fields[m.field] = float64(0)
}
if m.additive {
s.gauges[m.hash].fields[m.field] =
s.gauges[m.hash].fields[m.field].(float64) + m.floatvalue
} else {
s.gauges[m.hash].fields[m.field] = m.floatvalue
}
case "s":
// check if the measurement exists
_, ok := s.sets[m.hash]
if !ok {
s.sets[m.hash] = cachedset{
name: m.name,
fields: make(map[string]map[string]bool),
tags: m.tags,
}
}
// check if the field exists
_, ok = s.sets[m.hash].fields[m.field]
if !ok {
s.sets[m.hash].fields[m.field] = make(map[string]bool)
}
s.sets[m.hash].fields[m.field][m.strvalue] = true
}
}
// handler handles a single TCP Connection
func (s *Statsd) handler(conn *net.TCPConn, id string) {
s.CurrentConnections.Incr(1)
s.TotalConnections.Incr(1)
// connection cleanup function
defer func() {
s.wg.Done()
conn.Close()
// Add one connection potential back to channel when this one closes
s.accept <- true
s.forget(id)
s.CurrentConnections.Incr(-1)
}()
var n int
scanner := bufio.NewScanner(conn)
for {
select {
case <-s.done:
return
default:
if !scanner.Scan() {
return
}
n = len(scanner.Bytes())
if n == 0 {
continue
}
s.BytesRecv.Incr(int64(n))
s.PacketsRecv.Incr(1)
b := s.bufPool.Get().(*bytes.Buffer)
b.Reset()
b.Write(scanner.Bytes())
b.WriteByte('\n')
select {
case s.in <- b:
default:
s.drops++
if s.drops == 1 || s.drops%s.AllowedPendingMessages == 0 {
log.Printf(dropwarn, s.drops)
}
}
}
}
}
// refuser refuses a TCP connection
func (s *Statsd) refuser(conn *net.TCPConn) {
conn.Close()
log.Printf("I! Refused TCP Connection from %s", conn.RemoteAddr())
log.Printf("I! WARNING: Maximum TCP Connections reached, you may want to" +
" adjust max_tcp_connections")
}
// forget a TCP connection
func (s *Statsd) forget(id string) {
s.cleanup.Lock()
defer s.cleanup.Unlock()
delete(s.conns, id)
}
// remember a TCP connection
func (s *Statsd) remember(id string, conn *net.TCPConn) {
s.cleanup.Lock()
defer s.cleanup.Unlock()
s.conns[id] = conn
}
func (s *Statsd) Stop() {
s.Lock()
log.Println("I! Stopping the statsd service")
close(s.done)
if s.isUDP() {
s.UDPlistener.Close()
} else {
s.TCPlistener.Close()
// Close all open TCP connections
// - get all conns from the s.conns map and put into slice
// - this is so the forget() function doesnt conflict with looping
// over the s.conns map
var conns []*net.TCPConn
s.cleanup.Lock()
for _, conn := range s.conns {
conns = append(conns, conn)
}
s.cleanup.Unlock()
for _, conn := range conns {
conn.Close()
}
}
s.Unlock()
s.wg.Wait()
s.Lock()
close(s.in)
log.Println("I! Stopped Statsd listener service on ", s.ServiceAddress)
s.Unlock()
}
// IsUDP returns true if the protocol is UDP, false otherwise.
func (s *Statsd) isUDP() bool {
return strings.HasPrefix(s.Protocol, "udp")
}
func init() {
inputs.Add("statsd", func() telegraf.Input {
return &Statsd{
Protocol: defaultProtocol,
ServiceAddress: ":8125",
MaxTCPConnections: 250,
TCPKeepAlive: false,
MetricSeparator: "_",
AllowedPendingMessages: defaultAllowPendingMessage,
DeleteCounters: true,
DeleteGauges: true,
DeleteSets: true,
DeleteTimings: true,
}
})
}