/usr/share/gocode/src/github.com/influxdata/influxdb/services/collectd/service.go is in golang-github-influxdb-influxdb-dev 1.1.1+dfsg1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"fmt"
"io"
"io/ioutil"
"log"
"net"
"os"
"path/filepath"
"sync"
"sync/atomic"
"time"
"github.com/influxdata/influxdb/models"
"github.com/influxdata/influxdb/services/meta"
"github.com/influxdata/influxdb/tsdb"
"github.com/kimor79/gollectd"
)
// statistics gathered by the collectd service.
const (
statPointsReceived = "pointsRx"
statBytesReceived = "bytesRx"
statPointsParseFail = "pointsParseFail"
statReadFail = "readFail"
statBatchesTransmitted = "batchesTx"
statPointsTransmitted = "pointsTx"
statBatchesTransmitFail = "batchesTxFail"
statDroppedPointsInvalid = "droppedPointsInvalid"
)
// pointsWriter is an internal interface to make testing easier.
type pointsWriter interface {
WritePoints(database, retentionPolicy string, consistencyLevel models.ConsistencyLevel, points []models.Point) error
}
// metaStore is an internal interface to make testing easier.
type metaClient interface {
CreateDatabase(name string) (*meta.DatabaseInfo, error)
}
// Service represents a UDP server which receives metrics in collectd's binary
// protocol and stores them in InfluxDB.
type Service struct {
Config *Config
MetaClient metaClient
PointsWriter pointsWriter
Logger *log.Logger
wg sync.WaitGroup
conn *net.UDPConn
batcher *tsdb.PointBatcher
typesdb gollectd.Types
addr net.Addr
mu sync.RWMutex
ready bool // Has the required database been created?
done chan struct{} // Is the service closing or closed?
// expvar-based stats.
stats *Statistics
defaultTags models.StatisticTags
}
// NewService returns a new instance of the collectd service.
func NewService(c Config) *Service {
s := Service{
// Use defaults where necessary.
Config: c.WithDefaults(),
Logger: log.New(os.Stderr, "[collectd] ", log.LstdFlags),
stats: &Statistics{},
defaultTags: models.StatisticTags{"bind": c.BindAddress},
}
return &s
}
// Open starts the service.
func (s *Service) Open() error {
s.mu.Lock()
defer s.mu.Unlock()
if !s.closed() {
return nil // Already open.
}
s.done = make(chan struct{})
s.Logger.Printf("Starting collectd service")
if s.Config.BindAddress == "" {
return fmt.Errorf("bind address is blank")
} else if s.Config.Database == "" {
return fmt.Errorf("database name is blank")
} else if s.PointsWriter == nil {
return fmt.Errorf("PointsWriter is nil")
}
if s.typesdb == nil {
// Open collectd types.
if stat, err := os.Stat(s.Config.TypesDB); err != nil {
return fmt.Errorf("Stat(): %s", err)
} else if stat.IsDir() {
alltypesdb := make(gollectd.Types)
var readdir func(path string)
readdir = func(path string) {
files, err := ioutil.ReadDir(path)
if err != nil {
s.Logger.Printf("Unable to read directory %s: %s\n", path, err)
return
}
for _, f := range files {
fullpath := filepath.Join(path, f.Name())
if f.IsDir() {
readdir(fullpath)
continue
}
s.Logger.Printf("Loading %s\n", fullpath)
types, err := gollectd.TypesDBFile(fullpath)
if err != nil {
s.Logger.Printf("Unable to parse collectd types file: %s\n", f.Name())
continue
}
for k, t := range types {
a, ok := alltypesdb[k]
if ok {
alltypesdb[k] = t
} else {
alltypesdb[k] = append(a, t...)
}
}
}
}
readdir(s.Config.TypesDB)
s.typesdb = alltypesdb
} else {
s.Logger.Printf("Loading %s\n", s.Config.TypesDB)
typesdb, err := gollectd.TypesDBFile(s.Config.TypesDB)
if err != nil {
return fmt.Errorf("Open(): %s", err)
}
s.typesdb = typesdb
}
}
// Resolve our address.
addr, err := net.ResolveUDPAddr("udp", s.Config.BindAddress)
if err != nil {
return fmt.Errorf("unable to resolve UDP address: %s", err)
}
s.addr = addr
// Start listening
conn, err := net.ListenUDP("udp", addr)
if err != nil {
return fmt.Errorf("unable to listen on UDP: %s", err)
}
if s.Config.ReadBuffer != 0 {
err = conn.SetReadBuffer(s.Config.ReadBuffer)
if err != nil {
return fmt.Errorf("unable to set UDP read buffer to %d: %s",
s.Config.ReadBuffer, err)
}
}
s.conn = conn
s.Logger.Println("Listening on UDP: ", conn.LocalAddr().String())
// Start the points batcher.
s.batcher = tsdb.NewPointBatcher(s.Config.BatchSize, s.Config.BatchPending, time.Duration(s.Config.BatchDuration))
s.batcher.Start()
// Create waitgroup for signalling goroutines to stop and start goroutines
// that process collectd packets.
s.wg.Add(2)
go func() { defer s.wg.Done(); s.serve() }()
go func() { defer s.wg.Done(); s.writePoints() }()
return nil
}
// Close stops the service.
func (s *Service) Close() error {
s.mu.Lock()
defer s.mu.Unlock()
if s.closed() {
return nil // Already closed.
}
close(s.done)
// Close the connection, and wait for the goroutine to exit.
if s.conn != nil {
s.conn.Close()
}
if s.batcher != nil {
s.batcher.Stop()
}
s.wg.Wait()
// Release all remaining resources.
s.conn = nil
s.batcher = nil
s.Logger.Println("collectd UDP closed")
s.done = nil
return nil
}
func (s *Service) closed() bool {
select {
case <-s.done:
// Service is closing.
return true
default:
}
return s.done == nil
}
// createInternalStorage ensures that the required database has been created.
func (s *Service) createInternalStorage() error {
s.mu.RLock()
ready := s.ready
s.mu.RUnlock()
if ready {
return nil
}
if _, err := s.MetaClient.CreateDatabase(s.Config.Database); err != nil {
return err
}
// The service is now ready.
s.mu.Lock()
s.ready = true
s.mu.Unlock()
return nil
}
// SetLogOutput sets the writer to which all logs are written. It must not be
// called after Open is called.
func (s *Service) SetLogOutput(w io.Writer) {
s.Logger = log.New(w, "[collectd] ", log.LstdFlags)
}
// Statistics maintains statistics for the collectd service.
type Statistics struct {
PointsReceived int64
BytesReceived int64
PointsParseFail int64
ReadFail int64
BatchesTransmitted int64
PointsTransmitted int64
BatchesTransmitFail int64
InvalidDroppedPoints int64
}
// Statistics returns statistics for periodic monitoring.
func (s *Service) Statistics(tags map[string]string) []models.Statistic {
return []models.Statistic{{
Name: "collectd",
Tags: s.defaultTags.Merge(tags),
Values: map[string]interface{}{
statPointsReceived: atomic.LoadInt64(&s.stats.PointsReceived),
statBytesReceived: atomic.LoadInt64(&s.stats.BytesReceived),
statPointsParseFail: atomic.LoadInt64(&s.stats.PointsParseFail),
statReadFail: atomic.LoadInt64(&s.stats.ReadFail),
statBatchesTransmitted: atomic.LoadInt64(&s.stats.BatchesTransmitted),
statPointsTransmitted: atomic.LoadInt64(&s.stats.PointsTransmitted),
statBatchesTransmitFail: atomic.LoadInt64(&s.stats.BatchesTransmitFail),
statDroppedPointsInvalid: atomic.LoadInt64(&s.stats.InvalidDroppedPoints),
},
}}
}
// SetTypes sets collectd types db.
func (s *Service) SetTypes(types string) (err error) {
s.typesdb, err = gollectd.TypesDB([]byte(types))
return
}
// Addr returns the listener's address. Returns nil if listener is closed.
func (s *Service) Addr() net.Addr {
return s.conn.LocalAddr()
}
func (s *Service) serve() {
// From https://collectd.org/wiki/index.php/Binary_protocol
// 1024 bytes (payload only, not including UDP / IP headers)
// In versions 4.0 through 4.7, the receive buffer has a fixed size
// of 1024 bytes. When longer packets are received, the trailing data
// is simply ignored. Since version 4.8, the buffer size can be
// configured. Version 5.0 will increase the default buffer size to
// 1452 bytes (the maximum payload size when using UDP/IPv6 over
// Ethernet).
buffer := make([]byte, 1452)
for {
select {
case <-s.done:
// We closed the connection, time to go.
return
default:
// Keep processing.
}
n, _, err := s.conn.ReadFromUDP(buffer)
if err != nil {
atomic.AddInt64(&s.stats.ReadFail, 1)
s.Logger.Printf("collectd ReadFromUDP error: %s", err)
continue
}
if n > 0 {
atomic.AddInt64(&s.stats.BytesReceived, int64(n))
s.handleMessage(buffer[:n])
}
}
}
func (s *Service) handleMessage(buffer []byte) {
packets, err := gollectd.Packets(buffer, s.typesdb)
if err != nil {
atomic.AddInt64(&s.stats.PointsParseFail, 1)
s.Logger.Printf("Collectd parse error: %s", err)
return
}
for _, packet := range *packets {
points := s.UnmarshalCollectd(&packet)
for _, p := range points {
s.batcher.In() <- p
}
atomic.AddInt64(&s.stats.PointsReceived, int64(len(points)))
}
}
func (s *Service) writePoints() {
for {
select {
case <-s.done:
return
case batch := <-s.batcher.Out():
// Will attempt to create database if not yet created.
if err := s.createInternalStorage(); err != nil {
s.Logger.Printf("Required database %s not yet created: %s", s.Config.Database, err.Error())
continue
}
if err := s.PointsWriter.WritePoints(s.Config.Database, s.Config.RetentionPolicy, models.ConsistencyLevelAny, batch); err == nil {
atomic.AddInt64(&s.stats.BatchesTransmitted, 1)
atomic.AddInt64(&s.stats.PointsTransmitted, int64(len(batch)))
} else {
s.Logger.Printf("failed to write point batch to database %q: %s", s.Config.Database, err)
atomic.AddInt64(&s.stats.BatchesTransmitFail, 1)
}
}
}
}
// Unmarshal translates a collectd packet into InfluxDB data points.
func (s *Service) UnmarshalCollectd(packet *gollectd.Packet) []models.Point {
// Prefer high resolution timestamp.
var timestamp time.Time
if packet.TimeHR > 0 {
// TimeHR is "near" nanosecond measurement, but not exactly nanasecond time
// Since we store time in microseconds, we round here (mostly so tests will work easier)
sec := packet.TimeHR >> 30
// Shifting, masking, and dividing by 1 billion to get nanoseconds.
nsec := ((packet.TimeHR & 0x3FFFFFFF) << 30) / 1000 / 1000 / 1000
timestamp = time.Unix(int64(sec), int64(nsec)).UTC().Round(time.Microsecond)
} else {
// If we don't have high resolution time, fall back to basic unix time
timestamp = time.Unix(int64(packet.Time), 0).UTC()
}
var points []models.Point
for i := range packet.Values {
name := fmt.Sprintf("%s_%s", packet.Plugin, packet.Values[i].Name)
tags := make(map[string]string)
fields := make(map[string]interface{})
fields["value"] = packet.Values[i].Value
if packet.Hostname != "" {
tags["host"] = packet.Hostname
}
if packet.PluginInstance != "" {
tags["instance"] = packet.PluginInstance
}
if packet.Type != "" {
tags["type"] = packet.Type
}
if packet.TypeInstance != "" {
tags["type_instance"] = packet.TypeInstance
}
// Drop invalid points
p, err := models.NewPoint(name, models.NewTags(tags), fields, timestamp)
if err != nil {
s.Logger.Printf("Dropping point %v: %v", name, err)
atomic.AddInt64(&s.stats.InvalidDroppedPoints, 1)
continue
}
points = append(points, p)
}
return points
}
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