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service.go
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service.go
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// Package graphite provides a service for InfluxDB to ingest data via the graphite protocol.
package graphite // import "github.com/influxdata/influxdb/services/graphite"
import (
"bufio"
"fmt"
"math"
"net"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/influxdata/influxdb/models"
"github.com/influxdata/influxdb/monitor/diagnostics"
"github.com/influxdata/influxdb/services/meta"
"github.com/influxdata/influxdb/tsdb"
"github.com/uber-go/zap"
)
const udpBufferSize = 65536
// statistics gathered by the graphite package.
const (
statPointsReceived = "pointsRx"
statBytesReceived = "bytesRx"
statPointsParseFail = "pointsParseFail"
statPointsNaNFail = "pointsNaNFail"
statBatchesTransmitted = "batchesTx"
statPointsTransmitted = "pointsTx"
statBatchesTransmitFail = "batchesTxFail"
statConnectionsActive = "connsActive"
statConnectionsHandled = "connsHandled"
)
type tcpConnection struct {
conn net.Conn
connectTime time.Time
}
func (c *tcpConnection) Close() {
c.conn.Close()
}
// Service represents a Graphite service.
type Service struct {
bindAddress string
database string
retentionPolicy string
protocol string
batchSize int
batchPending int
batchTimeout time.Duration
udpReadBuffer int
batcher *tsdb.PointBatcher
parser *Parser
logger zap.Logger
stats *Statistics
defaultTags models.StatisticTags
tcpConnectionsMu sync.Mutex
tcpConnections map[string]*tcpConnection
diagsKey string
ln net.Listener
addr net.Addr
udpConn *net.UDPConn
wg sync.WaitGroup
mu sync.RWMutex
ready bool // Has the required database been created?
done chan struct{} // Is the service closing or closed?
Monitor interface {
RegisterDiagnosticsClient(name string, client diagnostics.Client)
DeregisterDiagnosticsClient(name string)
}
PointsWriter interface {
WritePoints(database, retentionPolicy string, consistencyLevel models.ConsistencyLevel, points []models.Point) error
}
MetaClient interface {
CreateDatabase(name string) (*meta.DatabaseInfo, error)
CreateDatabaseWithRetentionPolicy(name string, spec *meta.RetentionPolicySpec) (*meta.DatabaseInfo, error)
CreateRetentionPolicy(database string, spec *meta.RetentionPolicySpec, makeDefault bool) (*meta.RetentionPolicyInfo, error)
Database(name string) *meta.DatabaseInfo
RetentionPolicy(database, name string) (*meta.RetentionPolicyInfo, error)
}
}
// NewService returns an instance of the Graphite service.
func NewService(c Config) (*Service, error) {
// Use defaults where necessary.
d := c.WithDefaults()
s := Service{
bindAddress: d.BindAddress,
database: d.Database,
retentionPolicy: d.RetentionPolicy,
protocol: d.Protocol,
batchSize: d.BatchSize,
batchPending: d.BatchPending,
udpReadBuffer: d.UDPReadBuffer,
batchTimeout: time.Duration(d.BatchTimeout),
logger: zap.New(zap.NullEncoder()),
stats: &Statistics{},
defaultTags: models.StatisticTags{"proto": d.Protocol, "bind": d.BindAddress},
tcpConnections: make(map[string]*tcpConnection),
diagsKey: strings.Join([]string{"graphite", d.Protocol, d.BindAddress}, ":"),
}
parser, err := NewParserWithOptions(Options{
Templates: d.Templates,
DefaultTags: d.DefaultTags(),
Separator: d.Separator})
if err != nil {
return nil, err
}
s.parser = parser
return &s, nil
}
// Open starts the Graphite input processing data.
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.Info(fmt.Sprintf("Starting graphite service, batch size %d, batch timeout %s", s.batchSize, s.batchTimeout))
// Register diagnostics if a Monitor service is available.
if s.Monitor != nil {
s.Monitor.RegisterDiagnosticsClient(s.diagsKey, s)
}
s.batcher = tsdb.NewPointBatcher(s.batchSize, s.batchPending, s.batchTimeout)
s.batcher.Start()
// Start processing batches.
s.wg.Add(1)
go s.processBatches(s.batcher)
var err error
if strings.ToLower(s.protocol) == "tcp" {
s.addr, err = s.openTCPServer()
} else if strings.ToLower(s.protocol) == "udp" {
s.addr, err = s.openUDPServer()
} else {
return fmt.Errorf("unrecognized Graphite input protocol %s", s.protocol)
}
if err != nil {
return err
}
s.logger.Info(fmt.Sprintf("Listening on %s: %s", strings.ToUpper(s.protocol), s.addr.String()))
return nil
}
func (s *Service) closeAllConnections() {
s.tcpConnectionsMu.Lock()
defer s.tcpConnectionsMu.Unlock()
for _, c := range s.tcpConnections {
c.Close()
}
}
// Close stops all data processing on the Graphite input.
func (s *Service) Close() error {
s.mu.Lock()
defer s.mu.Unlock()
if s.closed() {
return nil // Already closed.
}
close(s.done)
s.closeAllConnections()
if s.ln != nil {
s.ln.Close()
}
if s.udpConn != nil {
s.udpConn.Close()
}
if s.batcher != nil {
s.batcher.Stop()
}
if s.Monitor != nil {
s.Monitor.DeregisterDiagnosticsClient(s.diagsKey)
}
s.wg.Wait()
s.done = nil
return nil
}
// Closed returns true if the service is currently closed.
func (s *Service) Closed() bool {
s.mu.Lock()
defer s.mu.Unlock()
return s.closed()
}
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 db := s.MetaClient.Database(s.database); db != nil {
if rp, _ := s.MetaClient.RetentionPolicy(s.database, s.retentionPolicy); rp == nil {
spec := meta.RetentionPolicySpec{Name: s.retentionPolicy}
if _, err := s.MetaClient.CreateRetentionPolicy(s.database, &spec, true); err != nil {
return err
}
}
} else {
spec := meta.RetentionPolicySpec{Name: s.retentionPolicy}
if _, err := s.MetaClient.CreateDatabaseWithRetentionPolicy(s.database, &spec); err != nil {
return err
}
}
// The service is now ready.
s.mu.Lock()
s.ready = true
s.mu.Unlock()
return nil
}
// WithLogger sets the logger on the service.
func (s *Service) WithLogger(log zap.Logger) {
s.logger = log.With(
zap.String("service", "graphite"),
zap.String("addr", s.bindAddress),
)
}
// Statistics maintains statistics for the graphite service.
type Statistics struct {
PointsReceived int64
BytesReceived int64
PointsParseFail int64
PointsNaNFail int64
BatchesTransmitted int64
PointsTransmitted int64
BatchesTransmitFail int64
ActiveConnections int64
HandledConnections int64
}
// Statistics returns statistics for periodic monitoring.
func (s *Service) Statistics(tags map[string]string) []models.Statistic {
return []models.Statistic{{
Name: "graphite",
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),
statPointsNaNFail: atomic.LoadInt64(&s.stats.PointsNaNFail),
statBatchesTransmitted: atomic.LoadInt64(&s.stats.BatchesTransmitted),
statPointsTransmitted: atomic.LoadInt64(&s.stats.PointsTransmitted),
statBatchesTransmitFail: atomic.LoadInt64(&s.stats.BatchesTransmitFail),
statConnectionsActive: atomic.LoadInt64(&s.stats.ActiveConnections),
statConnectionsHandled: atomic.LoadInt64(&s.stats.HandledConnections),
},
}}
}
// Addr returns the address the Service binds to.
func (s *Service) Addr() net.Addr {
return s.addr
}
// openTCPServer opens the Graphite input in TCP mode and starts processing data.
func (s *Service) openTCPServer() (net.Addr, error) {
ln, err := net.Listen("tcp", s.bindAddress)
if err != nil {
return nil, err
}
s.ln = ln
s.wg.Add(1)
go func() {
defer s.wg.Done()
for {
conn, err := s.ln.Accept()
if opErr, ok := err.(*net.OpError); ok && !opErr.Temporary() {
s.logger.Info("graphite TCP listener closed")
return
}
if err != nil {
s.logger.Info("error accepting TCP connection", zap.Error(err))
continue
}
s.wg.Add(1)
go s.handleTCPConnection(conn)
}
}()
return ln.Addr(), nil
}
// handleTCPConnection services an individual TCP connection for the Graphite input.
func (s *Service) handleTCPConnection(conn net.Conn) {
defer s.wg.Done()
defer conn.Close()
defer atomic.AddInt64(&s.stats.ActiveConnections, -1)
defer s.untrackConnection(conn)
atomic.AddInt64(&s.stats.ActiveConnections, 1)
atomic.AddInt64(&s.stats.HandledConnections, 1)
s.trackConnection(conn)
reader := bufio.NewReader(conn)
for {
// Read up to the next newline.
buf, err := reader.ReadBytes('\n')
if err != nil {
return
}
// Trim the buffer, even though there should be no padding
line := strings.TrimSpace(string(buf))
atomic.AddInt64(&s.stats.PointsReceived, 1)
atomic.AddInt64(&s.stats.BytesReceived, int64(len(buf)))
s.handleLine(line)
}
}
func (s *Service) trackConnection(c net.Conn) {
s.tcpConnectionsMu.Lock()
defer s.tcpConnectionsMu.Unlock()
s.tcpConnections[c.RemoteAddr().String()] = &tcpConnection{
conn: c,
connectTime: time.Now().UTC(),
}
}
func (s *Service) untrackConnection(c net.Conn) {
s.tcpConnectionsMu.Lock()
defer s.tcpConnectionsMu.Unlock()
delete(s.tcpConnections, c.RemoteAddr().String())
}
// openUDPServer opens the Graphite input in UDP mode and starts processing incoming data.
func (s *Service) openUDPServer() (net.Addr, error) {
addr, err := net.ResolveUDPAddr("udp", s.bindAddress)
if err != nil {
return nil, err
}
s.udpConn, err = net.ListenUDP("udp", addr)
if err != nil {
return nil, err
}
if s.udpReadBuffer != 0 {
err = s.udpConn.SetReadBuffer(s.udpReadBuffer)
if err != nil {
return nil, fmt.Errorf("unable to set UDP read buffer to %d: %s",
s.udpReadBuffer, err)
}
}
buf := make([]byte, udpBufferSize)
s.wg.Add(1)
go func() {
defer s.wg.Done()
for {
n, _, err := s.udpConn.ReadFromUDP(buf)
if err != nil {
s.udpConn.Close()
return
}
lines := strings.Split(string(buf[:n]), "\n")
for _, line := range lines {
s.handleLine(line)
}
atomic.AddInt64(&s.stats.PointsReceived, int64(len(lines)))
atomic.AddInt64(&s.stats.BytesReceived, int64(n))
}
}()
return s.udpConn.LocalAddr(), nil
}
func (s *Service) handleLine(line string) {
if line == "" {
return
}
// Parse it.
point, err := s.parser.Parse(line)
if err != nil {
switch err := err.(type) {
case *UnsupportedValueError:
// Graphite ignores NaN values with no error.
if math.IsNaN(err.Value) {
atomic.AddInt64(&s.stats.PointsNaNFail, 1)
return
}
}
s.logger.Info(fmt.Sprintf("unable to parse line: %s: %s", line, err))
atomic.AddInt64(&s.stats.PointsParseFail, 1)
return
}
s.batcher.In() <- point
}
// processBatches continually drains the given batcher and writes the batches to the database.
func (s *Service) processBatches(batcher *tsdb.PointBatcher) {
defer s.wg.Done()
for {
select {
case batch := <-batcher.Out():
// Will attempt to create database if not yet created.
if err := s.createInternalStorage(); err != nil {
s.logger.Info(fmt.Sprintf("Required database or retention policy do not yet exist: %s", err.Error()))
continue
}
if err := s.PointsWriter.WritePoints(s.database, s.retentionPolicy, models.ConsistencyLevelAny, batch); err == nil {
atomic.AddInt64(&s.stats.BatchesTransmitted, 1)
atomic.AddInt64(&s.stats.PointsTransmitted, int64(len(batch)))
} else {
s.logger.Info(fmt.Sprintf("failed to write point batch to database %q: %s", s.database, err))
atomic.AddInt64(&s.stats.BatchesTransmitFail, 1)
}
case <-s.done:
return
}
}
}
// Diagnostics returns diagnostics of the graphite service.
func (s *Service) Diagnostics() (*diagnostics.Diagnostics, error) {
s.tcpConnectionsMu.Lock()
defer s.tcpConnectionsMu.Unlock()
d := &diagnostics.Diagnostics{
Columns: []string{"local", "remote", "connect time"},
Rows: make([][]interface{}, 0, len(s.tcpConnections)),
}
for _, v := range s.tcpConnections {
d.Rows = append(d.Rows, []interface{}{v.conn.LocalAddr().String(), v.conn.RemoteAddr().String(), v.connectTime})
}
return d, nil
}