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service.go
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service.go
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package graphite
import (
"bufio"
"fmt"
"log"
"net"
"os"
"strings"
"sync"
"time"
"github.com/influxdb/influxdb/cluster"
"github.com/influxdb/influxdb/meta"
"github.com/influxdb/influxdb/tsdb"
)
const (
udpBufferSize = 65536
leaderWaitTimeout = 30 * time.Second
)
type Service struct {
bindAddress string
database string
protocol string
batchSize int
batchTimeout time.Duration
consistencyLevel cluster.ConsistencyLevel
parser *Parser
logger *log.Logger
ln net.Listener
addr net.Addr
wg sync.WaitGroup
done chan struct{}
PointsWriter interface {
WritePoints(p *cluster.WritePointsRequest) error
}
MetaStore interface {
WaitForLeader(d time.Duration) error
CreateDatabaseIfNotExists(name string) (*meta.DatabaseInfo, 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,
protocol: d.Protocol,
batchSize: d.BatchSize,
batchTimeout: time.Duration(d.BatchTimeout),
logger: log.New(os.Stderr, "[graphite] ", log.LstdFlags),
done: make(chan struct{}),
}
consistencyLevel, err := cluster.ParseConsistencyLevel(d.ConsistencyLevel)
if err != nil {
return nil, err
}
s.consistencyLevel = consistencyLevel
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 {
if err := s.MetaStore.WaitForLeader(leaderWaitTimeout); err != nil {
s.logger.Printf("failed to detect a cluster leader: %s", err.Error())
return err
}
if _, err := s.MetaStore.CreateDatabaseIfNotExists(s.database); err != nil {
s.logger.Printf("failed to ensure target database %s exists: %s", s.database, err.Error())
return err
}
s.logger.Printf("ensured target database %s exists", s.database)
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.Printf("%s Graphite input opened on %s", s.protocol, s.addr.String())
return nil
}
// Close stops all data processing on the Graphite input.
func (s *Service) Close() error {
close(s.done)
s.wg.Wait()
s.done = nil
if s.ln != nil {
s.ln.Close()
}
return nil
}
// SetLogger sets the internal logger to the logger passed in.
func (s *Service) SetLogger(l *log.Logger) {
s.logger = l
}
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.Println("graphite TCP listener closed")
return
}
if err != nil {
s.logger.Println("error accepting TCP connection", err.Error())
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 conn.Close()
defer s.wg.Done()
batcher := tsdb.NewPointBatcher(s.batchSize, s.batchTimeout)
batcher.Start()
reader := bufio.NewReader(conn)
// Start processing batches.
s.wg.Add(1)
go s.processBatches(batcher)
for {
// Read up to the next newline.
buf, err := reader.ReadBytes('\n')
if err != nil {
batcher.Flush()
return
}
// Trim the buffer, even though there should be no padding
line := strings.TrimSpace(string(buf))
// Parse it.
point, err := s.parser.Parse(line)
if err != nil {
s.logger.Printf("unable to parse data: %s", err)
continue
}
batcher.In() <- point
}
}
// 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
}
conn, err := net.ListenUDP("udp", addr)
if err != nil {
return nil, err
}
batcher := tsdb.NewPointBatcher(s.batchSize, s.batchTimeout)
batcher.Start()
// Start processing batches.
s.wg.Add(1)
go s.processBatches(batcher)
buf := make([]byte, udpBufferSize)
s.wg.Add(1)
go func() {
defer s.wg.Done()
for {
n, _, err := conn.ReadFromUDP(buf)
if err != nil {
batcher.Flush()
conn.Close()
return
}
for _, line := range strings.Split(string(buf[:n]), "\n") {
point, err := s.parser.Parse(line)
if err != nil {
continue
}
batcher.In() <- point
}
}
}()
return conn.LocalAddr(), nil
}
// 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():
if err := s.PointsWriter.WritePoints(&cluster.WritePointsRequest{
Database: s.database,
RetentionPolicy: "",
ConsistencyLevel: s.consistencyLevel,
Points: batch,
}); err != nil {
s.logger.Printf("failed to write point batch to database %q: %s", s.database, err)
}
case <-s.done:
return
}
}
}