telegraf/plugins/outputs/socket_writer/socket_writer.go

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package socket_writer
import (
"crypto/tls"
"fmt"
"log"
"net"
"strings"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal"
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tlsint "github.com/influxdata/telegraf/internal/tls"
"github.com/influxdata/telegraf/plugins/outputs"
"github.com/influxdata/telegraf/plugins/serializers"
)
type SocketWriter struct {
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Address string
KeepAlivePeriod *internal.Duration
tlsint.ClientConfig
serializers.Serializer
net.Conn
}
func (sw *SocketWriter) Description() string {
return "Generic socket writer capable of handling multiple socket types."
}
func (sw *SocketWriter) SampleConfig() string {
return `
## URL to connect to
# address = "tcp://127.0.0.1:8094"
# address = "tcp://example.com:http"
# address = "tcp4://127.0.0.1:8094"
# address = "tcp6://127.0.0.1:8094"
# address = "tcp6://[2001:db8::1]:8094"
# address = "udp://127.0.0.1:8094"
# address = "udp4://127.0.0.1:8094"
# address = "udp6://127.0.0.1:8094"
# address = "unix:///tmp/telegraf.sock"
# address = "unixgram:///tmp/telegraf.sock"
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## Optional TLS Config
# tls_ca = "/etc/telegraf/ca.pem"
# tls_cert = "/etc/telegraf/cert.pem"
# tls_key = "/etc/telegraf/key.pem"
## Use TLS but skip chain & host verification
# insecure_skip_verify = false
## Period between keep alive probes.
## Only applies to TCP sockets.
## 0 disables keep alive probes.
## Defaults to the OS configuration.
# keep_alive_period = "5m"
## Data format to generate.
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## Each data format has its own unique set of configuration options, read
## more about them here:
## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
# data_format = "influx"
`
}
func (sw *SocketWriter) SetSerializer(s serializers.Serializer) {
sw.Serializer = s
}
func (sw *SocketWriter) Connect() error {
spl := strings.SplitN(sw.Address, "://", 2)
if len(spl) != 2 {
return fmt.Errorf("invalid address: %s", sw.Address)
}
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tlsCfg, err := sw.ClientConfig.TLSConfig()
if err != nil {
return err
}
var c net.Conn
if tlsCfg == nil {
c, err = net.Dial(spl[0], spl[1])
} else {
c, err = tls.Dial(spl[0], spl[1], tlsCfg)
}
if err != nil {
return err
}
if err := sw.setKeepAlive(c); err != nil {
log.Printf("unable to configure keep alive (%s): %s", sw.Address, err)
}
sw.Conn = c
return nil
}
func (sw *SocketWriter) setKeepAlive(c net.Conn) error {
if sw.KeepAlivePeriod == nil {
return nil
}
tcpc, ok := c.(*net.TCPConn)
if !ok {
return fmt.Errorf("cannot set keep alive on a %s socket", strings.SplitN(sw.Address, "://", 2)[0])
}
if sw.KeepAlivePeriod.Duration == 0 {
return tcpc.SetKeepAlive(false)
}
if err := tcpc.SetKeepAlive(true); err != nil {
return err
}
return tcpc.SetKeepAlivePeriod(sw.KeepAlivePeriod.Duration)
}
// Write writes the given metrics to the destination.
// If an error is encountered, it is up to the caller to retry the same write again later.
// Not parallel safe.
func (sw *SocketWriter) Write(metrics []telegraf.Metric) error {
if sw.Conn == nil {
// previous write failed with permanent error and socket was closed.
if err := sw.Connect(); err != nil {
return err
}
}
for _, m := range metrics {
bs, err := sw.Serialize(m)
if err != nil {
log.Printf("D! [outputs.socket_writer] Could not serialize metric: %v", err)
continue
}
if _, err := sw.Conn.Write(bs); err != nil {
//TODO log & keep going with remaining strings
if err, ok := err.(net.Error); !ok || !err.Temporary() {
// permanent error. close the connection
sw.Close()
sw.Conn = nil
return fmt.Errorf("closing connection: %v", err)
}
return err
}
}
return nil
}
// Close closes the connection. Noop if already closed.
func (sw *SocketWriter) Close() error {
if sw.Conn == nil {
return nil
}
err := sw.Conn.Close()
sw.Conn = nil
return err
}
func newSocketWriter() *SocketWriter {
s, _ := serializers.NewInfluxSerializer()
return &SocketWriter{
Serializer: s,
}
}
func init() {
outputs.Add("socket_writer", func() telegraf.Output { return newSocketWriter() })
}