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udp_output.go
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/
udp_output.go
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// © 2022 Nokia.
//
// This code is a Contribution to the gNMIc project (“Work”) made under the Google Software Grant and Corporate Contributor License Agreement (“CLA”) and governed by the Apache License 2.0.
// No other rights or licenses in or to any of Nokia’s intellectual property are granted for any other purpose.
// This code is provided on an “as is” basis without any warranties of any kind.
//
// SPDX-License-Identifier: Apache-2.0
package udp_output
import (
"context"
"encoding/json"
"fmt"
"io"
"log"
"net"
"text/template"
"time"
"google.golang.org/protobuf/proto"
"github.com/prometheus/client_golang/prometheus"
"github.com/openconfig/gnmic/pkg/formatters"
"github.com/openconfig/gnmic/pkg/gtemplate"
"github.com/openconfig/gnmic/pkg/outputs"
"github.com/openconfig/gnmic/pkg/types"
"github.com/openconfig/gnmic/pkg/utils"
)
const (
defaultRetryTimer = 2 * time.Second
loggingPrefix = "[udp_output:%s] "
)
func init() {
outputs.Register("udp", func() outputs.Output {
return &UDPSock{
Cfg: &Config{},
logger: log.New(io.Discard, loggingPrefix, utils.DefaultLoggingFlags),
}
})
}
type UDPSock struct {
Cfg *Config
conn *net.UDPConn
cancelFn context.CancelFunc
buffer chan []byte
limiter *time.Ticker
logger *log.Logger
mo *formatters.MarshalOptions
evps []formatters.EventProcessor
targetTpl *template.Template
}
type Config struct {
Address string `mapstructure:"address,omitempty"` // ip:port
Rate time.Duration `mapstructure:"rate,omitempty"`
BufferSize uint `mapstructure:"buffer-size,omitempty"`
Format string `mapstructure:"format,omitempty"`
AddTarget string `mapstructure:"add-target,omitempty"`
TargetTemplate string `mapstructure:"target-template,omitempty"`
OverrideTimestamps bool `mapstructure:"override-timestamps,omitempty"`
SplitEvents bool `mapstructure:"split-events,omitempty"`
RetryInterval time.Duration `mapstructure:"retry-interval,omitempty"`
EnableMetrics bool `mapstructure:"enable-metrics,omitempty"`
EventProcessors []string `mapstructure:"event-processors,omitempty"`
}
func (u *UDPSock) SetLogger(logger *log.Logger) {
if logger != nil && u.logger != nil {
u.logger.SetOutput(logger.Writer())
u.logger.SetFlags(logger.Flags())
}
}
func (u *UDPSock) SetEventProcessors(ps map[string]map[string]interface{},
logger *log.Logger,
tcs map[string]*types.TargetConfig,
acts map[string]map[string]interface{}) error {
var err error
u.evps, err = formatters.MakeEventProcessors(
logger,
u.Cfg.EventProcessors,
ps,
tcs,
acts,
)
if err != nil {
return err
}
return nil
}
func (u *UDPSock) Init(ctx context.Context, name string, cfg map[string]interface{}, opts ...outputs.Option) error {
err := outputs.DecodeConfig(cfg, u.Cfg)
if err != nil {
return err
}
u.logger.SetPrefix(fmt.Sprintf(loggingPrefix, name))
for _, opt := range opts {
if err := opt(u); err != nil {
return err
}
}
_, _, err = net.SplitHostPort(u.Cfg.Address)
if err != nil {
return fmt.Errorf("wrong address format: %v", err)
}
if u.Cfg.RetryInterval == 0 {
u.Cfg.RetryInterval = defaultRetryTimer
}
u.buffer = make(chan []byte, u.Cfg.BufferSize)
if u.Cfg.Rate > 0 {
u.limiter = time.NewTicker(u.Cfg.Rate)
}
go func() {
<-ctx.Done()
u.Close()
}()
ctx, u.cancelFn = context.WithCancel(ctx)
u.mo = &formatters.MarshalOptions{
Format: u.Cfg.Format,
OverrideTS: u.Cfg.OverrideTimestamps,
}
if u.Cfg.TargetTemplate == "" {
u.targetTpl = outputs.DefaultTargetTemplate
} else if u.Cfg.AddTarget != "" {
u.targetTpl, err = gtemplate.CreateTemplate("target-template", u.Cfg.TargetTemplate)
if err != nil {
return err
}
u.targetTpl = u.targetTpl.Funcs(outputs.TemplateFuncs)
}
go u.start(ctx)
return nil
}
func (u *UDPSock) Write(ctx context.Context, m proto.Message, meta outputs.Meta) {
if m == nil {
return
}
select {
case <-ctx.Done():
return
default:
rsp, err := outputs.AddSubscriptionTarget(m, meta, u.Cfg.AddTarget, u.targetTpl)
if err != nil {
u.logger.Printf("failed to add target to the response: %v", err)
}
bb, err := outputs.Marshal(rsp, meta, u.mo, u.Cfg.SplitEvents, u.evps...)
if err != nil {
u.logger.Printf("failed marshaling proto msg: %v", err)
return
}
for _, b := range bb {
u.buffer <- b
}
}
}
func (u *UDPSock) WriteEvent(ctx context.Context, ev *formatters.EventMsg) {}
func (u *UDPSock) Close() error {
u.cancelFn()
if u.limiter != nil {
u.limiter.Stop()
}
return nil
}
func (u *UDPSock) RegisterMetrics(reg *prometheus.Registry) {}
func (u *UDPSock) String() string {
b, err := json.Marshal(u)
if err != nil {
return ""
}
return string(b)
}
func (u *UDPSock) start(ctx context.Context) {
var udpAddr *net.UDPAddr
var err error
defer u.Close()
DIAL:
if ctx.Err() != nil {
u.logger.Printf("context error: %v", ctx.Err())
return
}
udpAddr, err = net.ResolveUDPAddr("udp", u.Cfg.Address)
if err != nil {
u.logger.Printf("failed to dial udp: %v", err)
time.Sleep(u.Cfg.RetryInterval)
goto DIAL
}
u.conn, err = net.DialUDP("udp", nil, udpAddr)
if err != nil {
u.logger.Printf("failed to dial udp: %v", err)
time.Sleep(u.Cfg.RetryInterval)
goto DIAL
}
for {
select {
case <-ctx.Done():
return
case b := <-u.buffer:
if u.limiter != nil {
<-u.limiter.C
}
_, err = u.conn.Write(b)
if err != nil {
u.logger.Printf("failed sending udp bytes: %v", err)
time.Sleep(u.Cfg.RetryInterval)
goto DIAL
}
}
}
}
func (u *UDPSock) SetName(name string) {}
func (u *UDPSock) SetClusterName(name string) {}
func (u *UDPSock) SetTargetsConfig(map[string]*types.TargetConfig) {}