/
gnmi.go
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/
gnmi.go
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// Copyright 2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gnmi
import (
"context"
"fmt"
"net"
"strings"
"time"
gpb "github.com/openconfig/gnmi/proto/gnmi"
"github.com/openconfig/magna/lwotgtelem"
"github.com/openconfig/magna/lwotgtelem/gnmit"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/pdata/pmetric"
"go.uber.org/zap"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/reflection"
"k8s.io/klog/v2"
)
type GNMI struct {
cfg *Config
lis net.Listener
srv *grpc.Server
metricCh chan *pmetric.Metrics
telemSrv *lwotgtelem.Server
logger *zap.Logger
}
func NewGNMIExporter(logger *zap.Logger, cfg *Config) (*GNMI, error) {
telemSrv, err := lwotgtelem.New(context.Background(), cfg.TargetName)
if err != nil {
return nil, err
}
gnmiLis, err := net.Listen("tcp", fmt.Sprintf("%s", cfg.Addr))
if err != nil {
klog.Exitf("cannot listen on %s, err: %v", cfg.Addr, err)
}
var opts []grpc.ServerOption
if cfg.CertFile != "" {
creds, err := credentials.NewServerTLSFromFile(cfg.CertFile, cfg.KeyFile)
if err != nil {
return nil, fmt.Errorf("cannot create gNMI credentials, %v", err)
}
opts = append(opts, grpc.Creds(creds))
}
return &GNMI{
cfg: cfg,
metricCh: make(chan *pmetric.Metrics, cfg.BufferSize),
lis: gnmiLis,
srv: grpc.NewServer(opts...),
telemSrv: telemSrv,
logger: logger,
}, nil
}
func (g *GNMI) Start(_ context.Context, _ component.Host) error {
g.logger.Info("starting")
reflection.Register(g.srv)
gpb.RegisterGNMIServer(g.srv, g.telemSrv.GNMIServer)
go g.srv.Serve(g.lis)
g.telemSrv.AddTask(gnmit.Task{
Run: g.handleMetrics,
})
g.logger.Info("started")
return nil
}
func (g *GNMI) Stop(_ context.Context) error {
close(g.metricCh)
g.srv.GracefulStop()
return nil
}
func (g *GNMI) storeMetric(ctx context.Context, md pmetric.Metrics) error {
select {
case <-ctx.Done():
return ctx.Err()
default:
g.metricCh <- &md
}
return nil
}
// handleMetrics iterates over all received metrics and converts them into a
// gNMI update. This set of updates are then packed into a gNMI notfication
// and sent to the telemetry server.
// Note: this currently supports only SUM metrics.
func (g *GNMI) handleMetrics(_ gnmit.Queue, updateFn gnmit.UpdateFn, target string, cleanup func()) error {
go func() {
for ms := range g.metricCh {
var updates []*gpb.Update
rms := ms.ResourceMetrics()
for i := 0; i < rms.Len(); i++ {
rm := rms.At(i)
ilms := rm.ScopeMetrics()
for j := 0; j < ilms.Len(); j++ {
ilm := ilms.At(j)
ms := ilm.Metrics()
for k := 0; k < ms.Len(); k++ {
m := ms.At(k)
switch m.Type() {
case pmetric.MetricTypeSum:
sumMetrics := m.Sum().DataPoints()
for l := 0; l < sumMetrics.Len(); l++ {
sumMetric := sumMetrics.At(l)
updates = append(updates, &gpb.Update{
Path: &gpb.Path{
Elem: g.toPathElems(m.Name()),
Target: g.cfg.TargetName,
},
Val: &gpb.TypedValue{
Value: &gpb.TypedValue_IntVal{
IntVal: sumMetric.IntValue(),
},
},
})
}
}
}
}
}
if err := updateFn(&gpb.Notification{
Timestamp: time.Now().Unix(),
Prefix: &gpb.Path{
Target: g.cfg.TargetName,
Elem: []*gpb.PathElem{
{
Name: g.cfg.TargetName,
},
},
},
Update: updates,
}); err != nil {
klog.Errorf("failed to send updates %v", err)
}
}
}()
return nil
}
func (g *GNMI) toPathElems(name string) []*gpb.PathElem {
var elems []*gpb.PathElem
for _, p := range strings.Split(name, g.cfg.Sep) {
elems = append(elems, &gpb.PathElem{
Name: p,
// TODO (alshabib): support keyed paths.
})
}
return elems
}