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observability.go
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observability.go
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//
// Copyright (C) 2019-2020 Vdaas.org Vald team ( kpango, rinx, kmrmt )
//
// 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
//
// https://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 observability provides observability functions
package observability
import (
"context"
"github.com/vdaas/vald/internal/config"
"github.com/vdaas/vald/internal/errgroup"
"github.com/vdaas/vald/internal/errors"
"github.com/vdaas/vald/internal/observability/collector"
"github.com/vdaas/vald/internal/observability/exporter/jaeger"
"github.com/vdaas/vald/internal/observability/exporter/prometheus"
"github.com/vdaas/vald/internal/observability/metrics"
"github.com/vdaas/vald/internal/observability/metrics/grpc"
"github.com/vdaas/vald/internal/observability/trace"
"github.com/vdaas/vald/internal/safety"
)
type Observability interface {
PreStart(ctx context.Context) error
Start(ctx context.Context) <-chan error
Stop(ctx context.Context)
}
type observability struct {
eg errgroup.Group
collector collector.Collector
tracer trace.Tracer
prometheus prometheus.Prometheus
jaeger jaeger.Jaeger
}
func NewWithConfig(cfg *config.Observability, metrics ...metrics.Metric) (Observability, error) {
opts := make([]Option, 0)
col, err := collector.New(
collector.WithDuration(cfg.Collector.Duration),
collector.WithVersionInfo(cfg.Collector.Metrics.EnableVersionInfo),
collector.WithMemoryMetrics(cfg.Collector.Metrics.EnableMemory),
collector.WithGoroutineMetrics(cfg.Collector.Metrics.EnableGoroutine),
collector.WithCGOMetrics(cfg.Collector.Metrics.EnableCGO),
collector.WithMetrics(metrics...),
)
if err != nil {
return nil, err
}
opts = append(opts, WithCollector(col))
if cfg.Trace.Enabled {
opts = append(opts,
WithTracer(trace.New(trace.WithSamplingRate(cfg.Trace.SamplingRate))),
)
}
if cfg.Prometheus.Enabled {
prom, err := prometheus.New(
prometheus.WithEndpoint(cfg.Prometheus.Endpoint),
prometheus.WithNamespace(cfg.Prometheus.Namespace),
)
if err != nil {
return nil, err
}
opts = append(opts, WithPrometheus(prom))
}
if cfg.Jaeger.Enabled {
jae, err := jaeger.New(
jaeger.WithCollectorEndpoint(cfg.Jaeger.CollectorEndpoint),
jaeger.WithAgentEndpoint(cfg.Jaeger.AgentEndpoint),
jaeger.WithUsername(cfg.Jaeger.Username),
jaeger.WithPassword(cfg.Jaeger.Password),
jaeger.WithServiceName(cfg.Jaeger.ServiceName),
jaeger.WithBufferMaxCount(cfg.Jaeger.BufferMaxCount),
)
if err != nil {
return nil, err
}
opts = append(opts, WithJaeger(jae))
}
return New(opts...)
}
func New(opts ...Option) (Observability, error) {
o := new(observability)
for _, opt := range append(observabilityDefaultOpts, opts...) {
err := opt(o)
if err != nil {
return nil, err
}
}
return o, nil
}
func (o *observability) PreStart(ctx context.Context) (err error) {
ctx, cancel := context.WithCancel(ctx)
defer func() {
if err != nil {
cancel()
}
}()
err = metrics.RegisterView(grpc.DefaultServerViews...)
if err != nil {
return err
}
if o.collector == nil {
return errors.ErrCollectorNotFound()
}
err = o.collector.PreStart(ctx)
if err != nil {
return err
}
if o.prometheus != nil {
err = o.prometheus.Start(ctx)
if err != nil {
return err
}
}
if o.jaeger != nil {
err = o.jaeger.Start(ctx)
if err != nil {
return err
}
}
if o.tracer != nil {
o.tracer.Start(ctx)
}
return nil
}
func (o *observability) Start(ctx context.Context) <-chan error {
ech := make(chan error, 2)
o.eg.Go(safety.RecoverFunc(func() (err error) {
defer close(ech)
cech := o.collector.Start(ctx)
for {
select {
case <-ctx.Done():
return ctx.Err()
case err = <-cech:
}
if err != nil {
select {
case <-ctx.Done():
return ctx.Err()
case ech <- err:
}
}
}
}))
return ech
}
func (o *observability) Stop(ctx context.Context) {
o.collector.Stop(ctx)
if o.prometheus != nil {
o.prometheus.Stop(ctx)
}
if o.jaeger != nil {
o.jaeger.Stop(ctx)
}
}