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tracer.go
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tracer.go
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package tracing
import (
"context"
"fmt"
"net/http"
"sync"
"github.com/justtrackio/gosoline/pkg/cfg"
"github.com/justtrackio/gosoline/pkg/log"
)
//go:generate mockery --name Tracer
type Tracer interface {
HttpHandler(h http.Handler) http.Handler
StartSpan(name string) (context.Context, Span)
StartSpanFromContext(ctx context.Context, name string) (context.Context, Span)
StartSubSpan(ctx context.Context, name string) (context.Context, Span)
}
type TracerSettings struct {
Provider string `cfg:"provider" default:"xray" validate:"required"`
Enabled bool `cfg:"enabled" default:"false"`
AddressType string `cfg:"addr_type" default:"local" validate:"required"`
AddressValue string `cfg:"add_value" default:""`
Sampling SamplingConfiguration `cfg:"sampling"`
StreamingMaxSubsegmentCount int `cfg:"streaming_max_subsegment_count" default:"20"`
}
var tracerContainer = struct {
sync.Mutex
instance Tracer
}{}
func ProvideTracer(config cfg.Config, logger log.Logger) (Tracer, error) {
tracerContainer.Lock()
defer tracerContainer.Unlock()
if tracerContainer.instance != nil {
return tracerContainer.instance, nil
}
instance, err := NewTracer(config, logger)
if err != nil {
return nil, err
}
tracerContainer.instance = instance
return tracerContainer.instance, nil
}
func NewTracer(config cfg.Config, logger log.Logger) (Tracer, error) {
settings := &TracerSettings{}
config.UnmarshalKey("tracing", settings)
if !settings.Enabled {
return NewNoopTracer(), nil
}
if _, ok := providers[settings.Provider]; !ok {
return nil, fmt.Errorf("no tracing provider found for name %s", settings.Provider)
}
provider := providers[settings.Provider]
return provider(config, logger)
}