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jaeger.go
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jaeger.go
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package jaeger
import (
"context"
"github.com/alexfalkowski/go-service/os"
"github.com/alexfalkowski/go-service/version"
opentracing "github.com/opentracing/opentracing-go"
"github.com/uber/jaeger-client-go"
jconfig "github.com/uber/jaeger-client-go/config"
"go.uber.org/fx"
)
const (
eventsPerSecond = 100
)
// TracerParams for jaeger.
type TracerParams struct {
Lifecycle fx.Lifecycle
Name string
Version version.Version
Host string
}
// NewTracer for jaeger.
func NewTracer(params TracerParams) (opentracing.Tracer, error) {
c := jconfig.Configuration{
ServiceName: params.Name,
Sampler: &jconfig.SamplerConfig{
Type: jaeger.SamplerTypeRateLimiting,
Param: eventsPerSecond,
},
Reporter: &jconfig.ReporterConfig{
LocalAgentHostPort: params.Host,
LogSpans: false,
},
}
options := []jconfig.Option{
jconfig.Logger(jaeger.NullLogger),
jconfig.Tag("name", os.ExecutableName()),
jconfig.Tag("version", params.Version),
}
tracer, closer, err := c.NewTracer(options...)
if err != nil {
return nil, err
}
params.Lifecycle.Append(fx.Hook{
OnStop: func(ctx context.Context) error {
return closer.Close()
},
})
return tracer, nil
}