traefik/pkg/tracing/elastic/elastic.go

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package elastic
import (
"io"
"net/url"
"github.com/opentracing/opentracing-go"
"github.com/traefik/traefik/v2/pkg/log"
"github.com/traefik/traefik/v2/pkg/version"
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"go.elastic.co/apm"
"go.elastic.co/apm/module/apmot"
"go.elastic.co/apm/transport"
)
// Name sets the name of this tracer.
const Name = "elastic"
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func init() {
// The APM lib uses the init() function to create a default tracer.
// So this default tracer must be disabled.
// https://github.com/elastic/apm-agent-go/blob/8dd383d0d21776faad8841fe110f35633d199a03/tracer.go#L61-L65
apm.DefaultTracer.Close()
}
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// Config provides configuration settings for a elastic.co tracer.
type Config struct {
ServerURL string `description:"Sets the URL of the Elastic APM server." json:"serverURL,omitempty" toml:"serverURL,omitempty" yaml:"serverURL,omitempty"`
SecretToken string `description:"Sets the token used to connect to Elastic APM Server." json:"secretToken,omitempty" toml:"secretToken,omitempty" yaml:"secretToken,omitempty"`
ServiceEnvironment string `description:"Sets the name of the environment Traefik is deployed in, e.g. 'production' or 'staging'." json:"serviceEnvironment,omitempty" toml:"serviceEnvironment,omitempty" yaml:"serviceEnvironment,omitempty" export:"true"`
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}
// Setup sets up the tracer.
func (c *Config) Setup(serviceName string) (opentracing.Tracer, io.Closer, error) {
// Create default transport.
tr, err := transport.NewHTTPTransport()
if err != nil {
return nil, nil, err
}
if c.ServerURL != "" {
serverURL, err := url.Parse(c.ServerURL)
if err != nil {
return nil, nil, err
}
tr.SetServerURL(serverURL)
}
if c.SecretToken != "" {
tr.SetSecretToken(c.SecretToken)
}
tracer, err := apm.NewTracerOptions(apm.TracerOptions{
ServiceName: serviceName,
ServiceVersion: version.Version,
ServiceEnvironment: c.ServiceEnvironment,
Transport: tr,
})
if err != nil {
return nil, nil, err
}
tracer.SetLogger(log.WithoutContext())
otTracer := apmot.New(apmot.WithTracer(tracer))
// Without this, child spans are getting the NOOP tracer
opentracing.SetGlobalTracer(otTracer)
log.WithoutContext().Debug("Elastic tracer configured")
return otTracer, nil, nil
}