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tracer.go
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tracer.go
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package tracing
import (
"io"
"strings"
opentracing "github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
jeagerConf "github.com/uber/jaeger-client-go/config"
"github.com/uber/jaeger-client-go/zipkin"
)
type Tracer struct {
ServiceName string
Provider string
Logger logrus.FieldLogger
JaegerConfig *JaegerConfig
tracer opentracing.Tracer
closer io.Closer
}
type JaegerConfig struct {
LocalAgentHostPort string
SamplerType string
SamplerValue float64
SamplerServerUrl string
Propagation string
}
func (t *Tracer) Setup() error {
switch strings.ToLower(t.Provider) {
case "jaeger":
jc, err := jeagerConf.FromEnv()
if err != nil {
return err
}
if t.JaegerConfig.SamplerServerUrl != "" {
jc.Sampler.SamplingServerURL = t.JaegerConfig.SamplerServerUrl
}
if t.JaegerConfig.SamplerType != "" {
jc.Sampler.Type = t.JaegerConfig.SamplerType
}
if t.JaegerConfig.SamplerValue != 0 {
jc.Sampler.Param = t.JaegerConfig.SamplerValue
}
if t.JaegerConfig.LocalAgentHostPort != "" {
jc.Reporter.LocalAgentHostPort = t.JaegerConfig.LocalAgentHostPort
}
var configs []jeagerConf.Option
// This works in other jaeger clients, but is not part of jaeger-client-go
if t.JaegerConfig.Propagation == "b3" {
zipkinPropagator := zipkin.NewZipkinB3HTTPHeaderPropagator()
configs = append(
configs,
jeagerConf.Injector(opentracing.HTTPHeaders, zipkinPropagator),
jeagerConf.Extractor(opentracing.HTTPHeaders, zipkinPropagator),
)
}
closer, err := jc.InitGlobalTracer(
t.ServiceName,
configs...,
)
if err != nil {
return err
}
t.closer = closer
t.tracer = opentracing.GlobalTracer()
t.Logger.Infof("Jaeger tracer configured!")
case "":
t.Logger.Infof("No tracer configured - skipping tracing setup")
default:
return errors.Errorf("unknown tracer: %s", t.Provider)
}
return nil
}
func (t *Tracer) IsLoaded() bool {
if t == nil || t.tracer == nil {
return false
}
return true
}
func (t *Tracer) Close() {
if t.closer != nil {
err := t.closer.Close()
if err != nil {
t.Logger.Warn(err)
}
}
}
func HelpMessage() string {
return `- TRACING_PROVIDER: Set this to the tracing backend you wish to use.
Supported tracing backends: [jaeger]
Example: TRACING_PROVIDER=jaeger
- TRACING_PROVIDER_JAEGER_SAMPLING_SERVER_URL: The address of jaeger-agent's HTTP sampling server
Example: TRACING_PROVIDER_JAEGER_SAMPLING_SERVER_URL=http://localhost:5778/sampling
- TRACING_PROVIDER_JAEGER_SAMPLING_TYPE: The type of the sampler you want to use
Supported values: [const, probabilistic, ratelimiting]
Default: const
Example: TRACING_PROVIDER_JAEGER_SAMPLING_TYPE=const
- TRACING_PROVIDER_JAEGER_SAMPLING_VALUE: The value passed to the sampler type that has been configured.
Supported values: This is dependant on the sampling strategy used:
- const: 0 or 1 (all or nothing)
- rateLimiting: a constant rate (e.g. setting this to 3 will sample requests with the rate of 3 traces per second)
- probabilistic: a value between 0..1
Example: TRACING_PROVIDER_JAEGER_SAMPLING_VALUE=1
- TRACING_PROVIDER_JAEGER_LOCAL_AGENT_ADDRESS: The address of the jaeger-agent where spans should be sent to
Example: TRACING_PROVIDER_JAEGER_LOCAL_AGENT_ADDRESS=127.0.0.1:6831
- TRACING_PROVIDER_JAEGER_PROPAGATION: The tracing header propagation format. Defaults to jaeger.
Example: TRACING_PROVIDER_JAEGER_PROPAGATION=b3
- TRACING_SERVICE_NAME: Specifies the service name to use on the tracer.
Default: ORY Hydra
Example: TRACING_SERVICE_NAME="ORY Hydra"
`
}