traefik/pkg/tracing/haystack/haystack.go

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package haystack
import (
"io"
"strings"
"time"
"github.com/ExpediaDotCom/haystack-client-go"
"github.com/containous/traefik/pkg/log"
"github.com/opentracing/opentracing-go"
)
// Name sets the name of this tracer
const Name = "haystack"
// Config provides configuration settings for a haystack tracer
type Config struct {
LocalAgentHost string `description:"Set haystack-agent's host that the reporter will used." export:"false"`
LocalAgentPort int `description:"Set haystack-agent's port that the reporter will used." export:"false"`
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GlobalTag string `description:"Key:Value tag to be set on all the spans." export:"true"`
TraceIDHeaderName string `description:"Specifies the header name that will be used to store the trace ID." export:"true"`
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ParentIDHeaderName string `description:"Specifies the header name that will be used to store the parent ID." export:"true"`
SpanIDHeaderName string `description:"Specifies the header name that will be used to store the span ID." export:"true"`
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BaggagePrefixHeaderName string `description:"Specifies the header name prefix that will be used to store baggage items in a map." export:"true"`
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}
// SetDefaults sets the default values.
func (c *Config) SetDefaults() {
c.LocalAgentHost = "LocalAgentHost"
c.LocalAgentPort = 35000
}
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// Setup sets up the tracer
func (c *Config) Setup(serviceName string) (opentracing.Tracer, io.Closer, error) {
tag := strings.SplitN(c.GlobalTag, ":", 2)
value := ""
if len(tag) == 2 {
value = tag[1]
}
host := "localhost"
port := 35000
if len(c.LocalAgentHost) > 0 {
host = c.LocalAgentHost
}
if c.LocalAgentPort > 0 {
port = c.LocalAgentPort
}
tracer, closer := haystack.NewTracer(serviceName, haystack.NewAgentDispatcher(host, port, 3*time.Second, 1000),
haystack.TracerOptionsFactory.Tag(tag[0], value),
haystack.TracerOptionsFactory.Propagator(opentracing.HTTPHeaders,
haystack.NewTextMapPropagator(haystack.PropagatorOpts{
TraceIDKEYName: c.TraceIDHeaderName,
ParentSpanIDKEYName: c.ParentIDHeaderName,
SpanIDKEYName: c.SpanIDHeaderName,
BaggagePrefixKEYName: c.BaggagePrefixHeaderName,
}, haystack.DefaultCodex{})),
haystack.TracerOptionsFactory.Logger(&haystackLogger{logger: log.WithoutContext()}),
)
// Without this, child spans are getting the NOOP tracer
opentracing.SetGlobalTracer(tracer)
log.WithoutContext().Debug("DataDog tracer configured")
return tracer, closer, nil
}