traefik/pkg/tracing/datadog/datadog.go

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package datadog
import (
"io"
"net"
"os"
"strings"
"github.com/opentracing/opentracing-go"
"github.com/traefik/traefik/v2/pkg/log"
ddtracer "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/opentracer"
datadog "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
)
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// Name sets the name of this tracer.
const Name = "datadog"
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// Config provides configuration settings for a datadog tracer.
type Config struct {
LocalAgentHostPort string `description:"Sets the Datadog Agent host:port." json:"localAgentHostPort,omitempty" toml:"localAgentHostPort,omitempty" yaml:"localAgentHostPort,omitempty"`
GlobalTag string `description:"Sets a key:value tag on all spans." json:"globalTag,omitempty" toml:"globalTag,omitempty" yaml:"globalTag,omitempty" export:"true"`
Debug bool `description:"Enables Datadog debug." json:"debug,omitempty" toml:"debug,omitempty" yaml:"debug,omitempty" export:"true"`
PrioritySampling bool `description:"Enables priority sampling. When using distributed tracing, this option must be enabled in order to get all the parts of a distributed trace sampled." json:"prioritySampling,omitempty" toml:"prioritySampling,omitempty" yaml:"prioritySampling,omitempty" export:"true"`
TraceIDHeaderName string `description:"Sets the header name used to store the trace ID." json:"traceIDHeaderName,omitempty" toml:"traceIDHeaderName,omitempty" yaml:"traceIDHeaderName,omitempty" export:"true"`
ParentIDHeaderName string `description:"Sets the header name used to store the parent ID." json:"parentIDHeaderName,omitempty" toml:"parentIDHeaderName,omitempty" yaml:"parentIDHeaderName,omitempty" export:"true"`
SamplingPriorityHeaderName string `description:"Sets the header name used to store the sampling priority." json:"samplingPriorityHeaderName,omitempty" toml:"samplingPriorityHeaderName,omitempty" yaml:"samplingPriorityHeaderName,omitempty" export:"true"`
BagagePrefixHeaderName string `description:"Sets the header name prefix used to store baggage items in a map." json:"bagagePrefixHeaderName,omitempty" toml:"bagagePrefixHeaderName,omitempty" yaml:"bagagePrefixHeaderName,omitempty" export:"true"`
}
// SetDefaults sets the default values.
func (c *Config) SetDefaults() {
host, ok := os.LookupEnv("DD_AGENT_HOST")
if !ok {
host = "localhost"
}
port, ok := os.LookupEnv("DD_TRACE_AGENT_PORT")
if !ok {
port = "8126"
}
c.LocalAgentHostPort = net.JoinHostPort(host, port)
}
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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]
}
opts := []datadog.StartOption{
datadog.WithAgentAddr(c.LocalAgentHostPort),
datadog.WithServiceName(serviceName),
datadog.WithGlobalTag(tag[0], value),
datadog.WithDebugMode(c.Debug),
datadog.WithPropagator(datadog.NewPropagator(&datadog.PropagatorConfig{
TraceHeader: c.TraceIDHeaderName,
ParentHeader: c.ParentIDHeaderName,
PriorityHeader: c.SamplingPriorityHeaderName,
BaggagePrefix: c.BagagePrefixHeaderName,
})),
}
if c.PrioritySampling {
opts = append(opts, datadog.WithPrioritySampling())
}
tracer := ddtracer.New(opts...)
// Without this, child spans are getting the NOOP tracer
opentracing.SetGlobalTracer(tracer)
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log.WithoutContext().Debug("Datadog tracer configured")
return tracer, nil, nil
}