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" ) // Name sets the name of this tracer. const Name = "datadog" // 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) } // 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) log.WithoutContext().Debug("Datadog tracer configured") return tracer, nil, nil }