78 lines
3.5 KiB
Go
78 lines
3.5 KiB
Go
package datadog
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import (
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"io"
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"net"
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"os"
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"strings"
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"github.com/opentracing/opentracing-go"
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"github.com/traefik/traefik/v2/pkg/log"
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ddtracer "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/opentracer"
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datadog "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
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)
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// Name sets the name of this tracer.
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const Name = "datadog"
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// Config provides configuration settings for a datadog tracer.
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type Config struct {
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LocalAgentHostPort string `description:"Set datadog-agent's host:port that the reporter will used." json:"localAgentHostPort,omitempty" toml:"localAgentHostPort,omitempty" yaml:"localAgentHostPort,omitempty"`
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GlobalTag string `description:"Key:Value tag to be set on all the spans." json:"globalTag,omitempty" toml:"globalTag,omitempty" yaml:"globalTag,omitempty" export:"true"`
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Debug bool `description:"Enable Datadog debug." json:"debug,omitempty" toml:"debug,omitempty" yaml:"debug,omitempty" export:"true"`
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PrioritySampling bool `description:"Enable 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"`
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TraceIDHeaderName string `description:"Specifies the header name that will be used to store the trace ID." json:"traceIDHeaderName,omitempty" toml:"traceIDHeaderName,omitempty" yaml:"traceIDHeaderName,omitempty" export:"true"`
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ParentIDHeaderName string `description:"Specifies the header name that will be used to store the parent ID." json:"parentIDHeaderName,omitempty" toml:"parentIDHeaderName,omitempty" yaml:"parentIDHeaderName,omitempty" export:"true"`
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SamplingPriorityHeaderName string `description:"Specifies the header name that will be used to store the sampling priority." json:"samplingPriorityHeaderName,omitempty" toml:"samplingPriorityHeaderName,omitempty" yaml:"samplingPriorityHeaderName,omitempty" export:"true"`
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BagagePrefixHeaderName string `description:"Specifies the header name prefix that will be used to store baggage items in a map." json:"bagagePrefixHeaderName,omitempty" toml:"bagagePrefixHeaderName,omitempty" yaml:"bagagePrefixHeaderName,omitempty" export:"true"`
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}
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// SetDefaults sets the default values.
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func (c *Config) SetDefaults() {
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host, ok := os.LookupEnv("DD_AGENT_HOST")
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if !ok {
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host = "localhost"
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}
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port, ok := os.LookupEnv("DD_TRACE_AGENT_PORT")
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if !ok {
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port = "8126"
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}
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c.LocalAgentHostPort = net.JoinHostPort(host, port)
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}
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// Setup sets up the tracer.
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func (c *Config) Setup(serviceName string) (opentracing.Tracer, io.Closer, error) {
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tag := strings.SplitN(c.GlobalTag, ":", 2)
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value := ""
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if len(tag) == 2 {
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value = tag[1]
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}
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opts := []datadog.StartOption{
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datadog.WithAgentAddr(c.LocalAgentHostPort),
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datadog.WithServiceName(serviceName),
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datadog.WithGlobalTag(tag[0], value),
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datadog.WithDebugMode(c.Debug),
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datadog.WithPropagator(datadog.NewPropagator(&datadog.PropagatorConfig{
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TraceHeader: c.TraceIDHeaderName,
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ParentHeader: c.ParentIDHeaderName,
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PriorityHeader: c.SamplingPriorityHeaderName,
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BaggagePrefix: c.BagagePrefixHeaderName,
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})),
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}
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if c.PrioritySampling {
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opts = append(opts, datadog.WithPrioritySampling())
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}
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tracer := ddtracer.New(opts...)
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// Without this, child spans are getting the NOOP tracer
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opentracing.SetGlobalTracer(tracer)
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log.WithoutContext().Debug("Datadog tracer configured")
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return tracer, nil, nil
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}
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