98 lines
4.4 KiB
Go
98 lines
4.4 KiB
Go
package datadog
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import (
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"context"
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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:"Sets the Datadog Agent host:port." json:"localAgentHostPort,omitempty" toml:"localAgentHostPort,omitempty" yaml:"localAgentHostPort,omitempty"`
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LocalAgentSocket string `description:"Sets the socket for the Datadog Agent." json:"localAgentSocket,omitempty" toml:"localAgentSocket,omitempty" yaml:"localAgentSocket,omitempty"`
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// Deprecated: use GlobalTags instead.
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GlobalTag string `description:"Sets a key:value tag on all spans." json:"globalTag,omitempty" toml:"globalTag,omitempty" yaml:"globalTag,omitempty" export:"true"`
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GlobalTags map[string]string `description:"Sets a list of key:value tags on all spans." json:"globalTags,omitempty" toml:"globalTags,omitempty" yaml:"globalTags,omitempty" export:"true"`
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Debug bool `description:"Enables Datadog debug." json:"debug,omitempty" toml:"debug,omitempty" yaml:"debug,omitempty" export:"true"`
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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"`
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TraceIDHeaderName string `description:"Sets the header name used to store the trace ID." json:"traceIDHeaderName,omitempty" toml:"traceIDHeaderName,omitempty" yaml:"traceIDHeaderName,omitempty" export:"true"`
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ParentIDHeaderName string `description:"Sets the header name used to store the parent ID." json:"parentIDHeaderName,omitempty" toml:"parentIDHeaderName,omitempty" yaml:"parentIDHeaderName,omitempty" export:"true"`
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SamplingPriorityHeaderName string `description:"Sets the header name used to store the sampling priority." json:"samplingPriorityHeaderName,omitempty" toml:"samplingPriorityHeaderName,omitempty" yaml:"samplingPriorityHeaderName,omitempty" export:"true"`
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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"`
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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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ctx := log.With(context.Background(), log.Str(log.MetricsProviderName, "datadog"))
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opts := []datadog.StartOption{
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datadog.WithService(serviceName),
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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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datadog.WithLogger(log.NewDatadogLogger(log.FromContext(ctx))),
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}
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if c.LocalAgentSocket != "" {
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opts = append(opts, datadog.WithUDS(c.LocalAgentSocket))
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} else {
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opts = append(opts, datadog.WithAgentAddr(c.LocalAgentHostPort))
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}
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for k, v := range c.GlobalTags {
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opts = append(opts, datadog.WithGlobalTag(k, v))
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}
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if c.GlobalTag != "" {
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log.WithoutContext().Warn(`Datadog: option "globalTag" is deprecated, please use "globalTags" instead.`)
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key, value, _ := strings.Cut(c.GlobalTag, ":")
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// Don't override a tag already defined with the new option.
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if _, ok := c.GlobalTags[key]; !ok {
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opts = append(opts, datadog.WithGlobalTag(key, value))
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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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