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70 lines
3.0 KiB
Go
70 lines
3.0 KiB
Go
package haystack
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import (
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"io"
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"strings"
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"time"
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"github.com/ExpediaDotCom/haystack-client-go"
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"github.com/opentracing/opentracing-go"
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"github.com/traefik/traefik/v2/pkg/log"
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)
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// Name sets the name of this tracer.
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const Name = "haystack"
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// Config provides configuration settings for a haystack tracer.
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type Config struct {
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LocalAgentHost string `description:"Sets the Haystack Agent host." json:"localAgentHost,omitempty" toml:"localAgentHost,omitempty" yaml:"localAgentHost,omitempty"`
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LocalAgentPort int `description:"Sets the Haystack Agent port." json:"localAgentPort,omitempty" toml:"localAgentPort,omitempty" yaml:"localAgentPort,omitempty"`
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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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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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SpanIDHeaderName string `description:"Sets the header name used to store the span ID." json:"spanIDHeaderName,omitempty" toml:"spanIDHeaderName,omitempty" yaml:"spanIDHeaderName,omitempty" export:"true"`
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BaggagePrefixHeaderName string `description:"Sets the header name prefix used to store baggage items in a map." json:"baggagePrefixHeaderName,omitempty" toml:"baggagePrefixHeaderName,omitempty" yaml:"baggagePrefixHeaderName,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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c.LocalAgentHost = "127.0.0.1"
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c.LocalAgentPort = 35000
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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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host := "localhost"
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port := 35000
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if len(c.LocalAgentHost) > 0 {
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host = c.LocalAgentHost
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}
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if c.LocalAgentPort > 0 {
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port = c.LocalAgentPort
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}
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tracer, closer := haystack.NewTracer(serviceName, haystack.NewAgentDispatcher(host, port, 3*time.Second, 1000),
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haystack.TracerOptionsFactory.Tag(tag[0], value),
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haystack.TracerOptionsFactory.Propagator(opentracing.HTTPHeaders,
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haystack.NewTextMapPropagator(haystack.PropagatorOpts{
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TraceIDKEYName: c.TraceIDHeaderName,
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ParentSpanIDKEYName: c.ParentIDHeaderName,
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SpanIDKEYName: c.SpanIDHeaderName,
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BaggagePrefixKEYName: c.BaggagePrefixHeaderName,
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}, haystack.DefaultCodex{})),
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haystack.TracerOptionsFactory.Logger(&haystackLogger{logger: log.WithoutContext()}),
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)
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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("haystack tracer configured")
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return tracer, closer, nil
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}
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