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Merged
shelbyspees merged 2 commits into from
Sep 21, 2021
Merged

Add helpers #3

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d50966c
go mod tidy
Sep 21, 2021
79e77e0
add simple trace propagation carrier and helper for envvars
Sep 21, 2021
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2 changes: 1 addition & 1 deletion go.mod
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@ module github.com/equinix-labs/otel-init-go
go 1.15

require (
github.com/google/go-cmp v0.5.6 // indirect
github.com/google/go-cmp v0.5.6
go.opentelemetry.io/otel v1.0.0-RC2
go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.0.0-RC2
go.opentelemetry.io/otel/sdk v1.0.0-RC2
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24 changes: 24 additions & 0 deletions otelhelpers/env_traceparent.go
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@@ -0,0 +1,24 @@
package otelhelpers

import (
"context"
"os"

"go.opentelemetry.io/otel"
)

// ContextWithEnvTraceparent is a helper that looks for the the TRACEPARENT
// environment variable and if it's set, it grabs the traceparent and
// adds it to the context it returns. When there is no envvar or it's
// empty, the original context is returned unmodified.
func ContextWithEnvTraceparent(ctx context.Context) context.Context {
traceparent := os.Getenv("TRACEPARENT")
if traceparent != "" {
carrier := SimpleCarrier{}
carrier.Set("traceparent", traceparent)
prop := otel.GetTextMapPropagator()
return prop.Extract(ctx, carrier)
}

return ctx
}
33 changes: 33 additions & 0 deletions otelhelpers/simple_carrier.go
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@@ -0,0 +1,33 @@
package otelhelpers

// SimpleCarrier is an abstraction for handling traceparent propagation
// that needs a type that implements the propagation.TextMapCarrier().
// This is the simplest possible implementation that is a little fragile
// but since we're not doing anything else with it, it's fine for this.
type SimpleCarrier map[string]string

// Get implements the otel interface for propagation.
func (otp SimpleCarrier) Get(key string) string {
return otp[key]
}

// Set implements the otel interface for propagation.
func (otp SimpleCarrier) Set(key, value string) {
otp[key] = value
}

// Keys implements the otel interface for propagation.
func (otp SimpleCarrier) Keys() []string {
out := []string{}
for k := range otp {
out = append(out, k)
}
return out
}

// Clear implements the otel interface for propagation.
func (otp SimpleCarrier) Clear() {
for k := range otp {
delete(otp, k)
}
}