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libcni: add OpenTelemetry trace context propagation #1173

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10 changes: 6 additions & 4 deletions go.mod
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Original file line number Diff line number Diff line change
@@ -1,20 +1,22 @@
module github.com/containernetworking/cni

go 1.21
go 1.23.0
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@jipperinbham jipperinbham Nov 10, 2025

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I'm guessing this is causing the CI failure. @squeed would you prefer I rollback to 1.21?


require (
github.com/onsi/ginkgo/v2 v2.20.1
github.com/onsi/gomega v1.34.1
github.com/spf13/cobra v1.9.1
github.com/vishvananda/netns v0.0.4
go.opentelemetry.io/otel v1.38.0
go.opentelemetry.io/otel/trace v1.38.0
)

require (
github.com/go-logr/logr v1.4.2 // indirect
github.com/go-logr/logr v1.4.3 // indirect
github.com/go-task/slim-sprig/v3 v3.0.0 // indirect
github.com/google/go-cmp v0.6.0 // indirect
github.com/google/go-cmp v0.7.0 // indirect
github.com/google/pprof v0.0.0-20240727154555-813a5fbdbec8 // indirect
github.com/inconshreveable/mousetrap v1.1.0 // indirect
github.com/spf13/cobra v1.9.1 // indirect
github.com/spf13/pflag v1.0.6 // indirect
golang.org/x/exp v0.0.0-20240719175910-8a7402abbf56 // indirect
golang.org/x/net v0.28.0 // indirect
Expand Down
22 changes: 16 additions & 6 deletions go.sum
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Open in desktop
Original file line number Diff line number Diff line change
@@ -1,12 +1,14 @@
github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
github.com/go-task/slim-sprig/v3 v3.0.0 h1:sUs3vkvUymDpBKi3qH1YSqBQk9+9D/8M2mN1vB6EwHI=
github.com/go-task/slim-sprig/v3 v3.0.0/go.mod h1:W848ghGpv3Qj3dhTPRyJypKRiqCdHZiAzKg9hl15HA8=
github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
github.com/google/pprof v0.0.0-20240727154555-813a5fbdbec8 h1:FKHo8hFI3A+7w0aUQuYXQ+6EN5stWmeY/AZqtM8xk9k=
github.com/google/pprof v0.0.0-20240727154555-813a5fbdbec8/go.mod h1:K1liHPHnj73Fdn/EKuT8nrFqBihUSKXoLYU0BuatOYo=
github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
Expand All @@ -22,10 +24,18 @@ github.com/spf13/cobra v1.9.1 h1:CXSaggrXdbHK9CF+8ywj8Amf7PBRmPCOJugH954Nnlo=
github.com/spf13/cobra v1.9.1/go.mod h1:nDyEzZ8ogv936Cinf6g1RU9MRY64Ir93oCnqb9wxYW0=
github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o=
github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
github.com/vishvananda/netns v0.0.4 h1:Oeaw1EM2JMxD51g9uhtC0D7erkIjgmj8+JZc26m1YX8=
github.com/vishvananda/netns v0.0.4/go.mod h1:SpkAiCQRtJ6TvvxPnOSyH3BMl6unz3xZlaprSwhNNJM=
go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
go.opentelemetry.io/otel v1.38.0 h1:RkfdswUDRimDg0m2Az18RKOsnI8UDzppJAtj01/Ymk8=
go.opentelemetry.io/otel v1.38.0/go.mod h1:zcmtmQ1+YmQM9wrNsTGV/q/uyusom3P8RxwExxkZhjM=
go.opentelemetry.io/otel/metric v1.38.0 h1:Kl6lzIYGAh5M159u9NgiRkmoMKjvbsKtYRwgfrA6WpA=
go.opentelemetry.io/otel/metric v1.38.0/go.mod h1:kB5n/QoRM8YwmUahxvI3bO34eVtQf2i4utNVLr9gEmI=
go.opentelemetry.io/otel/trace v1.38.0 h1:Fxk5bKrDZJUH+AMyyIXGcFAPah0oRcT+LuNtJrmcNLE=
go.opentelemetry.io/otel/trace v1.38.0/go.mod h1:j1P9ivuFsTceSWe1oY+EeW3sc+Pp42sO++GHkg4wwhs=
golang.org/x/exp v0.0.0-20240719175910-8a7402abbf56 h1:2dVuKD2vS7b0QIHQbpyTISPd0LeHDbnYEryqj5Q1ug8=
golang.org/x/exp v0.0.0-20240719175910-8a7402abbf56/go.mod h1:M4RDyNAINzryxdtnbRXRL/OHtkFuWGRjvuhBJpk2IlY=
golang.org/x/net v0.28.0 h1:a9JDOJc5GMUJ0+UDqmLT86WiEy7iWyIhz8gz8E4e5hE=
Expand Down
34 changes: 33 additions & 1 deletion pkg/invoke/raw_exec.go
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,9 @@ import (
"time"

"github.com/containernetworking/cni/pkg/types"
"go.opentelemetry.io/otel/baggage"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/trace"
)

type RawExec struct {
Expand All @@ -35,7 +38,7 @@ func (e *RawExec) ExecPlugin(ctx context.Context, pluginPath string, stdinData [
stdout := &bytes.Buffer{}
stderr := &bytes.Buffer{}
c := exec.CommandContext(ctx, pluginPath)
c.Env = environ
c.Env = injectTraceContext(ctx, environ)
c.Stdin = bytes.NewBuffer(stdinData)
c.Stdout = stdout
c.Stderr = stderr
Expand Down Expand Up @@ -69,6 +72,35 @@ func (e *RawExec) ExecPlugin(ctx context.Context, pluginPath string, stdinData [
return stdout.Bytes(), nil
}

// injectTraceContext will add OpenTelemetry trace context to the environment variables based on
// https://github.com/open-telemetry/opentelemetry-specification/blob/main/oteps/0258-env-context-baggage-carriers.md
func injectTraceContext(ctx context.Context, environ []string) []string {
sc := trace.SpanContextFromContext(ctx)
if !sc.IsValid() {
return environ
}

ctx = trace.ContextWithRemoteSpanContext(ctx, sc)
mc := propagation.MapCarrier{}
(propagation.TraceContext{}).Inject(ctx, mc)

// Currently, both traceparent and tracestate are not exported variables,
// https://github.com/open-telemetry/opentelemetry-go/blob/bcf8234d0c9c48b626cad85367a3681f3fc0c0fd/propagation/trace_context.go#L18-L19
// so we have to use the string literals here.
if traceparent := mc.Get("traceparent"); traceparent != "" {
environ = append(environ, "TRACEPARENT"+"="+traceparent)
}

if tracestate := mc.Get("tracestate"); tracestate != "" {
environ = append(environ, "TRACESTATE"+"="+tracestate)
}

if envBaggage := baggage.FromContext(ctx).String(); envBaggage != "" {
environ = append(environ, "BAGGAGE"+"="+envBaggage)
}
return environ
}

func (e *RawExec) pluginErr(err error, stdout, stderr []byte) error {
emsg := types.Error{}
if len(stdout) == 0 {
Expand Down
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