224 lines
7.3 KiB
Go
224 lines
7.3 KiB
Go
package tracing
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import (
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"context"
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"fmt"
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"io"
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"net"
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"net/http"
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"strconv"
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"github.com/rs/zerolog/log"
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"github.com/traefik/traefik/v3/pkg/config/static"
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"github.com/traefik/traefik/v3/pkg/tracing/opentelemetry"
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"go.opentelemetry.io/contrib/propagators/autoprop"
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"go.opentelemetry.io/otel"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/codes"
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"go.opentelemetry.io/otel/propagation"
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semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
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"go.opentelemetry.io/otel/trace"
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)
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// Backend is an abstraction for tracking backend (OpenTelemetry, ...).
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type Backend interface {
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Setup(serviceName string, sampleRate float64, globalAttributes map[string]string) (trace.Tracer, io.Closer, error)
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}
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// NewTracing Creates a Tracing.
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func NewTracing(conf *static.Tracing) (trace.Tracer, io.Closer, error) {
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var backend Backend
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if conf.OTLP != nil {
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backend = conf.OTLP
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}
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if backend == nil {
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log.Debug().Msg("Could not initialize tracing, using OpenTelemetry by default")
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defaultBackend := &opentelemetry.Config{}
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backend = defaultBackend
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}
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otel.SetTextMapPropagator(autoprop.NewTextMapPropagator())
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return backend.Setup(conf.ServiceName, conf.SampleRate, conf.GlobalAttributes)
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}
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// TracerFromContext extracts the trace.Tracer from the given context.
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func TracerFromContext(ctx context.Context) trace.Tracer {
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// Prevent picking trace.noopSpan tracer.
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if !trace.SpanContextFromContext(ctx).IsValid() {
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return nil
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}
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span := trace.SpanFromContext(ctx)
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if span != nil && span.TracerProvider() != nil {
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return span.TracerProvider().Tracer("github.com/traefik/traefik")
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}
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return nil
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}
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// ExtractCarrierIntoContext reads cross-cutting concerns from the carrier into a Context.
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func ExtractCarrierIntoContext(ctx context.Context, headers http.Header) context.Context {
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propagator := otel.GetTextMapPropagator()
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return propagator.Extract(ctx, propagation.HeaderCarrier(headers))
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}
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// InjectContextIntoCarrier sets cross-cutting concerns from the request context into the request headers.
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func InjectContextIntoCarrier(req *http.Request) {
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propagator := otel.GetTextMapPropagator()
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propagator.Inject(req.Context(), propagation.HeaderCarrier(req.Header))
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}
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// SetStatusErrorf flags the span as in error and log an event.
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func SetStatusErrorf(ctx context.Context, format string, args ...interface{}) {
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if span := trace.SpanFromContext(ctx); span != nil {
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span.SetStatus(codes.Error, fmt.Sprintf(format, args...))
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}
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}
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// LogClientRequest used to add span attributes from the request as a Client.
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// TODO: the semconv does not implement Semantic Convention v1.23.0.
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func LogClientRequest(span trace.Span, r *http.Request) {
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if r == nil || span == nil {
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return
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}
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// Common attributes https://github.com/open-telemetry/semantic-conventions/blob/v1.23.0/docs/http/http-spans.md#common-attributes
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span.SetAttributes(semconv.HTTPRequestMethodKey.String(r.Method))
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span.SetAttributes(semconv.NetworkProtocolVersion(proto(r.Proto)))
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// Client attributes https://github.com/open-telemetry/semantic-conventions/blob/v1.23.0/docs/http/http-spans.md#http-client
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span.SetAttributes(semconv.URLFull(r.URL.String()))
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span.SetAttributes(semconv.URLScheme(r.URL.Scheme))
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span.SetAttributes(semconv.UserAgentOriginal(r.UserAgent()))
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host, port, err := net.SplitHostPort(r.URL.Host)
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if err != nil {
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span.SetAttributes(attribute.String("network.peer.address", host))
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span.SetAttributes(semconv.ServerAddress(r.URL.Host))
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switch r.URL.Scheme {
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case "http":
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span.SetAttributes(attribute.String("network.peer.port", "80"))
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span.SetAttributes(semconv.ServerPort(80))
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case "https":
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span.SetAttributes(attribute.String("network.peer.port", "443"))
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span.SetAttributes(semconv.ServerPort(443))
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}
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} else {
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span.SetAttributes(attribute.String("network.peer.address", host))
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span.SetAttributes(attribute.String("network.peer.port", port))
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intPort, _ := strconv.Atoi(port)
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span.SetAttributes(semconv.ServerAddress(host))
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span.SetAttributes(semconv.ServerPort(intPort))
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}
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}
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// LogServerRequest used to add span attributes from the request as a Server.
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// TODO: the semconv does not implement Semantic Convention v1.23.0.
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func LogServerRequest(span trace.Span, r *http.Request) {
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if r == nil {
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return
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}
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// Common attributes https://github.com/open-telemetry/semantic-conventions/blob/v1.23.0/docs/http/http-spans.md#common-attributes
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span.SetAttributes(semconv.HTTPRequestMethodKey.String(r.Method))
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span.SetAttributes(semconv.NetworkProtocolVersion(proto(r.Proto)))
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// Server attributes https://github.com/open-telemetry/semantic-conventions/blob/v1.23.0/docs/http/http-spans.md#http-server-semantic-conventions
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span.SetAttributes(semconv.HTTPRequestBodySize(int(r.ContentLength)))
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span.SetAttributes(semconv.URLPath(r.URL.Path))
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span.SetAttributes(semconv.URLQuery(r.URL.RawQuery))
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span.SetAttributes(semconv.URLScheme(r.Header.Get("X-Forwarded-Proto")))
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span.SetAttributes(semconv.UserAgentOriginal(r.UserAgent()))
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span.SetAttributes(semconv.ServerAddress(r.Host))
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host, port, err := net.SplitHostPort(r.RemoteAddr)
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if err != nil {
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span.SetAttributes(semconv.ClientAddress(r.RemoteAddr))
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span.SetAttributes(attribute.String("network.peer.address", r.RemoteAddr))
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} else {
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span.SetAttributes(attribute.String("network.peer.address", host))
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span.SetAttributes(attribute.String("network.peer.port", port))
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span.SetAttributes(semconv.ClientAddress(host))
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intPort, _ := strconv.Atoi(port)
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span.SetAttributes(semconv.ClientPort(intPort))
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}
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span.SetAttributes(semconv.ClientSocketAddress(r.Header.Get("X-Forwarded-For")))
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}
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func proto(proto string) string {
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switch proto {
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case "HTTP/1.0":
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return "1.0"
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case "HTTP/1.1":
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return "1.1"
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case "HTTP/2":
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return "2"
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case "HTTP/3":
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return "3"
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default:
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return proto
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}
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}
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// LogResponseCode used to log response code in span.
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func LogResponseCode(span trace.Span, code int, spanKind trace.SpanKind) {
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if span != nil {
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var status codes.Code
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var desc string
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switch spanKind {
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case trace.SpanKindServer:
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status, desc = ServerStatus(code)
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case trace.SpanKindClient:
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status, desc = ClientStatus(code)
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default:
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status, desc = DefaultStatus(code)
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}
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span.SetStatus(status, desc)
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if code > 0 {
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span.SetAttributes(semconv.HTTPResponseStatusCode(code))
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}
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}
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}
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// ServerStatus returns a span status code and message for an HTTP status code
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// value returned by a server. Status codes in the 400-499 range are not
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// returned as errors.
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func ServerStatus(code int) (codes.Code, string) {
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if code < 100 || code >= 600 {
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return codes.Error, fmt.Sprintf("Invalid HTTP status code %d", code)
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}
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if code >= 500 {
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return codes.Error, ""
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}
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return codes.Unset, ""
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}
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// ClientStatus returns a span status code and message for an HTTP status code
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// value returned by a server. Status codes in the 400-499 range are not
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// returned as errors.
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func ClientStatus(code int) (codes.Code, string) {
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if code < 100 || code >= 600 {
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return codes.Error, fmt.Sprintf("Invalid HTTP status code %d", code)
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}
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if code >= 400 {
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return codes.Error, ""
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}
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return codes.Unset, ""
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}
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// DefaultStatus returns a span status code and message for an HTTP status code
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// value generated internally.
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func DefaultStatus(code int) (codes.Code, string) {
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if code < 100 || code >= 600 {
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return codes.Error, fmt.Sprintf("Invalid HTTP status code %d", code)
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}
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if code >= 500 {
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return codes.Error, ""
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}
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return codes.Unset, ""
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}
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