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tracer.go
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package tracer
import (
"fmt"
"net/http"
"strings"
"github.com/alexfalkowski/go-service/meta"
"github.com/alexfalkowski/go-service/telemetry/tracer"
tstrings "github.com/alexfalkowski/go-service/transport/strings"
"github.com/alexfalkowski/go-service/version"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
semconv "go.opentelemetry.io/otel/semconv/v1.19.0"
"go.opentelemetry.io/otel/semconv/v1.19.0/httpconv"
"go.opentelemetry.io/otel/trace"
"go.uber.org/fx"
)
// Params for tracer.
type Params struct {
fx.In
Lifecycle fx.Lifecycle
Config *tracer.Config
Version version.Version
}
// NewTracer for tracer.
func NewTracer(params Params) (Tracer, error) {
return tracer.NewTracer(params.Lifecycle, "http", params.Version, params.Config)
}
// Tracer for tracer.
type Tracer trace.Tracer
// Handler for tracer.
type Handler struct {
tracer Tracer
http.Handler
}
// NewHandler for tracer.
func NewHandler(tracer Tracer, handler http.Handler) *Handler {
return &Handler{tracer: tracer, Handler: handler}
}
// ServeHTTP for tracer.
func (h *Handler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
service, method := req.URL.Path, strings.ToLower(req.Method)
if tstrings.IsHealth(service) {
h.Handler.ServeHTTP(resp, req)
return
}
ctx := extract(req.Context(), req)
attrs := []attribute.KeyValue{
semconv.HTTPRoute(service),
semconv.HTTPMethod(method),
}
attrs = append(attrs, httpconv.ServerRequest("", req)...)
operationName := fmt.Sprintf("%s %s", method, service)
ctx, span := h.tracer.Start(
trace.ContextWithRemoteSpanContext(ctx, trace.SpanContextFromContext(ctx)),
operationName,
trace.WithSpanKind(trace.SpanKindServer),
trace.WithAttributes(attrs...),
)
defer span.End()
h.Handler.ServeHTTP(resp, req.WithContext(ctx))
for k, v := range meta.Attributes(ctx) {
span.SetAttributes(attribute.Key(k).String(v))
}
}
// NewRoundTripper for tracer.
func NewRoundTripper(tracer Tracer, hrt http.RoundTripper) *RoundTripper {
return &RoundTripper{tracer: tracer, RoundTripper: hrt}
}
// RoundTripper for tracer.
type RoundTripper struct {
tracer Tracer
http.RoundTripper
}
// RoundTrip for tracer.
func (r *RoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
if tstrings.IsHealth(req.URL.String()) {
return r.RoundTripper.RoundTrip(req)
}
service, method := req.URL.Hostname(), strings.ToLower(req.Method)
ctx := req.Context()
operationName := fmt.Sprintf("%s %s", method, service)
attrs := []attribute.KeyValue{
semconv.HTTPRoute(service),
semconv.HTTPMethod(method),
}
attrs = append(attrs, httpconv.ClientRequest(req)...)
ctx, span := r.tracer.Start(
ctx,
operationName,
trace.WithSpanKind(trace.SpanKindClient),
trace.WithAttributes(attrs...),
)
defer span.End()
inject(ctx, req)
resp, err := r.RoundTripper.RoundTrip(req.WithContext(ctx))
for k, v := range meta.Attributes(ctx) {
span.SetAttributes(attribute.Key(k).String(v))
}
if err != nil {
span.SetStatus(codes.Error, err.Error())
span.RecordError(err)
return nil, err
}
span.SetAttributes(semconv.HTTPStatusCode(resp.StatusCode))
span.SetAttributes(httpconv.ClientResponse(resp)...)
return resp, nil
}