add tracing and refactor some api pkgs

internal/tracing/log/config.go

@@ -0,0 +1,21 @@
+package log
+
+import (
+	"go.opencensus.io/trace"
+
+	"github.com/caos/zitadel/internal/tracing"
+)
+
+type Config struct {
+	Fraction float64
+}
+
+func (c *Config) NewTracer() error {
+	if c.Fraction < 1 {
+		c.Fraction = 1
+	}
+
+	tracing.T = &Tracer{trace.ProbabilitySampler(c.Fraction)}
+
+	return tracing.T.Start()
+}

internal/tracing/log/logTracing.go

@@ -0,0 +1,74 @@
+package log
+
+import (
+	"context"
+	"net/http"
+
+	"go.opencensus.io/examples/exporter"
+	"go.opencensus.io/plugin/ocgrpc"
+	"go.opencensus.io/plugin/ochttp"
+	"go.opencensus.io/stats/view"
+	"go.opencensus.io/trace"
+
+	"github.com/caos/zitadel/internal/errors"
+	"github.com/caos/zitadel/internal/tracing"
+)
+
+type Tracer struct {
+	sampler trace.Sampler
+}
+
+func (t *Tracer) Start() error {
+	trace.RegisterExporter(&exporter.PrintExporter{})
+
+	views := append(ocgrpc.DefaultServerViews, ocgrpc.DefaultClientViews...)
+	views = append(views, ochttp.DefaultClientViews...)
+	views = append(views, ochttp.DefaultServerViews...)
+
+	if err := view.Register(views...); err != nil {
+		return errors.ThrowInternal(err, "LOG-PoFiB", "unable to register view")
+	}
+
+	trace.ApplyConfig(trace.Config{DefaultSampler: t.sampler})
+
+	return nil
+}
+
+func (t *Tracer) Sampler() trace.Sampler {
+	return t.sampler
+}
+
+func (t *Tracer) NewServerInterceptorSpan(ctx context.Context, name string) (context.Context, *tracing.Span) {
+	return t.newSpanFromName(ctx, name, trace.WithSpanKind(trace.SpanKindServer))
+}
+
+func (t *Tracer) NewServerSpan(ctx context.Context, caller string) (context.Context, *tracing.Span) {
+	return t.newSpan(ctx, caller, trace.WithSpanKind(trace.SpanKindServer))
+}
+
+func (t *Tracer) NewClientInterceptorSpan(ctx context.Context, name string) (context.Context, *tracing.Span) {
+	return t.newSpanFromName(ctx, name, trace.WithSpanKind(trace.SpanKindClient))
+}
+
+func (t *Tracer) NewClientSpan(ctx context.Context, caller string) (context.Context, *tracing.Span) {
+	return t.newSpan(ctx, caller, trace.WithSpanKind(trace.SpanKindClient))
+}
+
+func (t *Tracer) NewSpan(ctx context.Context, caller string) (context.Context, *tracing.Span) {
+	return t.newSpan(ctx, caller)
+}
+
+func (t *Tracer) newSpan(ctx context.Context, caller string, options ...trace.StartOption) (context.Context, *tracing.Span) {
+	return t.newSpanFromName(ctx, caller, options...)
+}
+
+func (t *Tracer) newSpanFromName(ctx context.Context, name string, options ...trace.StartOption) (context.Context, *tracing.Span) {
+	ctx, span := trace.StartSpan(ctx, name, options...)
+	return ctx, tracing.CreateSpan(span)
+}
+
+func (t *Tracer) NewSpanHTTP(r *http.Request, caller string) (*http.Request, *tracing.Span) {
+	ctx, span := t.NewSpan(r.Context(), caller)
+	r = r.WithContext(ctx)
+	return r, span
+}