interceptors: migrate to otel and add logging interceptor

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

interceptors/metrics/options.go

@@ -0,0 +1,59 @@
+package metrics
+
+import (
+	"context"
+
+	grpc_prometheus "github.com/grpc-ecosystem/go-grpc-middleware/providers/prometheus"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type ExemplarFromCtxFunc func(ctx context.Context) prometheus.Labels
+
+type Option func(*options)
+
+func WithCounterOptons(opts ...grpc_prometheus.CounterOption) Option {
+	return func(o *options) {
+		o.copts = append(o.copts, opts...)
+	}
+}
+
+func WithHandlingTimeHistogram(opts ...grpc_prometheus.HistogramOption) Option {
+	return func(o *options) {
+		o.hopts = append(o.hopts, opts...)
+	}
+}
+
+func WithHistogramOpts(opts ...grpc_prometheus.HistogramOption) Option {
+	return func(o *options) {
+		o.hopts = append(o.hopts, opts...)
+	}
+}
+
+func WithExemplarFromContext(fn ExemplarFromCtxFunc) Option {
+	return func(o *options) {
+		o.fn = fn
+	}
+}
+
+func WithRegisterer(reg prometheus.Registerer) Option {
+	return func(o *options) {
+		o.reg = reg
+	}
+}
+
+type options struct {
+	copts []grpc_prometheus.CounterOption
+	hopts []grpc_prometheus.HistogramOption
+	fn    func(ctx context.Context) prometheus.Labels
+	reg   prometheus.Registerer
+}
+
+func (o *options) apply(opts ...Option) *options {
+	for _, v := range opts {
+		v(o)
+	}
+	if o.reg == nil {
+		o.reg = prometheus.DefaultRegisterer
+	}
+	return o
+}