move options to dedicated package

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

options/options.go

@@ -0,0 +1,196 @@
+package options
+
+import (
+	"context"
+	"crypto/tls"
+	"reflect"
+	"time"
+
+	"go.unistack.org/micro/v4/metadata"
+	rutil "go.unistack.org/micro/v4/util/reflect"
+)
+
+// Option func signature
+type Option func(interface{}) error
+
+// Set assign value to struct by its path
+func Set(src interface{}, dst interface{}, path string) error {
+	return rutil.SetFieldByPath(src, dst, path)
+}
+
+// Get returns value from struct by its path
+func Get(src interface{}, path string) (interface{}, error) {
+	return rutil.StructFieldByPath(src, path)
+}
+
+// Name set Name value
+func Name(v ...string) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Name")
+	}
+}
+
+// Address set Address value to single string or slice of strings
+func Address(v ...string) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Address")
+	}
+}
+
+// Broker set Broker value
+func Broker(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Broker")
+	}
+}
+
+// Logger set Logger value
+func Logger(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Logger")
+	}
+}
+
+// Meter set Meter value
+func Meter(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Meter")
+	}
+}
+
+// Tracer set Tracer value
+func Tracer(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Tracer")
+	}
+}
+
+// Store set Store value
+func Store(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Store")
+	}
+}
+
+// Register set Register value
+func Register(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Register")
+	}
+}
+
+// Router set Router value
+func Router(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Router")
+	}
+}
+
+// Codec set Codec value
+func Codec(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Codec")
+	}
+}
+
+// Client set Client value
+func Client(v interface{}) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Client")
+	}
+}
+
+// Codecs to be used to encode/decode requests for a given content type
+func Codecs(ct string, v interface{}) Option {
+	return func(src interface{}) error {
+		cm, err := Get(src, ".Codecs")
+		if err != nil {
+			return err
+		} else if rutil.IsZero(cm) {
+			cm = reflect.MakeMap(reflect.TypeOf(cm)).Interface()
+		}
+		cv := reflect.ValueOf(cm)
+		cv.SetMapIndex(reflect.ValueOf(ct), reflect.ValueOf(v))
+		return Set(src, cv.Interface(), ".Codecs")
+	}
+}
+
+// Context set Context value
+func Context(v context.Context) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".Context")
+	}
+}
+
+// TLSConfig set TLSConfig value
+func TLSConfig(v *tls.Config) Option {
+	return func(src interface{}) error {
+		return Set(src, v, ".TLSConfig")
+	}
+}
+
+func ContextOption(k, v interface{}) Option {
+	return func(src interface{}) error {
+		ctx, err := Get(src, ".Context")
+		if err != nil {
+			return err
+		}
+		if ctx == nil {
+			ctx = context.Background()
+		}
+		err = Set(src, context.WithValue(ctx.(context.Context), k, v), ".Context")
+		return err
+	}
+}
+
+// ContentType pass ContentType for message data
+func ContentType(ct string) Option {
+	return func(src interface{}) error {
+		return Set(src, ct, ".ContentType")
+	}
+}
+
+// Metadata pass additional metadata
+func Metadata(md metadata.Metadata) Option {
+	return func(src interface{}) error {
+		return Set(src, metadata.Copy(md), ".Metadata")
+	}
+}
+
+// Namespace to use
+func Namespace(ns string) Option {
+	return func(src interface{}) error {
+		return Set(src, ns, ".Namespace")
+	}
+}
+
+// Labels sets the labels
+func Labels(ls ...interface{}) Option {
+	return func(src interface{}) error {
+		v, err := Get(src, ".Labels")
+		if err != nil {
+			return err
+		} else if rutil.IsZero(v) {
+			v = reflect.MakeSlice(reflect.TypeOf(v), 0, len(ls)).Interface()
+		}
+		cv := reflect.ValueOf(v)
+		for _, l := range ls {
+			cv = reflect.Append(cv, reflect.ValueOf(l))
+		}
+		return Set(src, cv.Interface(), ".Labels")
+	}
+}
+
+// Timeout pass timeout time.Duration
+func Timeout(td time.Duration) Option {
+	return func(src interface{}) error {
+		return Set(src, td, ".Timeout")
+	}
+}
+
+// ID sets the step ID
+func StepID(id string) Option {
+	return func(src interface{}) error {
+		return Set(src, id, ".ID")
+	}
+}