move hooks

hooks/validator/validator.go

@@ -0,0 +1,194 @@
+package validator
+
+import (
+	"context"
+
+	"go.unistack.org/micro/v3/client"
+	"go.unistack.org/micro/v3/errors"
+	"go.unistack.org/micro/v3/server"
+)
+
+var (
+	DefaultClientErrorFunc = func(req client.Request, rsp interface{}, err error) error {
+		if rsp != nil {
+			return errors.BadGateway(req.Service(), "%v", err)
+		}
+		return errors.BadRequest(req.Service(), "%v", err)
+	}
+
+	DefaultServerErrorFunc = func(req server.Request, rsp interface{}, err error) error {
+		if rsp != nil {
+			return errors.BadGateway(req.Service(), "%v", err)
+		}
+		return errors.BadRequest(req.Service(), "%v", err)
+	}
+
+	DefaultPublishErrorFunc = func(msg client.Message, err error) error {
+		return errors.BadRequest(msg.Topic(), "%v", err)
+	}
+
+	DefaultSubscribeErrorFunc = func(msg server.Message, err error) error {
+		return errors.BadRequest(msg.Topic(), "%v", err)
+	}
+)
+
+type (
+	ClientErrorFunc    func(client.Request, interface{}, error) error
+	ServerErrorFunc    func(server.Request, interface{}, error) error
+	PublishErrorFunc   func(client.Message, error) error
+	SubscribeErrorFunc func(server.Message, error) error
+)
+
+// Options struct holds wrapper options
+type Options struct {
+	ClientErrorFn          ClientErrorFunc
+	ServerErrorFn          ServerErrorFunc
+	PublishErrorFn         PublishErrorFunc
+	SubscribeErrorFn       SubscribeErrorFunc
+	ClientValidateResponse bool
+	ServerValidateResponse bool
+}
+
+// Option func signature
+type Option func(*Options)
+
+func ClientValidateResponse(b bool) Option {
+	return func(o *Options) {
+		o.ClientValidateResponse = b
+	}
+}
+
+func ServerValidateResponse(b bool) Option {
+	return func(o *Options) {
+		o.ClientValidateResponse = b
+	}
+}
+
+func ClientReqErrorFn(fn ClientErrorFunc) Option {
+	return func(o *Options) {
+		o.ClientErrorFn = fn
+	}
+}
+
+func ServerErrorFn(fn ServerErrorFunc) Option {
+	return func(o *Options) {
+		o.ServerErrorFn = fn
+	}
+}
+
+func PublishErrorFn(fn PublishErrorFunc) Option {
+	return func(o *Options) {
+		o.PublishErrorFn = fn
+	}
+}
+
+func SubscribeErrorFn(fn SubscribeErrorFunc) Option {
+	return func(o *Options) {
+		o.SubscribeErrorFn = fn
+	}
+}
+
+func NewOptions(opts ...Option) Options {
+	options := Options{
+		ClientErrorFn:    DefaultClientErrorFunc,
+		ServerErrorFn:    DefaultServerErrorFunc,
+		PublishErrorFn:   DefaultPublishErrorFunc,
+		SubscribeErrorFn: DefaultSubscribeErrorFunc,
+	}
+	for _, o := range opts {
+		o(&options)
+	}
+	return options
+}
+
+func NewHook(opts ...Option) *hook {
+	return &hook{opts: NewOptions(opts...)}
+}
+
+type validator interface {
+	Validate() error
+}
+
+type hook struct {
+	opts Options
+}
+
+func (w *hook) ClientCall(next client.FuncCall) client.FuncCall {
+	return func(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
+		if v, ok := req.Body().(validator); ok {
+			if err := v.Validate(); err != nil {
+				return w.opts.ClientErrorFn(req, nil, err)
+			}
+		}
+		err := next(ctx, req, rsp, opts...)
+		if v, ok := rsp.(validator); ok && w.opts.ClientValidateResponse {
+			if verr := v.Validate(); verr != nil {
+				return w.opts.ClientErrorFn(req, rsp, verr)
+			}
+		}
+		return err
+	}
+}
+
+func (w *hook) ClientStream(next client.FuncStream) client.FuncStream {
+	return func(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
+		if v, ok := req.Body().(validator); ok {
+			if err := v.Validate(); err != nil {
+				return nil, w.opts.ClientErrorFn(req, nil, err)
+			}
+		}
+		return next(ctx, req, opts...)
+	}
+}
+
+func (w *hook) ClientPublish(next client.FuncPublish) client.FuncPublish {
+	return func(ctx context.Context, msg client.Message, opts ...client.PublishOption) error {
+		if v, ok := msg.Payload().(validator); ok {
+			if err := v.Validate(); err != nil {
+				return w.opts.PublishErrorFn(msg, err)
+			}
+		}
+		return next(ctx, msg, opts...)
+	}
+}
+
+func (w *hook) ClientBatchPublish(next client.FuncBatchPublish) client.FuncBatchPublish {
+	return func(ctx context.Context, msgs []client.Message, opts ...client.PublishOption) error {
+		for _, msg := range msgs {
+			if v, ok := msg.Payload().(validator); ok {
+				if err := v.Validate(); err != nil {
+					return w.opts.PublishErrorFn(msg, err)
+				}
+			}
+		}
+		return next(ctx, msgs, opts...)
+	}
+}
+
+func (w *hook) ServerHandler(next server.FuncHandler) server.FuncHandler {
+	return func(ctx context.Context, req server.Request, rsp interface{}) error {
+		if v, ok := req.Body().(validator); ok {
+			if err := v.Validate(); err != nil {
+				return w.opts.ServerErrorFn(req, nil, err)
+			}
+		}
+		err := next(ctx, req, rsp)
+		if v, ok := rsp.(validator); ok && w.opts.ServerValidateResponse {
+			if verr := v.Validate(); verr != nil {
+				return w.opts.ServerErrorFn(req, rsp, verr)
+			}
+		}
+		return err
+	}
+}
+
+func (w *hook) ServerSubscriber(next server.FuncSubHandler) server.FuncSubHandler {
+	return func(ctx context.Context, msg server.Message) error {
+		if v, ok := msg.Body().(validator); ok {
+			if err := v.Validate(); err != nil {
+				return w.opts.SubscribeErrorFn(msg, err)
+			}
+		}
+		return next(ctx, msg)
+	}
+}