118 lines
2.8 KiB
Go
118 lines
2.8 KiB
Go
package metadata
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import (
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"context"
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"go.unistack.org/micro/v4/client"
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"go.unistack.org/micro/v4/metadata"
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"go.unistack.org/micro/v4/server"
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)
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type wrapper struct {
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keys []string
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client.Client
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}
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func NewClientWrapper(keys ...string) client.Wrapper {
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return func(c client.Client) client.Client {
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handler := &wrapper{
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Client: c,
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keys: keys,
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}
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return handler
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}
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}
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func NewClientCallWrapper(keys ...string) client.CallWrapper {
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return func(fn client.CallFunc) client.CallFunc {
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return func(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions) error {
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if keys == nil {
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return fn(ctx, addr, req, rsp, opts)
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}
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if imd, iok := metadata.FromIncomingContext(ctx); iok && imd != nil {
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omd, ook := metadata.FromOutgoingContext(ctx)
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if !ook || omd == nil {
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omd = metadata.New(len(imd))
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}
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for _, k := range keys {
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if v := imd.Get(k); v != nil {
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omd.Add(k, v...)
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}
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}
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if !ook {
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ctx = metadata.NewOutgoingContext(ctx, omd)
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}
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}
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return fn(ctx, addr, req, rsp, opts)
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}
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}
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}
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func (w *wrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
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if w.keys == nil {
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return w.Client.Call(ctx, req, rsp, opts...)
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}
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if imd, iok := metadata.FromIncomingContext(ctx); iok && imd != nil {
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omd, ook := metadata.FromOutgoingContext(ctx)
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if !ook || omd == nil {
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omd = metadata.New(len(imd))
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}
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for _, k := range w.keys {
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if v := imd.Get(k); v != nil {
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omd.Add(k, v...)
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}
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}
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if !ook {
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ctx = metadata.NewOutgoingContext(ctx, omd)
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}
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}
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return w.Client.Call(ctx, req, rsp, opts...)
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}
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func (w *wrapper) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
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if w.keys == nil {
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return w.Client.Stream(ctx, req, opts...)
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}
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if imd, iok := metadata.FromIncomingContext(ctx); iok && imd != nil {
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omd, ook := metadata.FromOutgoingContext(ctx)
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if !ook || omd == nil {
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omd = metadata.New(len(imd))
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}
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for _, k := range w.keys {
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if v := imd.Get(k); v != nil {
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omd.Add(k, v...)
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}
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}
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if !ook {
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ctx = metadata.NewOutgoingContext(ctx, omd)
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}
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}
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return w.Client.Stream(ctx, req, opts...)
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}
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func NewServerHandlerWrapper(keys ...string) server.HandlerWrapper {
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return func(fn server.HandlerFunc) server.HandlerFunc {
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return func(ctx context.Context, req server.Request, rsp interface{}) error {
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if keys == nil {
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return fn(ctx, req, rsp)
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}
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if imd, iok := metadata.FromIncomingContext(ctx); iok && imd != nil {
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omd, ook := metadata.FromOutgoingContext(ctx)
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if !ook || omd == nil {
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omd = metadata.New(len(imd))
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}
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for _, k := range keys {
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if v := imd.Get(k); v != nil {
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omd.Add(k, v...)
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}
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}
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if !ook {
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ctx = metadata.NewOutgoingContext(ctx, omd)
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}
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}
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return fn(ctx, req, rsp)
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}
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}
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}
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