104 lines
2.2 KiB
Go
104 lines
2.2 KiB
Go
package requestid
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import (
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"context"
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"net/textproto"
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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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"go.unistack.org/micro/v4/util/id"
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)
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type XRequestIDKey struct{}
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// DefaultMetadataKey contains metadata key
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var DefaultMetadataKey = textproto.CanonicalMIMEHeaderKey("x-request-id")
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// DefaultMetadataFunc wil be used if user not provide own func to fill metadata
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var DefaultMetadataFunc = func(ctx context.Context) (context.Context, error) {
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var xid string
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cid, cok := ctx.Value(XRequestIDKey{}).(string)
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if cok && cid != "" {
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xid = cid
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}
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imd, iok := metadata.FromIncomingContext(ctx)
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if !iok || imd == nil {
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imd = metadata.New(1)
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ctx = metadata.NewIncomingContext(ctx, imd)
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}
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omd, ook := metadata.FromOutgoingContext(ctx)
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if !ook || omd == nil {
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omd = metadata.New(1)
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ctx = metadata.NewOutgoingContext(ctx, omd)
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}
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if xid == "" {
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xid = imd.GetJoined(DefaultMetadataKey)
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if xid == "" {
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xid = omd.GetJoined(DefaultMetadataKey)
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}
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}
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if xid == "" {
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var err error
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xid, err = id.New()
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if err != nil {
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return ctx, err
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}
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}
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if !cok {
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ctx = context.WithValue(ctx, XRequestIDKey{}, xid)
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}
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if !iok {
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imd.Set(DefaultMetadataKey, xid)
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}
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if !ook {
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omd.Set(DefaultMetadataKey, xid)
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}
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return ctx, nil
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}
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type hook struct{}
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func NewHook() *hook {
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return &hook{}
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}
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func (w *hook) ServerHandler(next server.FuncHandler) server.FuncHandler {
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return func(ctx context.Context, req server.Request, rsp interface{}) error {
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var err error
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if ctx, err = DefaultMetadataFunc(ctx); err != nil {
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return err
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}
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return next(ctx, req, rsp)
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}
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}
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func (w *hook) ClientCall(next client.FuncCall) client.FuncCall {
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return func(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
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var err error
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if ctx, err = DefaultMetadataFunc(ctx); err != nil {
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return err
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}
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return next(ctx, req, rsp, opts...)
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}
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}
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func (w *hook) ClientStream(next client.FuncStream) client.FuncStream {
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return func(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
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var err error
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if ctx, err = DefaultMetadataFunc(ctx); err != nil {
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return nil, err
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}
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return next(ctx, req, opts...)
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}
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}
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