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context.go
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context.go
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// The MIT License
//
// Copyright (c) 2021 Temporal Technologies Inc. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package plugin
import (
"context"
"encoding/gob"
"google.golang.org/grpc/metadata"
)
var (
grpcIncomingMDKey = "grpc-incoming"
grpcOutgoingMDKey = "grpc-outgoing"
)
type PluginSafeContext struct {
Values map[string]interface{}
}
func init() {
gob.Register(metadata.MD{})
}
func NewPluginSafeContext(ctx context.Context) PluginSafeContext {
values := map[string]interface{}{}
if md, ok := metadata.FromIncomingContext(ctx); ok {
values[grpcIncomingMDKey] = md
}
if md, ok := metadata.FromOutgoingContext(ctx); ok {
values[grpcOutgoingMDKey] = md
}
return PluginSafeContext{Values: values}
}
func (sCtx *PluginSafeContext) GetContext() context.Context {
ctx := context.Background()
if rv, ok := sCtx.Values[grpcIncomingMDKey]; ok {
if md, ok := rv.(metadata.MD); ok {
ctx = metadata.NewIncomingContext(ctx, md)
}
}
if rv, ok := sCtx.Values[grpcOutgoingMDKey]; ok {
if md, ok := rv.(metadata.MD); ok {
ctx = metadata.NewOutgoingContext(ctx, md)
}
}
return ctx
}