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go-micro/metadata/metadata.go
2019-01-17 09:40:49 +00:00

31 lines
656 B
Go

// Package metadata is a way of defining message headers
package metadata
import (
"context"
)
type metaKey struct{}
// Metadata is our way of representing request headers internally.
// They're used at the RPC level and translate back and forth
// from Transport headers.
type Metadata map[string]string
func Copy(md Metadata) Metadata {
cmd := make(Metadata)
for k, v := range md {
cmd[k] = v
}
return cmd
}
func FromContext(ctx context.Context) (Metadata, bool) {
md, ok := ctx.Value(metaKey{}).(Metadata)
return md, ok
}
func NewContext(ctx context.Context, md Metadata) context.Context {
return context.WithValue(ctx, metaKey{}, md)
}