57 lines
1.8 KiB
Go
57 lines
1.8 KiB
Go
// Copyright 2022 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package rpc
|
|
|
|
import (
|
|
"context"
|
|
"net/http"
|
|
)
|
|
|
|
type mdHeaderKey struct{}
|
|
|
|
// NewContextWithHeaders wraps the given context, adding HTTP headers. These headers will
|
|
// be applied by Client when making a request using the returned context.
|
|
func NewContextWithHeaders(ctx context.Context, h http.Header) context.Context {
|
|
if len(h) == 0 {
|
|
// This check ensures the header map set in context will never be nil.
|
|
return ctx
|
|
}
|
|
|
|
var ctxh http.Header
|
|
prev, ok := ctx.Value(mdHeaderKey{}).(http.Header)
|
|
if ok {
|
|
ctxh = setHeaders(prev.Clone(), h)
|
|
} else {
|
|
ctxh = h.Clone()
|
|
}
|
|
return context.WithValue(ctx, mdHeaderKey{}, ctxh)
|
|
}
|
|
|
|
// headersFromContext is used to extract http.Header from context.
|
|
func headersFromContext(ctx context.Context) http.Header {
|
|
source, _ := ctx.Value(mdHeaderKey{}).(http.Header)
|
|
return source
|
|
}
|
|
|
|
// setHeaders sets all headers from src in dst.
|
|
func setHeaders(dst http.Header, src http.Header) http.Header {
|
|
for key, values := range src {
|
|
dst[http.CanonicalHeaderKey(key)] = values
|
|
}
|
|
return dst
|
|
}
|