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add337e0f7
This adds a way to specify HTTP headers per request. Co-authored-by: Martin Holst Swende <martin@swende.se> Co-authored-by: Felix Lange <fjl@twurst.com>
57 lines
1.8 KiB
Go
57 lines
1.8 KiB
Go
// Copyright 2022 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package rpc
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import (
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"context"
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"net/http"
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)
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type mdHeaderKey struct{}
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// NewContextWithHeaders wraps the given context, adding HTTP headers. These headers will
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// be applied by Client when making a request using the returned context.
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func NewContextWithHeaders(ctx context.Context, h http.Header) context.Context {
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if len(h) == 0 {
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// This check ensures the header map set in context will never be nil.
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return ctx
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}
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var ctxh http.Header
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prev, ok := ctx.Value(mdHeaderKey{}).(http.Header)
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if ok {
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ctxh = setHeaders(prev.Clone(), h)
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} else {
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ctxh = h.Clone()
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}
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return context.WithValue(ctx, mdHeaderKey{}, ctxh)
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}
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// headersFromContext is used to extract http.Header from context.
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func headersFromContext(ctx context.Context) http.Header {
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source, _ := ctx.Value(mdHeaderKey{}).(http.Header)
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return source
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}
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// setHeaders sets all headers from src in dst.
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func setHeaders(dst http.Header, src http.Header) http.Header {
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for key, values := range src {
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dst[http.CanonicalHeaderKey(key)] = values
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}
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return dst
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}
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