87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package ttrpc
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import "context"
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// Headers represents the key-value pairs (similar to http.Header) to be passed to ttrpc server from a client.
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type Headers map[string]StringList
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// Get returns the headers for a given key when they exist.
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// If there are no headers, a nil slice and false are returned.
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func (h Headers) Get(key string) ([]string, bool) {
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list, ok := h[key]
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if !ok || len(list.List) == 0 {
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return nil, false
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}
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return list.List, true
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}
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// Set sets the provided values for a given key.
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// The values will overwrite any existing values.
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// If no values provided, a key will be deleted.
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func (h Headers) Set(key string, values ...string) {
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if len(values) == 0 {
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delete(h, key)
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return
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}
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h[key] = StringList{List: values}
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}
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// Append appends additional values to the given key.
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func (h Headers) Append(key string, values ...string) {
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if len(values) == 0 {
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return
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}
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list, ok := h[key]
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if ok {
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h.Set(key, append(list.List, values...)...)
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} else {
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h.Set(key, values...)
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}
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}
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type headerKey struct{}
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// GetHeaders retrieves headers from context.Context (previously attached with WithHeaders)
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func GetHeaders(ctx context.Context) (Headers, bool) {
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headers, ok := ctx.Value(headerKey{}).(Headers)
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return headers, ok
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}
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// GetHeader gets a specific header value by name from context.Context
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func GetHeader(ctx context.Context, name string) (string, bool) {
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headers, ok := GetHeaders(ctx)
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if !ok {
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return "", false
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}
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if list, ok := headers.Get(name); ok {
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return list[0], true
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}
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return "", false
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}
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// WithHeaders attaches headers map to a context.Context
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func WithHeaders(ctx context.Context, headers Headers) context.Context {
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return context.WithValue(ctx, headerKey{}, headers)
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}
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