docdb/internal/clientconn/conninfo/ctx.go

// Copyright 2021 Hanzo AI Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package conninfo

import "context"

// contextKey is a named unexported type for the safe use of [context.WithValue].
type contextKey struct{}

// Context key for [Ctx]/[Get].
var connInfoKey = contextKey{}

// Ctx returns a derived context with the given ConnInfo.
func Ctx(ctx context.Context, connInfo *ConnInfo) context.Context {
	return context.WithValue(ctx, connInfoKey, connInfo)
}

// Get returns the ConnInfo value stored in ctx.
func Get(ctx context.Context) *ConnInfo {
	value := ctx.Value(connInfoKey)
	if value == nil {
		panic("connInfo is not set in context")
	}

	connInfo, ok := value.(*ConnInfo)
	if !ok {
		panic("connInfo is set in context with wrong value type")
	}

	if connInfo == nil {
		panic("connInfo is set in context with nil value")
	}

	return connInfo
}