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value.go
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/
value.go
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/*
* Copyright 2023 Wang Min Xiang
*
* 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 context
import (
"github.com/aacfactory/errors"
"github.com/aacfactory/fns/commons/objects"
)
func UserValue[T any](ctx Context, key []byte) (v T, has bool, err error) {
vv := ctx.UserValue(key)
if vv == nil {
return
}
v, has = vv.(T)
if has {
return
}
v, err = objects.Value[T](objects.New(vv))
if err != nil {
err = errors.Warning("fns: get context user value failed").WithCause(err).WithMeta("key", string(key))
return
}
has = true
return
}
func LocalValue[T any](ctx Context, key []byte) (v T, has bool) {
vv := ctx.LocalValue(key)
if vv == nil {
return
}
v, has = vv.(T)
return
}
func Value[T any](ctx Context, key any) (v T, has bool) {
vv := ctx.Value(key)
if vv == nil {
return
}
v, has = vv.(T)
return
}
type valueContext struct {
Context
key any
val any
}
func (c *valueContext) Value(key any) any {
if c.key == key {
return c.val
}
return c.Context.Value(key)
}