github.com/aacfactory/fns@v1.2.86-0.20240310083819-80d667fc0a17/services/tracings/context.go (about)

     1  /*
     2   * Copyright 2023 Wang Min Xiang
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   * 	http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   *
    16   */
    17  
    18  package tracings
    19  
    20  import "github.com/aacfactory/fns/context"
    21  
    22  var (
    23  	contextKey = []byte("@fns:context:tracings")
    24  )
    25  
    26  func With(ctx context.Context, trace *Tracer) {
    27  	ctx.SetLocalValue(contextKey, trace)
    28  }
    29  
    30  func Load(ctx context.Context) (trace *Tracer, found bool) {
    31  	v := ctx.LocalValue(contextKey)
    32  	if v == nil {
    33  		return
    34  	}
    35  	trace, found = v.(*Tracer)
    36  	return
    37  }