github.com/matrixorigin/matrixone@v1.2.0/pkg/util/trace/impl/motrace/context.go (about)

     1  // Copyright 2022 Matrix Origin
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package motrace
    16  
    17  import "context"
    18  
    19  type stmContextKeyType int
    20  
    21  const currentStmKey stmContextKeyType = iota
    22  
    23  func ContextWithStatement(parent context.Context, s *StatementInfo) context.Context {
    24  	return context.WithValue(parent, currentStmKey, s)
    25  }
    26  
    27  func StatementFromContext(ctx context.Context) *StatementInfo {
    28  	if ctx == nil {
    29  		return nil
    30  	} else if val := ctx.Value(currentStmKey); val == nil {
    31  		return nil
    32  	} else if stm, ok := val.(*StatementInfo); !ok {
    33  		return nil
    34  	} else {
    35  		return stm
    36  	}
    37  }