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ctxmap.go
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ctxmap.go
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// Copyright 2018-2021 CERN
//
// 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.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package appctx
import (
"context"
"reflect"
"unsafe"
)
// PutKeyValuesToCtx puts all the key-value pairs from the provided map to a background context.
func PutKeyValuesToCtx(m map[interface{}]interface{}) context.Context {
ctx := context.Background()
for key, value := range m {
ctx = context.WithValue(ctx, key, value)
}
return ctx
}
// GetKeyValuesFromCtx retrieves all the key-value pairs from the provided context.
func GetKeyValuesFromCtx(ctx context.Context) map[interface{}]interface{} {
m := make(map[interface{}]interface{})
getKeyValue(ctx, m)
return m
}
func getKeyValue(ctx interface{}, m map[interface{}]interface{}) {
ctxVals := reflect.ValueOf(ctx).Elem()
ctxType := reflect.TypeOf(ctx).Elem()
if ctxType.Kind() == reflect.Struct {
for i := 0; i < ctxVals.NumField(); i++ {
currField, currIf := extractField(ctxVals, ctxType, i)
switch currField {
case "Context":
getKeyValue(currIf, m)
case "key":
nextField, nextIf := extractField(ctxVals, ctxType, i+1)
if nextField == "val" {
m[currIf] = nextIf
i++
}
}
}
}
}
func extractField(vals reflect.Value, fieldType reflect.Type, pos int) (string, interface{}) {
currVal := vals.Field(pos)
currVal = reflect.NewAt(currVal.Type(), unsafe.Pointer(currVal.UnsafeAddr())).Elem()
currField := fieldType.Field(pos)
return currField.Name, currVal.Interface()
}