74 lines
2.3 KiB
Go
74 lines
2.3 KiB
Go
// Copyright 2018-2021 CERN
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// In applying this license, CERN does not waive the privileges and immunities
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// granted to it by virtue of its status as an Intergovernmental Organization
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// or submit itself to any jurisdiction.
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package appctx
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import (
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"context"
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"reflect"
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"unsafe"
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)
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// PutKeyValuesToCtx puts all the key-value pairs from the provided map to a background context.
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func PutKeyValuesToCtx(m map[interface{}]interface{}) context.Context {
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ctx := context.Background()
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for key, value := range m {
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ctx = context.WithValue(ctx, key, value)
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}
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return ctx
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}
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// GetKeyValuesFromCtx retrieves all the key-value pairs from the provided context.
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func GetKeyValuesFromCtx(ctx context.Context) map[interface{}]interface{} {
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m := make(map[interface{}]interface{})
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getKeyValue(ctx, m)
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return m
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}
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func getKeyValue(ctx interface{}, m map[interface{}]interface{}) {
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// This is a dirty hack to run with go 1.21.x
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reflectCtxValues := reflect.ValueOf(ctx)
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if reflectCtxValues.Kind() != reflect.Struct {
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ctxVals := reflectCtxValues.Elem()
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ctxType := reflect.TypeOf(ctx).Elem()
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if ctxType.Kind() == reflect.Struct {
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for i := 0; i < ctxVals.NumField(); i++ {
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currField, currIf := extractField(ctxVals, ctxType, i)
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switch currField {
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case "Context":
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getKeyValue(currIf, m)
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case "key":
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nextField, nextIf := extractField(ctxVals, ctxType, i+1)
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if nextField == "val" {
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m[currIf] = nextIf
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i++
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}
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}
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}
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}
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}
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}
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func extractField(vals reflect.Value, fieldType reflect.Type, pos int) (string, interface{}) {
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currVal := vals.Field(pos)
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currVal = reflect.NewAt(currVal.Type(), unsafe.Pointer(currVal.UnsafeAddr())).Elem()
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currField := fieldType.Field(pos)
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return currField.Name, currVal.Interface()
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}
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