/
context_propagator.go
98 lines (76 loc) · 2.61 KB
/
context_propagator.go
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// Copyright © 2020 Banzai Cloud
//
// 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 cadence
import (
"context"
"emperror.dev/errors"
"go.uber.org/cadence/workflow"
)
// StringContextPropagator implements a custom workflow.ContextPropagator
// for passing a single string value to workflows and activities.
type StringContextPropagator struct {
// PropagationKey identifies a value in Cadence message headers.
PropagationKey string
// ContextKey identifies values in a context.
ContextKey interface{}
// Optional values will not emit an error when the key is missing from the context.
// Useful when you want to propagate handling missing values to a higher level.
Optional bool
}
func (s StringContextPropagator) Inject(ctx context.Context, writer workflow.HeaderWriter) error {
secretID, ok := ctx.Value(s.ContextKey).(string)
if !ok && !s.Optional {
return errors.Errorf("unable to extract key from context %v", s.ContextKey)
}
if !ok {
return nil
}
writer.Set(s.PropagationKey, []byte(secretID))
return nil
}
func (s StringContextPropagator) InjectFromWorkflow(ctx workflow.Context, writer workflow.HeaderWriter) error {
secretID, ok := ctx.Value(s.ContextKey).(string)
if !ok && !s.Optional {
return errors.Errorf("unable to extract key from context %v", s.ContextKey)
}
if !ok {
return nil
}
writer.Set(s.PropagationKey, []byte(secretID))
return nil
}
func (s StringContextPropagator) Extract(ctx context.Context, reader workflow.HeaderReader) (context.Context, error) {
if err := reader.ForEachKey(func(key string, value []byte) error {
if key == s.PropagationKey {
ctx = context.WithValue(ctx, s.ContextKey, string(value))
return nil
}
return nil
}); err != nil {
return nil, err
}
return ctx, nil
}
func (s StringContextPropagator) ExtractToWorkflow(ctx workflow.Context, reader workflow.HeaderReader) (workflow.Context, error) {
if err := reader.ForEachKey(func(key string, value []byte) error {
if key == s.PropagationKey {
ctx = workflow.WithValue(ctx, s.ContextKey, string(value))
return nil
}
return nil
}); err != nil {
return nil, err
}
return ctx, nil
}