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store.go
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store.go
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/*
Copyright 2019 The Knative Authors.
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 config
import (
"context"
"net/http"
"knative.dev/pkg/configmap"
tracingconfig "knative.dev/pkg/tracing/config"
)
type cfgKey struct{}
// Config is the configuration for the activator.
type Config struct {
Tracing *tracingconfig.Config
}
// FromContext obtains a Config injected into the passed context.
func FromContext(ctx context.Context) *Config {
return ctx.Value(cfgKey{}).(*Config)
}
func toContext(ctx context.Context, c *Config) context.Context {
return context.WithValue(ctx, cfgKey{}, c)
}
// Store loads/unloads our untyped configuration.
// +k8s:deepcopy-gen=false
type Store struct {
*configmap.UntypedStore
}
// NewStore creates a new configuration Store.
func NewStore(logger configmap.Logger, onAfterStore ...func(name string, value interface{})) *Store {
return &Store{
UntypedStore: configmap.NewUntypedStore(
"activator",
logger,
configmap.Constructors{
tracingconfig.ConfigName: tracingconfig.NewTracingConfigFromConfigMap,
},
onAfterStore...,
),
}
}
// ToContext stores the configuration Store in the passed context.
func (s *Store) ToContext(ctx context.Context) context.Context {
return toContext(ctx, s.Load())
}
// Load creates a Config for this store.
func (s *Store) Load() *Config {
return &Config{
Tracing: s.UntypedLoad(tracingconfig.ConfigName).(*tracingconfig.Config).DeepCopy(),
}
}
type storeMiddleware struct {
store *Store
next http.Handler
}
// ServeHTTP injects Config in to the context of the http request r.
func (mw *storeMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx := mw.store.ToContext(r.Context())
mw.next.ServeHTTP(w, r.WithContext(ctx))
}
// HTTPMiddleware is a middleware which stores the current config store in the request context.
func (s *Store) HTTPMiddleware(next http.Handler) http.Handler {
return &storeMiddleware{
store: s,
next: next,
}
}