/
config_source_provider.go
132 lines (114 loc) · 3.61 KB
/
config_source_provider.go
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// Copyright Splunk, Inc.
// Copyright The OpenTelemetry 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 configprovider
import (
"context"
"fmt"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/confmap"
"go.uber.org/zap"
)
var (
_ confmap.Provider = (*configSourceConfigMapProvider)(nil)
)
type Hook interface {
OnNew()
OnRetrieve(scheme string, retrieved map[string]any)
OnShutdown()
}
type configSourceConfigMapProvider struct {
logger *zap.Logger
hooks []Hook
wrappedProvider confmap.Provider
wrappedRetrieved *confmap.Retrieved
buildInfo component.BuildInfo
factories []Factory
}
// NewConfigSourceConfigMapProvider creates a ParserProvider that uses config sources.
func NewConfigSourceConfigMapProvider(wrappedProvider confmap.Provider, logger *zap.Logger,
buildInfo component.BuildInfo, hooks []Hook, factories ...Factory) confmap.Provider {
for _, h := range hooks {
h.OnNew()
}
return &configSourceConfigMapProvider{
hooks: hooks,
wrappedProvider: wrappedProvider,
logger: logger,
factories: factories,
buildInfo: buildInfo,
wrappedRetrieved: &confmap.Retrieved{},
}
}
func (c *configSourceConfigMapProvider) Retrieve(ctx context.Context, uri string, onChange confmap.WatcherFunc) (*confmap.Retrieved, error) {
var tmpWR *confmap.Retrieved
var err error
newWrappedRetrieved := &confmap.Retrieved{}
if tmpWR, err = c.wrappedProvider.Retrieve(ctx, uri, onChange); err != nil {
return nil, err
} else if tmpWR != nil {
newWrappedRetrieved = tmpWR
}
existingMap, err := c.wrappedRetrieved.AsConf()
if err != nil {
return nil, err
}
// Need to merge config maps that we've encountered so far
if existingMap != nil {
wrMap, _ := newWrappedRetrieved.AsConf()
wrMap.Merge(existingMap)
if tmpWR, err = confmap.NewRetrieved(wrMap.ToStringMap()); err != nil {
return nil, err
} else if tmpWR != nil {
newWrappedRetrieved = tmpWR
}
}
c.wrappedRetrieved = newWrappedRetrieved
factories, err := makeFactoryMap(c.factories)
if err != nil {
return nil, err
}
wrappedMap, err := c.wrappedRetrieved.AsConf()
if err != nil {
return nil, err
}
scheme, stringMap := c.Scheme(), wrappedMap.ToStringMap()
for _, h := range c.hooks {
h.OnRetrieve(scheme, stringMap)
}
retrieved, closeFunc, err := Resolve(ctx, wrappedMap, c.logger, c.buildInfo, factories, onChange)
if err != nil {
return nil, err
}
return confmap.NewRetrieved(retrieved, confmap.WithRetrievedClose(mergeCloseFuncs([]confmap.CloseFunc{closeFunc, c.wrappedRetrieved.Close})))
}
func (c *configSourceConfigMapProvider) Scheme() string {
return c.wrappedProvider.Scheme()
}
func (c *configSourceConfigMapProvider) Shutdown(ctx context.Context) error {
for _, h := range c.hooks {
h.OnShutdown()
}
return c.wrappedProvider.Shutdown(ctx)
}
func makeFactoryMap(factories []Factory) (Factories, error) {
fMap := make(Factories)
for _, f := range factories {
if _, ok := fMap[f.Type()]; ok {
return nil, fmt.Errorf("duplicate config source factory %q", f.Type())
}
fMap[f.Type()] = f
}
return fMap, nil
}