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extensions.go
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extensions.go
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// 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 configunmarshaler // import "go.opentelemetry.io/collector/service/internal/configunmarshaler"
import (
"reflect"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/confmap"
)
// extensionsKeyName is the configuration key name for extensions section.
const extensionsKeyName = "extensions"
type Extensions struct {
exts map[component.ID]component.ExtensionConfig
factories map[component.Type]component.ExtensionFactory
}
func NewExtensions(factories map[component.Type]component.ExtensionFactory) *Extensions {
return &Extensions{factories: factories}
}
func (e *Extensions) Unmarshal(conf *confmap.Conf) error {
rawExts := make(map[component.ID]map[string]interface{})
if err := conf.Unmarshal(&rawExts, confmap.WithErrorUnused()); err != nil {
return err
}
// Prepare resulting map.
e.exts = make(map[component.ID]component.ExtensionConfig)
// Iterate over extensions and create a config for each.
for id, value := range rawExts {
// Find extension factory based on "type" that we read from config source.
factory, ok := e.factories[id.Type()]
if !ok {
return errorUnknownType(extensionsKeyName, id, reflect.ValueOf(e.factories).MapKeys())
}
// Create the default config for this extension.
extensionCfg := factory.CreateDefaultConfig()
extensionCfg.SetIDName(id.Name())
// Now that the default config struct is created we can Unmarshal into it,
// and it will apply user-defined config on top of the default.
if err := component.UnmarshalExtensionConfig(confmap.NewFromStringMap(value), extensionCfg); err != nil {
return errorUnmarshalError(extensionsKeyName, id, err)
}
e.exts[id] = extensionCfg
}
return nil
}
func (e *Extensions) GetExtensions() map[component.ID]component.ExtensionConfig {
return e.exts
}