/
configs.go
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/
configs.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/otelcol/internal/configunmarshaler"
import (
"fmt"
"reflect"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/confmap"
)
type Configs[F component.Factory] struct {
cfgs map[component.ID]component.Config
factories map[component.Type]F
}
func NewConfigs[F component.Factory](factories map[component.Type]F) *Configs[F] {
return &Configs[F]{factories: factories}
}
func (c *Configs[F]) Unmarshal(conf *confmap.Conf) error {
rawCfgs := make(map[component.ID]map[string]interface{})
if err := conf.Unmarshal(&rawCfgs, confmap.WithErrorUnused()); err != nil {
return err
}
// Prepare resulting map.
c.cfgs = make(map[component.ID]component.Config)
// Iterate over raw configs and create a config for each.
for id, value := range rawCfgs {
// Find factory based on component kind and type that we read from config source.
factory, ok := c.factories[id.Type()]
if !ok {
return errorUnknownType(id, reflect.ValueOf(c.factories).MapKeys())
}
// Create the default config for this component.
cfg := factory.CreateDefaultConfig()
// 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.UnmarshalConfig(confmap.NewFromStringMap(value), cfg); err != nil {
return errorUnmarshalError(id, err)
}
c.cfgs[id] = cfg
}
return nil
}
func (c *Configs[F]) Configs() map[component.ID]component.Config {
return c.cfgs
}
func errorUnknownType(id component.ID, factories []reflect.Value) error {
return fmt.Errorf("unknown type: %q for id: %q (valid values: %v)", id.Type(), id, factories)
}
func errorUnmarshalError(id component.ID, err error) error {
return fmt.Errorf("error reading configuration for %q: %w", id, err)
}