/
factory.go
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/
factory.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 spanprocessor
import (
"context"
"errors"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/processor/processorhelper"
)
const (
// typeStr is the value of "type" Span processor in the configuration.
typeStr = "span"
)
var processorCapabilities = consumer.Capabilities{MutatesData: true}
// errMissingRequiredField is returned when a required field in the config
// is not specified.
// TODO https://github.com/open-telemetry/opentelemetry-collector/issues/215
// Move this to the error package that allows for span name and field to be specified.
var errMissingRequiredField = errors.New("error creating \"span\" processor: either \"from_attributes\" or \"to_attributes\" must be specified in \"name:\"")
// NewFactory returns a new factory for the Span processor.
func NewFactory() component.ProcessorFactory {
return processorhelper.NewFactory(
typeStr,
createDefaultConfig,
processorhelper.WithTraces(createTracesProcessor))
}
func createDefaultConfig() config.Processor {
return &Config{
ProcessorSettings: config.NewProcessorSettings(config.NewID(typeStr)),
}
}
func createTracesProcessor(
_ context.Context,
_ component.ProcessorCreateSettings,
cfg config.Processor,
nextConsumer consumer.Traces,
) (component.TracesProcessor, error) {
// 'from_attributes' or 'to_attributes' under 'name' has to be set for the span
// processor to be valid. If not set and not enforced, the processor would do no work.
oCfg := cfg.(*Config)
if len(oCfg.Rename.FromAttributes) == 0 &&
(oCfg.Rename.ToAttributes == nil || len(oCfg.Rename.ToAttributes.Rules) == 0) {
return nil, errMissingRequiredField
}
sp, err := newSpanProcessor(*oCfg)
if err != nil {
return nil, err
}
return processorhelper.NewTracesProcessor(
cfg,
nextConsumer,
sp.processTraces,
processorhelper.WithCapabilities(processorCapabilities))
}