/
config.go
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/
config.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.
//go:build go1.18
// +build go1.18
package stdoutmetric // import "go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
import (
"encoding/json"
"os"
)
// config contains options for the exporter.
type config struct {
encoder *encoderHolder
}
// newConfig creates a validated config configured with options.
func newConfig(options ...Option) config {
cfg := config{}
for _, opt := range options {
cfg = opt.apply(cfg)
}
if cfg.encoder == nil {
enc := json.NewEncoder(os.Stdout)
enc.SetIndent("", "\t")
cfg.encoder = &encoderHolder{encoder: enc}
}
return cfg
}
// Option sets exporter option values.
type Option interface {
apply(config) config
}
type optionFunc func(config) config
func (o optionFunc) apply(c config) config {
return o(c)
}
// WithEncoder sets the exporter to use encoder to encode all the metric
// data-types to an output.
func WithEncoder(encoder Encoder) Option {
return optionFunc(func(c config) config {
if encoder != nil {
c.encoder = &encoderHolder{encoder: encoder}
}
return c
})
}