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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 stdouttrace // import "go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
import (
"io"
"os"
)
var (
defaultWriter = os.Stdout
defaultPrettyPrint = false
defaultTimestamps = true
)
// config contains options for the STDOUT exporter.
type config struct {
// Writer is the destination. If not set, os.Stdout is used.
Writer io.Writer
// PrettyPrint will encode the output into readable JSON. Default is
// false.
PrettyPrint bool
// Timestamps specifies if timestamps should be printed. Default is
// true.
Timestamps bool
}
// newConfig creates a validated Config configured with options.
func newConfig(options ...Option) (config, error) {
cfg := config{
Writer: defaultWriter,
PrettyPrint: defaultPrettyPrint,
Timestamps: defaultTimestamps,
}
for _, opt := range options {
opt.apply(&cfg)
}
return cfg, nil
}
// Option sets the value of an option for a Config.
type Option interface {
apply(*config)
}
// WithWriter sets the export stream destination.
func WithWriter(w io.Writer) Option {
return writerOption{w}
}
type writerOption struct {
W io.Writer
}
func (o writerOption) apply(cfg *config) {
cfg.Writer = o.W
}
// WithPrettyPrint sets the export stream format to use JSON.
func WithPrettyPrint() Option {
return prettyPrintOption(true)
}
type prettyPrintOption bool
func (o prettyPrintOption) apply(cfg *config) {
cfg.PrettyPrint = bool(o)
}
// WithoutTimestamps sets the export stream to not include timestamps.
func WithoutTimestamps() Option {
return timestampsOption(false)
}
type timestampsOption bool
func (o timestampsOption) apply(cfg *config) {
cfg.Timestamps = bool(o)
}
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