/
config.go
119 lines (99 loc) · 3.4 KB
/
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.
package stdoutmetric // import "go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
import (
"encoding/json"
"os"
"go.opentelemetry.io/otel/sdk/metric"
)
// config contains options for the exporter.
type config struct {
encoder *encoderHolder
temporalitySelector metric.TemporalitySelector
aggregationSelector metric.AggregationSelector
redactTimestamps bool
}
// 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}
}
if cfg.temporalitySelector == nil {
cfg.temporalitySelector = metric.DefaultTemporalitySelector
}
if cfg.aggregationSelector == nil {
cfg.aggregationSelector = metric.DefaultAggregationSelector
}
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
})
}
// WithTemporalitySelector sets the TemporalitySelector the exporter will use
// to determine the Temporality of an instrument based on its kind. If this
// option is not used, the exporter will use the DefaultTemporalitySelector
// from the go.opentelemetry.io/otel/sdk/metric package.
func WithTemporalitySelector(selector metric.TemporalitySelector) Option {
return temporalitySelectorOption{selector: selector}
}
type temporalitySelectorOption struct {
selector metric.TemporalitySelector
}
func (t temporalitySelectorOption) apply(c config) config {
c.temporalitySelector = t.selector
return c
}
// WithAggregationSelector sets the AggregationSelector the exporter will use
// to determine the aggregation to use for an instrument based on its kind. If
// this option is not used, the exporter will use the
// DefaultAggregationSelector from the go.opentelemetry.io/otel/sdk/metric
// package or the aggregation explicitly passed for a view matching an
// instrument.
func WithAggregationSelector(selector metric.AggregationSelector) Option {
return aggregationSelectorOption{selector: selector}
}
type aggregationSelectorOption struct {
selector metric.AggregationSelector
}
func (t aggregationSelectorOption) apply(c config) config {
c.aggregationSelector = t.selector
return c
}
// WithoutTimestamps sets all timestamps to zero in the output stream.
func WithoutTimestamps() Option {
return optionFunc(func(c config) config {
c.redactTimestamps = true
return c
})
}