115 lines
2.7 KiB
Go
115 lines
2.7 KiB
Go
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// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package stdoutmetric // import "go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
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import (
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"io"
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"os"
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"go.opentelemetry.io/otel/attribute"
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)
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var (
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defaultWriter = os.Stdout
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defaultPrettyPrint = false
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defaultTimestamps = true
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defaultLabelEncoder = attribute.DefaultEncoder()
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)
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// config contains options for the STDOUT exporter.
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type config struct {
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// Writer is the destination. If not set, os.Stdout is used.
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Writer io.Writer
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// PrettyPrint will encode the output into readable JSON. Default is
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// false.
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PrettyPrint bool
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// Timestamps specifies if timestamps should be printed. Default is
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// true.
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Timestamps bool
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// LabelEncoder encodes the labels.
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LabelEncoder attribute.Encoder
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}
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// newConfig creates a validated Config configured with options.
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func newConfig(options ...Option) (config, error) {
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cfg := config{
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Writer: defaultWriter,
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PrettyPrint: defaultPrettyPrint,
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Timestamps: defaultTimestamps,
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LabelEncoder: defaultLabelEncoder,
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}
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for _, opt := range options {
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opt.apply(&cfg)
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}
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return cfg, nil
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}
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// Option sets the value of an option for a Config.
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type Option interface {
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apply(*config)
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}
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// WithWriter sets the export stream destination.
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func WithWriter(w io.Writer) Option {
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return writerOption{w}
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}
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type writerOption struct {
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W io.Writer
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}
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func (o writerOption) apply(cfg *config) {
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cfg.Writer = o.W
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}
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// WithPrettyPrint sets the export stream format to use JSON.
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func WithPrettyPrint() Option {
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return prettyPrintOption(true)
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}
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type prettyPrintOption bool
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func (o prettyPrintOption) apply(cfg *config) {
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cfg.PrettyPrint = bool(o)
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}
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// WithoutTimestamps sets the export stream to not include timestamps.
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func WithoutTimestamps() Option {
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return timestampsOption(false)
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}
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type timestampsOption bool
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func (o timestampsOption) apply(cfg *config) {
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cfg.Timestamps = bool(o)
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}
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// WithLabelEncoder sets the label encoder used in export.
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func WithLabelEncoder(enc attribute.Encoder) Option {
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return labelEncoderOption{enc}
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}
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type labelEncoderOption struct {
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LabelEncoder attribute.Encoder
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}
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func (o labelEncoderOption) apply(cfg *config) {
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cfg.LabelEncoder = o.LabelEncoder
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}
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