forked from TrueCloudLab/distribution
74 lines
1.7 KiB
Go
74 lines
1.7 KiB
Go
// 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 autoexport // import "go.opentelemetry.io/contrib/exporters/autoexport"
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import (
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"context"
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"os"
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)
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type signal[T any] struct {
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envKey string
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registry *registry[T]
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}
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func newSignal[T any](envKey string) signal[T] {
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return signal[T]{
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envKey: envKey,
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registry: ®istry[T]{
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names: make(map[string]func(context.Context) (T, error)),
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},
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}
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}
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func (s signal[T]) create(ctx context.Context, opts ...option[T]) (T, error) {
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var cfg config[T]
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for _, opt := range opts {
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opt.apply(&cfg)
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}
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expType := os.Getenv(s.envKey)
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if expType == "" {
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if cfg.hasFallback {
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return cfg.fallback, nil
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}
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expType = "otlp"
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}
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return s.registry.load(ctx, expType)
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}
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type config[T any] struct {
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hasFallback bool
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fallback T
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}
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type option[T any] interface {
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apply(cfg *config[T])
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}
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type optionFunc[T any] func(cfg *config[T])
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//lint:ignore U1000 https://github.com/dominikh/go-tools/issues/1440
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func (fn optionFunc[T]) apply(cfg *config[T]) {
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fn(cfg)
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}
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func withFallback[T any](fallback T) option[T] {
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return optionFunc[T](func(cfg *config[T]) {
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cfg.hasFallback = true
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cfg.fallback = fallback
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})
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}
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