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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package autoexport // import "go.opentelemetry.io/contrib/exporters/autoexport"
import (
"context"
"os"
)
type signal[T any] struct {
envKey string
registry *registry[T]
}
func newSignal[T any](envKey string) signal[T] {
return signal[T]{
envKey: envKey,
registry: ®istry[T]{
names: make(map[string]func(context.Context) (T, error)),
},
}
}
func (s signal[T]) create(ctx context.Context, opts ...option[T]) (T, error) {
var cfg config[T]
for _, opt := range opts {
opt.apply(&cfg)
}
expType := os.Getenv(s.envKey)
if expType == "" {
if cfg.fallbackFactory != nil {
return cfg.fallbackFactory(ctx)
}
expType = "otlp"
}
return s.registry.load(ctx, expType)
}
type config[T any] struct {
fallbackFactory func(ctx context.Context) (T, error)
}
type option[T any] interface {
apply(cfg *config[T])
}
type optionFunc[T any] func(cfg *config[T])
//lint:ignore U1000 https://github.com/dominikh/go-tools/issues/1440
func (fn optionFunc[T]) apply(cfg *config[T]) {
fn(cfg)
}
func withFallbackFactory[T any](fallbackFactory func(ctx context.Context) (T, error)) option[T] {
return optionFunc[T](func(cfg *config[T]) {
cfg.fallbackFactory = fallbackFactory
})
}
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