97 lines
1.9 KiB
Go
97 lines
1.9 KiB
Go
package config
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import (
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"context"
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"fmt"
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"sync"
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"sync/atomic"
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)
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func WrapFactory(fn Factory, prov Provider) *WrapProvider {
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return &WrapProvider{
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factory: func(ctx context.Context) (Provider, error) {
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return fn.Create(ctx, prov)
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},
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mu: sync.Mutex{},
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done: 0,
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provider: nil,
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name: fn.Name(),
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}
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}
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type WrapProvider struct {
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mu sync.Mutex
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done uint32
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provider Provider
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factory func(ctx context.Context) (Provider, error)
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name string
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}
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func (p *WrapProvider) Watch(ctx context.Context, callback WatchCallback, path ...string) error {
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if err := p.init(ctx); err != nil {
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return fmt.Errorf("init read:%w", err)
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}
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watch, ok := p.provider.(WatchProvider)
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if !ok {
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return nil
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}
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if err := watch.Watch(ctx, callback, path...); err != nil {
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return fmt.Errorf("factory provider: %w", err)
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}
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return nil
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}
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func (p *WrapProvider) Value(ctx context.Context, path ...string) (Value, error) {
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if err := p.init(ctx); err != nil {
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return nil, fmt.Errorf("init read:%w", err)
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}
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variable, err := p.provider.Value(ctx, path...)
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if err != nil {
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return nil, fmt.Errorf("factory provider: %w", err)
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}
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return variable, nil
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}
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func (p *WrapProvider) Name() string {
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return p.name
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}
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func (p *WrapProvider) Bind(ctx context.Context, data Variables) error {
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if err := p.init(ctx); err != nil {
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return fmt.Errorf("init bind: %w", err)
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}
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prov, ok := p.provider.(BindProvider)
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if !ok {
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return nil
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}
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if perr := prov.Bind(ctx, data); perr != nil {
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return fmt.Errorf("init bind provider: %w", perr)
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}
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return nil
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}
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func (p *WrapProvider) init(ctx context.Context) error {
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if atomic.LoadUint32(&p.done) == 0 {
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if !p.mu.TryLock() {
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return fmt.Errorf("%w", ErrInitFactory)
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}
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defer atomic.StoreUint32(&p.done, 1)
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defer p.mu.Unlock()
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var err error
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if p.provider, err = p.factory(ctx); err != nil {
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return fmt.Errorf("init provider factory:%w", err)
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}
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}
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return nil
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}
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