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144 lines
2.9 KiB
144 lines
2.9 KiB
package config
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import (
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"context"
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"errors"
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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 Must(providers ...interface{}) *Client {
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client, err := New(providers...)
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if err != nil {
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panic(err)
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}
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return client
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}
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func New(providers ...interface{}) (*Client, error) {
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client := &Client{
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providers: make([]Provider, len(providers)),
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}
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for idx, prov := range providers {
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switch current := prov.(type) {
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case Provider:
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client.providers[idx] = current
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case Factory:
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client.providers[idx] = &provider{
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factory: func(ctx context.Context) (Provider, error) {
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return current(ctx, client)
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},
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}
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default:
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return nil, fmt.Errorf("provier[%d]: %w %T", idx, ErrUnknowType, prov)
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}
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}
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return client, nil
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}
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type provider 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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}
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func (p *provider) 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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func (p *provider) 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 *provider) 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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type Client struct {
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providers []Provider
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}
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func (c *Client) Name() string {
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return "client"
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}
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// Value get value by name.
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func (c *Client) Value(ctx context.Context, path ...string) (Value, error) {
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var (
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value Value
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err error
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)
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for _, provider := range c.providers {
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value, err = provider.Value(ctx, path...)
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if err == nil || !(errors.Is(err, ErrValueNotFound) || errors.Is(err, ErrInitFactory)) {
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break
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}
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}
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if err != nil {
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return value, fmt.Errorf("client failed get value: %w", err)
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}
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return value, nil
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}
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func (c *Client) Watch(ctx context.Context, callback WatchCallback, path ...string) error {
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for idx, prov := range c.providers {
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provider, ok := prov.(WatchProvider)
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if !ok {
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continue
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}
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err := provider.Watch(ctx, callback, path...)
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if err != nil {
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if errors.Is(err, ErrValueNotFound) || errors.Is(err, ErrInitFactory) {
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continue
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}
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return fmt.Errorf("client: failed watch by provider[%d]: %w", idx, err)
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}
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}
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return nil
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}
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