micro/config/config.go

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// Package config is an interface for dynamic configuration.
package config
import (
"context"
"errors"
"time"
)
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// DefaultConfig default config
var DefaultConfig Config = NewConfig()
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// DefaultWatcherMinInterval default min interval for poll changes
var DefaultWatcherMinInterval = 5 * time.Second
// DefaultWatcherMaxInterval default max interval for poll changes
var DefaultWatcherMaxInterval = 9 * time.Second
var (
// ErrCodecMissing is returned when codec needed and not specified
ErrCodecMissing = errors.New("codec missing")
// ErrInvalidStruct is returned when the target struct is invalid
ErrInvalidStruct = errors.New("invalid struct specified")
// ErrWatcherStopped is returned when source watcher has been stopped
ErrWatcherStopped = errors.New("watcher stopped")
)
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// Config is an interface abstraction for dynamic configuration
type Config interface {
// Name returns name of config
Name() string
// Init the config
Init(opts ...Option) error
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// Options in the config
Options() Options
// Load config from sources
Load(context.Context, ...LoadOption) error
// Save config to sources
Save(context.Context, ...SaveOption) error
// Watch a config for changes
Watch(context.Context, ...WatchOption) (Watcher, error)
// String returns config type name
String() string
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}
// Watcher is the config watcher
type Watcher interface {
// Next blocks until update happens or error returned
Next() (map[string]interface{}, error)
// Stop stops watcher
Stop() error
}
// Load loads config from config sources
func Load(ctx context.Context, cs []Config, opts ...LoadOption) error {
var err error
for _, c := range cs {
if err = c.Init(); err != nil {
return err
}
if err = c.Load(ctx, opts...); err != nil {
return err
}
}
return nil
}