41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
package meter
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import (
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"fmt"
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"strings"
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"github.com/evcc-io/evcc/api"
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)
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type meterRegistry map[string]func(map[string]interface{}) (api.Meter, error)
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func (r meterRegistry) Add(name string, factory func(map[string]interface{}) (api.Meter, error)) {
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if _, exists := r[name]; exists {
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panic(fmt.Sprintf("cannot register duplicate meter type: %s", name))
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}
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r[name] = factory
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}
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func (r meterRegistry) Get(name string) (func(map[string]interface{}) (api.Meter, error), error) {
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factory, exists := r[name]
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if !exists {
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return nil, fmt.Errorf("meter type not registered: %s", name)
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}
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return factory, nil
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}
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var registry meterRegistry = make(map[string]func(map[string]interface{}) (api.Meter, error))
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// NewFromConfig creates meter from configuration
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func NewFromConfig(typ string, other map[string]interface{}) (v api.Meter, err error) {
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factory, err := registry.Get(strings.ToLower(typ))
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if err == nil {
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if v, err = factory(other); err != nil {
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err = fmt.Errorf("cannot create meter '%s': %w", typ, err)
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}
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} else {
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err = fmt.Errorf("invalid meter type: %s", typ)
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}
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return
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}
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