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01_interface.go
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/
01_interface.go
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package defining_depenency_injection
import (
"encoding/json"
"errors"
)
// Saver persists the supplied bytes
type Saver interface {
Save(data []byte) error
}
// SavePerson will validate and persist the supplied person
func SavePerson(person *Person, saver Saver) error {
// validate the inputs
err := person.validate()
if err != nil {
return err
}
// encode person to bytes
bytes, err := person.encode()
if err != nil {
return err
}
// save the person and return the result
return saver.Save(bytes)
}
// Person data object
type Person struct {
Name string
Phone string
}
// validate the person object
func (p *Person) validate() error {
if p.Name == "" {
return errors.New("name missing")
}
if p.Phone == "" {
return errors.New("phone missing")
}
return nil
}
// convert the person into bytes
func (p *Person) encode() ([]byte, error) {
return json.Marshal(p)
}