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receiver.go
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receiver.go
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package receiver
import (
"fmt"
)
func Hello(name string) (str string, err error) {
g := greeter{}
return g.greet(name), nil
}
type greeter struct {
phrase string
}
func (g *greeter) greet(name string) string {
return fmt.Sprintf("%s %s", g.phrase, name)
}
type Provider struct {
greeter *greeter
}
func (p *Provider) Hello(name string) (str string, err error) {
return p.greeter.greet(name), nil
}
func NewProvider(getEnv func(string) string) (p *Provider, err error) {
phrase := "Hello brah"
if p := getEnv("DEFAULT_PHRASE"); p != "" {
phrase = p
}
return &Provider{&greeter{phrase}}, nil
}
type User struct {
Name string
greeter *greeter
}
func NewUser(p *Provider, name string, getHeader func(string) string) (user *User, err error) {
g := p.greeter
if phrase := getHeader("Hello-Phrase"); phrase != "" {
g = &greeter{phrase}
}
return &User{
Name: name,
greeter: g,
}, nil
}
func (user *User) Hello(text string) (greeting string, err error) {
return user.greeter.greet(user.Name + ": " + text), nil
}
type Guest struct{}
func (guest *Guest) Hello() (greeting string, err error) {
return "Hello guest", nil
}