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|
package toml_test
import (
"errors"
"fmt"
"net"
"time"
"github.com/naoina/toml"
)
// This example shows how the UnmarshalerRec interface can be used to apply field
// validations and default values.
type Server struct {
Addr string // "<host>:<port>"
Timeout time.Duration // defaults to 10s
}
// UnmarshalTOML implements toml.Unmarshaler.
func (s *Server) UnmarshalTOML(decode func(interface{}) error) error {
// Parse the input into type tomlServer, which defines the
// expected format of Server in TOML.
type tomlServer struct {
Addr string
Timeout string
}
var dec tomlServer
if err := decode(&dec); err != nil {
return err
}
// Validate the address.
if dec.Addr == "" {
return errors.New("missing server address")
}
_, _, err := net.SplitHostPort(dec.Addr)
if err != nil {
return fmt.Errorf("invalid server address %q: %v", dec.Addr, err)
}
// Validate the timeout and apply the default value.
var timeout time.Duration
if dec.Timeout == "" {
timeout = 10 * time.Second
} else if timeout, err = time.ParseDuration(dec.Timeout); err != nil {
return fmt.Errorf("invalid server timeout %q: %v", dec.Timeout, err)
}
// Assign the decoded value.
*s = Server{Addr: dec.Addr, Timeout: timeout}
return nil
}
func ExampleUnmarshalerRec() {
input := []byte(`
[[servers]]
addr = "198.51.100.3:80"
[[servers]]
addr = "192.0.2.10:8080"
timeout = "30s"
`)
var config struct {
Servers []Server
}
toml.Unmarshal(input, &config)
fmt.Printf("Unmarshaled:\n%+v\n\n", config)
// Output:
// Unmarshaled:
// {Servers:[{Addr:198.51.100.3:80 Timeout:10s} {Addr:192.0.2.10:8080 Timeout:30s}]}
}
|
