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translate.go
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translate.go
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package hardware
import (
"fmt"
"io"
)
// MachineReader reads single Machine configuration at a time. When there are no more Machine entries
// to be read, Read() returns io.EOF.
type MachineReader interface {
Read() (Machine, error)
}
// MachineWriter writes Machine entries.
type MachineWriter interface {
Write(Machine) error
}
// MachineValidator validates an instance of Machine.
type MachineValidator interface {
Validate(Machine) error
}
// TranslateAll reads entries 1 at a time from reader and writes them to writer. When reader returns io.EOF,
// TranslateAll returns nil. Failure to return io.EOF from reader will result in an infinite loop.
func TranslateAll(reader MachineReader, writer MachineWriter, validator MachineValidator) error {
for {
err := Translate(reader, writer, validator)
if err == io.EOF {
return nil
}
if err != nil {
return err
}
}
}
// Translate reads 1 entry from reader and writes it to writer. When reader returns io.EOF Translate
// returns io.EOF to the caller.
func Translate(reader MachineReader, writer MachineWriter, validator MachineValidator) error {
machine, err := reader.Read()
if err == io.EOF {
return err
}
if err != nil {
return fmt.Errorf("read: invalid hardware: %v", err)
}
if err := validator.Validate(machine); err != nil {
return err
}
if err := writer.Write(machine); err != nil {
return fmt.Errorf("write: %v", err)
}
return nil
}