preparing for v0.5

src/proxy/fields/port.go

@@ -0,0 +1,40 @@
+package fields
+
+import (
+	"strconv"
+
+	E "github.com/yusing/go-proxy/error"
+)
+
+type Port int
+
+func NewPort(v string) (Port, E.NestedError) {
+	p, err := strconv.Atoi(v)
+	if err != nil {
+		return ErrPort, E.From(err)
+	}
+	return NewPortInt(p)
+}
+
+func NewPortInt(v int) (Port, E.NestedError) {
+	pp := Port(v)
+	if err := pp.boundCheck(); err.IsNotNil() {
+		return ErrPort, err
+	}
+	return pp, E.Nil()
+}
+
+func (p Port) boundCheck() E.NestedError {
+	if p < MinPort || p > MaxPort {
+		return E.Invalid("port", p)
+	}
+	return E.Nil()
+}
+
+const (
+	MinPort  = 0
+	MaxPort  = 65535
+	ErrPort  = Port(-1)
+	NoPort   = Port(-1)
+	ZeroPort = Port(0)
+)