source: code/trunk/vendor/github.com/pires/go-proxyproto/version_cmd.go@ 824

package proxyproto

// ProtocolVersionAndCommand represents the command in proxy protocol v2.
// Command doesn't exist in v1 but it should be set since other parts of
// this library may rely on it for determining connection details.
type ProtocolVersionAndCommand byte

const (
        // LOCAL represents the LOCAL command in v2 or UNKNOWN transport in v1,
        // in which case no address information is expected.
        LOCAL ProtocolVersionAndCommand = '\x20'
        // PROXY represents the PROXY command in v2 or transport is not UNKNOWN in v1,
        // in which case valid local/remote address and port information is expected.
        PROXY ProtocolVersionAndCommand = '\x21'
)

var supportedCommand = map[ProtocolVersionAndCommand]bool{
        LOCAL: true,
        PROXY: true,
}

// IsLocal returns true if the command in v2 is LOCAL or the transport in v1 is UNKNOWN,
// i.e. when no address information is expected, false otherwise.
func (pvc ProtocolVersionAndCommand) IsLocal() bool {
        return LOCAL == pvc
}

// IsProxy returns true if the command in v2 is PROXY or the transport in v1 is not UNKNOWN,
// i.e. when valid local/remote address and port information is expected, false otherwise.
func (pvc ProtocolVersionAndCommand) IsProxy() bool {
        return PROXY == pvc
}

// IsUnspec returns true if the command is unspecified, false otherwise.
func (pvc ProtocolVersionAndCommand) IsUnspec() bool {
        return !(pvc.IsLocal() || pvc.IsProxy())
}

func (pvc ProtocolVersionAndCommand) toByte() byte {
        if pvc.IsLocal() {
                return byte(LOCAL)
        } else if pvc.IsProxy() {
                return byte(PROXY)
        }

        return byte(LOCAL)
}