forked from aws/amazon-ecs-agent
/
transport.go
91 lines (81 loc) · 2.42 KB
/
transport.go
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// Copyright 2014-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may
// not use this file except in compliance with the License. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file is distributed
// on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
// express or implied. See the License for the specific language governing
// permissions and limitations under the License.
package api
import (
"errors"
"strings"
"github.com/cihub/seelog"
)
const (
// TransportProtocolTCP represents TCP
TransportProtocolTCP TransportProtocol = iota
// TransportProtocolUDP represents UDP
TransportProtocolUDP
tcp = "tcp"
udp = "udp"
)
// TransportProtocol is an enumeration of valid transport protocols
type TransportProtocol int32
// NewTransportProtocol returns a TransportProtocol from a string in the task
func NewTransportProtocol(protocol string) (TransportProtocol, error) {
switch protocol {
case tcp:
return TransportProtocolTCP, nil
case udp:
return TransportProtocolUDP, nil
default:
return TransportProtocolTCP, errors.New(protocol + " is not a recognized transport protocol")
}
}
// String converts TransportProtocol to a string
func (tp *TransportProtocol) String() string {
if tp == nil {
return tcp
}
switch *tp {
case TransportProtocolUDP:
return udp
case TransportProtocolTCP:
return tcp
default:
seelog.Critical("Unknown TransportProtocol type!")
return tcp
}
}
// UnmarshalJSON for TransportProtocol determines whether to use TCP or UDP,
// setting TCP as the zero-value but treating other unrecognized values as
// errors
func (tp *TransportProtocol) UnmarshalJSON(b []byte) error {
if strings.ToLower(string(b)) == "null" {
*tp = TransportProtocolTCP
seelog.Warn("Unmarshalled nil TransportProtocol as TCP")
return nil
}
switch string(b) {
case `"tcp"`:
*tp = TransportProtocolTCP
case `"udp"`:
*tp = TransportProtocolUDP
default:
*tp = TransportProtocolTCP
return errors.New("TransportProtocol must be \"tcp\" or \"udp\"; Got " + string(b))
}
return nil
}
// MarshalJSON overrides the logic for JSON-encoding the TransportProtocol type
func (tp *TransportProtocol) MarshalJSON() ([]byte, error) {
if tp == nil {
return []byte("null"), nil
}
return []byte(`"` + tp.String() + `"`), nil
}