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subnet.go
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subnet.go
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// Copyright 2015 flannel authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License 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 subnet
import (
"encoding/json"
"errors"
"fmt"
"net"
"regexp"
"strconv"
"time"
"github.com/coreos/flannel/pkg/ip"
"golang.org/x/net/context"
)
var (
ErrLeaseTaken = errors.New("subnet: lease already taken")
ErrNoMoreTries = errors.New("subnet: no more tries")
subnetRegex = regexp.MustCompile(`(\d+\.\d+.\d+.\d+)-(\d+)`)
)
type LeaseAttrs struct {
PublicIP ip.IP4
BackendType string `json:",omitempty"`
BackendData json.RawMessage `json:",omitempty"`
}
type Lease struct {
Subnet ip.IP4Net
Attrs LeaseAttrs
Expiration time.Time
Asof uint64
}
func (l *Lease) Key() string {
return MakeSubnetKey(l.Subnet)
}
type (
EventType int
Event struct {
Type EventType `json:"type"`
Lease Lease `json:"lease,omitempty"`
}
)
const (
EventAdded EventType = iota
EventRemoved
)
type LeaseWatchResult struct {
// Either Events or Snapshot will be set. If Events is empty, it means
// the cursor was out of range and Snapshot contains the current list
// of items, even if empty.
Events []Event `json:"events"`
Snapshot []Lease `json:"snapshot"`
Cursor interface{} `json:"cursor"`
}
func (et EventType) MarshalJSON() ([]byte, error) {
s := ""
switch et {
case EventAdded:
s = "added"
case EventRemoved:
s = "removed"
default:
return nil, errors.New("bad event type")
}
return json.Marshal(s)
}
func (et *EventType) UnmarshalJSON(data []byte) error {
switch string(data) {
case "\"added\"":
*et = EventAdded
case "\"removed\"":
*et = EventRemoved
default:
fmt.Println(string(data))
return errors.New("bad event type")
}
return nil
}
func ParseSubnetKey(s string) *ip.IP4Net {
if parts := subnetRegex.FindStringSubmatch(s); len(parts) == 3 {
snIp := net.ParseIP(parts[1]).To4()
prefixLen, err := strconv.ParseUint(parts[2], 10, 5)
if snIp != nil && err == nil {
return &ip.IP4Net{IP: ip.FromIP(snIp), PrefixLen: uint(prefixLen)}
}
}
return nil
}
func MakeSubnetKey(sn ip.IP4Net) string {
return sn.StringSep(".", "-")
}
type Manager interface {
GetNetworkConfig(ctx context.Context) (*Config, error)
AcquireLease(ctx context.Context, attrs *LeaseAttrs) (*Lease, error)
RenewLease(ctx context.Context, lease *Lease) error
WatchLease(ctx context.Context, sn ip.IP4Net, cursor interface{}) (LeaseWatchResult, error)
WatchLeases(ctx context.Context, cursor interface{}) (LeaseWatchResult, error)
Name() string
}