mirror of
https://github.com/k3s-io/k3s.git
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e8381db778
* Update Kubernetes to v1.21.0 * Update to golang v1.16.2 * Update dependent modules to track with upstream * Switch to upstream flannel * Track changes to upstream cloud-controller-manager and FeatureGates Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
130 lines
3.0 KiB
Go
130 lines
3.0 KiB
Go
// Copyright 2015 flannel authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package subnet
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import (
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"encoding/json"
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"errors"
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"fmt"
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"net"
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"regexp"
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"strconv"
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"time"
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"github.com/flannel-io/flannel/pkg/ip"
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"golang.org/x/net/context"
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)
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var (
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ErrLeaseTaken = errors.New("subnet: lease already taken")
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ErrNoMoreTries = errors.New("subnet: no more tries")
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subnetRegex = regexp.MustCompile(`(\d+\.\d+.\d+.\d+)-(\d+)`)
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)
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type LeaseAttrs struct {
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PublicIP ip.IP4
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BackendType string `json:",omitempty"`
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BackendData json.RawMessage `json:",omitempty"`
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}
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type Lease struct {
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Subnet ip.IP4Net
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Attrs LeaseAttrs
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Expiration time.Time
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Asof uint64
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}
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func (l *Lease) Key() string {
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return MakeSubnetKey(l.Subnet)
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}
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type (
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EventType int
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Event struct {
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Type EventType `json:"type"`
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Lease Lease `json:"lease,omitempty"`
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}
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)
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const (
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EventAdded EventType = iota
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EventRemoved
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)
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type LeaseWatchResult struct {
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// Either Events or Snapshot will be set. If Events is empty, it means
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// the cursor was out of range and Snapshot contains the current list
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// of items, even if empty.
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Events []Event `json:"events"`
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Snapshot []Lease `json:"snapshot"`
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Cursor interface{} `json:"cursor"`
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}
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func (et EventType) MarshalJSON() ([]byte, error) {
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s := ""
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switch et {
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case EventAdded:
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s = "added"
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case EventRemoved:
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s = "removed"
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default:
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return nil, errors.New("bad event type")
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}
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return json.Marshal(s)
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}
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func (et *EventType) UnmarshalJSON(data []byte) error {
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switch string(data) {
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case "\"added\"":
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*et = EventAdded
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case "\"removed\"":
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*et = EventRemoved
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default:
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fmt.Println(string(data))
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return errors.New("bad event type")
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}
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return nil
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}
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func ParseSubnetKey(s string) *ip.IP4Net {
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if parts := subnetRegex.FindStringSubmatch(s); len(parts) == 3 {
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snIp := net.ParseIP(parts[1]).To4()
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prefixLen, err := strconv.ParseUint(parts[2], 10, 5)
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if snIp != nil && err == nil {
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return &ip.IP4Net{IP: ip.FromIP(snIp), PrefixLen: uint(prefixLen)}
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}
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}
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return nil
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}
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func MakeSubnetKey(sn ip.IP4Net) string {
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return sn.StringSep(".", "-")
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}
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type Manager interface {
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GetNetworkConfig(ctx context.Context) (*Config, error)
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AcquireLease(ctx context.Context, attrs *LeaseAttrs) (*Lease, error)
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RenewLease(ctx context.Context, lease *Lease) error
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WatchLease(ctx context.Context, sn ip.IP4Net, cursor interface{}) (LeaseWatchResult, error)
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WatchLeases(ctx context.Context, cursor interface{}) (LeaseWatchResult, error)
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Name() string
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}
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