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gce.go
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gce.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.
// This work borrows from the https://github.com/kelseyhightower/flannel-route-manager
// project which has the following license agreement.
// Copyright (c) 2014 Kelsey Hightower
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
// of the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package gce
import (
"fmt"
"net"
"strings"
"sync"
"time"
"github.com/coreos/flannel/Godeps/_workspace/src/code.google.com/p/goauth2/compute/serviceaccount"
"github.com/coreos/flannel/Godeps/_workspace/src/code.google.com/p/google-api-go-client/compute/v1"
"github.com/coreos/flannel/Godeps/_workspace/src/code.google.com/p/google-api-go-client/googleapi"
log "github.com/coreos/flannel/Godeps/_workspace/src/github.com/golang/glog"
"github.com/coreos/flannel/Godeps/_workspace/src/golang.org/x/net/context"
"github.com/coreos/flannel/backend"
"github.com/coreos/flannel/pkg/ip"
"github.com/coreos/flannel/subnet"
)
var metadataEndpoint = "http://169.254.169.254/computeMetadata/v1"
var replacer = strings.NewReplacer(".", "-", "/", "-")
type GCEBackend struct {
network string
project string
sm subnet.Manager
config *subnet.Config
lease *subnet.Lease
ctx context.Context
cancel context.CancelFunc
wg sync.WaitGroup
computeService *compute.Service
gceNetwork *compute.Network
gceInstance *compute.Instance
}
func New(sm subnet.Manager, network string, config *subnet.Config) backend.Backend {
ctx, cancel := context.WithCancel(context.Background())
gb := GCEBackend{
sm: sm,
config: config,
ctx: ctx,
cancel: cancel,
network: network,
}
return &gb
}
func (g *GCEBackend) Init(extIface *net.Interface, extIP net.IP) (*backend.SubnetDef, error) {
attrs := subnet.LeaseAttrs{
PublicIP: ip.FromIP(extIP),
}
l, err := g.sm.AcquireLease(g.ctx, g.network, &attrs)
switch err {
case nil:
g.lease = l
case context.Canceled, context.DeadlineExceeded:
return nil, err
default:
return nil, fmt.Errorf("failed to acquire lease: %v", err)
}
client, err := serviceaccount.NewClient(&serviceaccount.Options{})
if err != nil {
return nil, fmt.Errorf("error creating client: %v", err)
}
g.computeService, err = compute.New(client)
if err != nil {
return nil, fmt.Errorf("error creating compute service: %v", err)
}
networkName, err := networkFromMetadata()
if err != nil {
return nil, fmt.Errorf("error getting network metadata: %v", err)
}
g.project, err = projectFromMetadata()
if err != nil {
return nil, fmt.Errorf("error getting project: %v", err)
}
instanceName, err := instanceNameFromMetadata()
if err != nil {
return nil, fmt.Errorf("error getting instance name: %v", err)
}
instanceZone, err := instanceZoneFromMetadata()
if err != nil {
return nil, fmt.Errorf("error getting instance zone: %v", err)
}
g.gceNetwork, err = g.computeService.Networks.Get(g.project, networkName).Do()
if err != nil {
return nil, fmt.Errorf("error getting network from compute service: %v", err)
}
g.gceInstance, err = g.computeService.Instances.Get(g.project, instanceZone, instanceName).Do()
if err != nil {
return nil, fmt.Errorf("error getting instance from compute service: %v", err)
}
found, err := g.handleMatchingRoute(l.Subnet.String())
if err != nil {
return nil, fmt.Errorf("error handling matching route: %v", err)
}
if !found {
operation, err := g.insertRoute(l.Subnet.String())
if err != nil {
return nil, fmt.Errorf("error inserting route: %v", err)
}
err = g.pollOperationStatus(operation.Name)
if err != nil {
return nil, fmt.Errorf("insert operaiton failed: ", err)
}
}
return &backend.SubnetDef{
Net: l.Subnet,
MTU: extIface.MTU,
}, nil
}
func (g *GCEBackend) Run() {
log.Info("GCE backend running")
subnet.LeaseRenewer(g.ctx, g.sm, g.network, g.lease)
}
func (g *GCEBackend) Stop() {
log.Info("GCE backend stopping")
g.cancel()
}
func (g *GCEBackend) Name() string {
return "gce"
}
func (g *GCEBackend) pollOperationStatus(operationName string) error {
for i := 0; i < 100; i++ {
operation, err := g.computeService.GlobalOperations.Get(g.project, operationName).Do()
if err != nil {
return fmt.Errorf("error fetching operation status: %v", err)
}
if operation.Error != nil {
return fmt.Errorf("error running operation: %v", operation.Error)
}
if i%5 == 0 {
log.Infof("%v operation status: %v waiting for completion...", operation.OperationType, operation.Status)
}
if operation.Status == "DONE" {
return nil
}
time.Sleep(time.Second)
}
return fmt.Errorf("timeout waiting for operation to finish")
}
//returns true if an exact matching rule is found
func (g *GCEBackend) handleMatchingRoute(subnet string) (bool, error) {
matchingRoute, err := g.getRoute(subnet)
if err != nil {
if apiError, ok := err.(*googleapi.Error); ok {
if apiError.Code != 404 {
return false, fmt.Errorf("error getting the route err: %v", err)
}
return false, nil
}
return false, fmt.Errorf("error getting googleapi: %v", err)
}
if matchingRoute.NextHopInstance == g.gceInstance.SelfLink {
log.Info("Exact pre-existing route found")
return true, nil
}
log.Info("Deleting conflicting route")
operation, err := g.deleteRoute(subnet)
if err != nil {
return false, fmt.Errorf("error deleting conflicting route : %v", err)
}
err = g.pollOperationStatus(operation.Name)
if err != nil {
return false, fmt.Errorf("delete operation failed: %v", err)
}
return false, nil
}
func (g *GCEBackend) getRoute(subnet string) (*compute.Route, error) {
routeName := formatRouteName(subnet)
return g.computeService.Routes.Get(g.project, routeName).Do()
}
func (g *GCEBackend) deleteRoute(subnet string) (*compute.Operation, error) {
routeName := formatRouteName(subnet)
return g.computeService.Routes.Delete(g.project, routeName).Do()
}
func (g *GCEBackend) insertRoute(subnet string) (*compute.Operation, error) {
log.Infof("Inserting route for subnet: %v", subnet)
route := &compute.Route{
Name: formatRouteName(subnet),
DestRange: subnet,
Network: g.gceNetwork.SelfLink,
NextHopInstance: g.gceInstance.SelfLink,
Priority: 1000,
Tags: []string{},
}
return g.computeService.Routes.Insert(g.project, route).Do()
}
func formatRouteName(subnet string) string {
return fmt.Sprintf("flannel-%s", replacer.Replace(subnet))
}