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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"
"strings"
"sync"
log "github.com/golang/glog"
"golang.org/x/net/context"
"google.golang.org/api/googleapi"
"github.com/coreos/flannel/backend"
"github.com/coreos/flannel/pkg/ip"
"github.com/coreos/flannel/subnet"
)
func init() {
backend.Register("gce", New)
}
var metadataEndpoint = "http://169.254.169.254/computeMetadata/v1"
var replacer = strings.NewReplacer(".", "-", "/", "-")
type GCEBackend struct {
sm subnet.Manager
extIface *backend.ExternalInterface
apiInit sync.Once
api *gceAPI
}
func New(sm subnet.Manager, extIface *backend.ExternalInterface) (backend.Backend, error) {
gb := GCEBackend{
sm: sm,
extIface: extIface,
}
return &gb, nil
}
func (g *GCEBackend) ensureAPI() error {
var err error
g.apiInit.Do(func() {
g.api, err = newAPI()
})
return err
}
func (g *GCEBackend) Run(ctx context.Context) {
<-ctx.Done()
}
func (g *GCEBackend) RegisterNetwork(ctx context.Context, network string, config *subnet.Config) (backend.Network, error) {
attrs := subnet.LeaseAttrs{
PublicIP: ip.FromIP(g.extIface.ExtAddr),
}
l, err := g.sm.AcquireLease(ctx, network, &attrs)
switch err {
case nil:
case context.Canceled, context.DeadlineExceeded:
return nil, err
default:
return nil, fmt.Errorf("failed to acquire lease: %v", err)
}
if err = g.ensureAPI(); err != nil {
return nil, 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.api.insertRoute(l.Subnet.String())
if err != nil {
return nil, fmt.Errorf("error inserting route: %v", err)
}
err = g.api.pollOperationStatus(operation.Name)
if err != nil {
return nil, fmt.Errorf("insert operaiton failed: ", err)
}
}
return &backend.SimpleNetwork{
SubnetLease: l,
ExtIface: g.extIface,
}, nil
}
//returns true if an exact matching rule is found
func (g *GCEBackend) handleMatchingRoute(subnet string) (bool, error) {
matchingRoute, err := g.api.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.api.gceInstance.SelfLink {
log.Info("Exact pre-existing route found")
return true, nil
}
log.Info("Deleting conflicting route")
operation, err := g.api.deleteRoute(subnet)
if err != nil {
return false, fmt.Errorf("error deleting conflicting route : %v", err)
}
err = g.api.pollOperationStatus(operation.Name)
if err != nil {
return false, fmt.Errorf("delete operation failed: %v", err)
}
return false, nil
}