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awsvpc.go
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awsvpc.go
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// Copyright 2015 CoreOS, Inc.
//
// 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 awsvpc
import (
"encoding/json"
"fmt"
log "github.com/coreos/flannel/Godeps/_workspace/src/github.com/golang/glog"
"github.com/coreos/flannel/Godeps/_workspace/src/github.com/mitchellh/goamz/aws"
"github.com/coreos/flannel/Godeps/_workspace/src/github.com/mitchellh/goamz/ec2"
"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"
"net"
"sync"
)
type AwsVpcBackend struct {
sm subnet.Manager
network string
config *subnet.Config
cfg struct {
RouteTableID string
}
lease *subnet.Lease
ctx context.Context
cancel context.CancelFunc
wg sync.WaitGroup
}
func New(sm subnet.Manager, network string, config *subnet.Config) backend.Backend {
ctx, cancel := context.WithCancel(context.Background())
be := AwsVpcBackend{
sm: sm,
network: network,
config: config,
ctx: ctx,
cancel: cancel,
}
return &be
}
func (m *AwsVpcBackend) Init(extIface *net.Interface, extIP net.IP) (*backend.SubnetDef, error) {
// Parse our configuration
if len(m.config.Backend) > 0 {
if err := json.Unmarshal(m.config.Backend, &m.cfg); err != nil {
return nil, fmt.Errorf("error decoding VPC backend config: %v", err)
}
}
// Acquire the lease form subnet manager
attrs := subnet.LeaseAttrs{
PublicIP: ip.FromIP(extIP),
}
l, err := m.sm.AcquireLease(m.ctx, m.network, &attrs)
switch err {
case nil:
m.lease = l
case context.Canceled, context.DeadlineExceeded:
return nil, err
default:
return nil, fmt.Errorf("failed to acquire lease: %v", err)
}
// Figure out this machine's EC2 instance ID and region
identity, err := getInstanceIdentity()
if err != nil {
return nil, fmt.Errorf("error getting EC2 instance identity: %v", err)
}
instanceID, ok := identity["instanceId"].(string)
if !ok {
return nil, fmt.Errorf("invalid EC2 instance ID: %v", identity["instanceId"])
}
regionVal, _ := identity["region"].(string)
region, ok := aws.Regions[regionVal]
if !ok {
return nil, fmt.Errorf("invalid AWS region: %v", identity["region"])
}
// Setup the EC2 client
auth, err := aws.GetAuth("", "")
if err != nil {
return nil, fmt.Errorf("error getting AWS credentials from environment: %v", err)
}
ec2c := ec2.New(auth, region)
if m.cfg.RouteTableID == "" {
log.Infof("RouteTableID not passed as config parameter, attempting to detect")
routeTableID, err := m.DetectRouteTableID(instanceID, ec2c)
if err != nil {
return nil, err
}
log.Info("Detected routeRouteTableID: ", routeTableID)
m.cfg.RouteTableID = routeTableID
}
filter := ec2.NewFilter()
filter.Add("route.destination-cidr-block", l.Subnet.String())
filter.Add("route.state", "active")
resp, err := ec2c.DescribeRouteTables([]string{m.cfg.RouteTableID}, filter)
if err != nil {
log.Errorf("Error describing route tables: %v", err)
if ec2Err, ok := err.(*ec2.Error); ok {
if ec2Err.Code == "UnauthorizedOperation" {
log.Errorf("Note: describeRouteTables permission cannot be bound to any resource")
}
}
} else {
for _, routeTable := range resp.RouteTables {
for _, route := range routeTable.Routes {
if l.Subnet.String() == route.DestinationCidrBlock && route.State == "active" {
log.Errorf("Matching *active* entry to: %s that will be deleted: %s, %s \n", l.Subnet.String(), route.DestinationCidrBlock, route.GatewayId)
}
}
}
}
// Delete route for this machine's subnet if it already exists
if _, err := ec2c.DeleteRoute(m.cfg.RouteTableID, l.Subnet.String()); err != nil {
if ec2err, ok := err.(*ec2.Error); !ok || ec2err.Code != "InvalidRoute.NotFound" {
// an error other than the route not already existing occurred
return nil, fmt.Errorf("error deleting existing route for %s: %v", l.Subnet.String(), err)
}
}
// Add the route for this machine's subnet
route := &ec2.CreateRoute{
RouteTableId: m.cfg.RouteTableID,
InstanceId: instanceID,
DestinationCidrBlock: l.Subnet.String(),
}
if _, err := ec2c.CreateRoute(route); err != nil {
return nil, fmt.Errorf("unable to add route %+v: %v", route, err)
}
return &backend.SubnetDef{
Net: l.Subnet,
MTU: extIface.MTU,
}, nil
}
func (m *AwsVpcBackend) DetectRouteTableID(instanceID string, ec2c *ec2.EC2) (string, error) {
resp, err := ec2c.Instances([]string{instanceID}, nil)
if err != nil {
return "", fmt.Errorf("error getting instance info: %v", err)
}
subnetID := resp.Reservations[0].Instances[0].SubnetId
log.Info("SubnetId: ", subnetID)
filter := ec2.NewFilter()
filter.Add("association.subnet-id", subnetID)
res, err := ec2c.DescribeRouteTables(nil, filter)
if err != nil {
return "", fmt.Errorf("error describing routeTables for subnetID %s: %v", subnetID, err)
}
return res.RouteTables[0].RouteTableId, nil
}
func (m *AwsVpcBackend) Run() {
subnet.LeaseRenewer(m.ctx, m.sm, m.network, m.lease)
}
func (m *AwsVpcBackend) Stop() {
m.cancel()
}
func (m *AwsVpcBackend) Name() string {
return "aws-vpc"
}