/
consul.go
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/
consul.go
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// Copyright (c) 2016 Pulcy.
//
// 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 consul
import (
"fmt"
"os"
"strings"
"github.com/juju/errgo"
"github.com/pulcy/gluon/service"
"github.com/pulcy/gluon/templates"
)
var (
consulServiceName = "consul.service"
consulServiceTmpl = "templates/consul/" + consulServiceName + ".tmpl"
consulServicePath = "/etc/systemd/system/" + consulServiceName
serviceFileMode = os.FileMode(0644)
maskAny = errgo.MaskFunc(errgo.Any)
)
func NewService() service.Service {
return &consulService{}
}
type consulService struct{}
func (t *consulService) Name() string {
return "consul"
}
func (t *consulService) Setup(deps service.ServiceDependencies, flags *service.ServiceFlags) error {
changed, err := createService(deps, flags)
if err != nil {
return maskAny(err)
}
if flags.Force || changed {
if err := deps.Systemd.Enable(consulServiceName); err != nil {
return maskAny(err)
}
if err := deps.Systemd.Reload(); err != nil {
return maskAny(err)
}
if err := deps.Systemd.Restart(consulServiceName); err != nil {
return maskAny(err)
}
}
return nil
}
func createService(deps service.ServiceDependencies, flags *service.ServiceFlags) (bool, error) {
deps.Logger.Info("creating %s", consulServicePath)
members, err := flags.GetClusterMembers(deps.Logger)
if err != nil {
return false, maskAny(err)
}
var join []string
bootstrapExpect := 0
for _, m := range members {
if !m.EtcdProxy {
bootstrapExpect++
if m.ClusterIP != flags.Network.ClusterIP {
join = append(join, fmt.Sprintf("-retry-join %s", m.ClusterIP))
}
}
}
srv, err := isServer(members, flags)
if err != nil {
return false, maskAny(err)
}
args := fmt.Sprintf("-advertise=%s %s -client=0.0.0.0 -data-dir=/opt/consul/data", flags.Network.ClusterIP, strings.Join(join, " "))
if srv {
args = fmt.Sprintf("-server -bootstrap-expect=%d %s", bootstrapExpect, args)
}
opts := struct {
Flags string
}{
Flags: args,
}
changed, err := templates.Render(deps.Logger, consulServiceTmpl, consulServicePath, opts, serviceFileMode)
return changed, maskAny(err)
}
func isServer(members []service.ClusterMember, flags *service.ServiceFlags) (bool, error) {
for _, member := range members {
if member.ClusterIP == flags.Network.ClusterIP {
return !member.EtcdProxy, nil
}
}
return false, nil
}