/
etcd.go
256 lines (221 loc) · 5.43 KB
/
etcd.go
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package etcd
import (
"encoding/json"
"errors"
"net/http"
"path"
"path/filepath"
"strings"
"time"
log "github.com/Sirupsen/logrus"
etcd "github.com/coreos/etcd/client"
"golang.org/x/net/context"
)
const (
keyApp = "/apps" // single app
keyCompose = "/composes" // compose instance (group apps)
keyFrameworkID = "/framework" // framework id
keyTasks = "tasks" // sub key of keyApp
keyVersions = "versions" // sub key of keyApp
)
var (
errAppNotFound = errors.New("app not found")
errAppAlreadyExists = errors.New("app already exists")
errVersionAlreadyExists = errors.New("version already exists")
errInstanceNotFound = errors.New("instance not found")
errInvalidGet = errors.New("Get() on directory node make no sense")
errInvalidList = errors.New("can't List() on key Node")
)
type EtcdStore struct {
mapi etcd.MembersAPI
kapi etcd.KeysAPI
prefix string
}
func NewEtcdStore(addrs []string) (*EtcdStore, error) {
cfg := etcd.Config{
Endpoints: addrs,
Transport: etcd.DefaultTransport,
HeaderTimeoutPerRequest: time.Second * 3,
}
etcdc, err := etcd.New(cfg)
if err != nil {
return nil, err
}
store := &EtcdStore{
mapi: etcd.NewMembersAPI(etcdc),
kapi: etcd.NewKeysAPI(etcdc),
prefix: "/swan",
}
// create base keys nodes
for _, node := range []string{keyApp, keyCompose} {
store.ensureDir(node)
}
return store, nil
}
func (s *EtcdStore) clean(p string) string {
if !strings.HasPrefix(p, s.prefix) {
p = s.prefix + "/" + p
}
return path.Clean(p)
}
func (s *EtcdStore) get(key string) ([]byte, error) {
key = s.clean(key)
opts := &etcd.GetOptions{
Recursive: false,
Quorum: true,
}
res, err := s.kapi.Get(context.Background(), key, opts)
if err != nil {
return nil, err
}
if res.Node.Dir {
return nil, errInvalidGet
}
return []byte(res.Node.Value), nil
}
func (s *EtcdStore) list(key string) (map[string][]byte, error) {
key = s.clean(key)
opts := &etcd.GetOptions{
Recursive: true,
Quorum: true,
Sort: true,
}
res := map[string][]byte{}
resp, err := s.kapi.Get(context.Background(), key, opts)
if err != nil {
return res, err
}
if !resp.Node.Dir {
return res, errInvalidList
}
for _, n := range resp.Node.Nodes {
res[filepath.Base(n.Key)] = []byte(n.Value)
}
return res, nil
}
func (s *EtcdStore) ensureDir(key string) error {
key = s.clean(key)
if ok, _ := s.exists(key); ok {
return nil
}
opts := &etcd.SetOptions{
Dir: true,
}
_, err := s.kapi.Set(context.Background(), key, "", opts)
if err != nil {
log.Warnf("ensure etcd dir [%s] error: %v", key, err)
return err
}
return nil
}
func (s *EtcdStore) create(key string, value []byte) error {
return s.set(key, value, etcd.PrevNoExist)
}
func (s *EtcdStore) update(key string, value []byte) error {
return s.set(key, value, etcd.PrevExist)
}
func (s *EtcdStore) upsert(key string, value []byte) error {
return s.set(key, value, etcd.PrevIgnore)
}
func (s *EtcdStore) set(key string, value []byte, mode etcd.PrevExistType) error {
key = s.clean(key)
opts := &etcd.SetOptions{
PrevExist: mode,
Dir: false,
TTL: time.Duration(0),
}
_, err := s.kapi.Set(context.Background(), key, string(value), opts)
return err
}
func (s *EtcdStore) del(key string, recursive bool) error {
key = s.clean(key)
opts := &etcd.DeleteOptions{
Dir: false,
Recursive: recursive,
}
_, err := s.kapi.Delete(context.Background(), key, opts)
return err
}
func (s *EtcdStore) delDir(key string, recursive bool) error {
key = s.clean(key)
opts := &etcd.DeleteOptions{
Dir: true,
Recursive: recursive,
}
_, err := s.kapi.Delete(context.Background(), key, opts)
return err
}
func (s *EtcdStore) exists(key string) (bool, error) {
_, err := s.get(key)
if err != nil {
if isEtcdKeyNotFound(err) {
return false, nil
}
return false, err
}
return true, nil
}
func isEtcdKeyNotFound(err error) bool {
if cErr, ok := err.(etcd.Error); ok {
return cErr.Code == etcd.ErrorCodeKeyNotFound
}
return false
}
type EtcdClusterInfo struct {
Health bool `json:"health"`
Members []MemberWrapper `json:"members"`
}
type MemberWrapper struct {
etcd.Member
Leader bool `json:"leader"`
Health bool `json:"health"`
EndPoint string `json:"endpoint"`
}
func (s *EtcdStore) IsErrNotFound(err error) bool {
return isEtcdKeyNotFound(err)
}
func (s *EtcdStore) ClusterInfo() (EtcdClusterInfo, error) {
var eci = EtcdClusterInfo{}
members, err := s.mapi.List(context.Background())
if err != nil {
return eci, err
}
leader, err := s.mapi.Leader(context.Background())
if err != nil {
return eci, err
}
h := func(u string) bool {
u = strings.TrimSuffix(u, "/") + "/health"
resp, err := http.Get(u)
if err != nil {
return false
}
var health struct {
Health string `json:"health"`
}
json.NewDecoder(resp.Body).Decode(&health)
return health.Health == "true"
}
var mws []MemberWrapper
for _, member := range members {
mw := MemberWrapper{
Member: member,
Leader: member.ID == leader.ID,
Health: h(member.ClientURLs[0]),
EndPoint: member.ClientURLs[0],
}
if mw.Health {
eci.Health = true
}
mws = append(mws, mw)
}
eci.Members = mws
return eci, nil
}
// encode & decode is just short-hands for json Marshal/Unmarshal
func encode(data interface{}) ([]byte, error) {
return json.Marshal(data)
}
func decode(bs []byte, v interface{}) error {
return json.Unmarshal(bs, v)
}