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pair.go
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pair.go
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package manager
import (
"crypto/rand"
"encoding/json"
"fmt"
"strconv"
"time"
"github.com/libopenstorage/openstorage/api"
clusterclient "github.com/libopenstorage/openstorage/api/client/cluster"
"github.com/libopenstorage/openstorage/cluster"
"github.com/libopenstorage/openstorage/pkg/auth"
"github.com/pkg/errors"
"github.com/portworx/kvdb"
"github.com/sirupsen/logrus"
)
const (
// ClusterPairKey is the key at which info about cluster pairs is stored in kvdb
ClusterPairKey = "cluster/pair"
// ClusterPairDefaultKey is the key at which the id for the default pair is stored
clusterPairDefaultKey = "cluster/pair/default"
)
// CreatePair remote pairs this cluster with a remote cluster.
func (c *ClusterManager) CreatePair(
request *api.ClusterPairCreateRequest,
) (*api.ClusterPairCreateResponse, error) {
remoteIp := request.RemoteClusterIp
for e := c.listeners.Front(); e != nil; e = e.Next() {
pairMode := e.Value.(cluster.ClusterListener).GetPairMode()
if pairMode == api.ClusterPairMode_DisasterRecovery &&
request.Mode == api.ClusterPairMode_Default {
// If DisasterRecovery mode is set on the listener
// then override the default mode
request.Mode = pairMode
}
}
// Pair with remote server
logrus.Infof("Attempting to pair with cluster at IP %v", remoteIp)
processRequest := &api.ClusterPairProcessRequest{
SourceClusterId: c.Uuid(),
RemoteClusterToken: request.RemoteClusterToken,
Mode: request.Mode,
CredentialId: request.CredentialId,
}
endpoint := remoteIp + ":" + strconv.FormatUint(uint64(request.RemoteClusterPort), 10)
clnt, err := clusterclient.NewInsecureTLSAuthClusterClient(endpoint, cluster.APIVersion, request.RemoteClusterToken, "")
if err != nil {
return nil, err
}
remoteCluster := clusterclient.ClusterManager(clnt)
// Issue a remote pair request
resp, err := remoteCluster.ProcessPairRequest(processRequest)
if err != nil {
logrus.Warnf("Unable to pair with %v: %v", remoteIp, err)
return nil, fmt.Errorf("Error from remote cluster: %v", err)
}
// Alert all listeners that we are pairing with a cluster.
for e := c.listeners.Front(); e != nil; e = e.Next() {
err = e.Value.(cluster.ClusterListener).CreatePair(
request,
resp,
)
if err != nil {
logrus.Errorf("Unable to notify %v on a cluster pair event: %v",
e.Value.(cluster.ClusterListener).String(),
err,
)
return nil, err
}
}
pairInfo := &api.ClusterPairInfo{
Id: resp.RemoteClusterId,
Name: resp.RemoteClusterName,
Endpoint: clnt.BaseURL(),
CurrentEndpoints: resp.RemoteClusterEndpoints,
Token: request.RemoteClusterToken,
Options: resp.Options,
Mode: request.Mode,
}
err = pairCreate(pairInfo, request.SetDefault)
if err != nil {
return nil, err
}
logrus.Infof("Successfully paired with cluster ID %v", resp.RemoteClusterId)
response := &api.ClusterPairCreateResponse{
RemoteClusterId: pairInfo.Id,
RemoteClusterName: pairInfo.Name,
}
return response, nil
}
// ProcessPairRequest handles a remote cluster's pair request
func (c *ClusterManager) ProcessPairRequest(
request *api.ClusterPairProcessRequest,
) (*api.ClusterPairProcessResponse, error) {
if request.SourceClusterId == c.Uuid() {
return nil, fmt.Errorf("Cannot create cluster pair with self")
}
response := &api.ClusterPairProcessResponse{
RemoteClusterId: c.Uuid(),
RemoteClusterName: c.config.ClusterId,
}
// Get the token without resetting it
tokenResp, err := c.GetPairToken(false)
if err != nil {
return nil, fmt.Errorf("Error getting Cluster Token: %v", err)
}
if tokenResp.Token != request.RemoteClusterToken {
return nil, fmt.Errorf("Token mismatch during pairing")
}
// Alert all listeners that we have received a pair request
for e := c.listeners.Front(); e != nil; e = e.Next() {
err := e.Value.(cluster.ClusterListener).ProcessPairRequest(
request,
response,
)
if err != nil {
logrus.Errorf("Unable to notify %v on a a cluster remote pair request: %v",
e.Value.(cluster.ClusterListener).String(),
err,
)
return nil, err
}
}
logrus.Infof("Successfully paired with remote cluster %v", request.SourceClusterId)
return response, nil
}
func (c *ClusterManager) RefreshPair(
id string,
) error {
pair, err := pairGet(id)
if err != nil {
return err
}
processRequest := &api.ClusterPairProcessRequest{
SourceClusterId: c.Uuid(),
RemoteClusterToken: pair.Token,
CredentialId: pair.Options[api.OptRemoteCredUUID],
}
endpoints := pair.CurrentEndpoints
endpoints = append(endpoints, pair.Endpoint)
for _, endpoint := range endpoints {
clnt, err := clusterclient.NewInsecureTLSAuthClusterClient(endpoint, cluster.APIVersion, pair.Token, "")
if err != nil {
logrus.Warnf("Unable to create cluster client for %v: %v", endpoint, err)
continue
}
remoteCluster := clusterclient.ClusterManager(clnt)
// Issue a remote pair request to get updated info about the cluster
resp, err := remoteCluster.ProcessPairRequest(processRequest)
if err != nil {
logrus.Warnf("Unable to get pair info from %v: %v", endpoint, err)
continue
}
pairInfo := &api.ClusterPairInfo{
Id: resp.RemoteClusterId,
Name: resp.RemoteClusterName,
Endpoint: pair.Endpoint,
CurrentEndpoints: resp.RemoteClusterEndpoints,
Token: pair.Token,
}
// Use original options and override with updates ones. This
// prevents any options we created locally from getting overriden
pairInfo.Options = pair.Options
for k, v := range resp.Options {
pairInfo.Options[k] = v
}
return pairUpdate(pairInfo)
}
return fmt.Errorf("error updating pair info for %v, all endpoints are unreachable", id)
}
func (c *ClusterManager) DeletePair(
id string,
) error {
if err := pairDelete(id); err != nil {
return err
}
// Right now the listeners aren't notified of the delete.
// Need to add that so that they can stop any operations with that cluster
logrus.Infof("Successfully deleted pairing with cluster %v", id)
return nil
}
func (c *ClusterManager) GetPair(
id string,
) (*api.ClusterPairGetResponse, error) {
var err error
if id == "" {
id, err = getDefaultPairId()
if err != nil {
if err == kvdb.ErrNotFound {
return nil, fmt.Errorf("No default cluster pair found.")
} else {
return nil, err
}
}
}
pair, err := pairGet(id)
if err != nil {
if err == kvdb.ErrNotFound {
return nil, fmt.Errorf("Cluster pair for id %v not found", id)
} else {
return nil, err
}
}
return &api.ClusterPairGetResponse{
PairInfo: pair,
}, nil
}
func (c *ClusterManager) EnumeratePairs() (*api.ClusterPairsEnumerateResponse, error) {
response := &api.ClusterPairsEnumerateResponse{}
pairs, err := pairList()
if err != nil {
return nil, err
}
response.Pairs = pairs
response.DefaultId, err = getDefaultPairId()
if err != nil {
logrus.Debugf("Error getting default cluster pair: %v", err)
}
return response, nil
}
func (c *ClusterManager) ValidatePair(
id string,
) error {
pairResp, err := c.GetPair(id)
if err != nil {
return err
} else if pairResp.PairInfo == nil {
return fmt.Errorf("Cluster pair for id %v not found", id)
}
var lastErr error
endpoints := pairResp.PairInfo.CurrentEndpoints
endpoints = append(endpoints, pairResp.PairInfo.Endpoint)
for _, endpoint := range endpoints {
clnt, err := clusterclient.NewInsecureTLSAuthClusterClient(
endpoint,
cluster.APIVersion,
pairResp.PairInfo.Token,
"",
)
if err != nil {
msg := fmt.Sprintf("Unable to create cluster client for %v: %v", endpoint, err)
logrus.Warn(msg)
lastErr = fmt.Errorf(msg)
continue
}
resp, err := clusterclient.ClusterManager(clnt).Enumerate()
if err != nil {
msg := fmt.Sprintf("Unable to get cluster status from %v: %v", endpoint, err)
logrus.Warn(msg)
lastErr = fmt.Errorf(msg)
continue
}
if resp.Status == api.Status_STATUS_OK {
lastErr = nil
break
}
msg := fmt.Sprintf("Invalid remote cluster status: %v", resp.Status)
logrus.Warn(msg)
lastErr = fmt.Errorf(msg)
}
if lastErr != nil {
return lastErr
}
for e := c.listeners.Front(); e != nil; e = e.Next() {
err := e.Value.(cluster.ClusterListener).ValidatePair(
pairResp.PairInfo,
)
if err != nil {
logrus.Errorf("Unable to validate %v on a cluster validate event: %v",
e.Value.(cluster.ClusterListener).String(),
err,
)
return fmt.Errorf("Failed to validate cluster pair. %v", err)
}
}
logrus.Infof("Successfully validated pairing with cluster ID: %v",
pairResp.PairInfo.Id)
return nil
}
func (c *ClusterManager) GetPairToken(
reset bool,
) (*api.ClusterPairTokenGetResponse, error) {
var (
pairToken string
returnError error
)
updateCallbackFn := func(db *cluster.ClusterInfo) (bool, error) {
pairToken = db.PairToken
// Generate a token if we don't have one or a reset has been requested
if pairToken == "" || reset {
token, err := c.generatePairToken()
if err != nil {
returnError = errors.Wrap(err, "Failed to generate token")
return false, nil
}
pairToken = fmt.Sprintf("%s", token)
db.PairToken = pairToken
return true, nil
}
return false, nil
}
returnError = updateDB("GetPairToken", c.selfNode.Id, updateCallbackFn)
return &api.ClusterPairTokenGetResponse{
Token: pairToken,
}, returnError
}
func (c *ClusterManager) generatePairToken() (string, error) {
var token string
var err error
if auth.Enabled() {
token, err = c.systemTokenManager.GetToken(
&auth.Options{
Expiration: time.Now().Add(5 * auth.Year).Unix(),
},
)
if err != nil {
return "", err
}
} else {
randToken := make([]byte, 64)
rand.Read(randToken)
token = fmt.Sprintf("%x", randToken)
}
return token, nil
}
func pairList() (map[string]*api.ClusterPairInfo, error) {
kvdb := kvdb.Instance()
pairs := make(map[string]*api.ClusterPairInfo)
kv, err := kvdb.Enumerate(ClusterPairKey)
if err != nil {
return nil, err
}
for _, v := range kv {
if v.Key == clusterPairDefaultKey {
continue
}
info := &api.ClusterPairInfo{}
err = json.Unmarshal(v.Value, &info)
if err != nil {
return nil, err
}
pairs[info.Id] = info
}
return pairs, nil
}
func pairCreate(info *api.ClusterPairInfo, setDefault bool) error {
kv := kvdb.Instance()
kvp, err := kv.Lock(ClusterPairKey)
if err != nil {
return err
}
defer kv.Unlock(kvp)
key := ClusterPairKey + "/" + info.Id
_, err = kv.Create(key, info, 0)
if err != nil {
if err == kvdb.ErrExist {
kvp, err = kv.Get(key)
if err != nil {
return err
}
storedInfo := &api.ClusterPairInfo{}
err = json.Unmarshal(kvp.Value, &storedInfo)
if err != nil {
return err
}
if info.Token != storedInfo.Token {
return fmt.Errorf("Invalid token for already paired cluster %v", info.Id)
}
} else {
return err
}
}
defaultId, err := getDefaultPairId()
// Set this pair as the default if no default is set or it has
// explicilty been asked
if setDefault || err == kvdb.ErrNotFound || defaultId == "" {
err = setDefaultPairId(info.Id)
if err != nil {
return err
}
}
return nil
}
// Return the default pair id if set, error if none set
func getDefaultPairId() (string, error) {
kv := kvdb.Instance()
kvp, err := kv.Get(clusterPairDefaultKey)
if err != nil {
return "", err
}
return string(kvp.Value), nil
}
func setDefaultPairId(id string) error {
kv := kvdb.Instance()
_, err := kv.Put(clusterPairDefaultKey, id, 0)
if err != nil {
return err
}
return nil
}
func deleteDefaultPairId() error {
kv := kvdb.Instance()
_, err := kv.Delete(clusterPairDefaultKey)
if err != nil {
return err
}
return nil
}
func pairUpdate(info *api.ClusterPairInfo) error {
kvdb := kvdb.Instance()
kvp, err := kvdb.Lock(ClusterPairKey)
if err != nil {
return err
}
defer kvdb.Unlock(kvp)
key := ClusterPairKey + "/" + info.Id
_, err = kvdb.Update(key, info, 0)
if err != nil {
return err
}
return nil
}
func pairDelete(id string) error {
kv := kvdb.Instance()
kvp, err := kv.Lock(ClusterPairKey)
if err != nil {
return err
}
defer kv.Unlock(kvp)
defaultId, err := getDefaultPairId()
if err != kvdb.ErrNotFound && defaultId == id {
defaultUpdated := false
// Set one of the other pairs as the default
pairs, err := pairList()
if err != nil {
logrus.Warnf("Error getting clusterpairs, will not update default: %v", err)
} else {
for _, pair := range pairs {
if pair.Id != id {
err := setDefaultPairId(pair.Id)
if err != nil {
logrus.Warnf("Error updating default clusterpair: %v", err)
} else {
defaultUpdated = true
break
}
}
}
}
if !defaultUpdated {
err = deleteDefaultPairId()
if err != nil {
return fmt.Errorf("error deleting default pair id")
}
}
}
key := ClusterPairKey + "/" + id
_, err = kv.Delete(key)
if err != nil {
return err
}
return nil
}
func pairGet(id string) (*api.ClusterPairInfo, error) {
kv := kvdb.Instance()
kvp, err := kv.Lock(ClusterPairKey)
if err != nil {
return nil, err
}
defer kv.Unlock(kvp)
key := ClusterPairKey + "/" + id
kvp, err = kv.Get(key)
if err != nil {
return nil, err
}
info := &api.ClusterPairInfo{}
err = json.Unmarshal(kvp.Value, &info)
if err != nil {
return nil, err
}
return info, nil
}