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coordinator.go
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coordinator.go
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package coordinator
import (
"common"
"datastore"
"fmt"
"parser"
"protocol"
"sync"
)
type CoordinatorImpl struct {
clusterConfiguration *ClusterConfiguration
raftServer ClusterConsensus
datastore datastore.Datastore
currentSequenceNumber uint32
sequenceNumberLock sync.Mutex
}
func NewCoordinatorImpl(datastore datastore.Datastore, raftServer ClusterConsensus, clusterConfiguration *ClusterConfiguration) *CoordinatorImpl {
return &CoordinatorImpl{
clusterConfiguration: clusterConfiguration,
raftServer: raftServer,
datastore: datastore,
}
}
func (self *CoordinatorImpl) DistributeQuery(user common.User, db string, query *parser.Query, yield func(*protocol.Series) error) error {
return self.datastore.ExecuteQuery(user, db, query, yield)
}
func (self *CoordinatorImpl) WriteSeriesData(user common.User, db string, series *protocol.Series) error {
if !user.HasWriteAccess(db) {
return common.NewAuthorizationError("Insufficient permission to write to %s", db)
}
now := common.CurrentTime()
for _, p := range series.Points {
if p.Timestamp == nil {
p.Timestamp = &now
self.sequenceNumberLock.Lock()
self.currentSequenceNumber += 1
n := self.currentSequenceNumber
self.sequenceNumberLock.Unlock()
p.SequenceNumber = &n
} else if p.SequenceNumber == nil {
self.sequenceNumberLock.Lock()
self.currentSequenceNumber += 1
n := self.currentSequenceNumber
self.sequenceNumberLock.Unlock()
p.SequenceNumber = &n
}
}
return self.datastore.WriteSeriesData(db, series)
}
func (self *CoordinatorImpl) CreateDatabase(user common.User, db string) error {
if !user.IsClusterAdmin() {
return common.NewAuthorizationError("Insufficient permission to create database")
}
err := self.raftServer.CreateDatabase(db)
if err != nil {
return err
}
return nil
}
func (self *CoordinatorImpl) ListDatabases(user common.User) ([]string, error) {
if !user.IsClusterAdmin() {
return nil, common.NewAuthorizationError("Insufficient permission to list databases")
}
dbs := self.clusterConfiguration.GetDatabases()
return dbs, nil
}
func (self *CoordinatorImpl) DropDatabase(user common.User, db string) error {
if !user.IsClusterAdmin() {
return common.NewAuthorizationError("Insufficient permission to drop database")
}
if err := self.raftServer.DropDatabase(db); err != nil {
return err
}
return self.datastore.DropDatabase(db)
}
func (self *CoordinatorImpl) AuthenticateDbUser(db, username, password string) (common.User, error) {
dbUsers := self.clusterConfiguration.dbUsers[db]
if dbUsers == nil || dbUsers[username] == nil {
return self.AuthenticateClusterAdmin(username, password)
}
user := dbUsers[username]
if user.isValidPwd(password) {
return user, nil
}
return nil, common.NewAuthorizationError("Invalid username/password")
}
func (self *CoordinatorImpl) AuthenticateClusterAdmin(username, password string) (common.User, error) {
user := self.clusterConfiguration.clusterAdmins[username]
if user == nil {
return nil, common.NewAuthorizationError("Invalid username/password")
}
if user.isValidPwd(password) {
return user, nil
}
return nil, common.NewAuthorizationError("Invalid username/password")
}
func (self *CoordinatorImpl) ListClusterAdmins(requester common.User) ([]string, error) {
if !requester.IsClusterAdmin() {
return nil, common.NewAuthorizationError("Insufficient permissions")
}
return self.clusterConfiguration.GetClusterAdmins(), nil
}
func (self *CoordinatorImpl) CreateClusterAdminUser(requester common.User, username string) error {
if !requester.IsClusterAdmin() {
return common.NewAuthorizationError("Insufficient permissions")
}
if username == "" {
return fmt.Errorf("Username cannot be empty")
}
if self.clusterConfiguration.clusterAdmins[username] != nil {
return fmt.Errorf("User %s already exists", username)
}
return self.raftServer.SaveClusterAdminUser(&clusterAdmin{CommonUser{Name: username}})
}
func (self *CoordinatorImpl) DeleteClusterAdminUser(requester common.User, username string) error {
if !requester.IsClusterAdmin() {
return common.NewAuthorizationError("Insufficient permissions")
}
user := self.clusterConfiguration.clusterAdmins[username]
if user == nil {
return fmt.Errorf("User %s doesn't exists", username)
}
user.CommonUser.IsUserDeleted = true
return self.raftServer.SaveClusterAdminUser(user)
}
func (self *CoordinatorImpl) ChangeClusterAdminPassword(requester common.User, username, password string) error {
if !requester.IsClusterAdmin() {
return common.NewAuthorizationError("Insufficient permissions")
}
user := self.clusterConfiguration.clusterAdmins[username]
if user == nil {
return fmt.Errorf("Invalid user name %s", username)
}
user.changePassword(password)
return self.raftServer.SaveClusterAdminUser(user)
}
func (self *CoordinatorImpl) CreateDbUser(requester common.User, db, username string) error {
if !requester.IsClusterAdmin() && !requester.IsDbAdmin(db) {
return common.NewAuthorizationError("Insufficient permissions")
}
if username == "" {
return fmt.Errorf("Username cannot be empty")
}
self.clusterConfiguration.CreateDatabase(db) // ignore the error since the db may exist
dbUsers := self.clusterConfiguration.dbUsers[db]
if dbUsers != nil && dbUsers[username] != nil {
return fmt.Errorf("User %s already exists", username)
}
if dbUsers == nil {
dbUsers = map[string]*dbUser{}
self.clusterConfiguration.dbUsers[db] = dbUsers
}
matchers := []*Matcher{&Matcher{true, ".*"}}
return self.raftServer.SaveDbUser(&dbUser{CommonUser{Name: username}, db, matchers, matchers, false})
}
func (self *CoordinatorImpl) DeleteDbUser(requester common.User, db, username string) error {
if !requester.IsClusterAdmin() && !requester.IsDbAdmin(db) {
return common.NewAuthorizationError("Insufficient permissions")
}
dbUsers := self.clusterConfiguration.dbUsers[db]
if dbUsers == nil || dbUsers[username] == nil {
return fmt.Errorf("User %s doesn't exists", username)
}
user := dbUsers[username]
user.CommonUser.IsUserDeleted = true
return self.raftServer.SaveDbUser(user)
}
func (self *CoordinatorImpl) ListDbUsers(requester common.User, db string) ([]string, error) {
if !requester.IsClusterAdmin() && !requester.IsDbAdmin(db) {
return nil, common.NewAuthorizationError("Insufficient permissions")
}
return self.clusterConfiguration.GetDbUsers(db), nil
}
func (self *CoordinatorImpl) ChangeDbUserPassword(requester common.User, db, username, password string) error {
if !requester.IsClusterAdmin() && !requester.IsDbAdmin(db) && !(requester.GetDb() == db && requester.GetName() == username) {
return common.NewAuthorizationError("Insufficient permissions")
}
dbUsers := self.clusterConfiguration.dbUsers[db]
if dbUsers == nil || dbUsers[username] == nil {
return fmt.Errorf("Invalid username %s", username)
}
dbUsers[username].changePassword(password)
return self.raftServer.SaveDbUser(dbUsers[username])
}
func (self *CoordinatorImpl) SetDbAdmin(requester common.User, db, username string, isAdmin bool) error {
if !requester.IsClusterAdmin() && !requester.IsDbAdmin(db) {
return common.NewAuthorizationError("Insufficient permissions")
}
dbUsers := self.clusterConfiguration.dbUsers[db]
if dbUsers == nil || dbUsers[username] == nil {
return fmt.Errorf("Invalid username %s", username)
}
user := dbUsers[username]
user.IsAdmin = isAdmin
self.raftServer.SaveDbUser(user)
return nil
}