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command.go
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command.go
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package coordinator
import (
log "code.google.com/p/log4go"
"github.com/goraft/raft"
"time"
)
var internalRaftCommands map[string]raft.Command
func init() {
internalRaftCommands = map[string]raft.Command{}
for _, command := range []raft.Command{
&AddPotentialServerCommand{},
&UpdateServerStateCommand{},
&CreateDatabaseCommand{},
&DropDatabaseCommand{},
&SaveDbUserCommand{},
&SaveClusterAdminCommand{},
&ChangeDbUserPassword{},
&CreateContinuousQueryCommand{},
&DeleteContinuousQueryCommand{},
&SetContinuousQueryTimestampCommand{},
} {
internalRaftCommands[command.CommandName()] = command
}
}
type SetContinuousQueryTimestampCommand struct {
Timestamp time.Time `json:"timestamp"`
}
func NewSetContinuousQueryTimestampCommand(timestamp time.Time) *SetContinuousQueryTimestampCommand {
return &SetContinuousQueryTimestampCommand{timestamp}
}
func (c *SetContinuousQueryTimestampCommand) CommandName() string {
return "set_cq_ts"
}
func (c *SetContinuousQueryTimestampCommand) Apply(server raft.Server) (interface{}, error) {
config := server.Context().(*ClusterConfiguration)
err := config.SetContinuousQueryTimestamp(c.Timestamp)
return nil, err
}
type CreateContinuousQueryCommand struct {
Database string `json:"database"`
Query string `json:"query"`
}
func NewCreateContinuousQueryCommand(database string, query string) *CreateContinuousQueryCommand {
return &CreateContinuousQueryCommand{database, query}
}
func (c *CreateContinuousQueryCommand) CommandName() string {
return "create_cq"
}
func (c *CreateContinuousQueryCommand) Apply(server raft.Server) (interface{}, error) {
config := server.Context().(*ClusterConfiguration)
err := config.CreateContinuousQuery(c.Database, c.Query)
return nil, err
}
type DeleteContinuousQueryCommand struct {
Database string `json:"database"`
Id uint32 `json:"id"`
}
func NewDeleteContinuousQueryCommand(database string, id uint32) *DeleteContinuousQueryCommand {
return &DeleteContinuousQueryCommand{database, id}
}
func (c *DeleteContinuousQueryCommand) CommandName() string {
return "delete_cq"
}
func (c *DeleteContinuousQueryCommand) Apply(server raft.Server) (interface{}, error) {
config := server.Context().(*ClusterConfiguration)
err := config.DeleteContinuousQuery(c.Database, c.Id)
return nil, err
}
type DropDatabaseCommand struct {
Name string `json:"name"`
}
func NewDropDatabaseCommand(name string) *DropDatabaseCommand {
return &DropDatabaseCommand{name}
}
func (c *DropDatabaseCommand) CommandName() string {
return "drop_db"
}
func (c *DropDatabaseCommand) Apply(server raft.Server) (interface{}, error) {
config := server.Context().(*ClusterConfiguration)
err := config.DropDatabase(c.Name)
return nil, err
}
type CreateDatabaseCommand struct {
Name string `json:"name"`
ReplicationFactor uint8 `json:"replicationFactor"`
}
func NewCreateDatabaseCommand(name string, replicationFactor uint8) *CreateDatabaseCommand {
return &CreateDatabaseCommand{name, replicationFactor}
}
func (c *CreateDatabaseCommand) CommandName() string {
return "create_db"
}
func (c *CreateDatabaseCommand) Apply(server raft.Server) (interface{}, error) {
config := server.Context().(*ClusterConfiguration)
err := config.CreateDatabase(c.Name, c.ReplicationFactor)
return nil, err
}
type SaveDbUserCommand struct {
User *dbUser `json:"user"`
}
func NewSaveDbUserCommand(u *dbUser) *SaveDbUserCommand {
return &SaveDbUserCommand{
User: u,
}
}
func (c *SaveDbUserCommand) CommandName() string {
return "save_db_user"
}
func (c *SaveDbUserCommand) Apply(server raft.Server) (interface{}, error) {
config := server.Context().(*ClusterConfiguration)
config.SaveDbUser(c.User)
log.Debug("(raft:%s) Created user %s:%s", server.Name(), c.User.Db, c.User.Name)
return nil, nil
}
type ChangeDbUserPassword struct {
Database string
Username string
Hash string
}
func NewChangeDbUserPasswordCommand(db, username, hash string) *ChangeDbUserPassword {
return &ChangeDbUserPassword{
Database: db,
Username: username,
Hash: hash,
}
}
func (c *ChangeDbUserPassword) CommandName() string {
return "change_db_user_password"
}
func (c *ChangeDbUserPassword) Apply(server raft.Server) (interface{}, error) {
log.Debug("(raft:%s) changing db user password for %s:%s", server.Name(), c.Database, c.Username)
config := server.Context().(*ClusterConfiguration)
return nil, config.ChangeDbUserPassword(c.Database, c.Username, c.Hash)
}
type SaveClusterAdminCommand struct {
User *clusterAdmin `json:"user"`
}
func NewSaveClusterAdminCommand(u *clusterAdmin) *SaveClusterAdminCommand {
return &SaveClusterAdminCommand{
User: u,
}
}
func (c *SaveClusterAdminCommand) CommandName() string {
return "save_cluster_admin_user"
}
func (c *SaveClusterAdminCommand) Apply(server raft.Server) (interface{}, error) {
config := server.Context().(*ClusterConfiguration)
config.SaveClusterAdmin(c.User)
return nil, nil
}
type AddPotentialServerCommand struct {
Server *ClusterServer
}
func NewAddPotentialServerCommand(s *ClusterServer) *AddPotentialServerCommand {
return &AddPotentialServerCommand{Server: s}
}
func (c *AddPotentialServerCommand) CommandName() string {
return "add_server"
}
func (c *AddPotentialServerCommand) Apply(server raft.Server) (interface{}, error) {
config := server.Context().(*ClusterConfiguration)
config.AddPotentialServer(c.Server)
return nil, nil
}
type UpdateServerStateCommand struct {
ServerId uint32
State ServerState
}
func NewUpdateServerStateCommand(serverId uint32, state ServerState) *UpdateServerStateCommand {
return &UpdateServerStateCommand{ServerId: serverId, State: state}
}
func (c *UpdateServerStateCommand) CommandName() string {
return "update_state"
}
func (c *UpdateServerStateCommand) Apply(server raft.Server) (interface{}, error) {
config := server.Context().(*ClusterConfiguration)
err := config.UpdateServerState(c.ServerId, c.State)
return nil, err
}
type InfluxJoinCommand struct {
Name string `json:"name"`
ConnectionString string `json:"connectionString"`
ProtobufConnectionString string `json:"protobufConnectionString"`
}
// The name of the Join command in the log
func (c *InfluxJoinCommand) CommandName() string {
return "raft:join"
}
func (c *InfluxJoinCommand) Apply(server raft.Server) (interface{}, error) {
err := server.AddPeer(c.Name, c.ConnectionString)
return []byte("join"), err
}
func (c *InfluxJoinCommand) NodeName() string {
return c.Name
}