etcd2topo

package
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 Go to latest Published: May 22, 2017 License: BSD-3-Clause Imports: 19 Imported by: 0

Documentation

Overview

Package etcd2topo implements topo.Server with etcd as the backend.

We expect the following behavior from the etcd client library:

  • Get and Delete return ErrorCodeKeyNotFound if the node doesn't exist.
  • Create returns ErrorCodeNodeExist if the node already exists.
  • Intermediate directories are always created automatically if necessary.
  • Set returns ErrorCodeKeyNotFound if the node doesn't exist already.
  • It returns ErrorCodeTestFailed if the provided version index doesn't match.

We follow these conventions within this package:

  • Call convertError(err) on any errors returned from the etcd client library. Functions defined in this package can be assumed to have already converted errors as necessary.

Index

Constants

This section is empty.

Variables

View Source 
var (
	// ErrBadResponse is returned from this package if the response from the etcd
	// server does not contain the data that the API promises. The etcd client
	// unmarshals JSON from the server into a Response struct that uses pointers,
	// so we need to check for nil pointers, or else a misbehaving etcd could
	// cause us to panic.
	ErrBadResponse = errors.New("etcd request returned success, but response is missing required data")
)

Errors specific to this package.

Functions

func VersionFromInt 

func VersionFromInt(version int64) topo.Version

VersionFromInt is used by old-style functions to create a proper Version: if version is -1, returns nil. Otherwise returns the EtcdVersion object.

Types

type EtcdVersion 

type EtcdVersion int64

EtcdVersion is etcd's idea of a version. It implements topo.Version. We use the native etcd version type, int64.

func (EtcdVersion) String 

func (v EtcdVersion) String() string

String is part of the topo.Version interface.

type Server 

type Server struct {
	// contains filtered or unexported fields
}

Server is the implementation of topo.Server for etcd.

func NewServer 

func NewServer(serverAddr, root string) (*Server, error)

NewServer returns a new etcdtopo.Server.

func (*Server) Close 

func (s *Server) Close()

Close implements topo.Server.Close. It will nil out the global and cells fields, so any attempt to re-use this server will panic.

func (*Server) Create 

func (s *Server) Create(ctx context.Context, cell, filePath string, contents []byte) (topo.Version, error)

Create is part of the topo.Backend interface.

func (*Server) CreateKeyspace 

func (s *Server) CreateKeyspace(ctx context.Context, keyspace string, value *topodatapb.Keyspace) error

CreateKeyspace implements topo.Server.

func (*Server) CreateShard 

func (s *Server) CreateShard(ctx context.Context, keyspace, shard string, value *topodatapb.Shard) error

CreateShard implements topo.Server.

func (*Server) CreateTablet 

func (s *Server) CreateTablet(ctx context.Context, tablet *topodatapb.Tablet) error

CreateTablet implements topo.Server.

func (*Server) Delete 

func (s *Server) Delete(ctx context.Context, cell, filePath string, version topo.Version) error

Delete is part of the topo.Backend interface.

func (*Server) DeleteKeyspace 

func (s *Server) DeleteKeyspace(ctx context.Context, keyspace string) error

DeleteKeyspace implements topo.Server.

func (*Server) DeleteKeyspaceReplication 

func (s *Server) DeleteKeyspaceReplication(ctx context.Context, cell, keyspace string) error

DeleteKeyspaceReplication implements topo.Server.

func (*Server) DeleteShard 

func (s *Server) DeleteShard(ctx context.Context, keyspace, shard string) error

DeleteShard implements topo.Server.

func (*Server) DeleteShardReplication 

func (s *Server) DeleteShardReplication(ctx context.Context, cell, keyspace, shard string) error

DeleteShardReplication implements topo.Server.

func (*Server) DeleteSrvKeyspace 

func (s *Server) DeleteSrvKeyspace(ctx context.Context, cell, keyspace string) error

DeleteSrvKeyspace implements topo.Server.

func (*Server) DeleteTablet 

func (s *Server) DeleteTablet(ctx context.Context, alias *topodatapb.TabletAlias) error

DeleteTablet implements topo.Server.

func (*Server) Get 

func (s *Server) Get(ctx context.Context, cell, filePath string) ([]byte, topo.Version, error)

Get is part of the topo.Backend interface.

func (*Server) GetKeyspace 

func (s *Server) GetKeyspace(ctx context.Context, keyspace string) (*topodatapb.Keyspace, int64, error)

GetKeyspace implements topo.Server.

func (*Server) GetKeyspaces 

func (s *Server) GetKeyspaces(ctx context.Context) ([]string, error)

GetKeyspaces implements topo.Server.

func (*Server) GetKnownCells 

func (s *Server) GetKnownCells(ctx context.Context) ([]string, error)

GetKnownCells implements topo.Server.GetKnownCells.

func (*Server) GetShard 

func (s *Server) GetShard(ctx context.Context, keyspace, shard string) (*topodatapb.Shard, int64, error)

GetShard implements topo.Server.

func (*Server) GetShardNames 

func (s *Server) GetShardNames(ctx context.Context, keyspace string) ([]string, error)

GetShardNames implements topo.Server.

func (*Server) GetShardReplication 

func (s *Server) GetShardReplication(ctx context.Context, cell, keyspace, shard string) (*topo.ShardReplicationInfo, error)

GetShardReplication implements topo.Server.

func (*Server) GetSrvKeyspace 

func (s *Server) GetSrvKeyspace(ctx context.Context, cell, keyspace string) (*topodatapb.SrvKeyspace, error)

GetSrvKeyspace implements topo.Server.

func (*Server) GetSrvKeyspaceNames 

func (s *Server) GetSrvKeyspaceNames(ctx context.Context, cell string) ([]string, error)

GetSrvKeyspaceNames implements topo.Server.

func (*Server) GetSrvVSchema 

func (s *Server) GetSrvVSchema(ctx context.Context, cell string) (*vschemapb.SrvVSchema, error)

GetSrvVSchema implements topo.Server.

func (*Server) GetTablet 

func (s *Server) GetTablet(ctx context.Context, alias *topodatapb.TabletAlias) (*topodatapb.Tablet, int64, error)

GetTablet implements topo.Server.

func (*Server) GetTabletsByCell 

func (s *Server) GetTabletsByCell(ctx context.Context, cell string) ([]*topodatapb.TabletAlias, error)

GetTabletsByCell implements topo.Server.

func (*Server) GetVSchema 

func (s *Server) GetVSchema(ctx context.Context, keyspace string) (*vschemapb.Keyspace, error)

GetVSchema fetches the vschema from the topo.

func (*Server) ListDir 

func (s *Server) ListDir(ctx context.Context, cell, dirPath string) ([]string, error)

ListDir is part of the topo.Backend interface.

func (*Server) LockKeyspaceForAction 

func (s *Server) LockKeyspaceForAction(ctx context.Context, keyspace, contents string) (string, error)

LockKeyspaceForAction implements topo.Server.

func (*Server) LockShardForAction 

func (s *Server) LockShardForAction(ctx context.Context, keyspace, shard, contents string) (string, error)

LockShardForAction implements topo.Server.

func (*Server) NewMasterParticipation 

func (s *Server) NewMasterParticipation(name, id string) (topo.MasterParticipation, error)

NewMasterParticipation is part of the topo.Server interface

func (*Server) SaveVSchema 

func (s *Server) SaveVSchema(ctx context.Context, keyspace string, vschema *vschemapb.Keyspace) error

SaveVSchema saves the JSON vschema into the topo.

func (*Server) UnlockKeyspaceForAction 

func (s *Server) UnlockKeyspaceForAction(ctx context.Context, keyspace, actionPath, results string) error

UnlockKeyspaceForAction implements topo.Server.

func (*Server) UnlockShardForAction 

func (s *Server) UnlockShardForAction(ctx context.Context, keyspace, shard, actionPath, results string) error

UnlockShardForAction implements topo.Server.

func (*Server) Update 

func (s *Server) Update(ctx context.Context, cell, filePath string, contents []byte, version topo.Version) (topo.Version, error)

Update is part of the topo.Backend interface.

func (*Server) UpdateKeyspace 

func (s *Server) UpdateKeyspace(ctx context.Context, keyspace string, value *topodatapb.Keyspace, existingVersion int64) (int64, error)

UpdateKeyspace implements topo.Server.

func (*Server) UpdateShard 

func (s *Server) UpdateShard(ctx context.Context, keyspace, shard string, value *topodatapb.Shard, existingVersion int64) (int64, error)

UpdateShard implements topo.Server.

func (*Server) UpdateShardReplicationFields 

func (s *Server) UpdateShardReplicationFields(ctx context.Context, cell, keyspace, shard string, update func(*topodatapb.ShardReplication) error) error

UpdateShardReplicationFields implements topo.Server.

func (*Server) UpdateSrvKeyspace 

func (s *Server) UpdateSrvKeyspace(ctx context.Context, cell, keyspace string, srvKeyspace *topodatapb.SrvKeyspace) error

UpdateSrvKeyspace implements topo.Server.

func (*Server) UpdateSrvVSchema 

func (s *Server) UpdateSrvVSchema(ctx context.Context, cell string, srvVSchema *vschemapb.SrvVSchema) error

UpdateSrvVSchema implements topo.Server.

func (*Server) UpdateTablet 

func (s *Server) UpdateTablet(ctx context.Context, tablet *topodatapb.Tablet, existingVersion int64) (int64, error)

UpdateTablet implements topo.Server.

func (*Server) Watch 

func (s *Server) Watch(ctx context.Context, cell, filePath string) (*topo.WatchData, <-chan *topo.WatchData, topo.CancelFunc)

Watch is part of the topo.Backend interface

Source Files

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