etcd2topo

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

• Variables
• func VersionFromInt(version int64) topo.Version
• type EtcdVersion
  • func (v EtcdVersion) String() string
• type Factory
  • func (f Factory) Create(cell, serverAddr, root string) (topo.Conn, error)
  • func (f Factory) HasGlobalReadOnlyCell(serverAddr, root string) bool
• type Server
  • func NewServer(serverAddr, root string) (*Server, error)
  • func (s *Server) Close()
  • func (s *Server) Create(ctx context.Context, filePath string, contents []byte) (topo.Version, error)
  • func (s *Server) Delete(ctx context.Context, filePath string, version topo.Version) error
  • func (s *Server) Get(ctx context.Context, filePath string) ([]byte, topo.Version, error)
  • func (s *Server) ListDir(ctx context.Context, dirPath string, full bool) ([]topo.DirEntry, error)
  • func (s *Server) Lock(ctx context.Context, dirPath, contents string) (topo.LockDescriptor, error)
  • func (s *Server) NewMasterParticipation(name, id string) (topo.MasterParticipation, error)
  • func (s *Server) Update(ctx context.Context, filePath string, contents []byte, version topo.Version) (topo.Version, error)
  • func (s *Server) Watch(ctx context.Context, filePath string) (*topo.WatchData, <-chan *topo.WatchData, topo.CancelFunc)

Variables

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 Factory

type Factory struct{}

Factory is the consul topo.Factory implementation.

func (Factory) Create

func (f Factory) Create(cell, serverAddr, root string) (topo.Conn, error)

Create is part of the topo.Factory interface.

func (Factory) HasGlobalReadOnlyCell

func (f Factory) HasGlobalReadOnlyCell(serverAddr, root string) bool

HasGlobalReadOnlyCell is part of the topo.Factory 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, filePath string, contents []byte) (topo.Version, error)

Create is part of the topo.Conn interface.

func (*Server) Delete

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

Delete is part of the topo.Conn interface.

func (*Server) Get

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

Get is part of the topo.Conn interface.

func (*Server) ListDir

func (s *Server) ListDir(ctx context.Context, dirPath string, full bool) ([]topo.DirEntry, error)

ListDir is part of the topo.Conn interface.

func (*Server) Lock

func (s *Server) Lock(ctx context.Context, dirPath, contents string) (topo.LockDescriptor, error)

Lock is part of the topo.Conn interface.

func (*Server) NewMasterParticipation

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

NewMasterParticipation is part of the topo.Server interface

func (*Server) Update

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

Update is part of the topo.Conn interface.

func (*Server) Watch

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

Watch is part of the topo.Conn interface.