etcdserver

package
v0.5.0-alpha.4 Latest Latest
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 Go to latest Published: Nov 26, 2014 License: Apache-2.0 Imports: 36 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	DefaultSnapCount = 10000

	StoreAdminPrefix = "/0"
	StoreKeysPrefix  = "/1"
)

Variables

View Source 
var (
	ErrUnknownMethod = errors.New("etcdserver: unknown method")
	ErrStopped       = errors.New("etcdserver: server stopped")
	ErrIDRemoved     = errors.New("etcdserver: ID removed")
	ErrIDExists      = errors.New("etcdserver: ID exists")
	ErrIDNotFound    = errors.New("etcdserver: ID not found")
	ErrPeerURLexists = errors.New("etcdserver: peerURL exists")
	ErrCanceled      = errors.New("etcdserver: request cancelled")
	ErrTimeout       = errors.New("etcdserver: request timed out")
)

Functions

func GenID 

func GenID() (n uint64)

TODO: move the function to /id pkg maybe? GenID generates a random id that is not equal to 0.

func MemberAttributesStorePath 

func MemberAttributesStorePath(id types.ID) string

func UpgradeWAL 

func UpgradeWAL(cfg *ServerConfig, ver wal.WalVersion) error

UpgradeWAL converts an older version of the EtcdServer data to the newest version. It must ensure that, after upgrading, the most recent version is present.

func ValidateClusterAndAssignIDs 

func ValidateClusterAndAssignIDs(local *Cluster, existing *Cluster) error

ValidateClusterAndAssignIDs validates the local cluster by matching the PeerURLs with the existing cluster. If the validation succeeds, it assigns the IDs from the existing cluster to the local cluster. If the validation fails, an error will be returned.

Types

type Attributes 

type Attributes struct {
	Name       string   `json:"name,omitempty"`
	ClientURLs []string `json:"clientURLs,omitempty"`
}

Attributes represents all the non-raft related attributes of an etcd member.

type Cluster 

type Cluster struct {
	sync.Mutex
	// contains filtered or unexported fields
}

Cluster is a list of Members that belong to the same raft cluster

func GetClusterFromPeers 

func GetClusterFromPeers(urls []string) (*Cluster, error)

GetClusterFromPeers takes a set of URLs representing etcd peers, and attempts to construct a Cluster by accessing the members endpoint on one of these URLs. The first URL to provide a response is used. If no URLs provide a response, or a Cluster cannot be successfully created from a received response, an error is returned.

func NewClusterFromMembers 

func NewClusterFromMembers(token string, id types.ID, membs []*Member) *Cluster

func NewClusterFromStore 

func NewClusterFromStore(token string, st store.Store) *Cluster

func NewClusterFromString 

func NewClusterFromString(token string, cluster string) (*Cluster, error)

NewClusterFromString returns a Cluster instantiated from the given cluster token and cluster string, by parsing members from a set of discovery-formatted names-to-IPs, like: mach0=http://1.1.1.1,mach0=http://2.2.2.2,mach1=http://3.3.3.3,mach2=http://4.4.4.4

func (*Cluster) AddMember 

func (c *Cluster) AddMember(m *Member)

AddMember adds a new Member into the cluster, and saves the given member's raftAttributes into the store. The given member should have empty attributes. A Member with a matching id must not exist.

func (*Cluster) ClientURLs 

func (c *Cluster) ClientURLs() []string

ClientURLs returns a list of all client addresses. Each address is prefixed with the scheme (currently "http://"). The returned list is sorted in ascending lexicographical order.

func (*Cluster) ID 

func (c *Cluster) ID() types.ID

func (*Cluster) IsIDRemoved 

func (c *Cluster) IsIDRemoved(id types.ID) bool

func (*Cluster) Member 

func (c *Cluster) Member(id types.ID) *Member

func (*Cluster) MemberByName 

func (c *Cluster) MemberByName(name string) *Member

MemberByName returns a Member with the given name if exists. If more than one member has the given name, it will panic.

func (*Cluster) MemberIDs 

func (c *Cluster) MemberIDs() []types.ID

func (*Cluster) Members 

func (c *Cluster) Members() []*Member

func (*Cluster) PeerURLs 

func (c *Cluster) PeerURLs() []string

PeerURLs returns a list of all peer addresses. Each address is prefixed with the scheme (currently "http://"). The returned list is sorted in ascending lexicographical order.

func (*Cluster) Recover 

func (c *Cluster) Recover()

func (*Cluster) RemoveMember 

func (c *Cluster) RemoveMember(id types.ID)

RemoveMember removes a member from the store. The given id MUST exist, or the function panics.

func (*Cluster) SetID 

func (c *Cluster) SetID(id types.ID)

func (*Cluster) SetStore 

func (c *Cluster) SetStore(st store.Store)

func (*Cluster) String 

func (c *Cluster) String() string

func (*Cluster) UpdateMember 

func (c *Cluster) UpdateMember(nm *Member)

func (*Cluster) UpdateMemberAttributes 

func (c *Cluster) UpdateMemberAttributes(id types.ID, attr Attributes)

func (*Cluster) ValidateConfigurationChange 

func (c *Cluster) ValidateConfigurationChange(cc raftpb.ConfChange) error

ValidateConfigurationChange takes a proposed ConfChange and ensures that it is still valid.

type ClusterInfo 

type ClusterInfo interface {
	// ID returns the cluster ID
	ID() types.ID
	// ClientURLs returns an aggregate set of all URLs on which this
	// cluster is listening for client requests
	ClientURLs() []string
	// Members returns a slice of members sorted by their ID
	Members() []*Member
	// Member retrieves a particular member based on ID, or nil if the
	// member does not exist in the cluster
	Member(id types.ID) *Member
	// IsIDRemoved checks whether the given ID has been removed from this
	// cluster at some point in the past
	IsIDRemoved(id types.ID) bool
}

type EtcdServer 

type EtcdServer struct {
	Cluster *Cluster

	Ticker     <-chan time.Time
	SyncTicker <-chan time.Time
	// contains filtered or unexported fields
}

EtcdServer is the production implementation of the Server interface

func NewServer 

func NewServer(cfg *ServerConfig) (*EtcdServer, error)

NewServer creates a new EtcdServer from the supplied configuration. The configuration is considered static for the lifetime of the EtcdServer.

func (*EtcdServer) AddMember 

func (s *EtcdServer) AddMember(ctx context.Context, memb Member) error

func (*EtcdServer) Do 

func (s *EtcdServer) Do(ctx context.Context, r pb.Request) (Response, error)

Do interprets r and performs an operation on s.store according to r.Method and other fields. If r.Method is "POST", "PUT", "DELETE", or a "GET" with Quorum == true, r will be sent through consensus before performing its respective operation. Do will block until an action is performed or there is an error.

func (*EtcdServer) ID 

func (s *EtcdServer) ID() types.ID

func (*EtcdServer) Index 

func (s *EtcdServer) Index() uint64

Implement the RaftTimer interface

func (*EtcdServer) Lead 

func (s *EtcdServer) Lead() uint64

Only for testing purpose TODO: add Raft server interface to expose raft related info: Index, Term, Lead, Committed, Applied, LastIndex, etc.

func (*EtcdServer) LeaderStats 

func (s *EtcdServer) LeaderStats() []byte

func (*EtcdServer) Process 

func (s *EtcdServer) Process(ctx context.Context, m raftpb.Message) error

func (*EtcdServer) RemoveMember 

func (s *EtcdServer) RemoveMember(ctx context.Context, id uint64) error

func (*EtcdServer) SelfStats 

func (s *EtcdServer) SelfStats() []byte

func (*EtcdServer) SenderFinder 

func (s *EtcdServer) SenderFinder() rafthttp.SenderFinder

func (*EtcdServer) Start 

func (s *EtcdServer) Start()

Start prepares and starts server in a new goroutine. It is no longer safe to modify a server's fields after it has been sent to Start. It also starts a goroutine to publish its server information.

func (*EtcdServer) Stop 

func (s *EtcdServer) Stop()

Stop stops the server gracefully, and shuts down the running goroutine. Stop should be called after a Start(s), otherwise it will block forever.

func (*EtcdServer) StopNotify 

func (s *EtcdServer) StopNotify() <-chan struct{}

StopNotify returns a channel that receives a empty struct when the server is stopped.

func (*EtcdServer) StoreStats 

func (s *EtcdServer) StoreStats() []byte

func (*EtcdServer) Term 

func (s *EtcdServer) Term() uint64

func (*EtcdServer) UpdateMember 

func (s *EtcdServer) UpdateMember(ctx context.Context, memb Member) error

type Member 

type Member struct {
	ID types.ID `json:"id"`
	RaftAttributes
	Attributes
}

func NewMember 

func NewMember(name string, peerURLs types.URLs, clusterName string, now *time.Time) *Member

NewMember creates a Member without an ID and generates one based on the name, peer URLs. This is used for bootstrapping/adding new member.

func (*Member) Clone 

func (m *Member) Clone() *Member

func (*Member) PickPeerURL 

func (m *Member) PickPeerURL() string

PickPeerURL chooses a random address from a given Member's PeerURLs. It will panic if there is no PeerURLs available in Member.

type RaftAttributes 

type RaftAttributes struct {
	// TODO(philips): ensure these are URLs
	PeerURLs []string `json:"peerURLs"`
}

RaftAttributes represents the raft related attributes of an etcd member.

type RaftTimer 

type RaftTimer interface {
	Index() uint64
	Term() uint64
}

type Response 

type Response struct {
	Event   *store.Event
	Watcher store.Watcher
	// contains filtered or unexported fields
}

type SendHub 

type SendHub interface {
	rafthttp.SenderFinder
	Send(m []raftpb.Message)
	Add(m *Member)
	Remove(id types.ID)
	Update(m *Member)
	Stop()
	ShouldStopNotify() <-chan struct{}
}

type Server 

type Server interface {
	// Start performs any initialization of the Server necessary for it to
	// begin serving requests. It must be called before Do or Process.
	// Start must be non-blocking; any long-running server functionality
	// should be implemented in goroutines.
	Start()
	// Stop terminates the Server and performs any necessary finalization.
	// Do and Process cannot be called after Stop has been invoked.
	Stop()
	// ID returns the ID of the Server.
	ID() types.ID
	// Do takes a request and attempts to fulfill it, returning a Response.
	Do(ctx context.Context, r pb.Request) (Response, error)
	// Process takes a raft message and applies it to the server's raft state
	// machine, respecting any timeout of the given context.
	Process(ctx context.Context, m raftpb.Message) error
	// AddMember attempts to add a member into the cluster. It will return
	// ErrIDRemoved if member ID is removed from the cluster, or return
	// ErrIDExists if member ID exists in the cluster.
	AddMember(ctx context.Context, memb Member) error
	// RemoveMember attempts to remove a member from the cluster. It will
	// return ErrIDRemoved if member ID is removed from the cluster, or return
	// ErrIDNotFound if member ID is not in the cluster.
	RemoveMember(ctx context.Context, id uint64) error

	// UpdateMember attempts to update a existing member in the cluster. It will
	// return ErrIDNotFound if the member ID does not exist.
	UpdateMember(ctx context.Context, updateMemb Member) error
}

type ServerConfig 

type ServerConfig struct {
	Name            string
	DiscoveryURL    string
	DiscoveryProxy  string
	ClientURLs      types.URLs
	PeerURLs        types.URLs
	DataDir         string
	SnapCount       uint64
	Cluster         *Cluster
	NewCluster      bool
	ForceNewCluster bool
	Transport       *http.Transport
}

ServerConfig holds the configuration of etcd as taken from the command line or discovery.

func (*ServerConfig) Print 

func (c *ServerConfig) Print()

func (*ServerConfig) PrintWithInitial 

func (c *ServerConfig) PrintWithInitial()

func (*ServerConfig) ShouldDiscover 

func (c *ServerConfig) ShouldDiscover() bool

func (*ServerConfig) SnapDir 

func (c *ServerConfig) SnapDir() string

func (*ServerConfig) VerifyBootstrapConfig 

func (c *ServerConfig) VerifyBootstrapConfig() error

VerifyBootstrapConfig sanity-checks the initial config and returns an error for things that should never happen.

func (*ServerConfig) WALDir 

func (c *ServerConfig) WALDir() string

type SortableMemberSlice 

type SortableMemberSlice []*Member

func (SortableMemberSlice) Len 

func (s SortableMemberSlice) Len() int

func (SortableMemberSlice) Less 

func (s SortableMemberSlice) Less(i, j int) bool

func (SortableMemberSlice) Swap 

func (s SortableMemberSlice) Swap(i, j int)

type SortableMemberSliceByPeerURLs 

type SortableMemberSliceByPeerURLs []*Member

func (SortableMemberSliceByPeerURLs) Len 

func (p SortableMemberSliceByPeerURLs) Len() int

func (SortableMemberSliceByPeerURLs) Less 

func (p SortableMemberSliceByPeerURLs) Less(i, j int) bool

func (SortableMemberSliceByPeerURLs) Swap 

func (p SortableMemberSliceByPeerURLs) Swap(i, j int)

type Stats 

type Stats interface {
	// SelfStats returns the struct representing statistics of this server
	SelfStats() []byte
	// LeaderStats returns the statistics of all followers in the cluster
	// if this server is leader. Otherwise, nil is returned.
	LeaderStats() []byte
	// StoreStats returns statistics of the store backing this EtcdServer
	StoreStats() []byte
}

type Storage 

type Storage interface {
	// Save function saves ents and state to the underlying stable storage.
	// Save MUST block until st and ents are on stable storage.
	Save(st raftpb.HardState, ents []raftpb.Entry) error
	// SaveSnap function saves snapshot to the underlying stable storage.
	SaveSnap(snap raftpb.Snapshot) error

	// TODO: WAL should be able to control cut itself. After implement self-controled cut,
	// remove it in this interface.
	// Cut cuts out a new wal file for saving new state and entries.
	Cut() error
}

Source Files

View all Source files

Directories

Path Synopsis
httptypes
Package etcdserverpb is a generated protocol buffer package.
 Package etcdserverpb is a generated protocol buffer package.

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