etcdserver

package
Version: v0.0.0-...-53c5426 Latest Latest
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Published: Mar 23, 2016 License: Apache-2.0, Apache-2.0 Imports: 55 Imported by: 0

Documentation

Overview

Package etcdserver defines how etcd servers interact and store their states.

Index

Constants

View Source
const (
	DefaultSnapCount = 10000

	StoreClusterPrefix = "/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")
	ErrTimeoutDueToLeaderFail     = errors.New("etcdserver: request timed out, possibly due to previous leader failure")
	ErrTimeoutDueToConnectionLost = errors.New("etcdserver: request timed out, possibly due to connection lost")
	ErrNotEnoughStartedMembers    = errors.New("etcdserver: re-configuration failed due to not enough started members")
	ErrNoLeader                   = errors.New("etcdserver: no leader")
	ErrRequestTooLarge            = errors.New("etcdserver: request is too large")
)

Functions

func GetClusterFromRemotePeers

func GetClusterFromRemotePeers(urls []string, rt http.RoundTripper) (*cluster, error)

GetClusterFromRemotePeers 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. Each request has a 10-second timeout. Because the upper limit of TTL is 5s, 10 second is enough for building connection and finishing request.

func MemberAttributesStorePath

func MemberAttributesStorePath(id types.ID) string

func MustDetectDowngrade

func MustDetectDowngrade(cv *semver.Version)

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 Authenticator

type Authenticator interface {
	AuthEnable(ctx context.Context, r *pb.AuthEnableRequest) (*pb.AuthEnableResponse, error)
}

type Cluster

type Cluster 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
	// Version is the cluster-wide minimum major.minor version.
	Version() *semver.Version
}

type DiscoveryError

type DiscoveryError struct {
	Op  string
	Err error
}

func (DiscoveryError) Error

func (e DiscoveryError) Error() string

type EtcdServer

type EtcdServer struct {
	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) AuthEnable

func (*EtcdServer) AuthStore

func (s *EtcdServer) AuthStore() auth.AuthStore

func (*EtcdServer) Backend

func (s *EtcdServer) Backend() backend.Backend

func (*EtcdServer) Cluster

func (s *EtcdServer) Cluster() Cluster

func (*EtcdServer) ClusterVersion

func (s *EtcdServer) ClusterVersion() *semver.Version

func (*EtcdServer) Compact

func (*EtcdServer) DeleteRange

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) Hash

func (*EtcdServer) ID

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

func (*EtcdServer) Index

func (s *EtcdServer) Index() uint64

func (*EtcdServer) IsIDRemoved

func (s *EtcdServer) IsIDRemoved(id uint64) bool

func (*EtcdServer) IsPprofEnabled

func (s *EtcdServer) IsPprofEnabled() bool

func (*EtcdServer) Lead

func (s *EtcdServer) Lead() uint64

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

func (*EtcdServer) Leader

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

func (*EtcdServer) LeaderStats

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

func (*EtcdServer) LeaseCreate

func (*EtcdServer) LeaseRenew

func (s *EtcdServer) LeaseRenew(id lease.LeaseID) (int64, error)

func (*EtcdServer) LeaseRevoke

func (*EtcdServer) Lessor

func (s *EtcdServer) Lessor() lease.Lessor

func (*EtcdServer) PauseSending

func (s *EtcdServer) PauseSending()

func (*EtcdServer) Process

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

func (*EtcdServer) Put

func (s *EtcdServer) Put(ctx context.Context, r *pb.PutRequest) (*pb.PutResponse, error)

func (*EtcdServer) RaftHandler

func (s *EtcdServer) RaftHandler() http.Handler

func (*EtcdServer) Range

func (*EtcdServer) RemoveMember

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

func (*EtcdServer) ReportSnapshot

func (s *EtcdServer) ReportSnapshot(id uint64, status raft.SnapshotStatus)

ReportSnapshot reports snapshot sent status to the raft state machine, and clears the used snapshot from the snapshot store.

func (*EtcdServer) ReportUnreachable

func (s *EtcdServer) ReportUnreachable(id uint64)

func (*EtcdServer) ResumeSending

func (s *EtcdServer) ResumeSending()

func (*EtcdServer) SelfStats

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

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) Txn

func (s *EtcdServer) Txn(ctx context.Context, r *pb.TxnRequest) (*pb.TxnResponse, error)

func (*EtcdServer) UpdateMember

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

func (*EtcdServer) Watchable

func (s *EtcdServer) Watchable() dstorage.Watchable

Watchable returns a watchable interface attached to the etcdserver.

type Lessor

type Lessor interface {
	// LeaseCreate sends LeaseCreate request to raft and apply it after committed.
	LeaseCreate(ctx context.Context, r *pb.LeaseCreateRequest) (*pb.LeaseCreateResponse, error)
	// LeaseRevoke sends LeaseRevoke request to raft and apply it after committed.
	LeaseRevoke(ctx context.Context, r *pb.LeaseRevokeRequest) (*pb.LeaseRevokeResponse, error)

	// LeaseRenew renews the lease with given ID. The renewed TTL is returned. Or an error
	// is returned.
	LeaseRenew(id lease.LeaseID) (int64, 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 cluster name, peer URLs, and time. This is used for bootstrapping/adding new member.

func (*Member) Clone

func (m *Member) Clone() *Member

func (*Member) IsStarted

func (m *Member) IsStarted() bool

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 MembersByID

type MembersByID []*Member

MembersByID implements sort by ID interface

func (MembersByID) Len

func (ms MembersByID) Len() int

func (MembersByID) Less

func (ms MembersByID) Less(i, j int) bool

func (MembersByID) Swap

func (ms MembersByID) Swap(i, j int)

type MembersByPeerURLs

type MembersByPeerURLs []*Member

MembersByPeerURLs implements sort by peer urls interface

func (MembersByPeerURLs) Len

func (ms MembersByPeerURLs) Len() int

func (MembersByPeerURLs) Less

func (ms MembersByPeerURLs) Less(i, j int) bool

func (MembersByPeerURLs) Swap

func (ms MembersByPeerURLs) Swap(i, j int)

type RaftAttributes

type RaftAttributes struct {
	// PeerURLs is the list of peers in the raft cluster.
	// 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 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
	// Leader returns the ID of the leader Server.
	Leader() 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 an existing member in the cluster. It will
	// return ErrIDNotFound if the member ID does not exist.
	UpdateMember(ctx context.Context, updateMemb Member) error

	// ClusterVersion is the cluster-wide minimum major.minor version.
	// Cluster version is set to the min version that an etcd member is
	// compatible with when first bootstrap.
	//
	// ClusterVersion is nil until the cluster is bootstrapped (has a quorum).
	//
	// During a rolling upgrades, the ClusterVersion will be updated
	// automatically after a sync. (5 second by default)
	//
	// The API/raft component can utilize ClusterVersion to determine if
	// it can accept a client request or a raft RPC.
	// NOTE: ClusterVersion might be nil when etcd 2.1 works with etcd 2.0 and
	// the leader is etcd 2.0. etcd 2.0 leader will not update clusterVersion since
	// this feature is introduced post 2.0.
	ClusterVersion() *semver.Version
}

type ServerConfig

type ServerConfig struct {
	Name           string
	DiscoveryURL   string
	DiscoveryProxy string
	ClientURLs     types.URLs
	PeerURLs       types.URLs
	DataDir        string
	// DedicatedWALDir config will make the etcd to write the WAL to the WALDir
	// rather than the dataDir/member/wal.
	DedicatedWALDir     string
	SnapCount           uint64
	MaxSnapFiles        uint
	MaxWALFiles         uint
	InitialPeerURLsMap  types.URLsMap
	InitialClusterToken string
	NewCluster          bool
	ForceNewCluster     bool
	PeerTLSInfo         transport.TLSInfo

	TickMs           uint
	ElectionTicks    int
	BootstrapTimeout time.Duration

	V3demo                  bool
	AutoCompactionRetention int

	StrictReconfigCheck bool

	EnablePprof bool
}

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

func (*ServerConfig) MemberDir

func (c *ServerConfig) MemberDir() string

func (*ServerConfig) Print

func (c *ServerConfig) Print()

func (*ServerConfig) PrintWithInitial

func (c *ServerConfig) PrintWithInitial()

func (*ServerConfig) ReqTimeout

func (c *ServerConfig) ReqTimeout() time.Duration

ReqTimeout returns timeout for request to finish.

func (*ServerConfig) ShouldDiscover

func (c *ServerConfig) ShouldDiscover() bool

func (*ServerConfig) SnapDir

func (c *ServerConfig) SnapDir() string

func (*ServerConfig) VerifyBootstrap

func (c *ServerConfig) VerifyBootstrap() error

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

func (*ServerConfig) VerifyJoinExisting

func (c *ServerConfig) VerifyJoinExisting() error

VerifyJoinExisting sanity-checks the initial config for join existing cluster case and returns an error for things that should never happen.

func (*ServerConfig) WALDir

func (c *ServerConfig) WALDir() string

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
	// DBFilePath returns the file path of database snapshot saved with given
	// id.
	DBFilePath(id uint64) (string, error)
	// Close closes the Storage and performs finalization.
	Close() error
}

func NewStorage

func NewStorage(w *wal.WAL, s *snap.Snapshotter) Storage

Directories

Path Synopsis
api
Package auth implements etcd authentication.
Package auth implements etcd authentication.
Package etcdhttp provides etcd client and server implementations.
Package etcdhttp provides etcd client and server implementations.
httptypes
Package httptypes defines how etcd's HTTP API entities are serialized to and deserialized from JSON.
Package httptypes defines how etcd's HTTP API entities are serialized to and deserialized from JSON.
Package etcdserverpb is a generated protocol buffer package.
Package etcdserverpb is a generated protocol buffer package.
Package stats defines a standard interface for etcd cluster statistics.
Package stats defines a standard interface for etcd cluster statistics.

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