etcdserver

package
v2.3.0-alpha.0....-d62edfb Latest Latest
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 Go to latest Published: Dec 29, 2015 License: Apache-2.0 Imports: 49 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")
)

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 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
	// ClusterVersion 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) Cluster 

func (s *EtcdServer) Cluster() Cluster

func (*EtcdServer) ClusterVersion 

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

func (*EtcdServer) Compact 

func (s *EtcdServer) Compact(ctx context.Context, r *pb.CompactionRequest) (*pb.CompactionResponse, error)

func (*EtcdServer) DeleteRange 

func (s *EtcdServer) DeleteRange(ctx context.Context, r *pb.DeleteRangeRequest) (*pb.DeleteRangeResponse, 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) IsIDRemoved 

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

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) Leader 

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

func (*EtcdServer) LeaderStats 

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

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 (s *EtcdServer) Range(ctx context.Context, r *pb.RangeRequest) (*pb.RangeResponse, error)

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

Watcable returns a watchable interface attached to the etcdserver.

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) 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

implement 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

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

RaftAttributes represents the raft related attributes of an etcd member.

type RaftKV 

type RaftKV interface {
	Range(ctx context.Context, r *pb.RangeRequest) (*pb.RangeResponse, error)
	Put(ctx context.Context, r *pb.PutRequest) (*pb.PutResponse, error)
	DeleteRange(ctx context.Context, r *pb.DeleteRangeRequest) (*pb.DeleteRangeResponse, error)
	Txn(ctx context.Context, r *pb.TxnRequest) (*pb.TxnResponse, error)
	Compact(ctx context.Context, r *pb.CompactionRequest) (*pb.CompactionResponse, error)
}

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 a 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

	V3demo bool

	StrictReconfigCheck 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

VerifyBootstrapConfig 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

Source Files

View all Source files

Directories

Path Synopsis
api
v3rpc
Package v3rpc implements etcd v3 RPC system based on gRPC.
 Package v3rpc implements etcd v3 RPC system based on gRPC.
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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