Documentation ¶
Overview ¶
Package store provides a distributed SQLite instance.
Distributed consensus is provided via the Raft algorithm.
Index ¶
- Variables
- func JoinAllowed(raftDir string) (bool, error)
- func NumPeers(raftDir string) (int, error)
- type BackupFormat
- type ClusterState
- type ConsistencyLevel
- type DBConfig
- type ExecuteRequest
- type QueryRequest
- type Store
- func (s *Store) APIPeers() (map[string]string, error)
- func (s *Store) Addr() net.Addr
- func (s *Store) Apply(l *raft.Log) interface{}
- func (s *Store) Backup(leader bool, fmt BackupFormat) ([]byte, error)
- func (s *Store) Close(wait bool) error
- func (s *Store) Database(leader bool) ([]byte, error)
- func (s *Store) DeregisterObserver(o *raft.Observer)
- func (s *Store) Execute(ex *ExecuteRequest) ([]*sql.Result, error)
- func (s *Store) ExecuteOrAbort(ex *ExecuteRequest) (results []*sql.Result, retErr error)
- func (s *Store) IsLeader() bool
- func (s *Store) Join(addr string) error
- func (s *Store) JoinRequired() bool
- func (s *Store) Leader() string
- func (s *Store) Nodes() ([]string, error)
- func (s *Store) Open(enableSingle bool) error
- func (s *Store) Path() string
- func (s *Store) Peer(addr string) string
- func (s *Store) Query(qr *QueryRequest) ([]*sql.Rows, error)
- func (s *Store) RegisterObserver(o *raft.Observer)
- func (s *Store) Remove(addr string) error
- func (s *Store) Restore(rc io.ReadCloser) error
- func (s *Store) Snapshot() (raft.FSMSnapshot, error)
- func (s *Store) State() ClusterState
- func (s *Store) Stats() (map[string]interface{}, error)
- func (s *Store) UpdateAPIPeers(peers map[string]string) error
- func (s *Store) WaitForAppliedIndex(idx uint64, timeout time.Duration) error
- func (s *Store) WaitForLeader(timeout time.Duration) (string, error)
- type StoreConfig
- type Transport
Constants ¶
This section is empty.
Variables ¶
var ( // ErrNotLeader is returned when a node attempts to execute a leader-only // operation. ErrNotLeader = errors.New("not leader") // ErrOpenTimeout is returned when the Store does not apply its initial // logs within the specified time. ErrOpenTimeout = errors.New("timeout waiting for initial logs application") // ErrInvalidBackupFormat is returned when the requested backup format // is not valid. ErrInvalidBackupFormat = errors.New("invalid backup format") )
Functions ¶
func JoinAllowed ¶
JoinAllowed returns whether the config files within raftDir indicate that the node can join a cluster.
Types ¶
type BackupFormat ¶
type BackupFormat int
BackupFormat represents the format of database backup.
const ( // BackupSQL is the plaintext SQL command format. BackupSQL BackupFormat = iota // BackupBinary is a SQLite file backup format. BackupBinary )
type ClusterState ¶
type ClusterState int
ClusterState defines the possible Raft states the current node can be in
const ( Leader ClusterState = iota Follower Candidate Shutdown Unknown )
Represents the Raft cluster states
type ConsistencyLevel ¶
type ConsistencyLevel int
ConsistencyLevel represents the available read consistency levels.
const ( None ConsistencyLevel = iota Weak Strong )
Represents the available consistency levels.
type DBConfig ¶
type DBConfig struct { DSN string // Any custom DSN Memory bool // Whether the database is in-memory only. }
DBConfig represents the configuration of the underlying SQLite database.
func NewDBConfig ¶
NewDBConfig returns a new DB config instance.
type ExecuteRequest ¶
ExecuteRequest represents a query that returns now rows, but does modify the database.
type QueryRequest ¶
type QueryRequest struct { Queries []string Timings bool Tx bool Lvl ConsistencyLevel }
QueryRequest represents a query that returns rows, and does not modify the database.
type Store ¶
type Store struct { ShutdownOnRemove bool SnapshotThreshold uint64 SnapshotInterval time.Duration HeartbeatTimeout time.Duration ElectionTimeout time.Duration ApplyTimeout time.Duration OpenTimeout time.Duration // contains filtered or unexported fields }
Store is a SQLite database, where all changes are made via Raft consensus.
func (*Store) Backup ¶
func (s *Store) Backup(leader bool, fmt BackupFormat) ([]byte, error)
Backup return a snapshot of the underlying database.
If leader is true, this operation is performed with a read consistency level equivalent to "weak". Otherwise no guarantees are made about the read consistency level.
func (*Store) Database ¶
Database returns a copy of the underlying database. The caller should ensure that no transaction is taking place during this call, or an error may be returned. If leader is true, this operation is performed with a read consistency level equivalent to "weak". Otherwise no guarantees are made about the read consistency level.
http://sqlite.org/howtocorrupt.html states it is safe to do this as long as no transaction is in progress.
func (*Store) DeregisterObserver ¶
DeregisterObserver deregisters an observer of Raft events
func (*Store) Execute ¶
func (s *Store) Execute(ex *ExecuteRequest) ([]*sql.Result, error)
Execute executes queries that return no rows, but do modify the database.
func (*Store) ExecuteOrAbort ¶
func (s *Store) ExecuteOrAbort(ex *ExecuteRequest) (results []*sql.Result, retErr error)
ExecuteOrAbort executes the requests, but aborts any active transaction on the underlying database in the case of any error.
func (*Store) Join ¶
Join joins a node, located at addr, to this store. The node must be ready to respond to Raft communications at that address.
func (*Store) JoinRequired ¶
JoinRequired returns whether the node needs to join a cluster after being opened.
func (*Store) Leader ¶
Leader returns the current leader. Returns a blank string if there is no leader.
func (*Store) Open ¶
Open opens the store. If enableSingle is set, and there are no existing peers, then this node becomes the first node, and therefore leader, of the cluster.
func (*Store) Peer ¶
Peer returns the API address for the given addr. If there is no peer for the address, it returns the empty string.
func (*Store) Query ¶
func (s *Store) Query(qr *QueryRequest) ([]*sql.Rows, error)
Query executes queries that return rows, and do not modify the database.
func (*Store) RegisterObserver ¶
RegisterObserver registers an observer of Raft events
func (*Store) Restore ¶
func (s *Store) Restore(rc io.ReadCloser) error
Restore restores the node to a previous state.
func (*Store) Snapshot ¶
func (s *Store) Snapshot() (raft.FSMSnapshot, error)
Snapshot returns a snapshot of the database. The caller must ensure that no transaction is taking place during this call. Hashicorp Raft guarantees that this function will not be called concurrently with Apply.
http://sqlite.org/howtocorrupt.html states it is safe to do this as long as no transaction is in progress.
func (*Store) State ¶
func (s *Store) State() ClusterState
State returns the current node's Raft state
func (*Store) UpdateAPIPeers ¶
UpdateAPIPeers updates the cluster-wide peer information.
func (*Store) WaitForAppliedIndex ¶
WaitForAppliedIndex blocks until a given log index has been applied, or the timeout expires.
type StoreConfig ¶
type StoreConfig struct { DBConf *DBConfig // The DBConfig object for this Store. Dir string // The working directory for raft. Tn Transport // The underlying Transport for raft. Logger *log.Logger // The logger to use to log stuff. PeerStore raft.PeerStore // The PeerStore to use for raft. }
StoreConfig represents the configuration of the underlying Store.