session

Documentation

Index

• Constants
• Variables
• func MaxClusterTime(ct1, ct2 bson.Raw) bson.Raw
• type Client
  • func NewClientSession(pool *Pool, clientID uuid.UUID, sessionType Type, opts ...*ClientOptions) (*Client, error)
  • func (c *Client) AbortTransaction() error
  • func (c *Client) AdvanceClusterTime(clusterTime bson.Raw) error
  • func (c *Client) AdvanceOperationTime(opTime *primitive.Timestamp) error
  • func (c *Client) ApplyCommand()
  • func (c *Client) CheckAbortTransaction() error
  • func (c *Client) CheckCommitTransaction() error
  • func (c *Client) CheckStartTransaction() error
  • func (c *Client) CommitTransaction() error
  • func (c *Client) EndSession()
  • func (c *Client) StartTransaction(opts *TransactionOptions) error
  • func (c *Client) TransactionCommitted() bool
  • func (c *Client) TransactionInProgress() bool
  • func (c *Client) TransactionRunning() bool
  • func (c *Client) TransactionStarting() bool
  • func (c *Client) UpdateUseTime() error
• type ClientOptions
• type ClusterClock
  • func (cc *ClusterClock) AdvanceClusterTime(clusterTime bson.Raw)
  • func (cc *ClusterClock) GetClusterTime() bson.Raw
• type Node
• type Pool
  • func NewPool(descChan <-chan description.Topology) *Pool
  • func (p *Pool) CheckedOut() int
  • func (p *Pool) GetSession() (*Server, error)
  • func (p *Pool) IDSlice() []bsonx.Doc
  • func (p *Pool) ReturnSession(ss *Server)
  • func (p *Pool) String() string
• type Server
  • func (ss *Server) IncrementTxnNumber()
• type TransactionOptions
• type Type

Constants

const (
	None state = iota
	Starting
	InProgress
	Committed
	Aborted
)

Client Session states

const UUIDSubtype byte = 4

UUIDSubtype is the BSON binary subtype that a UUID should be encoded as

Variables

var ErrAbortAfterCommit = errors.New("cannot call abortTransaction after calling commitTransaction")

ErrAbortAfterCommit is returned when abort is called after a commit.

var ErrAbortTwice = errors.New("cannot call abortTransaction twice")

ErrAbortTwice is returned if abort is called after transaction is already aborted.

var ErrCommitAfterAbort = errors.New("cannot call commitTransaction after calling abortTransaction")

ErrCommitAfterAbort is returned if commit is called after an abort.

var ErrNoTransactStarted = errors.New("no transaction started")

ErrNoTransactStarted is returned if a transaction operation is called when no transaction has started.

var ErrSessionEnded = errors.New("ended session was used")

ErrSessionEnded is returned when a client session is used after a call to endSession().

var ErrTransactInProgress = errors.New("transaction already in progress")

ErrTransactInProgress is returned if startTransaction() is called when a transaction is in progress.

var ErrUnackWCUnsupported = errors.New("transactions do not support unacknowledged write concerns")

ErrUnackWCUnsupported is returned if an unacknowledged write concern is supported for a transaciton.

Functions

func MaxClusterTime

func MaxClusterTime(ct1, ct2 bson.Raw) bson.Raw

MaxClusterTime compares 2 clusterTime documents and returns the document representing the highest cluster time.

Types

type Client

type Client struct {
	*Server
	ClientID       uuid.UUID
	ClusterTime    bson.Raw
	Consistent     bool // causal consistency
	OperationTime  *primitive.Timestamp
	SessionType    Type
	Terminated     bool
	RetryingCommit bool
	Committing     bool
	Aborting       bool
	RetryWrite     bool

	// options for the current transaction
	// most recently set by transactionopt
	CurrentRc *readconcern.ReadConcern
	CurrentRp *readpref.ReadPref
	CurrentWc *writeconcern.WriteConcern
	// contains filtered or unexported fields
}

Client is a session for clients to run commands.

func NewClientSession

func NewClientSession(pool *Pool, clientID uuid.UUID, sessionType Type, opts ...*ClientOptions) (*Client, error)

NewClientSession creates a Client.

func (*Client) AbortTransaction

func (c *Client) AbortTransaction() error

AbortTransaction updates the state for a successfully committed transaction and returns an error if not permissible. It does not actually perform the abort.

func (*Client) AdvanceClusterTime

func (c *Client) AdvanceClusterTime(clusterTime bson.Raw) error

AdvanceClusterTime updates the session's cluster time.

func (*Client) AdvanceOperationTime

func (c *Client) AdvanceOperationTime(opTime *primitive.Timestamp) error

AdvanceOperationTime updates the session's operation time.

func (*Client) ApplyCommand

func (c *Client) ApplyCommand()

ApplyCommand advances the state machine upon command execution.

func (*Client) CheckAbortTransaction

func (c *Client) CheckAbortTransaction() error

CheckAbortTransaction checks to see if allowed to abort transaction and returns an error if not allowed.

func (*Client) CheckCommitTransaction

func (c *Client) CheckCommitTransaction() error

CheckCommitTransaction checks to see if allowed to commit transaction and returns an error if not allowed.

func (*Client) CheckStartTransaction

func (c *Client) CheckStartTransaction() error

CheckStartTransaction checks to see if allowed to start transaction and returns an error if not allowed

func (*Client) CommitTransaction

func (c *Client) CommitTransaction() error

CommitTransaction updates the state for a successfully committed transaction and returns an error if not permissible. It does not actually perform the commit.

func (*Client) EndSession

func (c *Client) EndSession()

EndSession ends the session.

func (*Client) StartTransaction

func (c *Client) StartTransaction(opts *TransactionOptions) error

StartTransaction initializes the transaction options and advances the state machine. It does not contact the server to start the transaction.

func (*Client) TransactionCommitted

func (c *Client) TransactionCommitted() bool

TransactionCommitted returns true of the client session just committed a transaciton.

func (*Client) TransactionInProgress

func (c *Client) TransactionInProgress() bool

TransactionInProgress returns true if the client session is in an active transaction.

func (*Client) TransactionRunning

func (c *Client) TransactionRunning() bool

TransactionRunning returns true if the client session has started the transaction and it hasn't been committed or aborted

func (*Client) TransactionStarting

func (c *Client) TransactionStarting() bool

TransactionStarting returns true if the client session is starting a transaction.

func (*Client) UpdateUseTime

func (c *Client) UpdateUseTime() error

UpdateUseTime updates the session's last used time. Must be called whenver this session is used to send a command to the server.

type ClientOptions

type ClientOptions struct {
	CausalConsistency     *bool
	DefaultReadConcern    *readconcern.ReadConcern
	DefaultWriteConcern   *writeconcern.WriteConcern
	DefaultReadPreference *readpref.ReadPref
}

ClientOptions represents all possible options for creating a client session.

type ClusterClock

type ClusterClock struct {
	// contains filtered or unexported fields
}

ClusterClock represents a logical clock for keeping track of cluster time.

func (*ClusterClock) AdvanceClusterTime

func (cc *ClusterClock) AdvanceClusterTime(clusterTime bson.Raw)

AdvanceClusterTime updates the cluster's current time.

func (*ClusterClock) GetClusterTime

func (cc *ClusterClock) GetClusterTime() bson.Raw

GetClusterTime returns the cluster's current time.

type Node

type Node struct {
	*Server
	// contains filtered or unexported fields
}

Node represents a server session in a linked list

type Pool

type Pool struct {
	// contains filtered or unexported fields
}

Pool is a pool of server sessions that can be reused.

func NewPool

func NewPool(descChan <-chan description.Topology) *Pool

NewPool creates a new server session pool

func (*Pool) CheckedOut

func (p *Pool) CheckedOut() int

CheckedOut returns number of sessions checked out from pool.

func (*Pool) GetSession

func (p *Pool) GetSession() (*Server, error)

GetSession retrieves an unexpired session from the pool.

func (*Pool) IDSlice

func (p *Pool) IDSlice() []bsonx.Doc

IDSlice returns a slice of session IDs for each session in the pool

func (*Pool) ReturnSession

func (p *Pool) ReturnSession(ss *Server)

ReturnSession returns a session to the pool if it has not expired.

func (*Pool) String

func (p *Pool) String() string

String implements the Stringer interface

type Server

type Server struct {
	SessionID bsonx.Doc
	TxnNumber int64
	LastUsed  time.Time
}

Server is an open session with the server.

func (*Server) IncrementTxnNumber

func (ss *Server) IncrementTxnNumber()

IncrementTxnNumber increments the transaction number.

type TransactionOptions

type TransactionOptions struct {
	ReadConcern    *readconcern.ReadConcern
	WriteConcern   *writeconcern.WriteConcern
	ReadPreference *readpref.ReadPref
}

TransactionOptions represents all possible options for starting a transaction in a session.

type Type

type Type uint8

Type describes the type of the session

const (
	Explicit Type = iota
	Implicit
)

These constants are the valid types for a client session.