transaction

Documentation

Index

• Variables
• type Item
• type Pool
  • func NewPool() *Pool
  • func (p *Pool) Get(extHash common.Hash) *ValidTransaction
  • func (p *Pool) Insert(tx *ValidTransaction) common.Hash
  • func (p *Pool) Len() int
  • func (p *Pool) Remove(hash common.Hash)
  • func (p *Pool) Transactions() []*ValidTransaction
• type PriorityQueue
  • func NewPriorityQueue() *PriorityQueue
  • func (spq *PriorityQueue) Exists(extHash common.Hash) bool
  • func (spq *PriorityQueue) Len() int
  • func (spq *PriorityQueue) Peek() *ValidTransaction
  • func (spq *PriorityQueue) Pending() []*ValidTransaction
  • func (spq *PriorityQueue) Pop() *ValidTransaction
  • func (spq *PriorityQueue) PopWithTimer(timerCh <-chan time.Time) (transaction *ValidTransaction)
  • func (spq *PriorityQueue) Push(txn *ValidTransaction) (common.Hash, error)
  • func (spq *PriorityQueue) RemoveExtrinsic(ext types.Extrinsic)
• type Status
  • func (s Status) String() string
• type ValidTransaction
  • func NewValidTransaction(extrinsic types.Extrinsic, validity *Validity) *ValidTransaction
• type Validity
  • func NewValidity(priority uint64, requires, provides [][]byte, longevity uint64, propagate bool) *Validity

Variables

var ErrTransactionExists = errors.New("transaction is already in queue")

ErrTransactionExists is returned when trying to add a transaction to the queue that already exists

Types

type Item

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

An Item is something we manage in a priority queue.

type Pool

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

Pool represents the transaction pool

func NewPool

func NewPool() *Pool

NewPool returns a new empty Pool

func (*Pool) Get

func (p *Pool) Get(extHash common.Hash) *ValidTransaction

Get returns a pointer to ValidTransaction or nil given an extinsic hash

func (*Pool) Insert

func (p *Pool) Insert(tx *ValidTransaction) common.Hash

Insert inserts a transaction into the pool

func (*Pool) Len

func (p *Pool) Len() int

Len return the current length of the pool

func (*Pool) Remove

func (p *Pool) Remove(hash common.Hash)

Remove removes a transaction from the pool

func (*Pool) Transactions

func (p *Pool) Transactions() []*ValidTransaction

Transactions returns all the transactions in the pool

type PriorityQueue

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

PriorityQueue is a thread safe wrapper over `priorityQueue`

func NewPriorityQueue

func NewPriorityQueue() *PriorityQueue

NewPriorityQueue creates new instance of PriorityQueue

func (*PriorityQueue) Exists

func (spq *PriorityQueue) Exists(extHash common.Hash) bool

Exists returns true if a hash is in the txs map, false otherwise

func (*PriorityQueue) Len

func (spq *PriorityQueue) Len() int

Len return the current length of the queue

func (*PriorityQueue) Peek

func (spq *PriorityQueue) Peek() *ValidTransaction

Peek returns the next item without removing it from the queue

func (*PriorityQueue) Pending

func (spq *PriorityQueue) Pending() []*ValidTransaction

Pending returns all the transactions currently in the queue

func (*PriorityQueue) Pop

func (spq *PriorityQueue) Pop() *ValidTransaction

Pop removes the transaction with has the highest priority value from the queue and returns it. If there are multiple transaction with same priority value then it return them in FIFO order.

func (*PriorityQueue) PopWithTimer

func (spq *PriorityQueue) PopWithTimer(timerCh <-chan time.Time) (transaction *ValidTransaction)

PopWithTimer returns the next valid transaction from the queue. When the timer expires, it returns `nil`.

func (*PriorityQueue) Push

func (spq *PriorityQueue) Push(txn *ValidTransaction) (common.Hash, error)

Push inserts a valid transaction with priority p into the queue

func (*PriorityQueue) RemoveExtrinsic

func (spq *PriorityQueue) RemoveExtrinsic(ext types.Extrinsic)

RemoveExtrinsic removes an extrinsic from the queue

type Status

type Status int64

Status represents possible transaction statuses.

The status events can be grouped based on their kinds as: 1. Entering/Moving within the pool:

• `Future`
• `Ready`

2. Inside `Ready` queue:

• `Broadcast`

3. Leaving the pool:

• `InBlock`
• `Invalid`
• `Usurped`
• `Dropped` 4. Re-entering the pool:
• `Retracted` 5. Block finalized:
• `Finalized`
• `FinalityTimeout`

const (
	// Future status occurs when transaction is part of the future queue.
	Future Status = iota
	// Ready status occurs when transaction is part of the ready queue.
	Ready
	// Broadcast status occurs when transaction has been broadcast to the given peers.
	Broadcast
	// InBlock status occurs when transaction has been included in block with given
	// hash.
	InBlock
	// Retracted status occurs when the block this transaction was included in has
	// been retracted.
	Retracted
	// FinalityTimeout status occurs when the maximum number of finality watchers
	// has been reached,
	// old watchers are being removed.
	FinalityTimeout
	// Finalized status occurs when transaction has been finalized by a finality-gadget,
	// e.g GRANDPA
	Finalized
	// Usurped status occurs when transaction has been replaced in the pool, by another
	// transaction that provides the same tags. (e.g. same (sender, nonce)).
	Usurped
	// Dropped status occurs when transaction has been dropped from the pool because
	// of the limit.
	Dropped
	// Invalid status occurs when transaction is no longer valid in the current state.
	Invalid
)

func (Status) String

func (s Status) String() string

String returns string representation of current status.

type ValidTransaction

type ValidTransaction struct {
	Extrinsic types.Extrinsic
	Validity  *Validity
}

ValidTransaction struct

func NewValidTransaction

func NewValidTransaction(extrinsic types.Extrinsic, validity *Validity) *ValidTransaction

NewValidTransaction returns ValidTransaction

type Validity

type Validity struct {
	Priority  uint64
	Requires  [][]byte
	Provides  [][]byte
	Longevity uint64
	Propagate bool
}

Validity struct see https://github.com/paritytech/substrate/blob/5420de3face1349a97eb954ae71c5b0b940c31de/core/sr-primitives/src/transaction_validity.rs#L178

func NewValidity

func NewValidity(priority uint64, requires, provides [][]byte, longevity uint64, propagate bool) *Validity

NewValidity returns Validity