Documentation

Index

Constants

const (
	GasIterNextCostFlatDesc = "IterNextFlat"
	GasValuePerByteDesc     = "ValuePerByte"
	GasWritePerByteDesc     = "WritePerByte"
	GasReadPerByteDesc      = "ReadPerByte"
	GasWriteCostFlatDesc    = "WriteFlat"
	GasReadCostFlatDesc     = "ReadFlat"
	GasHasDesc              = "Has"
	GasDeleteDesc           = "Delete"
)

Gas consumption descriptors.


Variables

var (
	// PruneEverything means all saved states will be deleted, storing only the current state
	PruneEverything = NewPruningOptions(0, 0)
	// PruneNothing means all historic states will be saved, nothing will be deleted
	PruneNothing = NewPruningOptions(0, 1)
	// PruneSyncable means only those states not needed for state syncing will be deleted (keeps last 100 + every 10000th)
	PruneSyncable = NewPruningOptions(100, 10000)
)

default pruning strategies


Functions

func AssertValidKey

func AssertValidKey(key []byte)

Check if the key is valid(key is not nil)

func AssertValidValue

func AssertValidValue(value []byte)

Check if the value is valid(value is not nil)

func Cp

func Cp(bz []byte) (ret []byte)

----------------------------------------

func DiffKVStores

func DiffKVStores(a KVStore, b KVStore, prefixesToSkip [][]byte) (kvA cmn.KVPair, kvB cmn.KVPair, count int64, equal bool)

Compare two KVstores, return either the first key/value pair at which they differ and whether or not they are equal, skipping value comparison for a set of provided prefixes

func InclusiveEndBytes

func InclusiveEndBytes(inclusiveBytes []byte) (exclusiveBytes []byte)

InclusiveEndBytes returns the []byte that would end a range query such that the input would be included

func PrefixEndBytes

func PrefixEndBytes(prefix []byte) []byte

PrefixEndBytes returns the []byte that would end a range query for all []byte with a certain prefix Deals with last byte of prefix being FF without overflowing

Types

type CacheKVStore

type CacheKVStore interface {
	KVStore

	// Writes operations to underlying KVStore
	Write()
}

CacheKVStore cache-wraps a KVStore. After calling .Write() on the CacheKVStore, all previously created CacheKVStores on the object expire.

type CacheMultiStore

type CacheMultiStore interface {
	MultiStore
	Write() // Writes operations to underlying KVStore
}

From MultiStore.CacheMultiStore()....

type CacheWrap

type CacheWrap interface {
	// Write syncs with the underlying store.
	Write()

	// CacheWrap recursively wraps again.
	CacheWrap() CacheWrap

	// CacheWrapWithTrace recursively wraps again with tracing enabled.
	CacheWrapWithTrace(w io.Writer, tc TraceContext) CacheWrap
}

CacheWrap makes the most appropriate cache-wrap. For example, IAVLStore.CacheWrap() returns a CacheKVStore. CacheWrap should not return a Committer, since Commit cache-wraps make no sense. It can return KVStore, HeapStore, SpaceStore, etc.

type CacheWrapper

type CacheWrapper interface {
	// CacheWrap cache wraps.
	CacheWrap() CacheWrap

	// CacheWrapWithTrace cache wraps with tracing enabled.
	CacheWrapWithTrace(w io.Writer, tc TraceContext) CacheWrap
}

type CommitID

type CommitID struct {
	Version int64
	Hash    []byte
}

CommitID contains the tree version number and its merkle root.

func (CommitID) IsZero

func (cid CommitID) IsZero() bool

func (CommitID) String

func (cid CommitID) String() string

type CommitKVStore

type CommitKVStore interface {
	Committer
	KVStore
}

Stores of MultiStore must implement CommitStore.

type CommitMultiStore

type CommitMultiStore interface {
	Committer
	MultiStore

	// Mount a store of type using the given db.
	// If db == nil, the new store will use the CommitMultiStore db.
	MountStoreWithDB(key StoreKey, typ StoreType, db dbm.DB)

	// Panics on a nil key.
	GetCommitStore(key StoreKey) CommitStore

	// Panics on a nil key.
	GetCommitKVStore(key StoreKey) CommitKVStore

	// Load the latest persisted version.  Called once after all
	// calls to Mount*Store() are complete.
	LoadLatestVersion() error

	// Load a specific persisted version.  When you load an old
	// version, or when the last commit attempt didn't complete,
	// the next commit after loading must be idempotent (return the
	// same commit id).  Otherwise the behavior is undefined.
	LoadVersion(ver int64) error
}

A non-cache MultiStore.

type CommitStore

type CommitStore interface {
	Committer
	Store
}

Stores of MultiStore must implement CommitStore.

type Committer

type Committer interface {
	Commit() CommitID
	LastCommitID() CommitID
	SetPruning(PruningOptions)
}

something that can persist to disk

type ErrorGasOverflow

type ErrorGasOverflow struct {
	Descriptor string
}

ErrorGasOverflow defines an error thrown when an action results gas consumption unsigned integer overflow.

type ErrorOutOfGas

type ErrorOutOfGas struct {
	Descriptor string
}

ErrorOutOfGas defines an error thrown when an action results in out of gas.

type Gas

type Gas = uint64

Gas measured by the SDK

type GasConfig

type GasConfig struct {
	HasCost          Gas
	DeleteCost       Gas
	ReadCostFlat     Gas
	ReadCostPerByte  Gas
	WriteCostFlat    Gas
	WriteCostPerByte Gas
	IterNextCostFlat Gas
}

GasConfig defines gas cost for each operation on KVStores

func KVGasConfig

func KVGasConfig() GasConfig

KVGasConfig returns a default gas config for KVStores.

func TransientGasConfig

func TransientGasConfig() GasConfig

TransientGasConfig returns a default gas config for TransientStores.

type GasMeter

type GasMeter interface {
	GasConsumed() Gas
	GasConsumedToLimit() Gas
	Limit() Gas
	ConsumeGas(amount Gas, descriptor string)
	IsPastLimit() bool
	IsOutOfGas() bool
}

GasMeter interface to track gas consumption

func NewGasMeter

func NewGasMeter(limit Gas) GasMeter

NewGasMeter returns a reference to a new basicGasMeter.

func NewInfiniteGasMeter

func NewInfiniteGasMeter() GasMeter

NewInfiniteGasMeter returns a reference to a new infiniteGasMeter.

type Iterator

type Iterator = dbm.Iterator

Alias iterator to db's Iterator for convenience.

func KVStorePrefixIterator

func KVStorePrefixIterator(kvs KVStore, prefix []byte) Iterator

Iterator over all the keys with a certain prefix in ascending order

func KVStoreReversePrefixIterator

func KVStoreReversePrefixIterator(kvs KVStore, prefix []byte) Iterator

Iterator over all the keys with a certain prefix in descending order.

type KVPair

type KVPair cmn.KVPair

key-value result for iterator queries

type KVStore

type KVStore interface {
	Store

	// Get returns nil iff key doesn't exist. Panics on nil key.
	Get(key []byte) []byte

	// Has checks if a key exists. Panics on nil key.
	Has(key []byte) bool

	// Set sets the key. Panics on nil key or value.
	Set(key, value []byte)

	// Delete deletes the key. Panics on nil key.
	Delete(key []byte)

	// Iterator over a domain of keys in ascending order. End is exclusive.
	// Start must be less than end, or the Iterator is invalid.
	// Iterator must be closed by caller.
	// To iterate over entire domain, use store.Iterator(nil, nil)
	// CONTRACT: No writes may happen within a domain while an iterator exists over it.
	// Exceptionally allowed for cachekv.Store, safe to write in the modules.
	Iterator(start, end []byte) Iterator

	// Iterator over a domain of keys in descending order. End is exclusive.
	// Start must be less than end, or the Iterator is invalid.
	// Iterator must be closed by caller.
	// CONTRACT: No writes may happen within a domain while an iterator exists over it.
	// Exceptionally allowed for cachekv.Store, safe to write in the modules.
	ReverseIterator(start, end []byte) Iterator
}

KVStore is a simple interface to get/set data

type KVStoreKey

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

KVStoreKey is used for accessing substores. Only the pointer value should ever be used - it functions as a capabilities key.

func NewKVStoreKey

func NewKVStoreKey(name string) *KVStoreKey

NewKVStoreKey returns a new pointer to a KVStoreKey. Use a pointer so keys don't collide.

func (*KVStoreKey) Name

func (key *KVStoreKey) Name() string

func (*KVStoreKey) String

func (key *KVStoreKey) String() string

type MultiStore

type MultiStore interface {
	Store

	// Cache wrap MultiStore.
	// NOTE: Caller should probably not call .Write() on each, but
	// call CacheMultiStore.Write().
	CacheMultiStore() CacheMultiStore

	// Convenience for fetching substores.
	// If the store does not exist, panics.
	GetStore(StoreKey) Store
	GetKVStore(StoreKey) KVStore

	// TracingEnabled returns if tracing is enabled for the MultiStore.
	TracingEnabled() bool

	// SetTracer sets the tracer for the MultiStore that the underlying
	// stores will utilize to trace operations. The modified MultiStore is
	// returned.
	SetTracer(w io.Writer) MultiStore

	// SetTracingContext sets the tracing context for a MultiStore. It is
	// implied that the caller should update the context when necessary between
	// tracing operations. The modified MultiStore is returned.
	SetTracingContext(TraceContext) MultiStore
}

type PruningOptions

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

PruningStrategy specifies how old states will be deleted over time where keepRecent can be used with keepEvery to create a pruning "strategy".

func NewPruningOptions

func NewPruningOptions(keepRecent, keepEvery int64) PruningOptions

func (PruningOptions) KeepEvery

func (po PruningOptions) KeepEvery() int64

Keeps every N stated, deleting others.

func (PruningOptions) KeepRecent

func (po PruningOptions) KeepRecent() int64

How much recent state will be kept. Older state will be deleted.

type Queryable

type Queryable interface {
	Query(abci.RequestQuery) abci.ResponseQuery
}

Queryable allows a Store to expose internal state to the abci.Query interface. Multistore can route requests to the proper Store.

This is an optional, but useful extension to any CommitStore

type Store

type Store interface {
	GetStoreType() StoreType
	CacheWrapper
}

type StoreKey

type StoreKey interface {
	Name() string
	String() string
}

StoreKey is a key used to index stores in a MultiStore.

type StoreType

type StoreType int

kind of store

const (
	//nolint
	StoreTypeMulti StoreType = iota
	StoreTypeDB
	StoreTypeIAVL
	StoreTypeTransient
)

type TraceContext

type TraceContext map[string]interface{}

TraceContext contains TraceKVStore context data. It will be written with every trace operation.

type TransientStoreKey

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

TransientStoreKey is used for indexing transient stores in a MultiStore

func NewTransientStoreKey

func NewTransientStoreKey(name string) *TransientStoreKey

Constructs new TransientStoreKey Must return a pointer according to the ocap principle

func (*TransientStoreKey) Name

func (key *TransientStoreKey) Name() string

Implements StoreKey

func (*TransientStoreKey) String

func (key *TransientStoreKey) String() string

Implements StoreKey