iavl

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Published: Jun 17, 2022 License: Apache-2.0, Apache-2.0 Imports: 33 Imported by: 0

README

IAVL+ Tree

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Note: Requires Go 1.13+

A versioned, snapshottable (immutable) AVL+ tree for persistent data.

The purpose of this data structure is to provide persistent storage for key-value pairs (say to store account balances) such that a deterministic merkle root hash can be computed. The tree is balanced using a variant of the AVL algorithm so all operations are O(log(n)).

Nodes of this tree are immutable and indexed by their hash. Thus any node serves as an immutable snapshot which lets us stage uncommitted transactions from the mempool cheaply, and we can instantly roll back to the last committed state to process transactions of a newly committed block (which may not be the same set of transactions as those from the mempool).

In an AVL tree, the heights of the two child subtrees of any node differ by at most one. Whenever this condition is violated upon an update, the tree is rebalanced by creating O(log(n)) new nodes that point to unmodified nodes of the old tree. In the original AVL algorithm, inner nodes can also hold key-value pairs. The AVL+ algorithm (note the plus) modifies the AVL algorithm to keep all values on leaf nodes, while only using branch-nodes to store keys. This simplifies the algorithm while keeping the merkle hash trail short.

In Ethereum, the analog is Patricia tries. There are tradeoffs. Keys do not need to be hashed prior to insertion in IAVL+ trees, so this provides faster iteration in the key space which may benefit some applications. The logic is simpler to implement, requiring only two types of nodes -- inner nodes and leaf nodes. On the other hand, while IAVL+ trees provide a deterministic merkle root hash, it depends on the order of transactions. In practice this shouldn't be a problem, since you can efficiently encode the tree structure when serializing the tree contents.

Documentation

Overview

Package iavl implements a versioned, snapshottable (immutable) AVL+ tree for persisting key-value pairs.

The tree is not safe for concurrent use, and must be guarded by a Mutex or RWLock as appropriate - the exception is immutable trees returned by MutableTree.GetImmutable() which are safe for concurrent use as long as the version is not deleted via DeleteVersion().

Basic usage of MutableTree:

import "github.com/okex/exchain/libs/iavl"
import "github.com/okex/exchain/libs/tm-db"
...

tree := iavl.NewMutableTree(db.NewMemDB(), 128)

tree.IsEmpty() // true

tree.Set([]byte("alice"), []byte("abc"))
tree.SaveVersion(1)

tree.Set([]byte("alice"), []byte("xyz"))
tree.Set([]byte("bob"), []byte("xyz"))
tree.SaveVersion(2)

tree.LatestVersion() // 2

tree.GetVersioned([]byte("alice"), 1) // "abc"
tree.GetVersioned([]byte("alice"), 2) // "xyz"

Proof of existence:

root := tree.Hash()
val, proof, err := tree.GetVersionedWithProof([]byte("bob"), 2) // "xyz", RangeProof, nil
proof.Verify([]byte("bob"), val, root) // nil

Proof of absence:

_, proof, err = tree.GetVersionedWithProof([]byte("tom"), 2) // nil, RangeProof, nil
proof.Verify([]byte("tom"), nil, root) // nil

Now we delete an old version:

tree.DeleteVersion(1)
tree.VersionExists(1) // false
tree.Get([]byte("alice")) // "xyz"
tree.GetVersioned([]byte("alice"), 1) // nil

Can't create a proof of absence for a version we no longer have:

_, proof, err = tree.GetVersionedWithProof([]byte("tom"), 1) // nil, nil, error

Index

Examples

Constants

View Source
const (
	IavlErr   = 0
	IavlInfo  = 1
	IavlDebug = 2
)
View Source
const (
	FlagIavlCommitIntervalHeight   = "iavl-commit-interval-height"
	FlagIavlMinCommitItemCount     = "iavl-min-commit-item-count"
	FlagIavlHeightOrphansCacheSize = "iavl-height-orphans-cache-size"
	FlagIavlMaxCommittedHeightNum  = "iavl-max-committed-height-num"
	FlagIavlEnableAsyncCommit      = "iavl-enable-async-commit"
)
View Source
const (
	PreloadConcurrencyThreshold = 4

	PreChangeOpSet    byte = 1
	PreChangeOpDelete byte = 0
	PreChangeNop      byte = 0xFF
)
View Source
const (
	ANSIReset  = "\x1b[0m"
	ANSIBright = "\x1b[1m"

	ANSIFgGreen = "\x1b[32m"
	ANSIFgBlue  = "\x1b[34m"
	ANSIFgCyan  = "\x1b[36m"
)
View Source
const (
	FlagIavlCacheInitRatio = "iavl-cache-init-ratio"
)
View Source
const (
	FlagOutputModules = "iavl-output-modules"
)
View Source
const ProofOpIAVLAbsence = "iavl:a"
View Source
const ProofOpIAVLValue = "iavl:v"

Variables

View Source
var (
	// ErrVersionDoesNotExist is returned if a requested version does not exist.
	ErrVersionDoesNotExist = errors.New("version does not exist")

	// Parameters below here are changed from cosmos-sdk, controlled by flag
	CommitIntervalHeight      int64 = 100
	MinCommitItemCount        int64 = 500000
	HeightOrphansCacheSize          = 8
	MaxCommittedHeightNum           = minHistoryStateNum
	EnableAsyncCommit               = false
	EnablePruningHistoryState       = true
	CommitGapHeight           int64 = 100
)
View Source
var (
	// ErrInvalidProof is returned by Verify when a proof cannot be validated.
	ErrInvalidProof = fmt.Errorf("invalid proof")

	// ErrInvalidInputs is returned when the inputs passed to the function are invalid.
	ErrInvalidInputs = fmt.Errorf("invalid inputs")

	// ErrInvalidRoot is returned when the root passed in does not match the proof's.
	ErrInvalidRoot = fmt.Errorf("invalid root")
)
View Source
var (
	Version = ""
	Commit  = ""
	Branch  = ""
)

Version of iavl. Fill in fields with build flags

View Source
var ErrNoImport = errors.New("no import in progress")

ErrNoImport is returned when calling methods on a closed importer

View Source
var ExportDone = errors.New("export is complete") // nolint:golint

ExportDone is returned by Exporter.Next() when all items have been exported.

View Source
var (
	IavlCacheInitRatio float64 = 0
)
View Source
var (
	OutputModules map[string]int
)

Functions

func AbsenceOpDecoder

func AbsenceOpDecoder(pop merkle.ProofOp) (merkle.ProofOperator, error)

func Blue

func Blue(args ...interface{}) string

func ColoredBytes

func ColoredBytes(data []byte, textColor, bytesColor func(...interface{}) string) string

ColoredBytes takes in the byte that you would like to show as a string and byte and will display them in a human readable format. If the environment variable TENDERMINT_IAVL_COLORS_ON is set to a non-empty string then different colors will be used for bytes and strings.

func Cyan

func Cyan(args ...interface{}) string

func GetIgnoreVersionCheck added in v1.0.0

func GetIgnoreVersionCheck() bool

func Green

func Green(args ...interface{}) string

func ParseDBName

func ParseDBName(db dbm.DB) string

func PrintTree

func PrintTree(tree *ImmutableTree)

PrintTree prints the whole tree in an indented form.

func RegisterWire

func RegisterWire(cdc *amino.Codec)

func Repair013Orphans

func Repair013Orphans(db dbm.DB) (uint64, error)

Repair013Orphans repairs incorrect orphan entries written by IAVL 0.13 pruning. To use it, close a database using IAVL 0.13, make a backup copy, and then run this function before opening the database with IAVL 0.14 or later. It returns the number of faulty orphan entries removed. If the 0.13 database was written with KeepEvery:1 (the default) or the last version _ever_ saved to the tree was a multiple of `KeepEvery` and thus saved to disk, this repair is not necessary.

Note that this cannot be used directly on Cosmos SDK databases, since they store multiple IAVL trees in the same underlying database via a prefix scheme.

The pruning functionality enabled with Options.KeepEvery > 1 would write orphans entries to disk for versions that should only have been saved in memory, and these orphan entries were clamped to the last version persisted to disk instead of the version that generated them (so a delete at version 749 might generate an orphan entry ending at version 700 for KeepEvery:100). If the database is reopened at the last persisted version and this version is later deleted, the orphaned nodes can be deleted prematurely or incorrectly, causing data loss and database corruption.

This function removes these incorrect orphan entries by deleting all orphan entries that have a to-version equal to or greater than the latest persisted version. Correct orphans will never have this, since they must have been deleted in a future (non-existent) version for that to be the case.

func SetIgnoreVersionCheck

func SetIgnoreVersionCheck(check bool)

func SetLogFunc

func SetLogFunc(l LogFuncType)

func SetLogger added in v1.2.0

func SetLogger(l logger)

func SetProduceDelta added in v1.0.0

func SetProduceDelta(pd bool)

func ValueOpDecoder

func ValueOpDecoder(pop merkle.ProofOp) (merkle.ProofOperator, error)

func WriteDOTGraph

func WriteDOTGraph(w io.Writer, tree *ImmutableTree, paths []PathToLeaf)

Types

type AbsenceOp

type AbsenceOp struct {

	// To encode in ProofOp.Data.
	// Proof is nil for an empty tree.
	// The hash of an empty tree is nil.
	Proof *RangeProof `json:"proof"`
	// contains filtered or unexported fields
}

IAVLAbsenceOp takes a key as its only argument

If the produced root hash matches the expected hash, the proof is good.

func NewAbsenceOp

func NewAbsenceOp(key []byte, proof *RangeProof) AbsenceOp

func (AbsenceOp) GetKey

func (op AbsenceOp) GetKey() []byte

func (AbsenceOp) ProofOp

func (op AbsenceOp) ProofOp() merkle.ProofOp

func (AbsenceOp) Run

func (op AbsenceOp) Run(args [][]byte) ([][]byte, error)

func (AbsenceOp) String

func (op AbsenceOp) String() string

type CommitOrphansImp added in v1.1.6

type CommitOrphansImp struct {
	Key         string
	CommitValue int64
}

func (*CommitOrphansImp) MarshalToAmino added in v1.1.6

func (ci *CommitOrphansImp) MarshalToAmino(cdc *amino.Codec) ([]byte, error)

MarshalToAmino marshal data to amino bytes.

func (*CommitOrphansImp) UnmarshalFromAmino added in v1.1.6

func (ci *CommitOrphansImp) UnmarshalFromAmino(cdc *amino.Codec, data []byte) error

UnmarshalFromAmino unmarshal data from animo bytes.

type ExportNode

type ExportNode struct {
	Key     []byte
	Value   []byte
	Version int64
	Height  int8
}

ExportNode contains exported node data.

type Exporter

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

Exporter exports nodes from an ImmutableTree. It is created by ImmutableTree.Export().

Exported nodes can be imported into an empty tree with MutableTree.Import(). Nodes are exported depth-first post-order (LRN), this order must be preserved when importing in order to recreate the same tree structure.

func (*Exporter) Close

func (e *Exporter) Close()

Close closes the exporter. It is safe to call multiple times.

func (*Exporter) Next

func (e *Exporter) Next() (*ExportNode, error)

Next fetches the next exported node, or returns ExportDone when done.

type ImmutableTree

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

ImmutableTree contains the immutable tree at a given version. It is typically created by calling MutableTree.GetImmutable(), in which case the returned tree is safe for concurrent access as long as the version is not deleted via DeleteVersion() or the tree's pruning settings.

Returned key/value byte slices must not be modified, since they may point to data located inside IAVL which would also be modified.

func NewImmutableTree

func NewImmutableTree(db dbm.DB, cacheSize int) *ImmutableTree

NewImmutableTree creates both in-memory and persistent instances

func NewImmutableTreeWithOpts

func NewImmutableTreeWithOpts(db dbm.DB, cacheSize int, opts *Options) *ImmutableTree

NewImmutableTreeWithOpts creates an ImmutableTree with the given options.

func (*ImmutableTree) Export

func (t *ImmutableTree) Export() *Exporter

Export returns an iterator that exports tree nodes as ExportNodes. These nodes can be imported with MutableTree.Import() to recreate an identical tree.

func (*ImmutableTree) Get

func (t *ImmutableTree) Get(key []byte) (index int64, value []byte)

Get returns the index and value of the specified key if it exists, or nil and the next index otherwise. The returned value must not be modified, since it may point to data stored within IAVL.

func (*ImmutableTree) GetByIndex

func (t *ImmutableTree) GetByIndex(index int64) (key []byte, value []byte)

GetByIndex gets the key and value at the specified index.

func (*ImmutableTree) GetMembershipProof added in v1.3.0

func (t *ImmutableTree) GetMembershipProof(key []byte) (*ics23.CommitmentProof, error)

func (*ImmutableTree) GetNonMembershipProof added in v1.3.0

func (t *ImmutableTree) GetNonMembershipProof(key []byte) (*ics23.CommitmentProof, error)

GetNonMembershipProof will produce a CommitmentProof that the given key doesn't exist in the iavl tree. If the key exists in the tree, this will return an error.

func (*ImmutableTree) GetPersistedRoots added in v1.0.0

func (t *ImmutableTree) GetPersistedRoots() map[int64][]byte

func (*ImmutableTree) GetRangeWithProof

func (t *ImmutableTree) GetRangeWithProof(startKey []byte, endKey []byte, limit int) (keys, values [][]byte, proof *RangeProof, err error)

GetRangeWithProof gets key/value pairs within the specified range and limit.

func (*ImmutableTree) GetUpgradeVersion added in v1.3.0

func (t *ImmutableTree) GetUpgradeVersion() int64

func (*ImmutableTree) GetWithProof

func (t *ImmutableTree) GetWithProof(key []byte) (value []byte, proof *RangeProof, err error)

GetWithProof gets the value under the key if it exists, or returns nil. A proof of existence or absence is returned alongside the value.

func (*ImmutableTree) GetWithProof2 added in v1.3.0

func (t *ImmutableTree) GetWithProof2(key []byte) (value []byte, proof *RangeProof, err error)

func (*ImmutableTree) Has

func (t *ImmutableTree) Has(key []byte) bool

Has returns whether or not a key exists.

func (*ImmutableTree) Hash

func (t *ImmutableTree) Hash() []byte

Hash returns the root hash.

func (*ImmutableTree) Height

func (t *ImmutableTree) Height() int8

Height returns the height of the tree.

func (*ImmutableTree) Iterate

func (t *ImmutableTree) Iterate(fn func(key []byte, value []byte) bool) (stopped bool)

Iterate iterates over all keys of the tree, in order. The keys and values must not be modified, since they may point to data stored within IAVL.

func (*ImmutableTree) IterateRange

func (t *ImmutableTree) IterateRange(start, end []byte, ascending bool, fn func(key []byte, value []byte) bool) (stopped bool)

IterateRange makes a callback for all nodes with key between start and end non-inclusive. If either are nil, then it is open on that side (nil, nil is the same as Iterate). The keys and values must not be modified, since they may point to data stored within IAVL.

func (*ImmutableTree) IterateRangeInclusive

func (t *ImmutableTree) IterateRangeInclusive(start, end []byte, ascending bool, fn func(key, value []byte, version int64) bool) (stopped bool)

IterateRangeInclusive makes a callback for all nodes with key between start and end inclusive. If either are nil, then it is open on that side (nil, nil is the same as Iterate). The keys and values must not be modified, since they may point to data stored within IAVL.

func (*ImmutableTree) RenderShape

func (t *ImmutableTree) RenderShape(indent string, encoder NodeEncoder) []string

RenderShape provides a nested tree shape, ident is prepended in each level Returns an array of strings, one per line, to join with "\n" or display otherwise

func (*ImmutableTree) SetUpgradeVersion added in v1.3.0

func (t *ImmutableTree) SetUpgradeVersion(version int64)

func (*ImmutableTree) Size

func (t *ImmutableTree) Size() int64

Size returns the number of leaf nodes in the tree.

func (*ImmutableTree) String

func (t *ImmutableTree) String() string

String returns a string representation of Tree.

func (*ImmutableTree) Version

func (t *ImmutableTree) Version() int64

Version returns the version of the tree.

type Importer

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

Importer imports data into an empty MutableTree. It is created by MutableTree.Import(). Users must call Close() when done.

ExportNodes must be imported in the order returned by Exporter, i.e. depth-first post-order (LRN).

Importer is not concurrency-safe, it is the caller's responsibility to ensure the tree is not modified while performing an import.

Example
tree, err := NewMutableTree(db.NewMemDB(), 0)
if err != nil {
	// handle err
}

tree.Set([]byte("a"), []byte{1})
tree.Set([]byte("b"), []byte{2})
tree.Set([]byte("c"), []byte{3})
_, version, _, err := tree.SaveVersion(false)
if err != nil {
	// handle err
}

itree, err := tree.GetImmutable(version)
if err != nil {
	// handle err
}
exporter := itree.Export()
defer exporter.Close()
exported := []*ExportNode{}
for {
	var node *ExportNode
	node, err = exporter.Next()
	if err == ExportDone {
		break
	} else if err != nil {
		// handle err
	}
	exported = append(exported, node)
}

newTree, err := NewMutableTree(db.NewMemDB(), 0)
if err != nil {
	// handle err
}
importer, err := newTree.Import(version)
if err != nil {
	// handle err
}
defer importer.Close()
for _, node := range exported {
	err = importer.Add(node)
	if err != nil {
		// handle err
	}
}
err = importer.Commit()
if err != nil {
	// handle err
}
Output:

func (*Importer) Add

func (i *Importer) Add(exportNode *ExportNode) error

Add adds an ExportNode to the import. ExportNodes must be added in the order returned by Exporter, i.e. depth-first post-order (LRN). Nodes are periodically flushed to the database, but the imported version is not visible until Commit() is called.

func (*Importer) Close

func (i *Importer) Close()

Close frees all resources. It is safe to call multiple times. Uncommitted nodes may already have been flushed to the database, but will not be visible.

func (*Importer) Commit

func (i *Importer) Commit() error

Commit finalizes the import by flushing any outstanding nodes to the database, making the version visible, and updating the tree metadata. It can only be called once, and calls Close() internally.

type KeyFormat

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

Provides a fixed-width lexicographically sortable []byte key format

func NewKeyFormat

func NewKeyFormat(prefix byte, layout ...int) *KeyFormat

Create a []byte key format based on a single byte prefix and fixed width key segments each of whose length is specified by by the corresponding element of layout.

For example, to store keys that could index some objects by a version number and their SHA256 hash using the form: 'c<version uint64><hash [32]byte>' then you would define the KeyFormat with:

var keyFormat = NewKeyFormat('c', 8, 32)

Then you can create a key with:

func ObjectKey(version uint64, objectBytes []byte) []byte {
	hasher := sha256.New()
	hasher.Sum(nil)
	return keyFormat.Key(version, hasher.Sum(nil))
}

func (*KeyFormat) Key

func (kf *KeyFormat) Key(args ...interface{}) []byte

Format the args passed into the key format - will panic if the arguments passed do not match the length of the segment to which they correspond. When called with no arguments returns the raw prefix (useful as a start element of the entire keys space when sorted lexicographically).

func (*KeyFormat) KeyBytes

func (kf *KeyFormat) KeyBytes(segments ...[]byte) []byte

Format the byte segments into the key format - will panic if the segment lengths do not match the layout.

func (*KeyFormat) Prefix

func (kf *KeyFormat) Prefix() string

Return the prefix as a string.

func (*KeyFormat) Scan

func (kf *KeyFormat) Scan(key []byte, args ...interface{})

Extracts the segments into the values pointed to by each of args. Each arg must be a pointer to int64, uint64, or []byte, and the width of the args must match layout.

func (*KeyFormat) ScanBytes

func (kf *KeyFormat) ScanBytes(key []byte) [][]byte

Reads out the bytes associated with each segment of the key format from key.

type LogFuncType

type LogFuncType func(level int, format string, args ...interface{})

type MutableTree

type MutableTree struct {
	*ImmutableTree // The current, working tree.
	// contains filtered or unexported fields
}

MutableTree is a persistent tree which keeps track of versions. It is not safe for concurrent use, and should be guarded by a Mutex or RWLock as appropriate. An immutable tree at a given version can be returned via GetImmutable, which is safe for concurrent access.

Given and returned key/value byte slices must not be modified, since they may point to data located inside IAVL which would also be modified.

The inner ImmutableTree should not be used directly by callers.

func NewMutableTree

func NewMutableTree(db dbm.DB, cacheSize int) (*MutableTree, error)

NewMutableTree returns a new tree with the specified cache size and datastore.

func NewMutableTreeWithOpts

func NewMutableTreeWithOpts(db dbm.DB, cacheSize int, opts *Options) (*MutableTree, error)

NewMutableTreeWithOpts returns a new tree with the specified options.

func (*MutableTree) AvailableVersions

func (tree *MutableTree) AvailableVersions() []int

AvailableVersions returns all available versions in ascending order

func (*MutableTree) DeleteVersion

func (tree *MutableTree) DeleteVersion(version int64) error

DeleteVersion deletes a tree version from disk. The version can then no longer be accessed.

func (*MutableTree) DeleteVersions

func (tree *MutableTree) DeleteVersions(versions ...int64) error

DeleteVersions deletes a series of versions from the MutableTree. Deprecated: please use DeleteVersionsRange instead.

func (*MutableTree) DeleteVersionsRange

func (tree *MutableTree) DeleteVersionsRange(fromVersion, toVersion int64, enforce ...bool) error

DeleteVersionsRange removes versions from an interval from the MutableTree (not inclusive). An error is returned if any single version has active readers. All writes happen in a single batch with a single commit.

func (*MutableTree) GetCommitVersion added in v1.0.0

func (tree *MutableTree) GetCommitVersion() int64

func (*MutableTree) GetDBReadCount

func (tree *MutableTree) GetDBReadCount() int

func (*MutableTree) GetDBReadTime

func (tree *MutableTree) GetDBReadTime() int

func (*MutableTree) GetDBWriteCount

func (tree *MutableTree) GetDBWriteCount() int

func (*MutableTree) GetDelta added in v1.0.0

func (tree *MutableTree) GetDelta()

func (*MutableTree) GetImmutable

func (tree *MutableTree) GetImmutable(version int64) (*ImmutableTree, error)

GetImmutable loads an ImmutableTree at a given version for querying. The returned tree is safe for concurrent access, provided the version is not deleted, e.g. via `DeleteVersion()`.

func (*MutableTree) GetModuleName

func (tree *MutableTree) GetModuleName() string

func (*MutableTree) GetNodeReadCount

func (tree *MutableTree) GetNodeReadCount() int

func (*MutableTree) GetUpgradeVersion added in v1.3.0

func (tree *MutableTree) GetUpgradeVersion() int64

func (*MutableTree) GetVersioned

func (tree *MutableTree) GetVersioned(key []byte, version int64) (
	index int64, value []byte,
)

GetVersioned gets the value at the specified key and version. The returned value must not be modified, since it may point to data stored within IAVL.

func (*MutableTree) GetVersionedRangeWithProof

func (tree *MutableTree) GetVersionedRangeWithProof(startKey, endKey []byte, limit int, version int64) (
	keys, values [][]byte, proof *RangeProof, err error)

GetVersionedRangeWithProof gets key/value pairs within the specified range and limit.

func (*MutableTree) GetVersionedWithProof

func (tree *MutableTree) GetVersionedWithProof(key []byte, version int64) ([]byte, *RangeProof, error)

GetVersionedWithProof gets the value under the key at the specified version if it exists, or returns nil.

func (*MutableTree) GetVersions added in v1.5.4

func (tree *MutableTree) GetVersions() ([]int64, error)

func (*MutableTree) Hash

func (tree *MutableTree) Hash() []byte

Hash returns the hash of the latest saved version of the tree, as returned by SaveVersion. If no versions have been saved, Hash returns nil.

func (*MutableTree) Import

func (tree *MutableTree) Import(version int64) (*Importer, error)

Import returns an importer for tree nodes previously exported by ImmutableTree.Export(), producing an identical IAVL tree. The caller must call Close() on the importer when done.

version should correspond to the version that was initially exported. It must be greater than or equal to the highest ExportNode version number given.

Import can only be called on an empty tree. It is the callers responsibility that no other modifications are made to the tree while importing.

func (*MutableTree) IsEmpty

func (tree *MutableTree) IsEmpty() bool

IsEmpty returns whether or not the tree has any keys. Only trees that are not empty can be saved.

func (*MutableTree) LazyLoadVersion

func (tree *MutableTree) LazyLoadVersion(targetVersion int64) (int64, error)

LazyLoadVersion attempts to lazy load only the specified target version without loading previous roots/versions. Lazy loading should be used in cases where only reads are expected. Any writes to a lazy loaded tree may result in unexpected behavior. If the targetVersion is non-positive, the latest version will be loaded by default. If the latest version is non-positive, this method performs a no-op. Otherwise, if the root does not exist, an error will be returned.

func (*MutableTree) Load

func (tree *MutableTree) Load() (int64, error)

Load the latest versioned tree from disk.

func (*MutableTree) LoadVersion

func (tree *MutableTree) LoadVersion(targetVersion int64) (int64, error)

Returns the version number of the latest version found

func (*MutableTree) LoadVersionForOverwriting

func (tree *MutableTree) LoadVersionForOverwriting(targetVersion int64) (int64, error)

LoadVersionForOverwriting attempts to load a tree at a previously committed version, or the latest version below it. Any versions greater than targetVersion will be deleted.

func (*MutableTree) NewBatch

func (tree *MutableTree) NewBatch() dbm.Batch

func (*MutableTree) PreChanges added in v1.3.0

func (tree *MutableTree) PreChanges(keys []string, setOrDel []byte)

func (*MutableTree) Remove

func (tree *MutableTree) Remove(key []byte) ([]byte, bool)

Remove removes a key from the working tree. The given key byte slice should not be modified after this call, since it may point to data stored inside IAVL.

func (*MutableTree) ResetCount

func (tree *MutableTree) ResetCount()

func (*MutableTree) Rollback

func (tree *MutableTree) Rollback()

Rollback resets the working tree to the latest saved version, discarding any unsaved modifications.

func (*MutableTree) SaveBranch added in v1.0.0

func (tree *MutableTree) SaveBranch(batch dbm.Batch, node *Node) []byte

SaveBranch saves the given node and all of its descendants. NOTE: This function clears leftNode/rigthNode recursively and calls _hash() on the given node. TODO refactor, maybe use hashWithCount() but provide a callback.

func (*MutableTree) SaveVersion

func (tree *MutableTree) SaveVersion(useDeltas bool) ([]byte, int64, TreeDelta, error)

SaveVersion saves a new tree version to disk, based on the current state of the tree. Returns the hash and new version number.

func (*MutableTree) SaveVersionAsync

func (tree *MutableTree) SaveVersionAsync(version int64, useDeltas bool) ([]byte, int64, error)

func (*MutableTree) SaveVersionSync

func (tree *MutableTree) SaveVersionSync(version int64, useDeltas bool) ([]byte, int64, error)

func (*MutableTree) Set

func (tree *MutableTree) Set(key, value []byte) bool

Set sets a key in the working tree. Nil values are invalid. The given key/value byte slices must not be modified after this call, since they point to slices stored within IAVL.

func (*MutableTree) SetDelta added in v1.0.0

func (tree *MutableTree) SetDelta(delta *TreeDelta)

func (*MutableTree) SetInitialVersion

func (tree *MutableTree) SetInitialVersion(version uint64)

SetInitialVersion sets the initial version of the tree, replacing Options.InitialVersion. It is only used during the initial SaveVersion() call for a tree with no other versions, and is otherwise ignored.

func (*MutableTree) SetUpgradeVersion added in v1.3.0

func (tree *MutableTree) SetUpgradeVersion(version int64)

func (*MutableTree) StopTree

func (tree *MutableTree) StopTree()

func (*MutableTree) String

func (tree *MutableTree) String() string

String returns a string representation of the tree.

func (*MutableTree) VersionExists

func (tree *MutableTree) VersionExists(version int64) bool

VersionExists returns whether or not a version exists.

func (*MutableTree) VersionExistsInDb added in v1.5.4

func (tree *MutableTree) VersionExistsInDb(version int64) bool

func (*MutableTree) WorkingHash

func (tree *MutableTree) WorkingHash() []byte

WorkingHash returns the hash of the current working tree.

type Node

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

Node represents a node in a Tree.

func MakeNode

func MakeNode(buf []byte) (*Node, error)

MakeNode constructs an *Node from an encoded byte slice.

The new node doesn't have its hash saved or set. The caller must set it afterwards.

func NewNode

func NewNode(key []byte, value []byte, version int64) *Node

NewNode returns a new node from a key, value and version.

func NodeJsonToNode added in v1.0.0

func NodeJsonToNode(nj *NodeJson) *Node

NodeJsonToNode get Node from NodeJson

func (*Node) PathToLeaf

func (node *Node) PathToLeaf(t *ImmutableTree, key []byte) (PathToLeaf, *Node, error)

If the key does not exist, returns the path to the next leaf left of key (w/ path), except when key is less than the least item, in which case it returns a path to the least item.

func (*Node) String

func (node *Node) String() string

String returns a string representation of the node.

type NodeCache added in v1.3.1

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

type NodeEncoder

type NodeEncoder func(id []byte, depth int, isLeaf bool) string

NodeEncoder will take an id (hash, or key for leaf nodes), the depth of the node, and whether or not this is a leaf node. It returns the string we wish to print, for iaviwer

type NodeJson added in v1.0.0

type NodeJson struct {
	Key       []byte `json:"key"`
	Value     []byte `json:"value"`
	Hash      []byte `json:"hash"`
	LeftHash  []byte `json:"left_hash"`
	RightHash []byte `json:"right_hash"`
	Version   int64  `json:"version"`
	Size      int64  `json:"size"`

	Height       int8 `json:"height"`
	Persisted    bool `json:"persisted"`
	PrePersisted bool `json:"pre_persisted"`
	// contains filtered or unexported fields
}

NodeJson provide json Marshal of Node.

func NodeToNodeJson added in v1.0.0

func NodeToNodeJson(node *Node) *NodeJson

NodeToNodeJson get NodeJson from Node

func (*NodeJson) MarshalToAmino added in v1.1.6

func (nj *NodeJson) MarshalToAmino(cdc *amino.Codec) ([]byte, error)

MarshalToAmino marshal data to amino bytes.

func (*NodeJson) UnmarshalFromAmino added in v1.1.6

func (nj *NodeJson) UnmarshalFromAmino(cdc *amino.Codec, data []byte) error

UnmarshalFromAmino unmarshal data from amino bytes.

type NodeJsonImp added in v1.1.6

type NodeJsonImp struct {
	Key       string
	NodeValue *NodeJson
}

func (*NodeJsonImp) MarshalToAmino added in v1.1.6

func (ni *NodeJsonImp) MarshalToAmino(cdc *amino.Codec) ([]byte, error)

MarshalToAmino marshal data to amino bytes.

func (*NodeJsonImp) UnmarshalFromAmino added in v1.1.6

func (ni *NodeJsonImp) UnmarshalFromAmino(cdc *amino.Codec, data []byte) error

UnmarshalFromAmino unmarshal data from amino bytes.

type Options

type Options struct {
	// Sync synchronously flushes all writes to storage, using e.g. the fsync syscall.
	// Disabling this significantly improves performance, but can lose data on e.g. power loss.
	Sync bool

	// InitialVersion specifies the initial version number. If any versions already exist below
	// this, an error is returned when loading the tree. Only used for the initial SaveVersion()
	// call.
	InitialVersion uint64
	UpgradeVersion uint64
}

Options define tree options.

func DefaultOptions

func DefaultOptions() Options

DefaultOptions returns the default options for IAVL.

type OrphanInfo added in v1.3.1

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

type PathToLeaf

type PathToLeaf []ProofInnerNode

PathToLeaf represents an inner path to a leaf node. Note that the nodes are ordered such that the last one is closest to the root of the tree.

func (PathToLeaf) Index

func (pl PathToLeaf) Index() (idx int64)

returns -1 if invalid.

func (PathToLeaf) String

func (pl PathToLeaf) String() string

type ProofInnerNode

type ProofInnerNode struct {
	Height  int8   `json:"height"`
	Size    int64  `json:"size"`
	Version int64  `json:"version"`
	Left    []byte `json:"left"`
	Right   []byte `json:"right"`
}

func (ProofInnerNode) Hash

func (pin ProofInnerNode) Hash(childHash []byte) []byte

func (ProofInnerNode) String

func (pin ProofInnerNode) String() string

type ProofLeafNode

type ProofLeafNode struct {
	Key       cmn.HexBytes `json:"key"`
	ValueHash cmn.HexBytes `json:"value"`
	Version   int64        `json:"version"`
}

func (ProofLeafNode) Hash

func (pln ProofLeafNode) Hash() []byte

func (ProofLeafNode) String

func (pln ProofLeafNode) String() string

type RangeProof

type RangeProof struct {
	// You don't need the right path because
	// it can be derived from what we have.
	LeftPath   PathToLeaf      `json:"left_path"`
	InnerNodes []PathToLeaf    `json:"inner_nodes"`
	Leaves     []ProofLeafNode `json:"leaves"`
	// contains filtered or unexported fields
}

func (*RangeProof) ComputeRootHash

func (proof *RangeProof) ComputeRootHash() []byte

ComputeRootHash computes the root hash with leaves. Returns nil if error or proof is nil. Does not verify the root hash.

func (*RangeProof) Keys

func (proof *RangeProof) Keys() (keys [][]byte)

Keys returns all the keys in the RangeProof. NOTE: The keys here may include more keys than provided by tree.GetRangeWithProof or MutableTree.GetVersionedRangeWithProof. The keys returned there are only in the provided [startKey,endKey){limit} range. The keys returned here may include extra keys, such as: - the key before startKey if startKey is provided and doesn't exist; - the key after a queried key with tree.GetWithProof, when the key is absent.

func (*RangeProof) LeftIndex

func (proof *RangeProof) LeftIndex() int64

The index of the first leaf (of the whole tree). Returns -1 if the proof is nil.

func (*RangeProof) String

func (proof *RangeProof) String() string

String returns a string representation of the proof.

func (*RangeProof) StringIndented

func (proof *RangeProof) StringIndented(indent string) string

func (*RangeProof) Verify

func (proof *RangeProof) Verify(root []byte) error

Verify that proof is valid.

func (*RangeProof) VerifyAbsence

func (proof *RangeProof) VerifyAbsence(key []byte) error

Verify that proof is valid absence proof for key. Does not assume that the proof itself is valid. For that, use Verify(root).

func (*RangeProof) VerifyItem

func (proof *RangeProof) VerifyItem(key, value []byte) error

Also see LeftIndex(). Verify that a key has some value. Does not assume that the proof itself is valid, call Verify() first.

type RuntimeState added in v1.5.0

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

type SyncMap

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

func NewSyncMap

func NewSyncMap() *SyncMap

func (*SyncMap) Clone

func (sm *SyncMap) Clone() map[int64]bool

func (*SyncMap) Delete

func (sm *SyncMap) Delete(key int64)

func (*SyncMap) DeleteWithoutLock

func (sm *SyncMap) DeleteWithoutLock(key int64)

func (*SyncMap) Get

func (sm *SyncMap) Get(key int64) bool

func (*SyncMap) Has

func (sm *SyncMap) Has(key int64) bool

func (*SyncMap) Len

func (sm *SyncMap) Len() int

func (*SyncMap) Range

func (sm *SyncMap) Range(f func(key int64, value bool) bool)

func (*SyncMap) Set

func (sm *SyncMap) Set(key int64, value bool)

type TreeDelta added in v1.0.0

type TreeDelta struct {
	NodesDelta         []*NodeJsonImp      `json:"nodes_delta"`
	OrphansDelta       []*NodeJson         `json:"orphans_delta"`
	CommitOrphansDelta []*CommitOrphansImp `json:"commit_orphans_delta"`
}

TreeDelta is the delta for applying on new version tree

func (*TreeDelta) MarshalToAmino added in v1.1.6

func (td *TreeDelta) MarshalToAmino(cdc *amino.Codec) ([]byte, error)

func (*TreeDelta) UnmarshalFromAmino added in v1.1.6

func (td *TreeDelta) UnmarshalFromAmino(cdc *amino.Codec, data []byte) error

type TreeDeltaMap added in v1.1.6

type TreeDeltaMap map[string]*TreeDelta

func (TreeDeltaMap) MarshalAmino added in v1.1.6

func (tdm TreeDeltaMap) MarshalAmino() ([]*TreeDeltaMapImp, error)

func (TreeDeltaMap) MarshalToAmino added in v1.1.6

func (tdm TreeDeltaMap) MarshalToAmino(cdc *amino.Codec) ([]byte, error)

MarshalToAmino marshal to amino bytes

func (TreeDeltaMap) UnmarshalAmino added in v1.1.6

func (tdm TreeDeltaMap) UnmarshalAmino(treeDeltaList []*TreeDeltaMapImp) error

func (TreeDeltaMap) UnmarshalFromAmino added in v1.1.6

func (tdm TreeDeltaMap) UnmarshalFromAmino(cdc *amino.Codec, data []byte) error

UnmarshalFromAmino decode bytes from amino format.

type TreeDeltaMapImp added in v1.1.6

type TreeDeltaMapImp struct {
	Key       string
	TreeValue *TreeDelta
}

TreeDeltaMapImp convert map[string]*TreeDelta to struct

func (*TreeDeltaMapImp) MarshalToAmino added in v1.1.6

func (ti *TreeDeltaMapImp) MarshalToAmino(cdc *amino.Codec) ([]byte, error)

MarshalToAmino marshal data to amino bytes

func (*TreeDeltaMapImp) UnmarshalFromAmino added in v1.1.6

func (ti *TreeDeltaMapImp) UnmarshalFromAmino(cdc *amino.Codec, data []byte) error

UnmarshalFromAmino unmarshal data from amino bytes.

type TreeMap

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

type ValueOp

type ValueOp struct {

	// To encode in ProofOp.Data.
	// Proof is nil for an empty tree.
	// The hash of an empty tree is nil.
	Proof *RangeProof `json:"proof"`
	// contains filtered or unexported fields
}

IAVLValueOp takes a key and a single value as argument and produces the root hash.

If the produced root hash matches the expected hash, the proof is good.

func NewValueOp

func NewValueOp(key []byte, proof *RangeProof) ValueOp

func (ValueOp) GetKey

func (op ValueOp) GetKey() []byte

func (ValueOp) ProofOp

func (op ValueOp) ProofOp() merkle.ProofOp

func (ValueOp) Run

func (op ValueOp) Run(args [][]byte) ([][]byte, error)

func (ValueOp) String

func (op ValueOp) String() string

type VersionInfo

type VersionInfo struct {
	IAVL      string `json:"iavl"`
	GitCommit string `json:"commit"`
	Branch    string `json:"branch"`
	GoVersion string `json:"go"`
}

VersionInfo contains useful versioning information in struct

func GetVersionInfo

func GetVersionInfo() VersionInfo

Returns VersionInfo with global vars filled in

func (VersionInfo) String

func (v VersionInfo) String() string

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