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iavlstore.go
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iavlstore.go
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package store
import (
"fmt"
"io"
"sync"
"github.com/tendermint/go-amino"
"github.com/tendermint/iavl"
abci "github.com/tendermint/tendermint/abci/types"
cmn "github.com/tendermint/tendermint/libs/common"
dbm "github.com/tendermint/tendermint/libs/db"
sdk "github.com/cosmos/cosmos-sdk/types"
)
const (
defaultIAVLCacheSize = 10000
)
// load the iavl store
func LoadIAVLStore(db dbm.DB, id CommitID, pruning sdk.PruningStrategy) (CommitStore, error) {
tree := iavl.NewMutableTree(db, defaultIAVLCacheSize)
_, err := tree.LoadVersion(id.Version)
if err != nil {
return nil, err
}
iavl := newIAVLStore(tree, int64(0), int64(0))
iavl.SetPruning(pruning)
return iavl, nil
}
//----------------------------------------
var _ KVStore = (*iavlStore)(nil)
var _ CommitStore = (*iavlStore)(nil)
var _ Queryable = (*iavlStore)(nil)
// iavlStore Implements KVStore and CommitStore.
type iavlStore struct {
// The underlying tree.
tree *iavl.MutableTree
// How many old versions we hold onto.
// A value of 0 means keep no recent states.
numRecent int64
// This is the distance between state-sync waypoint states to be stored.
// See https://github.com/tendermint/tendermint/issues/828
// A value of 1 means store every state.
// A value of 0 means store no waypoints. (node cannot assist in state-sync)
// By default this value should be set the same across all nodes,
// so that nodes can know the waypoints their peers store.
storeEvery int64
}
// CONTRACT: tree should be fully loaded.
// nolint: unparam
func newIAVLStore(tree *iavl.MutableTree, numRecent int64, storeEvery int64) *iavlStore {
st := &iavlStore{
tree: tree,
numRecent: numRecent,
storeEvery: storeEvery,
}
return st
}
// Implements Committer.
func (st *iavlStore) Commit() CommitID {
// Save a new version.
hash, version, err := st.tree.SaveVersion()
if err != nil {
// TODO: Do we want to extend Commit to allow returning errors?
panic(err)
}
// Release an old version of history, if not a sync waypoint.
previous := version - 1
if st.numRecent < previous {
toRelease := previous - st.numRecent
if st.storeEvery == 0 || toRelease%st.storeEvery != 0 {
err := st.tree.DeleteVersion(toRelease)
if err != nil && err.(cmn.Error).Data() != iavl.ErrVersionDoesNotExist {
panic(err)
}
}
}
return CommitID{
Version: version,
Hash: hash,
}
}
// Implements Committer.
func (st *iavlStore) LastCommitID() CommitID {
return CommitID{
Version: st.tree.Version(),
Hash: st.tree.Hash(),
}
}
// Implements Committer.
func (st *iavlStore) SetPruning(pruning sdk.PruningStrategy) {
switch pruning {
case sdk.PruneEverything:
st.numRecent = 0
st.storeEvery = 0
case sdk.PruneNothing:
st.storeEvery = 1
case sdk.PruneSyncable:
st.numRecent = 100
st.storeEvery = 10000
}
}
// VersionExists returns whether or not a given version is stored.
func (st *iavlStore) VersionExists(version int64) bool {
return st.tree.VersionExists(version)
}
// Implements Store.
func (st *iavlStore) GetStoreType() StoreType {
return sdk.StoreTypeIAVL
}
// Implements Store.
func (st *iavlStore) CacheWrap() CacheWrap {
return NewCacheKVStore(st)
}
// CacheWrapWithTrace implements the Store interface.
func (st *iavlStore) CacheWrapWithTrace(w io.Writer, tc TraceContext) CacheWrap {
return NewCacheKVStore(NewTraceKVStore(st, w, tc))
}
// Implements KVStore.
func (st *iavlStore) Set(key, value []byte) {
st.tree.Set(key, value)
}
// Implements KVStore.
func (st *iavlStore) Get(key []byte) (value []byte) {
_, v := st.tree.Get(key)
return v
}
// Implements KVStore.
func (st *iavlStore) Has(key []byte) (exists bool) {
return st.tree.Has(key)
}
// Implements KVStore.
func (st *iavlStore) Delete(key []byte) {
st.tree.Remove(key)
}
// Implements KVStore
func (st *iavlStore) Prefix(prefix []byte) KVStore {
return prefixStore{st, prefix}
}
// Implements KVStore
func (st *iavlStore) Gas(meter GasMeter, config GasConfig) KVStore {
return NewGasKVStore(meter, config, st)
}
// Implements KVStore.
func (st *iavlStore) Iterator(start, end []byte) Iterator {
return newIAVLIterator(st.tree.ImmutableTree, start, end, true)
}
// Implements KVStore.
func (st *iavlStore) ReverseIterator(start, end []byte) Iterator {
return newIAVLIterator(st.tree.ImmutableTree, start, end, false)
}
// Handle gatest the latest height, if height is 0
func getHeight(tree *iavl.MutableTree, req abci.RequestQuery) int64 {
height := req.Height
if height == 0 {
latest := tree.Version()
if tree.VersionExists(latest - 1) {
height = latest - 1
} else {
height = latest
}
}
return height
}
// Query implements ABCI interface, allows queries
//
// by default we will return from (latest height -1),
// as we will have merkle proofs immediately (header height = data height + 1)
// If latest-1 is not present, use latest (which must be present)
// if you care to have the latest data to see a tx results, you must
// explicitly set the height you want to see
func (st *iavlStore) Query(req abci.RequestQuery) (res abci.ResponseQuery) {
if len(req.Data) == 0 {
msg := "Query cannot be zero length"
return sdk.ErrTxDecode(msg).QueryResult()
}
tree := st.tree
// store the height we chose in the response, with 0 being changed to the
// latest height
res.Height = getHeight(tree, req)
switch req.Path {
case "/store", "/key": // Get by key
key := req.Data // Data holds the key bytes
res.Key = key
if !st.VersionExists(res.Height) {
res.Log = cmn.ErrorWrap(iavl.ErrVersionDoesNotExist, "").Error()
break
}
if req.Prove {
value, proof, err := tree.GetVersionedWithProof(key, res.Height)
if err != nil {
res.Log = err.Error()
break
}
res.Value = value
cdc := amino.NewCodec()
p, err := cdc.MarshalBinary(proof)
if err != nil {
res.Log = err.Error()
break
}
res.Proof = p
} else {
_, res.Value = tree.GetVersioned(key, res.Height)
}
case "/subspace":
subspace := req.Data
res.Key = subspace
var KVs []KVPair
iterator := sdk.KVStorePrefixIterator(st, subspace)
for ; iterator.Valid(); iterator.Next() {
KVs = append(KVs, KVPair{iterator.Key(), iterator.Value()})
}
iterator.Close()
res.Value = cdc.MustMarshalBinary(KVs)
default:
msg := fmt.Sprintf("Unexpected Query path: %v", req.Path)
return sdk.ErrUnknownRequest(msg).QueryResult()
}
return
}
//----------------------------------------
// Implements Iterator.
type iavlIterator struct {
// Underlying store
tree *iavl.ImmutableTree
// Domain
start, end []byte
// Iteration order
ascending bool
// Channel to push iteration values.
iterCh chan cmn.KVPair
// Close this to release goroutine.
quitCh chan struct{}
// Close this to signal that state is initialized.
initCh chan struct{}
//----------------------------------------
// What follows are mutable state.
mtx sync.Mutex
invalid bool // True once, true forever
key []byte // The current key
value []byte // The current value
}
var _ Iterator = (*iavlIterator)(nil)
// newIAVLIterator will create a new iavlIterator.
// CONTRACT: Caller must release the iavlIterator, as each one creates a new
// goroutine.
func newIAVLIterator(tree *iavl.ImmutableTree, start, end []byte, ascending bool) *iavlIterator {
iter := &iavlIterator{
tree: tree,
start: cp(start),
end: cp(end),
ascending: ascending,
iterCh: make(chan cmn.KVPair, 0), // Set capacity > 0?
quitCh: make(chan struct{}),
initCh: make(chan struct{}),
}
go iter.iterateRoutine()
go iter.initRoutine()
return iter
}
// Run this to funnel items from the tree to iterCh.
func (iter *iavlIterator) iterateRoutine() {
iter.tree.IterateRange(
iter.start, iter.end, iter.ascending,
func(key, value []byte) bool {
select {
case <-iter.quitCh:
return true // done with iteration.
case iter.iterCh <- cmn.KVPair{key, value}:
return false // yay.
}
},
)
close(iter.iterCh) // done.
}
// Run this to fetch the first item.
func (iter *iavlIterator) initRoutine() {
iter.receiveNext()
close(iter.initCh)
}
// Implements Iterator.
func (iter *iavlIterator) Domain() (start, end []byte) {
return iter.start, iter.end
}
// Implements Iterator.
func (iter *iavlIterator) Valid() bool {
iter.waitInit()
iter.mtx.Lock()
validity := !iter.invalid
iter.mtx.Unlock()
return validity
}
// Implements Iterator.
func (iter *iavlIterator) Next() {
iter.waitInit()
iter.mtx.Lock()
iter.assertIsValid(true)
iter.receiveNext()
iter.mtx.Unlock()
}
// Implements Iterator.
func (iter *iavlIterator) Key() []byte {
iter.waitInit()
iter.mtx.Lock()
iter.assertIsValid(true)
key := iter.key
iter.mtx.Unlock()
return key
}
// Implements Iterator.
func (iter *iavlIterator) Value() []byte {
iter.waitInit()
iter.mtx.Lock()
iter.assertIsValid(true)
val := iter.value
iter.mtx.Unlock()
return val
}
// Implements Iterator.
func (iter *iavlIterator) Close() {
close(iter.quitCh)
}
//----------------------------------------
func (iter *iavlIterator) setNext(key, value []byte) {
iter.assertIsValid(false)
iter.key = key
iter.value = value
}
func (iter *iavlIterator) setInvalid() {
iter.assertIsValid(false)
iter.invalid = true
}
func (iter *iavlIterator) waitInit() {
<-iter.initCh
}
func (iter *iavlIterator) receiveNext() {
kvPair, ok := <-iter.iterCh
if ok {
iter.setNext(kvPair.Key, kvPair.Value)
} else {
iter.setInvalid()
}
}
// assertIsValid panics if the iterator is invalid. If unlockMutex is true,
// it also unlocks the mutex before panicing, to prevent deadlocks in code that
// recovers from panics
func (iter *iavlIterator) assertIsValid(unlockMutex bool) {
if iter.invalid {
if unlockMutex {
iter.mtx.Unlock()
}
panic("invalid iterator")
}
}
//----------------------------------------
func cp(bz []byte) (ret []byte) {
if bz == nil {
return nil
}
ret = make([]byte, len(bz))
copy(ret, bz)
return ret
}