346 lines
7.3 KiB
Go
346 lines
7.3 KiB
Go
package store
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import (
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"fmt"
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"sync"
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abci "github.com/tendermint/abci/types"
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"github.com/tendermint/iavl"
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cmn "github.com/tendermint/tmlibs/common"
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dbm "github.com/tendermint/tmlibs/db"
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sdk "github.com/cosmos/cosmos-sdk/types"
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)
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const (
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defaultIAVLCacheSize = 10000
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defaultIAVLNumHistory = 1<<53 - 1 // DEPRECATED
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)
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func LoadIAVLStore(db dbm.DB, id CommitID) (CommitStore, error) {
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tree := iavl.NewVersionedTree(db, defaultIAVLCacheSize)
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err := tree.LoadVersion(id.Version)
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if err != nil {
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return nil, err
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}
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store := newIAVLStore(tree, defaultIAVLNumHistory)
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return store, nil
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}
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//----------------------------------------
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var _ KVStore = (*iavlStore)(nil)
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var _ CommitStore = (*iavlStore)(nil)
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var _ Queryable = (*iavlStore)(nil)
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// iavlStore Implements KVStore and CommitStore.
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type iavlStore struct {
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// The underlying tree.
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tree *iavl.VersionedTree
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// How many old versions we hold onto.
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// A value of 0 means keep all history.
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numHistory int64
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}
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// CONTRACT: tree should be fully loaded.
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func newIAVLStore(tree *iavl.VersionedTree, numHistory int64) *iavlStore {
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st := &iavlStore{
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tree: tree,
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numHistory: numHistory,
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}
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return st
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}
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// Implements Committer.
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func (st *iavlStore) Commit() CommitID {
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// Save a new version.
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hash, version, err := st.tree.SaveVersion()
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if err != nil {
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// TODO: Do we want to extend Commit to allow returning errors?
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panic(err)
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}
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// Release an old version of history
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if st.numHistory > 0 && (st.numHistory < st.tree.Version64()) {
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toRelease := version - st.numHistory
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st.tree.DeleteVersion(toRelease)
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}
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return CommitID{
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Version: version,
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Hash: hash,
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}
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}
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// Implements Committer.
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func (st *iavlStore) LastCommitID() CommitID {
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return CommitID{
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Version: st.tree.Version64(),
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Hash: st.tree.Hash(),
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}
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}
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// Implements Store.
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func (st *iavlStore) GetStoreType() StoreType {
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return sdk.StoreTypeIAVL
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}
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// Implements Store.
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func (st *iavlStore) CacheWrap() CacheWrap {
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return NewCacheKVStore(st)
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}
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// Implements KVStore.
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func (st *iavlStore) Set(key, value []byte) {
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st.tree.Set(key, value)
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}
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// Implements KVStore.
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func (st *iavlStore) Get(key []byte) (value []byte) {
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_, v := st.tree.Get(key)
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return v
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}
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// Implements KVStore.
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func (st *iavlStore) Has(key []byte) (exists bool) {
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return st.tree.Has(key)
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}
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// Implements KVStore.
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func (st *iavlStore) Delete(key []byte) {
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st.tree.Remove(key)
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}
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// Implements KVStore.
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func (st *iavlStore) Iterator(start, end []byte) Iterator {
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return newIAVLIterator(st.tree.Tree(), start, end, true)
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}
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func (st *iavlStore) Subspace(prefix []byte) Iterator {
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end := make([]byte, len(prefix))
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copy(end, prefix)
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end[len(end)-1]++
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return st.Iterator(prefix, end)
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}
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// Implements IterKVStore.
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func (st *iavlStore) ReverseIterator(start, end []byte) Iterator {
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return newIAVLIterator(st.tree.Tree(), start, end, false)
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}
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// Query implements ABCI interface, allows queries
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//
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// by default we will return from (latest height -1),
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// as we will have merkle proofs immediately (header height = data height + 1)
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// If latest-1 is not present, use latest (which must be present)
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// if you care to have the latest data to see a tx results, you must
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// explicitly set the height you want to see
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func (st *iavlStore) Query(req abci.RequestQuery) (res abci.ResponseQuery) {
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if len(req.Data) == 0 {
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msg := "Query cannot be zero length"
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return sdk.ErrTxParse(msg).Result().ToQuery()
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}
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tree := st.tree
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height := req.Height
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if height == 0 {
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latest := tree.Version64()
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if tree.VersionExists(latest - 1) {
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height = latest - 1
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} else {
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height = latest
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}
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}
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// store the height we chose in the response
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res.Height = height
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switch req.Path {
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case "/store", "/key": // Get by key
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key := req.Data // Data holds the key bytes
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res.Key = key
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if req.Prove {
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value, proof, err := tree.GetVersionedWithProof(key, height)
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if err != nil {
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res.Log = err.Error()
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break
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}
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res.Value = value
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res.Proof = proof.Bytes()
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} else {
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_, res.Value = tree.GetVersioned(key, height)
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}
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default:
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msg := fmt.Sprintf("Unexpected Query path: %v", req.Path)
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return sdk.ErrUnknownRequest(msg).Result().ToQuery()
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}
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return
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}
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//----------------------------------------
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// Implements Iterator.
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type iavlIterator struct {
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// Underlying store
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tree *iavl.Tree
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// Domain
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start, end []byte
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// Iteration order
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ascending bool
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// Channel to push iteration values.
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iterCh chan cmn.KVPair
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// Close this to release goroutine.
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quitCh chan struct{}
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// Close this to signal that state is initialized.
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initCh chan struct{}
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//----------------------------------------
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// What follows are mutable state.
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mtx sync.Mutex
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invalid bool // True once, true forever
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key []byte // The current key
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value []byte // The current value
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}
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var _ Iterator = (*iavlIterator)(nil)
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// newIAVLIterator will create a new iavlIterator.
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// CONTRACT: Caller must release the iavlIterator, as each one creates a new
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// goroutine.
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func newIAVLIterator(tree *iavl.Tree, start, end []byte, ascending bool) *iavlIterator {
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iter := &iavlIterator{
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tree: tree,
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start: cp(start),
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end: cp(end),
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ascending: ascending,
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iterCh: make(chan cmn.KVPair, 0), // Set capacity > 0?
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quitCh: make(chan struct{}),
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initCh: make(chan struct{}),
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}
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go iter.iterateRoutine()
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go iter.initRoutine()
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return iter
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}
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// Run this to funnel items from the tree to iterCh.
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func (iter *iavlIterator) iterateRoutine() {
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iter.tree.IterateRange(
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iter.start, iter.end, iter.ascending,
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func(key, value []byte) bool {
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select {
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case <-iter.quitCh:
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return true // done with iteration.
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case iter.iterCh <- cmn.KVPair{key, value}:
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return false // yay.
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}
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},
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)
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close(iter.iterCh) // done.
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}
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// Run this to fetch the first item.
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func (iter *iavlIterator) initRoutine() {
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iter.receiveNext()
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close(iter.initCh)
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}
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// Implements Iterator.
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func (iter *iavlIterator) Domain() (start, end []byte) {
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return iter.start, iter.end
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}
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// Implements Iterator.
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func (iter *iavlIterator) Valid() bool {
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iter.waitInit()
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iter.mtx.Lock()
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defer iter.mtx.Unlock()
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return !iter.invalid
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}
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// Implements Iterator.
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func (iter *iavlIterator) Next() {
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iter.waitInit()
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iter.mtx.Lock()
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defer iter.mtx.Unlock()
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iter.assertIsValid()
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iter.receiveNext()
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}
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// Implements Iterator.
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func (iter *iavlIterator) Key() []byte {
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iter.waitInit()
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iter.mtx.Lock()
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defer iter.mtx.Unlock()
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iter.assertIsValid()
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return iter.key
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}
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// Implements Iterator.
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func (iter *iavlIterator) Value() []byte {
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iter.waitInit()
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iter.mtx.Lock()
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defer iter.mtx.Unlock()
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iter.assertIsValid()
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return iter.value
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}
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// Implements Iterator.
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func (iter *iavlIterator) Close() {
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close(iter.quitCh)
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}
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//----------------------------------------
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func (iter *iavlIterator) setNext(key, value []byte) {
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iter.assertIsValid()
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iter.key = key
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iter.value = value
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}
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func (iter *iavlIterator) setInvalid() {
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iter.assertIsValid()
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iter.invalid = true
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}
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func (iter *iavlIterator) waitInit() {
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<-iter.initCh
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}
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func (iter *iavlIterator) receiveNext() {
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kvPair, ok := <-iter.iterCh
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if ok {
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iter.setNext(kvPair.Key, kvPair.Value)
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} else {
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iter.setInvalid()
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}
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}
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func (iter *iavlIterator) assertIsValid() {
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if iter.invalid {
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panic("invalid iterator")
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}
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}
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//----------------------------------------
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func cp(bz []byte) (ret []byte) {
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ret = make([]byte, len(bz))
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copy(ret, bz)
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return ret
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}
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