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events.go
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events.go
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package state
import (
"bytes"
"fmt"
"io"
"github.com/klyed/hivesmartchain/encoding"
"github.com/klyed/hivesmartchain/execution/exec"
"github.com/klyed/hivesmartchain/storage"
)
func (ws *writeState) AddBlock(be *exec.BlockExecution) error {
// If there are no transactions, do not store anything. This reduces the amount of data we store and
// prevents the iavl tree from changing, which means the AppHash does not change. If the AppHash changes then
// Tendermint will always produce another block. If we change the AppHash on empty blocks then we will continue
// creating empty blocks even if we have been configure to not do so.
// TODO: we would prefer not to do this and instead store sequential monotonic blocks, once this:
// https://github.com/tendermint/tendermint/issues/1909 is resolved we should be able to suppress empty blocks
// even when the AppHash changes
if len(be.TxExecutions) == 0 {
return nil
}
buf := new(bytes.Buffer)
var offset int
for _, ev := range be.StreamEvents() {
switch {
case ev.BeginTx != nil:
val := &exec.TxExecutionKey{Height: be.Height, Offset: uint64(offset)}
bs, err := encoding.Encode(val)
if err != nil {
return err
}
// Set reference to TxExecution
err = ws.plain.Set(keys.TxHash.Key(ev.BeginTx.TxHeader.TxHash), bs)
if err != nil {
return err
}
}
n, err := encoding.WriteMessage(buf, ev)
if err != nil {
return err
}
offset += n
}
tree, err := ws.forest.Writer(keys.Event.Prefix())
if err != nil {
return err
}
key := keys.Event.KeyNoPrefix(be.Height)
tree.Set(key, buf.Bytes())
return nil
}
// Iterate SteamEvents over the closed interval [startHeight, endHeight] - i.e. startHeight and endHeight inclusive
func (s *ReadState) IterateStreamEvents(startHeight, endHeight *uint64, sortOrder storage.SortOrder,
consumer func(*exec.StreamEvent) error) error {
tree, err := s.Forest.Reader(keys.Event.Prefix())
if err != nil {
return err
}
var startKey, endKey []byte
if startHeight != nil {
startKey = keys.Event.KeyNoPrefix(*startHeight)
}
if endHeight != nil {
// Convert to inclusive end bounds since this generally makes more sense for block height
endKey = keys.Event.KeyNoPrefix(*endHeight + 1)
}
return tree.Iterate(startKey, endKey, sortOrder == storage.AscendingSort, func(_, value []byte) error {
buf := bytes.NewBuffer(value)
for {
ev := new(exec.StreamEvent)
_, err := encoding.ReadMessage(buf, ev)
if err != nil {
if err == io.EOF {
return nil
}
return err
}
err = consumer(ev)
if err != nil {
return err
}
}
})
}
func (s *ReadState) TxsAtHeight(height uint64) ([]*exec.TxExecution, error) {
const errHeader = "TxAtHeight():"
var stack exec.TxStack
var txExecutions []*exec.TxExecution
err := s.IterateStreamEvents(&height, &height, storage.AscendingSort, func(ev *exec.StreamEvent) error {
// Keep trying to consume TxExecutions at from events at this height
txe, err := stack.Consume(ev)
if err != nil {
return err
}
if txe != nil {
txExecutions = append(txExecutions, txe)
}
return nil
})
if err != nil && err != io.EOF {
return nil, fmt.Errorf("%s %v", errHeader, err)
}
return txExecutions, nil
}
func (s *ReadState) TxByHash(txHash []byte) (*exec.TxExecution, error) {
const errHeader = "TxByHash():"
bs, err := s.Plain.Get(keys.TxHash.Key(txHash))
if err != nil {
return nil, err
}
if len(bs) == 0 {
return nil, nil
}
key := new(exec.TxExecutionKey)
err = encoding.Decode(bs, key)
if err != nil {
return nil, err
}
blockTree, err := s.Forest.Reader(keys.Event.Prefix())
if err != nil {
return nil, err
}
bs, err = blockTree.Get(keys.Event.KeyNoPrefix(key.Height))
if err != nil {
return nil, err
} else if len(bs) == 0 {
return nil, fmt.Errorf("%s could not retrieve transaction with TxHash %X despite finding reference",
errHeader, txHash)
}
buf := bytes.NewBuffer(bs[key.Offset:])
var stack exec.TxStack
for {
ev := new(exec.StreamEvent)
_, err := encoding.ReadMessage(buf, ev)
if err != nil {
return nil, err
}
txe, err := stack.Consume(ev)
if err != nil {
return nil, fmt.Errorf("%s: %v", errHeader, err)
}
if txe != nil {
return txe, nil
}
}
}
// Get the last block height we stored in state
func (s *ReadState) LastStoredHeight() (uint64, error) {
var height uint64
err := s.IterateStreamEvents(nil, nil, storage.DescendingSort,
func(event *exec.StreamEvent) error {
if event.EndBlock != nil {
height = event.EndBlock.Height
return io.EOF
}
return nil
})
if err != nil && err != io.EOF {
return 0, fmt.Errorf("LastStoredHeight: %w", err)
}
return height, nil
}