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events.go
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events.go
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package state
import (
"fmt"
"io"
"github.com/hyperledger/burrow/execution/exec"
)
func (ws *writeState) AddBlock(be *exec.BlockExecution) error {
tree, err := ws.forest.Writer(keys.Event.Prefix())
if err != nil {
return err
}
txHashTree, err := ws.forest.Writer(keys.TxHash.Prefix())
if err != nil {
return err
}
// Index transactions so they can be retrieved by their TxHash
for index, ev := range be.StreamEvents() {
// Store with prefix for scanning later
key := keys.Event.KeyNoPrefix(be.Height, uint64(index))
bs, err := ev.Encode()
if err != nil {
return err
}
// Set StreamEvent itself
tree.Set(key, bs)
if ev.BeginTx != nil {
// Set reference to TxExecution
txHashTree.Set(keys.TxHash.KeyNoPrefix(ev.BeginTx.TxHeader.TxHash), key)
}
}
return nil
}
func (s *ReadState) IterateStreamEvents(start, end *exec.StreamKey, consumer func(*exec.StreamEvent) error) error {
tree, err := s.Forest.Reader(keys.Event.Prefix())
if err != nil {
return err
}
var startKey, endKey []byte
if start != nil {
startKey = keys.Event.KeyNoPrefix(start.Height, start.Index)
}
if end != nil {
endKey = keys.Event.KeyNoPrefix(end.Height, end.Index)
}
return tree.Iterate(startKey, endKey, true, func(_, value []byte) error {
txe, err := exec.DecodeStreamEvent(value)
if err != nil {
return fmt.Errorf("error unmarshalling BlockExecution in GetBlocks: %v", err)
}
return consumer(txe)
})
}
func (s *ReadState) TxsAtHeight(height uint64) ([]*exec.TxExecution, error) {
var stack exec.TxStack
var txExecutions []*exec.TxExecution
err := s.IterateStreamEvents(&exec.StreamKey{Height: height}, &exec.StreamKey{Height: height + 1},
func(ev *exec.StreamEvent) error {
// Keep trying to consume TxExecutions at from events at this height
txe := stack.Consume(ev)
if txe != nil {
txExecutions = append(txExecutions, txe)
}
return nil
})
if err != nil && err != io.EOF {
return nil, err
}
return txExecutions, nil
}
func (s *ReadState) StreamEvent(height, index uint64) (*exec.StreamEvent, error) {
tree, err := s.Forest.Reader(keys.Event.Prefix())
if err != nil {
return nil, err
}
// Note: stored with prefix for scanning
bs := tree.Get(keys.Event.KeyNoPrefix(height, index))
if len(bs) == 0 {
return nil, nil
}
return exec.DecodeStreamEvent(bs)
}
func (s *ReadState) TxByHash(txHash []byte) (*exec.TxExecution, error) {
const errHeader = "TxByHash():"
eventKeyByTxHashTree, err := s.Forest.Reader(keys.TxHash.Prefix())
if err != nil {
return nil, err
}
eventKey := eventKeyByTxHashTree.Get(keys.TxHash.KeyNoPrefix(txHash))
if len(eventKey) == 0 {
return nil, nil
}
eventTree, err := s.Forest.Reader(keys.Event.Prefix())
if err != nil {
return nil, err
}
bs := eventTree.Get(eventKey)
if len(bs) == 0 {
return nil, fmt.Errorf("%s could not retieve transaction with TxHash %X despite finding reference",
errHeader, txHash)
}
ev, err := exec.DecodeStreamEvent(bs)
if err != nil {
return nil, err
}
if ev.BeginTx == nil {
return nil, fmt.Errorf("%s StreamEvent %v is not a transaction despite being indexed as such",
errHeader, ev)
}
start := new(exec.StreamKey)
// Scan out position in storage
err = keys.Event.ScanNoPrefix(eventKey, &start.Height, &start.Index)
if err != nil {
return nil, fmt.Errorf("%s could not scan height and index from tx key %X: %v", errHeader, eventKey, err)
}
// Iterate to end of block - we will break the iteration once we have scanned the tx so this is an upper bound
end := &exec.StreamKey{Height: start.Height + 1}
// Establish iteration state
var stack exec.TxStack
var txe *exec.TxExecution
err = s.IterateStreamEvents(start, end, func(ev *exec.StreamEvent) error {
txe = stack.Consume(ev)
if txe != nil {
return io.EOF
}
return nil
})
if err != nil && err != io.EOF {
return nil, fmt.Errorf("%s error iterating over stream events %v", errHeader, err)
}
// Possibly nil if not found
return txe, nil
}