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wsevent.go
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wsevent.go
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package server
import (
"bytes"
"fmt"
"github.com/labstack/echo/v4"
"github.com/icon-project/goloop/common"
"github.com/icon-project/goloop/common/errors"
"github.com/icon-project/goloop/module"
"github.com/icon-project/goloop/server/jsonrpc"
"github.com/icon-project/goloop/service/txresult"
)
type EventRequest struct {
EventFilter
Height common.HexInt64 `json:"height"`
Logs common.HexInt32 `json:"logs,omitempty""`
}
type EventFilter struct {
Addr *common.Address `json:"addr,omitempty"`
Signature string `json:"event"`
Indexed []*string `json:"indexed,omitempty"`
Data []*string `json:"data,omitempty"`
indexedBSs [][]byte
dataBSs [][]byte
numOfArgs int
lb module.LogsBloom
indexes []int
}
type EventNotification struct {
Hash common.HexBytes `json:"hash"`
Height common.HexInt64 `json:"height"`
Index common.HexInt32 `json:"index"`
Events []common.HexInt32 `json:"events"`
Logs []module.EventLog `json:"logs,omitempty"`
}
func (wm *wsSessionManager) RunEventSession(ctx echo.Context) error {
var er EventRequest
wss, err := wm.initSession(ctx, &er)
if err != nil {
return err
}
defer wm.StopSession(wss)
if err := er.compile(); err != nil {
_ = wss.response(int(jsonrpc.ErrorCodeInvalidParams), "bad event request parameter")
return nil
}
bm := wss.chain.BlockManager()
sm := wss.chain.ServiceManager()
if bm == nil || sm == nil {
_ = wss.response(int(jsonrpc.ErrorCodeServer), "Stopped")
return nil
}
h := er.Height.Value
if gh := wss.chain.GenesisStorage().Height(); gh > h {
_ = wss.response(int(jsonrpc.ErrorCodeInvalidParams),
fmt.Sprintf("given height(%d) is lower than genesis height(%d)", h, gh))
return nil
}
_ = wss.response(0, "")
ech := make(chan error)
go readLoop(wss.c, ech)
var bch <-chan module.Block
loop:
for {
bch, err = bm.WaitForBlock(h)
if err != nil {
break loop
}
select {
case err = <-ech:
break loop
case blk := <-bch:
if !blk.LogsBloom().Contain(er.lb) {
h++
continue loop
}
rl, err := sm.ReceiptListFromResult(blk.Result(), module.TransactionGroupNormal)
if err != nil {
break loop
}
index := int32(0)
for rit := rl.Iterator(); rit.Has(); rit.Next() {
r, err := rit.Get()
if err != nil {
break loop
}
if es, el, err := er.matchWithLogs(r, er.Logs.Value != 0); err == nil && len(es) > 0 {
var en EventNotification
en.Height.Value = h
en.Hash = blk.ID()
en.Index.Value = index
en.Events = es
en.Logs = el
if err := wss.WriteJSON(&en); err != nil {
wm.logger.Infof("fail to write json EventNotification err:%+v\n", err)
break loop
}
}
index++
}
}
h++
}
wm.logger.Warnf("%+v\n", err)
return nil
}
func (f *EventFilter) compile() error {
lb := txresult.NewLogsBloom(nil)
if f.Addr != nil {
lb.AddAddressOfLog(f.Addr)
}
f.numOfArgs = len(f.Indexed) + len(f.Data)
name, pts := txresult.DecomposeEventSignature(f.Signature)
if len(name) == 0 || pts == nil || len(pts) < f.numOfArgs {
return errors.NewBase(errors.IllegalArgumentError, "bad event signature")
}
lb.AddIndexedOfLog(0, []byte(f.Signature))
idx := 0
f.indexedBSs = make([][]byte, len(f.Indexed))
for i, arg := range f.Indexed {
if arg != nil {
bs, err := txresult.EventDataStringToBytesByType(pts[idx], string(*arg))
if err != nil {
return errors.NewBase(errors.IllegalArgumentError, "bad event data")
}
lb.AddIndexedOfLog(i+1, bs)
f.indexedBSs[i] = bs
}
idx++
}
f.dataBSs = make([][]byte, len(f.Data))
for i, arg := range f.Data {
if arg != nil {
bs, err := txresult.EventDataStringToBytesByType(pts[idx], string(*arg))
if err != nil {
return errors.NewBase(errors.IllegalArgumentError, "bad event data")
}
f.dataBSs[i] = bs
}
idx++
}
f.lb = lb
return nil
}
// bytesEqual check equality of byte slice.
// But it doesn't assume nil as empty bytes.
func bytesEqual(b1 []byte, b2 []byte) bool {
if b1 == nil && b2 == nil {
return true
}
if b1 == nil || b2 == nil {
return false
}
return bytes.Equal(b1, b2)
}
func (f *EventFilter) matchWithLogs(r module.Receipt, includeLogs bool) ([]common.HexInt32, []module.EventLog, error) {
var indexes []common.HexInt32
var logs []module.EventLog
if err := f.filterFunc(r, func(idx int, log module.EventLog) {
indexes = append(indexes, common.HexInt32{Value: int32(idx)})
if includeLogs {
logs = append(logs, log)
}
}); err != nil {
return nil, nil, err
}
return indexes, logs, nil
}
func (f *EventFilter) match(r module.Receipt) ([]common.HexInt32, bool) {
eventIndexes := make([]common.HexInt32, 0)
if err := f.filterFunc(r, func(idx int, log module.EventLog) {
eventIndexes = append(eventIndexes, common.HexInt32{int32(idx)})
}); err != nil {
return []common.HexInt32{}, false
} else {
return eventIndexes, len(eventIndexes) > 0
}
return eventIndexes, false
}
func (f *EventFilter) filterFunc(r module.Receipt, v func(idx int, log module.EventLog)) error {
if r.LogsBloom().Contain(f.lb) {
loop:
for it, idx := r.EventLogIterator(), 0; it.Has(); _, idx = it.Next(), idx+1 {
el, err := it.Get()
if err != nil {
return err
}
if bytes.Equal([]byte(f.Signature), el.Indexed()[0]) {
if f.Addr != nil && !el.Address().Equal(f.Addr) {
continue loop
}
if f.numOfArgs > 0 {
if (len(el.Indexed()) + len(el.Data())) <= f.numOfArgs {
continue loop
}
for i, arg := range f.indexedBSs {
if arg != nil && !bytesEqual(arg, el.Indexed()[i+1]) {
continue loop
}
}
for i, arg := range f.dataBSs {
if arg != nil && !bytesEqual(arg, el.Data()[i]) {
continue loop
}
}
}
v(idx, el)
}
}
}
return nil
}