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evtprocessor.go
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evtprocessor.go
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// Copyright © 2023 Kaleido, Inc.
//
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package events
import (
"encoding/json"
"sync"
"github.com/hyperledger/firefly-fabconnect/internal/events/api"
log "github.com/sirupsen/logrus"
)
type eventData struct {
event *api.EventEntry
batchComplete func(*api.EventEntry)
}
type evtProcessor struct {
subID string
stream *eventStream
blockHWM uint64
hwmSync sync.Mutex
}
func newEvtProcessor(subID string, stream *eventStream) *evtProcessor {
return &evtProcessor{
subID: subID,
stream: stream,
}
}
func (ep *evtProcessor) batchComplete(newestEvent *api.EventEntry) {
ep.hwmSync.Lock()
newHWM := newestEvent.BlockNumber + 1
if newHWM > ep.blockHWM {
ep.blockHWM = newHWM
}
ep.hwmSync.Unlock()
log.Debugf("%s: High-Water-Mark: %d", ep.subID, ep.blockHWM)
}
func (ep *evtProcessor) getBlockHWM() uint64 {
ep.hwmSync.Lock()
v := ep.blockHWM
ep.hwmSync.Unlock()
return v
}
func (ep *evtProcessor) initBlockHWM(intVal uint64) {
ep.hwmSync.Lock()
ep.blockHWM = intVal
ep.hwmSync.Unlock()
}
func (ep *evtProcessor) processEventEntry(subInfo *api.SubscriptionInfo, entry *api.EventEntry) (err error) {
entry.SubID = subInfo.ID
payloadType := subInfo.PayloadType
if payloadType == "" {
payloadType = api.EventPayloadTypeBytes
}
payloadBytes, ok := entry.Payload.([]byte)
if ok {
switch payloadType {
case api.EventPayloadTypeString:
entry.Payload = string(payloadBytes)
case api.EventPayloadTypeStringifiedJSON, api.EventPayloadTypeJSON:
structuredMap := make(map[string]interface{})
err := json.Unmarshal(payloadBytes, &structuredMap)
if err != nil {
log.Errorf("Failed to unmarshal event payload for [sub:%s,name:%s,block=%d]", entry.SubID, entry.EventName, entry.BlockNumber)
} else {
entry.Payload = structuredMap
}
}
}
result := eventData{
event: entry,
batchComplete: ep.batchComplete,
}
// Ok, now we have the full event in a friendly map output. Pass it down to the stream
log.Infof("%s: Dispatching event. BlockNumber=%d TxId=%s", subInfo.ID, result.event.BlockNumber, result.event.TransactionID)
ep.stream.eventHandler(&result)
return nil
}