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event_origin_filter.go
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/
event_origin_filter.go
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package transform
import (
"fmt"
"github.com/streamingfast/bstream"
"github.com/streamingfast/bstream/transform"
"github.com/streamingfast/dstore"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/anypb"
pbtransform "github.com/graphprotocol/proto-cosmos/pb/sf/cosmos/transform/v1"
pbcosmos "github.com/graphprotocol/proto-cosmos/pb/sf/cosmos/type/v1"
)
type EventOrigin string
const (
DeliverTx EventOrigin = "DeliverTx"
BeginBlock EventOrigin = "BeginBlock"
EndBlock EventOrigin = "EndBlock"
)
var EventOriginFilterMessageName = proto.MessageName(&pbtransform.EventOriginFilter{})
func EventOriginFilterFactory(indexStore dstore.Store, possibleIndexSizes []uint64) *transform.Factory {
return &transform.Factory{
Obj: &pbtransform.EventOriginFilter{},
NewFunc: func(message *anypb.Any) (transform.Transform, error) {
if message.MessageName() != EventOriginFilterMessageName {
return nil, fmt.Errorf("expected type url %q, received %q", EventOriginFilterMessageName, message.TypeUrl)
}
filter := &pbtransform.EventOriginFilter{}
err := proto.Unmarshal(message.Value, filter)
if err != nil {
return nil, fmt.Errorf("unexpected unmarshal error: %w", err)
}
if len(filter.EventOrigins) == 0 {
return nil, fmt.Errorf("event origin filter requires at least one event origin")
}
eventOriginMap := make(map[EventOrigin]bool)
for _, acc := range filter.EventOrigins {
eventOriginMap[EventOrigin(acc)] = true
}
return &EventOriginFilter{
EventOrigins: eventOriginMap,
possibleIndexSizes: possibleIndexSizes,
indexStore: indexStore,
}, nil
},
}
}
type EventOriginFilter struct {
EventOrigins map[EventOrigin]bool
indexStore dstore.Store
possibleIndexSizes []uint64
}
func (p *EventOriginFilter) String() string {
return fmt.Sprintf("%v", p.EventOrigins)
}
func (p *EventOriginFilter) Transform(readOnlyBlk *bstream.Block, in transform.Input) (transform.Output, error) {
block := readOnlyBlk.ToProtocol().(*pbcosmos.Block)
// if filter doesn't pass these Event Origins, nullify the objects in the block
if !p.EventOrigins[BeginBlock] {
block.ResultBeginBlock.Events = []*pbcosmos.Event{}
}
if !p.EventOrigins[EndBlock] {
block.ResultEndBlock.Events = []*pbcosmos.Event{}
}
if !p.EventOrigins[DeliverTx] {
for _, tx := range block.Transactions {
tx.Result.Events = []*pbcosmos.Event{}
}
}
return block, nil
}
func (p *EventOriginFilter) GetIndexProvider() bstream.BlockIndexProvider {
if p.indexStore == nil {
return nil
}
if len(p.EventOrigins) == 0 {
return nil
}
return NewEventOriginIndexProvider(
p.indexStore,
p.possibleIndexSizes,
p.EventOrigins,
)
}