/
event_handler.go
51 lines (43 loc) · 1.61 KB
/
event_handler.go
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package chaincode
import (
"github.com/hyperledger/fabric-contract-api-go/contractapi"
abci "github.com/tendermint/tendermint/abci/types"
)
// EventHandler defines the interface of handling the events of application
type EventHandler interface {
Handle(ctx contractapi.TransactionContextInterface, events []abci.Event) (continue_ bool, err error)
}
// DefaultMultiEventHandler returns a handler which satisfies minimum requirements
func DefaultMultiEventHandler() MultiEventHandler {
return NewMultiEventHandler(
EventHandlerFunc(HandlePacketEvent),
EventHandlerFunc(HandlePacketAcknowledgementEvent),
)
}
// EventHandlerFunc is a function type which handles application events
type EventHandlerFunc func(ctx contractapi.TransactionContextInterface, events []abci.Event) (continue_ bool, err error)
// Handle implements EventHandler.Handle
func (f EventHandlerFunc) Handle(ctx contractapi.TransactionContextInterface, events []abci.Event) (continue_ bool, err error) {
return f(ctx, events)
}
// MultiEventHandler is a handler which handles application events by multiple handlers
type MultiEventHandler struct {
hs []EventHandler
}
// NewMultiEventHandler creates a instance of MultiEventHandler
func NewMultiEventHandler(handlers ...EventHandler) MultiEventHandler {
return MultiEventHandler{hs: handlers}
}
// Handle handles a given events by multiple handlers
func (mh MultiEventHandler) Handle(ctx contractapi.TransactionContextInterface, events []abci.Event) error {
for _, h := range mh.hs {
continue_, err := h.Handle(ctx, events)
if err != nil {
return err
}
if !continue_ {
return nil
}
}
return nil
}