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redelegation.go
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redelegation.go
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package delegation
// TODO_TECHDEBT(#280): Refactor to use merged observables and subscribe to
// MsgDelegateToGateway and MsgUndelegateFromGateway messages directly, instead
// of listening to all events and doing a verbose filter.
import (
"strconv"
"github.com/pokt-network/poktroll/pkg/client"
"github.com/pokt-network/poktroll/pkg/client/events"
"github.com/pokt-network/poktroll/pkg/client/tx"
)
// redelegationEventType is the type of the EventRedelegation event emitted by
// both the MsgDelegateToGateway and MsgUndelegateFromGateway messages.
const redelegationEventType = "poktroll.application.EventRedelegation"
var _ client.Redelegation = (*redelegation)(nil)
// redelegation wraps the EventRedelegation event emitted by the application
// module, for use in the observable, it is one of the log entries embedded
// within the log field of the response struct from the app module's query.
type redelegation struct {
AppAddress string `json:"app_address"`
GatewayAddress string `json:"gateway_address"`
}
// GetAppAddress returns the application address of the redelegation event
func (d redelegation) GetAppAddress() string {
return d.AppAddress
}
// GetGatewayAddress returns the gateway address of the redelegation event
func (d redelegation) GetGatewayAddress() string {
return d.GatewayAddress
}
// newRedelegationEventFactoryFn is a factory function that returns a
// function that attempts to deserialize the given bytes into a redelegation
// struct. If the delegate struct has an empty app address then an
// ErrUnmarshalRedelegation error is returned. Otherwise if deserialisation
// fails then the error is returned.
func newRedelegationEventFactoryFn() events.NewEventsFn[client.Redelegation] {
return func(eventBz []byte) (client.Redelegation, error) {
// Try to deserialize the provided bytes into an abci.TxResult.
txResult, err := tx.UnmarshalTxResult(eventBz)
if err != nil {
return nil, err
}
// Iterate through the log entries to find EventRedelegation
for _, event := range txResult.Result.Events {
if event.GetType() != redelegationEventType {
continue
}
var redelegationEvent redelegation
for _, attr := range event.Attributes {
switch attr.Key {
case "app_address":
appAddr, err := unescape(attr.Value)
if err != nil {
return nil, events.ErrEventsUnmarshalEvent.Wrapf("cannot retrieve app address: %v", err)
}
redelegationEvent.AppAddress = appAddr
case "gateway_address":
gatewayAddr, err := unescape(attr.Value)
if err != nil {
return nil, events.ErrEventsUnmarshalEvent.Wrapf("cannot retrieve gateway address: %v", err)
}
redelegationEvent.GatewayAddress = gatewayAddr
}
}
// Handle the redelegation event
if redelegationEvent.AppAddress == "" || redelegationEvent.GatewayAddress == "" {
return nil, events.ErrEventsUnmarshalEvent.
Wrapf("empty redelegation event: %s", string(eventBz))
}
return redelegationEvent, nil
}
return nil, events.ErrEventsUnmarshalEvent.Wrap("no redelegation event found")
}
}
func unescape(s string) (string, error) {
return strconv.Unquote(s)
}