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subscription.go
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subscription.go
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// Copyright 2022 Evmos Foundation
// This file is part of the Evmos Network packages.
//
// Evmos is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The Evmos packages are distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the Evmos packages. If not, see https://github.com/evmos/evmos/blob/main/LICENSE
package filters
import (
"time"
"github.com/ethereum/go-ethereum/common"
ethtypes "github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/eth/filters"
"github.com/ethereum/go-ethereum/rpc"
coretypes "github.com/tendermint/tendermint/rpc/core/types"
)
// Subscription defines a wrapper for the private subscription
type Subscription struct {
id rpc.ID
typ filters.Type
event string
created time.Time
logsCrit filters.FilterCriteria
logs chan []*ethtypes.Log
hashes chan []common.Hash
headers chan *ethtypes.Header
installed chan struct{} // closed when the filter is installed
eventCh <-chan coretypes.ResultEvent
err chan error
}
// ID returns the underlying subscription RPC identifier.
func (s Subscription) ID() rpc.ID {
return s.id
}
// Unsubscribe from the current subscription to Tendermint Websocket. It sends an error to the
// subscription error channel if unsubscribe fails.
func (s *Subscription) Unsubscribe(es *EventSystem) {
go func() {
uninstallLoop:
for {
// write uninstall request and consume logs/hashes. This prevents
// the eventLoop broadcast method to deadlock when writing to the
// filter event channel while the subscription loop is waiting for
// this method to return (and thus not reading these events).
select {
case es.uninstall <- s:
break uninstallLoop
case <-s.logs:
case <-s.hashes:
case <-s.headers:
}
}
}()
}
// Err returns the error channel
func (s *Subscription) Err() <-chan error {
return s.err
}
// Event returns the tendermint result event channel
func (s *Subscription) Event() <-chan coretypes.ResultEvent {
return s.eventCh
}