69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
package connectors
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import (
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"context"
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"errors"
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"math/big"
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"sync"
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"github.com/certusone/wormhole/node/pkg/watchers/evm/connectors/ethabi"
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"github.com/ethereum/go-ethereum"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/event"
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)
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type NewBlock struct {
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Number *big.Int
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Hash common.Hash
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L1BlockNumber *big.Int // This is only populated on some chains (Arbitrum)
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Safe bool
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}
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// Connector exposes Wormhole-specific interactions with an EVM-based network
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type Connector interface {
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NetworkName() string
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ContractAddress() common.Address
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GetCurrentGuardianSetIndex(ctx context.Context) (uint32, error)
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GetGuardianSet(ctx context.Context, index uint32) (ethabi.StructsGuardianSet, error)
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WatchLogMessagePublished(ctx context.Context, sink chan<- *ethabi.AbiLogMessagePublished) (event.Subscription, error)
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TransactionReceipt(ctx context.Context, txHash common.Hash) (*types.Receipt, error)
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TimeOfBlockByHash(ctx context.Context, hash common.Hash) (uint64, error)
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ParseLogMessagePublished(log types.Log) (*ethabi.AbiLogMessagePublished, error)
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SubscribeForBlocks(ctx context.Context, sink chan<- *NewBlock) (ethereum.Subscription, error)
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RawCallContext(ctx context.Context, result interface{}, method string, args ...interface{}) error
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}
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type PollSubscription struct {
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errOnce sync.Once
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err chan error
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quit chan error
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unsubDone chan struct{}
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}
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func NewPollSubscription() *PollSubscription {
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return &PollSubscription{
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err: make(chan error, 1),
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quit: make(chan error, 1),
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unsubDone: make(chan struct{}, 1),
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}
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}
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var ErrUnsubscribed = errors.New("unsubscribed")
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func (sub *PollSubscription) Err() <-chan error {
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return sub.err
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}
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func (sub *PollSubscription) Unsubscribe() {
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sub.errOnce.Do(func() {
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select {
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case sub.quit <- ErrUnsubscribed:
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<-sub.unsubDone
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case <-sub.unsubDone:
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}
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close(sub.err)
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})
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}
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