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restructuring parachain commitment relayer into isolated worker (pari…
…tytech#352) * first draft of parachain commitment relayer * refactor updates * rename
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137 changes: 137 additions & 0 deletions
137
relayer/workers/parachaincommitmentrelayer/ethereum-channel-writer.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| package parachaincommitmentrelayer | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
|
|
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| "golang.org/x/sync/errgroup" | ||
|
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| "github.com/ethereum/go-ethereum/accounts/abi/bind" | ||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/core/types" | ||
| "github.com/sirupsen/logrus" | ||
|
|
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| "github.com/snowfork/polkadot-ethereum/relayer/chain" | ||
| "github.com/snowfork/polkadot-ethereum/relayer/chain/ethereum" | ||
| "github.com/snowfork/polkadot-ethereum/relayer/contracts/inbound" | ||
| "github.com/snowfork/polkadot-ethereum/relayer/substrate" | ||
| ) | ||
|
|
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| type EthereumChannelWriter struct { | ||
| config *ethereum.Config | ||
| conn *ethereum.Connection | ||
| contracts map[substrate.ChannelID]*inbound.Contract | ||
| messages <-chan []chain.Message | ||
| log *logrus.Entry | ||
| } | ||
|
|
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| func NewEthereumChannelWriter(config *ethereum.Config, conn *ethereum.Connection, messages <-chan []chain.Message, | ||
| contracts map[substrate.ChannelID]*inbound.Contract, | ||
| log *logrus.Entry) (*EthereumChannelWriter, error) { | ||
| return &EthereumChannelWriter{ | ||
| config: config, | ||
| conn: conn, | ||
| contracts: contracts, | ||
| messages: messages, | ||
| log: log, | ||
| }, nil | ||
| } | ||
|
|
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| func (wr *EthereumChannelWriter) Start(ctx context.Context, eg *errgroup.Group) error { | ||
|
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| id := substrate.ChannelID{IsBasic: true} | ||
| contract, err := inbound.NewContract(common.HexToAddress(wr.config.Channels.Basic.Inbound), wr.conn.GetClient()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| wr.contracts[id] = contract | ||
|
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| id = substrate.ChannelID{IsIncentivized: true} | ||
| contract, err = inbound.NewContract(common.HexToAddress(wr.config.Channels.Incentivized.Inbound), wr.conn.GetClient()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| wr.contracts[id] = contract | ||
|
|
||
| eg.Go(func() error { | ||
| return wr.writeMessagesLoop(ctx) | ||
| }) | ||
|
|
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| return nil | ||
| } | ||
|
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| func (wr *EthereumChannelWriter) onDone(ctx context.Context) error { | ||
| wr.log.Info("Shutting down writer...") | ||
| // Avoid deadlock if a listener is still trying to send to a channel | ||
| for range wr.messages { | ||
| wr.log.Debug("Discarded message") | ||
| } | ||
| return ctx.Err() | ||
| } | ||
|
|
||
| func (wr *EthereumChannelWriter) writeMessagesLoop(ctx context.Context) error { | ||
| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return wr.onDone(ctx) | ||
| case msgs := <-wr.messages: | ||
| for _, msg := range msgs { | ||
| concreteMsg, ok := msg.(chain.SubstrateOutboundMessage) | ||
| if !ok { | ||
| return fmt.Errorf("Invalid message") | ||
| } | ||
|
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| err := wr.WriteChannel(ctx, &concreteMsg) | ||
| if err != nil { | ||
| wr.log.WithError(err).Error("Error submitting message to ethereum") | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| func (wr *EthereumChannelWriter) signerFn(_ common.Address, tx *types.Transaction) (*types.Transaction, error) { | ||
| signedTx, err := types.SignTx(tx, types.HomesteadSigner{}, wr.conn.GetKP().PrivateKey()) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return signedTx, nil | ||
| } | ||
|
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| // Submit sends a SCALE-encoded message to an application deployed on the Ethereum network | ||
| func (wr *EthereumChannelWriter) WriteChannel(ctx context.Context, msg *chain.SubstrateOutboundMessage) error { | ||
| contract := wr.contracts[msg.ChannelID] | ||
| if contract == nil { | ||
| return fmt.Errorf("Unknown contract") | ||
| } | ||
|
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| options := bind.TransactOpts{ | ||
| From: wr.conn.GetKP().CommonAddress(), | ||
| Signer: wr.signerFn, | ||
| Context: ctx, | ||
| GasLimit: 500000, | ||
| } | ||
|
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| var messages []inbound.InboundChannelMessage | ||
| for _, m := range msg.Commitment { | ||
| messages = append(messages, | ||
| inbound.InboundChannelMessage{ | ||
| Target: m.Target, | ||
| Nonce: m.Nonce, | ||
| Payload: m.Payload, | ||
| }, | ||
| ) | ||
| } | ||
|
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| tx, err := contract.Submit(&options, messages, msg.CommitmentHash) | ||
| if err != nil { | ||
| wr.log.WithError(err).Error("Failed to submit transaction") | ||
| return err | ||
| } | ||
|
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| wr.log.WithFields(logrus.Fields{ | ||
| "txHash": tx.Hash().Hex(), | ||
| }).Info("Transaction submitted") | ||
|
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| return nil | ||
| } |
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