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Merge pull request #110 from EspressoSystems/jh/escape-hatch
Add SwitchSequencer
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,160 @@ | ||
| package gethexec | ||
|
|
||
| import ( | ||
| "context" | ||
| "time" | ||
|
|
||
| lightClient "github.com/EspressoSystems/espresso-sequencer-go/light-client" | ||
| "github.com/ethereum/go-ethereum/accounts/abi/bind" | ||
| "github.com/ethereum/go-ethereum/arbitrum_types" | ||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/core/types" | ||
| "github.com/ethereum/go-ethereum/log" | ||
| "github.com/offchainlabs/nitro/arbos" | ||
| "github.com/offchainlabs/nitro/util/stopwaiter" | ||
| ) | ||
|
|
||
| const ( | ||
| SequencingMode_Espresso = 0 | ||
| SequencingMode_Centralized = 1 | ||
| ) | ||
|
|
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| type SwitchSequencer struct { | ||
| stopwaiter.StopWaiter | ||
|
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| centralized *Sequencer | ||
| espresso *EspressoSequencer | ||
|
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| maxHotShotDriftTime time.Duration | ||
| switchPollInterval time.Duration | ||
| lightClient lightClient.LightClientReaderInterface | ||
|
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| mode int | ||
| } | ||
|
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| func NewSwitchSequencer(centralized *Sequencer, espresso *EspressoSequencer, l1client bind.ContractBackend, configFetcher SequencerConfigFetcher) (*SwitchSequencer, error) { | ||
| config := configFetcher() | ||
| err := config.Validate() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| var lightClient lightClient.LightClientReaderInterface | ||
| if config.LightClientAddress != "" { | ||
| lightClient, err = arbos.NewMockLightClientReader(common.HexToAddress(config.LightClientAddress), l1client) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
|
|
||
| return &SwitchSequencer{ | ||
| centralized: centralized, | ||
| espresso: espresso, | ||
| lightClient: lightClient, | ||
| mode: SequencingMode_Espresso, | ||
| maxHotShotDriftTime: config.MaxHotShotDriftTime, | ||
| switchPollInterval: config.SwitchPollInterval, | ||
| }, nil | ||
| } | ||
|
|
||
| func (s *SwitchSequencer) IsRunningEspressoMode() bool { | ||
| return s.mode == SequencingMode_Espresso | ||
| } | ||
|
|
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| func (s *SwitchSequencer) SwitchToEspresso(ctx context.Context) error { | ||
| if s.IsRunningEspressoMode() { | ||
| return nil | ||
| } | ||
| log.Info("Switching to espresso sequencer") | ||
|
|
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| s.mode = SequencingMode_Espresso | ||
|
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| s.centralized.StopAndWait() | ||
| return s.espresso.Start(ctx) | ||
| } | ||
|
|
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| func (s *SwitchSequencer) SwitchToCentralized(ctx context.Context) error { | ||
| if !s.IsRunningEspressoMode() { | ||
| return nil | ||
| } | ||
| s.mode = SequencingMode_Centralized | ||
| log.Info("Switching to centrialized sequencer") | ||
|
|
||
| s.espresso.StopAndWait() | ||
| return s.centralized.Start(ctx) | ||
| } | ||
|
|
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| func (s *SwitchSequencer) getRunningSequencer() TransactionPublisher { | ||
| if s.IsRunningEspressoMode() { | ||
| return s.espresso | ||
| } | ||
| return s.centralized | ||
| } | ||
|
|
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| func (s *SwitchSequencer) PublishTransaction(ctx context.Context, tx *types.Transaction, options *arbitrum_types.ConditionalOptions) error { | ||
| return s.getRunningSequencer().PublishTransaction(ctx, tx, options) | ||
| } | ||
|
|
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| func (s *SwitchSequencer) CheckHealth(ctx context.Context) error { | ||
| return s.getRunningSequencer().CheckHealth(ctx) | ||
| } | ||
|
|
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| func (s *SwitchSequencer) Initialize(ctx context.Context) error { | ||
| err := s.centralized.Initialize(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| return s.espresso.Initialize(ctx) | ||
| } | ||
|
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| func (s *SwitchSequencer) Start(ctx context.Context) error { | ||
| s.StopWaiter.Start(ctx, s) | ||
| err := s.getRunningSequencer().Start(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if s.lightClient != nil { | ||
| s.CallIteratively(func(ctx context.Context) time.Duration { | ||
| espresso := s.lightClient.IsHotShotAvaliable(s.maxHotShotDriftTime) | ||
|
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| var err error | ||
| if s.IsRunningEspressoMode() && !espresso { | ||
| err = s.SwitchToCentralized(ctx) | ||
| } else if !s.IsRunningEspressoMode() && espresso { | ||
| err = s.SwitchToEspresso(ctx) | ||
| } | ||
|
|
||
| if err != nil { | ||
| return 0 | ||
| } | ||
| return s.switchPollInterval | ||
| }) | ||
| } | ||
|
|
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| return nil | ||
| } | ||
|
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| func (s *SwitchSequencer) StopAndWait() { | ||
| s.getRunningSequencer().StopAndWait() | ||
| s.StopWaiter.StopAndWait() | ||
| } | ||
|
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| func (s *SwitchSequencer) Started() bool { | ||
| return s.getRunningSequencer().Started() | ||
| } | ||
|
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| func (s *SwitchSequencer) SetMode(ctx context.Context, m bool) error { | ||
| if m { | ||
| return s.SwitchToEspresso(ctx) | ||
| } else { | ||
| return s.SwitchToCentralized(ctx) | ||
| } | ||
| } | ||
|
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| func (s *Sequencer) SetMode(ctx context.Context, espresso bool) error { return nil } | ||
| func (s *EspressoSequencer) SetMode(ctx context.Context, m bool) error { return nil } | ||
| func (s *RedisTxForwarder) SetMode(ctx context.Context, m bool) error { return nil } | ||
| func (s *TxDropper) SetMode(ctx context.Context, m bool) error { return nil } | ||
| func (s *TxForwarder) SetMode(ctx context.Context, m bool) error { return nil } |
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