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Merge pull request #16 from EspressoSystems/hotshot-client
Implement HotShot commitment reader
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| package arbnode | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "math/big" | ||
|
|
||
| "github.com/ethereum/go-ethereum/accounts/abi/bind" | ||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/offchainlabs/nitro/arbos/espresso" | ||
| "github.com/offchainlabs/nitro/arbos/espresso/hotshot" | ||
| ) | ||
|
|
||
| type HotShotReader struct { | ||
| HotShot hotshot.Hotshot | ||
| } | ||
|
|
||
| func NewHotShotReader(hotShotAddr common.Address, l1client bind.ContractBackend) (*HotShotReader, error) { | ||
| hotshot, err := hotshot.NewHotshot(hotShotAddr, l1client) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &HotShotReader{ | ||
| HotShot: *hotshot, | ||
| }, nil | ||
| } | ||
|
|
||
| // L1HotShotCommitmentFromHeight returns a HotShot commitments to a sequencer block | ||
| // This is used in the derivation pipeline to validate sequencer batches in Espresso mode | ||
| func (h *HotShotReader) L1HotShotCommitmentFromHeight(blockHeight uint64) (*espresso.Commitment, error) { | ||
| var comm espresso.Commitment | ||
| // Check if the requested commitments are even available yet on L1. | ||
| contractBlockHeight, err := h.HotShot.HotshotCaller.BlockHeight(nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if contractBlockHeight.Cmp(big.NewInt(int64(blockHeight))) < 0 { | ||
| return nil, fmt.Errorf("commitment at block height %d is unavailable (current contract block height %d)", blockHeight, contractBlockHeight) | ||
| } | ||
|
|
||
| commAsInt, err := h.HotShot.HotshotCaller.Commitments(nil, big.NewInt(int64(blockHeight))) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if commAsInt.Cmp(big.NewInt(0)) == 0 { | ||
| // A commitment of 0 indicates that this commitment hasn't been set yet in the contract. | ||
| // Since we checked the contract block height above, this can only happen if there was | ||
| // a reorg on L1 just now. In this case, return an error rather than reporting | ||
| // definitive commitments. The caller will retry and we will succeed eventually when we | ||
| // manage to get a consistent snapshot of the L1. | ||
| // | ||
| // Note that in all other reorg cases, where the L1 reorgs but we read a nonzero | ||
| // commitment, we are fine, since the HotShot contract will only ever record a single | ||
| // ledger, consistent across all L1 forks, determined by HotShot consensus. The only | ||
| // question is whether the recorded ledger extends far enough for the commitments we're | ||
| // trying to read on the current fork of L1. | ||
| return nil, fmt.Errorf("read 0 for commitment %d at block height %d, this indicates an L1 reorg", blockHeight, contractBlockHeight) | ||
| } | ||
| comm, err = espresso.CommitmentFromUint256(espresso.NewU256().SetBigInt(commAsInt)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &comm, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,19 @@ | ||
| { | ||
| "persistent": { | ||
| "chain": "local" | ||
| }, | ||
| "ws": { | ||
| "addr": "" | ||
| }, | ||
| "http": { | ||
| "addr": "" | ||
| }, | ||
| "validation": { | ||
| "api-auth": true, | ||
| "api-public": false | ||
| }, | ||
| "auth": { | ||
| "jwtsecret": "./config/val_jwt.hex", | ||
| "addr": "0.0.0.0" | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| { | ||
| "parent-chain": { | ||
| "connection": { | ||
| "url": "ws://localhost:8546" | ||
| }, | ||
| "wallet": { | ||
| "account": "0xE46fC174A70D204A737689996F6dA33Ed14e1457", | ||
| "password": "passphrase", | ||
| "pathname": "/Users/ngolub/.arbitrum/local/keystore" | ||
| } | ||
| }, | ||
| "chain": { | ||
| "id": 412346, | ||
| "info-files": [ | ||
| "./config/l2_chain_info.json" | ||
| ] | ||
| }, | ||
| "execution": { | ||
| "sequencer": { | ||
| "enable": false | ||
| } | ||
| }, | ||
| "node": { | ||
| "staker": { | ||
| "dangerous": { | ||
| "without-block-validator": false | ||
| }, | ||
| "disable-challenge": false, | ||
| "enable": true, | ||
| "staker-interval": "10s", | ||
| "make-assertion-interval": "10s", | ||
| "strategy": "MakeNodes", | ||
| "use-smart-contract-wallet": true | ||
| }, | ||
| "sequencer": false, | ||
| "delayed-sequencer": { | ||
| "enable": false | ||
| }, | ||
| "seq-coordinator": { | ||
| "enable": false, | ||
| "redis-url": "redis://localhost:6379", | ||
| "lockout-duration": "30s", | ||
| "lockout-spare": "1s", | ||
| "my-url": "", | ||
| "retry-interval": "0.5s", | ||
| "seq-num-duration": "24h0m0s", | ||
| "update-interval": "3s" | ||
| }, | ||
| "batch-poster": { | ||
| "enable": false, | ||
| "redis-url": "redis://localhost:6379", | ||
| "max-delay": "30s", | ||
| "data-poster": { | ||
| "redis-signer": { | ||
| "signing-key": "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef" | ||
| }, | ||
| "wait-for-l1-finality": false | ||
| } | ||
| }, | ||
| "block-validator": { | ||
| "validation-server": { | ||
| "url": "ws://localhost:8949", | ||
| "jwtsecret": "./config/val_jwt.hex" | ||
| }, | ||
| "hotshot-address": "0x217788c286797d56cd59af5e493f3699c39cbbe8", | ||
| "espresso": true | ||
| } | ||
| }, | ||
| "persistent": { | ||
| "chain": "local" | ||
| }, | ||
| "ws": { | ||
| "addr": "0.0.0.0" | ||
| }, | ||
| "http": { | ||
| "addr": "0.0.0.0", | ||
| "vhosts": "*", | ||
| "corsdomain": "*" | ||
| } | ||
| } |
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