Rename broadcast validation to broadcast mode and add docs (#506)

* Rename broadcast validation to broadcast mode and add docs * Update beaconclient/multi_beacon_client.go Co-authored-by: Justin Traglia <95511699+jtraglia@users.noreply.github.com> --------- Co-authored-by: Justin Traglia <95511699+jtraglia@users.noreply.github.com>
flashbots · Aug 11, 2023 · aa79e44 · aa79e44
1 parent b709583
commit aa79e44
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Showing 5 changed files with 27 additions and 24 deletions.
diff --git a/README.md b/README.md
@@ -43,10 +43,11 @@ The relay consists of three main components, which are designed to run and scale
 
 - The relay services need access to one or more beacon node for event subscriptions (in particular the `head` and `payload_attributes` topics).
 - You can specify multiple beacon nodes by providing a comma separated list of beacon node URIs.
-- The beacon nodes need to support the []`payload_attributes` SSE event](https://github.com/ethereum/beacon-APIs/pull/305).
+- The beacon nodes need to support the [`payload_attributes` SSE event](https://github.com/ethereum/beacon-APIs/pull/305).
+- Support the [v2 publish block endpoint](https://github.com/ethereum/beacon-APIs/pull/317)
 - As of now, this is either:
-  - **Lighthouse+** (with `--always-prepare-payload` and `--prepare-payload-lookahead 12000` flags, and some junk feeRecipeint), with the [validate-before-broadcast patch](https://github.com/sigp/lighthouse/pull/4168). Here's a [quick guide](https://gist.github.com/metachris/bcae9ae42e2fc834804241f991351c4e) for setting up Lighthouse.
-  - **Prysm** with the [validate-before-broadcast patch](https://github.com/prysmaticlabs/prysm/pull/12335)
+  - **Lighthouse+** [v4.3.0](https://github.com/sigp/lighthouse/releases) or later. Here's a [quick guide](https://gist.github.com/metachris/bcae9ae42e2fc834804241f991351c4e) for setting up Lighthouse.
+  - **Prysm** [v4.0.6](https://github.com/prysmaticlabs/prysm/releases) or later.
 
 **Relays are strongly advised to run multiple beacon nodes!**
 * The reason is that on getPayload, the block has to be validated and broadcast by a local beacon node before it is returned to the proposer.
@@ -129,6 +130,7 @@ redis-cli DEL boost-relay/sepolia:validators-registration boost-relay/sepolia:va
 * `API_SHUTDOWN_STOP_SENDING_BIDS` - whether API should stop sending bids during shutdown (nly useful in single-instance/testnet setups, default: `false`)
 * `BLOCKSIM_MAX_CONCURRENT` - maximum number of concurrent block-sim requests (0 for no maximum, default: `4`)
 * `BLOCKSIM_TIMEOUT_MS` - builder block submission validation request timeout (default: `3000`)
+* `BROADCAST_MODE` - which broadcast mode to use for block publishing (default: `consensus_and_equivocation`)
 * `DB_DONT_APPLY_SCHEMA` - disable applying DB schema on startup (useful for connecting data API to read-only replica)
 * `DB_TABLE_PREFIX` - prefix to use for db tables (default uses `dev`)
 * `GETPAYLOAD_RETRY_TIMEOUT_MS` - getPayload retry getting a payload if first try failed (default: `100`)

diff --git a/beaconclient/mock_beacon_instance.go b/beaconclient/mock_beacon_instance.go
@@ -107,7 +107,7 @@ func (c *MockBeaconInstance) addDelay() {
 	}
 }
 
-func (c *MockBeaconInstance) PublishBlock(block *common.SignedBeaconBlock, broadcastValidation BroadcastValidation) (code int, err error) {
+func (c *MockBeaconInstance) PublishBlock(block *common.SignedBeaconBlock, broadcaseMode BroadcastMode) (code int, err error) {
 	return 0, nil
 }
 

diff --git a/beaconclient/multi_beacon_client.go b/beaconclient/multi_beacon_client.go
@@ -20,15 +20,15 @@ var (
 	ErrBeaconBlock202           = errors.New("beacon block failed validation but was still broadcast (202)")
 )
 
-type BroadcastValidation int
+type BroadcastMode int
 
 const (
-	Gossip                   BroadcastValidation = iota // lightweight gossip checks only
-	Consensus                                           // full consensus checks, including validation of all signatures and blocks fields
-	ConsensusAndEquivocation                            // the same as `consensus`, with an extra equivocation check
+	Gossip                   BroadcastMode = iota // lightweight gossip checks only
+	Consensus                                     // full consensus checks, including validation of all signatures and blocks fields
+	ConsensusAndEquivocation                      // the same as `consensus`, with an extra equivocation check
 )
 
-func (b BroadcastValidation) String() string {
+func (b BroadcastMode) String() string {
 	return [...]string{"gossip", "consensus", "consensus_and_equivocation"}[b]
 }
 
@@ -60,7 +60,7 @@ type IBeaconInstance interface {
 	GetStateValidators(stateID string) (*GetStateValidatorsResponse, error)
 	GetProposerDuties(epoch uint64) (*ProposerDutiesResponse, error)
 	GetURI() string
-	PublishBlock(block *common.SignedBeaconBlock, broadcastValidation BroadcastValidation) (code int, err error)
+	PublishBlock(block *common.SignedBeaconBlock, broadcastMode BroadcastMode) (code int, err error)
 	GetGenesis() (*GetGenesisResponse, error)
 	GetSpec() (spec *GetSpecResponse, err error)
 	GetForkSchedule() (spec *GetForkScheduleResponse, err error)
@@ -76,7 +76,8 @@ type MultiBeaconClient struct {
 
 	// feature flags
 	ffAllowSyncingBeaconNode bool
-	ffBroadcastValidation    BroadcastValidation
+
+	broadcastMode BroadcastMode
 }
 
 func NewMultiBeaconClient(log *logrus.Entry, beaconInstances []IBeaconInstance) *MultiBeaconClient {
@@ -85,7 +86,7 @@ func NewMultiBeaconClient(log *logrus.Entry, beaconInstances []IBeaconInstance)
 		beaconInstances:          beaconInstances,
 		bestBeaconIndex:          *uberatomic.NewInt64(0),
 		ffAllowSyncingBeaconNode: false,
-		ffBroadcastValidation:    ConsensusAndEquivocation,
+		broadcastMode:            ConsensusAndEquivocation,
 	}
 
 	// feature flags
@@ -94,15 +95,15 @@ func NewMultiBeaconClient(log *logrus.Entry, beaconInstances []IBeaconInstance)
 		client.ffAllowSyncingBeaconNode = true
 	}
 
-	if os.Getenv("BROADCAST_VALIDATION") != "" {
-		broadcastValidationStr := os.Getenv("BROADCAST_VALIDATION")
-		broadcastValidation, ok := parseBroadcastValidationString(broadcastValidationStr)
+	broadcastModeStr := os.Getenv("BROADCAST_MODE")
+	if broadcastModeStr != "" {
+		broadcastMode, ok := parseBroadcastModeString(broadcastModeStr)
 		if !ok {
-			msg := fmt.Sprintf("env: BROADCAST_VALIDATION: invalid value %s, leaving to default value %s", broadcastValidationStr, client.ffBroadcastValidation.String())
+			msg := fmt.Sprintf("env: BROADCAST_MODE: invalid value %s, leaving to default value %s", broadcastModeStr, client.broadcastMode.String())
 			client.log.Warn(msg)
 		} else {
-			client.log.Info(fmt.Sprintf("env: BROADCAST_VALIDATION: setting validation to %s", broadcastValidation.String()))
-			client.ffBroadcastValidation = broadcastValidation
+			client.log.Info(fmt.Sprintf("env: BROADCAST_MODE: setting mode to %s", broadcastMode.String()))
+			client.broadcastMode = broadcastMode
 		}
 	}
 
@@ -269,7 +270,7 @@ func (c *MultiBeaconClient) PublishBlock(block *common.SignedBeaconBlock) (code
 		log := log.WithField("uri", client.GetURI())
 		log.Debug("publishing block")
 		go func(index int, client IBeaconInstance) {
-			code, err := client.PublishBlock(block, c.ffBroadcastValidation)
+			code, err := client.PublishBlock(block, c.broadcastMode)
 			resChans <- publishResp{
 				index: index,
 				code:  code,

diff --git a/beaconclient/prod_beacon_instance.go b/beaconclient/prod_beacon_instance.go
@@ -256,8 +256,8 @@ func (c *ProdBeaconInstance) GetURI() string {
 	return c.beaconURI
 }
 
-func (c *ProdBeaconInstance) PublishBlock(block *common.SignedBeaconBlock, broadcastValidation BroadcastValidation) (code int, err error) {
-	uri := fmt.Sprintf("%s/eth/v2/beacon/blocks?broadcast_validation=%s", c.beaconURI, broadcastValidation.String())
+func (c *ProdBeaconInstance) PublishBlock(block *common.SignedBeaconBlock, broadcastMode BroadcastMode) (code int, err error) {
+	uri := fmt.Sprintf("%s/eth/v2/beacon/blocks?broadcast_validation=%s", c.beaconURI, broadcastMode.String())
 	headers := http.Header{}
 	headers.Add("Eth-Consensus-Version", common.ForkVersionStringCapella)
 	return fetchBeacon(http.MethodPost, uri, block, nil, nil, headers)

diff --git a/beaconclient/util.go b/beaconclient/util.go
@@ -20,13 +20,13 @@ var (
 	StateIDJustified = "justified"
 )
 
-func parseBroadcastValidationString(s string) (BroadcastValidation, bool) {
-	broadcastValidationMap := map[string]BroadcastValidation{
+func parseBroadcastModeString(s string) (BroadcastMode, bool) {
+	broadcastModeMap := map[string]BroadcastMode{
 		"gossip":                     Gossip,
 		"consensus":                  Consensus,
 		"consensus_and_equivocation": ConsensusAndEquivocation,
 	}
-	b, ok := broadcastValidationMap[strings.ToLower(s)]
+	b, ok := broadcastModeMap[strings.ToLower(s)]
 	return b, ok
 }