add it (#13865)

Author: nisdas

config/features/config.go

@@ -74,6 +74,8 @@ type Flags struct {
 	PrepareAllPayloads bool // PrepareAllPayloads informs the engine to prepare a block on every slot.
 	// BlobSaveFsync requires blob saving to block on fsync to ensure blobs are durably persisted before passing DA.
 	BlobSaveFsync bool
+	// EnablePeerDAS enables running the node with the experimental data availability sampling scheme.
+	EnablePeerDAS bool
 
 	SaveInvalidBlock bool // SaveInvalidBlock saves invalid block to temp.
 	SaveInvalidBlob  bool // SaveInvalidBlob saves invalid blob to temp.
@@ -259,6 +261,12 @@ func ConfigureBeaconChain(ctx *cli.Context) error {
 		logEnabled(EnableCommitteeAwarePacking)
 		cfg.EnableCommitteeAwarePacking = true
 	}
+	// For the p.o.c we enable it by default.
+	cfg.EnablePeerDAS = true
+	if ctx.IsSet(EnablePeerDAS.Name) {
+		logEnabled(EnablePeerDAS)
+		cfg.EnablePeerDAS = true
+	}
 
 	cfg.AggregateIntervals = [3]time.Duration{aggregateFirstInterval.Value, aggregateSecondInterval.Value, aggregateThirdInterval.Value}
 	Init(cfg)

config/features/flags.go

@@ -170,6 +170,10 @@ var (
 		Name:  "enable-committee-aware-packing",
 		Usage: "Changes the attestation packing algorithm to one that is aware of attesting committees.",
 	}
+	EnablePeerDAS = &cli.BoolFlag{
+		Name:  "peer-das",
+		Usage: "Enables Prysm to run with the experimental peer data availability sampling scheme.",
+	}
 )
 
 // devModeFlags holds list of flags that are set when development mode is on.
@@ -228,6 +232,7 @@ var BeaconChainFlags = append(deprecatedBeaconFlags, append(deprecatedFlags, []c
 	BlobSaveFsync,
 	EnableQUIC,
 	EnableCommitteeAwarePacking,
+	EnablePeerDAS,
 }...)...)
 
 // E2EBeaconChainFlags contains a list of the beacon chain feature flags to be tested in E2E.