feat: add ChainProposedLength into the manifest (#788)

* feat: add ChainProposedLength into the manifest

Signed-off-by: Jakub Sztandera <oss@kubuxu.com>

* Separate out max length and defualt length

Increase max length to 128 to line up with merke tree size

Signed-off-by: Jakub Sztandera <oss@kubuxu.com>

* fix manifest test

Signed-off-by: Jakub Sztandera <oss@kubuxu.com>

* Change ChainMaxLen to 128

Signed-off-by: Jakub Sztandera <oss@kubuxu.com>

---------

Signed-off-by: Jakub Sztandera <oss@kubuxu.com>

consensus_inputs.go

@@ -151,7 +151,8 @@ func (h *gpbftInputs) GetProposal(ctx context.Context, instance uint64) (_ *gpbf
 		return nil, nil, fmt.Errorf("computing powertable CID for base: %w", err)
 	}
 
-	suffix := make([]gpbft.TipSet, min(gpbft.ChainMaxLen-1, len(collectedChain))) // -1 because of base
+	suffixLen := min(gpbft.ChainMaxLen, h.manifest.Gpbft.ChainProposedLength) - 1 // -1 because of base
+	suffix := make([]gpbft.TipSet, min(suffixLen, len(collectedChain)))
 	for i := range suffix {
 		suffix[i].Key = collectedChain[i].Key()
 		suffix[i].Epoch = collectedChain[i].Epoch()

f3_test.go

@@ -239,7 +239,7 @@ func TestF3LateBootstrap(t *testing.T) {
 	env := newTestEnvironment(t).withNodes(2).start()
 
 	// Wait till we're "caught up".
-	bootstrapInstances := uint64(env.manifest.EC.Finality/(gpbft.ChainMaxLen-1)) + 1
+	bootstrapInstances := uint64(env.manifest.EC.Finality/(gpbft.ChainDefaultLen-1)) + 1
 	env.waitForInstanceNumber(bootstrapInstances, 30*time.Second, true)
 
 	// Wait until we've finalized a distant epoch. Once we do, our EC will forget the historical

gpbft/chain.go

@@ -21,7 +21,9 @@ const (
 	// CidMaxLen specifies the maximum length of a CID.
 	CidMaxLen = 38
 	// ChainMaxLen specifies the maximum length of a chain value.
-	ChainMaxLen = 100
+	ChainMaxLen = 128
+	// ChainDefaultLen specifies the default length of chain value.
+	ChainDefaultLen = 100
 	// TipsetKeyMaxLen specifies the maximum length of a tipset. The max size is
 	// chosen such that it allows ample space for an impossibly-unlikely number of
 	// blocks in a tipset, while maintaining a practical limit to prevent abuse.

internal/powerstore/powerstore_test.go

@@ -201,7 +201,7 @@ func advanceF3(t *testing.T, m *manifest.Manifest, ps *powerstore.Store, cs *cer
 	basePt, err := cs.GetPowerTable(ctx, instance)
 	require.NoError(t, err)
 	for len(gpbftChain) > 1 {
-		count := min(len(gpbftChain), rand.IntN(epochsPerCert+1)+1, gpbft.ChainMaxLen)
+		count := min(len(gpbftChain), rand.IntN(epochsPerCert+1)+1, gpbft.ChainDefaultLen)
 		newChain := gpbftChain[:count]
 
 		nextPt := basePt

manifest/manifest.go

@@ -34,6 +34,7 @@ var (
 		Delta:                      6 * time.Second,
 		DeltaBackOffExponent:       2.0,
 		MaxLookaheadRounds:         5,
+		ChainProposedLength:        gpbft.ChainDefaultLen,
 		RebroadcastBackoffBase:     6 * time.Second,
 		RebroadcastBackoffSpread:   0.1,
 		RebroadcastBackoffExponent: 1.3,
@@ -93,6 +94,8 @@ type GpbftConfig struct {
 	DeltaBackOffExponent float64
 	MaxLookaheadRounds   uint64
 
+	ChainProposedLength int
+
 	RebroadcastBackoffBase     time.Duration
 	RebroadcastBackoffExponent float64
 	RebroadcastBackoffSpread   float64
@@ -107,6 +110,11 @@ func (g *GpbftConfig) Validate() error {
 		return fmt.Errorf("GPBFT backoff exponent must be at least 1.0, was %f", g.DeltaBackOffExponent)
 	}
 
+	if g.ChainProposedLength < 1 {
+		return fmt.Errorf("GPBFT proposed chain length cannot be less than 1")
+	}
+	// not checking against gpbft.ChainMaxLen, it is handled gracefully
+
 	if g.RebroadcastBackoffBase <= 0 {
 		return fmt.Errorf("GPBFT rebroadcast backoff base must be greater than 0, was %s",
 			g.RebroadcastBackoffBase)

manifest/manifest_test.go

@@ -31,6 +31,7 @@ var base = manifest.Manifest{
 		Delta:                      10,
 		DeltaBackOffExponent:       1.2,
 		MaxLookaheadRounds:         5,
+		ChainProposedLength:        gpbft.ChainDefaultLen,
 		RebroadcastBackoffBase:     10,
 		RebroadcastBackoffExponent: 1.3,
 		RebroadcastBackoffMax:      30,