Support more than u8::max_value GRANDPA validators (paritytech#896)

* Support moar validators.

* Update weights script.

* Use correct type for benchmarking accounts

* Use package name instead of manifest path

Co-authored-by: Hernando Castano <hernando@hcastano.com>

bridges/modules/grandpa/src/benchmarking.rs

@@ -64,9 +64,7 @@ const MAX_VOTE_ANCESTRIES: u32 = 1000;
 
 // The maximum number of pre-commits to include in a justification. In practice this scales with the
 // number of validators.
-//
-// TODO [#846]: Right now this will break benchmarking if it is greater than `u8::MAX`
-const MAX_VALIDATOR_SET_SIZE: u32 = 255;
+const MAX_VALIDATOR_SET_SIZE: u32 = 1024;
 
 benchmarks_instance_pallet! {
 	// This is the "gold standard" benchmark for this extrinsic, and it's what should be used to
@@ -80,7 +78,7 @@ benchmarks_instance_pallet! {
 
 		let caller: T::AccountId = whitelisted_caller();
 
-		let authority_list = accounts(p as u8)
+		let authority_list = accounts(p as u16)
 			.iter()
 			.map(|id| (AuthorityId::from(*id), 1))
 			.collect::<Vec<_>>();
@@ -99,7 +97,7 @@ benchmarks_instance_pallet! {
 			header: header.clone(),
 			round: TEST_GRANDPA_ROUND,
 			set_id: TEST_GRANDPA_SET_ID,
-			authorities: accounts(p as u8).iter().map(|k| (*k, 1)).collect::<Vec<_>>(),
+			authorities: accounts(p as u16).iter().map(|k| (*k, 1)).collect::<Vec<_>>(),
 			votes: v,
 			forks: 1,
 		};
@@ -160,7 +158,7 @@ benchmarks_instance_pallet! {
 
 		let caller: T::AccountId = whitelisted_caller();
 
-		let authority_list = accounts(p as u8)
+		let authority_list = accounts(p as u16)
 			.iter()
 			.map(|id| (AuthorityId::from(*id), 1))
 			.collect::<Vec<_>>();
@@ -179,7 +177,7 @@ benchmarks_instance_pallet! {
 			header: header.clone(),
 			round: TEST_GRANDPA_ROUND,
 			set_id: TEST_GRANDPA_SET_ID,
-			authorities: accounts(p as u8).iter().map(|k| (*k, 1)).collect::<Vec<_>>(),
+			authorities: accounts(p as u16).iter().map(|k| (*k, 1)).collect::<Vec<_>>(),
 			votes: p,
 			forks: p,
 		};

bridges/primitives/test-utils/Cargo.toml

@@ -9,19 +9,21 @@ license = "GPL-3.0-or-later WITH Classpath-exception-2.0"
 bp-header-chain = { path = "../header-chain", default-features = false  }
 ed25519-dalek = { version = "1.0", default-features = false, features = ["u64_backend"] }
 finality-grandpa = { version = "0.14.0", default-features = false }
+parity-scale-codec = { version = "2.0.0", default-features = false }
+sp-application-crypto = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-finality-grandpa = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false  }
 sp-runtime = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-std = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
-sp-application-crypto = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 
 [features]
 default = ["std"]
 std = [
 	"bp-header-chain/std",
 	"ed25519-dalek/std",
 	"finality-grandpa/std",
+	"parity-scale-codec/std",
+	"sp-application-crypto/std",
 	"sp-finality-grandpa/std",
 	"sp-runtime/std",
 	"sp-std/std",
-	"sp-application-crypto/std",
 ]

bridges/primitives/test-utils/src/keyring.rs

@@ -18,6 +18,7 @@
 
 use ed25519_dalek::{Keypair, PublicKey, SecretKey, Signature};
 use finality_grandpa::voter_set::VoterSet;
+use parity_scale_codec::Encode;
 use sp_application_crypto::Public;
 use sp_finality_grandpa::{AuthorityId, AuthorityList, AuthorityWeight};
 use sp_runtime::RuntimeDebug;
@@ -33,15 +34,18 @@ pub const FERDIE: Account = Account(5);
 
 /// A test account which can be used to sign messages.
 #[derive(RuntimeDebug, Clone, Copy)]
-pub struct Account(pub u8);
+pub struct Account(pub u16);
 
 impl Account {
 	pub fn public(&self) -> PublicKey {
 		(&self.secret()).into()
 	}
 
 	pub fn secret(&self) -> SecretKey {
-		SecretKey::from_bytes(&[self.0; 32]).expect("A static array of the correct length is a known good.")
+		let data = self.0.encode();
+		let mut bytes = [0_u8; 32];
+		bytes[0..data.len()].copy_from_slice(&*data);
+		SecretKey::from_bytes(&bytes).expect("A static array of the correct length is a known good.")
 	}
 
 	pub fn pair(&self) -> Keypair {
@@ -87,6 +91,6 @@ pub fn test_keyring() -> Vec<(Account, AuthorityWeight)> {
 }
 
 /// Get a list of "unique" accounts.
-pub fn accounts(len: u8) -> Vec<Account> {
+pub fn accounts(len: u16) -> Vec<Account> {
 	(0..len).into_iter().map(Account).collect()
 }