Light friendly storage tracking: changes trie + extending over ranges (#628)

* changes_trie

* changs_trie: continue

* changes_trie: adding tests

* fixed TODO

* removed obsolete ExtrinsicChanges

* encodable ChangesTrieConfiguration

* removed polkadot fle

* fixed grumbles

* ext_storage_changes_root returns u32

* moved changes trie root to digest

* removed commented code

* read storage values from native code

* fixed grumbles

* fixed grumbles

* missing comma

substrate/srml/balances/src/genesis_config.rs

@@ -18,13 +18,11 @@
 
 #![cfg(feature = "std")]
 
-use std::collections::HashMap;
 use rstd::prelude::*;
 use codec::Encode;
 use runtime_support::{StorageValue, StorageMap};
 use primitives::traits::{Zero, As};
-use substrate_primitives::Blake2Hasher;
-use {runtime_io, primitives};
+use primitives;
 use super::{Trait, ENUM_SET_SIZE, EnumSet, NextEnumSet, CreationFee, TransferFee,
 	ReclaimRebate, ExistentialDeposit, TransactionByteFee, TransactionBaseFee, TotalIssuance,
 	FreeBalance};
@@ -57,10 +55,10 @@ impl<T: Trait> Default for GenesisConfig<T> {
 }
 
 impl<T: Trait> primitives::BuildStorage for GenesisConfig<T> {
-	fn build_storage(self) -> ::std::result::Result<HashMap<Vec<u8>, Vec<u8>>, String> {
+	fn build_storage(self) -> ::std::result::Result<primitives::StorageMap, String> {
 		let total_issuance: T::Balance = self.balances.iter().fold(Zero::zero(), |acc, &(_, n)| acc + n);
 
-		let mut r: runtime_io::TestExternalities<Blake2Hasher> = map![
+		let mut r: primitives::StorageMap = map![
 			Self::hash(<NextEnumSet<T>>::key()).to_vec() => T::AccountIndex::sa(self.balances.len() / ENUM_SET_SIZE).encode(),
 			Self::hash(<TransactionBaseFee<T>>::key()).to_vec() => self.transaction_base_fee.encode(),
 			Self::hash(<TransactionByteFee<T>>::key()).to_vec() => self.transaction_byte_fee.encode(),
@@ -79,6 +77,6 @@ impl<T: Trait> primitives::BuildStorage for GenesisConfig<T> {
 		for (who, value) in self.balances.into_iter() {
 			r.insert(Self::hash(&<FreeBalance<T>>::key_for(who)).to_vec(), value.encode());
 		}
-		Ok(r.into())
+		Ok(r)
 	}
 }

substrate/srml/balances/src/mock.rs

@@ -19,8 +19,8 @@
 #![cfg(test)]
 
 use primitives::BuildStorage;
-use primitives::testing::{Digest, Header};
-use substrate_primitives::{H256, Blake2Hasher};
+use primitives::testing::{Digest, DigestItem, Header};
+use substrate_primitives::{H256, Blake2Hasher, RlpCodec};
 use runtime_io;
 use {GenesisConfig, Module, Trait, system};
 
@@ -41,6 +41,7 @@ impl system::Trait for Runtime {
 	type AccountId = u64;
 	type Header = Header;
 	type Event = ();
+	type Log = DigestItem;
 }
 impl Trait for Runtime {
 	type Balance = u64;
@@ -50,7 +51,7 @@ impl Trait for Runtime {
 	type Event = ();
 }
 
-pub fn new_test_ext(ext_deposit: u64, monied: bool) -> runtime_io::TestExternalities<Blake2Hasher> {
+pub fn new_test_ext(ext_deposit: u64, monied: bool) -> runtime_io::TestExternalities<Blake2Hasher, RlpCodec> {
 	let mut t = system::GenesisConfig::<Runtime>::default().build_storage().unwrap();
 	let balance_factor = if ext_deposit > 0 {
 		256
@@ -73,7 +74,7 @@ pub fn new_test_ext(ext_deposit: u64, monied: bool) -> runtime_io::TestExternali
 	t.into()
 }
 
-pub fn new_test_ext2(ext_deposit: u64, monied: bool) -> runtime_io::TestExternalities<Blake2Hasher> {
+pub fn new_test_ext2(ext_deposit: u64, monied: bool) -> runtime_io::TestExternalities<Blake2Hasher, RlpCodec> {
 	let mut t = system::GenesisConfig::<Runtime>::default().build_storage().unwrap();
 	let balance_factor = if ext_deposit > 0 {
 		256