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Introduce on_runtime_upgrade (#5058)

Browse Source 
* Initial idea of `on_runtime_upgrade`

* Runtime storage for module version

* Gui shawntabrizi runtime upgrade (#5118)

* adding unleash to ci (#5020)

* adding unleash to ci

* fixing formatting

* with a dot please

* alpha.3 now

* do not publish testing helpers

* remove old test-helpers cruft

* fix cargo.lock

* with alpha 4

* do not publish runtime-interface-test either

* disable more test crates from publishing

* switch to alpha.5

* replace tempdir with tempfile

* update lru

* switch to bytes 0.5

* release script fixes

* switch on and to latest alpha

* BUT THE SPACES

* Fix: CI failing for some CLI tests (#5043)

* Initial commit

Forked at: ad90ab7ec9
Parent branch: origin/master

* Increase killing grace period of CLI tests and display more info

* Use --dev everywhere possible

* Put pruning mode to its own params struct

* Add pruning params to export-blocks command

* Added missing file

* Removed not-dev mode in tests

* Add pruning mode to the revert command

* Decrease killing grace period again

* Move back unsafe_pruning to import_params

* Applied proposed changes

* aura: remove unused tx pool (#5046)

* aura: remove unused transaction pool parameter

* node-template: remove transaction pool from aura

* aura: fix tests

* Extend rust nightly detection in `wasm-builder` (#5021)

Instead of just testing `cargo` and `rustup run nightly`, we now test
the `CARGO` env variable and also scan non default nightlies. The user
is also now able to select the toolchain with `WASM_BUILD_TOOLCHAIN`.

* Add steps setting to benchmarking CLI (#5033)

* Add steps setting to CLI, use max value to hit worst case.

* Bump impl_version.

* Apply review suggestion.

* Remove indices from node-template (#5025)

* Remove indices from node-template

* Use identity lookup instead

* Bump impl

* clean cargo.toml

* Fix documentation for "BlockBuilder::push_trusted" (#5051)

* fix doc

* rephrase

* do not check unleash on every PR, only master and tags (#5054)

* do not check unleash on every PR, only master and tags

* move scripts folder

* add signed-tag check to CI

* remove publish-to-crates-io dependencies

Co-authored-by: s3krit <pugh@s3kr.it>

* prepare version to alpha.1 (#5055)

bump version to -alpha.1

* Sync: validate block responses for required data (#5052)

* Less verbose state-db logging

* Validate block responses for block bodies

* Update client/network/src/protocol.rs

Co-Authored-By: Bastian Köcher <bkchr@users.noreply.github.com>

* Added validation test

* Disconnect on missing header as well

* Typo

Co-Authored-By: André Silva <andre.beat@gmail.com>

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: André Silva <andre.beat@gmail.com>

* Make these chainspecs fields private (#5031)

* Fix dockerfile (#5059)

* Adds documentation for `wipe` and `commit` (#5053)

* Adds documentation for `wipe` and `commit`

This adds documentation to `wipe` and `commit` of `Externalities`.
Besides that it removes the default implementation that would just panic
and requires that all implementers of the trait implement the functions.

* Update primitives/externalities/src/lib.rs

Co-Authored-By: joe petrowski <25483142+joepetrowski@users.noreply.github.com>

Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>

* Fix the issue with `trybuild`'s `ui` tests (#4992)

* repro ui bug

* fix the tests

* test with the new image

* test without CARGO_HOME

* test without fixes

* test again

* fix trybuild old versions

* bump CArgo.lock

* fix trybuild newest versions

* bump Cargo.lock

* trying on the latest image

* bump Cargo.lock

* run with the old image

* ci will be green on the image from 2020-02-19 [skip ci]

* bump Cargo.lock

* Activate publishing of draft releases... (#5062)

* Activate publishing of draft releases...

... And fix the message sending (missing parameter).

* publish_draft_release.sh now checks latest...

... release on github rather than just a tag

* Fix/div by zero (#5041)

* Handle gas_price being zero separately

* Bump spec_version

* Add a unit & integration tests for gas price = 0

* set missing metadata fields, prepping alpha.2 (#5067)

* setting first batch of descriptions

* fix what I just broke

* next batch

* and pallets, too

* last batch

* set cargo.lock

* keep'em dev-deps

* bump version to alpha.2

* Fix revalidation not revalidating multiple times (#5065)

* removes use of sc_client::Client from sc_finality_grandpa (#5030)

* removes use of sc_client::Client from sc_finality_grandpa

* code formatting

* code formatting

* removes use of sc_client::Client from sc_finality_grandpa

* Remove deprecated host functions (#5038)

Sadly we need to keep one function `ext_blake2_256`. This function is
manually defined in `sp-core`.

* removes use of sc_client::Client from sc_basic_authorship (#5050)

* removes use of sc-client from sc-basic-authorship

* refactor use of ProposerFactory

* correct dep path

* pallet-transaction-payment clean up (#5070)

* Formatting clean up

* Introduce separate setters for the fees.

* *: Rename prometheus-exporter crate to substrate-prometheus-end… (#5076)

This patch renames the crate for the following two reasons:

1. The prometheus-exporter crate introduces native in-process Prometheus
style instrumentation to the Substrate project. Within the Prometheus
ecosystem the term "exporter" is used for external processes exposing
metrics for e.g. the Linux Kernel. In-process exposition would be
described via the term "endpoint".

2. "prometheus-exporter" is generic and ignores the fact that it is only
usable within the context of Substrate. In addition the name
"prometheus-exporter" is already taken on crates.io.

* rename `browser-utils` to `substrate-browser-utils` (#5079)

* prepping for Alpha.3 (#5080)

* Bump to alpha.3

* update gitlab-ci

* Propagate DispatchError for benchmarks. (#5075)

* Propagate DispatchError for benchmarks.

* Apply review suggestions.

* Use RuntimeString.

* fix expect

Co-Authored-By: Bastian Köcher <bkchr@users.noreply.github.com>

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Add options to overwrite range bounds in benchmark command. (#5072)

* Add --mins --maxs to benchmark command.

* Apply review suggestions.

* Update yamux to version 0.4.4. (#5086)

* Remove more instances of futures01 (#4633)

* Start removing last few instances of futures01

* Use to_poll on wasm

* Revert "Use to_poll on wasm"

This reverts commit 1c61728f10d520df5f9b28c415a0db68e478b9c7.

* Fix fg test

* Upgrade network test futures

* Update offchain hyper version

* Update service test

* bump tokio to 0.2.10

* Removed some unneeded tokios

* fixes

* fix run_until_all_full

* Make service test debuggable

* Update client/offchain/src/api/http.rs

Co-Authored-By: Demi Obenour <48690212+DemiMarie-parity@users.noreply.github.com>

* Add service_test to test-int output

* nitpicking

* Finally fix test

* Give up and revert client/serviec/test

* Revert gitlab ci too

Co-authored-by: Demi Obenour <demi@parity.io>

* Make export blocks default to json on stdout (#5090)

* Make export blocks default to json on stdout

* Multiline instead of single line to stay under 100 cols

* Change --json flag to --binary, defaulting to json

* Offence reporting returns a result (#5082)

* Offence reporting returns a result

* Bump spec_version

* Use unwrap instead of assertions

* Fix more review grumbles

* Update to libp2p 0.16.2 (#5088)

* Remove request ID from the new protocol (#5049)

* Make sure we remove a peer on disconnect in gossip (#5104)

* Make sure we remove peers on disconnect in gossip state machine

* Clear up the code

* Add a comment

* Expose `state-db` memory info (#5110)

This exposes memory statistics from the state-db.

* Change extrinsic_count to extrinsic_index in pallet-utility (#5044)

Co-authored-by: Benjamin Kampmann <ben.kampmann@googlemail.com>

* Add more metrics to prometheus (#5034)

* Add a few things

* Add finality_grandpa_round

* fix fg tests

* Nitpicks

* Nitpicks

* Fix name of prometheus crate

* Update to SCALE 1.2.0 (#5113)

This updates `parity-scale-codec` to `1.2.0`, which includes multiple
performance improvements and a fix that bounds the capacity of a vector
at decoding.

* Lazy payouts (#4474)

* TODOs

* Remove superfluous:

* partial implementation

* full implementation

* fix preferences

* update comments

* upgrade test WIP

* fix more tests

* fix cutoff

* fix saturation

* comment

* upgrade mock

* upgrade test

* WIP migration

* WIP migration

* remove slot stake stuff

* fix merge

* migration of ledger

* remove equalize from test

* add test

* fix

* update doc

* fix compilation

* improve test readibility

* improve doc

* fix most todo

* fix migration and test

* remove println

* WIP

* add test and spec

* weight

* update doc

* safer end_era

* fix exposure of conversion

* Revert "safer end_era"

This reverts commit 72ff737d27be67d87308514b13e2574bc5f09fce.

* fix useless put

* exposure clipped

* doc

* fix payout with clipped

* fix node runtime

* add doc

* pluggable and generalized staking module

* remove print

* update doc

* refactor

* improve documentation and implementation

* fix test

* Fix test

* fix test

* fix test

* fix remove lowest stake from exposure, not biggest.

* nomination index arguments in nominator_payout

* add test

* try to fix offence

* apply slashed and bond eras until active era

* doc

* update spec version

* add test upgrade from previous test environment

* Apply suggestions from code review

Co-Authored-By: Shawn Tabrizi <shawntabrizi@gmail.com>

* nominators upgrade has been cleaned

* dynamic history depth implementation

* make current_era - history_depth included

* Change equality check to start era to less than or equal

* Use era specific validator prefs

* Add print statement and comment about start era if <

* fix next_reward overflow

* make more check for bad era claim for zero cost

* small refactor

* code refactor + fix use of deprecated storage

* fix wasm build

* add comment

* Fix tests

* remove outdated comment

* Apply suggestions from code review

Co-Authored-By: Shawn Tabrizi <shawntabrizi@gmail.com>

* gather active era information into one storage

Co-authored-by: thiolliere <gui.thiolliere@gmail.com>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* impl on_runtime_upgrade

Co-authored-by: Benjamin Kampmann <ben.kampmann@googlemail.com>
Co-authored-by: Cecile Tonglet <cecile.tonglet@cecton.com>
Co-authored-by: André Silva <andre.beat@gmail.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Marcio Diaz <marcio@parity.io>
Co-authored-by: Nikolay Volf <nikvolf@gmail.com>
Co-authored-by: s3krit <pugh@s3kr.it>
Co-authored-by: Arkadiy Paronyan <arkady.paronyan@gmail.com>
Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>
Co-authored-by: Chevdor <chevdor@users.noreply.github.com>
Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>
Co-authored-by: Denis Pisarev <denis.pisarev@parity.io>
Co-authored-by: Eric <e.lim0322@gmail.com>
Co-authored-by: Seun Lanlege <seunlanlege@gmail.com>
Co-authored-by: Sergei Pepyakin <s.pepyakin@gmail.com>
Co-authored-by: Max Inden <mail@max-inden.de>
Co-authored-by: Ashley <ashley.ruglys@gmail.com>
Co-authored-by: Toralf Wittner <tw@dtex.org>
Co-authored-by: Demi Obenour <demi@parity.io>
Co-authored-by: pscott <30843220+pscott@users.noreply.github.com>
Co-authored-by: Fedor Sakharov <fedor.sakharov@gmail.com>
Co-authored-by: Gavin Wood <github@gavwood.com>
Co-authored-by: thiolliere <gui.thiolliere@gmail.com>

* make compile

* Add some tests

* docs

* Remove "useless" code

* Fix merge and use n + 1 block number

* Fix tests

* unfix ui tests

* Update on_initialize.stderr

* fix test

* Fix test

* Bump spec

* Remove `on_finalise` and `on_initialise`

* Use bool for tracking runtime upgraded

* typo

* Support runtime upgrade with `set_storage`

* Refactor migration code location

* add trailing newlines

* Remove old `IsUpgraded` flag

* Update state root

* Exhaustive match statement

* Apply suggestions from code review

Co-Authored-By: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

Co-authored-by: Benjamin Kampmann <ben.kampmann@googlemail.com>
Co-authored-by: Cecile Tonglet <cecile.tonglet@cecton.com>
Co-authored-by: André Silva <andre.beat@gmail.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Marcio Diaz <marcio@parity.io>
Co-authored-by: Nikolay Volf <nikvolf@gmail.com>
Co-authored-by: s3krit <pugh@s3kr.it>
Co-authored-by: Arkadiy Paronyan <arkady.paronyan@gmail.com>
Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>
Co-authored-by: Chevdor <chevdor@users.noreply.github.com>
Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>
Co-authored-by: Denis Pisarev <denis.pisarev@parity.io>
Co-authored-by: Eric <e.lim0322@gmail.com>
Co-authored-by: Seun Lanlege <seunlanlege@gmail.com>
Co-authored-by: Sergei Pepyakin <s.pepyakin@gmail.com>
Co-authored-by: Max Inden <mail@max-inden.de>
Co-authored-by: Ashley <ashley.ruglys@gmail.com>
Co-authored-by: Toralf Wittner <tw@dtex.org>
Co-authored-by: Demi Obenour <demi@parity.io>
Co-authored-by: pscott <30843220+pscott@users.noreply.github.com>
Co-authored-by: Fedor Sakharov <fedor.sakharov@gmail.com>
Co-authored-by: Gavin Wood <github@gavwood.com>
Co-authored-by: thiolliere <gui.thiolliere@gmail.com>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
This commit is contained in:
Gavin Wood
2020-03-05 13:44:18 +01:00
committed by GitHub
parent 906e08ee2a
commit df77c4bf37
21 changed files with 811 additions and 513 deletions
Download Patch File Download Diff File Expand all files Collapse all files
substrate/frame/balances/src/lib.rs
+21 -84
View File
@@ -157,6 +157,7 @@ mod tests_composite;
mod tests;
#[cfg(feature = "runtime-benchmarks")]
mod benchmarking;
mod migration;
use sp_std::prelude::*;
use sp_std::{cmp, result, mem, fmt::Debug, ops::BitOr, convert::Infallible};
@@ -348,6 +349,21 @@ impl<Balance: Saturating + Copy + Ord> AccountData<Balance> {
}
}
// A value placed in storage that represents the current version of the Balances storage.
// This value is used by the `on_runtime_upgrade` logic to determine whether we run
// storage migration logic. This should match directly with the semantic versions of the Rust crate.
#[derive(Encode, Decode, Clone, Copy, PartialEq, Eq, RuntimeDebug)]
enum Releases {
V1_0_0,
V2_0_0,
}
impl Default for Releases {
fn default() -> Self {
Releases::V1_0_0
}
}
decl_storage! {
trait Store for Module<T: Trait<I>, I: Instance=DefaultInstance> as Balances {
/// The total units issued in the system.
@@ -367,10 +383,10 @@ decl_storage! {
/// NOTE: Should only be accessed when setting, changing and freeing a lock.
pub Locks get(fn locks): map hasher(blake2_256) T::AccountId => Vec<BalanceLock<T::Balance>>;
/// True if network has been upgraded to this version.
/// Storage version of the pallet.
///
/// True for new networks.
IsUpgraded build(|_: &GenesisConfig<T, I>| true): bool;
/// This is set to v2.0.0 for new networks.
StorageVersion build(|_: &GenesisConfig<T, I>| Releases::V2_0_0): Releases;
}
add_extra_genesis {
config(balances): Vec<(T::AccountId, T::Balance)>;
@@ -518,11 +534,8 @@ decl_module! {
<Self as Currency<_>>::transfer(&transactor, &dest, value, KeepAlive)?;
}
fn on_initialize() {
if !IsUpgraded::<I>::get() {
IsUpgraded::<I>::put(true);
Self::do_upgrade();
}
fn on_runtime_upgrade() {
migration::on_runtime_upgrade::<T, I>();
}
}
}
@@ -548,82 +561,6 @@ impl<Balance, BlockNumber> OldBalanceLock<Balance, BlockNumber> {
impl<T: Trait<I>, I: Instance> Module<T, I> {
// PRIVATE MUTABLES
// Upgrade from the pre-#4649 balances/vesting into the new balances.
pub fn do_upgrade() {
sp_runtime::print("Upgrading account balances...");
// First, migrate from old FreeBalance to new Account.
// We also move all locks across since only accounts with FreeBalance values have locks.
// FreeBalance: map T::AccountId => T::Balance
for (hash, free) in StorageIterator::<T::Balance>::new(b"Balances", b"FreeBalance").drain() {
let mut account = AccountData { free, ..Default::default() };
// Locks: map T::AccountId => Vec<BalanceLock>
let old_locks = get_storage_value::<Vec<OldBalanceLock<T::Balance, T::BlockNumber>>>(b"Balances", b"Locks", &hash);
if let Some(locks) = old_locks {
let locks = locks.into_iter()
.map(|i| {
let (result, expiry) = i.upgraded();
if expiry != T::BlockNumber::max_value() {
// Any `until`s that are not T::BlockNumber::max_value come from
// democracy and need to be migrated over there.
// Democracy: Locks get(locks): map T::AccountId => Option<T::BlockNumber>;
put_storage_value(b"Democracy", b"Locks", &hash, expiry);
}
result
})
.collect::<Vec<_>>();
for l in locks.iter() {
if l.reasons == Reasons::All || l.reasons == Reasons::Misc {
account.misc_frozen = account.misc_frozen.max(l.amount);
}
if l.reasons == Reasons::All || l.reasons == Reasons::Fee {
account.fee_frozen = account.fee_frozen.max(l.amount);
}
}
put_storage_value(b"Balances", b"Locks", &hash, locks);
}
put_storage_value(b"Balances", b"Account", &hash, account);
}
// Second, migrate old ReservedBalance into new Account.
// ReservedBalance: map T::AccountId => T::Balance
for (hash, reserved) in StorageIterator::<T::Balance>::new(b"Balances", b"ReservedBalance").drain() {
let mut account = get_storage_value::<AccountData<T::Balance>>(b"Balances", b"Account", &hash).unwrap_or_default();
account.reserved = reserved;
put_storage_value(b"Balances", b"Account", &hash, account);
}
// Finally, migrate vesting and ensure locks are in place. We will be lazy and just lock
// for the maximum amount (i.e. at genesis). Users will need to call "vest" to reduce the
// lock to something sensible.
// pub Vesting: map T::AccountId => Option<VestingSchedule>;
for (hash, vesting) in StorageIterator::<(T::Balance, T::Balance, T::BlockNumber)>::new(b"Balances", b"Vesting").drain() {
let mut account = get_storage_value::<AccountData<T::Balance>>(b"Balances", b"Account", &hash).unwrap_or_default();
let mut locks = get_storage_value::<Vec<BalanceLock<T::Balance>>>(b"Balances", b"Locks", &hash).unwrap_or_default();
locks.push(BalanceLock {
id: *b"vesting ",
amount: vesting.0.clone(),
reasons: Reasons::Misc,
});
account.misc_frozen = account.misc_frozen.max(vesting.0.clone());
put_storage_value(b"Vesting", b"Vesting", &hash, vesting);
put_storage_value(b"Balances", b"Locks", &hash, locks);
put_storage_value(b"Balances", b"Account", &hash, account);
}
for (hash, balances) in StorageIterator::<AccountData<T::Balance>>::new(b"Balances", b"Account").drain() {
let nonce = take_storage_value::<T::Index>(b"System", b"AccountNonce", &hash).unwrap_or_default();
let mut refs: system::RefCount = 0;
// The items in Kusama that would result in a ref count being incremented.
if have_storage_value(b"Democracy", b"Proxy", &hash) { refs += 1 }
// We skip Recovered since it's being replaced anyway.
let mut prefixed_hash = twox_64(&b":session:keys"[..]).to_vec();
prefixed_hash.extend(&b":session:keys"[..]);
prefixed_hash.extend(&hash[..]);
if have_storage_value(b"Session", b"NextKeys", &prefixed_hash) { refs += 1 }
if have_storage_value(b"Staking", b"Bonded", &hash) { refs += 1 }
put_storage_value(b"System", b"Account", &hash, (nonce, refs, &balances));
}
}
/// Get the free balance of an account.
pub fn free_balance(who: impl sp_std::borrow::Borrow<T::AccountId>) -> T::Balance {
Self::account(who.borrow()).free
substrate/frame/balances/src/migration.rs
+88
View File
@@ -0,0 +1,88 @@
use super::*;
pub fn on_runtime_upgrade<T: Trait<I>, I: Instance>() {
match StorageVersion::<I>::get() {
Releases::V2_0_0 => return,
Releases::V1_0_0 => upgrade_v1_to_v2::<T, I>(),
}
}
// Upgrade from the pre-#4649 balances/vesting into the new balances.
fn upgrade_v1_to_v2<T: Trait<I>, I: Instance>() {
sp_runtime::print("Upgrading account balances...");
// First, migrate from old FreeBalance to new Account.
// We also move all locks across since only accounts with FreeBalance values have locks.
// FreeBalance: map T::AccountId => T::Balance
for (hash, free) in StorageIterator::<T::Balance>::new(b"Balances", b"FreeBalance").drain() {
let mut account = AccountData { free, ..Default::default() };
// Locks: map T::AccountId => Vec<BalanceLock>
let old_locks = get_storage_value::<Vec<OldBalanceLock<T::Balance, T::BlockNumber>>>(b"Balances", b"Locks", &hash);
if let Some(locks) = old_locks {
let locks = locks.into_iter()
.map(|i| {
let (result, expiry) = i.upgraded();
if expiry != T::BlockNumber::max_value() {
// Any `until`s that are not T::BlockNumber::max_value come from
// democracy and need to be migrated over there.
// Democracy: Locks get(locks): map T::AccountId => Option<T::BlockNumber>;
put_storage_value(b"Democracy", b"Locks", &hash, expiry);
}
result
})
.collect::<Vec<_>>();
for l in locks.iter() {
if l.reasons == Reasons::All || l.reasons == Reasons::Misc {
account.misc_frozen = account.misc_frozen.max(l.amount);
}
if l.reasons == Reasons::All || l.reasons == Reasons::Fee {
account.fee_frozen = account.fee_frozen.max(l.amount);
}
}
put_storage_value(b"Balances", b"Locks", &hash, locks);
}
put_storage_value(b"Balances", b"Account", &hash, account);
}
// Second, migrate old ReservedBalance into new Account.
// ReservedBalance: map T::AccountId => T::Balance
for (hash, reserved) in StorageIterator::<T::Balance>::new(b"Balances", b"ReservedBalance").drain() {
let mut account = get_storage_value::<AccountData<T::Balance>>(b"Balances", b"Account", &hash).unwrap_or_default();
account.reserved = reserved;
put_storage_value(b"Balances", b"Account", &hash, account);
}
// Finally, migrate vesting and ensure locks are in place. We will be lazy and just lock
// for the maximum amount (i.e. at genesis). Users will need to call "vest" to reduce the
// lock to something sensible.
// pub Vesting: map T::AccountId => Option<VestingSchedule>;
for (hash, vesting) in StorageIterator::<(T::Balance, T::Balance, T::BlockNumber)>::new(b"Balances", b"Vesting").drain() {
let mut account = get_storage_value::<AccountData<T::Balance>>(b"Balances", b"Account", &hash).unwrap_or_default();
let mut locks = get_storage_value::<Vec<BalanceLock<T::Balance>>>(b"Balances", b"Locks", &hash).unwrap_or_default();
locks.push(BalanceLock {
id: *b"vesting ",
amount: vesting.0.clone(),
reasons: Reasons::Misc,
});
account.misc_frozen = account.misc_frozen.max(vesting.0.clone());
put_storage_value(b"Vesting", b"Vesting", &hash, vesting);
put_storage_value(b"Balances", b"Locks", &hash, locks);
put_storage_value(b"Balances", b"Account", &hash, account);
}
for (hash, balances) in StorageIterator::<AccountData<T::Balance>>::new(b"Balances", b"Account").drain() {
let nonce = take_storage_value::<T::Index>(b"System", b"AccountNonce", &hash).unwrap_or_default();
let mut refs: system::RefCount = 0;
// The items in Kusama that would result in a ref count being incremented.
if have_storage_value(b"Democracy", b"Proxy", &hash) { refs += 1 }
// We skip Recovered since it's being replaced anyway.
let mut prefixed_hash = twox_64(&b":session:keys"[..]).to_vec();
prefixed_hash.extend(&b":session:keys"[..]);
prefixed_hash.extend(&hash[..]);
if have_storage_value(b"Session", b"NextKeys", &prefixed_hash) { refs += 1 }
if have_storage_value(b"Staking", b"Bonded", &hash) { refs += 1 }
put_storage_value(b"System", b"Account", &hash, (nonce, refs, &balances));
}
take_storage_value::<T::Index>(b"Balances", b"IsUpgraded", &[]);
StorageVersion::<I>::put(Releases::V2_0_0);
}