* Base features and traits.
* pallet and unsigned phase
* Undo bad formattings.
* some formatting cleanup.
* Small self-cleanup.
* Make it all build
* self-review
* Some doc tests.
* Some changes from other PR
* Fix session test
* Update Cargo.lock
* Update frame/election-provider-multi-phase/src/lib.rs
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
* Some review comments
* Rename + make encode/decode
* Do an assert as well, just in case.
* Fix build
* Update frame/election-provider-multi-phase/src/unsigned.rs
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
* Las comment
* fix staking fuzzer.
* cargo run --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_election_provider_multi_phase --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/election-provider-multi-phase/src/weights.rs --template=./.maintain/frame-weight-template.hbs
* Add one last layer of feasibility check as well.
* Last fixes to benchmarks
* Some more docs.
* cargo run --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_election_provider_multi_phase --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/election-provider-multi-phase/src/weights.rs --template=./.maintain/frame-weight-template.hbs
* cargo run --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_election_provider_multi_phase --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/election-provider-multi-phase/src/weights.rs --template=./.maintain/frame-weight-template.hbs
* Some nits
* It all works
* Some self cleanup
* Update frame/staking/src/lib.rs
Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>
* remove most todos.
* Round of self-review.
* Fix migration
* clean macro
* Revert wrong merge
* Make the number of nominations configurable
* Self reivew
* renmae.
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
Co-authored-by: Parity Benchmarking Bot <admin@parity.io>
Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>
* Use 'Pallet' struct in construct_runtime.
* Fix genesis and metadata macro.
* Fix 'Pallet' type alias.
* Replace 'Module' with 'Pallet' for all construct_runtime use cases.
* Replace more deprecated 'Module' struct.
* Bring back AllModules and AllPalletsWithSystem type, but deprecate them.
* Replace deprecated 'Module' struct from merge master.
* Minor fix.
* Fix UI tests.
* Revert UI override in derive_no_bound.
* Fix more deprecated 'Module' use from master branch.
* Fix more deprecated 'Module' use from master branch.
* use more efficient search through candidates in offchain-election
* mark linear accessors as test-only in election-provider-multi-phase
This prevents production code which uses them from compiling.
Also write an efficient helper for getting the target index.
* doc grammar
* use faster target_index_fn in benchmarks
* unbox helper functions
* remove unnecessary import
* write lifetime after primary trait
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
* Don't log so many stkaing events on genesis block
* Clean a few more warn and info logs
* Update frame/staking/src/lib.rs
* Update frame/staking/src/lib.rs
* Apply.
* get rid of glob import
* use meaningful generic type name
* pjr_check operates on `Supports` struct used elsewhere
* improve algorithmic complexity of `prepare_pjr_input`
* fix rustdoc warnings
* improve module docs
* typo
* simplify debug assertion
* add test finding the phase-change threshold value for a constructed scenario
* add more threshold scenarios to disambiguate plausible interpretations
* add link to npos paper reference
* docs: staked_assignment -> supports
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
* add utility method for generating npos inputs
* add a fuzzer which asserts that all unbalanced seq_phragmen are PJR
Note that this currently fails. I hope that this can be rectified
by calculating the threshold instead of choosing some arbitrary number.
* assert in all cases, not just debug
* leverage a native solution to choose candidates
* use existing helper methods
* add pjr-check and incorporate into the fuzzer
We should probably have one of the W3F people look at this to ensure
we're not misconstruing any definitions, but this seems like a
fairly straightforward implementation.
* fix compilation errors
* Enable manually setting iteration parameters in single run.
This gives us the ability to reproducably extract cases where
honggfuzz has discovered a panic. For example:
$ cargo run --release --bin phragmen_pjr -- --candidates 569 --voters 100
Tue 23 Feb 2021 11:23:39 AM CET
Compiling bitflags v1.2.1
Compiling unicode-width v0.1.8
Compiling unicode-segmentation v1.7.1
Compiling ansi_term v0.11.0
Compiling strsim v0.8.0
Compiling vec_map v0.8.2
Compiling proc-macro-error-attr v1.0.4
Compiling proc-macro-error v1.0.4
Compiling textwrap v0.11.0
Compiling atty v0.2.14
Compiling heck v0.3.2
Compiling clap v2.33.3
Compiling structopt-derive v0.4.14
Compiling structopt v0.3.21
Compiling sp-npos-elections-fuzzer v2.0.0-alpha.5 (/home/coriolinus/Documents/Projects/paritytech/substrate/primitives/npos-elections/fuzzer)
Finished release [optimized] target(s) in 6.15s
Running `/home/coriolinus/Documents/Projects/paritytech/substrate/target/release/phragmen_pjr -c 569 -v 100`
thread 'main' panicked at 'unbalanced sequential phragmen must satisfy PJR', primitives/npos-elections/fuzzer/src/phragmen_pjr.rs:133:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
This is still not adequate proof that seq_phragmen is broken; it could
very well be that our PJR checker is doing the wrong thing, or we've
somehow missed a parameter of interest. Still, it's concerning.
* update comment verbiage for accuracy
* it is valid in PJR for an elected candidate to have 0 support
* Fix phragmen_pjr fuzzer
It turns out that the fundamental problem causing previous implementations
of the fuzzer to fail wasn't in `seq_phragmen` _or_ in `pjr_check`: it was
in the rounding errors introduced in the various conversions between the
internal data representation and the external one.
Fixing the fuzzer is then simply an issue of using the internal representation
and staying in that representation. However, that leaves the issue that
`seq_phragmen` occasionally produces an output which is technically not
PJR due to rounding errors. In the future we will need to add some kind of
"close-enough" threshold. However, that is explicitly out of scope of
this PR.
* restart ci; it appears to be stalled
* use necessary import for no-std
* use a more realistic distribution of voters and candidates
This isn't ideal; more realistic numbers would be about twice these.
However, either case generation or voting has nonlinear execution
time, and doubling these values brings iteration time from ~20s to
~180s. Fuzzing 6x as fast should make up for fuzzing cases half the size.
* identify specifically which PJR check may fail
* move candidate collection comment into correct place
* standard_threshold: use a calculation method which cannot overflow
* Apply suggestions from code review (update comments)
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
* clarify the effectiveness bounds for t-pjr check
* how to spell "committee"
* reorganize: high -> low abstraction
* ensure standard threshold calc cannot panic
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
* Apply suggestions from code review
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: kianenigma <kian.peymani@gmail.com>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
* Add MMR custom RPC.
* Change RuntimeApi to avoid hardcoding leaf type.
* Properly implement the new RuntimeAPI and wire up RPC.
* Extract Offchain DB as separate execution extension.
* Enable offchain DB access for offchain calls.
* Fix offchain_election tests.
* Skip block initialisation for proof generation.
* Fix integration test setup.
* Fix offchain tests. Not sure how I missed them earlier 🤷.
* Fix long line.
* One more test missing.
* Update mock for multi-phase.
* Address review grumbbles.
* Address review grumbles.
* Fix line width of a comment
* Init `RuntimeLogger` automatically for each runtime api call
This pr change the runtime api in such a way to always and automatically
enable the `RuntimeLogger`. This enables the user to use `log` or
`tracing` from inside the runtime to create log messages. As logging
introduces some extra code and especially increases the size of the wasm
blob. It is advised to disable all logging completely with
`sp-api/disable-logging` when doing the wasm builds for the on-chain
wasm runtime.
Besides these changes, the pr also brings most of the logging found in
frame to the same format "runtime::*".
* Update frame/im-online/src/lib.rs
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
* Update test-utils/runtime/Cargo.toml
* Fix test
* Don't use tracing in the runtime, as we don't support it :D
* Fixes
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
* Create a macro which automates creation of benchmark test suites.
* bump impl_version
* allow unused on test_bench_by_name
* use proper doctest ignore attribute
* Explicitly hand the Module to the test suite
Much better practice than depending on it showing up implicitly in
the namespace.
* explicitly import what we need into `mod tests`
* bench_module is `ident` not `tt`
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
* allow end users to specify arguments for new_test_ext
This turned out to be surprisingly easy. On reflection, it turns out
that of course the compiler can't eagerly evaluate the function call,
but needs to paste it in everywhere desired.
* enable explicitly specifying the path to the benchmarks invocation
also enable optional trailing commas
* Revert "bump impl_version"
This reverts commit 0209e4de33fd43873f8cfc6875815d0fd6151e63.
* list failing benchmark tests and the errors which caused the failure
* harden benchmark tests against internal panics
* suppress warning about ignored profiles
unfortunately, setting the profile here doesn't do anything; we'd
need to set it in every leaf package anyway. However, as this was
just making the default explicit anyway, I think it's safe enough
to remove entirely.
* impl_benchmark_test_suite for assets
* impl_benchmark_test_suite for balances
* impl_benchmark_test_suite for bounties
* impl_benchmark_test_suite for Collective
* impl_benchmark_test_suite for Contracts
* impl_benchmark_test_suite for Democracy
* don't impl_benchmark_test_suite for Elections-Phragmen
* impl_benchmark_test_suite for Identity
Note that Identity tests currently fail. They failed in an identical
way before this change, so as far as I'm concerned, the status quo is
good enough for now.
* impl_benchmark_test_suite for ImOnline
* impl_benchmark_test_suite for indices
For this crate also, the test suite fails identically with and without
this change, so we can say that this change is not the cause of the
tests' failure to compile.
* impl_benchmark_test_suite for lottery
* impl_benchmark_test_suite for merkle-mountain-range
* impl_benchmark_test_suite for Multisig
These tests fail identically with and without the change, so the change
seems unlikely to be the origin of the failures.
* impl_benchmark_test_suite for offences
* impl_benchmark_test_suite for Proxy
Fails identically with and without this change.
* impl_benchmark_test_suite for scheduler
* impl_benchmark_test_suite for session
It turns out to be important to be able to exclude items marked
`#[extra]` sometimes. Who knew?
* impl_benchmark_test_suite for staking
* impl_benchmark_test_suite for system
* impl_benchmark_test_suite for timestamp
* impl_benchmark_test_suite for tips
* impl_benchmark_test_suite for treasury
* impl_benchmark_test_suite for utility
Note that benchmark tests fail identically before and after this change.
* impl_benchmark_test_suite for vesting
* fix wrong module name in impl_benchmark_test_suite in Offences
* address line length nits
* enable optional keyword argument: exec_name
Took a _lot_ of macro-wrangling to get the functionality that I want,
but now you have the option to pass in
```rust
impl_benchmark_test_suite!(
Elections,
crate::tests::ExtBuilder::default().desired_members(13).desired_runners_up(7),
crate::tests::Test,
exec_name = build_and_execute,
);
```
and have it expand out properly. A selected fragment of the expansion:
```rust
fn test_benchmarks() {
crate::tests::ExtBuilder::default()
.desired_members(13)
.desired_runners_up(7)
.build_and_execute(|| {
```
* get rid of dead code
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
* Decouple the session validators from im-online
* .
* Add SessionInterface trait in im-online
Add ValidatorId in im-online Trait
Make im-online compile
Make substrate binary compile
* Fix merging issue
* Make all compile
* Fix tests
* Avoid using frame dep in primitives via pallet-session-common
* Merge ValidatorSet into SessionInterface trait
Wrap a few too long lines
Add some docs
* Move pallet-sesion-common into pallet-session
* Move SessionInterface to sp-session and impl it in session pallet
Ref https://github.com/paritytech/substrate/pull/7127#discussion_r494892472
* Split put historical::FullValidatorIdentification trait
* Fix line width
* Fix staking mock
* Fix session doc test
* Simplify <T as ValidatorIdentification<AccountId>>::ValidatorId as ValidatorId<T>
* Nits
* Clean up.
* Make it compile by commenting out report_offence_im_online bench
* Tests
* Nits
* Move OneSessionHandler to sp-session
* Fix tests
* Add some docs
* .
* Fix typo
* Rename to ValidatorSet::session_index()
* Add some more docs
* .
* Remove extra empty line
* Fix line width check
.
* Apply suggestions from code review
* Cleaup Cargo.toml
* Aura has migrated to Pallet now
Co-authored-by: Tomasz Drwięga <tomasz@parity.io>
* Attempt to remove the where bounds.
* Fix further and further.
* Format better.
* Update primitives/npos-elections/src/lib.rs
* fix build
* remove unused
* commented use of common
* hack to pass tests
* another hack
* remove all commented code
* fix the easy tests
* temp hack
* follow through comma hack until better solution
* patch macro
* missed one
* update benchmarks
* update docs
* fix docs
* removed too much
* fix changes
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
* fix periodic session
* Allow staking tests to run with session lengths other than 1.
* Update frame/staking/src/mock.rs
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
* Fix all tests with session length 5.
* Test for active != current
* Better doc
* Update frame/staking/src/lib.rs
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
* also set the timestamp properly.
* trigger CI
* Revert "trigger CI"
This reverts commit 0f254944cdad848aa6e63bd8a618db95447a8e68.
* Update frame/staking/src/lib.rs
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
* prevent bond_extra to cause staking actve lower than ed
* prevent bond_extra to cause staking actve lower than ed
* Check in post conditions.
* check rebond as well.
* also change withdraw_unbonded.
* Fix build
* change check format.
* Apply suggestions from code review
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
* Move `IsSubType` and write some docs for the trait
This moves the `IsSubType` trait from dispatch.rs to traits.rs. It also
adds docs to make the trait better understandable.
* Update frame/support/src/traits.rs
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
* Revamp npos-elections and implement phragmms
* Update primitives/npos-elections/src/phragmms.rs
* Fix build
* Some review grumbles
* Add some stuff for remote testing
* fix some of the grumbles.
* Add remote testing stuff.
* Cleanup
* fix docs
* Update primitives/arithmetic/src/rational.rs
Co-authored-by: Dan Forbes <dan@danforbes.dev>
* Small config change
* Better handling of approval_stake == 0
* Final touhces.
* Clean fuzzer a bit
* Clean fuzzer a bit
* Update primitives/npos-elections/src/balancing.rs
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
* Fix fuzzer.
* Better api for normalize
* Add noramlize_up
* A large number of small fixes.
* make it merge ready
* Fix warns
* bump
* Fix fuzzers a bit.
* Fix warns as well.
* Fix more tests.
Co-authored-by: Dan Forbes <dan@danforbes.dev>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
* Rename `ModuleToIndex` to `PalletRuntimeSetup`
Besides the renaming it also adds support getting the name of a pallet
as configured in the runtime.
* Rename it to `PalletInfo`
* Remove accidentally added files
* init_logger: switch from log-based to tracing-based and add compatibility layer
* Move tracing profiling subscriber related config realization
* sp-tracing: change profiling to be a layer instead of a subscriber
* Enable profiling layer in cli
* Change all test env_logger init to sp_tracing::try_init_simple
* Remove all local env_logger dependency
* Add missing tracing-subscriber dependency
* frame-sudo: fix tests
* frame-support: fix tests
* Fix frame/pallet and executor tests
* Fix the remaining tests
* Use subscriber's try_init as recommended by @davidbarsky
* Be explict that the tracing-log feature is needed
* Set subscriber writer to stderr
* Shorter line width
* Update cargo lock tracing version
* Fix sc_tracing crate compile
* Fix sc_authority_discovery crate test
* unremove default-features
* Leave enabled to default true
* Warn if global default cannot be set
* Fix unused import
* Remove unused PROXY_TARGET
* Change all reference from rc5 to rc6
* Change all reference of rc2 to rc6
* Fix styling
* Fix typo
* make logger init error'ing
* re-fixing the test issue
Co-authored-by: Benjamin Kampmann <ben@parity.io>
* Fix the benchmarks
* Migrate staking to weightInfo
* Fix global benchmarks
* re-calculate the submit solution weight.
* Fix some refund.
* Get rid of all the extra parameters.
* Fix staking tests.
* new values from the bench machine.
* Fix some grumbles
* better macro
* Some better doc
* Move to interpreted wasm
* Make it work temporarily
* Final fix of default ones.
* Fix payout benchmarks
* Fix payout stuff
* One last fix
* use benchmarking machine for numbers
* update weight docs
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
* change (ci): docs job optimized; runs every commit; fails on warnings
* change (ci): rename jobs; temporary allow failing
* change (ci): better warnings filtering
* fix (ci): hotfix Docker release
* test (ci): run docs job with flags
* test (ci): pwd fails
* change (ci): pass just //doc dir as an artifact; debug
* change (ci): return to the previous structure; undebug
* change (ci): typo
* rebase on upstream 2
* fix the jobname
* Fix some warnings (#7079)
* Partial fix for transaction priority (#7034)
* Partial fix for priority stuff.
* Small fix
* Fix tests.
* Update frame/transaction-payment/src/lib.rs
Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* Better doc
Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* What happens if we remove wat? (#7056)
* What happens if we remove wat?
* Update Cargo.lock
* Make SlashingSpans Public (#6961)
* Make SlashingSpans Public
Offchain Applications will often need to inspect this type because it is directly used in staking election, thus worthy of being `pub`. Rest of the slashing api can remain private, only this and the `fn last_non_zero_slash()` of `SlashingSpans` are of interest.
* Update frame/staking/src/lib.rs
* client/authority-discovery/src/service: Improve docs (#7059)
* Decrease poll interval (#7063)
* Remove unused code (#7027)
Signed-off-by: Jimmy Chu <jimmychu0807@gmail.com>
* Disambiguate `BlockNumber` type in `decl_module` (#7061)
* Disambiguate `BlockNumber` type in `decl_module`
* fix `frame-support-tests`
* fix ui tests
* fix trait order
* Implement `FromStr` for `Ss58AddressFormat` (#7068)
* Implement `FromStr` for `Ss58AddressFormat`
* Update primitives/core/src/crypto.rs
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
* Set reserved nodes with offchain worker. (#6996)
* add offchain worker api to set reserved nodes.
* new offchain api to get node public key.
* node public key from converter
* refactor set reserved nodes ocw api.
* new ndoe authorization pallet
* remove unnecessary clone and more.
* more
* tests for node authorization pallet
* remove dependency
* fix build
* more tests.
* refactor
* Update primitives/core/src/offchain/testing.rs
Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* Update frame/node-authorization/src/lib.rs
Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* Update frame/node-authorization/src/lib.rs
Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* Update frame/node-authorization/src/lib.rs
Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* format code
* expose NetworkService
* remove NetworkStateInfo in offchain
* replace NodePublicKey with PeerId.
* set max length of peer id.
* clear more
* use BTreeSet for set of peers.
* decode opaque peer id.
* extract NetworkProvider for client offchain.
* use OpaquePeerId in node authorization pallet.
* fix test
* better documentation
* fix test
* doc
* more fix
* Update primitives/core/src/offchain/mod.rs
Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>
* Update client/offchain/src/api.rs
Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>
* derive serialize and deserialize
Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>
* Fix some warnings
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
Co-authored-by: Sergei Shulepov <sergei@parity.io>
Co-authored-by: Max Inden <mail@max-inden.de>
Co-authored-by: s3krit <pugh@s3kr.it>
Co-authored-by: Jimmy Chu <jimmy@parity.io>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: kaichao <kaichaosuna@gmail.com>
Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>
* Fix more doc errors
* More doc fixes
* Remove subdb to make `rustdoc` happy
* Make the line length check happy
* Fix compilation error
* Another try
* Allow unused
Co-authored-by: Dan Forbes <dan@danforbes.dev>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
Co-authored-by: Sergei Shulepov <sergei@parity.io>
Co-authored-by: Max Inden <mail@max-inden.de>
Co-authored-by: s3krit <pugh@s3kr.it>
Co-authored-by: Jimmy Chu <jimmy@parity.io>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: kaichao <kaichaosuna@gmail.com>
Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>
Co-authored-by: Bastian Köcher <git@kchr.de>
* Make SlashingSpans Public
Offchain Applications will often need to inspect this type because it is directly used in staking election, thus worthy of being `pub`. Rest of the slashing api can remain private, only this and the `fn last_non_zero_slash()` of `SlashingSpans` are of interest.
* Update frame/staking/src/lib.rs
Kian Paimani