* Update copyright date to 2021

* Bump date in license header template

* Use more accurate weight calculation in declared weight

* Remove session length and validator set size config constants

* Remove config params from mock

* Allow specifying total number of votes-ancestries per justification

* Change limits used during benchmarking

* Regenerate weights

* Use simplified weight annotation

* Remove comment

* Address leftover TODO

* Prevent possible divide by zero errors

* Use correct argument order in weight declaration

* Stop passing raw encoded justifications to pallet API

By having the API accept a struct-ified justification we are able to
better utilize the justifications fields for weight calculations.

* Update relayer code to use decoded justifications

* Add justification to `expect()` statement

* Fix some imports

* Make justification wrapper contain decoded justification

* Rename some fields

* Get rid of warnings

* Appease Clippy

* Only decode justification once at init time

* Remove unnecessary method

* Remove justification wrapper

This became kinda unnecessary since we could implement the FinalityProof
trait on GrandpaJustification directly.

* Allow creation of authority lists with any number of authorities

* Move keyring helpers into their own module

* Add helper for generating list of test accounts

* Fix import names in tests

* Rename Keyring trait to Signer

* Get list of accounts in a more functional way

* Clarify meaning of `test_keyring` return type

* Use concrete test account type instead of generics

* Make sure voter set contains all authorities which signed off on pre-commits

* Add way to create tunable GRANDPA justifications

* Use new function in tests

* Allow multiple authorities on a single fork

* Only store pre-commit targets instead of full ancestry chains

* Rename precommit_header to be more generic

* Push new digest item instead of overriding entire digest

* Ensure that we generate chains with non-zero length

* Extract justification creation parameters into struct

* Appease Clippy

* Use `sp-application-crypto` when generating test justifications

* Try to justifications tests compiling

* Try using `ed25519_dalek` for justification creation

* Small cleanup

* Correctly generate a Keypair

The public key didn't correspond to what would be derived
with the given private key.

* Remove enum index hack

* Clean up test account helper functions

* Fix tests in `pallet-finality-verifier`

* Get `pallet-substrate-bridge` tests compiling again

* Use the correct keyring in justification tests

* Clean up Keyring related code a bit

* Appease Clippy

* Remove unused import

* Use keyring variants directly

* Remove unecessary From implementation

* make finality verifier pallet instantiable

* add second instance of finality verifier pallet to the Millau runtime

* add Westend -> Millau headers relay

* use wss to connect to public westend nodes

* initialize with best_finalized_block

* typo

* Revert "initialize with best_finalized_block"

This reverts commit 954ed283.

* pass VoterSet by ref

* new bridge initialization code

* loop upper bound

* Polkadot -> Westend

* fixed tests compilation

* default-features

* assert

* Remove unused Config types from `pallet-finality-verifier`

* Remove unused AncestryChecker trait

* Remove ancestry proof parameter from relayer calls

* Update docs to reflect current state of pallet

* Remove mock ancestry checker

* Remove unused error

* Write headers outside of function used for authority set changes

* Move justification verification into helper function

* Add documentation suggestions

Co-authored-by: Tomasz Drwięga <[email protected]>

* Clean up module level documentation a bit

Co-authored-by: Tomasz Drwięga <[email protected]>

* Make Substrate deps uniform

* Rest of the deps.

* Fix broken merge.

* Revert substrate.

* Fix tests

Co-authored-by: Pierre Krieger <[email protected]>

* finality proofs relay

* SyncHeader::is_mandatory

* empty ancestry proof

* logs

* fixed submit condition

* fixed wrong split index

* tick comment

* recent_finality_proofs

* basic finality loop tests

* removed obsolete files

* rename files in substrate relay

* fmt

* clippy

* fixed TODOs

* clippy

* stop syncing if target node is out of sync

* more clippy

* more clippy

* Update relays/finality-relay/src/finality_loop.rs

Co-authored-by: Hernando Castano <[email protected]>

* Update relays/finality-relay/src/finality_loop.rs

Co-authored-by: Hernando Castano <[email protected]>

* Update relays/finality-relay/src/finality_loop.rs

Co-authored-by: Hernando Castano <[email protected]>

* docs

* moved doc

* typo

* Update relays/finality-relay/src/finality_loop_tests.rs

Co-authored-by: Hernando Castano <[email protected]>

* Update relays/finality-relay/src/finality_loop_tests.rs

Co-authored-by: Hernando Castano <[email protected]>

* header_and_finality_proof_by_number -> header_and_finality_proof

* VecDeque isn't required (because of make_contiguous)

* fixed wrong expect

* Update relays/finality-relay/src/finality_loop.rs

Co-authored-by: Hernando Castano <[email protected]>

* Update relays/substrate/src/rialto_headers_to_millau.rs

Co-authored-by: Hernando Castano <[email protected]>

* Update relays/substrate/src/rialto_headers_to_millau.rs

Co-authored-by: Hernando Castano <[email protected]>

* RialtoSyncHeader

* Update relays/finality-relay/src/finality_loop.rs

Co-authored-by: Tomasz Drwięga <[email protected]>

* Update relays/finality-relay/src/finality_loop.rs

Co-authored-by: Tomasz Drwięga <[email protected]>

* removed wrong comment

* Update relays/finality-relay/src/finality_loop.rs

Co-authored-by: Tomasz Drwięga <[email protected]>

* fix used runtime methods names

* fix for new jsonrpsee

* fix comment

* initialize finality verifier pallet

* fmt

Co-authored-by: Hernando Castano <[email protected]>
Co-authored-by: Tomasz Drwięga <[email protected]>

* Use no-op ancestry checker

* Check that current header height is greater than last finalized

* Ensure that incoming headers are strictly greater than last finalized

* Ensure that header numbers always increase in tests

* Revert "Pin Rust Nightly to 2020-12-17 (#652)"

This reverts commit e54e6f7e.

* fix clippy

* clippy again

* more clippy in test code

* and new cargo fmt

* another try

* Bump substrate deps.

* Bump scale.

* Bump ethabi.

* Remove inherent from aura.

* Migrate to construct_runtime

* cargo fmt --all

* Make AncestryProof type more flexible

* Only import single finalized header instead of a chain

* Fix unchecked header import tests

* Add option for limiting ancestry proof size

* Update finality verifier Config in runtimes

* Update some documentation

* Fix Clippy warning

* Allow AncestryChecker to return proof size

Stops us from abusing the `Size` trait

* Remove Size impl for Vec<T>

* Remove size contraints for ancestry proofs

With different proof types its unclear how to "size" should be interpreted,
so we remove this requirement all together to avoid confusion.

* Add Finality Verifier pallet to runtimes

* Implement simple ancestry checker

* Use the new checker in runtimes

* Remove unused import warning

* Bump max allowed ancestry proof size

* Add a few optimization suggestions when verifying ancestry

* Use session length as upper bound for ancestry proof size

* Remove unused time units

* Add method for unchecked header imports

* Update docs for importing unchecked headers

* Import unchecked headers in HeaderChain implementation

* Fix Clippy warnings

* Move unchecked header import out of Verifier struct

* Clean up unchecked import tests

* Change HeaderChain API to accept iterator of headers

* Use chains of headers in tests

* Remove unused Result return type when appending finalized headers

* Add test which shows that genesis changes are not enacted

* Use initial header's hash for unchecked authority set changes

* Appease Clippy

* Check ancestry before making unchecked writes

* Fix typo

* Fix Clippy warning

* Add note about `ancestry_proof` structure

* Use best hash storage item directly

Co-authored-by: Svyatoslav Nikolsky <[email protected]>

* Add skeleton for `pallet-finality-verifier`

* Sketch out implementation for importing finality proofs

* Get pallet compiling

* Introduce skeleton for mock runtime

* Start using real Grandpa types in finality pallet

* Redefine types in header chain primitives crate

* Implement HeaderChain for Substrate bridge pallet

* Plug Substrate Bridge Pallet into verifier mock

* Fix compilation of `header-chain` primitives

* Start writing to base pallet storage

* Add first "cross-pallet" test

* Move keyring primitives used in tests to shared crate

* Stop pulling `std` deps into `no_std` builds

* Revert "Stop pulling `std` deps into `no_std` builds"

This reverts commit f74dd660.

* Revert "Move keyring primitives used in tests to shared crate"

This reverts commit b774fa73.

* Use new SS58Prefix type in mock

* Start using `bp-test-utils` in finality pallet

* Start using real justification code

* Get a test working with real justification verification

* Add basic tests for invalid proofs

* Get rid of AncestryProof config type

* Add error types to transaction outcome

* Bound number of headers allowed in a single ancestry proof

* Disallow invalid authority sets

* Remove unused items

* Add some documentation

* Get rid of Clippy warnings

* Rename BaseHeaderChain to TransactionVerifier

* Remove unused code

* Make dummy trait implementations more generic

* Fix more Clippy complaints

* Update tests to use fix for duplicate headers

* Fix benchmarking compilation

* Rename TransactionVerifier to InclusionProofVerifier

* Move justification module to header-chain primitives crate

* Get justification module compiling in new location

* Get justification module tests compiling

* Use justification code from `header-chain` crate

Mostly compiles, having issues with std/test feature flags across crates.

* Move some code around

* Move justification tests to integration testing crate

* Add `test-utils` crate

* Remove tests and test-helper module from justification code

* Use `test-utils` in Substrate bridge pallet tests

* Remove `sp-keyring` related code from `pallet-substrate-bridge`

* Remove `helpers` module from `pallet-substrate-bridge`

* Add some documentation

* Add more documentation

* Fix typo

Co-authored-by: Tomasz Drwięga <[email protected]>

Co-authored-by: Tomasz Drwięga <[email protected]>

* Add header-chain primitive crate

* Make MinimalHeaderChain functionaly the same as PeerBlockchain

* Use a better doc comment for MinimalHeaderChain

* Fix benchmark compilation

* Rust Fmt

* Remove Substrate based dependencies

* Rename MinimalHeaderChain to BaseHeaderChain