rlp::decode returns Result
Make a best effort to handle decoding errors gracefully throughout the code, using `expect` where the value is guaranteed to be valid (and in other places where it makes sense).
* Keep all enacted blocks notify in order
* Collect is unnecessary
* Update ChainNotify to use ChainRouteType
* Fix all ethcore fn defs
* Wrap the type within ChainRoute
* Fix private-tx and sync api
* Fix secret_store API
* Fix updater API
* Fix rpc api
* Fix informant api
* Eagerly cache enacted/retracted and remove contain_enacted/retracted
* Fix indent
* tests: should use full expr form for struct constructor
* Use into_enacted_retracted to further avoid copy
* typo: not a function
* rpc/tests: ChainRoute -> ChainRoute::new
* Consolidate crypto functionality in `ethcore-crypto`.
- Move `ecdh`/`ecies` modules to `ethkey`.
- Refactor `ethcore-crypto` to use file per module.
- Replace `subtle` with `ethcore_crypto::is_equal`.
- Add `aes_gcm` module to `ethcore-crypto`.
* Rename `aes::{encrypt,decrypt,decrypt_cbc}` ...
... to `aes::{encrypt_128_ctr,decrypt_128_ctr,decrypt_128_cbc}`.
* Add SHL, SHR, SAR opcodes
* Add have_bitwise_shifting schedule flag
* Add all EIP tests for SHL
* Add SHR implementation and tests
* Implement SAR and add tests
* Add eip145transition config param
* Change map_or to map_or_else when possible
* Don't panic in import_block if invalid rlp
* Remove redundant type annotation
* Replace RLP header view usage with safe decoding
Using the view will panic with invalid RLP. Here we use Rlp decoding directly which will return a `Result<_, DecoderError>`. While this path currently should not have any invalid RLP - it makes it safer if ever called with invalid RLP from other code paths.
* Pass on storage keys even if it is not modified
* typo: account and storage query
`to_pod_diff` builds both `touched_addresses` merge and storage keys merge.
* Fix tests
* Use state query directly because of suicided accounts
* Fix a RefCell borrow issue
* Add tests for unmodified storage trace
* Address grumbles
* typo: remove unwanted empty line
* ensure_cached compiles with the original signature
* Fetch logs by hash in blockchain database
* Fix tests
* Add unit test for branch block logs fetching
* Add docs that blocks must already be sorted
* Handle branch block cases properly
* typo: empty -> is_empty
* Remove return_empty_if_none by using a closure
* Use BTreeSet to avoid sorting again
* Move is_canon to BlockChain
* typo: pass value by reference
* Use loop and wrap inside blocks to simplify the code
Borrowed from https://github.com/paritytech/parity/pull/8463#discussion_r183453326
* typo: missed a comment
* Update wasmi to 0.2
New wasmi supports 32bit platforms and no longer requires a special feature to build for such platforms.
* Update pwasm-utils to 0.1.5
* Improve VM executor stack size estimation rules
* typo: docs add "(Debug build)" comment
* Fix an off by one typo and set minimal stack size
This avoids the case if `depth_threshold == max_depth`. Usually setting stack size to zero will just rebound it to
platform minimal stack size, but we set it here just in case.
* Use saturating_sub to avoid potential overflow
* Some tiny modifications.
1. fix some typo in the comment.
2. sort the order of methods in 'impl state::Backend for StateDB`
* Remove the clone of code_cache, as it has been done in clone_basic.
* remove From::from. It seems not necessary.
* WIP
* Convert Ethcore error to use error_chain
* Use error_chain for ImportError and BlockImportError
* Fix error pattern matches for error_chain in miner
* Implement explicit From for AccountsError
* Fix pattern matches for ErrorKinds
* Handle ethcore error_chain in light client
* Explicitly define Result type to avoid shadowing
* Fix remaining Error pattern matches
* Fix tab space formatting
* Helps if the tests compile
* Fix error chain matching after merge
* WIP
* Replace Rlp with UntrustedRlp in views, explicity unwrap with expect
First pass to get it to compile. Need to figure out whether to do this or to propogate Errors upstream, which would require many more changes to dependent code. If we do this way we are assuming that the views are always used in a context where the rlp is trusted to be valid e.g. when reading from our own DB. So need to fid out whether views are used with data received from an untrusted (e.g. extrernal peer).
* Remove original Rlp impl, rename UntrustedRlp -> Rlp
* Create rlp views with view! macro to record debug info
Views are assumed to be over valid rlp, so if there is a decoding error we record where the view was created in the first place and report it in the expect
* Use $crate in view! macro to avoid import, fix tests
* Expect valid rlp in decode functions for now
* Replace spaces with tabs in new file
* Add doc tests for creating views with macro
* Update rlp docs to reflect removing of UntrustedRlp
* Replace UntrustedRlp usages in private-tx merge
* secret_store: remove kvdb_rocksdb dependency
* cli: init db mod for open dispatch
* cli: move db, client_db, restoration_db, secretstore_db to a separate mod
* migration: rename to migration-rocksdb and remove ethcore-migrations
* ethcore: re-move kvdb-rocksdb dep to test
* mark test_helpers as test only and fix migration mod naming
* Move restoration_db_handler to test_helpers_internal
* Fix missing preambles in test_helpers_internal and rocksdb/helpers
* Move test crates downward
* Fix missing docs
* cli, db::open_db: move each argument to a separate line
* Use featuregate instead of dead code for `open_secretstore_db`
* Move pathbuf import to open_secretstore_db
Because it's only used there behind a feature gate
* Implementation of Verifier, Scoring and Ready.
* Queue in progress.
* TransactionPool.
* Prepare for txpool release.
* Miner refactor [WiP]
* WiP reworking miner.
* Make it compile.
* Add some docs.
* Split blockchain access to a separate file.
* Work on miner API.
* Fix ethcore tests.
* Refactor miner interface for sealing/work packages.
* Implement next nonce.
* RPC compiles.
* Implement couple of missing methdods for RPC.
* Add transaction queue listeners.
* Compiles!
* Clean-up and parallelize.
* Get rid of RefCell in header.
* Revert "Get rid of RefCell in header."
This reverts commit 0f2424c9b7319a786e1565ea2a8a6d801a21b4fb.
* Override Sync requirement.
* Fix status display.
* Unify logging.
* Extract some cheap checks.
* Measurements and optimizations.
* Fix scoring bug, heap size of bug and add cache
* Disable tx queueing and parallel verification.
* Make ethcore and ethcore-miner compile again.
* Make RPC compile again.
* Bunch of txpool tests.
* Migrate transaction queue tests.
* Nonce Cap
* Nonce cap cache and tests.
* Remove stale future transactions from the queue.
* Optimize scoring and write some tests.
* Simple penalization.
* Clean up and support for different scoring algorithms.
* Add CLI parameters for the new queue.
* Remove banning queue.
* Disable debug build.
* Change per_sender limit to be 1% instead of 5%
* Avoid cloning when propagating transactions.
* Remove old todo.
* Post-review fixes.
* Fix miner options default.
* Implement back ready transactions for light client.
* Get rid of from_pending_block
* Pass rejection reason.
* Add more details to drop.
* Rollback heap size of.
* Avoid cloning hashes when propagating and include more details on rejection.
* Fix tests.
* Introduce nonces cache.
* Remove uneccessary hashes allocation.
* Lower the mem limit.
* Re-enable parallel verification.
* Add miner log. Don't check the type if not below min_gas_price.
* Add more traces, fix disabling miner.
* Fix creating pending blocks twice on AuRa authorities.
* Fix tests.
* re-use pending blocks in AuRa
* Use reseal_min_period to prevent too frequent update_sealing.
* Fix log to contain hash not sender.
* Optimize local transactions.
* Fix aura tests.
* Update locks comments.
* Get rid of unsafe Sync impl.
* Review fixes.
* Remove excessive matches.
* Fix compilation errors.
* Use new pool in private transactions.
* Fix private-tx test.
* Fix secret store tests.
* Actually use gas_floor_target
* Fix config tests.
* Fix pool tests.
* Address grumbles.
* parity-reactor: Pass over Handle in spawning fn to allow normal tokio ops
* Allow fetch to work with arbitrary requests
* typo: Fix missing handler closure
* miner, work_notify: use fetch and parity-reactor
* Fix work_notify pushing in parity CLI
* Private transaction message added
* Empty line removed
* Private transactions logic removed from client into the separate module
* Fixed compilation after merge with head
* Signed private transaction message added as well
* Comments after the review fixed
* Private tx execution
* Test update
* Renamed some methods
* Fixed some tests
* Reverted submodules
* Fixed build
* Private transaction message added
* Empty line removed
* Private transactions logic removed from client into the separate module
* Fixed compilation after merge with head
* Signed private transaction message added as well
* Comments after the review fixed
* Encrypted private transaction message and signed reply added
* Private tx execution
* Test update
* Main scenario completed
* Merged with the latest head
* Private transactions API
* Comments after review fixed
* Parameters for private transactions added to parity arguments
* New files added
* New API methods added
* Do not process packets from unconfirmed peers
* Merge with ptm_ss branch
* Encryption and permissioning with key server added
* Fixed compilation after merge
* Version of Parity protocol incremented in order to support private transactions
* Doc strings for constants added
* Proper format for doc string added
* fixed some encryptor.rs grumbles
* Private transactions functionality moved to the separate crate
* Refactoring in order to remove late initialisation
* Tests fixed after moving to the separate crate
* Fetch method removed
* Sync test helpers refactored
* Interaction with encryptor refactored
* Contract address retrieving via substate removed
* Sensible gas limit for private transactions implemented
* New private contract with nonces added
* Parsing of the response from key server fixed
* Build fixed after the merge, native contracts removed
* Crate renamed
* Tests moved to the separate directory
* Handling of errors reworked in order to use error chain
* Encodable macro added, new constructor replaced with default
* Native ethabi usage removed
* Couple conversions optimized
* Interactions with client reworked
* Errors omitting removed
* Fix after merge
* Fix after the merge
* private transactions improvements in progress
* private_transactions -> ethcore/private-tx
* making private transactions more idiomatic
* private-tx encryptor uses shared FetchClient and is more idiomatic
* removed redundant tests, moved integration tests to tests/ dir
* fixed failing service test
* reenable add_notify on private tx provider
* removed private_tx tests from sync module
* removed commented out code
* Use plain password instead of unlocking account manager
* remove dead code
* Link to the contract changed
* Transaction signature chain replay protection module created
* Redundant type conversion removed
* Contract address returned by private provider
* Test fixed
* Addressing grumbles in PrivateTransactions (#8249)
* Tiny fixes part 1.
* A bunch of additional comments and todos.
* Fix ethsync tests.
* resolved merge conflicts
* final private tx pr (#8318)
* added cli option that enables private transactions
* fixed failing test
* fixed failing test
* fixed failing test
* fixed failing test
* Move client DB opening logic to CLI
* Move restoration db open logic to CLI
This adds KeyValueDBHandler which handles opening a new database, thus allow us to move the restoration db open logic
out of ethcore.
* Move rocksdb's compactionprofile conversion to CLI
* Move kvdb_rocksdb as test dependency for ethcore
* Fix tests due to interface change
* Fix service tests
* Remove unused migration dep for ethcore
* Some tiny modifications.
1. fix some typo in the comment.
2. sort the order of methods in 'impl state::Backend for StateDB`
* Remove the clone of code_cache, as it has been done in clone_basic.
* updater: refactor updater flow into state machine
* updater: delay update randomly within max range
* updater: configurable update delay
* updater: split polling and updater state machine step
* updater: drop state to avoid deadlocking
* updater: fix fetch backoff
* updater: fix overflow in update delay calculation
* updater: configurable update check frequency
* updater: fix update policy frequency comparison
* updater: use lazy_static for platform and platform_id_hash
* updater: refactor operations contract calls into OperationsClient
* updater: make updater generic over operations and fetch client
* updater: fix compilation
* updater: add testing infrastructure and minimal test
* updater: fix minor grumbles
* updater: add test for successful updater flow
* updater: add test for update delay
* updater: add test for update check frequency
* updater: mock time and rng for deterministic tests
* updater: test backoff on failure
* updater: add test for backoff short-circuit on new release
* updater: refactor to increase readability
* updater: cap maximum backoff to one month
* updater: add test for detecting already downloaded update
* updater: add test for updater disable on fatal errors
* updater: add test for pending outdated fetch
* updater: test auto install of updates
* updater: add test for capability updates
* updater: fix capability update
* updater: use ethabi to create event topic filter
* updater: decrease maximum backoff to 1 day
* updater: cap maximum update delay with upcoming fork block number
* updater: receive state mutex guard in updater_step
* updater: overload execute_upgrade to take state mutex guard
* updater: remove unnecessary clone of latest operations info
* updater: remove latest operations info clone when triggering fetch
* Replace Rlp with UntrustedRlp and unsafely unwrap
All Rlp methods return Result<_,DecoderError> now, so for this first
pass each will be marked with `expect("TODO")`. In the next pass we can
categorise figure out how to handle each case.
* Handle DecoderError for tendermint message
* Unwrap rlp results in TestBlockcChainClient
Rlp should be valid since created manually in tests
* Replace `use rlp::*` with explicit imports
* Remove rlp decode unwraps from light cli request
* Structured rlp encoding for curr best and latest in header chain
* Propogate decoder errors from send_packet
* Fix body uncles rlp index
* Use BodyView in sync and `expect` rlp errors
* Revert bbf28f removing original Rlp for this phase
This can be done again in the next phase, in order that we can leave the ethcore views unchanged
* Restore legacy Rlp and UntrustedRlp
Use legacy Rlp for ethcore views. Will redo replacing Rlp with UntrustedRlp in a subsequent PR
* Fix tests
* Replace boilerplate Encodable/Decodable with derive
* Use BlockView instead of Rlp, remove unwrap
* Remove rlp test_cli unwraps by using BlockView instead of Rlp directly
* Remove unneccesary change to use borrowed hash
* Construct sync block using new_from_header_and_body
* Very primitive test of the Client API
* [WIP] getting rid of request
* Add support for redirects.
* Remove CpuPool from `fetch::Client`.
* Adapt code to API changes and fix tests.
* Use reference counter to stop background thread.
On `clone` the counter is incremented, on `drop` decremented. Once 0 we
send `None` over the channel, expecting the background thread to end.
* Fix tests.
* Comment.
* Change expect messages.
* Use local test server for testing fetch client.
* Ensure max_size also in BodyReader.
* Replace `Condvar` with `sync_channel`.
* Re-export `url::Url` from `fetch` crate.
* Remove spaces.
* Use random ports in local test server.
* Improves `BestBlock` comment
* Improves `TraceDB` comment
* Improves `journaldb::Algorithm` comment.
Probably the whole enum should be renamed to `Strategy` or something alike.
* Comments some of the `Client`'s fields
* Deglobs client imports
* Fixes comments
* Extracts `import_lock` to `Importer` struct
* Extracts `verifier` to `Importer` struct
* Extracts `block_queue` to `Importer` struct
* Extracts `miner` to `Importer` struct
* Extracts `ancient_verifier` to `Importer` struct
* Extracts `rng` to `Importer` struct
* Extracts `import_old_block` to `Importer` struct
* Adds `Nonce` trait
* Adds `Balance` trait
* Adds `ChainInfo` trait
* Fixes imports for tests using `chain_info` method
* Adds `BlockInfo` trait
* Adds more `ChainInfo` imports
* Adds `BlockInfo` imports
* Adds `ReopenBlock` trait
* Adds `PrepareOpenBlock` trait
* Fixes import in tests
* Adds `CallContract` trait
* Fixes imports in tests using `call_contract` method
* Adds `TransactionInfo` trait
* Adds `RegistryInfo` trait
* Fixes imports in tests using `registry_address` method
* Adds `ScheduleInfo` trait
* Adds `ImportSealedBlock` trait
* Fixes imports in test using `import_sealed_block` method
* Adds `BroadcastProposalBlock` trait
* Migrates `Miner` to static dispatch
* Fixes tests
* Moves `calculate_enacted_retracted` to `Importer`
* Moves import-related methods to `Importer`
* Removes redundant `import_old_block` wrapper
* Extracts `import_block*` into separate trait
* Fixes tests
* Handles `Pending` in `LightFetch`
* Handles `Pending` in filters
* Handles `Pending` in `ParityClient`
* Handles `Pending` in `EthClient`
* Removes `BlockId::Pending`, partly refactors dependent code
* Adds `StateInfo` trait
* Exports `StateOrBlock` and `BlockChain` types from `client` module
* Refactors `balance` RPC using generic API
* Refactors `storage_at` RPC using generic API
* Makes `MinerService::pending_state`'s return type dynamic
* Adds `StateOrBlock` and `BlockChain` types
* Adds impl of `client::BlockChain` for `Client`
* Exports `StateInfo` trait from `client` module
* Missing `self` use
To be fixed up to "Adds impl of `client::BlockChain` for `Client`"
* Adds `number_to_id` and refactors dependent RPC methods
* Refactors `code_at` using generic API
* Adds `StateClient` trait
* Refactors RPC to use `StateClient` trait
* Reverts `client::BlockChain` trait stuff, refactors methods to accept `StateOrBlock`
* Refactors TestClient
* Adds helper function `block_number_to_id`
* Uses `block_number_to_id` instead of local function
* Handles `Pending` in `list_accounts` and `list_storage_keys`
* Attempt to use associated types for state instead of trait objects
* Simplifies `state_at_beginning`
* Extracts `call` and `call_many` into separate trait
* Refactors `build_last_hashes` to accept reference
* Exports `Call` type from the module
* Refactors `call` and `call_many` to accept state and header
* Exports `state_at` in `StateClient`
* Exports `pending_block_header` from `MinerService`
* Refactors RPC `call` method using new API
* Adds missing parentheses
* Refactors `parity::call` to use new call API
* Update .gitlab-ci.yml
fix gitlab lint
* Fixes error handling
* Refactors `traces::call` and `call_many` to use new call API
* Refactors `call_contract`
* Refactors `block_header`
* Refactors internal RPC method `block`
* Moves `estimate_gas` to `Call` trait, refactors parameters
* Refactors `estimate_gas` in RPC
* Refactors `uncle`
* Refactors RPC `transaction`
* Covers missing branches
* Makes it all compile, fixes compiler grumbles
* Adds casts in `blockchain` module
* Fixes `PendingBlock` tests, work on `MinerService`
* Adds test stubs for StateClient and EngineInfo
* Makes `state_db` public
* Adds missing impls for `TestBlockChainClient`
* Adds trait documentation
* Adds missing docs to the `state_db` module
* Fixes trivial compilation errors
* Moves `code_hash` method to a `BlockInfo` trait
* Refactors `Verifier` to be generic over client
* Refactors `TransactionFilter` to be generic over client
* Refactors `Miner` and `Client` to reflect changes in verifier and txfilter API
* Moves `ServiceTransactionChecker` back to `ethcore`
* Fixes trait bounds in `Miner` API
* Fixes `Client`
* Fixes lifetime bound in `FullFamilyParams`
* Adds comments to `FullFamilyParams`
* Fixes imports in `ethcore`
* Fixes BlockNumber handling in `code_at` and `replay_block_transactions`
* fix compile issues
* First step to redundant trait merge
* Fixes compilation error in RPC tests
* Adds mock `State` as a stub for `TestClient`
* Handles `StateOrBlock::State` in `TestBlockChainClient::balance`
* Fixes `transaction_count` RPC
* Fixes `transaction_count`
* Moves `service_transaction.json` to the `contracts` subfolder
* Fixes compilation errors in tests
* Refactors client to use `AccountData`
* Refactors client to use `BlockChain`
* Refactors miner to use aggregate traits
* Adds `SealedBlockImporter` trait
* Refactors miner to use `SealedBlockImporter` trait
* Removes unused imports
* Simplifies `RegistryInfo::registry_address`
* Fixes indentation
* Removes commented out trait bound
* aura: broadcast empty step message instead of sealing empty block
* aura: add empty_step messages to seal
* aura: include parent_hash in empty step message
* aura: verify received empty step messages
* aura: verify empty step messages in block
* aura: fix dead lock on empty_steps
* aura: fix EmptyStep Encodable
* aura: take number of empty steps into account in chain score
* aura: use empty step signers for finality
* aura: add empty "empty step" messages to seal when reading from spec
* aura: fix EmptyStep rlp encoding
* aura: use Vec<u8> instead of Bytes
* aura: fix block empty step verification
* Update .gitlab-ci.yml
fix lint
* aura: fix accumulation of empty step signatures for finality
* aura: include empty steps in seal signature
* aura: configurable max number of empty steps
* engine: pass block header to seal_fields method
This is necessary to make the number of seal fields dynamic,
e.g. activating a transition on a certain block number that changes
the seal.
* aura: add transition to enable empty step messages
* aura: clear old empty step messages on verify_block_external
* aura: ignore empty step messages from the future
* aura: report skipped primaries when empty steps are not enabled
* aura: fix tests
* aura: report misbehavior
* aura: add tests for rolling finality with multiple signatures
* engine: fix validator set test
In this test the block validation wasn't failing because the block was in the
future (expected failure) but was instead failing because the author of the
block isn't the expected authority. Since we added reporting of blocks produced
by the wrong authority this test started failing.
* aura: reward all the authors of empty step messages
* aura: fix reward attribution for new blocks
* aura: add tests for empty steps broadcasting and inclusion in blocks
* aura: reduce size of empty step messages in seal
* aura: add test for empty step inclusion in blocks
* aura: add test for rewarding of empty steps
* aura: add test for empty steps validation
* aura: fix rlp encoding of sealed empty step
* aura: fix grumbles
* rpc: generate new account id for imported wallets
* ethstore: handle duplicate wallet filenames
* ethstore: simplify deduplication of wallet file names
* ethstore: do not dedup wallet filenames on update
* ethstore: fix minor grumbles
* Refactor updater to use ethabi-derive
* Grumble: do_call type alias
* Empty commit to trigger test re-run
* migration to ethabi-5.0
* migration to ethabi-5.0 in progress
* use ethabi_deriven to generate TransactAcl contract
* use ethabi_deriven to generate Registry contract
* hash-fetch uses ethabi_derive, removed retain cycle from updater, fixed#7720
* node-filter crate uses ethabi_derive to generate peer_set contract interface
* use LruCache in node-filter instead of HashMap
* validator_set engine uses ethabi_derive
* ethcore does not depend on native_contracts
* miner does no depend on native_contracts
* secret_store does not use native_contracts (in progress)
* removed native-contracts
* ethcore and updater does not depend on futures
* updated ethereum-types
* fixed all warnings caused by using new version of ethereum-types
* updated ethabi_derive && ethabi_contract to get rid of warnings
* removed another retain cycle in updater, fixed following minor version on update
* moved contracts out of native_contracts res
* updated ethabi_contract
* fixed failing test
* fixed failing test
* there is no need to create two contracts of the same kind any more
* simplify updater::ReleaseTrack conversion into u8 and add several tests for it
* applied review suggestions
* applied review suggestions
* updated ethereum-types and tiny-keccak
* Updated several deps
* Updated several more dependencies
* Modify dummy file to trigger ci
* fixed update of memmap to 0.6 in ethash crate
* Fixed fetch after update to latest reqwest
* Updated jsonrpc-core with fixes for serde
* add expects in util/version/build.rs
* Move miner away from ethcore.
* Fix ethcore to use miner/transaction.
* Fix tests and warnings.
* fixed incorrect merge of the test in the documentation
* kvdb-rocksdb: update to RocksDB 5.8.8
* kvdb-rocksdb: tune RocksDB options
* Switch to level-style compaction
* Increase default block size (16K), and use bigger blocks for HDDs (64K)
* Increase default file size base (64MB SSDs, 256MB HDDs)
* Create a single block cache shared across all column families
* Tune compaction settings using RocksDB helper functions, taking into account
memory budget spread across all columns
* Configure backgrounds jobs based on the number of CPUs
* Set some default recommended settings
* ethcore: remove unused config blockchain.db_cache_size
* parity: increase default value for db_cache_size
* kvdb-rocksdb: enable compression on all levels
* kvdb-rocksdb: set global db_write_bufer_size
* kvdb-rocksdb: reduce db_write_bufer_size to force earlier flushing
* kvdb-rocksdb: use master branch for rust-rocksdb dependency
* created the dir crate in util
* moved code from ethstore/src/dir/paths.rs to dir crate
* rename dir module in ethstore to accounts_dir to distinguish it
from the dir crate
* changes after @tomusdrw on #6952
* parity-version module split from util
removed unused util deps and features
trigger buildbot again
only kvdb links rocksdb
snappy linker issues
* rm snappy
* fixed old version imports
Firstly, `Step.duration_remaining` casts it to u32, unnecesarily
limiting it to 2^32. While theoretically this is "good enough" (at 3
seconds steps it provides room for a little over 400 years), it is
still a lossy way to calculate the remaining time until the next step.
Secondly, step duration might be zero, triggering division by zero
in `Step.calibrate`
Solution: rework the code around the fact that duration is
typically in single digits and never grows, hence, it can be represented
by a much narrower range (u16) and this highlights the fact that
multiplying u64 by u16 will only result in an overflow in even further
future, at which point we should panic informatively (if anybody's
still around)
Similarly, panic when it is detected that incrementing the step
counter wrapped around on the overflow of usize.
As for the division by zero, prevent it by making zero an invalid
value for step duration. This will make AuRa log the constraint
mismatch and panic (after all, what purpose would zero step duration
serve? it makes no sense within the definition of the protocol,
as finality can only be achieved as per the specification
if messages are received within the step duration, which would violate
the speed of light and other physical laws in this case).
