* Add client-traits crate
Move the BlockInfo trait to new crate
* New crate `machine`
Contains code extracted from ethcore that defines `Machine`, `Externalities` and other execution related code.
* Use new machine and client-traits crates in ethcore
* Use new crates machine and client-traits instead of ethcore where appropriate
* Fix tests
* Don't re-export so many types from ethcore::client
* Fixing more fallout from removing re-export
* fix test
* More fallout from not re-exporting types
* Add some docs
* cleanup
* import the macro edition style
* Tweak docs
* Add missing import
* remove unused ethabi_derive imports
* Use latest ethabi-contract
* Move many traits from ethcore/client/traits to client-traits crate
Initial version of extracted Engine trait
* Move snapshot related traits to the engine crate (eew)
* Move a few snapshot related types to common_types
Cleanup Executed as exported from machine crate
* fix warning
* Gradually introduce new engine crate: snapshot
* ethcore typechecks with new engine crate
* Sort out types outside ethcore
* Add an EpochVerifier to ethash and use that in Engine.epoch_verifier()
Cleanup
* Document pub members
* Sort out tests
Sort out default impls for EpochVerifier
* Add test-helpers feature and move EngineSigner impl to the right place
* Sort out tests
* Sort out tests and refactor verification types
* Fix missing traits
* More missing traits
Fix Histogram
* Fix tests and cleanup
* cleanup
* Put back needed logger import
* Don't rexport common_types from ethcore/src/client
Don't export ethcore::client::*
* Remove files no longer used
Use types from the engine crate
Explicit exports from engine::engine
* Get rid of itertools
* Move a few more traits from ethcore to client-traits: BlockChainReset, ScheduleInfo, StateClient
* Move ProvingBlockChainClient to client-traits
* Don't re-export ForkChoice and Transition from ethcore
* Address grumbles: sort imports, remove commented out code
* Fix merge resolution error
* Extract the Clique engine to own crate
* Extract NullEngine and the block_reward module from ethcore
* Extract InstantSeal engine to own crate
* Extract remaining engines
* Extract executive_state to own crate so it can be used by engine crates
* Remove snapshot stuff from the engine crate
* Put snapshot traits back in ethcore
* cleanup
* Remove stuff from ethcore
* Don't use itertools
* itertools in aura is legit-ish
* More post-merge fixes
* Re-export less types in client
* cleanup
* Extract spec to own crate
* Put back the test-helpers from basic-authority
* Fix ethcore benchmarks
* Reduce the public api of ethcore/verification
* Update ethcore/block-reward/Cargo.toml
Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* Update ethcore/engines/basic-authority/Cargo.toml
Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* Update ethcore/engines/ethash/Cargo.toml
Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* Update ethcore/engines/clique/src/lib.rs
Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* signers is already a ref
* Add an EngineType enum to tighten up Engine.name()
* Introduce Snapshotting enum to distinguish the type of snapshots a chain uses
* Rename supports_warp to snapshot_mode
* Missing import
* Update ethcore/src/snapshot/consensus/mod.rs
Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* missing import
* Fix import
* double semi
* Add client-traits crate
Move the BlockInfo trait to new crate
* New crate `machine`
Contains code extracted from ethcore that defines `Machine`, `Externalities` and other execution related code.
* Use new machine and client-traits crates in ethcore
* Use new crates machine and client-traits instead of ethcore where appropriate
* Fix tests
* Don't re-export so many types from ethcore::client
* Fixing more fallout from removing re-export
* fix test
* More fallout from not re-exporting types
* Add some docs
* cleanup
* import the macro edition style
* Tweak docs
* Add missing import
* remove unused ethabi_derive imports
* Use latest ethabi-contract
* Move many traits from ethcore/client/traits to client-traits crate
Initial version of extracted Engine trait
* Move snapshot related traits to the engine crate (eew)
* Move a few snapshot related types to common_types
Cleanup Executed as exported from machine crate
* fix warning
* Gradually introduce new engine crate: snapshot
* ethcore typechecks with new engine crate
* Sort out types outside ethcore
* Add an EpochVerifier to ethash and use that in Engine.epoch_verifier()
Cleanup
* Document pub members
* Sort out tests
Sort out default impls for EpochVerifier
* Add test-helpers feature and move EngineSigner impl to the right place
* Sort out tests
* Sort out tests and refactor verification types
* Fix missing traits
* More missing traits
Fix Histogram
* Fix tests and cleanup
* cleanup
* Put back needed logger import
* Don't rexport common_types from ethcore/src/client
Don't export ethcore::client::*
* Remove files no longer used
Use types from the engine crate
Explicit exports from engine::engine
* Get rid of itertools
* Move a few more traits from ethcore to client-traits: BlockChainReset, ScheduleInfo, StateClient
* Move ProvingBlockChainClient to client-traits
* Don't re-export ForkChoice and Transition from ethcore
* Address grumbles: sort imports, remove commented out code
* Fix merge resolution error
* Extract the Clique engine to own crate
* Extract NullEngine and the block_reward module from ethcore
* Extract InstantSeal engine to own crate
* Extract remaining engines
* Extract executive_state to own crate so it can be used by engine crates
* Remove snapshot stuff from the engine crate
* Put snapshot traits back in ethcore
* cleanup
* Remove stuff from ethcore
* Don't use itertools
* itertools in aura is legit-ish
* More post-merge fixes
* Re-export less types in client
* cleanup
* Update ethcore/block-reward/Cargo.toml
Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* Update ethcore/engines/basic-authority/Cargo.toml
Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* Update ethcore/engines/ethash/Cargo.toml
Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* Update ethcore/engines/clique/src/lib.rs
Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* signers is already a ref
* Add an EngineType enum to tighten up Engine.name()
* Introduce Snapshotting enum to distinguish the type of snapshots a chain uses
* Rename supports_warp to snapshot_mode
* Missing import
* Update ethcore/src/snapshot/consensus/mod.rs
Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
* remove double-semicolons
* Add client-traits crate
Move the BlockInfo trait to new crate
* New crate `machine`
Contains code extracted from ethcore that defines `Machine`, `Externalities` and other execution related code.
* Use new machine and client-traits crates in ethcore
* Use new crates machine and client-traits instead of ethcore where appropriate
* Fix tests
* Don't re-export so many types from ethcore::client
* Fixing more fallout from removing re-export
* fix test
* More fallout from not re-exporting types
* Add some docs
* cleanup
* import the macro edition style
* Tweak docs
* Add missing import
* remove unused ethabi_derive imports
* Use latest ethabi-contract
* Move many traits from ethcore/client/traits to client-traits crate
Initial version of extracted Engine trait
* Move snapshot related traits to the engine crate (eew)
* Move a few snapshot related types to common_types
Cleanup Executed as exported from machine crate
* fix warning
* Gradually introduce new engine crate: snapshot
* ethcore typechecks with new engine crate
* Sort out types outside ethcore
* Add an EpochVerifier to ethash and use that in Engine.epoch_verifier()
Cleanup
* Document pub members
* Sort out tests
Sort out default impls for EpochVerifier
* Add test-helpers feature and move EngineSigner impl to the right place
* Sort out tests
* Sort out tests and refactor verification types
* Fix missing traits
* More missing traits
Fix Histogram
* Fix tests and cleanup
* cleanup
* Put back needed logger import
* Don't rexport common_types from ethcore/src/client
Don't export ethcore::client::*
* Remove files no longer used
Use types from the engine crate
Explicit exports from engine::engine
* Get rid of itertools
* Move a few more traits from ethcore to client-traits: BlockChainReset, ScheduleInfo, StateClient
* Move ProvingBlockChainClient to client-traits
* Don't re-export ForkChoice and Transition from ethcore
* Address grumbles: sort imports, remove commented out code
* Fix merge resolution error
* merge failure
* Add client-traits crate
Move the BlockInfo trait to new crate
* New crate `machine`
Contains code extracted from ethcore that defines `Machine`, `Externalities` and other execution related code.
* Use new machine and client-traits crates in ethcore
* Use new crates machine and client-traits instead of ethcore where appropriate
* Fix tests
* Don't re-export so many types from ethcore::client
* Fixing more fallout from removing re-export
* fix test
* More fallout from not re-exporting types
* Add some docs
* cleanup
* import the macro edition style
* Tweak docs
* Add missing import
* remove unused ethabi_derive imports
* Use latest ethabi-contract
* WIP move errors, pod_account and state account to own crates
* Sort out dependencies, fix broken code and tests
Remove botched ethcore-error crate
* remove template line
* fix review feedback
* Remove test-only AccountDBMut::new
* Extract AccountDB to account-db
* Move Substate to state-account – wip
* Add lib.rs
* cleanup
* test failure
* test failure 2
* third time's the charm
* Add factories crate
* Use new factories crate
* Use factories crate
* Extract trace
* Fix tests
* Sort out parity-util-mem and parking_lot
* cleanup
* WIP port over the rest of state from ethcore
* Collect all impls for Machine
* some notes
* Rename pod-account to pod
* Move PodState to pod crate
* Use PodState from pod crate
* Fix use clause for json tests
* Sort out evmbin
* Add missing code and use PodState
* Move code that depends on Machine and Executive to own module
* Sort out cloning errors, fix ethcore to use new state crate
* Do without funky From impls
* Fix ethcore tests
* Fixes around the project to use new state crate
* Add back the more specific impls of StateOrBlock From conversions
* Move execute to freestanding function and remove it from trait
Sort out the error handling in executive_state by moving the result types from state to ethcore
Undo the verbose code added to work around the StateOrBlock From conversions
* cleanup
* Fix "error: enum variants on type aliases are experimental"
* Bring back the state tests
Fix whitespace
* remove ethcore/state/mod.rs
* cleanup
* cleanup
* Cleanup state-account errors
* Fix more todos
Add module docs
* Add error.rs
* Fixup Cargo.lock
* Smaller ethcore API is fine
* Add `to-pod-full` feature to state-account
Fix evmbin
* Fix a few more test failures
* Fix RPC test build
* Baptize the new trait
* Remove resolved TODOs
* Rename state-account to account-state
* Do not re-export the trace crate
* Don't export state_db from ethcore
* Let private-tx use StateDB. :(
* Remove ethcore/src/pod_state.rs
* Inner type does not need to be pub/pub(crate)
* optimise imports
* Revert "Inner type does not need to be pub/pub(crate)"
This reverts commit 2f839f8a0f72f71334da64620f57e6dd6039f06b.
* Move DatabaseExtras to ethcore-blockchain
* Add database_extra module to ethcore-blockchain
* Remove to-pod-full feature
* cosmetics
* New crate: state-db
* Add new crate
* Move PreverifiedBlock and BlockError to types
* Sort out the merge
* Add missing `license` meta data keys
* wip
* wip client-traits
* merge conflict
* verification crate type checks
* Move impls for CommonParams to common_types
Fix misc stuff in ethcore
* Fix tests
* Implement VerifyingEngine for all engines except Ethash
Temporarily sort out error handling
Move more types to common_types
* Split Engine in two and move code around
* cleanup
* verification: don't rexport common_types
* Use error from common_types
* Consolidate error types
* VerifyingEngine use Errors from common_types
* verification: Use error type from common_types
* SnapshotError moved to common_types
* Move more code from Engne to VerifyingEngine
Add a VerifyingClient trait: BlockInfo + CallContract
Whitespace
* Add MAX_UNCLE_AGE const
* Port over remaining code from ethcore/verification
* Use errors from common_types
* Fix the confusing "io" naming
* Move more types into common_types
* Add todos
* Experiment with Engine trait outside ethcore
* Hook up types from common_types in ethcore
Don't use verification crate
Don't use client-traits crate
* Revert to impl Engine for Arc<Ethash> and add note to explain why
Revert moving ClientIoMessage to common_types
Fix build
* Remove ClientIoMessage from common_types
* Cleanup
* More cleanup
* Sort error handling changes in the rest of parity
* Remove unused code
* Remove WIP types
* Cleanup todos not tackled here
* remove cruft
* Fix some whitespace and a merge error
* ethcore tests
* test failures
* Restore Engine impls to master to make review a bit easier
* cleanup
* whitespace
* applied review suggestions
* types does not depend on rustc-hex
* ethash engine moved to engine module
* applied review suggestion
* WIP move errors, pod_account and state account to own crates
* Sort out dependencies, fix broken code and tests
Remove botched ethcore-error crate
* remove template line
* fix review feedback
* Remove test-only AccountDBMut::new
* Extract AccountDB to account-db
* Move Substate to state-account – wip
* Add lib.rs
* cleanup
* test failure
* test failure 2
* third time's the charm
* Add factories crate
* Use new factories crate
* Use factories crate
* Extract trace
* Fix tests
* Sort out parity-util-mem and parking_lot
* cleanup
* WIP port over the rest of state from ethcore
* Collect all impls for Machine
* some notes
* Rename pod-account to pod
* Move PodState to pod crate
* Use PodState from pod crate
* Fix use clause for json tests
* Sort out evmbin
* Add missing code and use PodState
* Move code that depends on Machine and Executive to own module
* Sort out cloning errors, fix ethcore to use new state crate
* Do without funky From impls
* Fix ethcore tests
* Fixes around the project to use new state crate
* Add back the more specific impls of StateOrBlock From conversions
* Move execute to freestanding function and remove it from trait
Sort out the error handling in executive_state by moving the result types from state to ethcore
Undo the verbose code added to work around the StateOrBlock From conversions
* cleanup
* Fix "error: enum variants on type aliases are experimental"
* Bring back the state tests
Fix whitespace
* remove ethcore/state/mod.rs
* cleanup
* cleanup
* Cleanup state-account errors
* Fix more todos
Add module docs
* Add error.rs
* Fixup Cargo.lock
* Smaller ethcore API is fine
* Add `to-pod-full` feature to state-account
Fix evmbin
* Fix a few more test failures
* Fix RPC test build
* Baptize the new trait
* Remove resolved TODOs
* Rename state-account to account-state
* Do not re-export the trace crate
* Don't export state_db from ethcore
* Let private-tx use StateDB. :(
* Remove ethcore/src/pod_state.rs
* Inner type does not need to be pub/pub(crate)
* optimise imports
* Revert "Inner type does not need to be pub/pub(crate)"
This reverts commit 2f839f8a0f72f71334da64620f57e6dd6039f06b.
* Move DatabaseExtras to ethcore-blockchain
* Add database_extra module to ethcore-blockchain
* Remove to-pod-full feature
* Sort out the merge
* sort imports
* address grumbles
* rename crate
* address more grumbles
* WIP move errors, pod_account and state account to own crates
* Sort out dependencies, fix broken code and tests
Remove botched ethcore-error crate
* remove template line
* fix review feedback
* Remove test-only AccountDBMut::new
* Extract AccountDB to account-db
* test failure
* test failure 2
* third time's the charm
* Better logging when backfilling ancient blocks fail
Print total blocks imported, closes#10792
* `finalize()` doesn't need Engine
Pull out call to migrated_blocks() from replace_client_db()
* More logs
* Clarify that the percentage may be misleading
* Remove replace_client_db() and replace with a straight call to restore_db()
* Include the parent_hash in UnlinkedAncientBlockChain errors
* Add a new RestorationStatus varian: Finalizing (as it can take a loooong while)
Call abort_restore() when restoration fails
* Add missing cases for new variant
* typos
* Typo and derive Debug
* Do not attempt to salvage existing blocks unless they form a complete chain back to genesis
* Fix test
* Revert "Fix test"
This reverts commit f027d4b4cb7b6c23fceec528c1711886ba9cfe4e.
* Fix test again
* Update comment
* Be careful about locks
* fix test failure
* Do not defer returning an error when the chain is broken
* Review feedback
* no hex formatting for Option
* Add a way to signal shutdown to snapshotting threads
* Pass Progress to fat_rlps() so we can abort from there too.
* Checking for abort in a single spot
* Remove nightly-only weak/strong counts
* fix warning
* Fix tests
* Add dummy impl to abort snapshots
* Add another dummy impl for TestSnapshotService
* Remove debugging code
* Return error instead of the odd Ok(())
Switch to AtomicU64
* Use fewer threads for snapshotting
When taking a snapshot the current default number of threads is equal to half the number of **logical** CPUs in the system. On HT enabled CPUs this value seems a bit high, e.g. 6 snapshotting threads on a 6/12 core/hyperthread CPU. Maybe a better default value is half the number of physical cores?
* fix test
* Extract accounts from ethcore.
* Fix ethcore.
* Get rid of AccountProvider in test_helpers
* Fix rest of the code.
* Re-use EngineSigner, fix tests.
* Simplify EngineSigner to always have an Address.
* Fix RPC tests.
* Add deprecation notice to RPCs.
* Feature to disable accounts.
* extract accounts in RPC
* Run with accounts in tests.
* Fix RPC compilation and tests.
* Fix compilation of the binary.
* Fix compilation of the binary.
* Fix compilation with accounts enabled.
* Fix tests.
* Update submodule.
* Remove android.
* Use derive for Default
* Don't build secretstore by default.
* Add link to issue.
* Refresh Cargo.lock.
* Fix miner tests.
* Update rpc/Cargo.toml
Co-Authored-By: tomusdrw <tomusdrw@users.noreply.github.com>
* Fix private tests.
* Replace ethcore-logger with env-logger.
* Fix logger initialization in WASM tests.
* uncomment logger initialization in secret store
* Don't use ethcore-logger in whisper.
* Move ethcore-logger within parity dir.
* Uncomment rest from secret-store.
* Use `let _ =` in private_contract for consistency
* `ok()` to `let _ =` fix in service
* Use `let _ = ` for state_db
Fix: new blocks notifications sometimes missing in pubsub RPC
Implement new struct to pass to `new_blocks()` with extra parameter - `has_more_blocks_to_import`, which was previously used to determine whether the notification should be sent. Now it's up to each implementation to decide what to do.
Updated all implementations to behave as before, except `eth_pubsub`, which will send notification even when the queue is not empty.
Update tests.
* Rename db_restore => client
* First step: make it compile!
* Second step: working implementation!
* Refactoring
* Fix tests
* PR Grumbles
* PR Grumbles WIP
* Migrate ancient blocks interating backward
* Early return in block migration if snapshot is aborted
* Remove RwLock getter (PR Grumble I)
* Remove dependency on `Client`: only used Traits
* Add test for recovering aborted snapshot recovery
* Add test for migrating old blocks
* Fix build
* PR Grumble I
* PR Grumble II
* PR Grumble III
* PR Grumble IV
* PR Grumble V
* PR Grumble VI
* Fix one test
* Fix test
* PR Grumble
* PR Grumbles
* PR Grumbles II
* Fix tests
* Release RwLock earlier
* Revert Cargo.lock
* Update _update ancient block_ logic: set local in `commit`
* Update typo in ethcore/src/snapshot/service.rs
Co-Authored-By: ngotchac <ngotchac@gmail.com>
* Fixing and disabling some tests for windows 10 compatibility.
* Few adjustment for windows in tests (eg bigger timeout for keyserver tests)
* Spaces and temporary single thread ci (to be able to spot the error).
* new ethabi migration in progress
* parity migrated to new ethabi
* migrated secred-store to new ethabi
* bump ethabi to 6.0
* fixed review suggestions
* blockchain insert expects owned block instead of block reference
* reduce a number of times a block is deserialized
* removed cached uncle_bytes from block
* removed is_finalized from OpenBlock
* removed unused parity_machine::WithMetadata trait
* removed commented out code
* remove unused metadata from block
* remove unused metadata from block
* BlockDetails extras may have at most 5 elements
The `patricia_trie` crate is generic over the hasher (by way of HashDB) and node encoding scheme. Adds a new `patricia_trie_ethereum` crate with concrete impls for Keccak/RLP.
* new blooms database
* fixed conflict in Cargo.lock
* removed bloomchain
* cleanup in progress
* all tests passing in trace db with new blooms-db
* added trace_blooms to BlockChainDB interface, fixed db flushing
* BlockChainDB no longer exposes RwLock in the interface
* automatically flush blooms-db after every insert
* blooms-db uses io::BufReader to read files, wrap blooms-db into Mutex, cause fs::File is just a shared file handle
* fix json_tests
* blooms-db can filter multiple possibilities at the same time
* removed enum trace/db.rs CacheId
* lint fixes
* fixed tests
* kvdb-rocksdb uses fs-swap crate
* update Cargo.lock
* use fs::rename
* fixed failing test on linux
* fix tests
* use fs_swap
* fixed failing test on linux
* cleanup after swap
* fix tests
* fixed osx permissions
* simplify parity database opening functions
* added migration to blooms-db
* address @niklasad1 grumbles
* fix license and authors field of blooms-db Cargo.toml
* restore blooms-db after snapshot
* Remove unused Result wrap in has_account
* Check whether we need to reseal for external transactions
* Fix reference to has_account interface
* typo: missing )
* Refactor duplicates to prepare_and_update_sealing
* Fix build
* Update `add_license` script
* run script
* add `remove duplicate lines script` and run it
* Revert changes `English spaces`
* strip whitespaces
* Revert `GPL` in files with `apache/mit license`
* don't append `gpl license` in files with other lic
* Don't append `gpl header` in files with other lic.
* re-ran script
* include c and cpp files too
* remove duplicate header
* rebase nit
* Add light client TODO item
* Move existing total-difficulty-based fork choice check to Engine
* Abstract total difficulty and block provider as Machine::BlockMetadata and Machine::BlockProvider
* Decouple "generate_metadata" logic to Engine
* Use fixed BlockMetadata and BlockProvider type for null and instantseal
In this way they can use total difficulty fork choice check
* Extend blockdetails with metadatas and finalized info
* Extra data update: mark_finalized and update_metadatas
* Check finalized block in Blockchain
* Fix a test constructor in verification mod
* Add total difficulty trait
* Fix type import
* Db migration to V13 with metadata column
* Address grumbles
* metadatas -> metadata
* Use generic type for update_metadata to avoid passing HashMap all around
* Remove metadata in blockdetails
* [WIP] Implement a generic metadata architecture
* [WIP] Metadata insertion logic in BlockChain
* typo: Value -> Self::Value
* [WIP] Temporarily remove Engine::is_new_best interface
So that we don't have too many type errors.
* [WIP] Fix more type errors
* [WIP] ExtendedHeader::PartialEq
* [WIP] Change metadata type Option<Vec<u8>> to Vec<u8>
* [WIP] Remove Metadata Error
* [WIP] Clean up error conversion
* [WIP] finalized -> is_finalized
* [WIP] Mark all fields in ExtrasInsert as pub
* [WIP] Remove unused import
* [WIP] Keep only local metadata info
* Mark metadata as optional
* [WIP] Revert metadata db change in BlockChain
* [WIP] Put finalization in unclosed state
* Use metadata interface in BlockDetail
* [WIP] Fix current build failures
* [WIP] Remove unused blockmetadata struct
* Remove DB migration info
* [WIP] Typo
* Use ExtendedHeader to implement fork choice check
* Implement is_new_best using Ancestry iterator
* Use expect instead of panic
* [WIP] Add ancestry Engine support via on_new_block
* Fix tests
* Emission of ancestry actions
* use_short_version should take account of metadata
* Engine::is_new_best -> Engine::fork_choice
* Use proper expect format as defined in #1026
* panic -> expect
* ancestry_header -> ancestry_with_metadata
* Boxed iterator -> &mut iterator
* Fix tests
* is_new_best -> primitive_fork_choice
* Document how fork_choice works
* Engine::fork_choice -> Engine::primitive_fork_choice
* comment: clarify types of finalization where Engine::primitive_fork_choice works
* Expose FinalizationInfo to Engine
* Fix tests due to merging
* Remove TotalDifficulty trait
* Do not pass FinalizationInfo to Engine
If there's finalized blocks in from route, choose the old branch without calling `Engine::fork_choice`.
* Fix compile
* Fix unused import
* Remove is_to_route_finalized
When no block reorg passes a finalized block, this variable is always false.
* Address format grumbles
* Fix docs: mark_finalized returns None if block hash is not found
`blockchain` mod does not yet have an Error type, so we still temporarily use None here.
* Fix inaccurate tree_route None expect description
* 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.
* change mode: remove rust files' executable mode.
* 2 tiny modifications on snapshot.
* rlp::decode returns Result
* Fix journaldb to handle rlp::decode Result
* Fix ethcore to work with rlp::decode returning Result
* Light client handles rlp::decode returning Result
* Fix tests in rlp_derive
* Fix tests
* Cleanup
* cleanup
* Allow panic rather than breaking out of iterator
* Let decoding failures when reading from disk blow up
* syntax
* Fix the trivial grumbles
* Fix failing tests
* Make Account::from_rlp return Result
* Syntx, sigh
* Temp-fix for decoding failures
* Header::decode returns Result
Handle new return type throughout the code base.
* Do not continue reading from the DB when a value could not be read
* Fix tests
* Handle header decoding in light_sync
* Handling header decoding errors
* Let the DecodeError bubble up unchanged
* Remove redundant error conversion
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).
