This PR adds re-written difficulty calculators, which are based on uint256. It also adds a fuzzer + oss-fuzz integration for the new fuzzer. It does differential fuzzing between the new and old calculators.
Note: this PR does not actually enable the new calculators.
# Conflicts:
# consensus/ethash/consensus_test.go
* First algorithm
* Update doc
* Second algorithm implemented
* Prepend (unfinished)
* More on prepend
* More fixes
* Change CalcDifficulty interface
* fix make test
* Fix formatting
* Another test
* More on Preprend
* Another test for Prepend
* More tests for Prepend
* More tests for Prepend
* Move files to turbo
* Add another test for Prepend
* Started adding Append algorithm
* More work on Append
* Start changing the terminology
* Split trees into segments
* More fixes
* Fix compilation
* Connect
* FindAnchors, FindTip
* Tip has anchor and not anchorParent field
* Remove Prepend and Append
* Add Connect
* NewAnchor algorithm
* More to recovery from files
* Add more to AddAnchor
* Request more headers
* Header fix-sizes serialisation
* Upgrade CI to 1.15
* Fix lint
* Fix lint
* replace RLP with fixed-sized serialisation
* Fix lint
* More algos
* Fix lint
Tests are now included as a submodule. This should make updating easier
and removes ~60MB of JSON data from the working copy.
State tests are replaced by General State Tests, which run the same test
with multiple fork configurations.
With the new test runner, consensus tests are run as subtests by walking
json files. Many hex issues have been fixed upstream since the last
update and most custom parsing code is replaced by existing JSON hex
types. Tests can now be marked as 'expected failures', ensuring that
fixes for those tests will trigger an update to test configuration. The
new test runner also supports parallel execution and the -short flag.
This commit is a preparation for the upcoming metropolis hardfork. It
prepares the state, core and vm packages such that integration with
metropolis becomes less of a hassle.
* Difficulty calculation requires header instead of individual
parameters
* statedb.StartRecord renamed to statedb.Prepare and added Finalise
method required by metropolis, which removes unwanted accounts from
the state (i.e. selfdestruct)
* State keeps record of destructed objects (in addition to dirty
objects)
* core/vm pre-compiles may now return errors
* core/vm pre-compiles gas check now take the full byte slice as argument
instead of just the size
* core/vm now keeps several hard-fork instruction tables instead of a
single instruction table and removes the need for hard-fork checks in
the instructions
* core/vm contains a empty restruction function which is added in
preparation of metropolis write-only mode operations
* Adds the bn256 curve
* Adds and sets the metropolis chain config block parameters (2^64-1)
This commit adds pluggable consensus engines to go-ethereum. In short, it
introduces a generic consensus interface, and refactors the entire codebase to
use this interface.
