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interface (#110)
Since third party apps will possibly implement their only blockdb class,
it make sense for the interface to be in core.
Also add GetNumShards into the governance interface.
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`Height` from `Block` (#89)
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- Avoid using recursive function in critical path.
- Do not write through when using levelDB. Things put to
levelDB would be safe from panic even we didn't force
to write through every time.
- Dump count of confirmed blocks proposed by self.
- Avoid allocating variables in loop.
- Return length of acking node set, we only need that
when total ordering.
- Fix potential bug: make sure win records updated when
acking height vectors of candidates are changed.
- Keep dirty validators in slice.
- Add cache for objects to ease the pressure to garbage
collector.
- Cache global acking status when total ordering.
- Add method to recycle blocks.
- Marshal JSON should be called once for each broadcast.
- Make updateWinRecord called in parallel.
- Log average / deviation of latencies when simulation
finished.
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* Add blocks generator.
This helper would randomly generate blocks that forms valid DAGs.
* Add revealer
Revealer is an extension of blockdb.BlockIterator. The block
sequence from 'Next' method would be either randomly (see
RandomRevealer) or meeting some specific condition (ex. forming
a DAG, see RandomDAGRevealer).
* Add test for sequencer based on random blocks.
* core: refine Application interface and add Governance interface (#24)
Add a new Governance interface for interaction with the governance contract.
Also remove the ValidateBlock call in application interface as the application should validate it before putting it into the consensus module.
A new BlockConverter interface is also added. The consensus module should accept the BlockConverter interface in future implementation, and use the Block() function to get the underlying block info.
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- Allow to dump blockdb to a json file
- Compared to leveldb, a json file is easier to trace.
- Add interfaces block database:
- Close would be required by database that needs cleanup.
- BlockIterator is required when we need to access 'all' blocks,
adding a new method 'GetAll' as the constructor for iterators.
- Remove GetByValidatorAndHeight from blockdb.Reader
- This function is not used anywhere, to make interface
minimum, remove it.
- Fix typo: backend -> backed
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* Refactor and add acking module
Extract acking module for unit testing. This commit splits functions
into small pieces for better understanding and easy unit testing.
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* Add test to cover blockdb.syncIndex
* Test GetByValidatorAndHeight after syncIndex
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* Fix typos and add .gitignore
* Add more rule on .gitignore
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