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`Height` from `Block` (#89)
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- Replace map with slice
Compared to slice, accessing to map is slower and
the memory usage is inefficient.
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- the checking of `internal stability` is more expensive than checking `len(ANS) == validatorCount`. So only check it when `len(ANS) != validatorCount`.
- cache the result of `grade` between candidates.
- cache the `acking height vector` of each candidate.
- add test on total ordering with different acking frequency between blocks.
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* Add hash to block
* Check block hash in Consensus.sanityCheck
* Add hashBlockFn in block generator.go
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(#37)
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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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