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* dex: backport f6193ad
* dex/downloader: backport accc0fa accc0fab 174083c3
* dex: backport 434dd5b
* dex: backport 42a914a 0983d02
* dex: backport 48b70ec 31b3334 and some modification
* dex/downloader: backport 5f251a6
* dex/downloader: backport 81c3dc7
* dex, dex/downloader: fix typos
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(#168)
Refactor GenerateDexonChain function, move governance tx logic to
the user of GenerateDexonChain (testchain_test.go) and move fake node set
code to FakeDexcon.
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Since blocks will interleave around round change, we will probably need
to verify blocks at previous round.
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In dexon, we don't "mine" and the blockchain won't and shouldn't fork, so
there is no difficulty concept, just replace it with block number.
Note: this commit only replace total difficulty related logic and code
in dex, dex/downloader package.
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Also rename InsertChain2, insertChain2, InsertHeaderChain2,
ValidateHeaderChain2
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We need governance state to verify block's signature (randomness),
but in ethereum fast sync mode, eth downloader only downloads the whole
state of pivot block, so we don't have governance state to verify the
downloaded block that is before pivot block if we don't processing
transaction.
To avoid running transactions, dex downloader also downloads the
governance state (merkle proof and storage) at snapshot height of each round,
so that we can verify blocks in fast sync mode.
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