Commits on Jan 30, 2020

1. [#9927] Fast blocks sync after being offline …

   Front end changes:
    As there is no guarantee that `newblock` event will be dispatched
   consequently (e.g. if there was a delay after block#1 the next event
   might be dispatched for a block#2000, no guarantee that block#2 will be
   the next one), `newTransactions` field was added with a map of accounts
   to the number of new transactions received to this block. In result if
   there are new transactions we request them all of db instead of fetching
   them on for the block specified in `newblock` event, as it was done
   previously.
   
   Back end changes:
   - In order to avoid handling of the reorganized blocks we use an offset
   from the latest known block when start listening to new blocks. Before
   this commit the offset was 15 blocks for all networks. This offset is
   too big for mainnet and causes noticeable delay of marking a transfer as
   confirmed in Status (comparing to etherscan). So it was changed to be 5
   blocks on mainnet and is still 15 blocks on other networks.
   - Also before this commit all new blocks were handled one by one with
   network specific interval (10s for mainnet), which means that in case of
   lost internet connection or application suspension (happens on iOS)
   receiving of new blocks would be paused and then resumed with the same
   "speed" - 1 blocks per 10s. In case if that pause is big enough the
   application would never catch up with the latest block in the network,
   and this also causes the state of transfers to be delayed in the
   application. In this commit in case if there was more than 40s delay
   after receiving of the previous block the whole history in range between
   the previous received block and ("latest"-reorgeSafetyDepth) block is
   checked at once and app catches up with a recent state of the chain.

   

   rasom committed Jan 30, 2020
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