* Clear rejected sync target so that it would not be processed again
* Use in-memory table to stash headers after FCU import has started
why:
After block imported has started, there is no way to save/stash block
headers persistently. The FCU handlers always maintain a positive
transaction level and in some instances the current transaction is
flushed and re-opened.
This patch fixes an exception thrown when a block header has gone
missing.
* When resuming sync, delete stale headers and state
why:
Deleting headers saves some persistent space that would get lost
otherwise. Deleting the state after resuming prevents from race
conditions.
* On clean start hibernate sync `deamon` entity before first update from CL
details:
Only reduces services are running
* accept FCU from CL
* fetch finalised header after accepting FCY (provides hash only)
* Improve text/meaning of some log messages
* Revisit error handling for useless peers
why:
A peer is abandoned from if the error score is too high. This was not
properly handled for some fringe case when the error was detected at
staging time but fetching via eth/xx was ok.
* Clarify `break` meaning by using labelled `break` statements
* Fix action how to commit when sync target has been reached
why:
The sync target block number might precede than latest FCU block number.
This happens when the engine API squeezes in some request to execute
and import subsequent blocks.
This patch fixes and assert thrown when after reaching target the latest
FCU block number is higher than the expected target block number.
* Update TODO list
* Rename `base` -> `coupler`, `B` -> `C`
why:
Glossary: The jargon `base` is used for the `base state` block number
which can be smaller than what is now the `coupler`.
* Rename `global state` -> `base`, `T` -> `B`
why:
See glossary
* Rename `final` -> `end`, `F` -> `E`
why:
See glossary. Previously, `final` denoted some finalised block but not
`the finalised` block from the glossary (which is maximal.)
* Properly name finalised block as such, rename `Z` -> `F`
why:
See glossary
* Rename `least` -> `dangling`, `L` -> `D`
* Metrics update (variables not covered yet)
* Docu update and corrections
* Logger updates
* Remove obsolete `skeleton*Key` kvt columns from `storage_types` module
* Remove `--sync-mode` option from nimbus config
why:
Currently there is only one sync mode available.
* Rename `flare` -> `beacon`, but not base module folder and nim source
why:
The name `flare` was used do designate an alternative `beacon` mode that.
Leaving the base folder and source as-is for a moment, makes it easier
to read change diffs.
* Rename `flare` base module folder and nim source: `flare` -> `beacon`