* Cosmetics, small fixes, add stashed headers verifier
* Remove direct `Era1` support
why:
Era1 is indirectly supported by using the import tool before syncing.
* Clarify database persistent save function.
why:
Function relied on the last saved state block number which was wrong.
It now relies on the tx-level. If it is 0, then data are saved directly.
Otherwise the task that owns the tx will do it.
* Extracted configuration constants into separate file
* Enable single peer mode for debugging
* Fix peer losing issue in multi-mode
details:
Running concurrent download peers was previously programmed as running
a batch downloading and storing ~8k headers and then leaving the `async`
function to be restarted by a scheduler.
This was unfortunate because of occasionally occurring long waiting
times for restart.
While the time gap until restarting were typically observed a few
millisecs, there were always a few outliers which well exceed several
seconds. This seemed to let remote peers run into timeouts.
* Prefix function names `unprocXxx()` and `stagedYyy()` by `headers`
why:
There will be other `unproc` and `staged` modules.
* Remove cruft, update logging
* Fix accounting issue
details:
When staging after fetching headers from the network, there was an off
by 1 error occurring when the result was by one smaller than requested.
Also, a whole range was mis-accounted when a peer was terminating
connection immediately after responding.
* Fix slow/error header accounting when fetching
why:
Originally set for detecting slow headers in a row, the counter
was wrongly extended to general errors.
* Ban peers for a while that respond with too few headers continuously
why:
Some peers only returned one header at a time. If these peers sit on a
farm, they might collectively slow down the download process.
* Update RPC beacon header updater
why:
Old function hook has slightly changed its meaning since it was used
for snap sync. Also, the old hook is used by other functions already.
* Limit number of peers or set to single peer mode
details:
Merge several concepts, single peer mode being one of it.
* Some code clean up, fixings for removing of compiler warnings
* De-noise header fetch related sources
why:
Header download looks relatively stable, so general debugging is not
needed, anymore. This is the equivalent of removing the scaffold from
the part of the building where work has completed.
* More clean up and code prettification for headers stuff
* Implement body fetch and block import
details:
Available headers are used stage blocks by combining existing headers
with newly fetched blocks. Then these blocks are imported/executed via
`persistBlocks()`.
* Logger cosmetics and cleanup
* Remove staged block queue debugging
details:
Feature still available, just not executed anymore
* Docu, logging update
* Update/simplify `runDaemon()`
* Re-calibrate block body requests and soft config for import blocks batch
why:
* For fetching, larger fetch requests are mostly truncated anyway on
MainNet.
* For executing, smaller batch sizes reduce the memory needed for the
price of longer execution times.
* Update metrics counters
* Docu update
* Some fixes, formatting updates, etc.
* Update `borrowed` type: uint -. uint64
also:
Always convert to `uint64` rather than `uint` where appropriate
* Block header download starting at Beacon down to Era1
details:
The header download implementation is intended to be completed to a
full sync facility.
Downloaded block headers are stored in a `CoreDb` table. Later on they
should be fetched, complemented by a block body, executed/imported,
and deleted from the table.
The Era1 repository may be partial or missing. Era1 headers are neither
downloaded nor stored on the `CoreDb` table.
Headers are downloaded top down (largest block number first) using the
hash of the block header by one peer. Other peers fetch headers
opportunistically using block numbers
Observed download times for 14m `MainNet` headers varies between 30min
and 1h (Era1 size truncated to 66m blocks.), full download 52min
(anectdotal.) The number of peers downloading concurrently is crucial
here.
* Activate `flare` by command line option
* Fix copyright year
Jordan Hrycaj