You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
99 lines
2.8 KiB
99 lines
2.8 KiB
Components
|
|
==========
|
|
|
|
The components of the server are roughly like this::
|
|
|
|
-------
|
|
- Env -
|
|
-------
|
|
|
|
-------
|
|
- IRC -
|
|
-------
|
|
<
|
|
------------- ------------
|
|
- ElectrumX -<<<<<- LocalRPC -
|
|
------------- ------------
|
|
< >
|
|
---------- ------------------- ----------
|
|
- Daemon -<<<<<<<<- Block processor ->>>>- Caches -
|
|
---------- ------------------- ----------
|
|
< < > <
|
|
-------------- -----------
|
|
- Prefetcher - - Storage -
|
|
-------------- -----------
|
|
|
|
|
|
Env
|
|
---
|
|
|
|
Holds configuration taken from the environment. Handles defaults
|
|
appropriately. Generally passed to the constructor of other
|
|
components which take their settings from it.
|
|
|
|
|
|
LocalRPC
|
|
--------
|
|
|
|
Handles local JSON RPC connections querying ElectrumX server state.
|
|
Not started until the block processor has caught up with the daemon.
|
|
|
|
ElectrumX
|
|
---------
|
|
|
|
Handles JSON Electrum client connections over TCP or SSL. One
|
|
instance per client session. Should be the only component concerned
|
|
with the details of the Electrum wire protocol. Responsible for
|
|
caching of client responses. Not started until the block processor
|
|
has caught up with the daemon. Logically, if not yet in practice, a
|
|
coin-specific class.
|
|
|
|
Daemon
|
|
------
|
|
|
|
Used by the block processor, ElectrumX servers and prefetcher.
|
|
Encapsulates daemon RPC wire protcol. Logically, if not yet in
|
|
practice, a coin-specific class.
|
|
|
|
Block Processor
|
|
---------------
|
|
|
|
Responsible for managing block chain state (UTXO set, history,
|
|
transaction and undo information) and processing towards the chain
|
|
tip. Uses the caches for in-memory state caching. Flushes state to
|
|
the storage layer. Reponsible for handling block chain
|
|
reorganisations. Once caught up maintains a representation of daemon
|
|
mempool state.
|
|
|
|
Caches
|
|
------
|
|
|
|
The file system cache and the UTXO cache are implementation details of
|
|
the block processor, nothing else should interface with them.
|
|
|
|
Storage
|
|
-------
|
|
|
|
Backend database abstraction. Along with the host filesystem, used by
|
|
the block processor (and therefore its caches) to store chain state.
|
|
|
|
Prefetcher
|
|
----------
|
|
|
|
Used by the block processor to asynchronously prefetch blocks from the
|
|
daemon. Holds fetched block height. Once it has caught up
|
|
additionally obtains daemon mempool tx hashes. Serves blocks and
|
|
mempool hashes to the block processor via a queue.
|
|
|
|
IRC
|
|
---
|
|
|
|
Not currently imlpemented; will handle IRC communication for the
|
|
ElectrumX servers.
|
|
|
|
Controller
|
|
----------
|
|
|
|
A historical artefact that currently coordinates some of the above
|
|
components. Not pictured as it is doesn't seem to have a logical
|
|
place and so is probably going away.
|
|
|