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83 lines
2.3 KiB
83 lines
2.3 KiB
Architecture
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============
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.. image:: https://docs.google.com/drawings/d/1Su_DR2c8__-4phm12hAzV65fL2tNm_1IhKr4XivkW6Q/pub?w=720&h=540
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:target: https://docs.google.com/drawings/d/1Su_DR2c8__-4phm12hAzV65fL2tNm_1IhKr4XivkW6Q/pub?w=960&h=720
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Env
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---
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Holds configuration taken from the environment, with apprioriate
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defaulting appropriately. Generally passed to the constructor of
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other components which take their settings from it.
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Controller
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----------
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The central part of the server process initialising and coordinating
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all the others. Manages resource usage.
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LocalRPC
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--------
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Handles local JSON RPC connections querying ElectrumX server state.
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Started when the ElectrumX process starts.
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ElectrumX
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---------
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Handles JSON Electrum client connections over TCP or SSL. One
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instance per client session. Should be the only component concerned
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with the details of the Electrum wire protocol.
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Not started until the Block Processor has caught up with bitcoind.
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Daemon
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------
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Encapsulates the RPC wire protocol with bitcoind for the whole server.
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Transparently handles temporary bitcoind connection errors, and fails
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over if necessary.
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Notifies the Mempool when the list of mempool transaction hashes is
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updated.
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Block Processor
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---------------
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Responsible for managing block chain state (UTXO set, history,
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transaction and undo information) and for handling block chain
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reorganisations.
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When caught up, processes new blocks as they are found, and flushes
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the updates to the Database immediately.
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When syncing uses caches for in-memory state updates since the prior
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flush. Occasionally flushes state to the storage layer when caches
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get large.
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Prefetcher
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----------
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Cooperates with the Block Processor to asynchronously prefetch blocks
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from bitcoind. Once it has caught up it additionally asks the Daemon
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to refresh its view of bitcoind's mempool transaction hashes. Serves
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blocks to the Block Processor via a queue.
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Mempool
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-------
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Handles all the details of maintaining a representation of bitcoind's
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mempool state. Obtains the list of current mempool transaction hashes
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from the Daemon when notified by the Prefetcher.
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Notifies the Controller that addresses have been touched when the
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mempool refreshes (or implicitly when a new block is found).
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Database
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--------
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The underlying data store, made up of the DB backend (such as
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`leveldb`) and the host filesystem.
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