Add ElectrumProxy app #293
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Created project and solution for ElectrumProxy.
Start implementing ElectrumProxy server. Implement "server.version" and "server.ping" methods.
Add ElectrumProxy to excludes for printf check, as it uses .NET 6.
Implement blockchain.block.header method both in Backend and in ElectrumProxy.
Refactoring of JSON RPC server - made it into a class.
Implement blockchain.headers.subscribe method and subscription. Implement "blockchain.block.headers", "blockchain.scripthash.get_history", and "blockchain.transaction.get" methods.
In ElectrumProxy only save server stats when exiting the application to decrease load on CPU.
Instead of chceking for duplicates in server stats when saving, keep the collection duplicate-free at all times by checking for existing record when updating or insterting new server stat. This way we can avoid running de-duplication procedure each time the stats are updated.
Implement blockchain.transaction.broadcast method in ElectrumProxy.
Implement BitCoreNode client and use Bitcore node server in addition to Electrum for serving "blockchain.scripthash.get_history" requests. Had to restrict request rate to Bitcore to be 1 at a time with 0.1 secs interval. Otherwise the server would complain about too many requests and fail.
Cache results of "blockchain.scripthash.get_history" requests. This will drastically reduce average rescan time since Liana tries to rescan every 30 seconds or so but new block is added every ~10 min.
Made timeouts an argument that is passed to server's retrieval function. When a full round of failures has happened, timeouts are doubled. Reduced default timeouts because now we don't need such large margins and smaller timeouts mean unresponsive servers will be discarded quicker.
Add client for Blockbook (API used by Trezor). Extract RestAPIClient abstract base class that with common functionality fo REST API clients like BlockbookClient and BitcoreNodeClient.
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Add ElectrumProxy - application that acts as Electrum server redirecting requests to other servers using fault-tolerant parallel client.
Implemented Electrum API methods: