instantsend: Optimizations and refactoring#3970

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UdjinM6 wants to merge 15 commits intodashpay:developfrom

UdjinM6:is_optim

Commits on Feb 4, 2021

refactor: Add `const` qualifier to various InstantSend related methods
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instantsend: bump IS cache size
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instantsend: keep islocks cache when removing confirmed islocks from db
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refactor: Drop ProcessNewTransaction
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instantsend: Introduce (and use) KnownInstantSendLock
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instantsend: Optimize ProcessInstantSendLock, check for known islocks first
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instantsend: Batched write/erase for connected/disconnected blocks
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instantsend: Mark a block with IS-locks which conflict with txes in a CL-ed block as conflicting and not as invalid
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instantsend: Bail out early on disabled IS in more places
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instantsend: Disable InstantSend while reindexing and importing blocks
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refactor: Simplify GetInstantSendLock(*) methods
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refactor: Check height inside Remove(Archived/Confirmed)InstantSendLocks
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refactor: Squash two loops in AddNonLockedTx into one
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tests: Tweak feature_llmq_is_cl_conflicts.py to test CL overriding a block with conflicting IS-locks
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instantsend|sigs: Sleep when there is no more work
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