36 lines
1.3 KiB
Python
36 lines
1.3 KiB
Python
from sqlalchemy import select
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from sqlalchemy.sql import func
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from lbry.db.query_context import event_emitter, ProgressContext
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from lbry.db.tables import Trending, Support, Claim
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WINDOW = 576 # a day
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@event_emitter("blockchain.sync.trending.update", "steps")
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def calculate_trending(height, p: ProgressContext):
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# zero all as decay
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with p.ctx.engine.begin() as ctx:
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_trending(height, ctx)
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def _trending(height, ctx):
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ctx.execute(Trending.delete())
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start = height - WINDOW
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trending = func.sum(Support.c.amount * (WINDOW - (height - Support.c.height)))
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sql = select([Claim.c.claim_hash, trending, trending, trending, 4]).where(
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(Support.c.claim_hash == Claim.c.claim_hash)
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& (Support.c.height <= height)
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& (Support.c.height >= start)).group_by(Claim.c.claim_hash)
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ctx.execute(Trending.insert().from_select(
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['claim_hash', 'trending_global', 'trending_local', 'trending_mixed', 'trending_group'], sql))
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if __name__ == "__main__":
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from sqlalchemy import create_engine
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import time
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start = time.time()
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engine = create_engine("postgresql:///lbry")
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for height in range(830000, 840000, 1000):
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start = time.time()
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_trending(height, engine)
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print(f"{height} took {time.time() - start} seconds")
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