2020-10-19 10:47:26 -03:00
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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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2020-12-07 07:39:27 -05:00
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from lbry.db.tables import Trend, Support, Claim
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2020-10-19 10:47:26 -03:00
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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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with p.ctx.engine.begin() as ctx:
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2020-12-07 07:39:27 -05:00
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ctx.execute(Trend.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 = (
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select([Claim.c.claim_hash, trending, trending, trending, 4])
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.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)
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).group_by(Claim.c.claim_hash)
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)
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ctx.execute(Trend.insert().from_select(
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['claim_hash', 'trend_global', 'trend_local', 'trend_mixed', 'trend_group'], sql
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))
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