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Comment the calculation of last_due

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This commit is contained in:
Steve Langasek 2017-07-18 18:36:04 +02:00
parent b073a71911
commit 5136a3efb5
1 changed files with 9 additions and 0 deletions
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britney2/policies/email.py
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@ -190,11 +190,20 @@ class EmailPolicy(BasePolicy, Rest):
emails, last_sent = cached
# migration of older data
last_sent = int(last_sent)
# Find out whether we are due to send another email by calculating
# the most recent age at which we should have sent one. A
# sequence of doubling intervals (0 + 1 = 1, 1 + 2 = 3, 3 + 4 = 7)
# is equivalent to 2^n-1, or 2^n + (max_age - 1) - 1.
# 2^(floor(log2(age))) straightforwardly calculates the most
# recent age at which we wanted to send an email.
last_due = int(math.pow(2, int(math.log(age + 2 - max_age, 2)))
+ max_age - 2)
# Don't let the interval double without bounds.
if last_due - max_age >= MAX_INTERVAL:
last_due = int((age - max_age - MAX_INTERVAL) / MAX_INTERVAL) \
* MAX_INTERVAL + max_age + MAX_INTERVAL
# And don't send emails before we've reached the minimum age
# threshold.
if last_due < max_age:
last_due = max_age