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from __future__ import division
from db import dbconn
import datetime
from sys import argv
def affected_indices(company_id):
"""returns the list of indices containing company_id"""
with serenitasdb.cursor() as c:
sqlstr = """SELECT * FROM
(SELECT unnest(index_list) AS basketid FROM bbg_issuers WHERE company_id=%s) a
JOIN index_version USING (basketid)
WHERE lastdate='infinity'"""
c.execute(sqlstr, (company_id,))
recordslist = c.fetchall()
return recordslist
def create_newindices(recordslist, lastdate, nissuers):
"""create the new indices versions and update the old"""
insertstr = """INSERT INTO index_version(Index, Series, Version, IndexFactor,
CumulativeLoss, lastdate) Values(%(index)s, %(series)s, %(version)s, %(indexfactor)s,
%(cumulativeloss)s, %(lastdate)s) RETURNING basketid"""
updatestr = "UPDATE index_version SET lastdate=%s WHERE basketid=%s"
with serenitasdb.cursor() as c:
newids = {}
for r in recordslist:
r['indexfactor'] -= 100/nissuers
r['version'] += 1
r['cumulativeloss'] += (100-recovery)/nissuers
r['lastdate'] = 'infinity'
c.execute(insertstr, r)
newids[r['basketid']] = c.fetchone()[0]
for oldid in newids.keys():
c.execute(updatestr, (lastdate, oldid))
serenitasdb.commit()
return newids
def update_indexmembers(newids, company_id):
with serenitasdb.cursor() as c:
for oldid, newid in newids.items():
c.execute("""update bbg_issuers set index_list=index_list||%s where company_id in
(select company_id from bbg_issuers where %s=Any(index_list)
and company_id != %s)""", (newid, oldid, company_id))
serenitasdb.commit()
if __name__=="__main__":
if len(argv) == 1:
print("""Usage:
python handle_default.py <company_id> <date> <recovery> <n_issuers>
For instance:
python handle_default.py 210065 2015-02-19 15.875 100""")
else:
with dbconn('serenitasdb') as serenitasdb:
company_id = int(argv[1])
lastdate = datetime.datetime.strptime(argv[2], "%Y-%m-%d")
recovery = float(argv[3])
n_issuers = float(argv[4])
recordslist = affected_indices(company_id)
newids = create_newindices(recordslist, lastdate, n_issuers)
update_indexmembers(newids, company_id)
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