global DB
DB = connect(dbname)
try:
- DB.execute("""alter table events add column
- is_incoming int not null default TRUE""")
+ DB.execute(
+ """alter table events add column
+ is_incoming int not null default TRUE"""
+ )
except OperationalError:
DB.execute(SCHEMA)
)
DB.commit()
-def fetch(imei, protos, backlog):
+
+def fetch(imei, matchlist, backlog):
+ # matchlist is a list of tuples (is_incoming, proto)
+ # returns a list of tuples (is_incoming, timestamp, packet)
assert DB is not None
- protosel = ", ".join(["?" for _ in range(len(protos))])
+ selector = " or ".join(
+ (f"(is_incoming = ? and proto = ?)" for _ in range(len(matchlist)))
+ )
cur = DB.cursor()
- cur.execute(f"""select packet from events
- where proto in ({protosel}) and imei = ?
+ cur.execute(
+ f"""select is_incoming, tstamp, packet from events
+ where ({selector}) and imei = ?
order by tstamp desc limit ?""",
- protos + (imei, backlog))
- result = [row[0] for row in cur]
+ tuple(item for sublist in matchlist for item in sublist)
+ + (imei, backlog),
+ )
+ result = list(cur)
cur.close()
- return result
+ return list(reversed(result))