corsarotrace not following specified number of output files when using multiple threads

[b10n]

When generating flowtuples from pcaps, corsarotrace does not follow the interval and rotatefreq options.

Commit: 9e899da

Steps to reproduce (using Podman, Docker should be similar):

1. Generate a pcap with one packet/hour.

from scapy.all import *
from datetime import datetime, timedelta

start_date = datetime.now()

packets = []

for i in range(24):
    packet_time = start_date + timedelta(hours=i)
    packet = Ether() / IP(src="192.168.1.1", dst="192.168.1.2") / UDP(sport=12345, dport=80) / Raw(load=f"Packet from day {i+1}")
    packet.time = packet_time.timestamp()
    packets.append(packet)

wrpcap("one_day.pcap", packets)

2. Run corsarotrace multi-threaded.

mkdir output
podman run -v './output:/flowtuple/output:rw' -v './one_day.pcap:/flowtuple/example.pcap:ro' offlineft pcapfile:/flowtuple/example.pcap trial run
ls output/*.avro | wc -l

Result: 1
Expected: 24 files since baseconfig.yaml contains interval: 60 and rotatefreq: 60 (one file per hour).

3. Force corsarotrace to run single-threaded.

echo "threads: 1" >> baseconfig.yaml
podman build -t offlineft .
podman run -v './output:/flowtuple/output:rw' -v './one_day.pcap:/flowtuple/example.pcap:ro' offlineft pcapfile:/flowtuple/example.pcap trial run
rm output/*
ls output/*.avro | wc -l

Result: 24 (expected)