selfprivacy-rest-api/selfprivacy_api/jobs/nix_collect_garbage.py

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import re
import subprocess
from selfprivacy_api.jobs import Job, JobStatus, Jobs
from selfprivacy_api.utils.huey import huey
@huey.task()
def nix_collect_garbage(job: Job):
Jobs.update(
job=job,
status=JobStatus.RUNNING,
progress=0,
status_text="Сalculate the number of dead packages...",
)
output = subprocess.check_output(
["nix-store --gc --print-dead", "--gc", "--print-dead"]
)
dead_packages = len(re.findall("/nix/store/", output.decode("utf-8")))
package_equal_to_percent = 100 / dead_packages
Jobs.update(
job=job,
status=JobStatus.RUNNING,
progress=0,
status_text=f"Found {dead_packages} packages to remove!",
)
def _parse_line(line):
pattern = re.compile(r"[+-]?\d+\.\d+ \w+ freed")
match = re.search(
pattern,
line,
)
if match is None:
Jobs.update(
job=job,
status=JobStatus.FINISHED,
progress=100,
status_text="Completed with an error",
result="We are sorry, result was not found :(",
)
else:
Jobs.update(
job=job,
status=JobStatus.FINISHED,
progress=100,
status_text="Сleaning completed.",
result=f"{match.group(0)} have been cleared",
)
def _stream_process(process):
go = process.poll() is None
percent = 0
for line in process.stdout:
if "deleting '/nix/store/" in line:
percent += package_equal_to_percent
Jobs.update(
job=job,
status=JobStatus.RUNNING,
progress=int(percent),
status_text="Сleaning...",
)
elif "store paths deleted," in line:
_parse_line(line)
return go
process = subprocess.Popen(
["nix-collect-garbage", "-d"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT
)
_stream_process(process)