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

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Python
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import re
import subprocess
from selfprivacy_api.jobs import JobStatus, Jobs
COMPLETED_WITH_ERROR = "Completed with an error"
RESULT_WAAS_NOT_FOUND_ERROR = "We are sorry, result was not found :("
CLEAR_COMPLETED = "Сleaning completed."
def run_nix_store_print_dead():
return subprocess.check_output(["nix-store", "--gc", "--print-dead"]).decode(
"utf-8"
)
def run_nix_collect_garbage():
return subprocess.Popen(
["nix-collect-garbage", "-d"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT
).stdout
def set_job_status_wrapper(Jobs, job):
def set_job_status(status, progress, status_text, result="Default result"):
Jobs.update(
job=job,
status=status,
progress=progress,
status_text=status_text,
result=result,
)
return set_job_status
def parse_line(line):
pattern = re.compile(r"[+-]?\d+\.\d+ \w+(?= freed)")
match = re.search(
pattern,
line,
)
if match is None:
return (
JobStatus.FINISHED,
100,
COMPLETED_WITH_ERROR,
RESULT_WAAS_NOT_FOUND_ERROR,
)
else:
return (
JobStatus.FINISHED,
100,
CLEAR_COMPLETED,
f"{match.group(0)} have been cleared",
)
def stream_process(
stream,
package_equal_to_percent,
set_job_status,
):
percent = 0
for line in stream:
if "deleting '/nix/store/" in line:
percent += package_equal_to_percent
set_job_status(
status=JobStatus.RUNNING,
progress=int(percent),
status_text="Сleaning...",
)
elif "store paths deleted," in line:
status = parse_line(line)
set_job_status(
status=status[0],
progress=status[1],
status_text=status[2],
result=status[3],
)
def get_dead_packages(output):
dead = len(re.findall("/nix/store/", output))
percent = None
if dead != 0:
percent = 100 / dead
return dead, percent
def nix_collect_garbage(
job,
jobs=Jobs,
run_nix_store=run_nix_store_print_dead,
run_nix_collect=run_nix_collect_garbage,
set_job_status=None,
): # innocent as a pure function
set_job_status = set_job_status or set_job_status_wrapper(jobs, job)
set_job_status(
status=JobStatus.RUNNING,
progress=0,
status_text="Сalculate the number of dead packages...",
)
dead_packages, package_equal_to_percent = get_dead_packages(run_nix_store())
if dead_packages == 0:
set_job_status(
status=JobStatus.FINISHED,
progress=100,
status_text="Nothing to clear",
result="System is clear",
)
return
set_job_status(
status=JobStatus.RUNNING,
progress=0,
status_text=f"Found {dead_packages} packages to remove!",
)
stream_process(run_nix_collect(), package_equal_to_percent, set_job_status)