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

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import re
import subprocess
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from selfprivacy_api.jobs import JobStatus, Jobs, Job
# from selfprivacy_api.utils.huey import huey
COMPLETED_WITH_ERROR = "Completed with an error"
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RESULT_WAS_NOT_FOUND_ERROR = "We are sorry, result was not found :("
CLEAR_COMPLETED = "Сleaning completed."
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def run_nix_store_print_dead():
return subprocess.check_output(["nix-store", "--gc", "--print-dead"]).decode(
"utf-8"
)
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def run_nix_collect_garbage():
return subprocess.Popen(
["nix-collect-garbage", "-d"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT
).stdout
def parse_line(line):
pattern = re.compile(r"[+-]?\d+\.\d+ \w+(?= freed)")
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match = re.search(pattern, line)
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if match is None:
return (
JobStatus.FINISHED,
100,
COMPLETED_WITH_ERROR,
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RESULT_WAS_NOT_FOUND_ERROR,
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)
else:
return (
JobStatus.FINISHED,
100,
CLEAR_COMPLETED,
f"{match.group(0)} have been cleared",
)
def stream_process(
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job,
stream,
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total_dead_packages,
):
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completed_packages = 0
for line in stream:
if "deleting '/nix/store/" in line:
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completed_packages += 1
percent = int((completed_packages / total_dead_packages) * 100)
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Jobs.update(
job=job,
status=JobStatus.RUNNING,
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progress=percent,
status_text="Сleaning...",
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)
elif "store paths deleted," in line:
status = parse_line(line)
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Jobs.update(
job=job,
status=status[0],
progress=status[1],
status_text=status[2],
result=status[3],
)
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def get_dead_packages(output):
dead = len(re.findall("/nix/store/", output))
percent = None
if dead != 0:
percent = 100 / dead
return dead, percent
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def calculate_and_clear_dead_packages(job: Jobs):
Jobs.update(
job=job,
status=JobStatus.RUNNING,
progress=0,
status_text="Сalculate the number of dead packages...",
)
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dead_packages, package_equal_to_percent = get_dead_packages(
run_nix_store_print_dead()
)
if dead_packages == 0:
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Jobs.update(
job=job,
status=JobStatus.FINISHED,
progress=100,
status_text="Nothing to clear",
result="System is clear",
)
return
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Jobs.update(
job=job,
status=JobStatus.RUNNING,
progress=0,
status_text=f"Found {dead_packages} packages to remove!",
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)
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stream_process(job, run_nix_collect_garbage(), package_equal_to_percent)
def start_nix_collect_garbage() -> Job:
job = Jobs.add(
type_id="maintenance.collect_nix_garbage",
name="Collect garbage",
description=".",
)
calculate_and_clear_dead_packages(job=job)
return job