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

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import re
import subprocess
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from subprocess import Popen, PIPE
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from selfprivacy_api.utils.huey import huey
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from selfprivacy_api.jobs import JobStatus, Jobs, Job
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COMPLETED_WITH_ERROR = (
"We are sorry, сompleted with an error, report it to support chat"
)
RESULT_WAS_NOT_FOUND_ERROR = "We are sorry, garbage collection result was not found, something went wrong, report it to support chat :("
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CLEAR_COMPLETED = "Cleaning completed."
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def run_nix_store_print_dead() -> PIPE:
subprocess.run(
["nix-env", "-p", "/nix/var/nix/profiles/system", "--delete-generations old"],
check=False,
)
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return subprocess.check_output(["nix-store", "--gc", "--print-dead"]).decode(
"utf-8"
)
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def run_nix_collect_garbage() -> subprocess.Popen:
return subprocess.Popen(
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["nix-store", "--gc"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT
).stdout
def parse_line(line):
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"""
We parse the string for the presence of a final line,
with the final amount of space cleared.
Simply put, we're just looking for a similar string:
"1537 store paths deleted, 339.84 MiB freed".
"""
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",
)
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def process_stream(job, stream, total_dead_packages):
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completed_packages = 0
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prev_progress = 0
for line in stream:
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line = line.decode("utf-8")
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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if percent - prev_progress >= 5:
Jobs.update(
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job=Job,
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status=JobStatus.RUNNING,
progress=percent,
status_text="Cleaning...",
)
prev_progress = percent
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elif "store paths deleted," in line:
status = parse_line(line)
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Jobs.update(
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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))
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percent = 0
if dead != 0:
percent = 100 / dead
return dead, percent
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@huey.task()
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def calculate_and_clear_dead_packages(job: Jobs):
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Jobs.update(
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job=Job,
status=JobStatus.RUNNING,
progress=0,
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status_text="Calculate the number of dead packages...",
)
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dead_packages, package_equal_to_percent = get_dead_packages(
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run_nix_store_print_dead()
)
if dead_packages == 0:
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Jobs.update(
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job=Job,
status=JobStatus.FINISHED,
progress=100,
status_text="Nothing to clear",
result="System is clear",
)
return
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Jobs.update(
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job=Job,
status=JobStatus.RUNNING,
progress=0,
status_text=f"Found {dead_packages} packages to remove!",
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)
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process_stream(job, run_nix_collect_garbage(), package_equal_to_percent)
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def start_nix_collect_garbage() -> Job:
job = Jobs.add(
type_id="maintenance.collect_nix_garbage",
name="Collect garbage",
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description="Cleaning up unused packages",
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)
calculate_and_clear_dead_packages(job=job)
return job