395 lines
11 KiB
Python
395 lines
11 KiB
Python
"""Command line interface."""
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import argparse
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import io
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import logging
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import os
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import shlex
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import sys
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from collections import UserDict
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from typing import Any
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from uuid import uuid4
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import libvirt
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import yaml
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from pydantic import ValidationError
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from compute import __version__
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from compute.exceptions import (
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ComputeServiceError,
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GuestAgentTimeoutExceededError,
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)
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from compute.instance import GuestAgent
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from compute.session import Session
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from compute.utils import ids
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log = logging.getLogger(__name__)
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log_levels = [lv.lower() for lv in logging.getLevelNamesMapping()]
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libvirt.registerErrorHandler(
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lambda userdata, err: None, # noqa: ARG005
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ctx=None,
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)
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class Table:
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"""Minimalistic text table constructor."""
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def __init__(self, whitespace: str | None = None):
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"""Initialise Table."""
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self.whitespace = whitespace or '\t'
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self.header = []
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self.rows = []
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self.table = ''
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def add_row(self, row: list) -> None:
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"""Add table row."""
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self.rows.append([str(col) for col in row])
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def add_rows(self, rows: list[list]) -> None:
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"""Add multiple rows."""
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for row in rows:
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self.add_row(row)
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def __str__(self) -> str:
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"""Build table and return."""
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widths = [max(map(len, col)) for col in zip(*self.rows, strict=True)]
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self.rows.insert(0, [str(h).upper() for h in self.header])
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for row in self.rows:
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self.table += self.whitespace.join(
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(
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val.ljust(width)
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for val, width in zip(row, widths, strict=True)
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)
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)
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self.table += '\n'
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return self.table.strip()
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def _list_instances(session: Session) -> None:
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table = Table()
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table.header = ['NAME', 'STATE']
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for instance in session.list_instances():
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table.add_row(
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[
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instance.name,
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instance.get_status(),
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]
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)
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print(table)
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sys.exit()
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def _exec_guest_agent_command(
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session: Session, args: argparse.Namespace
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) -> None:
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instance = session.get_instance(args.instance)
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ga = GuestAgent(instance.domain, timeout=args.timeout)
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arguments = args.arguments.copy()
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if len(arguments) > 1 and not args.no_join_args:
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arguments = [shlex.join(arguments)]
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if not args.no_join_args:
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arguments.insert(0, '-c')
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stdin = None
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if not sys.stdin.isatty():
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stdin = sys.stdin.read()
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try:
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output = ga.guest_exec(
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path=args.executable,
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args=arguments,
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env=args.env,
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stdin=stdin,
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capture_output=True,
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decode_output=True,
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poll=True,
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)
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except GuestAgentTimeoutExceededError as e:
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sys.exit(
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f'{e}. NOTE: command may still running in guest, '
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f'PID={ga.last_pid}'
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)
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if output.stderr:
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print(output.stderr.strip(), file=sys.stderr)
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if output.stdout:
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print(output.stdout.strip(), file=sys.stdout)
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sys.exit(output.exitcode)
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class _NotPresent:
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"""
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Type for representing non-existent dictionary keys.
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See :class:`_FillableDict`.
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"""
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class _FillableDict(UserDict):
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"""Use :method:`fill` to add key if not present."""
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def __init__(self, data: dict):
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self.data = data
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def fill(self, key: str, value: Any) -> None: # noqa: ANN401
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if self.data.get(key, _NotPresent) is _NotPresent:
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self.data[key] = value
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def _merge_dicts(a: dict, b: dict, path: list[str] | None = None) -> dict:
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"""Merge `b` into `a`. Return modified `a`."""
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if path is None:
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path = []
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for key in b:
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if key in a:
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if isinstance(a[key], dict) and isinstance(b[key], dict):
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_merge_dicts(a[key], b[key], [path + str(key)])
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elif a[key] == b[key]:
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pass # same leaf value
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else:
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a[key] = b[key] # replace existing key's values
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else:
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a[key] = b[key]
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return a
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def _create_instance(session: Session, file: io.TextIOWrapper) -> None:
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try:
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data = _FillableDict(yaml.load(file.read(), Loader=yaml.SafeLoader))
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log.debug('Read from file: %s', data)
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except yaml.YAMLError as e:
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sys.exit(f'error: cannot parse YAML: {e}')
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capabilities = session.get_capabilities()
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node_info = session.get_node_info()
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data.fill('name', uuid4().hex)
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data.fill('title', None)
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data.fill('description', None)
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data.fill('arch', capabilities.arch)
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data.fill('machine', capabilities.machine)
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data.fill('emulator', capabilities.emulator)
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data.fill('max_vcpus', node_info.cpus)
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data.fill('max_memory', node_info.memory)
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data.fill('cpu', {})
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cpu = {
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'emulation_mode': 'host-passthrough',
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'model': None,
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'vendor': None,
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'topology': None,
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'features': None,
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}
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data['cpu'] = _merge_dicts(data['cpu'], cpu)
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data.fill(
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'network_interfaces',
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[{'source': 'default', 'mac': ids.random_mac()}],
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)
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data.fill('boot', {'order': ['cdrom', 'hd']})
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try:
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log.debug('Input data: %s', data)
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session.create_instance(**data)
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except ValidationError as e:
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for error in e.errors():
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fields = '.'.join([str(lc) for lc in error['loc']])
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print(
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f"validation error: {fields}: {error['msg']}",
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file=sys.stderr,
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)
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sys.exit()
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def main(session: Session, args: argparse.Namespace) -> None:
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"""Perform actions."""
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match args.command:
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case 'create':
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_create_instance(session, args.file)
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case 'exec':
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_exec_guest_agent_command(session, args)
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case 'ls':
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_list_instances(session)
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case 'start':
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instance = session.get_instance(args.instance)
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instance.start()
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case 'shutdown':
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instance = session.get_instance(args.instance)
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instance.shutdown(args.method)
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case 'reboot':
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instance = session.get_instance(args.instance)
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instance.reboot()
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case 'reset':
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instance = session.get_instance(args.instance)
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instance.reset()
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case 'status':
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instance = session.get_instance(args.instance)
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print(instance.status)
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case 'setvcpus':
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instance = session.get_instance(args.instance)
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instance.set_vcpus(args.nvcpus, live=True)
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def cli() -> None: # noqa: PLR0915
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"""Parse command line arguments."""
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root = argparse.ArgumentParser(
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prog='compute',
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description='manage compute instances and storage volumes.',
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formatter_class=argparse.RawTextHelpFormatter,
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)
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root.add_argument(
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'-v',
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'--verbose',
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action='store_true',
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default=False,
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help='enable verbose mode',
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)
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root.add_argument(
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'-c',
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'--connect',
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metavar='URI',
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default='qemu:///system',
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help='libvirt connection URI',
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)
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root.add_argument(
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'-l',
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'--log-level',
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type=str.lower,
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metavar='LEVEL',
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choices=log_levels,
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help='log level [envvar: CMP_LOG]',
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)
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root.add_argument(
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'-V',
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'--version',
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action='version',
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version=__version__,
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)
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subparsers = root.add_subparsers(dest='command', metavar='COMMAND')
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# create command
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create = subparsers.add_parser(
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'create', help='create new instance from YAML config file'
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)
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create.add_argument(
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'file',
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type=argparse.FileType('r', encoding='UTF-8'),
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)
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# exec subcommand
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execute = subparsers.add_parser(
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'exec',
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help='execute command in guest via guest agent',
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description=(
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'NOTE: any argument after instance name will be passed into '
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'guest as shell command.'
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),
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)
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execute.add_argument('instance')
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execute.add_argument('arguments', nargs=argparse.REMAINDER)
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execute.add_argument(
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'-t',
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'--timeout',
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type=int,
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default=60,
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help=(
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'waiting time in seconds for a command to be executed '
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'in guest, 60 sec by default'
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),
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)
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execute.add_argument(
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'-x',
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'--executable',
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default='/bin/sh',
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help='path to executable in guest, /bin/sh by default',
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)
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execute.add_argument(
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'-e',
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'--env',
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type=str,
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nargs='?',
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action='append',
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help='environment variables to pass to executable in guest',
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)
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execute.add_argument(
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'-n',
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'--no-join-args',
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action='store_true',
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default=False,
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help=(
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"do not join arguments list and add '-c' option, suitable "
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'for non-shell executables and other specific cases.'
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),
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)
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# ls subcommand
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listall = subparsers.add_parser('ls', help='list instances')
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listall.add_argument(
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'-a',
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'--all',
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action='store_true',
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default=False,
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help='list all instances including inactive',
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)
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# start subcommand
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start = subparsers.add_parser('start', help='start instance')
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start.add_argument('instance')
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# shutdown subcommand
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shutdown = subparsers.add_parser('shutdown', help='shutdown instance')
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shutdown.add_argument('instance')
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shutdown.add_argument(
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'-m',
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'--method',
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choices=['soft', 'normal', 'hard', 'unsafe'],
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default='normal',
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help='use shutdown method',
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)
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# reboot subcommand
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reboot = subparsers.add_parser('reboot', help='reboot instance')
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reboot.add_argument('instance')
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# reset subcommand
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reset = subparsers.add_parser('reset', help='reset instance')
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reset.add_argument('instance')
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# status subcommand
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status = subparsers.add_parser('status', help='display instance status')
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status.add_argument('instance')
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# setvcpus subcommand
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setvcpus = subparsers.add_parser('setvcpus', help='set vCPU number')
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setvcpus.add_argument('instance')
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setvcpus.add_argument('nvcpus', type=int)
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# Run parser
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args = root.parse_args()
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if args.command is None:
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root.print_help()
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sys.exit()
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# Set logging level
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log_level = args.log_level or os.getenv('CMP_LOG')
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if isinstance(log_level, str) and log_level.lower() in log_levels:
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logging.basicConfig(
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level=logging.getLevelNamesMapping()[log_level.upper()]
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)
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log.debug('CLI started with args: %s', args)
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# Perform actions
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try:
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with Session(args.connect) as session:
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main(session, args)
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except ComputeServiceError as e:
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sys.exit(f'error: {e}')
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except KeyboardInterrupt:
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sys.exit()
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except SystemExit as e:
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sys.exit(e)
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except Exception as e: # noqa: BLE001
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sys.exit(f'unexpected error {type(e)}: {e}')
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if __name__ == '__main__':
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cli()
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