220 lines
7 KiB
Python
220 lines
7 KiB
Python
import json
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import logging
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import time
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from pathlib import Path
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from tempfile import NamedTemporaryFile
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from typing import TYPE_CHECKING, Callable, Dict, Optional
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from core import utils
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from core.emulator.data import InterfaceData, LinkOptions
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from core.emulator.distributed import DistributedServer
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from core.emulator.enumerations import NodeTypes
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from core.errors import CoreCommandError
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from core.nodes.base import CoreNode
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from core.nodes.interface import CoreInterface
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logger = logging.getLogger(__name__)
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if TYPE_CHECKING:
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from core.emulator.session import Session
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class LxdClient:
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def __init__(self, name: str, image: str, run: Callable[..., str]) -> None:
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self.name: str = name
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self.image: str = image
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self.run: Callable[..., str] = run
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self.pid: Optional[int] = None
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def create_container(self) -> int:
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self.run(f"lxc launch {self.image} {self.name}")
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data = self.get_info()
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self.pid = data["state"]["pid"]
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return self.pid
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def get_info(self) -> Dict:
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args = f"lxc list {self.name} --format json"
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output = self.run(args)
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data = json.loads(output)
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if not data:
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raise CoreCommandError(1, args, f"LXC({self.name}) not present")
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return data[0]
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def is_alive(self) -> bool:
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try:
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data = self.get_info()
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return data["state"]["status"] == "Running"
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except CoreCommandError:
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return False
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def stop_container(self) -> None:
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self.run(f"lxc delete --force {self.name}")
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def create_cmd(self, cmd: str) -> str:
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return f"lxc exec -nT {self.name} -- {cmd}"
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def create_ns_cmd(self, cmd: str) -> str:
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return f"nsenter -t {self.pid} -m -u -i -p -n {cmd}"
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def check_cmd(self, cmd: str, wait: bool = True, shell: bool = False) -> str:
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args = self.create_cmd(cmd)
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return utils.cmd(args, wait=wait, shell=shell)
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def copy_file(self, src_path: Path, dst_path: Path) -> None:
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if not str(dst_path).startswith("/"):
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dst_path = Path("/root/") / dst_path
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args = f"lxc file push {src_path} {self.name}/{dst_path}"
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self.run(args)
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class LxcNode(CoreNode):
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apitype = NodeTypes.LXC
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def __init__(
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self,
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session: "Session",
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_id: int = None,
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name: str = None,
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directory: str = None,
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server: DistributedServer = None,
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image: str = None,
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) -> None:
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"""
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Create a LxcNode instance.
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:param session: core session instance
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:param _id: object id
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:param name: object name
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:param directory: node directory
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:param server: remote server node
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will run on, default is None for localhost
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:param image: image to start container with
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"""
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super().__init__(session, _id, name, directory, server)
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self.image: str = image if image is not None else "ubuntu"
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self.client: Optional[LxdClient] = None
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def alive(self) -> bool:
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"""
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Check if the node is alive.
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:return: True if node is alive, False otherwise
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"""
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return self.client.is_alive()
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def startup(self) -> None:
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"""
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Startup logic.
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:return: nothing
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"""
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with self.lock:
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if self.up:
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raise ValueError("starting a node that is already up")
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self.makenodedir()
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self.client = LxdClient(self.name, self.image, self.host_cmd)
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self.pid = self.client.create_container()
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self.up = True
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def shutdown(self) -> None:
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"""
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Shutdown logic.
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:return: nothing
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"""
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# nothing to do if node is not up
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if not self.up:
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return
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with self.lock:
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self.ifaces.clear()
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self.client.stop_container()
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self.up = False
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def termcmdstring(self, sh: str = "/bin/sh") -> str:
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"""
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Create a terminal command string.
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:param sh: shell to execute command in
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:return: str
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"""
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return f"lxc exec {self.name} -- {sh}"
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def create_dir(self, dir_path: Path) -> None:
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"""
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Create a private directory.
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:param dir_path: path to create
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:return: nothing
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"""
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logger.info("creating node dir: %s", dir_path)
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args = f"mkdir -p {dir_path}"
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self.cmd(args)
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def mount(self, src_path: Path, target_path: Path) -> None:
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"""
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Create and mount a directory.
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:param src_path: source directory to mount
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:param target_path: target directory to create
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:return: nothing
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:raises CoreCommandError: when a non-zero exit status occurs
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"""
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logger.debug("mounting source(%s) target(%s)", src_path, target_path)
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raise Exception("not supported")
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def create_file(self, file_path: Path, contents: str, mode: int = 0o644) -> None:
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"""
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Create a node file with a given mode.
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:param file_path: name of file to create
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:param contents: contents of file
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:param mode: mode for file
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:return: nothing
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"""
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logger.debug("node(%s) create file(%s) mode(%o)", self.name, file_path, mode)
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temp = NamedTemporaryFile(delete=False)
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temp.write(contents.encode("utf-8"))
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temp.close()
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temp_path = Path(temp.name)
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directory = file_path.parent
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if str(directory) != ".":
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self.cmd(f"mkdir -m {0o755:o} -p {directory}")
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if self.server is not None:
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self.server.remote_put(temp_path, temp_path)
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self.client.copy_file(temp_path, file_path)
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self.cmd(f"chmod {mode:o} {file_path}")
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if self.server is not None:
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self.host_cmd(f"rm -f {temp_path}")
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temp_path.unlink()
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logger.debug("node(%s) added file: %s; mode: 0%o", self.name, file_path, mode)
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def copy_file(self, src_path: Path, dst_path: Path, mode: int = None) -> None:
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"""
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Copy a file to a node, following symlinks and preserving metadata.
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Change file mode if specified.
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:param dst_path: file name to copy file to
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:param src_path: file to copy
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:param mode: mode to copy to
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:return: nothing
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"""
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logger.info(
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"node file copy file(%s) source(%s) mode(%o)", dst_path, src_path, mode or 0
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)
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self.cmd(f"mkdir -p {dst_path.parent}")
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if self.server:
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temp = NamedTemporaryFile(delete=False)
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temp_path = Path(temp.name)
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src_path = temp_path
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self.server.remote_put(src_path, temp_path)
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self.client.copy_file(src_path, dst_path)
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if mode is not None:
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self.cmd(f"chmod {mode:o} {dst_path}")
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def create_iface(
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self, iface_data: InterfaceData = None, options: LinkOptions = None
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) -> CoreInterface:
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iface = super().create_iface(iface_data, options)
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# adding small delay to allow time for adding addresses to work correctly
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time.sleep(0.5)
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return iface
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