2024-02-01 05:32:21 +00:00
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import base64
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import json
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import socket
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from pathlib import Path
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from time import sleep
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# qga is almost like qmp, but not quite, because:
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# - server doesn't send initial message
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# - no need to initialize by asking for capabilities
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# - results need to be base64 decoded
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class QgaSession:
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def __init__(self, socket_file: Path | str) -> None:
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self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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2024-02-09 12:46:32 +00:00
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# try to reconnect a couple of times if connection refused
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2024-02-01 05:32:21 +00:00
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for _ in range(100):
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try:
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self.sock.connect(str(socket_file))
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return
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except ConnectionRefusedError:
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sleep(0.1)
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self.sock.connect(str(socket_file))
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def get_response(self) -> dict:
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result = self.sock.recv(9999999)
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return json.loads(result)
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# only execute, don't wait for response
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def exec_cmd(self, cmd: str) -> None:
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self.sock.send(
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json.dumps(
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{
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"execute": "guest-exec",
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"arguments": {
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"path": "/bin/sh",
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"arg": ["-l", "-c", cmd],
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"capture-output": True,
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},
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}
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).encode("utf-8")
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)
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# run, wait for result, return exitcode and output
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2024-05-02 13:02:10 +00:00
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def run(self, cmd: str, check: bool = False) -> tuple[int, str, str]:
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2024-02-01 05:32:21 +00:00
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self.exec_cmd(cmd)
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result_pid = self.get_response()
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pid = result_pid["return"]["pid"]
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# loop until exited=true
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status_payload = json.dumps(
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{
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"execute": "guest-exec-status",
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"arguments": {
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"pid": pid,
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},
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}
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).encode("utf-8")
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while True:
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self.sock.send(status_payload)
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result = self.get_response()
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if "error" in result and result["error"]["desc"].startswith("PID"):
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raise Exception("PID could not be found")
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if result["return"]["exited"]:
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break
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sleep(0.1)
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exitcode = result["return"]["exitcode"]
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stdout = (
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""
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if "out-data" not in result["return"]
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else base64.b64decode(result["return"]["out-data"]).decode("utf-8")
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)
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stderr = (
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""
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if "err-data" not in result["return"]
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else base64.b64decode(result["return"]["err-data"]).decode("utf-8")
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)
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2024-05-02 13:02:10 +00:00
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if check and exitcode != 0:
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raise Exception(
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f"Command on guest failed\nCommand: {cmd}\nExitcode {exitcode}\nStdout: {stdout}\nStderr: {stderr}"
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)
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2024-02-01 05:32:21 +00:00
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return exitcode, stdout, stderr
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