101 lines
3.2 KiB
Python
101 lines
3.2 KiB
Python
"""
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Unix socket client — sends commands to the native host relay socket.
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Used by both the CLI and the public Python API.
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Profile selection order:
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1. Explicit `profile` argument to send_command()
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2. BROWSER_CLI_PROFILE environment variable
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3. First entry in /tmp/browser-cli-registry.json
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4. Fallback: /tmp/browser-cli-default.sock
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"""
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import json
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import os
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import socket
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import struct
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import uuid
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from pathlib import Path
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from typing import Any
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REGISTRY_PATH = Path("/tmp/browser-cli-registry.json")
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DEFAULT_SOCKET = "/tmp/browser-cli-default.sock"
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class BrowserNotConnected(Exception):
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"""Raised when the native host socket is not available."""
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def _resolve_socket(profile: str | None = None) -> str:
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"""Return the socket path for the given profile (or auto-detect)."""
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target = profile or os.environ.get("BROWSER_CLI_PROFILE")
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if target:
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if REGISTRY_PATH.exists():
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try:
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reg = json.loads(REGISTRY_PATH.read_text())
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if target in reg:
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return reg[target]
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except Exception:
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pass
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safe = target.replace(" ", "_").replace("/", "_")
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return f"/tmp/browser-cli-{safe}.sock"
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# Auto-detect: use first registered entry
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if REGISTRY_PATH.exists():
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try:
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reg = json.loads(REGISTRY_PATH.read_text())
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if reg:
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return next(iter(reg.values()))
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except Exception:
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pass
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return DEFAULT_SOCKET
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def send_command(command: str, args: dict | None = None, profile: str | None = None) -> Any:
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"""Send a command to the browser and return the response data."""
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sock_path = _resolve_socket(profile)
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msg = {
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"id": str(uuid.uuid4()),
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"command": command,
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"args": args or {},
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}
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payload = json.dumps(msg).encode("utf-8")
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framed = struct.pack("<I", len(payload)) + payload
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try:
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with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as sock:
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sock.connect(sock_path)
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sock.sendall(framed)
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response = _recv_all(sock)
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except (FileNotFoundError, ConnectionRefusedError, OSError):
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profile_hint = f" (profile: {profile})" if profile else ""
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raise BrowserNotConnected(
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f"Cannot connect to browser{profile_hint}.\n"
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"Make sure:\n"
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" 1. The browser-cli extension is installed and enabled\n"
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" 2. The native host is registered: uv run browser-cli install chrome\n"
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" 3. Your browser is running\n"
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" Tip: use BROWSER_CLI_PROFILE=<name> to select a specific profile"
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)
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result = json.loads(response)
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if not result.get("success", True):
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raise RuntimeError(result.get("error", "unknown error from browser"))
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return result.get("data")
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def _recv_all(sock: socket.socket) -> bytes:
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raw_len = _recv_exact(sock, 4)
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msg_len = struct.unpack("<I", raw_len)[0]
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return _recv_exact(sock, msg_len)
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def _recv_exact(sock: socket.socket, n: int) -> bytes:
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buf = b""
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while len(buf) < n:
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chunk = sock.recv(n - len(buf))
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if not chunk:
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raise ConnectionError("Socket closed before full message received")
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buf += chunk
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return buf
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