#!/usr/bin/python3 import asyncio import json import logging import socket import sys import tempfile from dataclasses import dataclass from pathlib import Path import aiohttp logger = logging.getLogger(__name__) class WebdriverError(RuntimeError): pass @dataclass class LogMessage: level: str # like "info" type: str # usually "console" timestamp: int args: list[object] text: str def __init__(self, message_params): self.level = message_params["level"] self.type = message_params["type"] self.timestamp = message_params["timestamp"] self.args = message_params.get("args", []) self.text = message_params["text"] def __str__(self): return f"LogMessage: {self.type} {self.level} @{self.timestamp}: {self.text} {self.args}" @dataclass class BidiSession: ws_url: str session_url: str process: asyncio.subprocess.Process # Return port numbers that were free at the time of checking # They might be in use again by the time the function returns... def pick_ports(count: int) -> list[int]: sockets: list[socket.socket] = [] ports: list[int] = [] for _ in range(count): sock = socket.socket() sock.bind(('127.0.0.1', 0)) sockets.append(sock) ports.append(sock.getsockname()[1]) for s in sockets: s.close() return ports class WebdriverBidi: def __init__(self, headless=False) -> None: self.headless = headless self.last_id = 0 self.pending_commands: dict[int, asyncio.Future] = {} self.logs: list[LogMessage] = [] self.bidi_session: BidiSession | None = None self.future_wait_page_load = None async def start_bidi_session(self) -> None: raise NotImplementedError('must be implemented by concrete subclass') async def close_bidi_session(self) -> None: raise NotImplementedError('must be implemented by concrete subclass') async def close(self): assert self.bidi_session is not None logger.debug("cleaning up webdriver") self.task_reader.cancel() del self.task_reader await self.ws.close() await self.close_bidi_session() self.bidi_session.process.terminate() await self.bidi_session.process.wait() self.bidi_session = None await self.http_session.close() async def start_session(self) -> None: self.http_session = aiohttp.ClientSession(raise_for_status=True) await self.start_bidi_session() assert self.bidi_session self.ws = await self.http_session.ws_connect(self.bidi_session.ws_url) self.task_reader = asyncio.create_task(self.ws_reader(self.ws), name="bidi_reader") async def __aenter__(self): await self.start_session() return self async def __aexit__(self, *_excinfo): if self.bidi_session is not None: await self.close() async def ws_reader(self, ws: aiohttp.client.ClientWebSocketResponse) -> None: async for msg in ws: if msg.type == aiohttp.WSMsgType.TEXT: data = json.loads(msg.data) logger.debug("ws TEXT → %r", data) if "id" in data and data["id"] in self.pending_commands: logger.debug("ws_reader: resolving pending command %i", data["id"]) if data["type"] == "success": self.pending_commands[data["id"]].set_result(data["result"]) else: self.pending_commands[data["id"]].set_exception( WebdriverError(f"{data['type']}: {data['message']}")) del self.pending_commands[data["id"]] continue if data["type"] == "event": if data["method"] == "log.entryAdded": self.logs.append(LogMessage(data["params"])) continue if data["method"] == "browsingContext.domContentLoaded": logger.debug("page loaded: %r", data["params"]) if self.future_wait_page_load: self.future_wait_page_load.set_result(data["params"]["url"]) continue logger.warning("ws_reader: unhandled message %r", data) elif msg.type == aiohttp.WSMsgType.ERROR: logger.error("BiDi failure: %s", msg) break async def bidi(self, method, **params) -> asyncio.Future: """Send a Webdriver BiDi command and return the JSON response""" payload = json.dumps({"id": self.last_id, "method": method, "params": params}) logger.debug("ws ← %r", payload) await self.ws.send_str(payload) future = asyncio.get_event_loop().create_future() self.pending_commands[self.last_id] = future self.last_id += 1 return await future def arm_page_load(self): assert self.future_wait_page_load is None, "already waiting for page load" self.future_wait_page_load = asyncio.get_event_loop().create_future() async def wait_page_load(self): assert self.future_wait_page_load is not None, "call arm_page_load() first" return await self.future_wait_page_load async def run(self): # wait for browser to initialize default context for _ in range(10): realms = (await self.bidi("script.getRealms"))["realms"] if len(realms) > 0: context = realms[0]["context"] break else: raise WebdriverError("timed out waiting for default realm") await self.bidi("session.subscribe", events=[ "log.entryAdded", "browsingContext.domContentLoaded", ]) await self.bidi("script.evaluate", expression="console.log('Hello BiDi')", awaitPromise=False, target={"context": context}) await self.bidi("browsingContext.navigate", context=context, url="https://piware.de", wait="complete") r = (await self.bidi("browsingContext.locateNodes", context=context, locator={"type": "css", "value": "#menu-content"}))["nodes"] assert len(r) == 1 r = await self.bidi("script.evaluate", expression="document.querySelector('#menu-content').textContent", awaitPromise=False, target={"context": context}) assert 'Addicted to Free Software Development' in r['result']['value'] # locate first social link r = (await self.bidi("browsingContext.locateNodes", context=context, locator={"type": "css", "value": "a[rel='me']:first-child"}))["nodes"] assert len(r) == 1 self.arm_page_load() # click it await self.bidi("input.performActions", context=context, actions=[ { "id": "pointer-0", "type": "pointer", "parameters": {"pointerType": "mouse"}, "actions": [ {"type": "pointerMove", "x": 0, "y": 0, "origin": {"type": "element", "element": r[0]}}, {"type": "pointerDown", "button": 0}, {"type": "pointerUp", "button": 0}, ], } ]) url = await self.wait_page_load() assert url == "https://github.com/martinpitt/" logger.info("Collected debug messages:") for log in self.logs: logger.info(log) if not self.headless: await asyncio.sleep(3) class ChromiumBidi(WebdriverBidi): async def start_bidi_session(self) -> None: assert self.bidi_session is None chrome_binary = "/usr/lib64/chromium-browser/headless_shell" if self.headless else "/usr/bin/chromium-browser" session_args = {"capabilities": { "alwaysMatch": { "webSocketUrl": True, "goog:chromeOptions": {"binary": chrome_binary}, } }} [webdriver_port] = pick_ports(1) driver = await asyncio.create_subprocess_exec("chromedriver", "--port=" + str(webdriver_port)) wd_url = f"http://localhost:{webdriver_port}" # webdriver needs some time to launch for retry in range(1, 10): try: async with self.http_session.post(f"{wd_url}/session", data=json.dumps(session_args).encode()) as resp: session_info = json.loads(await resp.text())["value"] logger.debug("webdriver session request: %r %r", resp, session_info) break except (IOError, aiohttp.client.ClientResponseError) as e: logger.debug("waiting for webdriver: %s", e) await asyncio.sleep(0.1 * retry) else: raise WebdriverError("could not connect to chromedriver") self.bidi_session = BidiSession( session_url=f"{wd_url}/session/{session_info['sessionId']}", ws_url=session_info["capabilities"]["webSocketUrl"], process=driver) logger.debug("Established chromium session %r", self.bidi_session) async def close_bidi_session(self): await self.http_session.delete(self.bidi_session.session_url) # We could do this with https://github.com/mozilla/geckodriver/releases with a similar protocol as ChromeBidi # But let's use https://firefox-source-docs.mozilla.org/testing/marionette/Protocol.html directly, fewer moving parts class FirefoxBidi(WebdriverBidi): async def start_bidi_session(self) -> None: [marionette_port, bidi_port] = pick_ports(2) self.homedir = tempfile.TemporaryDirectory(prefix="firefox-home-") (Path(self.homedir.name) / 'download').mkdir() self.profiledir = Path(self.homedir.name) / "profile" self.profiledir.mkdir() (self.profiledir / "user.js").write_text(f""" user_pref("remote.enabled", true); user_pref("remote.frames.enabled", true); user_pref("app.update.auto", false); user_pref("datareporting.policy.dataSubmissionEnabled", false); user_pref("toolkit.telemetry.reportingpolicy.firstRun", false); user_pref("dom.disable_beforeunload", true); user_pref("browser.download.dir", "{self.homedir}/download"); user_pref("browser.download.folderList", 2); user_pref("signon.rememberSignons", false); user_pref("dom.navigation.locationChangeRateLimit.count", 9999); // HACK: https://bugzilla.mozilla.org/show_bug.cgi?id=1746154 user_pref("fission.webContentIsolationStrategy", 0); user_pref("fission.bfcacheInParent", false); user_pref('marionette.port', {marionette_port}); """) driver = await asyncio.create_subprocess_exec( "firefox", "-profile", str(self.profiledir), "--marionette", "--no-remote", f"--remote-debugging-port={bidi_port}", *(["-headless"] if self.headless else []), "about:blank") # needs some time to launch for _ in range(1, 30): try: # we must keep this socket open throughout the lifetime of that session reader, self.writer_marionette = await asyncio.open_connection("127.0.0.1", marionette_port) break except ConnectionRefusedError as e: logger.debug("waiting for firefox marionette: %s", e) await asyncio.sleep(1) else: raise WebdriverError("could not connect to firefox marionette") reply = await reader.read(1024) if b'"marionetteProtocol":3' not in reply: raise WebdriverError(f"unexpected marionette reply: {reply.decode()}") cmd = '[0,1,"WebDriver:NewSession",{"webSocketUrl":true}]' self.writer_marionette.write(f"{len(cmd)}:{cmd}".encode()) await self.writer_marionette.drain() reply = await reader.read(1024) # cut off length prefix reply = json.loads(reply[reply.index(b":") + 1:].decode()) if not isinstance(reply, list) or len(reply) != 4 or not isinstance(reply[3], dict): raise WebdriverError(f"unexpected marionette session request reply: {reply!r}") logger.debug("marionette session request reply: %s", reply) url = reply[3]["capabilities"]["webSocketUrl"] self.bidi_session = BidiSession(session_url=url, ws_url=url, process=driver) logger.debug("Established firefox session %r", self.bidi_session) async def close_bidi_session(self): self.writer_marionette.close() await self.writer_marionette.wait_closed() async def main(): logging.basicConfig(level=logging.DEBUG) cls = FirefoxBidi if len(sys.argv) > 1 and sys.argv[1] == "firefox" else ChromiumBidi async with cls(headless=True if len(sys.argv) > 2 and sys.argv[2] == 'headless' else False) as d: await d.run() asyncio.run(main())