Significantly speedup PlatformIO Home loading time by migrating to native Python 3 Asynchronous I/O

HISTORY.rst

@@ -11,6 +11,7 @@ PlatformIO Core 5
 5.0.5 (2021-??-??)
 ~~~~~~~~~~~~~~~~~~
 
+* Significantly speedup PlatformIO Home loading time by migrating to native Python 3 Asynchronous I/O
 * Improved listing of `multicast DNS services <https://docs.platformio.org/page/core/userguide/device/cmd_list.html>`_
 * Check for debug server's "ready_pattern" in "stderr"
 

platformio/commands/home/command.py

@@ -15,17 +15,17 @@
 # pylint: disable=too-many-locals,too-many-statements
 
 import mimetypes
+import os
 import socket
-from os.path import isdir
 
 import click
 
 from platformio import exception
-from platformio.compat import WINDOWS
+from platformio.compat import WINDOWS, ensure_python3
-from platformio.package.manager.core import get_core_package_dir, inject_contrib_pysite
+from platformio.package.manager.core import get_core_package_dir
 
 
-@click.command("home", short_help="UI to manage PlatformIO")
+@click.command("home", short_help="GUI to manage PlatformIO")
 @click.option("--port", type=int, default=8008, help="HTTP port, default=8008")
 @click.option(
     "--host",
@@ -46,60 +46,16 @@ from platformio.package.manager.core import get_core_package_dir, inject_contrib
     ),
 )
 def cli(port, host, no_open, shutdown_timeout):
-    # pylint: disable=import-error, import-outside-toplevel
-
-    # import contrib modules
-    inject_contrib_pysite()
-
-    from autobahn.twisted.resource import WebSocketResource
-    from twisted.internet import reactor
-    from twisted.web import server
-    from twisted.internet.error import CannotListenError
-
-    from platformio.commands.home.rpc.handlers.app import AppRPC
-    from platformio.commands.home.rpc.handlers.ide import IDERPC
-    from platformio.commands.home.rpc.handlers.misc import MiscRPC
-    from platformio.commands.home.rpc.handlers.os import OSRPC
-    from platformio.commands.home.rpc.handlers.piocore import PIOCoreRPC
-    from platformio.commands.home.rpc.handlers.project import ProjectRPC
-    from platformio.commands.home.rpc.handlers.account import AccountRPC
-    from platformio.commands.home.rpc.server import JSONRPCServerFactory
-    from platformio.commands.home.web import WebRoot
-
-    factory = JSONRPCServerFactory(shutdown_timeout)
-    factory.addHandler(AppRPC(), namespace="app")
-    factory.addHandler(IDERPC(), namespace="ide")
-    factory.addHandler(MiscRPC(), namespace="misc")
-    factory.addHandler(OSRPC(), namespace="os")
-    factory.addHandler(PIOCoreRPC(), namespace="core")
-    factory.addHandler(ProjectRPC(), namespace="project")
-    factory.addHandler(AccountRPC(), namespace="account")
-
-    contrib_dir = get_core_package_dir("contrib-piohome")
-    if not isdir(contrib_dir):
-        raise exception.PlatformioException("Invalid path to PIO Home Contrib")
-
     # Ensure PIO Home mimetypes are known
     mimetypes.add_type("text/html", ".html")
     mimetypes.add_type("text/css", ".css")
     mimetypes.add_type("application/javascript", ".js")
 
-    root = WebRoot(contrib_dir)
-    root.putChild(b"wsrpc", WebSocketResource(factory))
-    site = server.Site(root)
-
     # hook for `platformio-node-helpers`
     if host == "__do_not_start__":
         return
 
-    already_started = is_port_used(host, port)
     home_url = "http://%s:%d" % (host, port)
-    if not no_open:
-        if already_started:
-            click.launch(home_url)
-        else:
-            reactor.callLater(1, lambda: click.launch(home_url))
-
     click.echo(
         "\n".join(
             [
@@ -115,21 +71,21 @@ def cli(port, host, no_open, shutdown_timeout):
     click.echo("")
     click.echo("Open PlatformIO Home in your browser by this URL => %s" % home_url)
 
-    try:
+    if is_port_used(host, port):
-        reactor.listenTCP(port, site, interface=host)
-    except CannotListenError as e:
-        click.secho(str(e), fg="red", err=True)
-        already_started = True
-
-    if already_started:
         click.secho(
             "PlatformIO Home server is already started in another process.", fg="yellow"
         )
+        if not no_open:
+            click.launch(home_url)
         return
 
-    click.echo("PIO Home has been started. Press Ctrl+C to shutdown.")
+    run_server(
-
+        host=host,
-    reactor.run()
+        port=port,
+        no_open=no_open,
+        shutdown_timeout=shutdown_timeout,
+        home_url=home_url,
+    )
 
 
 def is_port_used(host, port):
@@ -150,3 +106,54 @@ def is_port_used(host, port):
             return False
 
     return True
+
+
+def run_server(host, port, no_open, shutdown_timeout, home_url):
+    # pylint: disable=import-error, import-outside-toplevel
+
+    ensure_python3()
+
+    import uvicorn
+    from starlette.applications import Starlette
+    from starlette.routing import Mount, WebSocketRoute
+    from starlette.staticfiles import StaticFiles
+
+    from platformio.commands.home.rpc.handlers.account import AccountRPC
+    from platformio.commands.home.rpc.handlers.app import AppRPC
+    from platformio.commands.home.rpc.handlers.ide import IDERPC
+    from platformio.commands.home.rpc.handlers.misc import MiscRPC
+    from platformio.commands.home.rpc.handlers.os import OSRPC
+    from platformio.commands.home.rpc.handlers.piocore import PIOCoreRPC
+    from platformio.commands.home.rpc.handlers.project import ProjectRPC
+    from platformio.commands.home.rpc.server import WebSocketJSONRPCServerFactory
+
+    contrib_dir = get_core_package_dir("contrib-piohome")
+    if not os.path.isdir(contrib_dir):
+        raise exception.PlatformioException("Invalid path to PIO Home Contrib")
+
+    ws_rpc_factory = WebSocketJSONRPCServerFactory(shutdown_timeout)
+    ws_rpc_factory.addHandler(AccountRPC(), namespace="account")
+    ws_rpc_factory.addHandler(AppRPC(), namespace="app")
+    ws_rpc_factory.addHandler(IDERPC(), namespace="ide")
+    ws_rpc_factory.addHandler(MiscRPC(), namespace="misc")
+    ws_rpc_factory.addHandler(OSRPC(), namespace="os")
+    ws_rpc_factory.addHandler(PIOCoreRPC(), namespace="core")
+    ws_rpc_factory.addHandler(ProjectRPC(), namespace="project")
+
+    uvicorn.run(
+        Starlette(
+            routes=[
+                WebSocketRoute("/wsrpc", ws_rpc_factory, name="wsrpc"),
+                Mount("/", StaticFiles(directory=contrib_dir, html=True)),
+            ],
+            on_startup=[
+                lambda: click.echo(
+                    "PIO Home has been started. Press Ctrl+C to shutdown."
+                ),
+                lambda: None if no_open else click.launch(home_url),
+            ],
+        ),
+        host=host,
+        port=port,
+        log_level="warning",
+    )

platformio/commands/home/helpers.py

@@ -12,36 +12,24 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# pylint: disable=keyword-arg-before-vararg,arguments-differ,signature-differs
-
 import requests
-from twisted.internet import defer  # pylint: disable=import-error
+from starlette.concurrency import run_in_threadpool
-from twisted.internet import reactor  # pylint: disable=import-error
-from twisted.internet import threads  # pylint: disable=import-error
 
 from platformio import util
 from platformio.proc import where_is_program
 
 
 class AsyncSession(requests.Session):
-    def __init__(self, n=None, *args, **kwargs):
+    async def request(  # pylint: disable=signature-differs,invalid-overridden-method
-        if n:
+        self, *args, **kwargs
-            pool = reactor.getThreadPool()
+    ):
-            pool.adjustPoolsize(0, n)
-
-        super(AsyncSession, self).__init__(*args, **kwargs)
-
-    def request(self, *args, **kwargs):
         func = super(AsyncSession, self).request
-        return threads.deferToThread(func, *args, **kwargs)
+        return await run_in_threadpool(func, *args, **kwargs)
-
-    def wrap(self, *args, **kwargs):  # pylint: disable=no-self-use
-        return defer.ensureDeferred(*args, **kwargs)
 
 
 @util.memoized(expire="60s")
 def requests_session():
-    return AsyncSession(n=5)
+    return AsyncSession()
 
 
 @util.memoized(expire="60s")

platformio/commands/home/rpc/handlers/account.py

@@ -12,12 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import jsonrpc  # pylint: disable=import-error
+import jsonrpc
 
 from platformio.clients.account import AccountClient
 
 
-class AccountRPC(object):
+class AccountRPC:
     @staticmethod
     def call_client(method, *args, **kwargs):
         try:

platformio/commands/home/rpc/handlers/app.py

@@ -20,7 +20,7 @@ from platformio import __version__, app, fs, util
 from platformio.project.helpers import get_project_core_dir, is_platformio_project
 
 
-class AppRPC(object):
+class AppRPC:
 
     APPSTATE_PATH = join(get_project_core_dir(), "homestate.json")
 

platformio/commands/home/rpc/handlers/ide.py

@@ -14,11 +14,12 @@
 
 import time
 
-import jsonrpc  # pylint: disable=import-error
+import jsonrpc
-from twisted.internet import defer  # pylint: disable=import-error
+
+from platformio.compat import get_running_loop
 
 
-class IDERPC(object):
+class IDERPC:
     def __init__(self):
         self._queue = {}
 
@@ -28,14 +29,14 @@ class IDERPC(object):
                 code=4005, message="PIO Home IDE agent is not started"
             )
         while self._queue[sid]:
-            self._queue[sid].pop().callback(
+            self._queue[sid].pop().set_result(
                 {"id": time.time(), "method": command, "params": params}
             )
 
     def listen_commands(self, sid=0):
         if sid not in self._queue:
             self._queue[sid] = []
-        self._queue[sid].append(defer.Deferred())
+        self._queue[sid].append(get_running_loop().create_future())
         return self._queue[sid][-1]
 
     def open_project(self, sid, project_dir):

platformio/commands/home/rpc/handlers/misc.py

@@ -15,14 +15,13 @@
 import json
 import time
 
-from twisted.internet import defer, reactor  # pylint: disable=import-error
-
 from platformio.cache import ContentCache
 from platformio.commands.home.rpc.handlers.os import OSRPC
+from platformio.compat import create_task
 
 
-class MiscRPC(object):
+class MiscRPC:
-    def load_latest_tweets(self, data_url):
+    async def load_latest_tweets(self, data_url):
         cache_key = ContentCache.key_from_args(data_url, "tweets")
         cache_valid = "180d"
         with ContentCache() as cc:
@@ -31,22 +30,20 @@ class MiscRPC(object):
                 cache_data = json.loads(cache_data)
                 # automatically update cache in background every 12 hours
                 if cache_data["time"] < (time.time() - (3600 * 12)):
-                    reactor.callLater(
+                    create_task(
-                        5, self._preload_latest_tweets, data_url, cache_key, cache_valid
+                        self._preload_latest_tweets(data_url, cache_key, cache_valid)
                     )
                 return cache_data["result"]
 
-        result = self._preload_latest_tweets(data_url, cache_key, cache_valid)
+        return await self._preload_latest_tweets(data_url, cache_key, cache_valid)
-        return result
 
     @staticmethod
-    @defer.inlineCallbacks
+    async def _preload_latest_tweets(data_url, cache_key, cache_valid):
-    def _preload_latest_tweets(data_url, cache_key, cache_valid):
+        result = json.loads((await OSRPC.fetch_content(data_url)))
-        result = json.loads((yield OSRPC.fetch_content(data_url)))
         with ContentCache() as cc:
             cc.set(
                 cache_key,
                 json.dumps({"time": int(time.time()), "result": result}),
                 cache_valid,
             )
-        defer.returnValue(result)
+        return result

platformio/commands/home/rpc/handlers/os.py

@@ -14,25 +14,23 @@
 
 from __future__ import absolute_import
 
+import glob
 import io
 import os
 import shutil
 from functools import cmp_to_key
 
 import click
-from twisted.internet import defer  # pylint: disable=import-error
 
 from platformio import __default_requests_timeout__, fs, util
 from platformio.cache import ContentCache
 from platformio.clients.http import ensure_internet_on
 from platformio.commands.home import helpers
-from platformio.compat import PY2, get_filesystem_encoding, glob_recursive
 
 
-class OSRPC(object):
+class OSRPC:
     @staticmethod
-    @defer.inlineCallbacks
+    async def fetch_content(uri, data=None, headers=None, cache_valid=None):
-    def fetch_content(uri, data=None, headers=None, cache_valid=None):
         if not headers:
             headers = {
                 "User-Agent": (
@@ -46,18 +44,18 @@ class OSRPC(object):
             if cache_key:
                 result = cc.get(cache_key)
                 if result is not None:
-                    defer.returnValue(result)
+                    return result
 
         # check internet before and resolve issue with 60 seconds timeout
         ensure_internet_on(raise_exception=True)
 
         session = helpers.requests_session()
         if data:
-            r = yield session.post(
+            r = await session.post(
                 uri, data=data, headers=headers, timeout=__default_requests_timeout__
             )
         else:
-            r = yield session.get(
+            r = await session.get(
                 uri, headers=headers, timeout=__default_requests_timeout__
             )
 
@@ -66,11 +64,11 @@ class OSRPC(object):
         if cache_valid:
             with ContentCache() as cc:
                 cc.set(cache_key, result, cache_valid)
-        defer.returnValue(result)
+        return result
 
-    def request_content(self, uri, data=None, headers=None, cache_valid=None):
+    async def request_content(self, uri, data=None, headers=None, cache_valid=None):
         if uri.startswith("http"):
-            return self.fetch_content(uri, data, headers, cache_valid)
+            return await self.fetch_content(uri, data, headers, cache_valid)
         if os.path.isfile(uri):
             with io.open(uri, encoding="utf-8") as fp:
                 return fp.read()
@@ -82,13 +80,11 @@ class OSRPC(object):
 
     @staticmethod
     def reveal_file(path):
-        return click.launch(
+        return click.launch(path, locate=True)
-            path.encode(get_filesystem_encoding()) if PY2 else path, locate=True
-        )
 
     @staticmethod
     def open_file(path):
-        return click.launch(path.encode(get_filesystem_encoding()) if PY2 else path)
+        return click.launch(path)
 
     @staticmethod
     def is_file(path):
@@ -121,7 +117,9 @@ class OSRPC(object):
         result = set()
         for pathname in pathnames:
             result |= set(
-                glob_recursive(os.path.join(root, pathname) if root else pathname)
+                glob.glob(
+                    os.path.join(root, pathname) if root else pathname, recursive=True
+                )
             )
         return list(result)
 

platformio/commands/home/rpc/handlers/piocore.py

@@ -17,23 +17,15 @@ from __future__ import absolute_import
 import json
 import os
 import sys
-from io import BytesIO, StringIO
+from io import StringIO
 
 import click
-import jsonrpc  # pylint: disable=import-error
+import jsonrpc
-from twisted.internet import defer  # pylint: disable=import-error
+from starlette.concurrency import run_in_threadpool
-from twisted.internet import threads  # pylint: disable=import-error
-from twisted.internet import utils  # pylint: disable=import-error
 
-from platformio import __main__, __version__, fs
+from platformio import __main__, __version__, fs, proc
 from platformio.commands.home import helpers
-from platformio.compat import (
+from platformio.compat import get_locale_encoding, is_bytes
-    PY2,
-    get_filesystem_encoding,
-    get_locale_encoding,
-    is_bytes,
-    string_types,
-)
 
 try:
     from thread import get_ident as thread_get_ident
@@ -52,13 +44,11 @@ class MultiThreadingStdStream(object):
 
     def _ensure_thread_buffer(self, thread_id):
         if thread_id not in self._buffers:
-            self._buffers[thread_id] = BytesIO() if PY2 else StringIO()
+            self._buffers[thread_id] = StringIO()
 
     def write(self, value):
         thread_id = thread_get_ident()
         self._ensure_thread_buffer(thread_id)
-        if PY2 and isinstance(value, unicode):  # pylint: disable=undefined-variable
-            value = value.encode()
         return self._buffers[thread_id].write(
             value.decode() if is_bytes(value) else value
         )
@@ -74,7 +64,7 @@ class MultiThreadingStdStream(object):
         return result
 
 
-class PIOCoreRPC(object):
+class PIOCoreRPC:
     @staticmethod
     def version():
         return __version__
@@ -89,16 +79,9 @@ class PIOCoreRPC(object):
         sys.stderr = PIOCoreRPC.thread_stderr
 
     @staticmethod
-    def call(args, options=None):
+    async def call(args, options=None):
-        return defer.maybeDeferred(PIOCoreRPC._call_generator, args, options)
-
-    @staticmethod
-    @defer.inlineCallbacks
-    def _call_generator(args, options=None):
         for i, arg in enumerate(args):
-            if isinstance(arg, string_types):
+            if not isinstance(arg, str):
-                args[i] = arg.encode(get_filesystem_encoding()) if PY2 else arg
-            else:
                 args[i] = str(arg)
 
         options = options or {}
@@ -106,27 +89,34 @@ class PIOCoreRPC(object):
 
         try:
             if options.get("force_subprocess"):
-                result = yield PIOCoreRPC._call_subprocess(args, options)
+                result = await PIOCoreRPC._call_subprocess(args, options)
-                defer.returnValue(PIOCoreRPC._process_result(result, to_json))
+                return PIOCoreRPC._process_result(result, to_json)
-            else:
+            result = await PIOCoreRPC._call_inline(args, options)
-                result = yield PIOCoreRPC._call_inline(args, options)
             try:
-                    defer.returnValue(PIOCoreRPC._process_result(result, to_json))
+                return PIOCoreRPC._process_result(result, to_json)
             except ValueError:
                 # fall-back to subprocess method
-                    result = yield PIOCoreRPC._call_subprocess(args, options)
+                result = await PIOCoreRPC._call_subprocess(args, options)
-                    defer.returnValue(PIOCoreRPC._process_result(result, to_json))
+                return PIOCoreRPC._process_result(result, to_json)
         except Exception as e:  # pylint: disable=bare-except
             raise jsonrpc.exceptions.JSONRPCDispatchException(
                 code=4003, message="PIO Core Call Error", data=str(e)
             )
 
     @staticmethod
-    def _call_inline(args, options):
+    async def _call_subprocess(args, options):
-        PIOCoreRPC.setup_multithreading_std_streams()
+        result = await run_in_threadpool(
-        cwd = options.get("cwd") or os.getcwd()
+            proc.exec_command,
+            [helpers.get_core_fullpath()] + args,
+            cwd=options.get("cwd") or os.getcwd(),
+        )
+        return (result["out"], result["err"], result["returncode"])
 
-        def _thread_task():
+    @staticmethod
+    async def _call_inline(args, options):
+        PIOCoreRPC.setup_multithreading_std_streams()
+
+        def _thread_safe_call(args, cwd):
             with fs.cd(cwd):
                 exit_code = __main__.main(["-c"] + args)
             return (
@@ -135,16 +125,8 @@ class PIOCoreRPC(object):
                 exit_code,
             )
 
-        return threads.deferToThread(_thread_task)
+        return await run_in_threadpool(
-
+            _thread_safe_call, args=args, cwd=options.get("cwd") or os.getcwd()
-    @staticmethod
-    def _call_subprocess(args, options):
-        cwd = (options or {}).get("cwd") or os.getcwd()
-        return utils.getProcessOutputAndValue(
-            helpers.get_core_fullpath(),
-            args,
-            path=cwd,
-            env={k: v for k, v in os.environ.items() if "%" not in k},
         )
 
     @staticmethod

platformio/commands/home/rpc/handlers/project.py

@@ -18,12 +18,11 @@ import os
 import shutil
 import time
 
-import jsonrpc  # pylint: disable=import-error
+import jsonrpc
 
 from platformio import exception, fs
 from platformio.commands.home.rpc.handlers.app import AppRPC
 from platformio.commands.home.rpc.handlers.piocore import PIOCoreRPC
-from platformio.compat import PY2, get_filesystem_encoding
 from platformio.ide.projectgenerator import ProjectGenerator
 from platformio.package.manager.platform import PlatformPackageManager
 from platformio.project.config import ProjectConfig
@@ -32,7 +31,7 @@ from platformio.project.helpers import get_project_dir, is_platformio_project
 from platformio.project.options import get_config_options_schema
 
 
-class ProjectRPC(object):
+class ProjectRPC:
     @staticmethod
     def config_call(init_kwargs, method, *args):
         assert isinstance(init_kwargs, dict)
@@ -254,8 +253,6 @@ class ProjectRPC(object):
 
     def import_arduino(self, board, use_arduino_libs, arduino_project_dir):
         board = str(board)
-        if arduino_project_dir and PY2:
-            arduino_project_dir = arduino_project_dir.encode(get_filesystem_encoding())
         # don't import PIO Project
         if is_platformio_project(arduino_project_dir):
             return arduino_project_dir

platformio/commands/home/rpc/server.py

@@ -12,90 +12,112 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# pylint: disable=import-error
+import inspect
+import json
+import sys
 
 import click
 import jsonrpc
-from autobahn.twisted.websocket import WebSocketServerFactory, WebSocketServerProtocol
+from starlette.endpoints import WebSocketEndpoint
-from jsonrpc.exceptions import JSONRPCDispatchException
-from twisted.internet import defer, reactor
 
-from platformio.compat import PY2, dump_json_to_unicode, is_bytes
+from platformio.compat import create_task, get_running_loop, is_bytes
 
 
-class JSONRPCServerProtocol(WebSocketServerProtocol):
+class JSONRPCServerFactoryBase:
-    def onOpen(self):
-        self.factory.connection_nums += 1
-        if self.factory.shutdown_timer:
-            self.factory.shutdown_timer.cancel()
-            self.factory.shutdown_timer = None
 
-    def onClose(self, wasClean, code, reason):  # pylint: disable=unused-argument
-        self.factory.connection_nums -= 1
-        if self.factory.connection_nums == 0:
-            self.factory.shutdownByTimeout()
-
-    def onMessage(self, payload, isBinary):  # pylint: disable=unused-argument
-        # click.echo("> %s" % payload)
-        response = jsonrpc.JSONRPCResponseManager.handle(
-            payload, self.factory.dispatcher
-        ).data
-        # if error
-        if "result" not in response:
-            self.sendJSONResponse(response)
-            return None
-
-        d = defer.maybeDeferred(lambda: response["result"])
-        d.addCallback(self._callback, response)
-        d.addErrback(self._errback, response)
-
-        return None
-
-    def _callback(self, result, response):
-        response["result"] = result
-        self.sendJSONResponse(response)
-
-    def _errback(self, failure, response):
-        if isinstance(failure.value, JSONRPCDispatchException):
-            e = failure.value
-        else:
-            e = JSONRPCDispatchException(code=4999, message=failure.getErrorMessage())
-        del response["result"]
-        response["error"] = e.error._data  # pylint: disable=protected-access
-        self.sendJSONResponse(response)
-
-    def sendJSONResponse(self, response):
-        # click.echo("< %s" % response)
-        if "error" in response:
-            click.secho("Error: %s" % response["error"], fg="red", err=True)
-        response = dump_json_to_unicode(response)
-        if not PY2 and not is_bytes(response):
-            response = response.encode("utf-8")
-        self.sendMessage(response)
-
-
-class JSONRPCServerFactory(WebSocketServerFactory):
-
-    protocol = JSONRPCServerProtocol
     connection_nums = 0
-    shutdown_timer = 0
+    shutdown_timer = None
 
     def __init__(self, shutdown_timeout=0):
-        super(JSONRPCServerFactory, self).__init__()
         self.shutdown_timeout = shutdown_timeout
         self.dispatcher = jsonrpc.Dispatcher()
 
-    def shutdownByTimeout(self):
+    def __call__(self, *args, **kwargs):
+        raise NotImplementedError
+
+    def addHandler(self, handler, namespace):
+        self.dispatcher.build_method_map(handler, prefix="%s." % namespace)
+
+    def on_client_connect(self):
+        self.connection_nums += 1
+        if self.shutdown_timer:
+            self.shutdown_timer.cancel()
+            self.shutdown_timer = None
+
+    def on_client_disconnect(self):
+        self.connection_nums -= 1
+        if self.connection_nums < 1:
+            self.connection_nums = 0
+
+        if self.connection_nums == 0:
+            self.shutdown_by_timeout()
+
+    async def on_shutdown(self):
+        pass
+
+    def shutdown_by_timeout(self):
         if self.shutdown_timeout < 1:
             return
 
         def _auto_shutdown_server():
             click.echo("Automatically shutdown server on timeout")
-            reactor.stop()
+            try:
+                get_running_loop().stop()
+            except:  # pylint: disable=bare-except
+                pass
+            finally:
+                sys.exit(0)
 
-        self.shutdown_timer = reactor.callLater(
+        self.shutdown_timer = get_running_loop().call_later(
             self.shutdown_timeout, _auto_shutdown_server
         )
 
-    def addHandler(self, handler, namespace):
+
-        self.dispatcher.build_method_map(handler, prefix="%s." % namespace)
+class WebSocketJSONRPCServerFactory(JSONRPCServerFactoryBase):
+    def __call__(self, *args, **kwargs):
+        ws = WebSocketJSONRPCServer(*args, **kwargs)
+        ws.factory = self
+        return ws
+
+
+class WebSocketJSONRPCServer(WebSocketEndpoint):
+    encoding = "text"
+    factory: WebSocketJSONRPCServerFactory = None
+
+    async def on_connect(self, websocket):
+        await websocket.accept()
+        self.factory.on_client_connect()  # pylint: disable=no-member
+
+    async def on_receive(self, websocket, data):
+        create_task(self._handle_rpc(websocket, data))
+
+    async def on_disconnect(self, websocket, close_code):
+        self.factory.on_client_disconnect()  # pylint: disable=no-member
+
+    async def _handle_rpc(self, websocket, data):
+        response = jsonrpc.JSONRPCResponseManager.handle(
+            data, self.factory.dispatcher  # pylint: disable=no-member
+        )
+        if response.result and inspect.isawaitable(response.result):
+            try:
+                response.result = await response.result
+                response.data["result"] = response.result
+                response.error = None
+            except Exception as exc:  # pylint: disable=broad-except
+                if not isinstance(exc, jsonrpc.exceptions.JSONRPCDispatchException):
+                    exc = jsonrpc.exceptions.JSONRPCDispatchException(
+                        code=4999, message=str(exc)
+                    )
+                response.result = None
+                response.error = exc.error._data  # pylint: disable=protected-access
+                new_data = response.data.copy()
+                new_data["error"] = response.error
+                del new_data["result"]
+                response.data = new_data
+
+        if response.error:
+            click.secho("Error: %s" % response.error, fg="red", err=True)
+        if "result" in response.data and is_bytes(response.data["result"]):
+            response.data["result"] = response.data["result"].decode("utf-8")
+
+        await websocket.send_text(json.dumps(response.data))

platformio/compat.py

@@ -78,6 +78,12 @@ if PY2:
 
     string_types = (str, unicode)
 
+    def create_task(coro, name=None):
+        raise NotImplementedError
+
+    def get_running_loop():
+        raise NotImplementedError
+
     def is_bytes(x):
         return isinstance(x, (buffer, bytearray))
 
@@ -129,6 +135,12 @@ else:
     import importlib.util
     from glob import escape as glob_escape
 
+    if sys.version_info >= (3, 7):
+        from asyncio import create_task, get_running_loop
+    else:
+        from asyncio import ensure_future as create_task
+        from asyncio import get_event_loop as get_running_loop
+
     string_types = (str,)
 
     def is_bytes(x):

setup.py

@@ -26,19 +26,26 @@ from platformio import (
 from platformio.compat import PY2, WINDOWS
 
 
-install_requires = [
+minimal_requirements = [
-    "bottle<0.13",
+    "bottle==0.12.*",
     "click>=5,<8%s" % (",!=7.1,!=7.1.1" if WINDOWS else ""),
     "colorama",
-    "pyserial>=3,<4,!=3.3",
+    "marshmallow%s" % (">=2,<3" if PY2 else ">=2,<4"),
-    "requests>=2.4.0,<3",
+    "pyelftools>=0.27,<1",
-    "semantic_version>=2.8.1,<3",
+    "pyserial==3.*",
-    "tabulate>=0.8.3,<1",
+    "requests==2.*",
-    "pyelftools>=0.25,<1",
+    "semantic_version==2.8.*",
-    "marshmallow%s" % (">=2,<3" if PY2 else ">=2"),
+    "tabulate==0.8.*",
     "zeroconf==%s" % ("0.19.*" if PY2 else "0.28.*"),
 ]
 
+home_requirements = [
+    "aiofiles==0.6.*",
+    "json-rpc==1.13.*",
+    "starlette==0.14.*",
+    "uvicorn==0.13.*",
+    "wsproto==1.0.*",
+]
 
 setup(
     name=__title__,
@@ -52,7 +59,7 @@ setup(
     python_requires=", ".join(
         [">=2.7", "!=3.0.*", "!=3.1.*", "!=3.2.*", "!=3.3.*", "!=3.4.*"]
     ),
-    install_requires=install_requires,
+    install_requires=minimal_requirements + ([] if PY2 else home_requirements),
     packages=find_packages(exclude=["tests.*", "tests"]) + ["scripts"],
     package_data={
         "platformio": [