new events model

30 files changed, 337 insertions, 167 deletions

diff --git a/kvmd/aiomulti.py b/kvmd/aiomulti.py
index 653651cb..a4537204 100644
--- a/kvmd/aiomulti.py
+++ b/kvmd/aiomulti.py
@@ -59,14 +59,25 @@ def queue_get_last_sync(  # pylint: disable=invalid-name
 # =====
 class AioProcessNotifier:
     def __init__(self) -> None:
-        self.__queue: "multiprocessing.Queue[None]" = multiprocessing.Queue()
-
-    def notify(self) -> None:
-        self.__queue.put_nowait(None)
-
-    async def wait(self) -> None:
-        while not (await queue_get_last(self.__queue, 0.1))[0]:
-            pass
+        self.__queue: "multiprocessing.Queue[int]" = multiprocessing.Queue()
+
+    def notify(self, mask: int=0) -> None:
+        self.__queue.put_nowait(mask)
+
+    async def wait(self) -> int:
+        while True:
+            mask = await aiotools.run_async(self.__get)
+            if mask >= 0:
+                return mask
+
+    def __get(self) -> int:
+        try:
+            mask = self.__queue.get(timeout=0.1)
+            while not self.__queue.empty():
+                mask |= self.__queue.get()
+            return mask
+        except queue.Empty:
+            return -1
 
 
 # =====
diff --git a/kvmd/aiotools.py b/kvmd/aiotools.py
index 5d284a94..b1747f16 100644
--- a/kvmd/aiotools.py
+++ b/kvmd/aiotools.py
@@ -232,25 +232,26 @@ async def close_writer(writer: asyncio.StreamWriter) -> bool:
 # =====
 class AioNotifier:
     def __init__(self) -> None:
-        self.__queue: "asyncio.Queue[None]" = asyncio.Queue()
+        self.__queue: "asyncio.Queue[int]" = asyncio.Queue()
 
-    def notify(self) -> None:
-        self.__queue.put_nowait(None)
+    def notify(self, mask: int=0) -> None:
+        self.__queue.put_nowait(mask)
 
-    async def wait(self, timeout: (float | None)=None) -> None:
+    async def wait(self, timeout: (float | None)=None) -> int:
+        mask = 0
         if timeout is None:
-            await self.__queue.get()
+            mask = await self.__queue.get()
         else:
             try:
-                await asyncio.wait_for(
+                mask = await asyncio.wait_for(
                     asyncio.ensure_future(self.__queue.get()),
                     timeout=timeout,
                 )
             except asyncio.TimeoutError:
-                return  # False
+                return -1
         while not self.__queue.empty():
-            await self.__queue.get()
-        # return True
+            mask |= await self.__queue.get()
+        return mask
 
 
 # =====
diff --git a/kvmd/apps/kvmd/api/export.py b/kvmd/apps/kvmd/api/export.py
index 998c5d81..bb048f53 100644
--- a/kvmd/apps/kvmd/api/export.py
+++ b/kvmd/apps/kvmd/api/export.py
@@ -55,10 +55,9 @@ class ExportApi:
 
     @async_lru.alru_cache(maxsize=1, ttl=5)
     async def __get_prometheus_metrics(self) -> str:
-        (atx_state, hw_state, fan_state, gpio_state) = await asyncio.gather(*[
+        (atx_state, info_state, gpio_state) = await asyncio.gather(*[
             self.__atx.get_state(),
-            self.__info_manager.get_submanager("hw").get_state(),
-            self.__info_manager.get_submanager("fan").get_state(),
+            self.__info_manager.get_state(["hw", "fan"]),
             self.__user_gpio.get_state(),
         ])
         rows: list[str] = []
@@ -72,8 +71,8 @@ class ExportApi:
                     for key in ["online", "state"]:
                         self.__append_prometheus_rows(rows, ch_state["state"], f"pikvm_gpio_{mode}_{key}_{channel}")
 
-        self.__append_prometheus_rows(rows, hw_state["health"], "pikvm_hw")  # type: ignore
-        self.__append_prometheus_rows(rows, fan_state, "pikvm_fan")
+        self.__append_prometheus_rows(rows, info_state["hw"]["health"], "pikvm_hw")  # type: ignore
+        self.__append_prometheus_rows(rows, info_state["fan"], "pikvm_fan")
 
         return "\n".join(rows)
 
diff --git a/kvmd/apps/kvmd/api/info.py b/kvmd/apps/kvmd/api/info.py
index a0be01a5..89d45a84 100644
--- a/kvmd/apps/kvmd/api/info.py
+++ b/kvmd/apps/kvmd/api/info.py
@@ -20,8 +20,6 @@
 # ========================================================================== #
 
 
-import asyncio
-
 from aiohttp.web import Request
 from aiohttp.web import Response
 
@@ -43,15 +41,11 @@ class InfoApi:
     @exposed_http("GET", "/info")
     async def __common_state_handler(self, req: Request) -> Response:
         fields = self.__valid_info_fields(req)
-        results = dict(zip(fields, await asyncio.gather(*[
-            self.__info_manager.get_submanager(field).get_state()
-            for field in fields
-        ])))
-        return make_json_response(results)
+        return make_json_response(await self.__info_manager.get_state(fields))
 
     def __valid_info_fields(self, req: Request) -> list[str]:
-        subs = self.__info_manager.get_subs()
+        available = self.__info_manager.get_subs()
         return sorted(valid_info_fields(
-            arg=req.query.get("fields", ",".join(subs)),
-            variants=subs,
-        ) or subs)
+            arg=req.query.get("fields", ",".join(available)),
+            variants=available,
+        ) or available)
diff --git a/kvmd/apps/kvmd/api/redfish.py b/kvmd/apps/kvmd/api/redfish.py
index e1822496..3b248685 100644
--- a/kvmd/apps/kvmd/api/redfish.py
+++ b/kvmd/apps/kvmd/api/redfish.py
@@ -88,12 +88,12 @@ class RedfishApi:
 
     @exposed_http("GET", "/redfish/v1/Systems/0")
     async def __server_handler(self, _: Request) -> Response:
-        (atx_state, meta_state) = await asyncio.gather(*[
+        (atx_state, info_state) = await asyncio.gather(*[
             self.__atx.get_state(),
-            self.__info_manager.get_submanager("meta").get_state(),
+            self.__info_manager.get_state(["meta"]),
         ])
         try:
-            host = str(meta_state.get("server", {})["host"])  # type: ignore
+            host = str(info_state["meta"].get("server", {})["host"])  # type: ignore
         except Exception:
             host = ""
         return make_json_response({
diff --git a/kvmd/apps/kvmd/info/__init__.py b/kvmd/apps/kvmd/info/__init__.py
index 983ef6d6..b346c10c 100644
--- a/kvmd/apps/kvmd/info/__init__.py
+++ b/kvmd/apps/kvmd/info/__init__.py
@@ -20,6 +20,10 @@
 # ========================================================================== #
 
 
+import asyncio
+
+from typing import AsyncGenerator
+
 from ....yamlconf import Section
 
 from .base import BaseInfoSubmanager
@@ -34,17 +38,50 @@ from .fan import FanInfoSubmanager
 # =====
 class InfoManager:
     def __init__(self, config: Section) -> None:
-        self.__subs = {
+        self.__subs: dict[str, BaseInfoSubmanager] = {
             "system": SystemInfoSubmanager(config.kvmd.streamer.cmd),
-            "auth": AuthInfoSubmanager(config.kvmd.auth.enabled),
-            "meta": MetaInfoSubmanager(config.kvmd.info.meta),
+            "auth":   AuthInfoSubmanager(config.kvmd.auth.enabled),
+            "meta":   MetaInfoSubmanager(config.kvmd.info.meta),
             "extras": ExtrasInfoSubmanager(config),
-            "hw": HwInfoSubmanager(**config.kvmd.info.hw._unpack()),
-            "fan": FanInfoSubmanager(**config.kvmd.info.fan._unpack()),
+            "hw":     HwInfoSubmanager(**config.kvmd.info.hw._unpack()),
+            "fan":    FanInfoSubmanager(**config.kvmd.info.fan._unpack()),
         }
+        self.__queue: "asyncio.Queue[tuple[str, (dict | None)]]" = asyncio.Queue()
 
     def get_subs(self) -> set[str]:
         return set(self.__subs)
 
-    def get_submanager(self, name: str) -> BaseInfoSubmanager:
-        return self.__subs[name]
+    async def get_state(self, fields: (list[str] | None)=None) -> dict:
+        fields = (fields or list(self.__subs))
+        return dict(zip(fields, await asyncio.gather(*[
+            self.__subs[field].get_state()
+            for field in fields
+        ])))
+
+    async def trigger_state(self) -> None:
+        await asyncio.gather(*[
+            sub.trigger_state()
+            for sub in self.__subs.values()
+        ])
+
+    async def poll_state(self) -> AsyncGenerator[dict, None]:
+        while True:
+            (field, value) = await self.__queue.get()
+            yield {field: value}
+
+    async def systask(self) -> None:
+        tasks = [
+            asyncio.create_task(self.__poller(field))
+            for field in self.__subs
+        ]
+        try:
+            await asyncio.gather(*tasks)
+        except Exception:
+            for task in tasks:
+                task.cancel()
+            await asyncio.gather(*tasks, return_exceptions=True)
+            raise
+
+    async def __poller(self, field: str) -> None:
+        async for state in self.__subs[field].poll_state():
+            self.__queue.put_nowait((field, state))
diff --git a/kvmd/apps/kvmd/info/auth.py b/kvmd/apps/kvmd/info/auth.py
index 2077afff..301cffe3 100644
--- a/kvmd/apps/kvmd/info/auth.py
+++ b/kvmd/apps/kvmd/info/auth.py
@@ -20,6 +20,10 @@
 # ========================================================================== #
 
 
+from typing import AsyncGenerator
+
+from .... import aiotools
+
 from .base import BaseInfoSubmanager
 
 
@@ -27,6 +31,15 @@ from .base import BaseInfoSubmanager
 class AuthInfoSubmanager(BaseInfoSubmanager):
     def __init__(self, enabled: bool) -> None:
         self.__enabled = enabled
+        self.__notifier = aiotools.AioNotifier()
 
     async def get_state(self) -> dict:
         return {"enabled": self.__enabled}
+
+    async def trigger_state(self) -> None:
+        self.__notifier.notify()
+
+    async def poll_state(self) -> AsyncGenerator[(dict | None), None]:
+        while True:
+            await self.__notifier.wait()
+            yield (await self.get_state())
diff --git a/kvmd/apps/kvmd/info/base.py b/kvmd/apps/kvmd/info/base.py
index 87494e70..d090ed34 100644
--- a/kvmd/apps/kvmd/info/base.py
+++ b/kvmd/apps/kvmd/info/base.py
@@ -20,7 +20,17 @@
 # ========================================================================== #
 
 
+from typing import AsyncGenerator
+
+
 # =====
 class BaseInfoSubmanager:
     async def get_state(self) -> (dict | None):
         raise NotImplementedError
+
+    async def trigger_state(self) -> None:
+        raise NotImplementedError
+
+    async def poll_state(self) -> AsyncGenerator[(dict | None), None]:
+        yield None
+        raise NotImplementedError
diff --git a/kvmd/apps/kvmd/info/extras.py b/kvmd/apps/kvmd/info/extras.py
index 07225013..a855ad15 100644
--- a/kvmd/apps/kvmd/info/extras.py
+++ b/kvmd/apps/kvmd/info/extras.py
@@ -24,6 +24,8 @@ import os
 import re
 import asyncio
 
+from typing import AsyncGenerator
+
 from ....logging import get_logger
 
 from ....yamlconf import Section
@@ -41,6 +43,7 @@ from .base import BaseInfoSubmanager
 class ExtrasInfoSubmanager(BaseInfoSubmanager):
     def __init__(self, global_config: Section) -> None:
         self.__global_config = global_config
+        self.__notifier = aiotools.AioNotifier()
 
     async def get_state(self) -> (dict | None):
         try:
@@ -65,6 +68,14 @@ class ExtrasInfoSubmanager(BaseInfoSubmanager):
             if sui is not None:
                 await aiotools.shield_fg(sui.close())
 
+    async def trigger_state(self) -> None:
+        self.__notifier.notify()
+
+    async def poll_state(self) -> AsyncGenerator[(dict | None), None]:
+        while True:
+            await self.__notifier.wait()
+            yield (await self.get_state())
+
     def __get_extras_path(self, *parts: str) -> str:
         return os.path.join(self.__global_config.kvmd.info.extras, *parts)
 
diff --git a/kvmd/apps/kvmd/info/fan.py b/kvmd/apps/kvmd/info/fan.py
index 247aff7d..8f3f69c8 100644
--- a/kvmd/apps/kvmd/info/fan.py
+++ b/kvmd/apps/kvmd/info/fan.py
@@ -21,7 +21,6 @@
 
 
 import copy
-import asyncio
 
 from typing import AsyncGenerator
 
@@ -53,6 +52,8 @@ class FanInfoSubmanager(BaseInfoSubmanager):
         self.__timeout = timeout
         self.__state_poll = state_poll
 
+        self.__notifier = aiotools.AioNotifier()
+
     async def get_state(self) -> dict:
         monitored = await self.__get_monitored()
         return {
@@ -60,24 +61,28 @@ class FanInfoSubmanager(BaseInfoSubmanager):
             "state": ((await self.__get_fan_state() if monitored else None)),
         }
 
-    async def poll_state(self) -> AsyncGenerator[dict, None]:
-        prev_state: dict = {}
+    async def trigger_state(self) -> None:
+        self.__notifier.notify(1)
+
+    async def poll_state(self) -> AsyncGenerator[(dict | None), None]:
+        prev: dict = {}
         while True:
             if self.__unix_path:
-                pure = state = await self.get_state()
+                if (await self.__notifier.wait(timeout=self.__state_poll)) > 0:
+                    prev = {}
+                new = await self.get_state()
+                pure = copy.deepcopy(new)
                 if pure["state"] is not None:
                     try:
-                        pure = copy.deepcopy(state)
                         pure["state"]["service"]["now_ts"] = 0
                     except Exception:
                         pass
-                if pure != prev_state:
-                    yield state
-                    prev_state = pure
-                await asyncio.sleep(self.__state_poll)
+                if pure != prev:
+                    prev = pure
+                    yield new
             else:
+                await self.__notifier.wait()
                 yield (await self.get_state())
-                await aiotools.wait_infinite()
 
     # =====
 
diff --git a/kvmd/apps/kvmd/info/hw.py b/kvmd/apps/kvmd/info/hw.py
index 458bc1ec..81cd1af6 100644
--- a/kvmd/apps/kvmd/info/hw.py
+++ b/kvmd/apps/kvmd/info/hw.py
@@ -22,6 +22,7 @@
 
 import os
 import asyncio
+import copy
 
 from typing import Callable
 from typing import AsyncGenerator
@@ -60,6 +61,8 @@ class HwInfoSubmanager(BaseInfoSubmanager):
 
         self.__dt_cache: dict[str, str] = {}
 
+        self.__notifier = aiotools.AioNotifier()
+
     async def get_state(self) -> dict:
         (
             base,
@@ -97,14 +100,18 @@ class HwInfoSubmanager(BaseInfoSubmanager):
             },
         }
 
+    async def trigger_state(self) -> None:
+        self.__notifier.notify(1)
+
     async def poll_state(self) -> AsyncGenerator[dict, None]:
-        prev_state: dict = {}
+        prev: dict = {}
         while True:
-            state = await self.get_state()
-            if state != prev_state:
-                yield state
-                prev_state = state
-            await asyncio.sleep(self.__state_poll)
+            if (await self.__notifier.wait(timeout=self.__state_poll)) > 0:
+                prev = {}
+            new = await self.get_state()
+            if new != prev:
+                prev = copy.deepcopy(new)
+                yield new
 
     # =====
 
diff --git a/kvmd/apps/kvmd/info/meta.py b/kvmd/apps/kvmd/info/meta.py
index b66b76b1..996e648a 100644
--- a/kvmd/apps/kvmd/info/meta.py
+++ b/kvmd/apps/kvmd/info/meta.py
@@ -20,6 +20,8 @@
 # ========================================================================== #
 
 
+from typing import AsyncGenerator
+
 from ....logging import get_logger
 
 from ....yamlconf.loader import load_yaml_file
@@ -33,6 +35,7 @@ from .base import BaseInfoSubmanager
 class MetaInfoSubmanager(BaseInfoSubmanager):
     def __init__(self, meta_path: str) -> None:
         self.__meta_path = meta_path
+        self.__notifier = aiotools.AioNotifier()
 
     async def get_state(self) -> (dict | None):
         try:
@@ -40,3 +43,11 @@ class MetaInfoSubmanager(BaseInfoSubmanager):
         except Exception:
             get_logger(0).exception("Can't parse meta")
         return None
+
+    async def trigger_state(self) -> None:
+        self.__notifier.notify()
+
+    async def poll_state(self) -> AsyncGenerator[(dict | None), None]:
+        while True:
+            await self.__notifier.wait()
+            yield (await self.get_state())
diff --git a/kvmd/apps/kvmd/info/system.py b/kvmd/apps/kvmd/info/system.py
index 462b52c9..d4a450de 100644
--- a/kvmd/apps/kvmd/info/system.py
+++ b/kvmd/apps/kvmd/info/system.py
@@ -24,8 +24,11 @@ import os
 import asyncio
 import platform
 
+from typing import AsyncGenerator
+
 from ....logging import get_logger
 
+from .... import aiotools
 from .... import aioproc
 
 from .... import __version__
@@ -37,6 +40,7 @@ from .base import BaseInfoSubmanager
 class SystemInfoSubmanager(BaseInfoSubmanager):
     def __init__(self, streamer_cmd: list[str]) -> None:
         self.__streamer_cmd = streamer_cmd
+        self.__notifier = aiotools.AioNotifier()
 
     async def get_state(self) -> dict:
         streamer_info = await self.__get_streamer_info()
@@ -50,6 +54,14 @@ class SystemInfoSubmanager(BaseInfoSubmanager):
             },
         }
 
+    async def trigger_state(self) -> None:
+        self.__notifier.notify()
+
+    async def poll_state(self) -> AsyncGenerator[(dict | None), None]:
+        while True:
+            await self.__notifier.wait()
+            yield (await self.get_state())
+
     # =====
 
     async def __get_streamer_info(self) -> dict:
diff --git a/kvmd/apps/kvmd/server.py b/kvmd/apps/kvmd/server.py
index 7e3c7d48..50642725 100644
--- a/kvmd/apps/kvmd/server.py
+++ b/kvmd/apps/kvmd/server.py
@@ -150,6 +150,7 @@ class _Subsystem:
 
 class KvmdServer(HttpServer):  # pylint: disable=too-many-arguments,too-many-instance-attributes
     __EV_GPIO_STATE = "gpio_state"
+    __EV_INFO_STATE = "info_state"
 
     def __init__(  # pylint: disable=too-many-arguments,too-many-locals
         self,
@@ -200,15 +201,12 @@ class KvmdServer(HttpServer):  # pylint: disable=too-many-arguments,too-many-ins
 
         self.__subsystems = [
             _Subsystem.make(auth_manager, "Auth manager"),
-            _Subsystem.make(user_gpio,    "User-GPIO", self.__EV_GPIO_STATE),
-            _Subsystem.make(hid,          "HID",       "hid_state").add_source("hid_keymaps_state", self.__hid_api.get_keymaps, None, None),
-            _Subsystem.make(atx,          "ATX",       "atx_state"),
-            _Subsystem.make(msd,          "MSD",       "msd_state"),
-            _Subsystem.make(streamer,     "Streamer",  "streamer_state").add_source("streamer_ocr_state", self.__streamer_api.get_ocr, None, None),
-            *[
-                _Subsystem.make(info_manager.get_submanager(sub), f"Info manager ({sub})", f"info_{sub}_state",)
-                for sub in sorted(info_manager.get_subs())
-            ],
+            _Subsystem.make(user_gpio,    "User-GPIO",    self.__EV_GPIO_STATE),
+            _Subsystem.make(hid,          "HID",          "hid_state").add_source("hid_keymaps_state", self.__hid_api.get_keymaps, None, None),
+            _Subsystem.make(atx,          "ATX",          "atx_state"),
+            _Subsystem.make(msd,          "MSD",          "msd_state"),
+            _Subsystem.make(streamer,     "Streamer",     "streamer_state").add_source("streamer_ocr_state", self.__streamer_api.get_ocr, None, None),
+            _Subsystem.make(info_manager, "Info manager", self.__EV_INFO_STATE),
         ]
 
         self.__streamer_notifier = aiotools.AioNotifier()
@@ -251,6 +249,7 @@ class KvmdServer(HttpServer):  # pylint: disable=too-many-arguments,too-many-ins
         stream = valid_bool(req.query.get("stream", True))
         legacy = valid_bool(req.query.get("legacy", True))
         async with self._ws_session(req, stream=stream, legacy=legacy) as ws:
+            await ws.send_event("loop", {})
             states = [
                 (event_type, src.get_state())
                 for sub in self.__subsystems
@@ -269,7 +268,6 @@ class KvmdServer(HttpServer):  # pylint: disable=too-many-arguments,too-many-ins
                 for src in sub.sources.values():
                     if src.trigger_state:
                         await src.trigger_state()
-            await ws.send_event("loop", {})
             return (await self._ws_loop(ws))
 
     @exposed_ws("ping")
@@ -366,6 +364,8 @@ class KvmdServer(HttpServer):  # pylint: disable=too-many-arguments,too-many-ins
     async def __poll_state(self, event_type: str, poller: AsyncGenerator[dict, None]) -> None:
         if event_type == self.__EV_GPIO_STATE:
             await self.__poll_gpio_state(poller)
+        elif event_type == self.__EV_INFO_STATE:
+            await self.__poll_info_state(poller)
         else:
             async for state in poller:
                 await self._broadcast_ws_event(event_type, state)
@@ -381,3 +381,9 @@ class KvmdServer(HttpServer):  # pylint: disable=too-many-arguments,too-many-ins
                 prev["state"]["inputs"].update(state["state"].get("inputs", {}))
                 prev["state"]["outputs"].update(state["state"].get("outputs", {}))
             await self._broadcast_ws_event(self.__EV_GPIO_STATE, prev["state"], legacy=True)
+
+    async def __poll_info_state(self, poller: AsyncGenerator[dict, None]) -> None:
+        async for state in poller:
+            await self._broadcast_ws_event(self.__EV_INFO_STATE, state, legacy=False)
+            for (key, value) in state.items():
+                await self._broadcast_ws_event(f"info_{key}_state", value, legacy=True)
diff --git a/kvmd/apps/kvmd/streamer.py b/kvmd/apps/kvmd/streamer.py
index c365e19d..c0a56ad1 100644
--- a/kvmd/apps/kvmd/streamer.py
+++ b/kvmd/apps/kvmd/streamer.py
@@ -26,6 +26,7 @@ import asyncio
 import asyncio.subprocess
 import dataclasses
 import functools
+import copy
 
 from typing import AsyncGenerator
 from typing import Any
@@ -136,7 +137,7 @@ class _StreamerParams:
         }
 
     def get_limits(self) -> dict:
-        limits = dict(self.__limits)
+        limits = copy.deepcopy(self.__limits)
         if self.__has_resolution:
             limits[self.__AVAILABLE_RESOLUTIONS] = list(limits[self.__AVAILABLE_RESOLUTIONS])
         return limits
@@ -323,6 +324,9 @@ class Streamer:  # pylint: disable=too-many-instance-attributes
             "features": self.__params.get_features(),
         }
 
+    async def trigger_state(self) -> None:
+        self.__notifier.notify(1)
+
     async def poll_state(self) -> AsyncGenerator[dict, None]:
         def signal_handler(*_: Any) -> None:
             get_logger(0).info("Got SIGUSR2, checking the stream state ...")
@@ -331,21 +335,14 @@ class Streamer:  # pylint: disable=too-many-instance-attributes
         get_logger(0).info("Installing SIGUSR2 streamer handler ...")
         asyncio.get_event_loop().add_signal_handler(signal.SIGUSR2, signal_handler)
 
-        waiter_task: (asyncio.Task | None) = None
-        prev_state: dict = {}
+        prev: dict = {}
         while True:
-            state = await self.get_state()
-            if state != prev_state:
-                yield state
-                prev_state = state
-
-            if waiter_task is None:
-                waiter_task = asyncio.create_task(self.__notifier.wait())
-            if waiter_task in (await aiotools.wait_first(
-                asyncio.ensure_future(asyncio.sleep(self.__state_poll)),
-                waiter_task,
-            ))[0]:
-                waiter_task = None
+            if (await self.__notifier.wait(timeout=self.__state_poll)) > 0:
+                prev = {}
+            new = await self.get_state()
+            if new != prev:
+                prev = copy.deepcopy(new)
+                yield new
 
     # =====
 
diff --git a/kvmd/apps/kvmd/ugpio.py b/kvmd/apps/kvmd/ugpio.py
index d893d2a0..11c60777 100644
--- a/kvmd/apps/kvmd/ugpio.py
+++ b/kvmd/apps/kvmd/ugpio.py
@@ -234,7 +234,6 @@ class _GpioOutput:  # pylint: disable=too-many-instance-attributes
 class UserGpio:
     def __init__(self, config: Section, otg_config: Section) -> None:
         self.__notifier = aiotools.AioNotifier()
-        self.__full_state_requested = True
 
         self.__drivers = {
             driver: get_ugpio_driver_class(drv_config.type)(
@@ -269,14 +268,12 @@ class UserGpio:
         }
 
     async def trigger_state(self) -> None:
-        self.__full_state_requested = True
-        self.__notifier.notify()
+        self.__notifier.notify(1)
 
     async def poll_state(self) -> AsyncGenerator[dict, None]:
         prev: dict = {"inputs": {}, "outputs": {}}
         while True:  # pylint: disable=too-many-nested-blocks
-            if self.__full_state_requested:
-                self.__full_state_requested = False
+            if (await self.__notifier.wait()) > 0:
                 full = await self.get_state()
                 prev = copy.deepcopy(full["state"])
                 yield full
@@ -285,14 +282,13 @@ class UserGpio:
                 diff: dict = {}
                 for sub in ["inputs", "outputs"]:
                     for ch in new[sub]:
-                        if new[sub][ch] != prev[sub][ch]:
+                        if new[sub][ch] != prev[sub].get(ch):
                             if sub not in diff:
                                 diff[sub] = {}
                             diff[sub][ch] = new[sub][ch]
                 if diff:
                     prev = copy.deepcopy(new)
                     yield {"state": diff}
-            await self.__notifier.wait()
 
     async def __get_io_state(self) -> dict:
         return {
diff --git a/kvmd/apps/vnc/server.py b/kvmd/apps/vnc/server.py
index f8e97050..a6e89311 100644
--- a/kvmd/apps/vnc/server.py
+++ b/kvmd/apps/vnc/server.py
@@ -175,17 +175,18 @@ class _Client(RfbClient):  # pylint: disable=too-many-instance-attributes
             self.__kvmd_ws = None
 
     async def __process_ws_event(self, event_type: str, event: dict) -> None:
-        if event_type == "info_meta_state":
-            try:
-                host = event["server"]["host"]
-            except Exception:
-                host = None
-            else:
-                if isinstance(host, str):
-                    name = f"PiKVM: {host}"
-                    if self._encodings.has_rename:
-                        await self._send_rename(name)
-                    self.__shared_params.name = name
+        if event_type == "info_state":
+            if "meta" in event:
+                try:
+                    host = event["meta"]["server"]["host"]
+                except Exception:
+                    host = None
+                else:
+                    if isinstance(host, str):
+                        name = f"PiKVM: {host}"
+                        if self._encodings.has_rename:
+                            await self._send_rename(name)
+                        self.__shared_params.name = name
 
         elif event_type == "hid_state":
             if self._encodings.has_leds_state:
diff --git a/kvmd/clients/kvmd.py b/kvmd/clients/kvmd.py
index ff8581ef..ddf0d024 100644
--- a/kvmd/clients/kvmd.py
+++ b/kvmd/clients/kvmd.py
@@ -222,7 +222,7 @@ class KvmdClientSession:
     @contextlib.asynccontextmanager
     async def ws(self) -> AsyncGenerator[KvmdClientWs, None]:
         session = self.__ensure_http_session()
-        async with session.ws_connect(self.__make_url("ws")) as ws:
+        async with session.ws_connect(self.__make_url("ws"), params={"legacy": 0}) as ws:
             yield KvmdClientWs(ws)
 
     def __ensure_http_session(self) -> aiohttp.ClientSession:
@@ -267,16 +267,15 @@ class KvmdClient:
         )
 
     def __make_http_session(self, user: str, passwd: str) -> aiohttp.ClientSession:
-        kwargs: dict = {
-            "headers": {
+        return aiohttp.ClientSession(
+            headers={
                 "X-KVMD-User": user,
                 "X-KVMD-Passwd": passwd,
                 "User-Agent": self.__user_agent,
             },
-            "connector": aiohttp.UnixConnector(path=self.__unix_path),
-            "timeout": aiohttp.ClientTimeout(total=self.__timeout),
-        }
-        return aiohttp.ClientSession(**kwargs)
+            connector=aiohttp.UnixConnector(path=self.__unix_path),
+            timeout=aiohttp.ClientTimeout(total=self.__timeout),
+        )
 
     def __make_url(self, handle: str) -> str:
         assert not handle.startswith("/"), handle
diff --git a/kvmd/plugins/atx/__init__.py b/kvmd/plugins/atx/__init__.py
index e9496a65..7545b030 100644
--- a/kvmd/plugins/atx/__init__.py
+++ b/kvmd/plugins/atx/__init__.py
@@ -48,6 +48,9 @@ class BaseAtx(BasePlugin):
     async def get_state(self) -> dict:
         raise NotImplementedError
 
+    async def trigger_state(self) -> None:
+        raise NotImplementedError
+
     async def poll_state(self) -> AsyncGenerator[dict, None]:
         yield {}
         raise NotImplementedError
diff --git a/kvmd/plugins/atx/disabled.py b/kvmd/plugins/atx/disabled.py
index d9abec00..60c2fa5b 100644
--- a/kvmd/plugins/atx/disabled.py
+++ b/kvmd/plugins/atx/disabled.py
@@ -36,6 +36,9 @@ class AtxDisabledError(AtxOperationError):
 
 # =====
 class Plugin(BaseAtx):
+    def __init__(self) -> None:
+        self.__notifier = aiotools.AioNotifier()
+
     async def get_state(self) -> dict:
         return {
             "enabled": False,
@@ -46,10 +49,13 @@ class Plugin(BaseAtx):
             },
         }
 
+    async def trigger_state(self) -> None:
+        self.__notifier.notify()
+
     async def poll_state(self) -> AsyncGenerator[dict, None]:
         while True:
+            await self.__notifier.wait()
             yield (await self.get_state())
-            await aiotools.wait_infinite()
 
     # =====
 
diff --git a/kvmd/plugins/atx/gpio.py b/kvmd/plugins/atx/gpio.py
index 538aafaf..e42b3959 100644
--- a/kvmd/plugins/atx/gpio.py
+++ b/kvmd/plugins/atx/gpio.py
@@ -21,6 +21,7 @@
 
 
 import asyncio
+import copy
 
 from typing import AsyncGenerator
 
@@ -130,14 +131,18 @@ class Plugin(BaseAtx):  # pylint: disable=too-many-instance-attributes
             },
         }
 
+    async def trigger_state(self) -> None:
+        self.__notifier.notify(1)
+
     async def poll_state(self) -> AsyncGenerator[dict, None]:
-        prev_state: dict = {}
+        prev: dict = {}
         while True:
-            state = await self.get_state()
-            if state != prev_state:
-                yield state
-                prev_state = state
-            await self.__notifier.wait()
+            if (await self.__notifier.wait()) > 0:
+                prev = {}
+            new = await self.get_state()
+            if new != prev:
+                prev = copy.deepcopy(new)
+                yield new
 
     async def systask(self) -> None:
         await self.__reader.poll()
diff --git a/kvmd/plugins/hid/__init__.py b/kvmd/plugins/hid/__init__.py
index 1c2efeec..3cba01f4 100644
--- a/kvmd/plugins/hid/__init__.py
+++ b/kvmd/plugins/hid/__init__.py
@@ -63,6 +63,9 @@ class BaseHid(BasePlugin):
     async def get_state(self) -> dict:
         raise NotImplementedError
 
+    async def trigger_state(self) -> None:
+        raise NotImplementedError
+
     async def poll_state(self) -> AsyncGenerator[dict, None]:
         yield {}
         raise NotImplementedError
diff --git a/kvmd/plugins/hid/_mcu/__init__.py b/kvmd/plugins/hid/_mcu/__init__.py
index 53665fb2..e058fd6c 100644
--- a/kvmd/plugins/hid/_mcu/__init__.py
+++ b/kvmd/plugins/hid/_mcu/__init__.py
@@ -23,6 +23,7 @@
 import multiprocessing
 import contextlib
 import queue
+import copy
 import time
 
 from typing import Iterable
@@ -232,14 +233,18 @@ class BaseMcuHid(BaseHid, multiprocessing.Process):  # pylint: disable=too-many-
             **self._get_jiggler_state(),
         }
 
+    async def trigger_state(self) -> None:
+        self.__notifier.notify(1)
+
     async def poll_state(self) -> AsyncGenerator[dict, None]:
-        prev_state: dict = {}
+        prev: dict = {}
         while True:
-            state = await self.get_state()
-            if state != prev_state:
-                yield state
-                prev_state = state
-            await self.__notifier.wait()
+            if (await self.__notifier.wait()) > 0:
+                prev = {}
+            new = await self.get_state()
+            if new != prev:
+                prev = copy.deepcopy(new)
+                yield new
 
     async def reset(self) -> None:
         self.__reset_required_event.set()
diff --git a/kvmd/plugins/hid/bt/__init__.py b/kvmd/plugins/hid/bt/__init__.py
index ece6b59b..bca8f9a5 100644
--- a/kvmd/plugins/hid/bt/__init__.py
+++ b/kvmd/plugins/hid/bt/__init__.py
@@ -21,6 +21,7 @@
 
 
 import multiprocessing
+import copy
 import time
 
 from typing import Iterable
@@ -158,14 +159,18 @@ class Plugin(BaseHid):  # pylint: disable=too-many-instance-attributes
             **self._get_jiggler_state(),
         }
 
+    async def trigger_state(self) -> None:
+        self.__notifier.notify(1)
+
     async def poll_state(self) -> AsyncGenerator[dict, None]:
-        prev_state: dict = {}
+        prev: dict = {}
         while True:
-            state = await self.get_state()
-            if state != prev_state:
-                yield state
-                prev_state = state
-            await self.__notifier.wait()
+            if (await self.__notifier.wait()) > 0:
+                prev = {}
+            new = await self.get_state()
+            if new != prev:
+                prev = copy.deepcopy(new)
+                yield new
 
     async def reset(self) -> None:
         self.clear_events()
diff --git a/kvmd/plugins/hid/ch9329/__init__.py b/kvmd/plugins/hid/ch9329/__init__.py
index 3245505d..f93be95c 100644
--- a/kvmd/plugins/hid/ch9329/__init__.py
+++ b/kvmd/plugins/hid/ch9329/__init__.py
@@ -22,6 +22,7 @@
 
 import multiprocessing
 import queue
+import copy
 import time
 
 from typing import Iterable
@@ -119,14 +120,18 @@ class Plugin(BaseHid, multiprocessing.Process):  # pylint: disable=too-many-inst
             **self._get_jiggler_state(),
         }
 
+    async def trigger_state(self) -> None:
+        self.__notifier.notify(1)
+
     async def poll_state(self) -> AsyncGenerator[dict, None]:
-        prev_state: dict = {}
+        prev: dict = {}
         while True:
-            state = await self.get_state()
-            if state != prev_state:
-                yield state
-                prev_state = state
-            await self.__notifier.wait()
+            if (await self.__notifier.wait()) > 0:
+                prev = {}
+            new = await self.get_state()
+            if new != prev:
+                prev = copy.deepcopy(new)
+                yield new
 
     async def reset(self) -> None:
         self.__reset_required_event.set()
diff --git a/kvmd/plugins/hid/otg/__init__.py b/kvmd/plugins/hid/otg/__init__.py
index 3516546d..7686ebdd 100644
--- a/kvmd/plugins/hid/otg/__init__.py
+++ b/kvmd/plugins/hid/otg/__init__.py
@@ -20,6 +20,8 @@
 # ========================================================================== #
 
 
+import copy
+
 from typing import Iterable
 from typing import AsyncGenerator
 from typing import Any
@@ -150,14 +152,18 @@ class Plugin(BaseHid):  # pylint: disable=too-many-instance-attributes
             **self._get_jiggler_state(),
         }
 
+    async def trigger_state(self) -> None:
+        self.__notifier.notify(1)
+
     async def poll_state(self) -> AsyncGenerator[dict, None]:
-        prev_state: dict = {}
+        prev: dict = {}
         while True:
-            state = await self.get_state()
-            if state != prev_state:
-                yield state
-                prev_state = state
-            await self.__notifier.wait()
+            if (await self.__notifier.wait()) > 0:
+                prev = {}
+            new = await self.get_state()
+            if new != prev:
+                prev = copy.deepcopy(new)
+                yield new
 
     async def reset(self) -> None:
         self.__keyboard_proc.send_reset_event()
diff --git a/kvmd/plugins/msd/__init__.py b/kvmd/plugins/msd/__init__.py
index e0210921..11cd8be5 100644
--- a/kvmd/plugins/msd/__init__.py
+++ b/kvmd/plugins/msd/__init__.py
@@ -117,6 +117,9 @@ class BaseMsd(BasePlugin):
     async def get_state(self) -> dict:
         raise NotImplementedError()
 
+    async def trigger_state(self) -> None:
+        raise NotImplementedError()
+
     async def poll_state(self) -> AsyncGenerator[dict, None]:
         if self is not None:  # XXX: Vulture and pylint hack
             raise NotImplementedError()
diff --git a/kvmd/plugins/msd/disabled.py b/kvmd/plugins/msd/disabled.py
index ad49875e..b9f14f6e 100644
--- a/kvmd/plugins/msd/disabled.py
+++ b/kvmd/plugins/msd/disabled.py
@@ -40,6 +40,9 @@ class MsdDisabledError(MsdOperationError):
 
 # =====
 class Plugin(BaseMsd):
+    def __init__(self) -> None:
+        self.__notifier = aiotools.AioNotifier()
+
     async def get_state(self) -> dict:
         return {
             "enabled": False,
@@ -49,10 +52,13 @@ class Plugin(BaseMsd):
             "drive": None,
         }
 
+    async def trigger_state(self) -> None:
+        self.__notifier.notify()
+
     async def poll_state(self) -> AsyncGenerator[dict, None]:
         while True:
+            await self.__notifier.wait()
             yield (await self.get_state())
-            await aiotools.wait_infinite()
 
     async def reset(self) -> None:
         raise MsdDisabledError()
diff --git a/kvmd/plugins/msd/otg/__init__.py b/kvmd/plugins/msd/otg/__init__.py
index b652cdd0..0bb9f489 100644
--- a/kvmd/plugins/msd/otg/__init__.py
+++ b/kvmd/plugins/msd/otg/__init__.py
@@ -24,6 +24,7 @@ import asyncio
 import contextlib
 import dataclasses
 import functools
+import copy
 import time
 
 from typing import AsyncGenerator
@@ -195,14 +196,18 @@ class Plugin(BaseMsd):  # pylint: disable=too-many-instance-attributes
                 "drive": vd,
             }
 
+    async def trigger_state(self) -> None:
+        self.__notifier.notify(1)
+
     async def poll_state(self) -> AsyncGenerator[dict, None]:
-        prev_state: dict = {}
+        prev: dict = {}
         while True:
-            state = await self.get_state()
-            if state != prev_state:
-                yield state
-                prev_state = state
-            await self.__notifier.wait()
+            if (await self.__notifier.wait()) > 0:
+                prev = {}
+            new = await self.get_state()
+            if new != prev:
+                prev = copy.deepcopy(new)
+                yield new
 
     async def systask(self) -> None:
         await self.__watch_inotify()
diff --git a/web/share/js/kvm/session.js b/web/share/js/kvm/session.js
index 353815da..22cefe89 100644
--- a/web/share/js/kvm/session.js
+++ b/web/share/js/kvm/session.js
@@ -62,9 +62,21 @@ export function Session() {
 
 	/************************************************************************/
 
-	var __setAboutInfoMeta = function(state) {
+	var __setInfoState = function(state) {
+		for (let key of Object.keys(state)) {
+			switch (key) {
+				case "meta": __setInfoStateMeta(state.meta); break;
+				case "hw": __setInfoStateHw(state.hw); break;
+				case "fan": __setInfoStateFan(state.fan); break;
+				case "system": __setInfoStateSystem(state.system); break;
+				case "extras": __setInfoStateExtras(state.extras); break;
+			}
+		}
+	};
+
+	var __setInfoStateMeta = function(state) {
 		if (state !== null) {
-			let text = JSON.stringify(state, undefined, 4).replace(/ /g, "&nbsp;").replace(/\n/g, "<br>");
+			let text = tools.escape(JSON.stringify(state, undefined, 4)).replace(/ /g, "&nbsp;").replace(/\n/g, "<br>");
 			$("about-meta").innerHTML = `
 				<span class="code-comment">// The PiKVM metadata.<br>
 				// You can get this JSON using handle <a target="_blank" href="/api/info?fields=meta">/api/info?fields=meta</a>.<br>
@@ -74,10 +86,10 @@ export function Session() {
 				${text}
 			`;
 			if (state.server && state.server.host) {
-				$("kvmd-meta-server-host").innerHTML = `Server: ${state.server.host}`;
+				$("kvmd-meta-server-host").innerText = `Server: ${state.server.host}`;
 				document.title = `PiKVM Session: ${state.server.host}`;
 			} else {
-				$("kvmd-meta-server-host").innerHTML = "";
+				$("kvmd-meta-server-host").innerText = "";
 				document.title = "PiKVM Session";
 			}
 
@@ -88,7 +100,7 @@ export function Session() {
 		}
 	};
 
-	var __setAboutInfoHw = function(state) {
+	var __setInfoStateHw = function(state) {
 		if (state.health.throttling !== null) {
 			let flags = state.health.throttling.parsed_flags;
 			let ignore_past = state.health.throttling.ignore_past;
@@ -105,7 +117,7 @@ export function Session() {
 		__renderAboutInfoHardware();
 	};
 
-	var __setAboutInfoFan = function(state) {
+	var __setInfoStateFan = function(state) {
 		let failed = false;
 		let failed_past = false;
 		if (state.monitored) {
@@ -207,11 +219,11 @@ export function Session() {
 		}
 	};
 
-	var __colored = function(color, text) {
-		return `<font color="${color}">${text}</font>`;
+	var __colored = function(color, html) {
+		return `<font color="${color}">${html}</font>`;
 	};
 
-	var __setAboutInfoSystem = function(state) {
+	var __setInfoStateSystem = function(state) {
 		$("about-version").innerHTML = `
 			KVMD: <span class="code-comment">${state.kvmd.version}</span><br>
 			<hr>
@@ -221,8 +233,8 @@ export function Session() {
 			${state.kernel.system} kernel:
 			${__formatUname(state.kernel)}
 		`;
-		$("kvmd-version-kvmd").innerHTML = state.kvmd.version;
-		$("kvmd-version-streamer").innerHTML = state.streamer.version;
+		$("kvmd-version-kvmd").innerText = state.kvmd.version;
+		$("kvmd-version-streamer").innerText = state.streamer.version;
 	};
 
 	var __formatStreamerFeatures = function(features) {
@@ -244,14 +256,14 @@ export function Session() {
 	};
 
 	var __formatUl = function(pairs) {
-		let text = "<ul>";
+		let html = "";
 		for (let pair of pairs) {
-			text += `<li>${pair[0]}: <span class="code-comment">${pair[1]}</span></li>`;
+			html += `<li>${pair[0]}: <span class="code-comment">${pair[1]}</span></li>`;
 		}
-		return text + "</ul>";
+		return `<ul>${html}</ul>`;
 	};
 
-	var __setExtras = function(state) {
+	var __setInfoStateExtras = function(state) {
 		let show_hook = null;
 		let close_hook = null;
 		let has_webterm = (state.webterm && (state.webterm.enabled || state.webterm.started));
@@ -354,11 +366,7 @@ export function Session() {
 		let data = JSON.parse(event.data);
 		switch (data.event_type) {
 			case "pong": __missed_heartbeats = 0; break;
-			case "info_meta_state": __setAboutInfoMeta(data.event); break;
-			case "info_hw_state": __setAboutInfoHw(data.event); break;
-			case "info_fan_state": __setAboutInfoFan(data.event); break;
-			case "info_system_state": __setAboutInfoSystem(data.event); break;
-			case "info_extras_state": __setExtras(data.event); break;
+			case "info_state": __setInfoState(data.event); break;
 			case "gpio_state": __gpio.setState(data.event); break;
 			case "hid_keymaps_state": __hid.setKeymaps(data.event); break;
 			case "hid_state": __hid.setState(data.event); break;