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annotate libervia/frontends/tools/aio.py @ 4194:3dbaf179c50d

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core (launcher): new `wait_for_service` option: if `wait_for_service` is used in `[DEFAULT]`, the service at the specified host/port is waited for before starting the backend. This is useful in the situation where we need to be sure that something is started before running, e.g. in a container.
author Goffi <goffi@goffi.org>
date Wed, 13 Dec 2023 22:00:25 +0100
parents 5de6f3595380
children d01b8d002619
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python3
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2
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3 # Libervia AsyncIO helper methods
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4 # Copyright (C) 2009-2023 Jérôme Poisson (goffi@goffi.org)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 import asyncio
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20 from typing import Any, Awaitable, Callable, Coroutine
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21
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22 from libervia.backend.core import log as logging
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23
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24 log = logging.getLogger(__name__)
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25 background_tasks = set()
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27
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28 def _on_task_done(task: asyncio.Future) -> None:
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29 """Callback function to execute when a task is done.
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30
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31 @param task: The completed task.
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32 Note: The function removes the task from the tracking set and logs any exceptions
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33 that might have occurred.
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34 """
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35 background_tasks.discard(task)
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36 e = task.exception()
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37 if e is not None:
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38 exc_info = (type(e), e, e.__traceback__)
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39 log.error("Task failed:", exc_info=exc_info)
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40
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41
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42 def run_async(async_method: Coroutine | asyncio.Future) -> None:
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43 """Schedules and tracks an asynchronous method.
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44
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45 @param async_method: The method to be scheduled for execution.
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46 Note: The function keeps a strong reference to the task to prevent it from being
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47 garbage-collected. In case of task failure, logs the error.
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48 cf. https://docs.python.org/3/library/asyncio-task.html#asyncio.create_task
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49 """
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50 if isinstance(async_method, asyncio.Future):
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51 task = asyncio.ensure_future(async_method)
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52 else:
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53 task = asyncio.create_task(async_method)
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54
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55 background_tasks.add(task)
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56 task.add_done_callback(_on_task_done)
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57
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58
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59 def run_with_args(
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60 async_method: Callable[..., Coroutine[Any, Any, Any]], *args: Any, **kwargs: Any
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61 ) -> None:
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62 """Schedules and tracks an asynchronous method with arguments.
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63
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64 This function wraps the provided asynchronous method with its arguments
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65 and then schedules it for execution.
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66
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67 @param async_method: The asynchronous method to be scheduled.
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68 @param args: Positional arguments to pass to the async_method.
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69 @param kwargs: Keyword arguments to pass to the async_method.
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70 """
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71 run_async(async_method(*args, **kwargs))
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72
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73
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74 def run_from_thread(
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75 async_method: Coroutine | asyncio.Future,
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76 *args,
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77 loop: asyncio.AbstractEventLoop | None = None,
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78 **kwargs,
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79 ) -> None:
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80 """Schedules an asynchronous method from another thread.
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81
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82 @param async_method: The method to be scheduled for execution.
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83 """
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84 if loop is None:
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85 loop = asyncio.get_event_loop()
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86 assert loop is not None
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87 loop.call_soon_threadsafe(run_with_args, async_method, *args, **kwargs)
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88
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89
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90 def maybe_async(result: Any | Awaitable[Any]) -> Awaitable[Any]:
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91 """
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92 Convert the provided result into an awaitable.
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93
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94 @param result: the result of a function or coroutine call
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95 @return: an awaitable object which can be awaited to get the result
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96 """
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97 if asyncio.iscoroutine(result):
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98 return result
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99
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100 future = asyncio.Future()
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101 future.set_result(result)
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102 return future
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103
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104
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105 def install_glib_asyncio_iteration():
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106 """Import and install GLib context iteration inside our asyncio event loop.
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107
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108 This is used as soon as GLib is used (like GStreamer).
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109 Inspired from Kivy's install_gobject_iteration (in ``kivy.support``), thanks to Kivy's
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110 team.
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111 """
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112
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113 import asyncio
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114
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115 try:
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116 from gi.repository import GLib
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117 except ImportError:
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118 raise ImportError("GLib could not be imported. Ensure it's installed.")
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119
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120 if hasattr(GLib, "_glib_already_installed"):
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121 # already installed, don't do it twice.
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122 return
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123
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124 GLib._glib_already_installed = True
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125
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126 loop = asyncio.get_event_loop()
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127
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128 # Create a GLib MainContext and make it the default
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129 glib_context = GLib.MainContext.default()
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130
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131 # Function to iterate over the GLib main context
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132 def _glib_iteration():
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133 # We need to loop over the context to prevent lag
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134 iteration_count = 0
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135 while glib_context.pending() and iteration_count < 20:
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136 glib_context.iteration(False)
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137 iteration_count += 1
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138
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139 # If no work was done in the GLib loop, add a short delay before
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140 # scheduling the next iteration, to prevent spinning and high CPU usage.
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141 if iteration_count == 0:
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142 loop.call_later(0.01, _glib_iteration)
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143 else:
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144 # Schedule ourselves to run again on the next asyncio loop iteration
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145 loop.call_soon(_glib_iteration)
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146
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147 # Kick off the GLib iteration
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148 loop.call_soon(_glib_iteration)