Mercurial > libervia-web
annotate libervia/server/tasks/manager.py @ 1347:48e2a8b07c0b
browser: async version of bridge
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Sat, 05 Sep 2020 21:59:11 +0200 |
| parents | a46d0e0f383b |
| children | df40708c4c76 |
| rev | line source |
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| 1239 | 1 #!/usr/bin/env python3 |
| 2 | |
| 1146 | 3 # Libervia: a Salut à Toi frontend |
| 1237 | 4 # Copyright (C) 2011-2020 Jérôme Poisson <goffi@goffi.org> |
| 1146 | 5 |
| 6 # This program is free software: you can redistribute it and/or modify | |
| 7 # it under the terms of the GNU Affero General Public License as published by | |
| 8 # the Free Software Foundation, either version 3 of the License, or | |
| 9 # (at your option) any later version. | |
| 10 | |
| 11 # This program is distributed in the hope that it will be useful, | |
| 12 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 # GNU Affero General Public License for more details. | |
| 15 | |
| 16 # You should have received a copy of the GNU Affero General Public License | |
| 17 # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 18 import os | |
| 19 import os.path | |
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20 from pathlib import Path |
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21 from typing import Dict |
| 1245 | 22 import importlib.util |
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23 from twisted.internet import defer |
| 1245 | 24 from sat.core.log import getLogger |
| 1146 | 25 from sat.core import exceptions |
| 26 from sat.core.i18n import _ | |
| 1245 | 27 from sat.tools import utils |
| 1146 | 28 from libervia.server.constants import Const as C |
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29 from . import implicit |
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30 from .task import Task |
| 1146 | 31 |
| 32 log = getLogger(__name__) | |
| 33 | |
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34 DEFAULT_SITE_LABEL = _("default site") |
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35 |
| 1146 | 36 |
| 1245 | 37 class TasksManager: |
| 1146 | 38 """Handle tasks of a Libervia site""" |
| 39 | |
| 40 def __init__(self, host, site_resource): | |
| 41 """ | |
| 42 @param site_resource(LiberviaRootResource): root resource of the site to manage | |
| 43 """ | |
| 44 self.host = host | |
| 45 self.resource = site_resource | |
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46 self.tasks_dir = self.site_path / C.TASKS_DIR |
| 1245 | 47 self.tasks = {} |
| 1146 | 48 self._build_path = None |
| 49 self._current_task = None | |
| 50 | |
| 51 @property | |
| 52 def site_path(self): | |
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53 return Path(self.resource.site_path) |
| 1146 | 54 |
| 55 @property | |
| 56 def build_path(self): | |
| 57 """path where generated files will be build for this site""" | |
| 58 if self._build_path is None: | |
| 59 self._build_path = self.host.getBuildPath(self.site_name) | |
| 60 return self._build_path | |
| 61 | |
| 62 @property | |
| 63 def site_name(self): | |
| 64 return self.resource.site_name | |
| 65 | |
| 1245 | 66 def validateData(self, task): |
| 67 """Check workflow attributes in task""" | |
| 1146 | 68 |
| 1245 | 69 for var, allowed in (("ON_ERROR", ("continue", "stop")), |
| 70 ("LOG_OUTPUT", bool), | |
| 71 ("WATCH_DIRS", list)): | |
| 72 value = getattr(task, var) | |
| 1146 | 73 |
| 74 if isinstance(allowed, type): | |
| 1245 | 75 if allowed is list and value is None: |
| 76 continue | |
| 1146 | 77 if not isinstance(value, allowed): |
| 78 raise ValueError( | |
| 1216 | 79 _("Unexpected value for {var}, {allowed} is expected.") |
| 1245 | 80 .format(var=var, allowed=allowed)) |
| 1146 | 81 else: |
| 82 if not value in allowed: | |
| 1245 | 83 raise ValueError(_("Unexpected value for {var}: {value!r}").format( |
| 84 var=var, value=value)) | |
| 1146 | 85 |
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86 async def importTask( |
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87 self, |
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88 task_name: str, |
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89 task_path: Path, |
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90 to_import: Dict[str, Path] |
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91 ) -> None: |
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92 if task_name in self.tasks: |
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93 log.debug(f"skipping task {task_name} which is already imported") |
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94 return |
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95 module_name = f"{self.site_name or C.SITE_NAME_DEFAULT}.task.{task_name}" |
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96 |
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97 spec = importlib.util.spec_from_file_location(module_name, task_path) |
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98 task_module = importlib.util.module_from_spec(spec) |
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99 spec.loader.exec_module(task_module) |
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100 task = task_module.Task(self, task_name) |
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101 if task.AFTER is not None: |
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102 for pre_task_name in task.AFTER: |
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103 log.debug( |
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104 f"task {task_name!r} must be run after {pre_task_name!r}") |
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105 try: |
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106 pre_task_path = to_import[pre_task_name] |
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107 except KeyError: |
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108 raise ValueError( |
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109 f"task {task_name!r} must be run after {pre_task_name!r}, " |
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110 f"however there is no task with such name") |
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111 await self.importTask(pre_task_name, pre_task_path, to_import) |
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112 |
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113 # we launch prepare, which is a method used to prepare |
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114 # data at runtime (e.g. set WATCH_DIRS using config) |
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115 try: |
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116 prepare = task.prepare |
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117 except AttributeError: |
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118 pass |
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119 else: |
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120 log.info(_('== preparing task "{task_name}" for {site_name} =='.format( |
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121 task_name=task_name, site_name=self.site_name or DEFAULT_SITE_LABEL))) |
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122 try: |
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123 await utils.asDeferred(prepare) |
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124 except exceptions.CancelError as e: |
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125 log.debug(f"Skipping {task_name} which cancelled itself: {e}") |
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126 return |
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127 |
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128 self.tasks[task_name] = task |
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129 self.validateData(task) |
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130 if self.host.options['dev_mode']: |
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131 dirs = task.WATCH_DIRS or [] |
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132 for dir_ in dirs: |
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133 self.host.files_watcher.watchDir( |
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134 dir_, auto_add=True, recursive=True, |
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135 callback=self._autorunTask, task_name=task_name) |
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136 |
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137 async def parseTasksDir(self, dir_path: Path) -> None: |
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138 log.debug(f"parsing tasks in {dir_path}") |
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139 tasks_paths = sorted(dir_path.glob('task_*.py')) |
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140 to_import = {} |
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141 for task_path in tasks_paths: |
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142 if not task_path.is_file(): |
| 1146 | 143 continue |
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144 task_name = task_path.stem[5:].lower().strip() |
| 1146 | 145 if not task_name: |
| 146 continue | |
| 147 if task_name in self.tasks: | |
| 148 raise exceptions.ConflictError( | |
| 1216 | 149 "A task with the name [{name}] already exists".format( |
| 1146 | 150 name=task_name)) |
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151 log.debug(f"task {task_name} found") |
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152 to_import[task_name] = task_path |
| 1245 | 153 |
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154 for task_name, task_path in to_import.items(): |
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155 await self.importTask(task_name, task_path, to_import) |
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156 |
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157 async def parseTasks(self): |
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158 # implicit tasks are always run |
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159 implicit_path = Path(implicit.__file__).parent |
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160 await self.parseTasksDir(implicit_path) |
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161 # now we check if there are tasks specific to this site |
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162 if not self.tasks_dir.is_dir(): |
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163 log.debug(_("{name} has no task to launch.").format( |
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164 name = self.resource.site_name or DEFAULT_SITE_LABEL)) |
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165 return |
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166 else: |
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167 await self.parseTasksDir(self.tasks_dir) |
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168 |
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169 def _autorunTask(self, host, filepath, flags, task_name): |
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170 """Called when an event is received from a watched directory""" |
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171 if flags == ['create']: |
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172 return |
| 1260 | 173 try: |
| 174 task = self.tasks[task_name] | |
| 175 on_dir_event_cb = task.onDirEvent | |
| 176 except AttributeError: | |
| 177 return defer.ensureDeferred(self.runTask(task_name)) | |
| 178 else: | |
| 179 return utils.asDeferred( | |
| 180 on_dir_event_cb, host, Path(filepath.path.decode()), flags) | |
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181 |
| 1260 | 182 async def runTaskInstance(self, task: Task) -> None: |
| 183 self._current_task = task.name | |
| 1216 | 184 log.info(_('== running task "{task_name}" for {site_name} =='.format( |
| 1260 | 185 task_name=task.name, site_name=self.site_name or DEFAULT_SITE_LABEL))) |
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186 os.chdir(self.site_path) |
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187 try: |
| 1245 | 188 await utils.asDeferred(task.start) |
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189 except Exception as e: |
| 1245 | 190 on_error = task.ON_ERROR |
| 1216 | 191 if on_error == 'stop': |
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192 raise e |
| 1216 | 193 elif on_error == 'continue': |
| 194 log.warning(_('Task "{task_name}" failed for {site_name}: {reason}') | |
| 1260 | 195 .format(task_name=task.name, site_name=self.site_name, reason=e)) |
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196 else: |
| 1216 | 197 raise exceptions.InternalError("we should never reach this point") |
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198 self._current_task = None |
| 1146 | 199 |
| 1260 | 200 async def runTask(self, task_name: str) -> None: |
| 201 """Run a single task | |
| 202 | |
| 203 @param task_name(unicode): name of the task to run | |
| 204 """ | |
| 205 task = self.tasks[task_name] | |
| 206 await self.runTaskInstance(task) | |
| 207 | |
| 1245 | 208 async def runTasks(self): |
| 1146 | 209 """Run all the tasks found""" |
| 210 old_path = os.getcwd() | |
| 1216 | 211 for task_name, task_value in self.tasks.items(): |
| 1245 | 212 await self.runTask(task_name) |
| 1146 | 213 os.chdir(old_path) |