Mercurial > libervia-web

annotate libervia/web/server/tasks/implicit/task_js_modules.py @ 1570:038d4bfdd967

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server (tasks/JS modules): add new way to generate modules + support of CSS files
author Goffi <goffi@goffi.org>
date Wed, 22 Nov 2023 16:31:32 +0100
parents eb00d593801d
children d07838fc9d99
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/ur/bin/env python3
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2
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3 import json
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4 from pathlib import Path
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5 from libervia.backend.core.i18n import _
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6 from libervia.backend.core.log import getLogger
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7 from libervia.backend.core import exceptions
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8 from libervia.web.server.constants import Const as C
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9 from libervia.web.server.tasks import task
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10
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11
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12 log = getLogger(__name__)
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13
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14
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15 class Task(task.Task):
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16
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17 async def prepare(self):
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18 if "js" not in self.resource.browser_modules:
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19 raise exceptions.CancelError("No JS module needed")
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20
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21 async def start(self):
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22 js_data = self.resource.browser_modules['js']
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23 package = js_data.get('package', {})
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24 package_path = self.build_path / 'package.json'
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25 with package_path.open('w') as f:
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26 json.dump(package, f)
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27
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28 cmd = self.find_command('yarnpkg', 'yarn')
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29 await self.runCommand(cmd, 'install', path=str(self.build_path))
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30
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31 try:
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32 brython_map = js_data['brython_map']
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33 except KeyError:
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34 pass
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35 else:
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36 log.info(_("creating JS modules mapping for Brython"))
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37 js_modules_path = self.build_path / 'js_modules'
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38 js_modules_path.mkdir(exist_ok=True)
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39 init_path = js_modules_path / '__init__.py'
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40 init_path.touch()
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41
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42 for module_name, module_data in brython_map.items():
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43 log.debug(f"generating mapping for {module_name}")
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44 if ' ' in module_name:
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45 raise ValueError(
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46 f"module {module_name!r} has space(s), it must not!")
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47 module_python_name = module_name.replace(".", "_").replace("-", "_")
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48 if module_python_name != module_name:
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49 log.info("{module_python_name!r} will be used as python module name")
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50 module_path = js_modules_path / f"{module_python_name}.py"
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51 if isinstance(module_data, str):
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52 module_data = {'path': [module_data]}
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53 try:
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54 js_paths = module_data.pop('path')
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55 except KeyError:
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56 raise ValueError(
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57 f'module data for {module_name} must have a "path" key')
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58 if isinstance(js_paths, str):
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59 js_paths = [js_paths]
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60 module_data['path'] = [
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61 Path('node_modules') / js_path.strip(' /') for js_path in js_paths
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62 ]
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63 to_export = module_data.get("export", [module_name])
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64 if isinstance(to_export, str):
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65 to_export = to_export.split(",")
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66 to_export = [e.strip() for e in to_export]
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67
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68 init_code = []
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69
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70 # CSS if any
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71 css_to_load = module_data.get("css")
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72 if css_to_load:
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73 if isinstance(css_to_load, str):
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74 css_to_load = [css_to_load]
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75
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76 add_styles_lines = []
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77 for css_path in css_to_load:
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78 normalized_css_path = Path("node_modules") / css_path.strip(" /")
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79 css_href = Path("/").joinpath(C.BUILD_DIR, normalized_css_path)
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80 style_tag = (
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81 f'<link rel="stylesheet" type="text/css" href="{css_href}">'
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82 )
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83 add_style_code = (
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84 'document.head.insertAdjacentHTML('
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85 '"beforeend", '
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86 f"'{style_tag}')"
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87 )
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88 add_styles_lines.append(add_style_code)
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89
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90 add_styles = "\n".join(add_styles_lines)
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91 else:
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92 add_styles = ""
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93
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94 with module_path.open('w') as f:
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95 browser_imports = ["aio", "document"]
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96 modules_import = []
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97 script_paths = [
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98 str(Path('/').joinpath(C.BUILD_DIR, path))
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99 for path in module_data["path"]
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100 ]
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101 import_type = module_data.get('import_type', "load")
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102 if import_type == 'module':
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103 modules_import.append('javascript')
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104 modules_import.append('proxy')
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105 callback_function_name = f"on_{module_python_name}_loaded"
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106 declare_obj = "\n".join(f"{e} = proxy.JSProxy()" for e in to_export)
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107 export_str = "\n ".join(f"{e}.js_module=module.{e}" for e in to_export)
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108 load_js_libraries = (
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109 f"\n{declare_obj}\n\n"
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110 f"def {callback_function_name}(module):\n"
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111 f" {export_str}\n"
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112 f" loaded.set_result(True)\n\n"
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113 f"javascript.import_modules({script_paths}, {callback_function_name})\n"
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114 )
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115 elif import_type == 'script':
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116 browser_imports.append("window")
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117 script_tags = [
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118 f"<script src='{src}'></script>" for src in script_paths
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119 ]
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120 load_js_libraries = "\n".join(
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121 f'document.head.insertAdjacentHTML("beforeend", "{tag}")'
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122 for tag in script_tags
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123 )
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124 init_code.append('\n'.join(f'{e} = window.{e}' for e in to_export))
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125 init_code.append("loaded.set_result(True)")
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126 elif import_type == "load":
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127 browser_imports.append("load")
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128 browser_imports.append("window")
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129 load_calls = [f'load("{src}")' for src in script_paths]
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130 load_js_libraries = "\n".join(load_calls)
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131 init_code.append('\n'.join(f'{e} = window.{e}' for e in to_export))
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132 init_code.append("loaded.set_result(True)")
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133 else:
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134 raise ValueError("Invalid import type: {import_type!r}")
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135
1570
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136 extra_init = module_data.get("extra_init")
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137 if extra_init is not None:
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138 if not isinstance(extra_init, str):
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139 raise ValueError(f"Invalid extra_init: {extra_init!r}")
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140 init_code.append(
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141 extra_init.format(
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142 build_dir = C.BUILD_DIR
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143 )
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144 )
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145
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146 init_code_str = "\n".join(init_code)
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147 imports = [f"from browser import {', '.join(browser_imports)}"]
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148 for module in modules_import:
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149 imports.append(f"import {module}")
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150 imports_str = "\n".join(imports)
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151
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152 f.write(
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153 "#!/usr/bin/env python3\n"
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154 f"{imports_str}\n\n"
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155 f"loaded = aio.Future()\n"
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156 f"{add_styles}\n"
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157 f"{load_js_libraries}\n"
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158 f"{init_code_str}"
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159 )