010ed17884
Dynamic linking on WebAssembly involves preloading .so libraries during startup of application. Normally, those plugin preload lists are generating manually by user, which can be tedious. Add a bash script which demonstrates how to call python programs to generate preload lists. Pick-to: 6.9 Change-Id: I0a9869ad0d26606f8b33af2c38248cec3088dd0d Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
99 lines
3.5 KiB
Python
Executable File
99 lines
3.5 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (C) 2023 The Qt Company Ltd.
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# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
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import os
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import sys
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import subprocess
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import json
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# Paths to shared libraries and qml imports on the Qt installation on the web server.
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# "$QTDIR" is replaced by qtloader.js at load time (defaults to "qt"), and makes
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# possible to relocate the application build relative to the Qt build on the web server.
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qt_lib_path = "$QTDIR/lib"
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qt_qml_path = "$QTDIR/qml"
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# Path to QML imports on the in-memory file system provided by Emscripten. This script emits
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# preload commands which copies QML imports to this directory. In addition, preload_qt_plugins.py
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# creates (and preloads) a qt.conf file which makes Qt load QML plugins from this location.
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qt_deploy_qml_path = "/qt/qml"
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def preload_file(source, destination):
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preload_files.append({"source": source, "destination": destination})
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def extract_preload_files_from_imports(imports):
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libraries = []
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for qml_import in imports:
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try:
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relative_path = qml_import["relativePath"]
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plugin = qml_import["plugin"]
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# plugin .so
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plugin_filename = "lib" + plugin + ".so"
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so_plugin_source_path = os.path.join(
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qt_qml_path, relative_path, plugin_filename
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)
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so_plugin_destination_path = os.path.join(
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qt_deploy_qml_path, relative_path, plugin_filename
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)
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preload_file(so_plugin_source_path, so_plugin_destination_path)
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so_plugin_qt_install_path = os.path.join(
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qt_wasm_path, "qml", relative_path, plugin_filename
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)
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# qmldir file
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qmldir_source_path = os.path.join(qt_qml_path, relative_path, "qmldir")
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qmldir_destination_path = os.path.join(
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qt_deploy_qml_path, relative_path, "qmldir"
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)
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preload_file(qmldir_source_path, qmldir_destination_path)
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except Exception as e:
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continue
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return libraries
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if __name__ == "__main__":
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if len(sys.argv) != 5:
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print("Usage: python preload_qml_imports.py <qml-source-path> <qt-host-path> <qt-wasm-path> <output-dir>")
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sys.exit(1)
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qml_source_path = sys.argv[1]
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qt_host_path = sys.argv[2]
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qt_wasm_path = sys.argv[3]
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output_dir = sys.argv[4]
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qml_import_path = os.path.join(qt_wasm_path, "qml")
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qmlimportsscanner_path = os.path.join(qt_host_path, "libexec/qmlimportscanner")
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command = [qmlimportsscanner_path, "-rootPath", qml_source_path, "-importPath", qml_import_path]
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result = subprocess.run(command, stdout=subprocess.PIPE)
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imports = json.loads(result.stdout)
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preload_files = []
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libraries = extract_preload_files_from_imports(imports)
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# Deploy plugin dependencies, that is, shared libraries used by the plugins.
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# Skip some of the obvious libraries which will be
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skip_libraries = [
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"libQt6Core.so",
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"libQt6Gui.so",
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"libQt6Quick.so",
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"libQt6Qml.so" "libQt6Network.so",
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"libQt6OpenGL.so",
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]
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libraries = set(libraries) - set(skip_libraries)
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for library in libraries:
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source = os.path.join(qt_lib_path, library)
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# Emscripten looks for shared libraries on "/", shared libraries
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# most be deployed there instead of at /qt/lib
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destination = os.path.join("/", library)
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preload_file(source, destination)
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with open(f"{output_dir}/qt_qml_imports.json", "w") as f:
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f.write(json.dumps(preload_files, indent=2))
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