flet build improvements (#2404)

* `flet build -vv` should run `pip install` with verbose output

Close #2351

* `flet build` should raise an error when trying to package an app with native modules for iOS or Android

Close #2356

* Generate app asset hash for more effective unpacking

Close #2289

* Fix "OSError: [WinError 193] %1 is not a valid Win32 application" error on Windows

Fix #2318

* Flet version bumped to 0.19.0

* Replace --windows-tcp-port with a random port

Author: FeodorFitsner

CHANGELOG.md

@@ -1,5 +1,26 @@
 # Flet changelog
 
+# 0.19.0
+
+* `flet build` to apply Python SSL fix when packaging for iOS and Android ([#2349](https://github.com/flet-dev/flet/issues/2349)).
+* Upgrade Android Gradle in flet `build app` template ([#2350](https://github.com/flet-dev/flet/issues/2350)).
+* `flet build -vv` should run pip install with verbose output ([#2351](https://github.com/flet-dev/flet/issues/2351)).
+* Add Python output/logging to troubleshoot empty screens on startup of built app ([#2352](https://github.com/flet-dev/flet/issues/2352)).
+* `flet build` should raise an error when trying to package an app with native modules for iOS or Android ([#2356](https://github.com/flet-dev/flet/issues/2356)).
+* `flet build` to add timestamp (hash) asset with Flet Python app to re-extract when code changes ([#2289](https://github.com/flet-dev/flet/issues/2289)).
+* Handle/bypass `if __name__ == "__main__"` check on Android.
+* Support reading dependencies from `pyproject.toml`.
+* `flet build` to fix `--base-url` with surrounding slashes ([#2369](https://github.com/flet-dev/flet/issues/2369)).
+* `CupertinoAlertDialog`, `CupertinoDialogAction`, adaptive property for `AlertDialog` ([#2365](https://github.com/flet-dev/flet/issues/2365)).
+* `Dismissible.confirmDismiss` prop ([#2359](https://github.com/flet-dev/flet/issues/2359)).
+* `ListView.reverse` and `GridView.reverse` props ([#2335](https://github.com/flet-dev/flet/issues/2335)).
+* `Text.style` type Deprecation warning ([#2286](https://github.com/flet-dev/flet/issues/2286)).
+* Add `LineChartData.prevent_curve_over_shooting` and `LineChartData.prevent_curve_over_shooting_threshold` props ([#2354](https://github.com/flet-dev/flet/issues/2354)).
+* `flet build` to add checks to allow certain build commands according to "build_on" platform ([#2343](https://github.com/flet-dev/flet/issues/2343)).
+* Fixed: `flet build` gives "OSError: [WinError 193] %1 is not a valid Win32 application" for some users ([#2318](https://github.com/flet-dev/flet/issues/2318)).
+* Fixed: PubSub is not shared between pages in the same FastAPI app ([#2368](https://github.com/flet-dev/flet/issues/2368)).
+* Fixed: check for `DISPLAY` instead of `XDG_CURRENT_DESKTOP` to check if linux machine is GUIless or not ([#2373](https://github.com/flet-dev/flet/issues/2373)).
+
 # 0.18.0
 
 * `flet build` command to package Flet app for any platform ([docs](https://flet.dev/docs/guides/python/packaging-app-for-distribution)).

client/pubspec.lock

@@ -183,7 +183,7 @@ packages:
       path: "../package"
       relative: true
     source: path
-    version: "0.18.0"
+    version: "0.19.0"
   flutter:
     dependency: "direct main"
     description: flutter

package/CHANGELOG.md

@@ -1,3 +1,24 @@
+# 0.19.0
+
+* `flet build` to apply Python SSL fix when packaging for iOS and Android ([#2349](https://github.com/flet-dev/flet/issues/2349)).
+* Upgrade Android Gradle in flet `build app` template ([#2350](https://github.com/flet-dev/flet/issues/2350)).
+* `flet build -vv` should run pip install with verbose output ([#2351](https://github.com/flet-dev/flet/issues/2351)).
+* Add Python output/logging to troubleshoot empty screens on startup of built app ([#2352](https://github.com/flet-dev/flet/issues/2352)).
+* `flet build` should raise an error when trying to package an app with native modules for iOS or Android ([#2356](https://github.com/flet-dev/flet/issues/2356)).
+* `flet build` to add timestamp (hash) asset with Flet Python app to re-extract when code changes ([#2289](https://github.com/flet-dev/flet/issues/2289)).
+* Handle/bypass `if __name__ == "__main__"` check on Android.
+* Support reading dependencies from `pyproject.toml`.
+* `flet build` to fix `--base-url` with surrounding slashes ([#2369](https://github.com/flet-dev/flet/issues/2369)).
+* `CupertinoAlertDialog`, `CupertinoDialogAction`, adaptive property for `AlertDialog` ([#2365](https://github.com/flet-dev/flet/issues/2365)).
+* `Dismissible.confirmDismiss` prop ([#2359](https://github.com/flet-dev/flet/issues/2359)).
+* `ListView.reverse` and `GridView.reverse` props ([#2335](https://github.com/flet-dev/flet/issues/2335)).
+* `Text.style` type Deprecation warning ([#2286](https://github.com/flet-dev/flet/issues/2286)).
+* Add `LineChartData.prevent_curve_over_shooting` and `LineChartData.prevent_curve_over_shooting_threshold` props ([#2354](https://github.com/flet-dev/flet/issues/2354)).
+* `flet build` to add checks to allow certain build commands according to "build_on" platform ([#2343](https://github.com/flet-dev/flet/issues/2343)).
+* Fixed: `flet build` gives "OSError: [WinError 193] %1 is not a valid Win32 application" for some users ([#2318](https://github.com/flet-dev/flet/issues/2318)).
+* Fixed: PubSub is not shared between pages in the same FastAPI app ([#2368](https://github.com/flet-dev/flet/issues/2368)).
+* Fixed: check for `DISPLAY` instead of `XDG_CURRENT_DESKTOP` to check if linux machine is GUIless or not ([#2373](https://github.com/flet-dev/flet/issues/2373)).
+
 # 0.18.0
 
 * `flet build` command to package Flet app for any platform ([docs](https://flet.dev/docs/guides/python/packaging-app-for-distribution)).

package/pubspec.yaml

@@ -2,7 +2,7 @@ name: flet
 description: Write entire Flutter app in Python or add server-driven UI experience into existing Flutter app.
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/flet
-version: 0.18.0
+version: 0.19.0
 
 # This package supports all platforms listed below.
 platforms:

sdk/python/packages/flet-runtime/src/flet_runtime/utils.py

@@ -1,3 +1,4 @@
+import hashlib
 import json
 import os
 import re
@@ -168,6 +169,17 @@ def get_current_script_dir():
     return os.path.abspath(pathname)
 
 
+def calculate_file_hash(path, blocksize=65536):
+    h = hashlib.sha256()
+    with open(path, "rb") as f:
+        while True:
+            data = f.read(blocksize)
+            if not data:
+                break
+            h.update(data)
+    return h.hexdigest()
+
+
 def patch_index_html(
     index_path: str,
     base_href: str,

sdk/python/packages/flet/src/flet/cli/commands/build.py

@@ -13,7 +13,7 @@
 import yaml
 from flet.cli.commands.base import BaseCommand
 from flet_core.utils import random_string, slugify
-from flet_runtime.utils import copy_tree, is_windows
+from flet_runtime.utils import calculate_file_hash, copy_tree, is_windows
 from rich import print
 
 if is_windows():
@@ -207,13 +207,6 @@ def add_arguments(self, parser: argparse.ArgumentParser) -> None:
             default="path",
             help="URL routing strategy (web only)",
         )
-        parser.add_argument(
-            "--windows-tcp-port",
-            dest="windows_tcp_port",
-            type=int,
-            default=63777,
-            help="TCP port for Windows app",
-        )
         parser.add_argument(
             "--flutter-build-args",
             dest="flutter_build_args",
@@ -261,17 +254,9 @@ def add_arguments(self, parser: argparse.ArgumentParser) -> None:
     def handle(self, options: argparse.Namespace) -> None:
         from cookiecutter.main import cookiecutter
 
-        # check if `flutter` executable is available in the path
-        flutter_exe = shutil.which("flutter")
-        if not flutter_exe:
-            print("`flutter` command is not available in PATH. Install Flutter SDK.")
-            sys.exit(1)
-
-        # check if `dart` executable is available in the path
-        dart_exe = shutil.which("dart")
-        if not dart_exe:
-            print("`dart` command is not available in PATH. Install Flutter SDK.")
-            sys.exit(1)
+        # get `flutter` and `dart` executables from PATH
+        flutter_exe = self.find_flutter_batch("flutter")
+        dart_exe = self.find_flutter_batch("dart")
 
         target_platform = options.target_platform.lower()
         # platform check
@@ -351,7 +336,6 @@ def handle(self, options: argparse.Namespace) -> None:
         template_data["use_color_emoji"] = (
             "true" if options.use_color_emoji else "false"
         )
-        template_data["windows_tcp_port"] = options.windows_tcp_port
 
         # create Flutter project from a template
         print("Creating Flutter bootstrap project...", end="")
@@ -590,6 +574,8 @@ def fallback_image(yaml_path: str, images: list):
                 package_args.extend(
                     [
                         "--mobile",
+                        "--platform",
+                        "mobile",
                     ]
                 )
             package_args.extend(
@@ -603,6 +589,9 @@ def fallback_image(yaml_path: str, images: list):
                 ]
             )
 
+        if self.verbose > 1:
+            package_args.append("--verbose")
+
         package_result = self.run(package_args, cwd=str(self.flutter_dir))
 
         if package_result.returncode != 0:
@@ -611,6 +600,17 @@ def fallback_image(yaml_path: str, images: list):
             if package_result.stderr:
                 print(package_result.stderr)
             self.cleanup(package_result.returncode)
+
+        # make sure app/app.zip exists
+        app_zip_path = self.flutter_dir.joinpath("app", "app.zip")
+        if not os.path.exists(app_zip_path):
+            print("Flet app package app/app.zip was not created.")
+            self.cleanup(1)
+
+        # create {flutter_dir}/app/app.hash
+        app_hash_path = self.flutter_dir.joinpath("app", "app.zip.hash")
+        with open(app_hash_path, "w") as hf:
+            hf.write(calculate_file_hash(app_zip_path))
         print("[spring_green3]OK[/spring_green3]")
 
         # run `flutter build`
@@ -710,6 +710,17 @@ def copy_icon_image(self, src_path: Path, dest_path: Path, image_name: str):
             return Path(images[0]).name
         return None
 
+    def find_flutter_batch(self, exe_filename: str):
+        batch_path = shutil.which(exe_filename)
+        if not batch_path:
+            print(
+                f"`{exe_filename}` command is not available in PATH. Install Flutter SDK."
+            )
+            sys.exit(1)
+        if is_windows() and batch_path.endswith(".file"):
+            return batch_path.replace(".file", ".bat")
+        return batch_path
+
     def run(self, args, cwd):
         if is_windows():
             # Source: https://stackoverflow.com/a/77374899/1435891