Daniel Walker's questions

我有一个 React 应用，我正尝试通过 FastAPI 静态提供该应用。我的文件夹中有我所有的 React 构建工件static。因此，我的 FastAPI 应用如下所示：

static/
    assets/
        index-lATvXaZG.js
    index.html
app.py

在app.py中，我有：

app = FastAPI()
app.mount("/static", StaticFiles(directory="static"), name="react")

@app.get("")
@app.get("/")
@app.get("/index.html")
def serve_index():
    return FileResponse("static/index.html")

但是，当index.html加载时，客户端理所当然地会对 发出 GET 请求/assets/index-lATvXaZG.js。当然，FastAPI 找不到它。

我可以在我的 React 应用程序中（或者，在我的 FastAPI 设置中）进行设置以使路径对齐吗？

我有以下形式的 FastAPI 设置：

class Foo(sqlmodel.SQLModel, table=True):
    id: typing.Optional[int] = sqlmodel.Field(primary_key=True)
    data: str

    @pydantic.field_validator("data", mode="before")
    def serialize_dict(cls, value):
        if isinstance(value, dict):
            return json.dumps(value)
        return value


@app.post("/foos")
def create_foo(foo: Foo, session: sqlmodel.Session = fastapi.Depends(get_session)):
    session.add(foo)
    session.commit()
    return fastapi.Response()

然后我发布

{
    "data": {
        "bar": 5
    }
}

到/foos。但是，这会引发 SQL 异常，因为data无法绑定值。在输入一些日志语句后，我发现foo.data是dict而不是str。此外，我确认我的验证器从未被调用过。

由于SQLModel继承自pydantic.BaseModel，我本以为我可以使用这样的验证器。我遗漏了什么？

这是带有 pydantic 2.10.6 的 sqlmodel 0.0.23。

我有一些用 ARC 编译的 Objective C 代码：

void func(void) {
    NSString *string;

    // Do some stuff.  Maybe return early.

    string = @"initialized";

    // Other stuff.
}

ARC 如何处理未初始化的对象指针？我假设它像 C 指针一样，string最初包含堆栈垃圾。如果是这样，那么如果我要在初始化变量之前返回，ARC 如何知道如何处理它？

我是否需要将其初始化为，nil以避免内存泄漏？

如果引用的是调度对象或块而不是，这有关系吗NSObject？

我在 Ubuntu 20.04 上运行 docker-compose 1.25.0。我的配置文件看起来像

version: "3"

services:
  foo:
    image: some_image
    init: true
    ...

当我跑步时docker-compose up，我得到

The compose file './docker-compose.yaml' is invalid because:
Unsupported config option for services.foo: 'init'

根据文档，该init选项是在 2.2 版本文件格式中添加的。据此， Compose 版本 1.13.0+ 支持该文件格式。

我刚刚开始 Android 应用程序开发，在实现OnClickListener. 我从 Android Studio 中的“空视图活动”开始。我在其他 UI 元素中添加了 a Button、 anEditText和ScrollView包含 a 的 a TextView。我OnClickListener在按钮上设置了一个，以便发出 logcat 消息。

当我单击该按钮时，它会按预期发出 logcat 消息。但是，一旦我单击文本字段，该按钮就会在应用程序的剩余生命周期内变得无响应。奇怪的是，如果我删除ScrollView.

这是我的 MRE：

活动主文件

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/startErrorText"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/startButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="160dp"
        android:layout_marginTop="30dp"
        android:layout_marginEnd="160dp"
        android:text="Start"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textField" />

    <EditText
        android:id="@+id/textField"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="80dp"
        android:layout_marginTop="48dp"
        android:layout_marginEnd="80dp"
        android:ems="10"
        android:hint="Enter some text"
        android:inputType="text"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ScrollView
        android:id="@+id/scrollView"
        android:layout_width="409dp"
        android:layout_height="585dp"
        android:layout_marginStart="1dp"
        android:layout_marginTop="20dp"
        android:layout_marginEnd="1dp"
        android:layout_marginBottom="2dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/startButton"
        app:layout_constraintVertical_bias="1.0">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <TextView
                android:id="@+id/logView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
        </LinearLayout>
    </ScrollView>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

package com.example.test

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.view.View
import android.view.View.OnClickListener
import android.widget.Button

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val button: Button = findViewById(R.id.startButton)
        button.setOnClickListener(object : OnClickListener {
            override fun onClick(v: View?) {
                Log.i("MyApp", "Button pressed")
            }
        })
    }
}

这是 logcat 输出：

ziparchive              com.example.test                     W  Unable to open '/data/data/com.example.test/code_cache/.overlay/base.apk/classes3.dm': No such file or directory
ziparchive              com.example.test                     W  Unable to open '/data/app/~~6ohH-jaL6kb5-3S5sLz1rw==/com.example.test-21xtpoSa2I8lnFAMirvZRA==/base.dm': No such file or directory
ziparchive              com.example.test                     W  Unable to open '/data/app/~~6ohH-jaL6kb5-3S5sLz1rw==/com.example.test-21xtpoSa2I8lnFAMirvZRA==/base.dm': No such file or directory
nativeloader            com.example.test                     D  Configuring clns-6 for other apk /data/app/~~6ohH-jaL6kb5-3S5sLz1rw==/com.example.test-21xtpoSa2I8lnFAMirvZRA==/base.apk. target_sdk_version=34, uses_libraries=, library_path=/data/app/~~6ohH-jaL6kb5-3S5sLz1rw==/com.example.test-21xtpoSa2I8lnFAMirvZRA==/lib/arm64, permitted_path=/data:/mnt/expand:/data/user/0/com.example.test
GraphicsEnvironment     com.example.test                     V  Currently set values for:
GraphicsEnvironment     com.example.test                     V    angle_gl_driver_selection_pkgs=[]
GraphicsEnvironment     com.example.test                     V    angle_gl_driver_selection_values=[]
GraphicsEnvironment     com.example.test                     V  ANGLE GameManagerService for com.example.test: false
GraphicsEnvironment     com.example.test                     V  com.example.test is not listed in per-application setting
GraphicsEnvironment     com.example.test                     V  Neither updatable production driver nor prerelease driver is supported.
libEGL                  com.example.test                     D  loaded /vendor/lib64/egl/libEGL_emulation.so
AppCompatDelegate       com.example.test                     D  Checking for metadata for AppLocalesMetadataHolderService : Service not found
libEGL                  com.example.test                     D  loaded /vendor/lib64/egl/libGLESv1_CM_emulation.so
libEGL                  com.example.test                     D  loaded /vendor/lib64/egl/libGLESv2_emulation.so
om.example.test         com.example.test                     W  Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (unsupported, reflection, allowed)
om.example.test         com.example.test                     W  Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (unsupported, reflection, allowed)
Compatibil...geReporter com.example.test                     D  Compat change id reported: 210923482; UID 10191; state: ENABLED
Compatibil...geReporter com.example.test                     D  Compat change id reported: 171228096; UID 10191; state: ENABLED
Compatibil...geReporter com.example.test                     D  Compat change id reported: 237531167; UID 10191; state: DISABLED
OpenGLRenderer          com.example.test                     W  Unknown dataspace 0
OpenGLRenderer          com.example.test                     W  Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
OpenGLRenderer          com.example.test                     W  Failed to initialize 101010-2 format, error = EGL_SUCCESS
Gralloc4                com.example.test                     I  mapper 4.x is not supported
OpenGLRenderer          com.example.test                     E  Unable to match the desired swap behavior.
AutofillManager         com.example.test                     D  notifyViewEnteredForFillDialog:1073741824
EGL_emulation           com.example.test                     D  app_time_stats: avg=145.48ms min=0.87ms max=1433.47ms count=10
EGL_emulation           com.example.test                     D  app_time_stats: avg=181.58ms min=13.65ms max=2822.69ms count=17
MyApp                   com.example.test                     I  Button pressed
ProfileInstaller        com.example.test                     D  Installing profile for com.example.test
EGL_emulation           com.example.test                     D  app_time_stats: avg=39.13ms min=0.77ms max=1255.29ms count=48
Compatibil...geReporter com.example.test                     D  Compat change id reported: 163400105; UID 10191; state: ENABLED
ImeTracker              com.example.test                     I  com.example.test:39ecb7d6: onRequestShow at ORIGIN_CLIENT_SHOW_SOFT_INPUT reason SHOW_SOFT_INPUT
InputMethodManager      com.example.test                     D  showSoftInput() view=androidx.appcompat.widget.AppCompatEditText{4a6450d VFED..CL. .F.P..ID 250,132-830,256 #7f0801f9 app:id/textField aid=1073741824} flags=0 reason=SHOW_SOFT_INPUT
AssistStructure         com.example.test                     I  Flattened final assist data: 1492 bytes, containing 1 windows, 8 views
InsetsController        com.example.test                     D  show(ime(), fromIme=true)
InteractionJankMonitor  com.example.test                     D  Build configuration failed!
                                                                                                    java.lang.IllegalArgumentException: Must pass in a valid surface control if only instrument surface; 
                                                                                                        at com.android.internal.jank.InteractionJankMonitor$Configuration.validate(InteractionJankMonitor.java:1259)
                                                                                                        at com.android.internal.jank.InteractionJankMonitor$Configuration.<init>(InteractionJankMonitor.java:1217)
                                                                                                        at com.android.internal.jank.InteractionJankMonitor$Configuration.<init>(Unknown Source:0)
                                                                                                        at com.android.internal.jank.InteractionJankMonitor$Configuration$Builder.build(InteractionJankMonitor.java:1197)
                                                                                                        at com.android.internal.jank.InteractionJankMonitor.begin(InteractionJankMonitor.java:611)
                                                                                                        at android.view.inputmethod.ImeTracker$ImeJankTracker.onRequestAnimation(ImeTracker.java:717)
                                                                                                        at android.view.InsetsController$InternalAnimationControlListener$2.onAnimationStart(InsetsController.java:448)
                                                                                                        at android.animation.Animator$AnimatorListener.onAnimationStart(Animator.java:695)
                                                                                                        at android.animation.Animator$AnimatorCaller$$ExternalSyntheticLambda0.call(Unknown Source:4)
                                                                                                        at android.animation.Animator.callOnList(Animator.java:669)
                                                                                                        at android.animation.Animator.notifyListeners(Animator.java:608)
                                                                                                        at android.animation.Animator.notifyStartListeners(Animator.java:625)
                                                                                                        at android.animation.ValueAnimator.startAnimation(ValueAnimator.java:1334)
                                                                                                        at android.animation.ValueAnimator.start(ValueAnimator.java:1149)
                                                                                                        at android.animation.ValueAnimator.start(ValueAnimator.java:1173)
                                                                                                        at android.view.InsetsController$InternalAnimationControlListener.onReady(InsetsController.java:470)
                                                                                                        at android.view.InsetsAnimationThreadControlRunner.lambda$new$0(InsetsAnimationThreadControlRunner.java:129)
                                                                                                        at android.view.InsetsAnimationThreadControlRunner.$r8$lambda$3zGKYd3XPzPnvMO2hiF8a88M6T0(Unknown Source:0)
                                                                                                        at android.view.InsetsAnimationThreadControlRunner$$ExternalSyntheticLambda2.run(Unknown Source:6)
                                                                                                        at android.os.Handler.handleCallback(Handler.java:958)
                                                                                                        at android.os.Handler.dispatchMessage(Handler.java:99)
                                                                                                        at android.os.Looper.loopOnce(Looper.java:205)
                                                                                                        at android.os.Looper.loop(Looper.java:294)
                                                                                                        at android.os.HandlerThread.run(HandlerThread.java:67)
ImeTracker              com.example.test                     I  com.example.test:39ecb7d6: onShown
EGL_emulation           com.example.test                     D  app_time_stats: avg=213.12ms min=0.85ms max=500.33ms count=5
EGL_emulation           com.example.test                     D  app_time_stats: avg=500.68ms min=499.36ms max=502.83ms count=3

这种情况java.lang.IllegalArgumentException只是偶尔发生，但总体错误每次都会发生。

我创建了一对函数：

void destroy_foo(void *ptr);
void *create_foo(void);

顾名思义，这些功能类似于malloc和free。我想使用malloc gcc 函数属性来通知编译器这种关系，以便此代码会发出警告-fanalyzer：

void *ptr = create_foo();
destroy_foo(ptr);
destroy_foo(ptr);

按照上述链接中的示例，我做了

void *create_foo(void) __attribute__ ((malloc (destroy_foo)));

虽然 gcc (11.4.0) 对此没问题，但 clang (14.0.0) 抱怨

error: 'malloc' attribute takes no arguments
void *create_foo(void) __attribute__ ((malloc (destroy_foo)));
                                       ^

我的理解是 gcc 属性与 clang 配合得很好。