设置Netty (或Spark)以静态形式提供kotlin-js模块的输出

Question

我尝试使用Kotlin创建一个全栈项目。由于多平台项目在Kotlin中是实验性的，因此没有太多可用信息，因此我尝试从IDEA项目向导的项目框架开始(Kotlin > JS Client和JVM Server)。它生成基本代码，甚至添加"hello world“类型的示例代码。

但是，当我构建项目并启动它(gradle run)时，网页控制台告诉我kotlin-js包不可用：

The script from “http://127.0.0.1:8080/static/piggy-bank.js” was loaded even though its MIME type (“”) is not a valid JavaScript MIME type.
Loading failed for the <script> with source “http://127.0.0.1:8080/static/piggy-bank.js”. [127.0.0.1:8080:8:1](http://127.0.0.1:8080/)

该示例使用Netty作为嵌入式web服务器，预生成的代码为：

embeddedServer(Netty, port = 8091, host = "127.0.0.1") {
    routing {
        get("/") {
            call.respondHtml {
                head {
                    title("Hello from Ktor!")
                }
                body {
                    +"${hello()} from Ktor. Check me value: ${Sample().checkMe()}"
                    div {
                        id = "js-response"
                        +"Loading..."
                    }
                    script(src = "/static/piggy-bank.js") {}
                }
            }
        }
        static("/static") {
            resource("piggy-bank.js")
        }
    }
}.start(wait = true)

它在static文件夹中查找已编译的js代码，但是gradle任务不会创建，也不会将生成的文件复制到静态文件夹中。

通过一些重构，我成功地实现了这个示例。首先，我找到了所需的代码，并在build/js/packages/piggy-bank/kotlin中找到了它，因此我更改了静态配置：

val buildDir = System.getProperty("user.dir")+"/build"
val jsDir = "$buildDir/js/packages/piggy-bank/kotlin"
val jsImpDir = "$buildDir/js/packages_imported/kotlin/1.3.50"

embeddedServer(Netty, port = 8090, host = "127.0.0.1") {
    routing {
        get("/") {
            call.respondHtml {
                head {
                    title("Hello from Ktor!")
                }
                body {
                    +"${hello()} from Ktor. Check me value: ${Sample().checkMe()}"
                    div {
                        id = "js-response"
                        +"Loading..."
                    }
                    // Note, that I had to add Kotlin system js file manually!
                    script(src = "/static/kotlin.js") {}
                    script(src = "/static/piggy-bank.js") {}
                }
            }
        }
        static("static") {
            // Here comes the new references
            files( "$jsDir")
            files( "$jsImpDir")
        }
    }
}.start(wait = true)

这暂时解决了问题，但只在IDEA中有效(直接引用build文件夹)。正确的解决方案应该是gradle构建脚本创建一个自包含的、完全可操作的代码。

下面是我的(也是生成的) gradle文件(我已经从Groovy迁移到Kotlin DSL)：

import org.jetbrains.kotlin.gradle.targets.js.webpack.KotlinWebpack

buildscript {
    repositories {
        jcenter()
    }
}

plugins {
    id("org.jetbrains.kotlin.multiplatform") version "1.3.50"
}

repositories {
    jcenter()
    maven(  "https://dl.bintray.com/kotlin/ktor" )
    mavenCentral()
}

val ktor_version = "1.1.3"
val logback_version = "1.2.3"

kotlin {
    js {
        browser {  }
    }
    jvm {
        compilations.named("main") {
            tasks.getByName<Copy>(processResourcesTaskName) {
                dependsOn("jsBrowserWebpack")
                 tasks.named<KotlinWebpack>("jsBrowserWebpack") {
                     println(this.outputs)
                     from(entry.name, destinationDirectory)
                 }
            }
        }
    }

    sourceSets {
        commonMain {
                        dependencies {
                implementation(kotlin("stdlib-common"))
            }
        }
        commonTest {
            dependencies {
                implementation(kotlin("test-common"))
                implementation(kotlin("test-annotations-common"))
            }
        }

        named("jvmMain") {
            dependencies {
                implementation( kotlin("stdlib-jdk8"))
                implementation( "io.ktor:ktor-server-netty:$ktor_version")
                implementation( "io.ktor:ktor-html-builder:$ktor_version")
                implementation( "ch.qos.logback:logback-classic:$logback_version")
            }
        }

        named("jvmTest") {
            dependencies {
                implementation(kotlin("test"))
                implementation(kotlin("test-testng"))
            }
        }

        named("jsMain") {
            dependencies {
                implementation( kotlin("stdlib-js"))
            }
        }
        named("jsTest") {
            dependencies {
                implementation( kotlin("test-js"))
            }
        }


    }
}


tasks.register<JavaExec>("run") {
    dependsOn("jvmJar")
    group = "application"
    main = "sample.SampleJvmKt"
    val t = tasks.named<Jar>("jvmJar")

    classpath(configurations.named("jvmRuntimeClasspath"), t.get() )
}

我应该如何更改构建文件以构建正确的代码？

Answer 1

我用"org.jetbrains.kotlin.multiplatform" 1.3.50重现了这个问题，但用1.3.61重现失败。你能把它和你的项目核对一下吗？