feat: initial db persistence

.env.example

@@ -0,0 +1,4 @@
+DB_URL=jdbc:postgresql://localhost:5432/homepage
+DB_MIGRATION=src/main/resources/db/migration
+DB_USERNAME=postgres
+DB_PASSWORD=postgres

build.gradle.kts

@@ -1,14 +1,42 @@
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
+import io.github.klahap.dotenv.DotEnvBuilder
+import org.flywaydb.gradle.task.FlywayMigrateTask
 import org.gradle.api.JavaVersion.VERSION_21
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_21
 import org.jetbrains.kotlin.gradle.tasks.KotlinJvmCompile
 import kotlin.io.path.Path
 
-plugins {
-    kotlin("jvm") version "2.2.20"
+val env = DotEnvBuilder.dotEnv {
+    addFile("$rootDir/.env")
+    addSystemEnv()
+}
 
-    id("gg.jte.gradle") version "3.2.1"
-    id("com.gradleup.shadow") version "9.3.0"
+val envDbUrl: String = env["DB_URL"] ?: ""
+val envDbMigration: String = env["DB_MIGRATIONS"] ?: "src/main/resources/db/migration"
+val envDbUsername: String = env["DB_USERNAME"] ?: ""
+val envDbPassword: String = env["DB_PASSWORD"] ?: ""
+
+val generatedResourcesDirectory = "${layout.buildDirectory.get()}/generated-resources"
+val generatedSourcesDirectory = "${layout.buildDirectory.get()}/generated-src"
+
+plugins {
+    alias(libs.plugins.kotlin.jvm)
+    alias(libs.plugins.shadow)
+    alias(libs.plugins.dotenv.plugin)
+    alias(libs.plugins.jte)
+    alias(libs.plugins.flyway)
+    alias(libs.plugins.jooq.codegen.gradle)
+    alias(libs.plugins.taskinfo)
+}
+
+kotlin {
+    jvmToolchain {
+        languageVersion.set(JavaLanguageVersion.of(21))
+    }
+}
+
+repositories {
+    mavenCentral()
 }
 
 buildscript {
@@ -18,32 +46,20 @@ buildscript {
     }
 
     dependencies {
+        classpath(libs.postgresql)
+        classpath(libs.flyway.database.postgresql)
     }
 }
 
-kotlin {
-    jvmToolchain {
-        languageVersion.set(JavaLanguageVersion.of(21))
-    }
-}
-
-jte {
-    sourceDirectory.set(Path("src/main/kte"))
-    targetDirectory.set(Path("${layout.buildDirectory.get()}/classes/jte"))
-
-    precompile()
-}
-
 sourceSets.main {
-    resources.srcDir("${layout.buildDirectory.get()}/classes/jte")
-}
-
-repositories {
-    mavenCentral()
+    resources.srcDir("$generatedResourcesDirectory/jte")
+    kotlin.srcDir("$generatedSourcesDirectory/jooq")
 }
 
 tasks {
     withType<KotlinJvmCompile>().configureEach {
+        dependsOn("jooqCodegen")
+
         compilerOptions {
             allWarningsAsErrors = false
             jvmTarget.set(JVM_21)
@@ -55,6 +71,14 @@ tasks {
         useJUnitPlatform()
     }
 
+    withType<FlywayMigrateTask> {
+        dependsOn("initDb")
+    }
+
+    named("precompileJte") {
+        dependsOn("compileKotlin")
+    }
+
     named<ShadowJar>("shadowJar") {
         manifest {
             attributes("Main-Class" to "at.dokkae.homepage.HomepageKt")
@@ -62,13 +86,19 @@ tasks {
 
         dependsOn("precompileJte")
 
-        from("${layout.buildDirectory.get()}/classes/jte")
+        mustRunAfter("flywayMigrate", "jooqCodegen")
+
+        from("$generatedResourcesDirectory/jte")
 
         archiveFileName.set("app.jar")
 
         exclude("META-INF/*.RSA", "META-INF/*.SF", "META-INF/*.DSA")
     }
 
+    register("buildDocker") {
+
+    }
+
     java {
         sourceCompatibility = VERSION_21
         targetCompatibility = VERSION_21
@@ -76,17 +106,101 @@ tasks {
 }
 
 dependencies {
-    implementation(platform("org.http4k:http4k-bom:6.23.1.0"))
-    implementation("org.http4k:http4k-client-okhttp")
-    implementation("org.http4k:http4k-core")
-    implementation("org.http4k:http4k-server-jetty")
-    implementation("org.http4k:http4k-template-jte")
-    implementation("org.http4k:http4k-web-htmx")
-    implementation("gg.jte:jte-kotlin:3.2.1")
-    testImplementation("org.http4k:http4k-testing-approval")
-    testImplementation("org.http4k:http4k-testing-hamkrest")
-    testImplementation("org.junit.jupiter:junit-jupiter-api:6.0.0")
-    testImplementation("org.junit.jupiter:junit-jupiter-engine:6.0.0")
-    testImplementation("org.junit.platform:junit-platform-launcher:6.0.0")
+    implementation(platform(libs.http4k.bom))
+
+    implementation(libs.dotenv)
+
+    implementation(libs.bundles.http4k)
+    implementation(libs.jte.kotlin)
+    implementation(libs.bundles.database)
+
+    testImplementation(libs.bundles.testing)
+
+    jooqCodegen(libs.jooq.meta)
+    jooqCodegen(libs.jooq.postgres)
 }
 
+// ========== JTE Templating ==========
+jte {
+    sourceDirectory.set(Path("src/main/kte"))
+    targetDirectory.set(Path("$generatedResourcesDirectory/jte"))
+    precompile()
+}
+
+// ========== FlyWay ==========
+flyway {
+    url = envDbUrl
+    user = envDbUsername
+    password = envDbPassword
+    locations = arrayOf("filesystem:$envDbMigration")
+    baselineOnMigrate = true
+    validateMigrationNaming = true
+}
+
+tasks.register("initDb") {
+    doFirst {
+        println("Database Configuration:")
+        println("  Raw URL from env: $envDbUrl")
+        println("  Resolved URL: $envDbUrl")
+        println("  Migrations: $envDbMigration")
+        println("  Credentials:")
+        println("    Username: $envDbUsername")
+        println("    Password: ${"*".repeat(envDbPassword.length)}")
+    }
+}
+
+tasks.named("flywayMigrate") {
+    finalizedBy("jooqCodegen")
+}
+
+// ========== Jooq ==========
+jooq {
+    configuration {
+        logging = org.jooq.meta.jaxb.Logging.WARN
+
+        jdbc {
+            driver = "org.postgresql.Driver"
+            url = envDbUrl
+            user = envDbUsername
+            password = envDbPassword
+        }
+
+        generator {
+            name = "org.jooq.codegen.KotlinGenerator"
+
+            database {
+                name = "org.jooq.meta.postgres.PostgresDatabase"
+                inputSchema = "public"
+
+                // SQLite specific configuration
+                includes = ".*"
+                excludes = """
+                            flyway_.*|
+                            pg_.*|
+                            information_schema.*
+                        """.trimMargin().replace("\n", "")
+            }
+
+            generate {
+                // Recommended settings for Kotlin
+                isDeprecated = false
+                isRecords = true
+                isImmutablePojos = true
+                isFluentSetters = true
+                isKotlinNotNullRecordAttributes = true
+                isKotlinNotNullPojoAttributes = true
+                isKotlinNotNullInterfaceAttributes = true
+                isPojosAsKotlinDataClasses = true
+            }
+
+            target {
+                packageName = "at.dokkae.homepage.generated.jooq"
+                directory = "$generatedSourcesDirectory/jooq"
+            }
+
+            strategy {
+                name = "org.jooq.codegen.DefaultGeneratorStrategy"
+            }
+        }
+    }
+}

gradle.properties

@@ -1,2 +1,2 @@
 org.gradle.caching=true
-org.gradle.configuration-cache=true
+org.gradle.configuration-cache=false

gradle/libs.versions.toml

@@ -0,0 +1,83 @@
+[versions]
+kotlin = "2.2.20"
+shadow = "9.3.0"
+dotenv-plugin = "1.1.3"
+dotenv = "6.5.1"
+http4k = "6.23.1.0"
+jte = "3.2.1"
+flyway = "11.19.0"
+jooq = "3.20.10"
+junit = "6.0.0"
+postgresql = "42.7.7"
+taskinfo = "3.0.0"
+
+[plugins]
+kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
+shadow = { id = "com.gradleup.shadow", version.ref = "shadow" }
+dotenv-plugin = { id = "io.github.klahap.dotenv", version.ref = "dotenv-plugin" }
+jte = { id = "gg.jte.gradle", version.ref = "jte" }
+flyway = { id = "org.flywaydb.flyway", version.ref = "flyway" }
+jooq-codegen-gradle = { id = "org.jooq.jooq-codegen-gradle", version.ref = "jooq" }
+taskinfo = { id = "org.barfuin.gradle.taskinfo", version.ref = "taskinfo" }
+
+[bundles]
+http4k = [
+    "http4k-client-okhttp",
+    "http4k-core",
+    "http4k-server-jetty",
+    "http4k-template-jte",
+    "http4k-web-htmx"
+]
+
+testing = [
+    "http4k-testing-approval",
+    "http4k-testing-hamkrest",
+    "junit-jupiter-api",
+    "junit-jupiter-engine",
+    "junit-platform-launcher"
+]
+
+database = [
+    "flyway-core",
+    "jooq",
+    "jooq-meta",
+    "jooq-codegen",
+    "jooq-postgres"
+]
+
+[libraries]
+# Environment Management
+dotenv = { module = "io.github.cdimascio:dotenv-kotlin", version.ref = "dotenv" }
+
+# HTTP4K Platform (BOM)
+http4k-bom = { module = "org.http4k:http4k-bom", version.ref = "http4k" }
+
+# HTTP4K Dependencies
+http4k-client-okhttp = { module = "org.http4k:http4k-client-okhttp" }
+http4k-core = { module = "org.http4k:http4k-core" }
+http4k-server-jetty = { module = "org.http4k:http4k-server-jetty" }
+http4k-template-jte = { module = "org.http4k:http4k-template-jte" }
+http4k-web-htmx = { module = "org.http4k:http4k-web-htmx" }
+
+# JTE Templating
+jte-kotlin = { module = "gg.jte:jte-kotlin", version.ref = "jte" }
+
+# Database Driver
+postgresql = { module = "org.postgresql:postgresql", version.ref = "postgresql" }
+
+# Flyway
+flyway-core = { module = "org.flywaydb:flyway-core", version.ref = "flyway" }
+flyway-database-postgresql = { module = "org.flywaydb:flyway-database-postgresql", version.ref = "flyway"}
+
+# Jooq
+jooq = { module = "org.jooq:jooq", version.ref = "jooq" }
+jooq-meta = { module = "org.jooq:jooq-meta", version.ref = "jooq" }
+jooq-codegen = { module = "org.jooq:jooq-codegen", version.ref = "jooq" }
+jooq-postgres = { module = "org.jooq:jooq-postgres-extensions", version.ref = "jooq" }
+
+# Testing
+http4k-testing-approval = { module = "org.http4k:http4k-testing-approval" }
+http4k-testing-hamkrest = { module = "org.http4k:http4k-testing-hamkrest" }
+junit-jupiter-api = { module = "org.junit.jupiter:junit-jupiter-api", version.ref = "junit" }
+junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junit" }
+junit-platform-launcher = { module = "org.junit.platform:junit-platform-launcher", version.ref = "junit" }

src/main/kotlin/at/dokkae/homepage/Homepage.kt

@@ -1,7 +1,10 @@
 package at.dokkae.homepage
 
 import at.dokkae.homepage.extensions.Precompiled
+import at.dokkae.homepage.repository.MessageRepository
+import at.dokkae.homepage.repository.impls.JooqMessageRepository
 import at.dokkae.homepage.templates.Index
+import io.github.cdimascio.dotenv.dotenv
 import org.http4k.core.HttpHandler
 import org.http4k.core.Method.*
 import org.http4k.core.Response
@@ -22,6 +25,9 @@ import org.http4k.sse.SseResponse
 import org.http4k.template.JTETemplates
 import org.http4k.template.ViewModel
 import org.jetbrains.kotlin.backend.common.push
+import org.jooq.SQLDialect
+import org.jooq.impl.DSL
+import java.sql.DriverManager
 import java.time.Instant
 import java.util.UUID
 import java.util.concurrent.CopyOnWriteArrayList
@@ -30,22 +36,32 @@ import kotlin.concurrent.thread
 data class Message(
     val author: String,
     val content: String,
-    val createdAt: Instant = Instant.now(),
+
     val id: UUID = UUID.randomUUID(),
+    val createdAt: Instant = Instant.now(),
+    val updatedAt: Instant? = null
 ) : ViewModel {
+    init {
+        require(author.length <= 31) { "Author must be 31 characters or less" }
+        require(content.length <= 255) { "Content must be 255 characters or less" }
+    }
+
+
     override fun template(): String = "partials/Message"
 }
 
 fun main() {
-    val messages = CopyOnWriteArrayList<Message>()
-    val subscribers = CopyOnWriteArrayList<Sse>()
-    val renderer = JTETemplates().Precompiled("build/classes/jte")
+    val env = dotenv()
 
-    messages.push(Message("Kurisu", "Hello World!"))
-    messages.push(Message("Violet", "Haii Kurisu!"))
+    val connection = DriverManager.getConnection(env["DB_URL"], env["DB_USERNAME"], env["DB_PASSWORD"])
+    val dslContext = DSL.using(connection, SQLDialect.POSTGRES)
+    val messageRepository: MessageRepository = JooqMessageRepository(dslContext)
+
+    val subscribers = CopyOnWriteArrayList<Sse>()
+    val renderer = JTETemplates().Precompiled("build/generated-resources/jte")
 
     val indexHandler: HttpHandler = {
-        Response(Status.OK).body(renderer(Index(messages)))
+        Response(Status.OK).body(renderer(Index(messageRepository.findAll())))
     }
 
     val sse = sse(
@@ -72,12 +88,12 @@ fun main() {
                 val msg = Message(author, message)
                 val sseMsg = SseMessage.Data(renderer(msg))
 
-                messages.push(msg)
+                messageRepository.save(msg)
                 subscribers.forEach {
                     thread { it.send(sseMsg) }
                 }
 
-                Response(Status.OK)
+                Response(Status.CREATED)
             }
         }
     )

src/main/kotlin/at/dokkae/homepage/repository/MessageRepository.kt

@@ -0,0 +1,8 @@
+package at.dokkae.homepage.repository
+
+import at.dokkae.homepage.Message
+
+interface MessageRepository {
+    fun save(message: Message): Message
+    fun findAll(): List<Message>
+}

src/main/kotlin/at/dokkae/homepage/repository/impls/JooqMessageRepository.kt

@@ -0,0 +1,40 @@
+package at.dokkae.homepage.repository.impls
+
+import at.dokkae.homepage.Message
+import at.dokkae.homepage.generated.jooq.tables.records.MessageRecord
+import at.dokkae.homepage.generated.jooq.tables.references.MESSAGE
+import at.dokkae.homepage.repository.MessageRepository
+import org.jooq.DSLContext
+import org.jooq.impl.DSL
+
+class JooqMessageRepository(
+    private val dslContext: DSLContext
+) : MessageRepository {
+    override fun save(message: Message): Message = dslContext.transactionResult { config ->
+        val ctx = DSL.using(config)
+
+        ctx.insertInto(MESSAGE)
+            .set(MESSAGE.ID, message.id)
+            .set(MESSAGE.AUTHOR, message.author)
+            .set(MESSAGE.CONTENT, message.content)
+            .onDuplicateKeyUpdate()
+            .set(MESSAGE.AUTHOR, message.author)
+            .set(MESSAGE.CONTENT, message.content)
+            .returning()
+            .fetchOne()!!
+            .toMessage()
+    }
+
+    override fun findAll(): List<Message> = dslContext.selectFrom(MESSAGE)
+        .orderBy(MESSAGE.CREATED_AT.desc())
+        .fetch { it.toMessage() }
+
+
+    private fun MessageRecord.toMessage(): Message = Message(
+        id = this.id,
+        author = this.author,
+        content = this.content,
+        createdAt = this.createdAt!!.toInstant(),
+        updatedAt = this.updatedAt?.toInstant(),
+    )
+}

src/main/resources/db/migration/V001__add_update_and_create_timestamp_triggers.sql

@@ -0,0 +1,18 @@
+create or replace function handle_timestamps()
+    returns trigger as
+$$
+begin
+    if lower(tg_op) = 'insert' then
+        new.created_at = coalesce(new.created_at, current_timestamp);
+        new.updated_at = coalesce(new.updated_at, current_timestamp);
+    elsif lower(tg_op) = 'update' then
+        if new.created_at is distinct from old.created_at then
+            raise exception 'Direct modification of created_at is not allowed.';
+        end if;
+
+        new.updated_at = current_timestamp;
+    end if;
+
+    return new;
+end;
+$$ language plpgsql;

src/main/resources/db/migration/V002__add_message_table.sql

@@ -0,0 +1,13 @@
+create table message (
+    id uuid not null primary key,
+    author varchar(31) not null,
+    content varchar(255) not null,
+
+    created_at timestamptz not null default current_timestamp,
+    updated_at timestamptz
+);
+
+create trigger handle_message_timestamps
+    before insert or update on message
+    for each row
+    execute function handle_timestamps();