fix: устойчивое скачивание из Jellyfin — OkHttp + retry вместо HttpURLConnection

Прод-инцидент (3 джоба failed подряд): HttpURLConnection рвал скачивание
7.2 ГБ на ~5-й минуте ('Can't download video from Jellyfin'), при этом curl
с той же машины качал стабильно (HTTP/1.1 и HTTP/2). Сеть и Jellyfin чисты.

- JellyfinInput: OkHttpClient (readTimeout=0, followRedirects), byteStream→Files.copy,
  retry до 3 попыток с паузой 5с на IOException, warn-лог каждой попытки
- InputService: лог с полным stacktrace (реальная причина обрыва теперь видна)

build.gradle.kts

@@ -50,6 +50,7 @@ dependencies {
     implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.11.0")
     implementation(platform("software.amazon.awssdk:bom:2.46.21"))
     implementation("software.amazon.awssdk:s3")
+    implementation("com.squareup.okhttp3:okhttp:4.12.0")
 
     testImplementation("org.springframework.boot:spring-boot-starter-test")
     testImplementation(kotlin("test-junit5"))

src/main/kotlin/pw/binom/mirror/worker/convert/InputService.kt

@@ -28,6 +28,7 @@ class InputService(
             logger.info("Download cancelled: {}", source)
             throw e
         } catch (e: Throwable) {
+            logger.warn("Download failed: {}", e.message, e)
             throw IllegalStateException("Can't download video from $source", e)
         }
         logger.info("Downloaded success in {} ms", (System.nanoTime() - startTime) / 1_000_000)

src/main/kotlin/pw/binom/mirror/worker/convert/JellyfinInput.kt

@@ -1,15 +1,18 @@
 package pw.binom.mirror.worker.convert
 
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.withContext
+import okhttp3.OkHttpClient
+import okhttp3.Request
 import org.slf4j.Logger
 import org.slf4j.LoggerFactory
 import org.springframework.stereotype.Component
-import java.net.HttpURLConnection
-import java.net.URL
+import java.io.IOException
 import java.nio.file.Files
 import java.nio.file.Path
 import java.nio.file.StandardCopyOption
+import java.util.concurrent.TimeUnit
 
 @Component
 class JellyfinInput(
@@ -17,24 +20,46 @@ class JellyfinInput(
 ) : InputService.InputImplementation {
     private val logger: Logger = LoggerFactory.getLogger(JellyfinInput::class.java)
 
+    private val client: OkHttpClient by lazy {
+        OkHttpClient.Builder()
+            .connectTimeout(30, TimeUnit.SECONDS)
+            .readTimeout(0, TimeUnit.SECONDS)
+            .followRedirects(true)
+            .followSslRedirects(true)
+            .build()
+    }
+
     override fun isSupport(source: InputSource): Boolean = source is InputSource.Jellyfin
 
     override suspend fun download(source: InputSource): Path = withContext(Dispatchers.IO) {
         source as InputSource.Jellyfin
-        val url = URL(source.streamUrl)
-        val connection = url.openConnection() as HttpURLConnection
-        connection.requestMethod = "GET"
-        connection.instanceFollowRedirects = true
-        connection.connectTimeout = 30_000
-        connection.readTimeout = 120_000
-        try {
-            if (connection.responseCode != HttpURLConnection.HTTP_OK) {
-                throw IllegalStateException("Invalid response code ${connection.responseCode}")
+        var lastError: IOException? = null
+        for (attempt in 1..3) {
+            try {
+                return@withContext downloadOnce(source)
+            } catch (e: IOException) {
+                lastError = e
+                logger.warn("Download attempt {}/3 failed: {}", attempt, e.message)
+                if (attempt < 3) {
+                    delay(5_000)
+                }
+            }
+        }
+        throw lastError!!
+    }
+
+    private fun downloadOnce(source: InputSource.Jellyfin): Path {
+        val request = Request.Builder().url(source.streamUrl).get().build()
+        val response = client.newCall(request).execute()
+        response.use {
+            if (!response.isSuccessful) {
+                throw IllegalStateException("Invalid response code ${response.code}")
             }
             val resultFile = localStorageService.genFile()
-            logger.info("Downloading file in to ${resultFile}...")
-            try {
-                connection.inputStream.use { input ->
+            logger.info("Downloading file in to {}...", resultFile)
+            val path = try {
+                val body = response.body ?: throw IllegalStateException("Empty response body")
+                body.byteStream().use { input ->
                     Files.copy(input, resultFile, StandardCopyOption.REPLACE_EXISTING)
                 }
                 logger.info("File success downloaded!")
@@ -43,8 +68,7 @@ class JellyfinInput(
                 runCatching { Files.deleteIfExists(resultFile) }
                 throw e
             }
-        } finally {
-            connection.disconnect()
+            return path
         }
     }
 }