FileCacheStrategy, ReusableInput fundamental

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/Mirai.kt

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai
+
+import io.ktor.utils.io.ByteReadChannel
+import kotlinx.io.core.Input
+import net.mamoe.mirai.utils.ExternalImage
+import net.mamoe.mirai.utils.MiraiExperimentalAPI
+import net.mamoe.mirai.utils.SinceMirai
+import net.mamoe.mirai.utils.internal.InputStream
+import kotlin.jvm.JvmStatic
+
+/**
+ * Mirai 全局环境.
+ */
+@SinceMirai("1.0.0")
+expect object Mirai {
+
+    @JvmStatic
+    var fileCacheStrategy: FileCacheStrategy
+
+    /**
+     * 缓存策略.
+     *
+     * 图片上传时默认使用文件缓存.
+     */
+    interface FileCacheStrategy {
+        @MiraiExperimentalAPI
+        fun newImageCache(input: Input): ExternalImage
+
+        @MiraiExperimentalAPI
+        fun newImageCache(input: ByteReadChannel): ExternalImage
+
+        @MiraiExperimentalAPI
+        fun newImageCache(input: InputStream): ExternalImage
+
+        companion object Default : FileCacheStrategy
+    }
+}

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/ExternalImage.kt

@@ -24,6 +24,7 @@ import net.mamoe.mirai.message.data.Image
 import net.mamoe.mirai.message.data.OfflineImage
 import net.mamoe.mirai.message.data.sendTo
 import net.mamoe.mirai.message.data.toLongUnsigned
+import net.mamoe.mirai.utils.internal.asReusableInput
 import kotlin.jvm.JvmSynthetic
 
 /**
@@ -34,33 +35,43 @@ import kotlin.jvm.JvmSynthetic
  * @see ExternalImage.sendTo 上传图片并以纯图片消息发送给联系人
  * @See ExternalImage.upload 上传图片并得到 [Image] 消息
  */
-class ExternalImage private constructor(
+@OptIn(MiraiInternalAPI::class)
+class ExternalImage internal constructor(
     val md5: ByteArray,
-    val input: Any, // Input from kotlinx.io, InputStream from kotlinx.io MPP, ByteReadChannel from ktor
-    val inputSize: Long // dont be greater than Int.MAX
+    @Suppress("EXPOSED_PROPERTY_TYPE_IN_CONSTRUCTOR")
+    @MiraiInternalAPI("unstable API")
+    val input: ReusableInput, // Input from kotlinx.io, InputStream from kotlinx.io MPP, ByteReadChannel from ktor
+    @MiraiInternalAPI("unstable API")
+    val inputSize: Int // dont be greater than Int.MAX
 ) {
+    @SinceMirai("1.0.0")
+    internal interface ReusableInput {
+        fun input(): Input
+    }
+
+
     constructor(
         md5: ByteArray,
         input: ByteReadChannel,
         inputSize: Long // dont be greater than Int.MAX
-    ) : this(md5, input as Any, inputSize)
+    ) : this(md5, input.asReusableInput(), inputSize.coerceAtMost(Int.MAX_VALUE.toLongUnsigned()).toInt())
 
     constructor(
         md5: ByteArray,
         input: Input,
         inputSize: Long // dont be greater than Int.MAX
-    ) : this(md5, input as Any, inputSize)
+    ) : this(md5, input.asReusableInput(), inputSize.coerceAtMost(Int.MAX_VALUE.toLongUnsigned()).toInt())
 
     constructor(
         md5: ByteArray,
         input: ByteReadPacket
-    ) : this(md5, input as Any, input.remaining)
+    ) : this(md5, input.asReusableInput(), input.remaining.coerceAtMost(Int.MAX_VALUE.toLongUnsigned()).toInt())
 
     @OptIn(InternalSerializationApi::class)
     constructor(
         md5: ByteArray,
         input: InputStream
-    ) : this(md5, input as Any, input.available().toLongUnsigned())
+    ) : this(md5, input.asReusableInput(), input.available())
 
     init {
         require(inputSize < 30L * 1024 * 1024) { "file is too big. Maximum is about 20MB" }

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/utils/internal/asReusableInput.common.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.utils.internal
+
+import kotlinx.coroutines.io.ByteReadChannel
+import kotlinx.io.InputStream
+import kotlinx.io.core.Input
+import kotlinx.serialization.InternalSerializationApi
+import net.mamoe.mirai.utils.ExternalImage
+
+
+internal expect fun ByteReadChannel.asReusableInput(): ExternalImage.ReusableInput
+internal expect fun Input.asReusableInput(): ExternalImage.ReusableInput
+
+@OptIn(InternalSerializationApi::class)
+internal expect fun InputStream.asReusableInput(): ExternalImage.ReusableInput

mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/Mirai.kt

@@ -0,0 +1,15 @@
+package net.mamoe.mirai
+
+/**
+ * Mirai 全局环境.
+ */
+actual object Mirai {
+    actual var fileCacheStrategy: FileCacheStrategy
+        get() = TODO("Not yet implemented")
+        set(value) {}
+
+    actual interface FileCacheStrategy {
+
+    }
+
+}

mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/utils/internal/asReusableInput.jvm.kt

@@ -0,0 +1,18 @@
+package net.mamoe.mirai.utils.internal
+
+import kotlinx.coroutines.io.ByteReadChannel
+import kotlinx.io.core.Input
+import net.mamoe.mirai.utils.ExternalImage
+import java.io.InputStream
+
+internal actual fun ByteReadChannel.asReusableInput(): ExternalImage.ReusableInput {
+    TODO("Not yet implemented")
+}
+
+internal actual fun Input.asReusableInput(): ExternalImage.ReusableInput {
+    TODO("Not yet implemented")
+}
+
+internal actual fun InputStream.asReusableInput(): ExternalImage.ReusableInput {
+    TODO("Not yet implemented")
+}