Add basic graphql implementation with manga and chapters loading with data loaders

server/src/main/kotlin/suwayomi/tachidesk/graphql/queries/MangaQuery.kt

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+package suwayomi.tachidesk.graphql.queries
+
+import com.expediagroup.graphql.server.extensions.getValueFromDataLoader
+import graphql.schema.DataFetchingEnvironment
+import org.jetbrains.exposed.sql.andWhere
+import org.jetbrains.exposed.sql.select
+import org.jetbrains.exposed.sql.selectAll
+import org.jetbrains.exposed.sql.transactions.transaction
+import suwayomi.tachidesk.graphql.types.MangaType
+import suwayomi.tachidesk.manga.model.table.CategoryMangaTable
+import suwayomi.tachidesk.manga.model.table.MangaTable
+import java.util.concurrent.CompletableFuture
+
+class MangaQuery {
+    fun manga(dataFetchingEnvironment: DataFetchingEnvironment, id: Int): CompletableFuture<MangaType> {
+        return dataFetchingEnvironment.getValueFromDataLoader<Int, MangaType>("MangaDataLoader", id)
+    }
+
+    data class MangaQueryInput(
+        val ids: List<Int>? = null,
+        val categoryIds: List<Int>? = null,
+        val page: Int? = null,
+        val count: Int? = null
+    )
+
+    fun mangas(input: MangaQueryInput? = null): List<MangaType> {
+        val results = transaction {
+            var res = MangaTable.selectAll()
+
+            if (input != null) {
+                if (input.categoryIds != null) {
+                    res = MangaTable.innerJoin(CategoryMangaTable)
+                        .select { CategoryMangaTable.category inList input.categoryIds }
+                }
+                if (input.ids != null) {
+                    res.andWhere { MangaTable.id inList input.ids }
+                }
+                if (input.count != null) {
+                    val offset = if (input.page == null) 0 else (input.page * input.count).toLong()
+                    res.limit(input.count, offset)
+                }
+            }
+
+            res.toList()
+        }
+
+        return results.map { MangaType(it) }
+    }
+}