Put all user settings persistence code in its own module.

src/persistence/HuntMethodPersister.ts

@@ -0,0 +1,38 @@
+import { Persister } from "./Persister";
+import { Server, HuntMethod } from "../domain";
+
+class HuntMethodPersister extends Persister {
+    persist_method_user_times(hunt_methods: HuntMethod[], server: Server): void {
+        const user_times: PersistedUserTimes = {};
+
+        for (const method of hunt_methods) {
+            if (method.user_time != undefined) {
+                user_times[method.id] = method.user_time;
+            }
+        }
+
+        this.persist_for_server(server, "HuntMethodStore.methodUserTimes", user_times);
+    }
+
+    async load_method_user_times(
+        hunt_methods: HuntMethod[],
+        server: Server
+    ): Promise<HuntMethod[]> {
+        const user_times = await this.load_for_server<PersistedUserTimes>(
+            server,
+            "HuntMethodStore.methodUserTimes"
+        );
+
+        if (user_times) {
+            for (const method of hunt_methods) {
+                method.user_time = user_times[method.id];
+            }
+        }
+
+        return hunt_methods;
+    }
+}
+
+type PersistedUserTimes = { [method_id: string]: number };
+
+export const hunt_method_persister = new HuntMethodPersister();

src/persistence/HuntOptimizerPersister.ts

@@ -0,0 +1,52 @@
+import { Server } from "../domain";
+import { WantedItem } from "../stores/HuntOptimizerStore";
+import { item_type_stores } from "../stores/ItemTypeStore";
+import { Persister } from "./Persister";
+
+class HuntOptimizerPersister extends Persister {
+    persist_wanted_items(server: Server, wanted_items: WantedItem[]): void {
+        this.persist_for_server(
+            server,
+            "HuntOptimizerStore.wantedItems",
+            wanted_items.map(
+                ({ item_type, amount }): PersistedWantedItem => ({
+                    itemTypeId: item_type.id,
+                    amount,
+                })
+            )
+        );
+    }
+
+    async load_wanted_items(server: Server): Promise<WantedItem[]> {
+        const item_store = await item_type_stores.get(server).promise;
+
+        const persisted_wanted_items = await this.load_for_server<PersistedWantedItem[]>(
+            server,
+            "HuntOptimizerStore.wantedItems"
+        );
+        const wanted_items: WantedItem[] = [];
+
+        if (persisted_wanted_items) {
+            for (const { itemTypeId, itemKindId, amount } of persisted_wanted_items) {
+                const item =
+                    itemTypeId != undefined
+                        ? item_store.get_by_id(itemTypeId)
+                        : item_store.get_by_id(itemKindId!);
+
+                if (item) {
+                    wanted_items.push(new WantedItem(item, amount));
+                }
+            }
+        }
+
+        return wanted_items;
+    }
+}
+
+type PersistedWantedItem = {
+    itemTypeId?: number; // Should only be undefined if the legacy name is still used.
+    itemKindId?: number; // Legacy name, not persisted, only checked when loading.
+    amount: number;
+};
+
+export const hunt_optimizer_persister = new HuntOptimizerPersister();

src/persistence/Persister.ts

@@ -0,0 +1,32 @@
+import Logger from "js-logger";
+import { Server } from "../domain";
+
+const logger = Logger.get("persistence/Persister");
+
+export abstract class Persister {
+    protected persist_for_server(server: Server, key: string, data: any): void {
+        this.persist(key + "." + Server[server], data);
+    }
+
+    protected persist(key: string, data: any): void {
+        try {
+            localStorage.setItem(key, JSON.stringify(data));
+        } catch (e) {
+            logger.error(`Couldn't persist ${key}.`, e);
+        }
+    }
+
+    protected async load_for_server<T>(server: Server, key: string): Promise<T | undefined> {
+        return this.load(key + "." + Server[server]);
+    }
+
+    protected async load<T>(key: string): Promise<T | undefined> {
+        try {
+            const json = localStorage.getItem(key);
+            return json && JSON.parse(json);
+        } catch (e) {
+            logger.error(`Couldn't load ${key}.`, e);
+            return undefined;
+        }
+    }
+}

src/stores/HuntMethodStore.ts

@@ -3,6 +3,7 @@ import { autorun, IReactionDisposer, observable } from "mobx";
 import { HuntMethod, NpcType, Server, SimpleQuest } from "../domain";
 import { QuestDto } from "../dto";
 import { Loadable } from "../Loadable";
+import { hunt_method_persister } from "../persistence/HuntMethodPersister";
 import { ServerMap } from "./ServerMap";
 
 const logger = Logger.get("stores/HuntMethodStore");
@@ -63,54 +64,23 @@ class HuntMethodStore {
             );
         }
 
-        this.load_from_local_storage(methods, server);
+        await this.load_user_times(methods, server);
         return methods;
     }
 
-    private load_from_local_storage = (methods: HuntMethod[], server: Server) => {
-        try {
-            const method_user_times_json = localStorage.getItem(
-                `HuntMethodStore.methodUserTimes.${Server[server]}`
-            );
+    private load_user_times = async (methods: HuntMethod[], server: Server) => {
+        await hunt_method_persister.load_method_user_times(methods, server);
 
-            if (method_user_times_json) {
-                const user_times: StoredUserTimes = JSON.parse(method_user_times_json);
-
-                for (const method of methods) {
-                    method.user_time = user_times[method.id];
-                }
-            }
-
-            if (this.storage_disposer) {
-                this.storage_disposer();
-            }
-
-            this.storage_disposer = autorun(() => this.store_in_local_storage(methods, server));
-        } catch (e) {
-            logger.error(e);
+        if (this.storage_disposer) {
+            this.storage_disposer();
         }
+
+        this.storage_disposer = autorun(() => this.persist_user_times(methods, server));
     };
 
-    private store_in_local_storage = (methods: HuntMethod[], server: Server) => {
-        try {
-            const user_times: StoredUserTimes = {};
-
-            for (const method of methods) {
-                if (method.user_time != undefined) {
-                    user_times[method.id] = method.user_time;
-                }
-            }
-
-            localStorage.setItem(
-                `HuntMethodStore.methodUserTimes.${Server[server]}`,
-                JSON.stringify(user_times)
-            );
-        } catch (e) {
-            logger.error(e);
-        }
+    private persist_user_times = (methods: HuntMethod[], server: Server) => {
+        hunt_method_persister.persist_method_user_times(methods, server);
     };
 }
 
-type StoredUserTimes = { [method_id: string]: number };
-
 export const hunt_method_store = new HuntMethodStore();

src/stores/HuntOptimizerStore.ts

@@ -1,8 +1,9 @@
 import solver from "javascript-lp-solver";
-import { autorun, IObservableArray, observable, computed } from "mobx";
+import { autorun, computed, IObservableArray, observable } from "mobx";
 import {
     Difficulties,
     Difficulty,
+    Episode,
     HuntMethod,
     ItemType,
     KONDRIEU_PROB,
@@ -10,16 +11,12 @@ import {
     RARE_ENEMY_PROB,
     SectionId,
     SectionIds,
-    Server,
-    Episode,
 } from "../domain";
+import { hunt_optimizer_persister } from "../persistence/HuntOptimizerPersister";
 import { application_store } from "./ApplicationStore";
 import { hunt_method_store } from "./HuntMethodStore";
 import { item_drop_stores } from "./ItemDropStore";
 import { item_type_stores } from "./ItemTypeStore";
-import Logger from "js-logger";
-
-const logger = Logger.get("stores/HuntOptimizerStore");
 
 export class WantedItem {
     @observable readonly item_type: ItemType;
@@ -91,7 +88,7 @@ class HuntOptimizerStore {
     @observable result?: OptimalResult;
 
     constructor() {
-        this.initialize();
+        this.initialize_persistence();
     }
 
     optimize = async () => {
@@ -335,64 +332,18 @@ class HuntOptimizerStore {
         return name;
     }
 
-    private initialize = async () => {
-        try {
-            await this.load_from_local_storage();
-            autorun(this.store_in_local_storage);
-        } catch (e) {
-            logger.error(e);
-        }
-    };
-
-    private load_from_local_storage = async () => {
-        const wanted_items_json = localStorage.getItem(
-            `HuntOptimizerStore.wantedItems.${Server[application_store.current_server]}`
+    private initialize_persistence = async () => {
+        this.wanted_items.replace(
+            await hunt_optimizer_persister.load_wanted_items(application_store.current_server)
         );
 
-        if (wanted_items_json) {
-            const item_store = await item_type_stores.current.promise;
-            const wi: StoredWantedItem[] = JSON.parse(wanted_items_json);
-
-            const wanted_items: WantedItem[] = [];
-
-            for (const { itemTypeId, itemKindId, amount } of wi) {
-                const item =
-                    itemTypeId != undefined
-                        ? item_store.get_by_id(itemTypeId)
-                        : item_store.get_by_id(itemKindId!);
-
-                if (item) {
-                    wanted_items.push(new WantedItem(item, amount));
-                }
-            }
-
-            this.wanted_items.replace(wanted_items);
-        }
-    };
-
-    private store_in_local_storage = () => {
-        try {
-            localStorage.setItem(
-                `HuntOptimizerStore.wantedItems.${Server[application_store.current_server]}`,
-                JSON.stringify(
-                    this.wanted_items.map(
-                        ({ item_type: itemType, amount }): StoredWantedItem => ({
-                            itemTypeId: itemType.id,
-                            amount,
-                        })
-                    )
-                )
+        autorun(() => {
+            hunt_optimizer_persister.persist_wanted_items(
+                application_store.current_server,
+                this.wanted_items
             );
-        } catch (e) {
-            logger.error(e);
-        }
+        });
     };
 }
 
-type StoredWantedItem = {
-    itemTypeId?: number; // Should only be undefined if the legacy name is still used.
-    itemKindId?: number; // Legacy name.
-    amount: number;
-};
-
 export const hunt_optimizer_store = new HuntOptimizerStore();