Init (#1)

backend/settings.ts

@@ -0,0 +1,174 @@
+import { R } from "redbean-node";
+import { log } from "./log";
+
+export class Settings {
+
+    /**
+     *  Example:
+     *      {
+     *         key1: {
+     *             value: "value2",
+     *             timestamp: 12345678
+     *         },
+     *         key2: {
+     *             value: 2,
+     *             timestamp: 12345678
+     *         },
+     *     }
+     * @type {{}}
+     */
+    static cacheList = {
+
+    };
+
+    static cacheCleaner = null;
+
+    /**
+     * Retrieve value of setting based on key
+     * @param {string} key Key of setting to retrieve
+     * @returns {Promise<any>} Value
+     */
+    static async get(key) {
+
+        // Start cache clear if not started yet
+        if (!Settings.cacheCleaner) {
+            Settings.cacheCleaner = setInterval(() => {
+                log.debug("settings", "Cache Cleaner is just started.");
+                for (key in Settings.cacheList) {
+                    if (Date.now() - Settings.cacheList[key].timestamp > 60 * 1000) {
+                        log.debug("settings", "Cache Cleaner deleted: " + key);
+                        delete Settings.cacheList[key];
+                    }
+                }
+
+            }, 60 * 1000);
+        }
+
+        // Query from cache
+        if (key in Settings.cacheList) {
+            const v = Settings.cacheList[key].value;
+            log.debug("settings", `Get Setting (cache): ${key}: ${v}`);
+            return v;
+        }
+
+        const value = await R.getCell("SELECT `value` FROM setting WHERE `key` = ? ", [
+            key,
+        ]);
+
+        try {
+            const v = JSON.parse(value);
+            log.debug("settings", `Get Setting: ${key}: ${v}`);
+
+            Settings.cacheList[key] = {
+                value: v,
+                timestamp: Date.now()
+            };
+
+            return v;
+        } catch (e) {
+            return value;
+        }
+    }
+
+    /**
+     * Sets the specified setting to specified value
+     * @param {string} key Key of setting to set
+     * @param {any} value Value to set to
+     * @param {?string} type Type of setting
+     * @returns {Promise<void>}
+     */
+    static async set(key, value, type = null) {
+
+        let bean = await R.findOne("setting", " `key` = ? ", [
+            key,
+        ]);
+        if (!bean) {
+            bean = R.dispense("setting");
+            bean.key = key;
+        }
+        bean.type = type;
+        bean.value = JSON.stringify(value);
+        await R.store(bean);
+
+        Settings.deleteCache([ key ]);
+    }
+
+    /**
+     * Get settings based on type
+     * @param {string} type The type of setting
+     * @returns {Promise<Bean>} Settings
+     */
+    static async getSettings(type) {
+        const list = await R.getAll("SELECT `key`, `value` FROM setting WHERE `type` = ? ", [
+            type,
+        ]);
+
+        const result = {};
+
+        for (const row of list) {
+            try {
+                result[row.key] = JSON.parse(row.value);
+            } catch (e) {
+                result[row.key] = row.value;
+            }
+        }
+
+        return result;
+    }
+
+    /**
+     * Set settings based on type
+     * @param {string} type Type of settings to set
+     * @param {object} data Values of settings
+     * @returns {Promise<void>}
+     */
+    static async setSettings(type, data) {
+        const keyList = Object.keys(data);
+
+        const promiseList = [];
+
+        for (const key of keyList) {
+            let bean = await R.findOne("setting", " `key` = ? ", [
+                key
+            ]);
+
+            if (bean == null) {
+                bean = R.dispense("setting");
+                bean.type = type;
+                bean.key = key;
+            }
+
+            if (bean.type === type) {
+                bean.value = JSON.stringify(data[key]);
+                promiseList.push(R.store(bean));
+            }
+        }
+
+        await Promise.all(promiseList);
+
+        Settings.deleteCache(keyList);
+    }
+
+    /**
+     * Delete selected keys from settings cache
+     * @param {string[]} keyList Keys to remove
+     * @returns {void}
+     */
+    static deleteCache(keyList) {
+        for (const key of keyList) {
+            delete Settings.cacheList[key];
+        }
+    }
+
+    /**
+     * Stop the cache cleaner if running
+     * @returns {void}
+     */
+    static stopCacheCleaner() {
+        if (Settings.cacheCleaner) {
+            clearInterval(Settings.cacheCleaner);
+            Settings.cacheCleaner = null;
+        }
+    }
+}
+