add server to monorepo.

packages/server/src/services/Cache/index.ts

@@ -0,0 +1,49 @@
+import NodeCache from 'node-cache';
+
+export default class Cache {
+  cache: NodeCache;
+
+  constructor(config?: object) {
+    this.cache = new NodeCache({
+      useClones: false,
+      ...config,
+    });
+  }
+
+  get(key: string, storeFunction: () => Promise<any>) {
+    const value = this.cache.get(key);
+
+    if (value) {
+      return Promise.resolve(value);
+    }
+    return storeFunction().then((result) => {
+      this.cache.set(key, result);
+      return result;
+    });
+  }
+
+  set(key: string, results: any) {
+    this.cache.set(key, results);
+  }
+
+  del(keys: string) {
+    this.cache.del(keys);
+  }
+
+  delStartWith(startStr = '') {
+    if (!startStr) {
+      return;
+    }
+
+    const keys = this.cache.keys();
+    for (const key of keys) {
+      if (key.indexOf(startStr) === 0) {
+        this.del(key);
+      }
+    }
+  }
+
+  flush() {
+    this.cache.flushAll();
+  }
+}