Real-time collaboration within space (#411)

plugos/lib/kv_store.json_file.ts

@@ -0,0 +1,71 @@
+import { KV, KVStore } from "./kv_store.ts";
+
+export class JSONKVStore implements KVStore {
+  private data: { [key: string]: any } = {};
+
+  async load(path: string) {
+    this.loadString(await Deno.readTextFile(path));
+  }
+
+  loadString(jsonString: string) {
+    this.data = JSON.parse(jsonString);
+  }
+
+  async save(path: string) {
+    await Deno.writeTextFile(path, JSON.stringify(this.data));
+  }
+
+  del(key: string): Promise<void> {
+    delete this.data[key];
+    return Promise.resolve();
+  }
+
+  deletePrefix(prefix: string): Promise<void> {
+    for (const key in this.data) {
+      if (key.startsWith(prefix)) {
+        delete this.data[key];
+      }
+    }
+    return Promise.resolve();
+  }
+
+  deleteAll(): Promise<void> {
+    this.data = {};
+    return Promise.resolve();
+  }
+
+  set(key: string, value: any): Promise<void> {
+    this.data[key] = value;
+    return Promise.resolve();
+  }
+  batchSet(kvs: KV[]): Promise<void> {
+    for (const kv of kvs) {
+      this.data[kv.key] = kv.value;
+    }
+    return Promise.resolve();
+  }
+  batchDelete(keys: string[]): Promise<void> {
+    for (const key of keys) {
+      delete this.data[key];
+    }
+    return Promise.resolve();
+  }
+  batchGet(keys: string[]): Promise<any[]> {
+    return Promise.resolve(keys.map((key) => this.data[key]));
+  }
+  get(key: string): Promise<any> {
+    return Promise.resolve(this.data[key]);
+  }
+  has(key: string): Promise<boolean> {
+    return Promise.resolve(key in this.data);
+  }
+  queryPrefix(keyPrefix: string): Promise<{ key: string; value: any }[]> {
+    const results: { key: string; value: any }[] = [];
+    for (const key in this.data) {
+      if (key.startsWith(keyPrefix)) {
+        results.push({ key, value: this.data[key] });
+      }
+    }
+    return Promise.resolve(results);
+  }
+}