From cc4e8ddc85d36f29a7385a7f4eb08c77f46b3af6 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Wed, 31 Jul 2019 01:33:56 +0200
Subject: headless wallet WIP

---
 src/db.ts | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 src/db.ts

(limited to 'src/db.ts')

diff --git a/src/db.ts b/src/db.ts
new file mode 100644
index 000000000..0916ef145
--- /dev/null
+++ b/src/db.ts
@@ -0,0 +1,122 @@
+import { Stores, WALLET_DB_VERSION } from "./dbTypes";
+import { Store, Index } from "./query";
+
+const DB_NAME = "taler";
+
+/**
+ * Return a promise that resolves
+ * to the taler wallet db.
+ */
+export function openTalerDb(
+  idbFactory: IDBFactory,
+  onVersionChange: () => void,
+  onUpgradeUnsupported: (oldVersion: number, newVersion: number) => void,
+): Promise<IDBDatabase> {
+  return new Promise<IDBDatabase>((resolve, reject) => {
+    const req = idbFactory.open(DB_NAME, WALLET_DB_VERSION);
+    req.onerror = e => {
+      console.log("taler database error", e);
+      reject(e);
+    };
+    req.onsuccess = e => {
+      req.result.onversionchange = (evt: IDBVersionChangeEvent) => {
+        console.log(
+          `handling live db version change from ${evt.oldVersion} to ${
+            evt.newVersion
+          }`,
+        );
+        req.result.close();
+        onVersionChange();
+      };
+      resolve(req.result);
+    };
+    req.onupgradeneeded = e => {
+      const db = req.result;
+      console.log(
+        `DB: upgrade needed: oldVersion=${e.oldVersion}, newVersion=${
+          e.newVersion
+        }`,
+      );
+      switch (e.oldVersion) {
+        case 0: // DB does not exist yet
+          for (const n in Stores) {
+            if ((Stores as any)[n] instanceof Store) {
+              const si: Store<any> = (Stores as any)[n];
+              const s = db.createObjectStore(si.name, si.storeParams);
+              for (const indexName in si as any) {
+                if ((si as any)[indexName] instanceof Index) {
+                  const ii: Index<any, any> = (si as any)[indexName];
+                  s.createIndex(ii.indexName, ii.keyPath, ii.options);
+                }
+              }
+            }
+          }
+          break;
+        default:
+          if (e.oldVersion !== WALLET_DB_VERSION) {
+            onUpgradeUnsupported(e.oldVersion, WALLET_DB_VERSION);
+            throw Error("incompatible DB");
+          }
+          break;
+      }
+    };
+  });
+}
+
+export function exportDb(db: IDBDatabase): Promise<any> {
+  const dump = {
+    name: db.name,
+    stores: {} as { [s: string]: any },
+    version: db.version,
+  };
+
+  return new Promise((resolve, reject) => {
+    const tx = db.transaction(Array.from(db.objectStoreNames));
+    tx.addEventListener("complete", () => {
+      resolve(dump);
+    });
+    // tslint:disable-next-line:prefer-for-of
+    for (let i = 0; i < db.objectStoreNames.length; i++) {
+      const name = db.objectStoreNames[i];
+      const storeDump = {} as { [s: string]: any };
+      dump.stores[name] = storeDump;
+      tx.objectStore(name)
+        .openCursor()
+        .addEventListener("success", (e: Event) => {
+          const cursor = (e.target as any).result;
+          if (cursor) {
+            storeDump[cursor.key] = cursor.value;
+            cursor.continue();
+          }
+        });
+    }
+  });
+}
+
+export function importDb(db: IDBDatabase, dump: any): Promise<void> {
+  console.log("importing db", dump);
+  return new Promise<void>((resolve, reject) => {
+    const tx = db.transaction(Array.from(db.objectStoreNames), "readwrite");
+    if (dump.stores) {
+      for (const storeName in dump.stores) {
+        const objects = [];
+        const dumpStore = dump.stores[storeName];
+        for (const key in dumpStore) {
+          objects.push(dumpStore[key]);
+        }
+        console.log(`importing ${objects.length} records into ${storeName}`);
+        const store = tx.objectStore(storeName);
+        for (const obj of objects) {
+          store.put(obj);
+        }
+      }
+    }
+    tx.addEventListener("complete", () => {
+      resolve();
+    });
+  });
+}
+
+export function deleteDb(idbFactory: IDBFactory) {
+  idbFactory.deleteDatabase(DB_NAME);
+}
-- 
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