peers syncing for a single user

src/db.ts

@@ -4,6 +4,9 @@
 //   email: string;
 // }
 
+
+// Efficiently storing data in indexdb: https://stackoverflow.com/a/62975917
+
 const postStoreName: string = "posts";
 let keyBase = "dandelion_posts_v1_"
 let key = "";
@@ -156,6 +159,60 @@ export async function addDataArray(userID: string, array: any[]): Promise<void>
     }
 }
 
+export async function mergeDataArray(userID: string, array:any[]): Promise<void> {
+    try {
+        const db = await openDatabase(userID);
+        const transaction = db.transaction(postStoreName, "readwrite");
+        const store = transaction.objectStore(postStoreName);
+        const index = store.index("postIDIndex");
+
+        transaction.oncomplete = () => {
+            console.log("Transaction completed successfully");
+            db.close();
+        };
+
+        transaction.onerror = (event) => {
+            console.error("Transaction error:", (event.target as any).error);
+            db.close();
+        };
+
+        let postsToWrite:any = [];
+
+        for (let post of array) {
+            try {
+                let havePost = await new Promise<boolean>((resolve, reject) => {
+                    const getRequest = index.getKey(post.post_id);
+
+                    getRequest.onerror = (e) => {
+                        console.log((e.target as IDBRequest).error);
+                        reject(e);
+                    };
+
+                    getRequest.onsuccess = async (e) => {
+                        const key = (e.target as IDBRequest).result;
+                        resolve(key !== undefined)
+                    };
+
+                });
+
+                // console.log(post.post_id, havePost);
+                if (!havePost ) {
+                    postsToWrite.push(post);
+                }
+
+            } catch (error) {
+                console.error("Error processing post:", error);
+            }
+        }
+
+        console.log(`Writing ${postsToWrite.length} posts`);
+
+        await addDataArray(userID, postsToWrite);
+    } catch (error) {
+        console.error("Error in opening database:", error);
+    }
+}
+
 export async function getData(userID: string, lowerID: Date, upperID: Date): Promise<any | undefined> {
     const db = await openDatabase(userID);
     const transaction = db.transaction(postStoreName, "readonly");
@@ -191,6 +248,7 @@ export async function getData(userID: string, lowerID: Date, upperID: Date): Pro
     });
 }
 
+
 export async function getAllData(userID: string): Promise<any | undefined> {
     const db = await openDatabase(userID);
     const transaction = db.transaction(postStoreName, "readonly");