feat: rest request sync with firestore

helpers/fb/request.ts

@@ -0,0 +1,83 @@
+import firebase from "firebase/app"
+import "firebase/firestore"
+import {
+  audit,
+  combineLatest,
+  distinctUntilChanged,
+  EMPTY,
+  from,
+  map,
+  Subscription,
+} from "rxjs"
+import {
+  HoppRESTRequest,
+  translateToNewRequest,
+} from "../types/HoppRESTRequest"
+import { currentUser$, HoppUser } from "./auth"
+import { restRequest$ } from "~/newstore/RESTSession"
+
+/**
+ * Writes a request to a user's firestore sync
+ *
+ * @param user The user to write to
+ * @param request The request to write to the request sync
+ */
+function writeCurrentRequest(user: HoppUser, request: HoppRESTRequest) {
+  return firebase
+    .firestore()
+    .collection("users")
+    .doc(user.uid)
+    .collection("requests")
+    .doc("rest")
+    .set(request)
+}
+
+/**
+ * Loads the synced request from the firestore sync
+ *
+ * @returns Fetched request object if exists else null
+ */
+export async function loadRequestFromSync(): Promise<HoppRESTRequest | null> {
+  const currentUser = currentUser$.value
+
+  if (!currentUser)
+    throw new Error("Cannot load request from sync without login")
+
+  const doc = await firebase
+    .firestore()
+    .collection("users")
+    .doc(currentUser.uid)
+    .collection("requests")
+    .doc("rest")
+    .get()
+
+  const data = doc.data()
+
+  if (!data) return null
+  else return translateToNewRequest(data)
+}
+
+/**
+ * Performs sync of the REST Request session with Firestore.
+ *
+ * @returns A subscription to the sync observable stream.
+ * Unsubscribe to stop syncing.
+ */
+export function startRequestSync(): Subscription {
+  const sub = combineLatest([
+    currentUser$,
+    restRequest$.pipe(distinctUntilChanged()),
+  ])
+    .pipe(
+      map(([user, request]) =>
+        user ? from(writeCurrentRequest(user, request)) : EMPTY
+      ),
+      audit((x) => x)
+    )
+    .subscribe(() => {
+      // NOTE: This subscription should be kept
+      console.log("synced request")
+    })
+
+  return sub
+}