prevent load functions from rerunning excessively

src/lib/flows/create-stream-flow/input-details.svelte

@@ -58,7 +58,7 @@
   import { getAddressDriverClient, getCallerClient } from '$lib/utils/get-drips-clients';
   import assert from '$lib/utils/assert';
   import { waitForAccountMetadata } from '$lib/utils/ipfs';
-  import { invalidateAll } from '$app/navigation';
+  import { invalidateAll } from '$lib/stores/fetched-data-cache/invalidate';
 
   const dispatch = createEventDispatcher<StepComponentEvents>();
 

src/lib/flows/edit-stream-flow/enter-new-details.svelte

@@ -56,7 +56,7 @@
   import { buildEditStreamBatch } from '$lib/utils/streams/streams';
   import assert from '$lib/utils/assert';
   import { waitForAccountMetadata } from '$lib/utils/ipfs';
-  import { invalidateAll } from '$app/navigation';
+  import { invalidateAll } from '$lib/stores/fetched-data-cache/invalidate';
   import walletStore from '$lib/stores/wallet/wallet.store';
 
   const dispatch = createEventDispatcher<StepComponentEvents>();

src/lib/flows/global-collect-flow/global-collect-flow-steps.ts

@@ -1,4 +1,4 @@
-import { invalidate } from '$app/navigation';
+import { invalidate } from '$lib/stores/fetched-data-cache/invalidate';
 import { makeStep } from '$lib/components/stepper/types';
 import SuccessStep from '$lib/components/success-step/success-step.svelte';
 import mapFilterUndefined from '$lib/utils/map-filter-undefined';

src/lib/flows/pause-flow/pause.svelte

@@ -26,7 +26,7 @@
   } from './__generated__/gql.generated';
   import { buildPauseStreamPopulatedTx } from '$lib/utils/streams/streams';
   import query from '$lib/graphql/dripsQL';
-  import { invalidateAll } from '$app/navigation';
+  import { invalidateAll } from '$lib/stores/fetched-data-cache/invalidate';
 
   const dispatch = createEventDispatcher<StepComponentEvents>();
 

src/lib/flows/unpause-flow/unpause.svelte

@@ -26,7 +26,7 @@
   } from './__generated__/gql.generated';
   import { buildUnpauseStreamPopulatedTx } from '$lib/utils/streams/streams';
   import query from '$lib/graphql/dripsQL';
-  import { invalidateAll } from '$app/navigation';
+  import { invalidateAll } from '$lib/stores/fetched-data-cache/invalidate';
 
   const dispatch = createEventDispatcher<StepComponentEvents>();
 

src/lib/flows/vote/vote.svelte

@@ -12,7 +12,7 @@
   import ListEditor from '$lib/components/list-editor/list-editor.svelte';
   import type { Writable } from 'svelte/store';
   import type { State } from './vote-flow-steps';
-  import { invalidateAll } from '$app/navigation';
+  import { invalidateAll } from '$lib/stores/fetched-data-cache/invalidate';
   import type { VotingRound } from '$lib/utils/multiplayer/schemas';
 
   const dispatch = createEventDispatcher<StepComponentEvents>();

src/lib/stores/fetched-data-cache/fetched-data-cache.store.ts

@@ -0,0 +1,60 @@
+import { get, writable } from 'svelte/store';
+
+interface State {
+  data: Record<string, unknown>;
+}
+
+const state = writable<State>({ data: {} });
+
+function set(key: string, value: unknown) {
+  state.update((s) => {
+    s.data[key] = value;
+    return s;
+  });
+}
+
+export function clear(key: string) {
+  state.update((s) => {
+    delete s.data[key];
+    return s;
+  });
+}
+
+export function clearAll() {
+  state.set({ data: {} });
+}
+
+/**
+ * Create a local "fetched data cache" that can be used to prevent data from being re-fetched
+ * on navigations to a page that has already previously been navigated to.
+ *
+ * **Important**: There is no magic for removing data from this store. If data of a page that uses
+ * this cache should be re-fetched, ensure that `invalidate` functions from `./invalidate.ts` are
+ * called with the appropriate keys.
+ *
+ * **Also important**: No runtime type checking is being done. You need to make sure that
+ *    1. The key you pass to this function is unique
+ *    2. The type you pass to this function is correct
+ *
+ * **Also important**: What this returns is only a wrapper around a global store. Even if this
+ * wrapper is abandoned, the values it wrote persist in the global store.
+ * @param key
+ * @returns
+ */
+export const makeFetchedDataCache = <T extends Record<string, unknown> | unknown[]>(
+  key: string,
+) => {
+  function read(): T | undefined {
+    return get(state).data[key] as T;
+  }
+
+  function write(v: T) {
+    set(key, v);
+  }
+
+  return {
+    subscribe: state.subscribe,
+    read,
+    write,
+  };
+};

src/lib/stores/fetched-data-cache/invalidate.ts

@@ -0,0 +1,19 @@
+import { invalidateAll as skInvalidateAll, invalidate as skInvalidate } from '$app/navigation';
+import { clear, clearAll } from './fetched-data-cache.store';
+
+/**
+ * Invalidate `key` in the local fetched data cache and re-run all load functions
+ * that depend on `key`.
+ */
+export async function invalidate(key: string) {
+  clear(key);
+  await skInvalidate(key);
+}
+
+/**
+ * Invalidate all keys in the local fetched data cache and re-run all currently active load functions.
+ */
+export async function invalidateAll() {
+  clearAll();
+  await skInvalidateAll();
+}

src/lib/stores/wallet/wallet.store.ts

@@ -18,7 +18,7 @@ import storedWritable from '@efstajas/svelte-stored-writable';
 import { z } from 'zod';
 import { isWalletUnlocked } from './utils/is-wallet-unlocked';
 import network, { getNetwork, isConfiguredChainId, type Network } from './network';
-import { invalidateAll } from '$app/navigation';
+import { invalidateAll } from '../fetched-data-cache/invalidate';
 
 const appsSdk = new SafeAppsSDK();
 

src/routes/app/(app)/+page.server.ts

@@ -1,7 +1,10 @@
 import { PROJECT_CARD_FRAGMENT } from '$lib/components/project-card/project-card.svelte';
 import query from '$lib/graphql/dripsQL';
 import { gql } from 'graphql-request';
-import type { ProjectsQuery, ProjectsQueryVariables } from './__generated__/gql.generated';
+import type {
+  ExploreProjectsQuery,
+  ExploreProjectsQueryVariables,
+} from './__generated__/gql.generated';
 import {
   ProjectSortField,
   ProjectVerificationStatus,
@@ -73,7 +76,7 @@ export const load = async ({ fetch }) => {
   );
 
   const fetchProjects = async () => {
-    const projectsRes = await query<ProjectsQuery, ProjectsQueryVariables>(
+    const projectsRes = await query<ExploreProjectsQuery, ExploreProjectsQueryVariables>(
       getProjectsQuery,
       getProjectsVariables,
       fetch,

src/routes/app/(app)/drip-lists/+page.ts

@@ -1,21 +1,33 @@
 import query from '$lib/graphql/dripsQL.js';
-import { error, redirect } from '@sveltejs/kit';
+import { redirect } from '@sveltejs/kit';
 import { gql } from 'graphql-request';
 import { DRIP_LISTS_PAGE_DRIP_LIST_FRAGMENT } from './+page.svelte';
 import { getVotingRounds } from '$lib/utils/multiplayer';
-import { mapSplitsFromMultiplayerResults } from '$lib/components/splits/splits.svelte';
+import {
+  mapSplitsFromMultiplayerResults,
+  type SplitsComponentSplitsReceiver,
+} from '$lib/components/splits/splits.svelte';
 import type {
   DripListsPageQuery,
   DripListsPageQueryVariables,
 } from './__generated__/gql.generated';
 import buildUrl from '$lib/utils/build-url';
 import getConnectedAddress from '$lib/utils/get-connected-address';
+import { makeFetchedDataCache } from '$lib/stores/fetched-data-cache/fetched-data-cache.store';
+import type { VotingRound } from '$lib/utils/multiplayer/schemas';
+
+type VotingRoundWithSplits = VotingRound & { splits: SplitsComponentSplitsReceiver[] };
+
+const fetchedDataCache = makeFetchedDataCache<{
+  dripLists: DripListsPageQuery['dripLists'];
+  votingRounds: VotingRoundWithSplits[];
+}>('dashboard:drip-lists');
 
 export const load = async ({ fetch }) => {
   const connectedAddress = getConnectedAddress();
 
   if (!connectedAddress) {
-    redirect(307, buildUrl('/app/connect', { backTo: '/app/drip-lists' }));
+    throw redirect(307, buildUrl('/app/connect', { backTo: '/app/drip-lists' }));
   }
 
   const dripListsPageQuery = gql`
@@ -27,6 +39,12 @@ export const load = async ({ fetch }) => {
     }
   `;
 
+  const locallyCached = fetchedDataCache.read();
+
+  if (locallyCached) {
+    return locallyCached;
+  }
+
   const [votingRounds, dripListsRes] = await Promise.all([
     await getVotingRounds({ publisherAddress: connectedAddress }, fetch),
     await query<DripListsPageQuery, DripListsPageQueryVariables>(
@@ -47,9 +65,10 @@ export const load = async ({ fetch }) => {
     splits: votingRoundsSplits[votingRoundsWithResults.findIndex((vR) => vR.id === v.id)] ?? [],
   }));
 
-  if (!connectedAddress) {
-    return error(401, 'Unauthorized');
-  }
+  fetchedDataCache.write({
+    dripLists: dripListsRes.dripLists,
+    votingRounds: votingRoundsWithSplits,
+  });
 
   return { dripLists: dripListsRes.dripLists, votingRounds: votingRoundsWithSplits };
 };

src/routes/app/(app)/funds/+page.ts

@@ -6,6 +6,9 @@ import { redirect } from '@sveltejs/kit';
 import { USER_BALANCES_FRAGMENT } from './sections/balances.section.svelte';
 import buildUrl from '$lib/utils/build-url';
 import getConnectedAddress from '$lib/utils/get-connected-address';
+import { makeFetchedDataCache } from '$lib/stores/fetched-data-cache/fetched-data-cache.store';
+
+const fetchedDataCache = makeFetchedDataCache<UserStreamsQuery>('dashboard:funds');
 
 export const load = async ({ fetch }) => {
   const connectedAddress = getConnectedAddress();
@@ -29,13 +32,17 @@ export const load = async ({ fetch }) => {
     }
   `;
 
-  const res = await query<UserStreamsQuery, UserStreamsQueryVariables>(
-    streamsQuery,
-    {
-      connectedAddress,
-    },
-    fetch,
-  );
+  const res =
+    fetchedDataCache.read() ??
+    (await query<UserStreamsQuery, UserStreamsQueryVariables>(
+      streamsQuery,
+      {
+        connectedAddress,
+      },
+      fetch,
+    ));
+
+  fetchedDataCache.write(res);
 
   return {
     streams: res.userByAddress.streams,

src/routes/app/(app)/projects/+page.ts

@@ -5,6 +5,9 @@ import type { ProjectsPageQuery, ProjectsPageQueryVariables } from './__generate
 import { redirect } from '@sveltejs/kit';
 import buildUrl from '$lib/utils/build-url';
 import getConnectedAddress from '$lib/utils/get-connected-address';
+import { makeFetchedDataCache } from '$lib/stores/fetched-data-cache/fetched-data-cache.store';
+
+const fetchedDataCache = makeFetchedDataCache<ProjectsPageQuery>('dashboard:projects');
 
 export const load = async ({ fetch }) => {
   const connectedAddress = getConnectedAddress();
@@ -22,11 +25,15 @@ export const load = async ({ fetch }) => {
     }
   `;
 
-  const res = await query<ProjectsPageQuery, ProjectsPageQueryVariables>(
-    projectsQuery,
-    { address: connectedAddress },
-    fetch,
-  );
+  const res =
+    fetchedDataCache.read() ??
+    (await query<ProjectsPageQuery, ProjectsPageQueryVariables>(
+      projectsQuery,
+      { address: connectedAddress },
+      fetch,
+    ));
+
+  fetchedDataCache.write(res);
 
   return { projects: res.projects };
 };

src/routes/app/+layout.ts

@@ -3,25 +3,32 @@ import query from '$lib/graphql/dripsQL.js';
 import { gql } from 'graphql-request';
 import type { UserQuery, UserQueryVariables } from './__generated__/gql.generated';
 import getConnectedAddress from '$lib/utils/get-connected-address.js';
+import { makeFetchedDataCache } from '$lib/stores/fetched-data-cache/fetched-data-cache.store';
+
+const fetchedDataCache = makeFetchedDataCache<UserQuery>('app-layout:user');
 
 export const load = async ({ url: { pathname }, fetch, depends }) => {
   const connectedAddress = getConnectedAddress();
 
   if (connectedAddress) {
     depends('app-layout:user');
 
-    const user = await query<UserQuery, UserQueryVariables>(
-      gql`
-        ${HEADER_USER_FRAGMENT}
-        query User($connectedAddress: String!) {
-          userByAddress(address: $connectedAddress) {
-            ...HeaderUser
+    const user =
+      fetchedDataCache.read() ??
+      (await query<UserQuery, UserQueryVariables>(
+        gql`
+          ${HEADER_USER_FRAGMENT}
+          query User($connectedAddress: String!) {
+            userByAddress(address: $connectedAddress) {
+              ...HeaderUser
+            }
           }
-        }
-      `,
-      { connectedAddress },
-      fetch,
-    );
+        `,
+        { connectedAddress },
+        fetch,
+      ));
+
+    fetchedDataCache.write(user);
 
     return { user: user.userByAddress, pathname };
   }