Sync engine (#298)

Fixes #261

plug-api/silverbullet-syscall/sync.ts

@@ -0,0 +1,28 @@
+import type { SyncStatusItem } from "../../common/spaces/sync.ts";
+import { syscall } from "./syscall.ts";
+
+export type SyncEndpoint = {
+  url: string;
+  user?: string;
+  password?: string;
+};
+
+// Perform a sync with the server, based on the given status (to be persisted)
+// returns a new sync status to persist
+export function sync(
+  endpoint: SyncEndpoint,
+  snapshot: Record<string, SyncStatusItem>,
+): Promise<
+  {
+    snapshot: Record<string, SyncStatusItem>;
+    operations: number;
+    error?: string;
+  }
+> {
+  return syscall("sync.sync", endpoint, snapshot);
+}
+
+// Checks the sync endpoint for connectivity and authentication, throws and Error on failure
+export function check(endpoint: SyncEndpoint): Promise<void> {
+  return syscall("sync.check", endpoint);
+}