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diff --git a/opendc-web/opendc-web-ui/src/data/topology.js b/opendc-web/opendc-web-ui/src/data/topology.js
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+/*
+ * Copyright (c) 2021 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+import { useQuery } from 'react-query'
+import { addTopology, deleteTopology, fetchTopologiesOfProject, fetchTopology, updateTopology } from '../api/topologies'
+
+/**
+ * Configure the query defaults for the topology endpoints.
+ */
+export function configureTopologyClient(queryClient, auth) {
+    queryClient.setQueryDefaults('topologies', { queryFn: ({ queryKey }) => fetchTopology(auth, queryKey[1]) })
+    queryClient.setQueryDefaults('project-topologies', {
+        queryFn: ({ queryKey }) => fetchTopologiesOfProject(auth, queryKey[1]),
+    })
+
+    queryClient.setMutationDefaults('addTopology', {
+        mutationFn: (data) => addTopology(auth, data),
+        onSuccess: async (result) => {
+            queryClient.setQueryData(['projects', result.projectId], (old) => ({
+                ...old,
+                topologyIds: [...old.topologyIds, result._id],
+            }))
+            queryClient.setQueryData(['project-topologies', result.projectId], (old = []) => [...old, result])
+            queryClient.setQueryData(['topologies', result._id], result)
+        },
+    })
+    queryClient.setMutationDefaults('updateTopology', {
+        mutationFn: (data) => updateTopology(auth, data),
+        onSuccess: (result) => queryClient.setQueryData(['topologies', result._id], result),
+    })
+    queryClient.setMutationDefaults('deleteTopology', {
+        mutationFn: (id) => deleteTopology(auth, id),
+        onSuccess: async (result) => {
+            queryClient.setQueryData(['projects', result.projectId], (old) => ({
+                ...old,
+                topologyIds: old.topologyIds.filter((id) => id !== result._id),
+            }))
+            queryClient.setQueryData(['project-topologies', result.projectId], (old = []) =>
+                old.filter((topology) => topology._id !== result._id)
+            )
+            queryClient.removeQueries(['topologies', result._id])
+        },
+    })
+}
+
+/**
+ * Return the current active topology.
+ */
+export function useTopology(topologyId, options = {}) {
+    return useQuery(['topologies', topologyId], { enabled: !!topologyId, ...options })
+}
+
+/**
+ * Return the topologies of the specified project.
+ */
+export function useProjectTopologies(projectId, options = {}) {
+    return useQuery(['project-topologies', projectId], { enabled: !!projectId, ...options })
+}