avoid duplicate api call

frontend/src/plugins/api.ts

@@ -1,12 +1,29 @@
-import axios from 'axios'
+import axios from 'axios';
 
 axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded; charset=UTF-8'
 axios.defaults.headers.common['X-Requested-With'] = 'XMLHttpRequest'
 
 axios.defaults.baseURL = "./"
+const pendingRequests = new Map()
 
 axios.interceptors.request.use(
     (config) => {
+        // Generate a unique key for the request
+        const requestKey = `${config.method}:${config.url}`
+
+        // Check if there is already a pending request with the same key
+        if (pendingRequests.has(requestKey)) {
+            const cancelSource = pendingRequests.get(requestKey)
+            cancelSource.cancel('Duplicate request cancelled')
+        }
+
+        // Create a new cancel token for the request
+        const cancelSource = axios.CancelToken.source()
+        config.cancelToken = cancelSource.token
+
+        // Store the cancel token in the pending requests map
+        pendingRequests.set(requestKey, cancelSource)
+
         if (config.data instanceof FormData) {
             config.headers['Content-Type'] = 'multipart/form-data'
         }
@@ -15,6 +32,26 @@ axios.interceptors.request.use(
     (error) => Promise.reject(error),
 )
 
+axios.interceptors.response.use(
+    (response) => {
+        // Remove the request from the pending requests map
+        const requestKey = `${response.config.method}:${response.config.url}`
+        pendingRequests.delete(requestKey)
+        return response
+    },
+    (error) => {
+        if (axios.isCancel(error)) {
+            // Handle duplicate request cancellation here if needed
+            console.warn(error.message)
+        } else {
+            // Remove the request from the pending requests map on error
+            const requestKey = `${error.config.method}:${error.config.url}`
+            pendingRequests.delete(requestKey)
+        }
+        return Promise.reject(error)
+    }
+);
+
 const api = axios.create()
 
-export default api
+export default api