fix(adapter): fix progress event emitting; (#6518)

lib/adapters/http.js

@@ -24,6 +24,7 @@ import formDataToStream from "../helpers/formDataToStream.js";
 import readBlob from "../helpers/readBlob.js";
 import ZlibHeaderTransformStream from '../helpers/ZlibHeaderTransformStream.js';
 import callbackify from "../helpers/callbackify.js";
+import {progressEventReducer, progressEventDecorator, asyncDecorator} from "../helpers/progressEventReducer.js";
 
 const zlibOptions = {
   flush: zlib.constants.Z_SYNC_FLUSH,
@@ -45,6 +46,14 @@ const supportedProtocols = platform.protocols.map(protocol => {
   return protocol + ':';
 });
 
+const flushOnFinish = (stream, [throttled, flush]) => {
+  stream
+    .on('end', flush)
+    .on('error', flush);
+
+  return throttled;
+}
+
 /**
  * If the proxy or config beforeRedirects functions are defined, call them with the options
  * object.
@@ -278,8 +287,7 @@ export default isHttpAdapterSupported && function httpAdapter(config) {
     // Only set header if it hasn't been set in config
     headers.set('User-Agent', 'axios/' + VERSION, false);
 
-    const onDownloadProgress = config.onDownloadProgress;
-    const onUploadProgress = config.onUploadProgress;
+    const {onUploadProgress, onDownloadProgress} = config;
     const maxRate = config.maxRate;
     let maxUploadRate = undefined;
     let maxDownloadRate = undefined;
@@ -352,15 +360,16 @@ export default isHttpAdapterSupported && function httpAdapter(config) {
       }
 
       data = stream.pipeline([data, new AxiosTransformStream({
-        length: contentLength,
         maxRate: utils.toFiniteNumber(maxUploadRate)
       })], utils.noop);
 
-      onUploadProgress && data.on('progress', progress => {
-        onUploadProgress(Object.assign(progress, {
-          upload: true
-        }));
-      });
+      onUploadProgress && data.on('progress', flushOnFinish(
+        data,
+        progressEventDecorator(
+          contentLength,
+          progressEventReducer(asyncDecorator(onUploadProgress), false, 3)
+        )
+      ));
     }
 
     // HTTP basic authentication
@@ -459,17 +468,18 @@ export default isHttpAdapterSupported && function httpAdapter(config) {
 
       const responseLength = +res.headers['content-length'];
 
-      if (onDownloadProgress) {
+      if (onDownloadProgress || maxDownloadRate) {
         const transformStream = new AxiosTransformStream({
-          length: utils.toFiniteNumber(responseLength),
           maxRate: utils.toFiniteNumber(maxDownloadRate)
         });
 
-        onDownloadProgress && transformStream.on('progress', progress => {
-          onDownloadProgress(Object.assign(progress, {
-            download: true
-          }));
-        });
+        onDownloadProgress && transformStream.on('progress', flushOnFinish(
+          transformStream,
+          progressEventDecorator(
+            responseLength,
+            progressEventReducer(asyncDecorator(onDownloadProgress), true, 3)
+          )
+        ));
 
         streams.push(transformStream);
       }