Fix - backport files remap for root.cern website

CI fails too often with plain root.cern website

Author: linev

modules/core.mjs

@@ -277,7 +277,15 @@ settings = {
      * @desc Some http server has limitations for number of bytes rannges therefore let change maximal number via setting
      * @default 200 */
    MaxRanges: 200,
-  /** @summary Configure xhr.withCredentials = true when submitting http requests from JSROOT */
+   /** @summary File read timeout in ms
+    * @desc Configures timeout for each http operation for reading ROOT files
+    * @default 0 */
+   FilesTimeout: 0,
+   /** @summary Default remap object for files loading
+       * @desc Allows to retry files reading if original URL fails
+       * @private */
+   FilesRemap: { 'https://root.cern/': 'https://root-eos.web.cern.ch/' },
+   /** @summary Configure xhr.withCredentials = true when submitting http requests from JSROOT */
    WithCredentials: false,
    /** @summary Skip streamer infos from the GUI */
    SkipStreamerInfos: false,

modules/io.mjs

@@ -2660,6 +2660,7 @@ class TFile {
       this.fStreamers = 0;
       this.fStreamerInfos = null;
       this.fFileName = '';
+      this.fTimeout = settings.FilesTimeout ?? 0;
       this.fStreamers = [];
       this.fBasicTypes = {}; // custom basic types, in most case enumerations
 
@@ -2692,6 +2693,28 @@ class TFile {
       this.fFileName = pos >= 0 ? this.fURL.slice(pos + 1) : this.fURL;
    }
 
+   /** @summary Set timeout for File instance
+     * @desc Timeout used when submitting http requests to the server */
+   setTimeout(v) {
+      this.fTimeout = v;
+   }
+
+   /** @summary Assign remap for web servers
+    * @desc Allows to specify fallback server if main server fails
+    * @param {Object} remap - looks like { 'https://original.server/': 'https://fallback.server/' } */
+   assignRemap(remap) {
+      if (!remap && !isObject(remap))
+         return;
+
+      for (const key in remap) {
+         if (this.fURL.indexOf(key) === 0) {
+            this.fURL2 = remap[key] + this.fURL.slice(key.length);
+            if (!this.fTimeout)
+               this.fTimeout = 10000;
+         }
+      }
+   }
+
    /** @summary Assign BufferArray with file contentOpen file
      * @private */
    assignFileContent(bufArray) {
@@ -2719,15 +2742,23 @@ class TFile {
             blobs = [], // array of requested segments
             promise = new Promise((resolve, reject) => { resolveFunc = resolve; rejectFunc = reject; });
 
-      let fileurl = file.fURL,
-          first = 0, last = 0,
+      let fileurl, first = 0, last = 0,
           // eslint-disable-next-line prefer-const
           read_callback, first_req,
           first_block_retry = false;
 
-      if (isStr(filename) && filename) {
-         const pos = fileurl.lastIndexOf('/');
-         fileurl = (pos < 0) ? filename : fileurl.slice(0, pos + 1) + filename;
+      function setFileUrl(use_second) {
+         if (use_second) {
+            console.log('Failure - try to repait with URL2', file.fURL2);
+            file.fURL = file.fURL2;
+            delete file.fURL2;
+         }
+
+         fileurl = file.fURL;
+         if (isStr(filename) && filename) {
+            const pos = fileurl.lastIndexOf('/');
+            fileurl = (pos < 0) ? filename : fileurl.slice(0, pos + 1) + filename;
+         }
       }
 
       function send_new_request(increment) {
@@ -2759,6 +2790,9 @@ class TFile {
                xhr.expected_size = Math.max(Math.round(1.1 * totalsz), totalsz + 200); // 200 if offset for the potential gzip
             }
 
+            if (file.fTimeout)
+               xhr.timeout = file.fTimeout;
+
             if (isFunc(progress_callback) && isFunc(xhr.addEventListener)) {
                let sum1 = 0, sum2 = 0, sum_total = 0;
                for (let n = 1; n < place.length; n += 2) {
@@ -2798,6 +2832,10 @@ class TFile {
                file.fUseStampPar = false;
                return send_new_request();
             }
+            if (file.fURL2) {
+               setFileUrl(true);
+               return send_new_request();
+            }
             if (file.fAcceptRanges) {
                file.fAcceptRanges = false;
                first_block_retry = true;
@@ -2850,6 +2888,11 @@ class TFile {
                return send_new_request();
             }
 
+            if (first_block && file.fURL2) {
+               setFileUrl(true);
+               return send_new_request();
+            }
+
             return rejectFunc(Error('Fail to read with several ranges'));
          }
 
@@ -2996,6 +3039,8 @@ class TFile {
          send_new_request(true);
       };
 
+      setFileUrl();
+
       return send_new_request(true).then(() => promise);
    }
 
@@ -3865,8 +3910,10 @@ function openFile(arg) {
    if (!file && isObject(arg) && arg.size && arg.name)
       file = new TLocalFile(arg);
 
-   if (!file)
+   if (!file) {
       file = new TFile(arg);
+      file.assignRemap(settings.FilesRemap);
+   }
 
    return file._open();
 }