Merge pull request #4293 from overleaf/jpa-pdf-js-error-handling

[frontend] fix broken PDF preview caused by missing error handling

GitOrigin-RevId: a7bba8d1b351a53fb20eb670d2ae4c6d215d0d85

services/web/frontend/js/ide/pdfng/directives/pdfJsLoader.js

@@ -18,8 +18,8 @@
  * to customise the loader's options. However the rest of the file is identical
  * to the one provided by PDF.js.
  */
-var pdfjs = require('pdfjs-dist/build/pdf.js')
-var PdfjsWorker = require('pdfjs-dist/build/pdf.worker.js')
+var pdfjs = require('libs/pdfjs-dist/build/pdf.js')
+var PdfjsWorker = require('libs/pdfjs-dist/build/pdf.worker.js')
 
 if (typeof window !== 'undefined' && 'Worker' in window) {
   pdfjs.GlobalWorkerOptions.workerPort = new PdfjsWorker()

services/web/frontend/js/ide/pdfng/directives/pdfRenderer.js

@@ -71,19 +71,20 @@ export default App.factory(
             disableAutoFetch: !!this.options.disableAutoFetch,
             disableStream: !!this.options.disableAutoFetch,
           })
+          this.errorCallback = this.options.errorCallback
+          this.pageSizeChangeCallback = this.options.pageSizeChangeCallback
           this.pdfjs.onProgress = this.options.progressCallback
           this.document = this.pdfjs
           this.navigateFn = this.options.navigateFn
           this.spinner = new pdfSpinner()
           this.resetState()
-          this.document.promise.then(pdfDocument => {
+          this.document.promise
+            .then(pdfDocument => {
               return pdfDocument.getDownloadInfo().then(() => {
                 return this.options.loadedCallback()
               })
             })
-          this.errorCallback = this.options.errorCallback
-          this.pageSizeChangeCallback = this.options.pageSizeChangeCallback
-          this.pdfjs.promise.catch(exception => {
+            .catch(exception => {
               // error getting document
               return this.errorCallback(exception)
             })
@@ -525,10 +526,12 @@ export default App.factory(
         destroy() {
           this.shuttingDown = true
           this.resetState()
-          return this.pdfjs.promise.then(function (document) {
+          return this.pdfjs.promise
+            .then(function (document) {
               document.cleanup()
               return document.destroy()
             })
+            .catch(() => {})
         }
       }
       PDFRenderer.initClass()

services/web/frontend/js/vendor/libs/pdfjs-dist/CHANGELOG.md

@@ -0,0 +1,52 @@
+# 2021-07-05
+
+For https://github.com/overleaf/issues/issues/4503#issuecomment-873961735
+
+#### Fork base
+
+Based on v2.2.228 (d7afb74a6e1980da5041f376e7a7c7caef5f42ea)
+
+#### Changes:
+
+- fix handling of fetch errors (9826c6eb1ecd501ac3eb1e9d9a98a3e6edde3fd0)
+- do not bundle NodeJS stream backend (6d118ec35e6e6f954938a485178748f1bb8bdd8a)
+
+#### Reproducing of artifacts
+
+- NodeJS v10.23.3 in docker
+- npm v6.14.11 in docker
+- `pdf.js$ npm ci`
+- `pdf.js$ npx gulp generic`
+- `pdf.js$ cp build/generic/build/pdf.* build/generic/LICENSE HERE/build`
+
+#### Testing
+
+PDF.JS does not properly handle network errors for range requests. Any of the initial probe request or following chunk requests can get the editor stuck.
+
+Once any of the requests has failed, the current pdf.js document is stuck and it's (loading) promise never resolves/rejects. This is in turn breaking the frontend cleanup ahead of switching the pdf. New successful compiles will get queued on top of the stuck promise.
+
+https://github.com/overleaf/web-internal/blob/9ed96cd93d3c4d3b23ff223c658ce80bc895484a/frontend/js/ide/pdfng/directives/pdfRenderer.js#L549-L552
+
+https://github.com/overleaf/web-internal/blob/9ed96cd93d3c4d3b23ff223c658ce80bc895484a/frontend/js/ide/pdfng/directives/pdfViewer.js#L46-L47
+
+Steps to reproduce:
+
+### old (and new) logs ui
+
+- set network speed to something very slow (the chrome dev-tools allow custom profiles, set 1kb/s up/down and 1s latency)
+- wait for the compile response to arrive (see new pending requests for log/pdf)
+- trigger a clear cache in another browser tab
+- resume fast network speed
+
+### new logs ui
+
+- open dropdown of (re-)compile button
+- set network speed to something very slow
+- wait for the compile response to arrive (see new pending requests for log/pdf)
+- click re-compile from scratch (which shifts over the stop compile open of the dropdown)
+- resume fast network speed
+
+Alternative reproduction steps involving hacking the ssl-proxy:
+
+- https://digital-science.slack.com/archives/C0216GDEG9L/p1625240302143900
+- https://digital-science.slack.com/archives/C0216GDEG9L/p1625238107141300

services/web/frontend/js/vendor/libs/pdfjs-dist/build/LICENSE

@@ -0,0 +1,177 @@
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services/web/frontend/js/vendor/libs/pdfjs-dist/patches/0001-misc-fix-handling-of-fetch-errors-backport.patch

@@ -0,0 +1,67 @@
+From 9826c6eb1ecd501ac3eb1e9d9a98a3e6edde3fd0 Mon Sep 17 00:00:00 2001
+From: Jakob Ackermann <jakob.ackermann@overleaf.com>
+Date: Mon, 5 Jul 2021 16:23:18 +0100
+Subject: [PATCH] [misc] fix handling of fetch errors (backport)
+
+Testing:
+- delete the pdf file while the initial request is inflight
+- delete the pdf file after the initial request has finished
+---
+ src/core/chunked_stream.js  | 8 +++-----
+ src/display/fetch_stream.js | 2 +-
+ 2 files changed, 4 insertions(+), 6 deletions(-)
+
+diff --git a/src/core/chunked_stream.js b/src/core/chunked_stream.js
+index 26a93f673..ab39037c1 100644
+--- a/src/core/chunked_stream.js
++++ b/src/core/chunked_stream.js
+@@ -307,7 +307,7 @@ class ChunkedStreamManager {
+     }
+ 
+     let chunks = [], loaded = 0;
+-    const promise = new Promise((resolve, reject) => {
++    return new Promise((resolve, reject) => {
+       const readChunk = (chunk) => {
+         try {
+           if (!chunk.done) {
+@@ -328,14 +328,12 @@ class ChunkedStreamManager {
+         }
+       };
+       rangeReader.read().then(readChunk, reject);
+-    });
+-    promise.then((data) => {
++    }).then((data) => {
+       if (this.aborted) {
+         return; // Ignoring any data after abort.
+       }
+       this.onReceiveData({ chunk: data, begin, });
+     });
+-    // TODO check errors
+   }
+ 
+   /**
+@@ -384,7 +382,7 @@ class ChunkedStreamManager {
+     for (const groupedChunk of groupedChunksToRequest) {
+       const begin = groupedChunk.beginChunk * this.chunkSize;
+       const end = Math.min(groupedChunk.endChunk * this.chunkSize, this.length);
+-      this.sendRequest(begin, end);
++      this.sendRequest(begin, end).catch(capability.reject);
+     }
+ 
+     return capability.promise;
+diff --git a/src/display/fetch_stream.js b/src/display/fetch_stream.js
+index f70ed1d54..e736c9494 100644
+--- a/src/display/fetch_stream.js
++++ b/src/display/fetch_stream.js
+@@ -222,7 +222,7 @@ class PDFFetchStreamRangeReader {
+       }
+       this._readCapability.resolve();
+       this._reader = response.body.getReader();
+-    });
++    }).catch(this._readCapability.reject);
+ 
+     this.onProgress = null;
+   }
+-- 
+2.17.1
+

services/web/frontend/js/vendor/libs/pdfjs-dist/patches/0002-misc-do-not-bundle-NodeJS-stream-backend.patch

@@ -0,0 +1,30 @@
+From 6d118ec35e6e6f954938a485178748f1bb8bdd8a Mon Sep 17 00:00:00 2001
+From: Jakob Ackermann <jakob.ackermann@overleaf.com>
+Date: Mon, 5 Jul 2021 17:28:00 +0100
+Subject: [PATCH 2/2] [misc] do not bundle NodeJS stream backend
+
+---
+ src/pdf.js | 7 +------
+ 1 file changed, 1 insertion(+), 6 deletions(-)
+
+diff --git a/src/pdf.js b/src/pdf.js
+index 4ccf2c1a7..7058c7a46 100644
+--- a/src/pdf.js
++++ b/src/pdf.js
+@@ -32,12 +32,7 @@ let pdfjsDisplayAPICompatibility = require('./display/api_compatibility.js');
+ 
+ if (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {
+   const isNodeJS = require('./shared/is_node.js');
+-  if (isNodeJS()) {
+-    let PDFNodeStream = require('./display/node_stream.js').PDFNodeStream;
+-    pdfjsDisplayAPI.setPDFNetworkStreamFactory((params) => {
+-      return new PDFNodeStream(params);
+-    });
+-  } else {
++  if (!isNodeJS()) {
+     let PDFNetworkStream = require('./display/network.js').PDFNetworkStream;
+     let PDFFetchStream;
+     if (pdfjsDisplayDisplayUtils.isFetchSupported()) {
+-- 
+2.17.1
+