Repository: bigbluebutton/bigbluebutton
Pull request #23105: refactor(bbb-web): Add more logging to presentation conversion process
Author: login: paultrudel
Created: 2025-05-05T22:17:26Z | Merged: 2025-05-06T14:58:59Z

### What does this PR do?

Adds more logging to the to presentation conversion processor particularly around the handling page and presentation completion messages. Also adds a thread factory to the conversion message handling executor thread pool to allow restarts if one of the threads fails as well as catching any exceptions that may be thrown in the threads to allow them to continue.

### Motivation

The purpose of these logs is to help track down an issue where presentation conversion status is not being properly communicated with Akka Apps. The issue may be related to the presentation not being found in the collection of presentations to convert. If this is the case the following error will be logged `No presentation found with key`. Another possible explanation of the issue is that the thread handling conversion messages is encountering an exception and being killed so no further messages can be handled.



Diff:
diff --git a/bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PdfSlidesGenerationService.java b/bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PdfSlidesGenerationService.java
index 0db903630d60..bcab440078c0 100755
--- a/bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PdfSlidesGenerationService.java
+++ b/bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PdfSlidesGenerationService.java
@@ -53,9 +53,9 @@ public void process(PageToConvert pageToConvert) {
                 new ArrayList<>());
 
         presentationConversionCompletionService.handle(msg);
-        log.info("Progress message handled for page {}", pageToConvert.getPageNumber());
+        log.info("Progress message handled for page {} of presentation [{}] in meeting [{}]", pageToConvert.getPageNumber(), pageToConvert.getPresId(), pageToConvert.getMeetingId());
       } catch (Throwable t) {
-        log.error("Conversion task failed for page {}", pageToConvert.getPageNumber(), t);
+        log.error("Conversion task failed for page {} of presentation [{}] in meeting [{}]", pageToConvert.getPageNumber(), pageToConvert.getPresId(), pageToConvert.getMeetingId(), t);
       }
     });
   }
diff --git a/bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PresentationConversionCompletionService.java b/bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PresentationConversionCompletionService.java
index 374289bd8c7b..5b87bc9e6fac 100755
--- a/bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PresentationConversionCompletionService.java
+++ b/bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PresentationConversionCompletionService.java
@@ -29,32 +29,51 @@ public class PresentationConversionCompletionService {
     private BlockingQueue<IPresentationCompletionMessage> messages = new LinkedBlockingQueue<IPresentationCompletionMessage>();
 
     public PresentationConversionCompletionService() {
-        executor = Executors.newSingleThreadExecutor();
+        executor = Executors.newSingleThreadExecutor(r -> {
+            Thread t = new Thread(r, "conv-msg-consumer");
+            t.setUncaughtExceptionHandler((thr, ex) ->
+                    log.error("Uncaught exception in {}", thr.getName(), ex)
+            );
+            return t;
+        });
     }
 
     public void handle(IPresentationCompletionMessage msg) {
-        messages.offer(msg);
+        log.info("Enqueueing presentation conversion message");
+        boolean added = messages.offer(msg);
+        if (!added) {
+            log.warn("Conversion message was not added to the queue");
+        }
     }
 
     private void processMessage(IPresentationCompletionMessage msg) {
         if (msg instanceof PresentationConvertMessage) {
+            log.info("Handling PresentationConvertMessage");
             PresentationConvertMessage m = (PresentationConvertMessage) msg;
             PresentationToConvert p = new PresentationToConvert(m.pres);
 
             String presentationToConvertKey = p.getKey() + "_" + m.pres.getMeetingId();
 
+            log.info("Storing presentation with key {}", presentationToConvertKey);
             presentationsToConvert.put(presentationToConvertKey, p);
         } else if (msg instanceof PageConvertProgressMessage) {
+            log.info("Handling PageConvertProgressMessage");
             PageConvertProgressMessage m = (PageConvertProgressMessage) msg;
             String presentationToConvertKey = m.presId + "_" + m.meetingId;
 
             PresentationToConvert p = presentationsToConvert.get(presentationToConvertKey);
             if (p != null) {
+                log.info("Found presentation with key {}", presentationToConvertKey);
                 p.incrementPagesCompleted();
                 notifier.sendConversionUpdateMessage(p.getPagesCompleted(), p.pres, m.page);
+                log.info("{} of {} pages successfully converted for presentation [{}] in meeting [{}]", p.getPagesCompleted(), p.pres.getNumberOfPages(),
+                        ((PageConvertProgressMessage) msg).presId, ((PageConvertProgressMessage) msg).meetingId);
                 if (p.getPagesCompleted() == p.pres.getNumberOfPages()) {
+                    log.info("Last presentation page converted");
                     handleEndProcessing(p);
                 }
+            } else {
+                log.error("No presentation found with key {}", presentationToConvertKey);
             }
         }
     }
@@ -115,22 +134,23 @@ public void start() {
 
         try {
             processProgress = true;
-
-            Runnable messageProcessor = new Runnable() {
-                public void run() {
-                    while (processProgress) {
-                        try {
-                            IPresentationCompletionMessage msg = messages.take();
-                            processMessage(msg);
-                        } catch (InterruptedException e) {
-                            log.warn("Error while taking presentation file from queue.");
-                        }
+            executor.submit(() -> {
+                while (processProgress) {
+                    try {
+                        log.info("Taking next presentation conversion message");
+                        IPresentationCompletionMessage msg = messages.take();
+                        processMessage(msg);
+                    } catch (InterruptedException ie) {
+                        Thread.currentThread().interrupt();
+                        break;
+                    } catch (Throwable t) {
+                        log.error("Conversion message consumer encountered an error but will continue", t);
                     }
                 }
-            };
-            executor.submit(messageProcessor);
+                log.info("Conversion message consumer thread exiting");
+            });
         } catch (Exception e) {
-            log.error("Error processing presentation file: {}", e);
+            log.error("Error processing presentation file:", e);
         }
     }
 
diff --git a/bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/SlidesGenerationProgressNotifier.java b/bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/SlidesGenerationProgressNotifier.java
index 966527109c6a..64c199077330 100755
--- a/bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/SlidesGenerationProgressNotifier.java
+++ b/bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/SlidesGenerationProgressNotifier.java
@@ -101,6 +101,7 @@ public void sendUploadFileScanFailed(UploadedPresentation pres) {
   }
 
   public void sendConversionUpdateMessage(int slidesCompleted, UploadedPresentation pres, int pageGenerated) {
+    log.info("Sending conversion update message for page {} of presentation [{}] in meeting [{}]", pageGenerated, pres.getId(), pres.getMeetingId());
     DocPageGeneratedProgress progress = new DocPageGeneratedProgress(pres.getPodId(),
             pres.getMeetingId(),
             pres.getId(),
@@ -129,6 +130,7 @@ public void sendCreatingThumbnailsUpdateMessage(UploadedPresentation pres) {
   }
 
   public void sendConversionCompletedMessage(UploadedPresentation pres) {
+    log.info("Sending conversion completed message for presentation [{}] in meeting [{}]", pres.getId(), pres.getMeetingId());
     if (generatedSlidesInfoHelper == null) {
       log.error("GeneratedSlidesInfoHelper was not set. Could not notify interested listeners.");
       return;


Reviews:
user: login: coderabbitai[bot]
body: **Actionable comments posted: 1**

<details>
<summary>🧹 Nitpick comments (6)</summary><blockquote>

<details>
<summary>bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/SlidesGenerationProgressNotifier.java (2)</summary><blockquote>

`104-104`: **Review log level for frequent conversion update messages**  
Logging an info-level message every time a slide page is generated may flood the logs under high load. Consider demoting this to debug or wrapping with `if (log.isDebugEnabled())` to reduce verbosity.  


Proposed diff:
```diff
- log.info("Sending conversion update message for page {} of presentation [{}] in meeting [{}]",
-          pageGenerated, pres.getId(), pres.getMeetingId());
+ log.debug("Sending conversion update message for page {} of presentation [{}] in meeting [{}]",
+           pageGenerated, pres.getId(), pres.getMeetingId());
```

---

`133-133`: **Enrich completion log with slide count and base URL**  
The completion log currently only shows the presentation and meeting IDs. It would be more actionable if it also included the total number of pages and the generated base URL.  


Proposed diff:
```diff
- log.info("Sending conversion completed message for presentation [{}] in meeting [{}]",
-          pres.getId(), pres.getMeetingId());
+ log.info("Completed conversion of {} pages for presentation [{}] in meeting [{}], base URL: {}",
+          pres.getNumberOfPages(), pres.getId(), pres.getMeetingId(), generateBasePresUrl(pres));
```

</blockquote></details>
<details>
<summary>bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PresentationConversionCompletionService.java (4)</summary><blockquote>

`36-37`: **Include message details when enqueueing**  
Currently the enqueue log only states that a message was enqueued. For better traceability, include the message type and key or identifiers (e.g., presentation ID, page number).  


Example diff:
```diff
- log.info("Enqueueing presentation conversion message");
+ log.info("Enqueueing {} for presentation/page message: {}", msg.getClass().getSimpleName(), msg);
```

---

`42-49`: **Enhance PresentationConvertMessage handling logs**  
The logs for handling a `PresentationConvertMessage` lack context about which presentation is being processed. Include the presentation ID and meeting ID to make these entries actionable.  


Proposed diff:
```diff
- log.info("Handling PresentationConvertMessage");
+ log.info("Handling PresentationConvertMessage for presentation [{}] in meeting [{}]",
+          m.pres.getId(), m.pres.getMeetingId());

- log.info("Storing presentation with key {}", presentationToConvertKey);
+ log.info("Stored PresentationToConvert under key {} for presentation [{}] in meeting [{}]",
+          presentationToConvertKey, m.pres.getId(), m.pres.getMeetingId());
```

---

`51-67`: **Enrich `PageConvertProgressMessage` processing logs**  
The messages within the `PageConvertProgressMessage` branch should carry more context. Suggest including the page number, presentation ID, and meeting ID in the initial handling log, and clarifying the error path when no presentation is found.  


Example diff:
```diff
- log.info("Handling PageConvertProgressMessage");
+ log.info("Handling PageConvertProgressMessage for presentation [{}] in meeting [{}], page {}",
+          m.presId, m.meetingId, m.page);

- log.error("No presentation found with key {}", presentationToConvertKey);
+ log.error("No presentation found for key {} (presentation [{}] in meeting [{}])",
+           presentationToConvertKey, m.presId, m.meetingId);
```

---

`132-132`: **Use debug level for queue polling logs**  
Logging an info-level message every time the consumer takes from the queue may overwhelm the logs. Consider changing this to debug to reduce noise.  


Proposed diff:
```diff
- log.info("Taking next presentation conversion message");
+ log.debug("Taking next presentation conversion message");
```

</blockquote></details>

</blockquote></details>

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<summary>📜 Review details</summary>

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<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between e1fb4444c9cb729f6217b30edfaf9eb5d9905fd6 and afc05e75d98ba263db7ff2e10c28bc6b00c5eb07.

</details>

<details>
<summary>📒 Files selected for processing (3)</summary>

* `bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PdfSlidesGenerationService.java` (1 hunks)
* `bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PresentationConversionCompletionService.java` (2 hunks)
* `bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/SlidesGenerationProgressNotifier.java` (2 hunks)

</details>

<details>
<summary>⏰ Context from checks skipped due to timeout of 90000ms (4)</summary>

* GitHub Check: build-package (others)
* GitHub Check: build-package (bbb-web)
* GitHub Check: build-package (bbb-graphql-server)
* GitHub Check: build-package (bbb-playback-record)

</details>

<details>
<summary>🔇 Additional comments (1)</summary><blockquote>

<details>
<summary>bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PdfSlidesGenerationService.java (1)</summary>

`58-58`: **Approve exception logging with context and stack trace**  
Including the page number, presentation ID, meeting ID, and the throwable `t` in the error log provides valuable diagnostic information.

</details>

</blockquote></details>

</details>

<!-- This is an auto-generated comment by CodeRabbit for review status -->
state: COMMENTED
author_association: CONTRIBUTOR
submitted_at: 2025-05-05T22:20:32Z
user: login: ritzalam
state: COMMENTED
author_association: MEMBER
submitted_at: 2025-05-05T22:33:35Z
user: login: ritzalam
state: APPROVED
author_association: MEMBER
submitted_at: 2025-05-06T14:57:06Z

Review comments:
diff_hunk: @@ -53,9 +53,9 @@ public void process(PageToConvert pageToConvert) {
                 new ArrayList<>());
 
         presentationConversionCompletionService.handle(msg);
-        log.info("Progress message handled for page {}", pageToConvert.getPageNumber());
+        log.info("Progress message handled for page {} of presentation [{}] in meeting [{}]", pageToConvert.getPageNumber(), pageToConvert.getPresId(), pageToConvert.getMeetingId());
path: bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PdfSlidesGenerationService.java
user: login: coderabbitai[bot]
body: _🛠️ Refactor suggestion_

**Ensure `presentationConversionCompletionService` is initialized before use**  
Without a null check, calling `presentationConversionCompletionService.handle(msg)` may lead to a NullPointerException if the service wasn't injected or set. Add a guard or requireNonNull to fail fast or skip handling when the service is not configured.  


Proposed diff:
```diff
-        presentationConversionCompletionService.handle(msg);
-        log.info("Progress message handled for page {} of presentation [{}] in meeting [{}]",
-                 pageToConvert.getPageNumber(), pageToConvert.getPresId(), pageToConvert.getMeetingId());
+        if (presentationConversionCompletionService == null) {
+          log.error("PresentationConversionCompletionService not initialized; skipping progress message for page {} of presentation [{}] in meeting [{}]",
+                    pageToConvert.getPageNumber(), pageToConvert.getPresId(), pageToConvert.getMeetingId());
+        } else {
+          presentationConversionCompletionService.handle(msg);
+          log.info("Progress message handled for page {} of presentation [{}] in meeting [{}]",
+                   pageToConvert.getPageNumber(), pageToConvert.getPresId(), pageToConvert.getMeetingId());
+        }
```


<!-- suggestion_start -->

<details>
<summary>📝 Committable suggestion</summary>

> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

`````suggestion
        if (presentationConversionCompletionService == null) {
          log.error("PresentationConversionCompletionService not initialized; skipping progress message for page {} of presentation [{}] in meeting [{}]",
                    pageToConvert.getPageNumber(), pageToConvert.getPresId(), pageToConvert.getMeetingId());
        } else {
          presentationConversionCompletionService.handle(msg);
          log.info("Progress message handled for page {} of presentation [{}] in meeting [{}]",
                   pageToConvert.getPageNumber(), pageToConvert.getPresId(), pageToConvert.getMeetingId());
        }
`````

</details>

<!-- suggestion_end -->

<!-- This is an auto-generated comment by CodeRabbit -->
created_at: 2025-05-05T22:20:32Z
author_association: CONTRIBUTOR
diff_hunk: @@ -33,28 +33,37 @@ public PresentationConversionCompletionService() {
     }
 
     public void handle(IPresentationCompletionMessage msg) {
+        log.info("Enqueueing presentation conversion message");
         messages.offer(msg);
     }
 
     private void processMessage(IPresentationCompletionMessage msg) {
         if (msg instanceof PresentationConvertMessage) {
+            log.info("Handling PresentationConvertMessage");
             PresentationConvertMessage m = (PresentationConvertMessage) msg;
             PresentationToConvert p = new PresentationToConvert(m.pres);
 
             String presentationToConvertKey = p.getKey() + "_" + m.pres.getMeetingId();
 
+            log.info("Storing presentation with key {}", presentationToConvertKey);
             presentationsToConvert.put(presentationToConvertKey, p);
         } else if (msg instanceof PageConvertProgressMessage) {
+            log.info("Handling PageConvertProgressMessage");
             PageConvertProgressMessage m = (PageConvertProgressMessage) msg;
             String presentationToConvertKey = m.presId + "_" + m.meetingId;
 
             PresentationToConvert p = presentationsToConvert.get(presentationToConvertKey);
             if (p != null) {
+                log.info("Found presentation with key {}", presentationToConvertKey);
                 p.incrementPagesCompleted();
                 notifier.sendConversionUpdateMessage(p.getPagesCompleted(), p.pres, m.page);
+                log.info("{} of {} pages successfully converted", p.getPagesCompleted(), p.pres.getNumberOfPages());
path: bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PresentationConversionCompletionService.java
user: login: ritzalam
body: Please add the meetingid and presentatioid here.
created_at: 2025-05-05T22:30:02Z
author_association: MEMBER

PR comments:
user: login: coderabbitai[bot]
created_at: 2025-05-05T22:17:32Z
body: <!-- This is an auto-generated comment: summarize by coderabbit.ai -->
<!-- walkthrough_start -->

## Walkthrough

The changes across the affected files enhance logging statements to provide more detailed contextual information during the presentation conversion and slide generation processes. In `PdfSlidesGenerationService`, log messages now include presentation and meeting IDs alongside existing information. The `PresentationConversionCompletionService` class introduces comprehensive logging at key points, such as message queuing, processing, progress updates, and error conditions, without modifying the underlying logic. In `SlidesGenerationProgressNotifier`, informational logs are added to indicate when conversion update and completion messages are sent, including relevant identifiers. No changes were made to the core logic or public interfaces.

## Sequence Diagram(s)

```mermaid
sequenceDiagram
    participant Client
    participant PdfSlidesGenerationService
    participant SlidesGenerationProgressNotifier
    participant PresentationConversionCompletionService

    Client->>PdfSlidesGenerationService: Start slide generation
    PdfSlidesGenerationService->>SlidesGenerationProgressNotifier: sendConversionUpdateMessage (logs page, presId, meetingId)
    SlidesGenerationProgressNotifier->>PresentationConversionCompletionService: Enqueue progress message (logs enqueue)
    PresentationConversionCompletionService->>PresentationConversionCompletionService: Process message (logs processing, progress, errors)
    PresentationConversionCompletionService->>SlidesGenerationProgressNotifier: sendConversionCompletedMessage (logs presId, meetingId)
```

## Suggested reviewers

- gustavotrott  
- antobinary

<!-- walkthrough_end -->


---

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<summary>📜 Recent review details</summary>

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<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between fcd603bfc76b1171165f114c03bd9606d775d8e9 and 11bf23b378ad8bf5d48d928170e91ab98e492729.

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<details>
<summary>📒 Files selected for processing (1)</summary>

* `bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PresentationConversionCompletionService.java` (2 hunks)

</details>

<details>
<summary>🚧 Files skipped from review as they are similar to previous changes (1)</summary>

* bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/PresentationConversionCompletionService.java

</details>

<details>
<summary>⏰ Context from checks skipped due to timeout of 90000ms (4)</summary>

* GitHub Check: build-package (others)
* GitHub Check: build-package (bbb-web)
* GitHub Check: build-package (bbb-graphql-server)
* GitHub Check: build-package (bbb-playback-record)

</details>

</details>
<!-- internal state start -->


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<!-- finishing_touch_checkbox_start -->

<details open="true">
<summary>✨ Finishing Touches</summary>

- [ ] <!-- {"checkboxId": "7962f53c-55bc-4827-bfbf-6a18da830691"} --> 📝 Generate Docstrings

</details>

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author_association: CONTRIBUTOR
user: login: sonarqubecloud[bot]
created_at: 2025-05-06T14:03:06Z
body: ## [![Quality Gate Passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/qg-passed-20px.png 'Quality Gate Passed')](https://sonarcloud.io/dashboard?id=bigbluebutton_bigbluebutton&pullRequest=23105) **Quality Gate passed**  
Issues  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 New issues](https://sonarcloud.io/project/issues?id=bigbluebutton_bigbluebutton&pullRequest=23105&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/accepted-16px.png '') [0 Accepted issues](https://sonarcloud.io/project/issues?id=bigbluebutton_bigbluebutton&pullRequest=23105&issueStatuses=ACCEPTED)

Measures  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=bigbluebutton_bigbluebutton&pullRequest=23105&issueStatuses=OPEN,CONFIRMED&sinceLeakPeriod=true)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.0% Coverage on New Code](https://sonarcloud.io/component_measures?id=bigbluebutton_bigbluebutton&pullRequest=23105&metric=new_coverage&view=list)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.0% Duplication on New Code](https://sonarcloud.io/component_measures?id=bigbluebutton_bigbluebutton&pullRequest=23105&metric=new_duplicated_lines_density&view=list)  
  
[See analysis details on SonarQube Cloud](https://sonarcloud.io/dashboard?id=bigbluebutton_bigbluebutton&pullRequest=23105)


author_association: NONE
user: login: github-actions[bot]
created_at: 2025-05-06T14:35:23Z
body: <h1>Automated tests Summary</h1>
<h3><strong>:white_check_mark:</strong> All the CI tests have passed!</h3>
author_association: NONE