Use plotly insead of graphviz with adjustment with lobster new version by TannazVhdBMWExt · Pull Request #514 · bmw-software-engineering/lobster

TannazVhdBMWExt · 2025-11-17T08:50:17Z

No description provided.

phiwuu · 2025-11-18T10:50:43Z

tests_system/lobster_html_report/data/awesome.html

This file seems to be completely new. Is it a mistake?

SurajBDeore · 2025-11-25T07:24:08Z

README.md


 ```
-$ sudo apt-get install -y graphviz
+$ sudo apt-get install -y plotly


I guess this will fail because Plotly is not an Ubuntu package. Please verify

lobster/tools/core/html_report/BUILD.bazel

SurajBDeore · 2025-11-25T09:23:14Z

lobster/tools/core/html_report/diagram_generator.py

+
+def add_arrow_label(
+    fig: go.Figure, start: Tuple, end: Tuple,
+    ctrl: Optional[Tuple] = None, text: str = "", font_size: int = 11


Can we add the font_size value in the constants?

SurajBDeore · 2025-11-25T09:23:50Z

lobster/tools/core/html_report/diagram_generator.py

+        font={"size": font_size, "color": "black"},
+        align="center",
+        bgcolor="white",
+        opacity=0.85,


Can we add the opacity value in the constants?

SurajBDeore · 2025-11-25T10:17:36Z

tests_system/lobster_html_report/data/custom_data.html

@@ -34,81 +34,12 @@
  height: 24px;
  vertical-align: middle;


We are not using this file anywhere.

SurajBDeore · 2025-11-25T11:21:59Z

tests_system/lobster_html_report/lobster_UI_system_asserter.py

+                html
+            )
+            # Normalize timestamps - replace dynamic timestamps with static placeholder
+            html = re.sub(


Suggestion:
Compile regex patterns at module level it is faster than recompiling on every call

SurajBDeore · 2025-11-25T11:41:58Z

tests_system/lobster_html_report/test_html_content.py

 from tests_system.lobster_html_report.lobster_UI_system_test_case_base import (
    LobsterUISystemTestCaseBase)
-from tests_system.asserter import Asserter
+from tests_system.lobster_html_report.\


Please use the same approach in all files. In the other file you are importing it. like
from tests_system.lobster_html_report.lobster_UI_system_asserter import (
LobsterUIAsserter as Asserter)

SurajBDeore · 2025-11-26T09:09:41Z

tests_system/lobster_html_report/test_input_file.py

+        output = "custom_data_tracing_policy.html"
        input_file = self._data_directory / "custom_data_report.lobster"

-        self.output_dir = self.create_output_directory_and_copy_expected(


This code is not required?

SurajBDeore · 2025-11-26T09:16:14Z

@TannazVhdBMWExt
Some checks are not running please check this. I have reviewed this PR once the checks succeed, I will review it again.

commit 946f102 Author: Tannaz Vahidi (ext.) <Tannaz.Vahidi@partner.bmw.de> Date: Thu Nov 6 18:21:28 2025 +0100 Adjustments to new version of lobster Update unit/system tests and solve merge conflicts commit d3c09e8 Author: Tannaz Vahidi (ext.) <Tannaz.Vahidi@partner.bmw.de> Date: Fri Jul 25 10:43:44 2025 +0200 Add plotly diagram to lobster-html-report Replacing graphviz and dot with plotly.

TannazVhdBMWExt · 2025-12-01T14:53:04Z

requirements.bzl

    "flask": "@flask//:lib",
    "GitPython": "@gitpython//:lib",
-    "kaleido": "@kaleido//:lib",
+    "kaleido": "@kaleido_py3//:lib",


please correct this and use the newer version of kaleido

SurajBDeore · 2025-12-03T07:21:09Z

@TannazVhdBMWExt
If we are not using Graphviz anywhere, then we need to remove it from docs.yaml.

lobster/.github/workflows/docs.yml

Line 51 in fc7f54f

- name: Install graphviz

There are also some SVGs in the documentation folder that are generated by Graphviz. Please check those as well.

tannazVahidiVispiron · 2025-12-05T12:28:17Z

After debugging the reason of hanging the system_tests on windows, we figured it out:

The fact that kaleido can be imported confirms it's installed, but it doesn't prevent the underlying kaleido subprocess from hanging on complex diagrams. This is a known issue with the library.

The multiprocessing code with the timeout is the correct way to handle this

1.Executes the line fig.to_image(format="svg").

2.Launch Subprocess: The plotly library doesn't render the image in your main Python process. Instead, it finds the kaleido executable file that was installed by pip and launches it as a completely separate subprocess. This executable contains its own miniature, built-in Chromium rendering engine.

3.Send Data: Your main Python script serializes your Plotly figure (fig) into a structured JSON format. It then sends this JSON data to the kaleido subprocess through its standard input (stdin).

4.Kaleido Renders: The kaleido subprocess receives the JSON. It uses its internal Chromium engine to render the figure and create the SVG image. This is the critical step where the hang occurs. For complex diagrams, this internal engine can get stuck in a loop or encounter a bug, causing it to stop processing without crashing or sending an error.

5.Python Waits: Back in your main script, the fig.to_image() function is now paused, simply waiting for the kaleido subprocess to send the finished SVG data back through its standard output (stdout).

Why It Hangs Indefinitely
The problem is that your Python process has no insight into what the kaleido subprocess is doing. It's just waiting for data. If the kaleido subprocess gets stuck at Step 4, your Python process will wait forever at Step 5.

This is why a standard try...except block in Python fails to catch the issue—no exception is ever raised in the Python code. The process is just waiting, which is not considered an error.

The multiprocessing solution works because it creates a third process that acts as a "watchdog." It watches the image-generation process and forcefully terminates it if it doesn't finish within the 15-second timeout, preventing your entire application from freezing.

Apply review

Automatically create output directories for all LOBSTER tools to prevent crashes when paths don't exist Issue: SWF-20884

…ibrary-november-nv

SurajBDeore · 2026-02-02T08:01:53Z

@TannazVhdBMWExt

GitHub Actions Workflow NOT Updated
Update API documentation to remove dot_path parameter
The repository still contains .dot files (Are these still used for documentation purposes, or can they be removed?)
I am not able to generate html report locally also not getting any error message

phiwuu · 2026-02-04T10:05:52Z

@TannazVhdBMWExt

GitHub Actions Workflow NOT Updated

Update API documentation to remove dot_path parameter

The repository still contains .dot files (Are these still used for documentation purposes, or can they be removed?)

I am not able to generate html report locally also not getting any error message

Hi @SurajBDeore, thanks for your review.
As a comment to your point nr. 4, you are talking about files like https://github.com/bmw-software-engineering/lobster/blob/312f7a7d7099199092e9470f1d1c57b907b92452/documentation/simple.dot
This file is being used in the documentation, see https://github.com/bmw-software-engineering/lobster/blob/312f7a7d7099199092e9470f1d1c57b907b92452/documentation/simple.svg and

lobster/documentation/user-manual.md

Line 32 in 312f7a7

![Simple Tracing Policy](simple.svg)

Conclusion: These .dot files must remain and are not related to the removal of the dot tool from lobster-html-report.

SurajBDeore · 2026-02-02T07:58:14Z

packages/lobster-core/setup.py

        "PyYAML>=6.0",
        "yamale>=6.0.0",
        "GitPython>=3.1.30",
+        "plotly==5.10.0",


do we need to include kaleido?

yes, I think so

phiwuu · 2026-02-04T10:12:40Z

I was able to generate an HTML report using Linux. I did not test on other OS, though.

SurajBDeore · 2026-02-05T10:29:17Z

I tried generating the HTML report on Windows, but it was not generated. To confirm the issue, I also tried using a different system with this PR, but the HTML report is still not working.

TannazVhdBMWExt force-pushed the feature/lobster-html-report-using-graphviz-library-november-nv branch 2 times, most recently from 387df9a to 90b527e Compare November 17, 2025 14:34

phiwuu force-pushed the feature/lobster-html-report-using-graphviz-library-november-nv branch from 90b527e to 66d76d2 Compare November 18, 2025 10:45

phiwuu reviewed Nov 18, 2025

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TannazVhdBMWExt mentioned this pull request Nov 24, 2025

Add plotly diagram to lobster-html-report #372

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SurajBDeore reviewed Nov 25, 2025

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TannazVhdBMWExt force-pushed the feature/lobster-html-report-using-graphviz-library-november-nv branch 2 times, most recently from e9de4ff to 94e2438 Compare November 26, 2025 14:46

TannazVhdBMWExt force-pushed the feature/lobster-html-report-using-graphviz-library-november-nv branch from 57a63cf to d35520c Compare November 26, 2025 14:48

TannazVhdBMWExt commented Dec 1, 2025

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TannazVhdBMWExt force-pushed the feature/lobster-html-report-using-graphviz-library-november-nv branch 2 times, most recently from 8d874ef to fc7f54f Compare December 2, 2025 09:24

TannazVhdBMWExt force-pushed the feature/lobster-html-report-using-graphviz-library-november-nv branch 2 times, most recently from 37215e2 to 2c86790 Compare December 12, 2025 11:12

TannazVhdBMWExt force-pushed the feature/lobster-html-report-using-graphviz-library-november-nv branch from 839cf88 to 795daf9 Compare January 12, 2026 07:39

Add plotly diagram to lobster-html-report

5470df4

Apply review

TannazVhdBMWExt force-pushed the feature/lobster-html-report-using-graphviz-library-november-nv branch from eaf327e to 5470df4 Compare January 12, 2026 10:00

SurajBDeore and others added 2 commits January 12, 2026 11:16

Automatically create output directories for all LOBSTER tools (#521)

f45f646

Automatically create output directories for all LOBSTER tools to prevent crashes when paths don't exist Issue: SWF-20884

Merge branch 'main' into feature/lobster-html-report-using-graphviz-l…

738853f

…ibrary-november-nv

lint correction

b37f4f1

TannazVhdBMWExt marked this pull request as ready for review January 12, 2026 11:24

TannazVhdBMWExt requested a review from a team as a code owner January 12, 2026 11:24

TannazVhdBMWExt added 2 commits January 19, 2026 09:06

Merge branch 'main' into feature/lobster-html-report-using-graphviz-l…

026a1d9

…ibrary-november-nv

Merge branch 'main' into feature/lobster-html-report-using-graphviz-l…

913886b

…ibrary-november-nv

SurajBDeore reviewed Feb 4, 2026

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