0036859: Optimization of Graphviz calls

ID	Project	Category	View Status	Date Submitted	Last Update
0036859	mantisbt	code cleanup	public	2026-01-29 11:27	2026-01-29 15:07

Reporter	raspopov	Assigned To
Priority	normal	Severity	minor	Reproducibility	always
Status	new	Resolution	open
Product Version	2.28.0

Summary	0036859: Optimization of Graphviz calls
Description	After testing Graphviz for issue 0036855, I realized that the old code unnecessarily creates a temporary file for each utility call. It also ignores warnings issued by the utilities, even if they have worked successfully. This complicates Graphviz's configuration in the system.
Tags	No tags attached.

raspopov 2026-01-29 11:39 reporter ~0070744	PR: https://github.com/mantisbt/mantisbt/pull/2175 Now, for example, if you specify an unavailable font (e.g. `$g_relationship_graph_fontname = 'Foobar';`), a warning will be displayed. foobar-font-warning.png (33,534 bytes) foobar-font-warning.png (33,534 bytes)

raspopov 2026-01-29 14:32 reporter ~0070746	I have some doubts. I've read about the challenges of running external utilities correctly and without deadlocks in PHP, especially if they use stderr and output a lot of data to stdout. Perhaps we should delegate this task to Symfony Process (`composer require symfony/process`).

raspopov 2026-01-29 15:07 reporter ~0070747	Alternatively, we can port the rendering of graphs to Viz.js. https://viz-js.com/