Claus Ibsen created CAMEL-23631:
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Summary: Route diagram - highlight error path from ErrorRegistry
message history
Key: CAMEL-23631
URL: https://issues.apache.org/jira/browse/CAMEL-23631
Project: Camel
Issue Type: Improvement
Components: camel-diagram
Reporter: Claus Ibsen
The ErrorRegistry captures rich error snapshots including message history — the
sequence of route nodes the exchange visited before the error occurred. Each
history entry contains the routeId and nodeId (e.g., route1[log1] (5 ms)).
The route diagram rendering pipeline (camel-diagram) renders route structures
as PNG images or ASCII/Unicode text, but currently has no concept of
highlighting specific nodes or paths.
This improvement would allow rendering a route diagram where the error path is
highlighted, making it easy to visually trace the exact route the failed
exchange took.
*Implementation approach:*
1. Propagate node ID through the diagram pipeline — add id field to NodeInfo
and LayoutNode, read it in RouteDiagramHelper.parseRoutes()
2. Add Set<String> highlightedNodeIds parameter to both renderers
(RouteDiagramRenderer for PNG, RouteDiagramAsciiRenderer for text)
3. Highlight matching nodes with a distinct visual style (colored border/glow
for PNG, ANSI colors for text)
4. Add CLI support, e.g. camel route-diagram --highlight "from1,log1,to3" or
camel route-diagram --error <uid> to fetch history from a running process
The join key (node ID) already exists in both data sources — the route
structure JSON has code[].id and the error history has routeId[nodeId] — but
the diagram pipeline currently discards the ID during parsing.
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