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Harden DFTE rendering and placeholder registration to fail safely under stalled and invalid inputs.

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Add regression coverage and docs updates so these edge cases stay stable across board test runs.
This commit is contained in:
alex
2026-04-16 13:48:25 +10:00
parent 416ab74238
commit 73fdd28f74
12 changed files with 262 additions and 38 deletions
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src/DeviceFrameworkTemplateRenderer.cpp
+42 -3
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@@ -704,8 +704,21 @@ DeviceFrameworkTemplateRenderer::RenderOutcome DeviceFrameworkTemplateRenderer::
case RenderingContextType::PLACEHOLDER_DYNAMIC_TEMPLATE:
return makeState(TemplateRenderState::TEXT, true);
case RenderingContextType::PLACEHOLDER_CONDITIONAL:
return makeState(TemplateRenderState::RENDERING_CONTEXT, true);
case RenderingContextType::PLACEHOLDER_CONDITIONAL: {
RenderOutcome outcome = makeState(TemplateRenderState::RENDERING_CONTEXT, true);
outcome.popCount = 1;
RenderingContext* parent = (ctx.renderingDepth > 1) ? ctx.getContext(ctx.renderingDepth - 2) : nullptr;
if (!parent) {
outcome.nextState = TemplateRenderState::COMPLETE;
outcome.repeat = false;
outcome.finished = true;
} else if (parent->type == RenderingContextType::TEMPLATE) {
outcome.nextState = TemplateRenderState::TEXT;
}
return outcome;
}
case RenderingContextType::PLACEHOLDER_ITERATOR:
return processIteratorContext(ctx, currentCtx);
@@ -747,7 +760,16 @@ DeviceFrameworkTemplateRenderer::RenderOutcome DeviceFrameworkTemplateRenderer::
return outcome;
}
size_t totalLength = entry->getLength(entry->data);
size_t totalLength = 0;
if (entry->hasCachedLength) {
totalLength = entry->cachedLength;
} else if (entry->getLength != nullptr) {
totalLength = entry->getLength(entry->data);
} else {
DFTE_LOG_ERROR("Placeholder '" + String(entry->name) + "' missing length getter");
return makeError();
}
if (dataCtx.offset >= totalLength) {
RenderOutcome outcome = makeState(TemplateRenderState::RENDERING_CONTEXT, true);
outcome.popCount = 1;
@@ -799,12 +821,20 @@ size_t DeviceFrameworkTemplateRenderer::renderNextChunk(DeviceFrameworkTemplateC
size_t written = 0;
size_t iterations = 0;
size_t consecutiveNoProgressIterations = 0;
uint8_t* writePtr = buffer;
size_t remaining = maxLen;
while (remaining > 0 && !ctx.isComplete() && !ctx.hasError() && iterations < MAX_ITERATIONS) {
RenderOutcome outcome = renderChunk(ctx, writePtr, remaining);
bool noProgressIteration = (outcome.bytesWritten == 0 && outcome.repeat && !outcome.finished && !outcome.errored);
if (noProgressIteration) {
consecutiveNoProgressIterations++;
} else {
consecutiveNoProgressIterations = 0;
}
written += outcome.bytesWritten;
ctx.totalBytesProcessed += outcome.bytesWritten;
writePtr += outcome.bytesWritten;
@@ -822,6 +852,9 @@ size_t DeviceFrameworkTemplateRenderer::renderNextChunk(DeviceFrameworkTemplateC
if (iterations >= MAX_ITERATIONS) {
DFTE_LOG_WARN("Maximum iterations reached in renderNextChunk");
if (consecutiveNoProgressIterations >= 3 && !ctx.isComplete() && !ctx.hasError()) {
ctx.state = TemplateRenderState::ERROR;
}
}
return written;
@@ -833,6 +866,12 @@ void DeviceFrameworkTemplateRenderer::initializeContext(DeviceFrameworkTemplateC
void DeviceFrameworkTemplateRenderer::initializeContext(DeviceFrameworkTemplateContext& ctx, const char* templateData, bool templateInProgmem) {
ctx.reset();
if (templateData == nullptr) {
DFTE_LOG_ERROR("initializeContext called with null template pointer");
ctx.state = TemplateRenderState::ERROR;
return;
}
// Push initial template context
if (!ctx.pushContext(RenderingContextType::TEMPLATE, "ROOT")) {