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Don't add heap allocations while debugging the heap

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This commit is contained in:
Ben Meadors 2025-09-05 07:18:03 -05:00
parent 3df3c876cc
commit bf51c38975
1 changed files with 24 additions and 11 deletions
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35
src/Power.cpp
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@ -833,16 +833,25 @@ void Power::readPowerStatus()
newStatus.notifyObservers(&powerStatus2);
#ifdef DEBUG_HEAP
if (lastheap != memGet.getFreeHeap()) {
std::string threadlist = "Threads running:";
// Use stack-allocated buffer to avoid heap allocations in monitoring code
char threadlist[256] = "Threads running:";
int threadlistLen = strlen(threadlist);
int running = 0;
for (int i = 0; i < MAX_THREADS; i++) {
auto thread = concurrency::mainController.get(i);
if ((thread != nullptr) && (thread->enabled)) {
threadlist += vformat(" %s", thread->ThreadName.c_str());
// Use snprintf to safely append to stack buffer without heap allocation
int remaining = sizeof(threadlist) - threadlistLen - 1;
if (remaining > 0) {
int written = snprintf(threadlist + threadlistLen, remaining, " %s", thread->ThreadName.c_str());
if (written > 0 && written < remaining) {
threadlistLen += written;
}
}
running++;
}
}
LOG_DEBUG(threadlist.c_str());
LOG_DEBUG(threadlist);
LOG_DEBUG("Heap status: %d/%d bytes free (%d), running %d/%d threads", memGet.getFreeHeap(), memGet.getHeapSize(),
memGet.getFreeHeap() - lastheap, running, concurrency::mainController.size(false));
lastheap = memGet.getFreeHeap();
@ -856,15 +865,19 @@ void Power::readPowerStatus()
sprintf(mac, "!%02x%02x%02x%02x", dmac[2], dmac[3], dmac[4], dmac[5]);
auto newHeap = memGet.getFreeHeap();
std::string heapTopic =
(*moduleConfig.mqtt.root ? moduleConfig.mqtt.root : "msh") + std::string("/2/heap/") + std::string(mac);
std::string heapString = std::to_string(newHeap);
mqtt->pubSub.publish(heapTopic.c_str(), heapString.c_str(), false);
// Use stack-allocated buffers to avoid heap allocations in monitoring code
char heapTopic[128];
snprintf(heapTopic, sizeof(heapTopic), "%s/2/heap/%s", (*moduleConfig.mqtt.root ? moduleConfig.mqtt.root : "msh"), mac);
char heapString[16];
snprintf(heapString, sizeof(heapString), "%u", newHeap);
mqtt->pubSub.publish(heapTopic, heapString, false);
auto wifiRSSI = WiFi.RSSI();
std::string wifiTopic =
(*moduleConfig.mqtt.root ? moduleConfig.mqtt.root : "msh") + std::string("/2/wifi/") + std::string(mac);
std::string wifiString = std::to_string(wifiRSSI);
mqtt->pubSub.publish(wifiTopic.c_str(), wifiString.c_str(), false);
char wifiTopic[128];
snprintf(wifiTopic, sizeof(wifiTopic), "%s/2/wifi/%s", (*moduleConfig.mqtt.root ? moduleConfig.mqtt.root : "msh"), mac);
char wifiString[16];
snprintf(wifiString, sizeof(wifiString), "%d", wifiRSSI);
mqtt->pubSub.publish(wifiTopic, wifiString, false);
}
#endif