ESP32: Conditionally log on services to avoid OOM crashes (#1098)

Also removed new line formatting tidy as it requires a bit of memory which might not be available.


* Use suitably scoped char for log newline stripping

* fix formatting

* Better fix for OOM logging crash

* Limit to ESP32 only

* format changes

esphome/components/logger/logger.cpp

@@ -103,7 +103,17 @@ void HOT Logger::log_message_(int level, const char *tag, int offset) {
   const char *msg = this->tx_buffer_ + offset;
   if (this->baud_rate_ > 0)
     this->hw_serial_->println(msg);
+#ifdef ARDUINO_ARCH_ESP32
+  // Suppress network-logging if memory constrained, but still log to serial
+  // ports. In some configurations (eg BLE enabled) there may be some transient
+  // memory exhaustion, and trying to log when OOM can lead to a crash. Skipping
+  // here usually allows the stack to recover instead.
+  // See issue #1234 for analysis.
+  if (xPortGetFreeHeapSize() > 2048)
+    this->log_callback_.call(level, tag, msg);
+#else
   this->log_callback_.call(level, tag, msg);
+#endif
 }
 
 Logger::Logger(uint32_t baud_rate, size_t tx_buffer_size, UARTSelection uart)

esphome/core/log.cpp

@@ -53,16 +53,6 @@ int HOT esp_idf_log_vprintf_(const char *format, va_list args) {  // NOLINT
   if (log == nullptr)
     return 0;
 
-  size_t len = strlen(format);
-  if (format[len - 1] == '\n') {
-    // Remove trailing newline from format
-    // Use locally stored
-    static std::string FORMAT_COPY;
-    FORMAT_COPY.clear();
-    FORMAT_COPY.insert(0, format, len - 1);
-    format = FORMAT_COPY.c_str();
-  }
-
   log->log_vprintf_(ESPHOME_LOG_LEVEL, "esp-idf", 0, format, args);
 #endif
   return 0;