Implement pipeline logging with bounded channels and orchestrator integration

tooling/pipeline/includes/services/logging/log_consumer.h

@@ -0,0 +1,44 @@
+/**
+ * @file services/logging/log_consumer.h
+ * @brief Dedicated log drain worker for the pipeline logging channel.
+ *
+ * LogConsumer runs on its own thread, draining LogEntry items from a
+ * BoundedChannel<LogEntry> and forwarding them to spdlog. Exits cleanly
+ * when the channel is closed.
+ */
+
+#ifndef BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_LOG_CONSUMER_H_
+#define BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_LOG_CONSUMER_H_
+
+#include <spdlog/spdlog.h>
+
+#include <string>
+
+#include "concurrency/bounded_channel.h"
+#include "services/logging/log_entry.h"
+
+class LogConsumer {
+ public:
+  explicit LogConsumer(BoundedChannel<LogEntry>& channel);
+
+  LogConsumer(const LogConsumer&) = delete;
+  LogConsumer& operator=(const LogConsumer&) = delete;
+  LogConsumer(LogConsumer&&) = delete;
+  LogConsumer& operator=(LogConsumer&&) = delete;
+
+  /**
+   * @brief Drains the channel until it is closed.
+   *
+   * Intended to be run on a dedicated std::thread. Exits when:
+   *   - The channel is closed and the queue is fully drained.
+   */
+  void Run();
+
+ private:
+  BoundedChannel<LogEntry>& channel_;
+
+  static spdlog::level::level_enum ToSpdlogLevel(LogLevel level);
+  static std::string ToString(PipelinePhase phase);
+};
+
+#endif  // BIERGARTEN_PIPELINE_INCLUDES_SERVICES_LOGGING_LOG_CONSUMER_H_