feat: add a plugable logging system.

src/iceberg/CMakeLists.txt

@@ -49,7 +49,8 @@ set(ICEBERG_SOURCES
     arrow_c_data_guard_internal.cc
     util/murmurhash3_internal.cc
     util/timepoint.cc
-    util/gzip_internal.cc)
+    util/gzip_internal.cc
+    util/logger.cc)
 
 set(ICEBERG_STATIC_BUILD_INTERFACE_LIBS)
 set(ICEBERG_SHARED_BUILD_INTERFACE_LIBS)

src/iceberg/util/logger.cc

@@ -0,0 +1,135 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#include "iceberg/util/logger.h"
+
+#include <spdlog/sinks/stdout_color_sinks.h>
+#include <spdlog/spdlog.h>
+
+namespace iceberg {
+
+namespace {
+
+/// \brief Convert iceberg LogLevel to spdlog level
+spdlog::level::level_enum ToSpdlogLevel(LogLevel level) {
+  switch (level) {
+    case LogLevel::kTrace:
+      return spdlog::level::trace;
+    case LogLevel::kDebug:
+      return spdlog::level::debug;
+    case LogLevel::kInfo:
+      return spdlog::level::info;
+    case LogLevel::kWarn:
+      return spdlog::level::warn;
+    case LogLevel::kError:
+      return spdlog::level::err;
+    case LogLevel::kCritical:
+      return spdlog::level::critical;
+    case LogLevel::kOff:
+      return spdlog::level::off;
+    default:
+      return spdlog::level::info;
+  }
+}
+
+/**
+ * \brief Convert spdlog level to iceberg LogLevel
+ */
+LogLevel FromSpdlogLevel(spdlog::level::level_enum level) {
+  switch (level) {
+    case spdlog::level::trace:
+      return LogLevel::kTrace;
+    case spdlog::level::debug:
+      return LogLevel::kDebug;
+    case spdlog::level::info:
+      return LogLevel::kInfo;
+    case spdlog::level::warn:
+      return LogLevel::kWarn;
+    case spdlog::level::err:
+      return LogLevel::kError;
+    case spdlog::level::critical:
+      return LogLevel::kCritical;
+    case spdlog::level::off:
+      return LogLevel::kOff;
+    default:
+      return LogLevel::kInfo;
+  }
+}
+
+}  // namespace
+
+// SpdlogLogger implementation
+SpdlogLogger::SpdlogLogger(std::string_view logger_name) {
+  auto spdlog_logger = spdlog::get(std::string(logger_name));
+  if (!spdlog_logger) {
+    spdlog_logger = spdlog::stdout_color_mt(std::string(logger_name));
+  }
+  logger_ = std::static_pointer_cast<void>(spdlog_logger);
+  current_level_ = FromSpdlogLevel(spdlog_logger->level());
+}
+
+SpdlogLogger::SpdlogLogger(std::shared_ptr<void> spdlog_logger)
+    : logger_(std::move(spdlog_logger)) {
+  auto typed_logger = std::static_pointer_cast<spdlog::logger>(logger_);
+  current_level_ = FromSpdlogLevel(typed_logger->level());
+}
+
+bool SpdlogLogger::ShouldLogImpl(LogLevel level) const noexcept {
+  return level >= current_level_;
+}
+
+void SpdlogLogger::LogRawImpl(LogLevel level, const std::string& message) const {
+  auto typed_logger = std::static_pointer_cast<spdlog::logger>(logger_);
+  auto spdlog_level = ToSpdlogLevel(level);
+  typed_logger->log(spdlog_level, message);
+}
+
+void SpdlogLogger::LogWithLocationRawImpl(LogLevel level, const std::string& message,
+                                          const std::source_location& location) const {
+  auto typed_logger = std::static_pointer_cast<spdlog::logger>(logger_);
+  auto spdlog_level = ToSpdlogLevel(level);
+
+  // Add source location information
+  std::string full_message =
+      std::format("[{}:{}:{}] {}", location.file_name(), location.line(),
+                  location.function_name(), message);
+
+  typed_logger->log(spdlog_level, full_message);
+}
+
+void SpdlogLogger::SetLevelImpl(LogLevel level) {
+  current_level_ = level;
+  auto typed_logger = std::static_pointer_cast<spdlog::logger>(logger_);
+  typed_logger->set_level(ToSpdlogLevel(level));
+}
+
+LogLevel SpdlogLogger::GetLevelImpl() const noexcept { return current_level_; }
+
+// LoggerRegistry implementation
+LoggerRegistry& LoggerRegistry::Instance() {
+  static LoggerRegistry instance;
+  return instance;
+}
+
+void LoggerRegistry::InitializeDefault(std::string_view logger_name) {
+  auto spdlog_logger = std::make_shared<SpdlogLogger>(logger_name);
+  SetDefaultLogger(spdlog_logger);
+}
+
+}  // namespace iceberg