Add a log backend, update copyrights

.gn

@@ -36,7 +36,7 @@ default_args = {
   # Required for pw_unit_test
   pw_sys_io_BACKEND = "$dir_pw_sys_io_stdio"
   pw_assert_BACKEND = "//src/backends/assert"
-  pw_log_BACKEND = "$dir_pw_log_basic"
+  pw_log_BACKEND = "//src/backends/log"
 
   # TODO: Make sure only unit tests link against this
   pw_build_LINK_DEPS = [

src/backends/assert/public/pw_assert_matter/handler.h

@@ -1,5 +1,5 @@
 /*
- *    Copyright (c) 2020 Project CHIP Authors
+ *    Copyright (c) 2024 Project CHIP Authors
  *    All rights reserved.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");

src/backends/assert/public_overrides/pw_assert_backend/check_backend.h

@@ -1,5 +1,5 @@
 /*
- *    Copyright (c) 2020 Project CHIP Authors
+ *    Copyright (c) 2024 Project CHIP Authors
  *    All rights reserved.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");

src/backends/log/BUILD.gn

@@ -0,0 +1,68 @@
+# Copyright (c) 2024 Project CHIP Authors
+#
+# Licensed 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.
+
+import("//build_overrides/build.gni")
+import("//build_overrides/chip.gni")
+import("//build_overrides/pigweed.gni")
+
+import("$dir_pw_build/facade.gni")
+
+config("public_include_path") {
+  include_dirs = [ "public" ]
+  visibility = [ ":*" ]
+}
+
+config("backend_config") {
+  include_dirs = [ "public_overrides" ]
+  visibility = [ ":*" ]
+}
+
+pw_facade("handler") {
+  backend = "${chip_root}/src/backends/log:log.impl"
+  public_configs = [ ":public_include_path" ]
+  public_deps = [ "$dir_pw_preprocessor" ]
+  public = [ "public/pw_log_matter/log_matter.h" ]
+}
+
+pw_source_set("log") {
+  public_configs = [
+    ":backend_config",
+    ":public_include_path",
+  ]
+  public = [
+    "public/pw_log_matter/log_matter.h",
+  ]
+  public_deps = [ ":handler.facade" ]
+}
+
+# A basic handler backend using pw_sys_io.
+pw_source_set("log.impl") {
+  # Turn off GN check since this target intentionally leaves out deps to avoid
+  # circular dependencies.
+  check_includes = false
+
+  configs = [
+    "$dir_pw_string:public_include_path",
+    "$dir_pw_result:public_include_path",
+  ]
+
+  deps = [
+    ":handler.facade",
+    "$dir_pw_log:config",
+    "$dir_pw_preprocessor",
+    "$dir_pw_string:builder",
+    "${chip_root}/src/lib/support",
+  ]
+  sources = [ ]
+}

src/backends/log/public/pw_log_matter/log_matter.h

@@ -0,0 +1,52 @@
+/*
+ *    Copyright (c) 2024 Project CHIP Authors
+ *    All rights reserved.
+ *
+ *    Licensed 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.
+ */
+#pragma once
+
+#include "lib/support/logging/Constants.h"
+#include <lib/support/logging/TextOnlyLogging.h>
+#include <pw_log/levels.h>
+
+// Pigweed defines more granular logging than CHIP.
+// we match the following:
+//    - Detail == DEBUG
+//    - Progress == INFO
+//    - ERROR = WARN, ERROR, CRITICAL
+
+constexpr chip::Logging::LogCategory PwLogLevelToChipLogCategory(int level)
+{
+    switch (level)
+    {
+    case PW_LOG_LEVEL_DEBUG:
+        return chip::Logging::kLogCategory_Detail;
+    case PW_LOG_LEVEL_INFO:
+        return chip::Logging::kLogCategory_Progress;
+    default:
+        return chip::Logging::kLogCategory_Error;
+    }
+}
+
+#define PW_LOG_DEBUG(...) ChipLogDetail(NotSpecified, __VA_ARGS__)
+#define PW_LOG_INFO(...) ChipLogProgress(NotSpecified, __VA_ARGS__)
+#define PW_LOG_WARN(...) ChipLogError(NotSpecified, __VA_ARGS__)
+#define PW_LOG_ERROR(...) ChipLogError(NotSpecified, __VA_ARGS__)
+#define PW_LOG_CRITICAL(...) ChipLogError(NotSpecified, __VA_ARGS__)
+
+// Log a message with many attributes included.
+//
+// This is the main macro that functions not included above will use
+#define PW_HANDLE_LOG(level, module, flags, message, ...)                                                                          \
+    ChipInternalLogImpl(Application, PwLogLevelToChipLogCategory(level), message, __VA_ARGS__)

src/backends/log/public_overrides/pw_log_backend/log_backend.h

@@ -0,0 +1,20 @@
+/*
+ *    Copyright (c) 2024 Project CHIP Authors
+ *    All rights reserved.
+ *
+ *    Licensed 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.
+ */
+#pragma once
+
+#include "pw_log_matter/log_matter.h"
+