Add separate hookable tracing module

.github/.wordlist.txt

@@ -121,6 +121,7 @@ AXXXF
 AYNJV
 babaf
 backend
+backends
 backticks
 backtrace
 BallastConfiguration

src/BUILD.gn

@@ -94,6 +94,7 @@ if (chip_build_tests) {
         "${chip_root}/src/lib/support/tests",
         "${chip_root}/src/protocols/secure_channel/tests",
         "${chip_root}/src/system/tests",
+        "${chip_root}/src/tracing/tests",
         "${chip_root}/src/transport/tests",
       ]
     }

src/tracing/BUILD.gn

@@ -0,0 +1,42 @@
+# Copyright (c) 2023 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")
+
+declare_args() {
+  matter_enable_tracing_support = true
+}
+
+config("tracing_enabled") {
+  defines = [ "MATTER_TRACING_ENABLED" ]
+}
+
+static_library("tracing") {
+  sources = [
+    "backend.h",
+    "log_declares.h",
+    "macros.h",
+    "registry.cpp",
+    "registry.h",
+    "scope.h",
+    "scopes.h",
+  ]
+
+  public_deps = [ "${chip_root}/src/lib/support" ]
+
+  if (matter_enable_tracing_support) {
+    public_configs = [ ":tracing_enabled" ]
+  }
+}

src/tracing/README.md

@@ -0,0 +1,44 @@
+# Matter tracing
+
+This library provides a runtime-configurable tracing and logging infrastructure
+for matter.
+
+## Types of data
+
+### Tracing
+
+Tracing is mostly intended for following execution flow and measuring time spent
+for various operations. They are:
+
+-   _scoped_ where separate begin and end events are emitted _or_
+
+-   _instant_ where a single notable event is emitted, representing a point in
+    time of a notable event
+
+Tracing and instant values are set to know enumeration values at compile time,
+to allow implementation of backends that require compile-time strings for their
+tracing.
+
+### Data Logging
+
+Data logging provides the tracing module the opportunity to report input/output
+data for matter data processing.
+
+The data logging is generally limited in count and covers:
+
+-   _Messages_, specifically sent matter requests and received matter responses
+
+-   _DNSSD_ operations as they are a core component of matter, specifically
+    attempts to discover nodes as well as when a node is discovered or fails
+    discovery.
+
+## Usage
+
+Backends are defined by extending `chip::Tracing::Backend` in `backend.h` and
+registering it via functions in `registry.h`
+
+Actual usage is controlled using `macros.h` (and for convenience `scope.h`
+provides scoped begin/end invocations).
+
+tracing macros can be completely made a `noop` by setting
+``matter_enable_tracing_support=false` when compiling.

src/tracing/backend.h

@@ -0,0 +1,69 @@
+/*
+ *    Copyright (c) 2023 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/IntrusiveList.h>
+#include <tracing/log_declares.h>
+#include <tracing/scopes.h>
+
+namespace chip {
+namespace Tracing {
+
+/// Represents a generic tracing back-end.
+///
+/// Derived from an intrusive list base as multiple
+/// tracing back-ends may exist per application.
+class Backend : public ::chip::IntrusiveListNodeBase<>
+{
+public:
+    virtual ~Backend() = default;
+
+    /// Begin a trace for the specified scope.
+    ///
+    /// Scopes must be completed by a corresponding
+    /// TraceEnd call.
+    virtual void TraceBegin(Scope scope) = 0;
+
+    /// Tracing end assumes completing a previously
+    /// started scope with TraceBegin and nesting is assumed.
+    ///
+    /// Expect scopes like:
+    ///    TraceBegin(Foo)
+    ///      TraceBegin(Bar)
+    ///      TraceEnd(Bar)
+    ///    TraceEnd(Foo)
+    ///
+    /// The following is NOT acceptable:
+    ///    TraceBegin(Foo)
+    ///    TraceBegin(Bar)
+    ///    TraceEnd(Foo)
+    ///    TraceEnd(Bar)
+    virtual void TraceEnd(Scope scope) = 0;
+
+    /// Trace a zero-sized event
+    virtual void TraceInstant(Instant instant) = 0;
+
+    virtual void LogMessageSend(MessageSendInfo &) { TraceInstant(Instant::Log_MessageSend); }
+    virtual void LogMessageReceived(MessageReceiveInfo &) { TraceInstant(Instant::Log_MessageReceived); }
+
+    virtual void LogNodeLookup(NodeLookupInfo &) { TraceInstant(Instant::Log_NodeLookup); }
+    virtual void LogNodeDiscovered(NodeDiscoveredInfo &) { TraceInstant(Instant::Log_NodeDiscovered); }
+    virtual void LogNodeDiscoveryFailed(NodeDiscoveryFailedInfo &) { TraceInstant(Instant::Log_NodeDiscoveryFailed); }
+};
+
+} // namespace Tracing
+} // namespace chip

src/tracing/log_declares.h

@@ -0,0 +1,32 @@
+/*
+ *    Copyright (c) 2023 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
+
+namespace chip {
+namespace Tracing {
+
+// These structures are forward-declared so that tracing itself has no direct dependencies
+// on actual types. This allows tracing to be used anywhere lib/support could be used.
+
+struct MessageSendInfo;
+struct MessageReceiveInfo;
+struct NodeLookupInfo;
+struct NodeDiscoveredInfo;
+struct NodeDiscoveryFailedInfo;
+
+} // namespace Tracing
+} // namespace chip

src/tracing/macros.h

@@ -0,0 +1,84 @@
+/*
+ *
+ *    Copyright (c) 2023 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
+
+#ifndef MATTER_TRACING_ENABLED
+
+#define _MATTER_TRACE_DISABLE                                                                                                      \
+    do                                                                                                                             \
+    {                                                                                                                              \
+    } while (false)
+
+#define MATTER_TRACE_BEGIN(...) _MATTER_TRACE_DISABLE(__VA_ARGS__)
+#define MATTER_TRACE_END(...) _MATTER_TRACE_DISABLE(__VA_ARGS__)
+
+#define MATTER_TRACE_INSTANT(...) _MATTER_TRACE_DISABLE(__VA_ARGS__)
+
+#define MATTER_LOG_MESSAGE_SEND(...) _MATTER_TRACE_DISABLE(__VA_ARGS__)
+#define MATTER_LOG_MESSAGE_RECEIVED(...) _MATTER_TRACE_DISABLE(__VA_ARGS__)
+
+#define MATTER_LOG_NODE_LOOKUP(...) _MATTER_TRACE_DISABLE(__VA_ARGS__)
+#define MATTER_LOG_NODE_DISCOVERED(...) _MATTER_TRACE_DISABLE(__VA_ARGS__)
+#define MATTER_LOG_NODE_DISCOVERY_FAILED(...) _MATTER_TRACE_DISABLE(__VA_ARGS__)
+
+#else // MATTER_TRACING_ENABLED
+
+#include <tracing/log_declares.h>
+#include <tracing/registry.h>
+#include <tracing/scopes.h>
+
+#define MATTER_TRACE_BEGIN(scope) ::chip::Tracing::Internal::Begin(scope)
+#define MATTER_TRACE_END(scope) ::chip::Tracing::Internal::End(scope)
+#define MATTER_TRACE_INSTANT(scope) ::chip::Tracing::Internal::Instant(scope)
+
+#define MATTER_LOG_MESSAGE_SEND(...)                                                                                               \
+    do                                                                                                                             \
+    {                                                                                                                              \
+        ::chip::Tracing::MessageSendInfo _trace_data(__VA_ARGS__);                                                                 \
+        ::chip::Tracing::Internal::LogMessageSend(_trace_data);                                                                    \
+    } while (false)
+
+#define MATTER_LOG_MESSAGE_RECEIVED(...)                                                                                           \
+    do                                                                                                                             \
+    {                                                                                                                              \
+        ::chip::Tracing::MessageReceivedInfo _trace_data(__VA_ARGS__);                                                             \
+        ::chip::Tracing::Internal::LogMessageReceived(_trace_data);                                                                \
+    } while (false)
+
+#define MATTER_LOG_NODE_LOOKUP(...)                                                                                                \
+    do                                                                                                                             \
+    {                                                                                                                              \
+        ::chip::Tracing::NodeLookupInfo _trace_data(__VA_ARGS__);                                                                  \
+        ::chip::Tracing::Internal::LogNodeLookup(_trace_data);                                                                     \
+    } while (false)
+
+#define MATTER_LOG_NODE_DISCOVERED(...)                                                                                            \
+    do                                                                                                                             \
+    {                                                                                                                              \
+        ::chip::Tracing::NodeDiscoveredInfo _trace_data(__VA_ARGS__);                                                              \
+        ::chip::Tracing::Internal::LogNodeDiscovered(_trace_data);                                                                 \
+    } while (false)
+
+#define MATTER_LOG_NODE_DISCOVERY_FAILED(...)                                                                                      \
+    do                                                                                                                             \
+    {                                                                                                                              \
+        ::chip::Tracing::NodeDiscoveryFailedInfo _trace_data(__VA_ARGS__);                                                         \
+        ::chip::Tracing::Internal::LogNodeDiscoveryFailed(_trace_data);                                                            \
+    } while (false)
+
+#endif