This commit introduces the ability to set and manage log levels on a
per-instance basis when dynamic logging is enabled, while maintaining
backward compatibility with existing logging behaviors.
The existing `otLoggingGetLevel()` and `otLoggingSetLevel()` APIs are
repurposed to manage the "global" log level. They continue to behave
exactly as before in both single-instance and multi-instance
configurations, ensuring that existing users of these APIs do not need
to change their implementations. To provide more granular control, new
APIs `otGetLogLevel()` and `otSetLogLevel()` are added to handle
per-instance log levels.
Specifically, this commit makes the following changes:
- Adds `mLogLevel` to `Instance` to track the instance-specific log
level.
- Renames the global log level static variable to `sGlobalLogLevel` and
introduces `GetGlobalLogLevel()` and `SetGlobalLogLevel()` to manage
it in a multi-instance configuration.
- Updates `otGetLogLevel()` and `otSetLogLevel()` APIs to handle
per-instance log level retrieval and configuration. If a specific
level is not set for an instance, it falls back to the global
log level.
- Adds `mIsLogLevelSet` to distinguish between an explicitly set
instance log level and the global fallback in multi-instance builds.
- Introduces `otPlatLogHandleLogLevelChanged()` platform callback to
notify the platform when an instance-specific log level is updated.
- Updates Nexus tests to use `SetGlobalLogLevel()` instead of the
deprecated instance `SetLogLevel()` method.
Add `SuccessOrQuit()` to check the return `Error` value of
`RoutingManager::SetEnabled()` in `fuzz_*.cpp` source files. This
addresses warnings about ignoring the return value.
Rename all fuzzer source files in `tests/fuzz` from `{name}.cpp` to
`fuzz_{name}.cpp`.
Update the `ot_nexus_test` macro in `tests/fuzz/CMakeLists.txt` to
reflect this change, using `fuzz_{name}.cpp` as the source file while
naming the test `{name}-fuzzer`.
This change improves consistency and makes it easier to distinguish
fuzzer source files from other similarly named files during searches.
Abtin Keshavarzian