log: mw_log implementation

- Replacement for `log` crate.
- Additional common types implementation.
- Selectable safety level features.
- Unit tests.

Author: arkjedrz

.github/workflows/lint_clippy.yml

@@ -58,4 +58,4 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: clippy
-          args: --all-features --all-targets --workspace -- -D warnings
+          args: --all-targets --features qm --workspace -- -D warnings

Cargo.lock

@@ -4,11 +4,18 @@ resolver = "2"
 # Used when executing cargo from project root.
 default-members = [
     "src/containers",
+    "src/log/mw_log",
     "src/log/mw_log_fmt",
     "src/log/mw_log_fmt_macro",
 ]
 # Include tests and examples as a member for IDE support and Bazel builds.
-members = ["src/containers", "src/log/mw_log_fmt", "src/log/mw_log_fmt_macro"]
+members = [
+    "src/containers",
+    "src/log/mw_log",
+    "src/log/mw_log_fmt",
+    "src/log/mw_log_fmt_macro",
+    "examples/log_example",
+]
 
 
 [workspace.package]
@@ -19,6 +26,7 @@ authors = ["S-CORE Contributors"]
 
 
 [workspace.dependencies]
+mw_log = { path = "src/log/mw_log" }
 mw_log_fmt = { path = "src/log/mw_log_fmt" }
 mw_log_fmt_macro = { path = "src/log/mw_log_fmt_macro" }
 

Cargo.toml

@@ -0,0 +1,22 @@
+# *******************************************************************************
+# Copyright (c) 2025 Contributors to the Eclipse Foundation
+#
+# See the NOTICE file(s) distributed with this work for additional
+# information regarding copyright ownership.
+#
+# This program and the accompanying materials are made available under the
+# terms of the Apache License Version 2.0 which is available at
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# SPDX-License-Identifier: Apache-2.0
+# *******************************************************************************
+
+load("@rules_rust//rust:defs.bzl", "rust_binary")
+
+rust_binary(
+    name = "log_example",
+    srcs = glob(["src/**/*.rs"]),
+    deps = [
+        "//src/log/mw_log",
+    ],
+)

examples/log_example/BUILD

@@ -0,0 +1,13 @@
+[package]
+name = "log_example"
+version.workspace = true
+authors.workspace = true
+edition.workspace = true
+
+
+[dependencies]
+mw_log.workspace = true
+
+
+[lints]
+workspace = true

examples/log_example/Cargo.toml

@@ -0,0 +1,109 @@
+//
+// Copyright (c) 2025 Contributors to the Eclipse Foundation
+//
+// See the NOTICE file(s) distributed with this work for additional
+// information regarding copyright ownership.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Apache License Version 2.0 which is available at
+// <https://www.apache.org/licenses/LICENSE-2.0>
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+use core::fmt::Write;
+use mw_log::fmt::{write, Error, FormatSpec, Result as FmtResult, ScoreWrite};
+use mw_log::{Log, Metadata, Record};
+
+struct StringWriter {
+    buffer: String,
+}
+
+impl StringWriter {
+    pub fn new() -> Self {
+        Self { buffer: String::new() }
+    }
+
+    pub fn get(&self) -> &str {
+        self.buffer.as_str()
+    }
+}
+
+impl ScoreWrite for StringWriter {
+    fn write_bool(&mut self, v: &bool, _spec: &FormatSpec) -> FmtResult {
+        write!(self.buffer, "{}", v).map_err(|_| Error)
+    }
+
+    fn write_f32(&mut self, v: &f32, _spec: &FormatSpec) -> FmtResult {
+        write!(self.buffer, "{}", v).map_err(|_| Error)
+    }
+
+    fn write_f64(&mut self, v: &f64, _spec: &FormatSpec) -> FmtResult {
+        write!(self.buffer, "{}", v).map_err(|_| Error)
+    }
+
+    fn write_i8(&mut self, v: &i8, _spec: &FormatSpec) -> FmtResult {
+        write!(self.buffer, "{}", v).map_err(|_| Error)
+    }
+
+    fn write_i16(&mut self, v: &i16, _spec: &FormatSpec) -> FmtResult {
+        write!(self.buffer, "{}", v).map_err(|_| Error)
+    }
+
+    fn write_i32(&mut self, v: &i32, _spec: &FormatSpec) -> FmtResult {
+        write!(self.buffer, "{}", v).map_err(|_| Error)
+    }
+
+    fn write_i64(&mut self, v: &i64, _spec: &FormatSpec) -> FmtResult {
+        write!(self.buffer, "{}", v).map_err(|_| Error)
+    }
+
+    fn write_u8(&mut self, v: &u8, _spec: &FormatSpec) -> FmtResult {
+        write!(self.buffer, "{}", v).map_err(|_| Error)
+    }
+
+    fn write_u16(&mut self, v: &u16, _spec: &FormatSpec) -> FmtResult {
+        write!(self.buffer, "{}", v).map_err(|_| Error)
+    }
+
+    fn write_u32(&mut self, v: &u32, _spec: &FormatSpec) -> FmtResult {
+        write!(self.buffer, "{}", v).map_err(|_| Error)
+    }
+
+    fn write_u64(&mut self, v: &u64, _spec: &FormatSpec) -> FmtResult {
+        write!(self.buffer, "{}", v).map_err(|_| Error)
+    }
+
+    fn write_str(&mut self, v: &str, _spec: &FormatSpec) -> FmtResult {
+        write!(self.buffer, "{}", v).map_err(|_| Error)
+    }
+}
+
+pub struct ExampleLogger;
+
+impl Log for ExampleLogger {
+    fn enabled(&self, _metadata: &Metadata) -> bool {
+        true
+    }
+
+    fn context(&self) -> &str {
+        "EXAMPLE"
+    }
+
+    fn log(&self, record: &Record) {
+        if !self.enabled(record.metadata()) {
+            return;
+        }
+
+        // Create writer and write log data.
+        let mut writer = StringWriter::new();
+        let _ = write(&mut writer, *record.args());
+
+        // Show to stderr.
+        eprintln!("{}", writer.get());
+    }
+
+    fn flush(&self) {
+        // No-op.
+    }
+}

examples/log_example/src/logger.rs

@@ -0,0 +1,36 @@
+//
+// Copyright (c) 2025 Contributors to the Eclipse Foundation
+//
+// See the NOTICE file(s) distributed with this work for additional
+// information regarding copyright ownership.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Apache License Version 2.0 which is available at
+// <https://www.apache.org/licenses/LICENSE-2.0>
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+//! Example app containing basic logger implementation.
+
+mod logger;
+
+use crate::logger::ExampleLogger;
+use mw_log::{debug, error, fatal, info, trace, warn, LevelFilter};
+
+fn main() {
+    // Initialize logger.
+    mw_log::set_max_level(LevelFilter::Info);
+    let result = mw_log::set_logger(&ExampleLogger);
+    if result.is_err() {
+        panic!("unable to set logger")
+    }
+
+    // Example logs.
+    trace!("trace log - hidden!");
+    debug!("debug log - hidden!");
+    info!("info log");
+    warn!("warn log");
+    error!("error log");
+    fatal!("fatal log");
+}

examples/log_example/src/main.rs

@@ -0,0 +1,36 @@
+# *******************************************************************************
+# Copyright (c) 2025 Contributors to the Eclipse Foundation
+#
+# See the NOTICE file(s) distributed with this work for additional
+# information regarding copyright ownership.
+#
+# This program and the accompanying materials are made available under the
+# terms of the Apache License Version 2.0 which is available at
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# SPDX-License-Identifier: Apache-2.0
+# *******************************************************************************
+
+load("@bazel_skylib//rules:common_settings.bzl", "string_flag")
+
+string_flag(
+    name = "safety_level",
+    build_setting_default = "asil_b",
+    values = [
+        "asil_b",
+        "qm",
+    ],
+    visibility = [":__subpackages__"],
+)
+
+config_setting(
+    name = "safety_level_qm",
+    flag_values = {":safety_level": "qm"},
+    visibility = [":__subpackages__"],
+)
+
+config_setting(
+    name = "safety_level_asil_b",
+    flag_values = {":safety_level": "asil_b"},
+    visibility = [":__subpackages__"],
+)

src/log/BUILD

@@ -0,0 +1,34 @@
+# *******************************************************************************
+# Copyright (c) 2025 Contributors to the Eclipse Foundation
+#
+# See the NOTICE file(s) distributed with this work for additional
+# information regarding copyright ownership.
+#
+# This program and the accompanying materials are made available under the
+# terms of the Apache License Version 2.0 which is available at
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# SPDX-License-Identifier: Apache-2.0
+# *******************************************************************************
+load("@rules_rust//rust:defs.bzl", "rust_library", "rust_test")
+
+rust_library(
+    name = "mw_log",
+    srcs = glob(["**/*.rs"]),
+    proc_macro_deps = [
+        "//src/log/mw_log_fmt_macro",
+    ],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//src/log/mw_log_fmt",
+    ],
+)
+
+rust_test(
+    name = "tests",
+    crate = "mw_log",
+    tags = [
+        "unit_tests",
+        "ut",
+    ],
+)

src/log/mw_log/BUILD

@@ -0,0 +1,37 @@
+[package]
+name = "mw_log"
+version.workspace = true
+authors.workspace = true
+readme.workspace = true
+edition.workspace = true
+
+
+[lib]
+path = "lib.rs"
+
+
+[features]
+max_level_off = []
+max_level_fatal = []
+max_level_error = []
+max_level_warn = []
+max_level_info = []
+max_level_debug = []
+max_level_trace = []
+
+release_max_level_off = []
+release_max_level_fatal = []
+release_max_level_error = []
+release_max_level_warn = []
+release_max_level_info = []
+release_max_level_debug = []
+release_max_level_trace = []
+
+
+[dependencies]
+mw_log_fmt.workspace = true
+mw_log_fmt_macro.workspace = true
+
+
+[lints]
+workspace = true