log: Rust-based backend implementation

arkjedrz · arkjedrz · commit d31fb8e08cca · 2025-12-23T11:47:14.000Z
Basic implementation creating a string, printed to stderr.
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -20,14 +20,17 @@ default-members = [
     "src/log/mw_log",
     "src/log/mw_log_fmt",
     "src/log/mw_log_fmt_macro",
+    "src/log/mw_log_subscriber",
 ]
 # Include tests and examples as a member for IDE support and Bazel builds.
 members = [
     "src/containers",
     "src/log/mw_log",
     "src/log/mw_log_fmt",
     "src/log/mw_log_fmt_macro",
-    "examples/log_example",
+    "src/log/mw_log_subscriber",
+    "examples/log_builtin",
+    "examples/log_custom",
 ]
 
 [workspace.package]
@@ -40,6 +43,7 @@ authors = ["S-CORE Contributors"]
 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" }
+mw_log_subscriber = { path = "src/log/mw_log_subscriber" }
 
 [workspace.lints.clippy]
 std_instead_of_core = "warn"
diff --git a/examples/log_builtin/BUILD b/examples/log_builtin/BUILD
@@ -0,0 +1,23 @@
+# *******************************************************************************
+# 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_builtin",
+    srcs = glob(["src/**/*.rs"]),
+    deps = [
+        "//src/log/mw_log",
+        "//src/log/mw_log_subscriber",
+    ],
+)
diff --git a/examples/log_builtin/Cargo.toml b/examples/log_builtin/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "log_builtin"
+version.workspace = true
+authors.workspace = true
+edition.workspace = true
+
+
+[dependencies]
+mw_log.workspace = true
+mw_log_subscriber.workspace = true
+
+
+[lints]
+workspace = true
diff --git a/examples/log_builtin/src/main.rs b/examples/log_builtin/src/main.rs
@@ -0,0 +1,41 @@
+//
+// 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 utilizing built-in backend implementation.
+
+use mw_log::{debug, error, fatal, info, trace, warn, LevelFilter};
+use mw_log_subscriber::MwLoggerBuilder;
+
+fn main() {
+    // Initialize logger.
+    MwLoggerBuilder::new()
+        .context("EXAMPLE")
+        .log_level(LevelFilter::Info)
+        .set_as_default_logger();
+
+    // Example logs.
+    trace!("trace log - hidden!");
+    debug!("debug log - hidden!");
+    info!("info log");
+    warn!("warn log");
+    error!("error log");
+    fatal!("fatal log");
+
+    // Logs with changed context.
+    trace!(context: "CHANGED", "trace log - hidden!");
+    debug!(context: "CHANGED", "debug log - hidden!");
+    info!(context: "CHANGED", "info log");
+    warn!(context: "CHANGED", "warn log");
+    error!(context: "CHANGED", "error log");
+    fatal!(context: "CHANGED", "fatal log");
+}
diff --git a/examples/log_custom/BUILD b/examples/log_custom/BUILD
@@ -14,7 +14,7 @@
 load("@rules_rust//rust:defs.bzl", "rust_binary")
 
 rust_binary(
-    name = "log_example",
+    name = "log_custom",
     srcs = glob(["src/**/*.rs"]),
     deps = [
         "//src/log/mw_log",
diff --git a/examples/log_custom/Cargo.toml b/examples/log_custom/Cargo.toml
@@ -12,7 +12,7 @@
 # *******************************************************************************
 
 [package]
-name = "log_example"
+name = "log_custom"
 version.workspace = true
 authors.workspace = true
 edition.workspace = true
diff --git a/examples/log_custom/src/logger.rs b/examples/log_custom/src/logger.rs
diff --git a/examples/log_custom/src/main.rs b/examples/log_custom/src/main.rs
diff --git a/src/log/mw_log_subscriber/BUILD b/src/log/mw_log_subscriber/BUILD
@@ -0,0 +1,31 @@
+# *******************************************************************************
+# 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_subscriber",
+    srcs = glob(["**/*.rs"]),
+    visibility = ["//visibility:public"],
+    deps = [
+        "//src/log/mw_log",
+    ],
+)
+
+rust_test(
+    name = "tests",
+    crate = "mw_log_subscriber",
+    tags = [
+        "unit_tests",
+        "ut",
+    ],
+)
diff --git a/src/log/mw_log_subscriber/Cargo.toml b/src/log/mw_log_subscriber/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "mw_log_subscriber"
+version.workspace = true
+authors.workspace = true
+readme.workspace = true
+edition.workspace = true
+
+
+[lib]
+path = "lib.rs"
+
+
+[dependencies]
+mw_log.workspace = true
+
+
+[lints]
+workspace = true
diff --git a/src/log/mw_log_subscriber/lib.rs b/src/log/mw_log_subscriber/lib.rs
