Allow to send logs to syslog

Cargo.lock

@@ -7,6 +7,7 @@ name = "acmed"
 version = "0.25.0-dev"
 dependencies = [
  "clap",
+ "syslog-tracing",
  "tokio",
  "tracing",
  "tracing-subscriber",
@@ -268,6 +269,17 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "syslog-tracing"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d349bc2df408b4bf656709a29643641cef7f1795d708f88b105c626a8f64f6e4"
+dependencies = [
+ "libc",
+ "tracing-core",
+ "tracing-subscriber",
+]
+
 [[package]]
 name = "thread_local"
 version = "1.1.8"
@@ -305,6 +317,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e672c95779cf947c5311f83787af4fa8fffd12fb27e4993211a84bdfd9610f9c"
 dependencies = [
  "once_cell",
+ "valuable",
 ]
 
 [[package]]
@@ -331,6 +344,12 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
+[[package]]
+name = "valuable"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "830b7e5d4d90034032940e4ace0d9a9a057e7a45cd94e6c007832e39edb82f6d"
+
 [[package]]
 name = "winapi"
 version = "0.3.9"

Cargo.toml

@@ -23,6 +23,7 @@ ed448 = []
 
 [dependencies]
 clap = { version = "4.5.23", default-features = false, features = ["color", "derive", "help", "std"] }
+syslog-tracing = { version = "0.3.1", default-features = false }
 tokio = { version = "1.42.0", default-features = false, features = ["rt", "rt-multi-thread"] }
 tracing = { version = "0.1.41", default-features = false, features = ["std"] }
 tracing-subscriber = { version = "0.3.19", default-features = false, features = ["ansi", "fmt", "std"] }

src/log.rs

@@ -23,8 +23,17 @@ impl Level {
 }
 
 pub fn init(level: Level, is_syslog: bool) {
-	let subscriber = FmtSubscriber::builder()
-		.with_max_level(level.tracing())
-		.finish();
-	tracing::subscriber::set_global_default(subscriber).expect("setting default subscriber failed");
+	if is_syslog {
+		let identity = std::ffi::CStr::from_bytes_with_nul(crate::APP_IDENTITY).unwrap();
+		let (options, facility) = Default::default();
+		let syslog = syslog_tracing::Syslog::new(identity, options, facility)
+			.expect("building syslog subscriber failed");
+		tracing_subscriber::fmt().with_writer(syslog).init();
+	} else {
+		let subscriber = FmtSubscriber::builder()
+			.with_max_level(level.tracing())
+			.finish();
+		tracing::subscriber::set_global_default(subscriber)
+			.expect("setting default subscriber failed");
+	}
 }

src/main.rs

@@ -3,6 +3,7 @@ mod log;
 
 use clap::Parser;
 
+pub const APP_IDENTITY: &[u8] = b"acmed\0";
 pub const APP_THREAD_NAME: &str = "acmed-runtime";
 pub const DEFAULT_CONFIG_PATH: &str = "/etc/acmed/acmed.toml";
 pub const DEFAULT_LOG_LEVEL: log::Level = log::Level::Warn;