add tracing to k2v-client

src/k2v-client/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "k2v-client"
-version = "0.0.2"
+version = "0.0.3"
 authors = ["Trinity Pointard <trinity.pointard@gmail.com>", "Alex Auvolat <alex@adnab.me>"]
 edition = "2018"
 license = "AGPL-3.0"
@@ -24,10 +24,12 @@ tokio = { version = "1.0", default-features = false, features = ["rt", "rt-multi
 # cli deps
 clap = { version = "4.1", optional = true, features = ["derive", "env"] }
 format_table = { workspace = true, optional = true }
+tracing = { version = "0.1", optional = true }
+tracing-subscriber = { version = "0.3", optional = true, features = ["env-filter"] }
 
 
 [features]
-cli = ["clap", "tokio/fs", "tokio/io-std", "format_table"]
+cli = ["clap", "tokio/fs", "tokio/io-std", "tracing", "tracing-subscriber", "format_table"]
 
 [lib]
 path = "lib.rs"

src/k2v-client/bin/k2v-cli.rs

@@ -397,6 +397,15 @@ impl Filter {
 
 #[tokio::main]
 async fn main() -> Result<(), Error> {
+	if std::env::var("RUST_LOG").is_err() {
+		std::env::set_var("RUST_LOG", "warn")
+	}
+
+	tracing_subscriber::fmt()
+		.with_writer(std::io::stderr)
+		.with_env_filter(tracing_subscriber::filter::EnvFilter::from_default_env())
+		.init();
+
 	let args = Args::parse();
 
 	let region = Region::Custom {