feat(logging): centralize logging setup in teepot crate

- Added a new logging module in `teepot` crate.
- Removed redundant logging setup code from individual projects.
- Updated dependencies and references for logging setup.

Signed-off-by: Harald Hoyer <harald@matterlabs.dev>

crates/teepot/Cargo.toml

@@ -39,6 +39,8 @@ sha2.workspace = true
 signature.workspace = true
 thiserror.workspace = true
 tracing.workspace = true
+tracing-log.workspace = true
+tracing-subscriber.workspace = true
 webpki-roots.workspace = true
 x509-cert.workspace = true
 zeroize.workspace = true

crates/teepot/src/lib.rs

@@ -11,4 +11,5 @@ pub mod json;
 pub mod server;
 pub mod sgx;
 
+pub mod log;
 pub mod quote;

crates/teepot/src/log/mod.rs

@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright (c) 2024 Matter Labs
+
+//! Logging related stuff
+
+use anyhow::Context;
+use tracing::level_filters::LevelFilter;
+use tracing_log::LogTracer;
+use tracing_subscriber::Registry;
+use tracing_subscriber::{fmt, prelude::*, EnvFilter};
+
+/// A log level parser for clap, with "off", "error", "warn", "info", "debug", "trace" as valid values
+#[derive(Clone)]
+pub struct LogLevelParser;
+
+impl clap::builder::TypedValueParser for LogLevelParser {
+    type Value = LevelFilter;
+
+    fn parse_ref(
+        &self,
+        cmd: &clap::Command,
+        arg: Option<&clap::Arg>,
+        value: &std::ffi::OsStr,
+    ) -> anyhow::Result<Self::Value, clap::Error> {
+        clap::builder::TypedValueParser::parse(self, cmd, arg, value.to_owned())
+    }
+
+    fn parse(
+        &self,
+        cmd: &clap::Command,
+        arg: Option<&clap::Arg>,
+        value: std::ffi::OsString,
+    ) -> std::result::Result<Self::Value, clap::Error> {
+        use std::str::FromStr;
+        let p = clap::builder::PossibleValuesParser::new([
+            "off", "error", "warn", "info", "debug", "trace",
+        ]);
+        let v = p.parse(cmd, arg, value)?;
+
+        Ok(LevelFilter::from_str(&v).unwrap())
+    }
+}
+
+/// Setup standard logging and loglevel for the current crate and the `teepot` crate.
+pub fn setup_logging(log_level: &LevelFilter) -> anyhow::Result<()> {
+    LogTracer::init().context("Failed to set logger")?;
+    let filter = EnvFilter::builder()
+        .try_from_env()
+        .unwrap_or(match *log_level {
+            LevelFilter::OFF => EnvFilter::new("off"),
+            _ => EnvFilter::new(format!(
+                "warn,{crate_name}={log_level},teepot={log_level}",
+                crate_name = env!("CARGO_CRATE_NAME"),
+                log_level = log_level
+            )),
+        });
+    let subscriber = Registry::default()
+        .with(filter)
+        .with(fmt::layer().with_writer(std::io::stderr));
+    tracing::subscriber::set_global_default(subscriber)?;
+
+    Ok(())
+}