feat: generate config file

8 files changed, 900 insertions, 3 deletions

diff --git a/.gitignore b/.gitignore
index e3dc09e..bdf118e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /target
 /docs/book/book
+warden.toml
diff --git a/Cargo.lock b/Cargo.lock
index bfa7b82..0d0c44a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3,5 +3,600 @@
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+checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
+
+[[package]]
+name = "windows-sys"
+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "winnow"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a90e88e4667264a994d34e6d1ab2d26d398dcdca8b7f52bec8668957517fc7d8"
diff --git a/Cargo.toml b/Cargo.toml
index 0bb4411..024a6a6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,9 +1,13 @@
 [workspace]
 resolver = "3"
-members = [ "warden" ]
+members = ["warden"]
 
 [workspace.package]
 license = "AGPL-3.0-only"
 readme = "README.md"
 documentation = "https://books.kanjala.com/warden"
 homepage = "https://git.kanjala.com/warden"
+
+[workspace.dependencies]
+serde = "1.0.228"
+tracing = "0.1.44"
diff --git a/warden/Cargo.toml b/warden/Cargo.toml
index 4fa8c3a..f3255e7 100644
--- a/warden/Cargo.toml
+++ b/warden/Cargo.toml
@@ -7,3 +7,14 @@ documentation.workspace = true
 homepage.workspace = true
 
 [dependencies]
+anyhow = "1.0.102"
+clap = { version = "4.6.0", features = ["derive", "env"] }
+serde = { workspace = true, features = ["derive"] }
+toml = "1.1.0"
+tracing.workspace = true
+tracing-appender = "0.2.4"
+tracing-subscriber = { version = "0.3.23", features = ["env-filter"] }
+
+[dependencies.tokio]
+version = "1.50.0"
+features = ["macros", "rt", "rt-multi-thread"]
diff --git a/warden/src/config/cli/mod.rs b/warden/src/config/cli/mod.rs
new file mode 100644
index 0000000..aa98ca8
--- /dev/null
+++ b/warden/src/config/cli/mod.rs
@@ -0,0 +1,68 @@
+use std::path::PathBuf;
+
+use clap::{Parser, Subcommand, ValueEnum};
+use serde::{Deserialize, Serialize};
+
+#[derive(Parser, Serialize, Deserialize, Default, Debug)]
+#[command(version, about, long_about = None)]
+/// Real-time transaction monitoring
+pub struct Cli {
+    /// Sets a custom config file
+    #[arg(short, long, value_name = "FILE")]
+    #[serde(skip)]
+    pub config: Option<PathBuf>,
+
+    #[command(flatten)]
+    pub server: Server,
+    #[command(subcommand)]
+    #[serde(skip)]
+    pub command: Option<Commands>,
+}
+
+#[derive(Subcommand, Debug)]
+pub enum Commands {
+    /// Generates a default configuration file
+    Init {
+        /// Path to save the config
+        #[arg(short, long, default_value = "warden.toml")]
+        path: String,
+    },
+}
+
+#[derive(Parser, Deserialize, Serialize, Debug)]
+#[serde(rename_all = "kebab-case")]
+pub struct Server {
+    /// Sets the port that the server listens to
+    #[arg(short, long, value_name = "PORT", env = "PORT", default_value = "2210")]
+    #[arg(value_parser = clap::value_parser!(u16).range(1..=65535))]
+    pub port: Option<u16>,
+    /// Runtime environment
+    #[arg(short, long, value_name = "ENV", default_value = "prod")]
+    pub environment: Option<CliEnvironment>,
+    /// Log Level
+    #[arg(short, long, value_name = "LOG_LEVEL")]
+    pub log_level: Option<String>,
+}
+
+impl Default for Server {
+    fn default() -> Self {
+        Self {
+            port: Some(2210),
+            environment: Default::default(),
+            log_level: Some(format!(
+                "{}=debug,tower_http=debug,axum::rejection=trace",
+                env!("CARGO_CRATE_NAME")
+            )),
+        }
+    }
+}
+
+#[derive(Deserialize, ValueEnum, Serialize, Clone, Copy, Default, Debug)]
+#[serde(rename_all = "lowercase")]
+pub enum CliEnvironment {
+    #[default]
+    Dev,
+    Development,
+    Prod,
+    Production,
+}
diff --git a/warden/src/config/log_level.rs b/warden/src/config/log_level.rs
new file mode 100644
index 0000000..3edfbc3
--- /dev/null
+++ b/warden/src/config/log_level.rs
@@ -0,0 +1,68 @@
+use clap::ValueEnum;
+use serde::Deserialize;
+
+#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, ValueEnum, Debug, Default, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum LogLevel {
+    /// The "trace" level.
+    ///
+    /// Designates very low priority, often extremely verbose, information.
+    Trace = 0,
+    /// The "debug" level.
+    ///
+    /// Designates lower priority information.
+    #[default]
+    Debug = 1,
+    /// The "info" level.
+    ///
+    /// Designates useful information.
+    Info = 2,
+    /// The "warn" level.
+    ///
+    /// Designates hazardous situations.
+    Warn = 3,
+    /// The "error" level.
+    ///
+    /// Designates very serious errors.
+    Error = 4,
+}
+
+impl From<LogLevel> for tracing::Level {
+    fn from(value: LogLevel) -> Self {
+        match value {
+            LogLevel::Trace => tracing::Level::TRACE,
+            LogLevel::Debug => tracing::Level::DEBUG,
+            LogLevel::Info => tracing::Level::INFO,
+            LogLevel::Warn => tracing::Level::WARN,
+            LogLevel::Error => tracing::Level::ERROR,
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::LogLevel;
+
+    fn check(level: LogLevel, value: &str) {
+        let level = tracing::Level::from(level);
+        assert_eq!(level.to_string().to_lowercase(), value);
+    }
+
+    #[test]
+    fn loglevel() {
+        let level = LogLevel::Trace;
+        check(level, "trace");
+
+        let level = LogLevel::Debug;
+        check(level, "debug");
+
+        let level = LogLevel::Info;
+        check(level, "info");
+
+        let level = LogLevel::Warn;
+        check(level, "warn");
+
+        let level = LogLevel::Error;
+        check(level, "error");
+    }
+}
diff --git a/warden/src/config/mod.rs b/warden/src/config/mod.rs
new file mode 100644
index 0000000..b2e5307
--- /dev/null
+++ b/warden/src/config/mod.rs
@@ -0,0 +1,108 @@
+mod cli;
+mod log_level;
+
+use clap::ValueEnum;
+pub use cli::Cli;
+pub use cli::Commands;
+use serde::Deserialize;
+use tracing_subscriber::EnvFilter;
+
+use crate::config::cli::CliEnvironment;
+
+#[derive(Deserialize, Default, Debug, ValueEnum, Clone, Copy)]
+#[serde(rename_all = "lowercase")]
+pub enum Environment {
+    Development,
+    #[default]
+    Production,
+}
+
+impl From<CliEnvironment> for Environment {
+    fn from(value: CliEnvironment) -> Self {
+        match value {
+            CliEnvironment::Dev | CliEnvironment::Development => Self::Development,
+            CliEnvironment::Prod | CliEnvironment::Production => Self::Production,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct Configuration {
+    pub server: Server,
+}
+
+#[derive(Debug, Clone)]
+pub struct Server {
+    pub port: u16,
+    pub environment: Environment,
+    pub log_level: EnvFilter,
+}
+
+impl Default for Server {
+    fn default() -> Self {
+        Self {
+            port: 2210,
+            environment: Default::default(),
+            log_level: tracing_subscriber::EnvFilter::try_from_default_env().unwrap_or_else(|_| {
+                // axum logs rejections from built-in extractors with the `axum::rejection`
+                // target, at `TRACE` level. `axum::rejection=trace` enables showing those events
+                format!(
+                    "{}=debug,tower_http=debug,axum::rejection=trace",
+                    env!("CARGO_CRATE_NAME")
+                )
+                .into()
+            }),
+        }
+    }
+}
+
+impl Configuration {
+    pub fn merge(cli: &Cli, file: &Cli) -> anyhow::Result<Self> {
+        let mut missing = Vec::new();
+        let port = cli.server.port.or(file.server.port);
+
+        if port.is_none() {
+            missing.push("server.port");
+        }
+
+        let log_level = cli
+            .server
+            .log_level
+            .as_ref()
+            .or(file.server.log_level.as_ref())
+            .map(ToOwned::to_owned)
+            .unwrap_or_default();
+
+        tracing_subscriber::EnvFilter::try_from_default_env().unwrap_or_else(|_| {
+            // axum logs rejections from built-in extractors with the `axum::rejection`
+            // target, at `TRACE` level. `axum::rejection=trace` enables showing those events
+            log_level.to_string().into()
+        });
+
+        let environment = cli
+            .server
+            .environment
+            .or(file.server.environment)
+            .unwrap_or_default()
+            .into();
+
+        if !missing.is_empty() {
+            anyhow::bail!(
+                "Missing required configuration values:\n{}",
+                missing
+                    .iter()
+                    .map(|f| format!("  - {}", f))
+                    .collect::<Vec<_>>()
+                    .join("\n")
+            );
+        }
+
+        Ok(Self {
+            server: Server {
+                port: port.unwrap(),
+                environment,
+                log_level: log_level.into(),
+            },
+        })
+    }
+}
diff --git a/warden/src/main.rs b/warden/src/main.rs
index e7a11a9..bedc254 100644
--- a/warden/src/main.rs
+++ b/warden/src/main.rs
@@ -1,3 +1,45 @@
-fn main() {
-    println!("Hello, world!");
+use std::io::Write;
+
+use anyhow::Context as _;
+use clap::Parser as _;
+
+use crate::config::Commands;
+
+mod config;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    let cli = config::Cli::parse();
+
+    if let Some(command) = cli.command {
+        return check_subcommand(command);
+    }
+
+    let config = if let Some(file) = cli.config.as_ref() {
+        let contents = std::fs::read_to_string(file)
+            .with_context(|| format!("Failed to read config file: {file:?}"))?;
+        toml::from_str(&contents)?
+    } else {
+        config::Cli::default()
+    };
+    dbg!(config);
+
+    Ok(())
+}
+
+fn check_subcommand(command: Commands) -> anyhow::Result<()> {
+    match command {
+        Commands::Init { path } => {
+            let default_config = config::Cli::default();
+            let mut file = std::fs::OpenOptions::new()
+                .write(true)
+                .create_new(true)
+                .open(&path)?;
+            let str = toml::to_string_pretty(&default_config)?;
+            let _ = file.write_all(str.as_bytes());
+            println!("configuration file saved to {path}");
+        }
+    }
+
+    Ok(())
 }