mnemonic-hash-checker: pass config through cli args or env variables

mnemonic-hash-checker/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2021"
 
 [dependencies]
 axum = { version = "0.6.20", features = ["headers", "macros", "tracing"] }
-clap = { version = "4.3.19", features = ["derive"] }
+clap = { version = "4.3.19", features = ["derive", "env"] }
 color-eyre = "0.6.2"
 deadpool-postgres = "0.10.5"
 serde = { version = "1.0.181", features = ["serde_derive"] }

mnemonic-hash-checker/src/main.rs

@@ -1,10 +1,16 @@
 use std::net::SocketAddr;
 use std::sync::Arc;
 
-use axum::{extract::{Path, State}, routing::get, Json, Router};
+use axum::{
+    extract::{Path, State},
+    routing::get,
+    Json, Router,
+};
 
 use color_eyre::eyre::Result;
 
+use clap::Parser;
+
 use deadpool_postgres::{Config, ManagerConfig, Pool, RecyclingMethod, Runtime};
 use tokio_postgres::NoTls;
 
@@ -17,6 +23,27 @@ use tracing_subscriber::prelude::*;
 
 use tracing::{debug, info};
 
+#[derive(Parser)]
+struct CliConfig {
+    #[clap(long, env)]
+    bind_address: Option<SocketAddr>,
+
+    #[clap(long, env, default_value = "postgres")]
+    postgres_dbname: String,
+
+    #[clap(long, env, default_value = "localhost")]
+    postgres_host: String,
+
+    #[clap(long, env)]
+    postgres_password: String,
+
+    #[clap(long, env, default_value = "5432")]
+    postgres_port: u16,
+
+    #[clap(long, env, default_value = "postgres")]
+    postgres_user: String,
+}
+
 fn setup_registry() {
     let envfilter = EnvFilter::builder()
         .with_default_directive(LevelFilter::DEBUG.into())
@@ -61,17 +88,20 @@ async fn main() -> Result<()> {
     setup_registry();
     color_eyre::install()?;
 
-    let addr: SocketAddr = "0.0.0.0:8000".parse()?;
+    let cli_config = CliConfig::parse();
     let mut config = Config::new();
-    config.dbname = Some("postgres".to_string());
+    config.dbname = Some(cli_config.postgres_dbname);
-    config.host = Some("localhost".to_string());
+    config.host = Some(cli_config.postgres_host);
-    config.password = Some("sandwich".to_string());
+    config.password = Some(cli_config.postgres_password);
-    config.port = Some(5432);
+    config.port = Some(cli_config.postgres_port);
-    config.user = Some("postgres".to_string());
+    config.user = Some(cli_config.postgres_user);
     config.manager = Some(ManagerConfig {
         recycling_method: RecyclingMethod::Fast,
     });
     let pool = config.create_pool(Some(Runtime::Tokio1), NoTls)?;
+    let addr = cli_config.bind_address.unwrap_or_else(|| {
+        (std::net::Ipv4Addr::new(127, 0, 0, 1), 8000).into()
+    });
 
     let app = Router::new()
         .route("/check/:hash", get(check_hash_slug))