demo list and page

src/config.rs

@@ -0,0 +1,48 @@
+use crate::Result;
+use config::{Environment, File};
+use serde::Deserialize;
+use sqlx::postgres::PgConnectOptions;
+use sqlx::PgPool;
+use std::net::IpAddr;
+use std::path::PathBuf;
+
+#[derive(Debug, Deserialize)]
+pub struct Config {
+    pub listen: Listen,
+    pub database: DbConfig,
+}
+
+impl Config {
+    pub fn load(path: &str) -> Result<Self> {
+        let s = config::Config::builder()
+            .add_source(File::with_name(path))
+            .add_source(Environment::default().separator("_"))
+            .build()?;
+
+        Ok(s.try_deserialize()?)
+    }
+}
+
+#[derive(Debug, Deserialize)]
+pub struct DbConfig {
+    hostname: String,
+    username: String,
+    password: String,
+}
+
+impl DbConfig {
+    pub async fn connect(&self) -> Result<PgPool> {
+        let opt = PgConnectOptions::new()
+            .host(&self.hostname)
+            .username(&self.username)
+            .password(&self.password);
+        Ok(PgPool::connect_with(opt).await?)
+    }
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(untagged)]
+pub enum Listen {
+    Socket { path: PathBuf },
+    Tcp { address: IpAddr, port: u16 },
+}