add toml config support

src/config/toml.rs

@@ -0,0 +1,64 @@
+use crate::error::*;
+use serde::Deserialize;
+use std::{collections::HashMap, fs};
+
+#[derive(Deserialize, Debug, Default)]
+pub struct ConfigToml {
+  pub listen_port: Option<u16>,
+  pub listen_port_tls: Option<u16>,
+  pub apps: Option<Apps>,
+}
+
+#[derive(Deserialize, Debug, Default)]
+pub struct Apps(pub HashMap<String, Application>);
+
+#[derive(Deserialize, Debug, Default)]
+pub struct Application {
+  pub server_name: Option<String>,
+  pub reverse_proxy: Option<Vec<ReverseProxyOption>>,
+  pub tls: Option<TlsOption>,
+}
+
+#[derive(Deserialize, Debug, Default)]
+pub struct TlsOption {
+  pub tls_cert_path: Option<String>,
+  pub tls_cert_key_path: Option<String>,
+  pub https_redirection: Option<bool>,
+}
+
+#[derive(Deserialize, Debug, Default)]
+pub struct ReverseProxyOption {
+  pub path: Option<String>,
+  pub upstream: Vec<UpstreamOption>,
+}
+
+#[derive(Deserialize, Debug, Default)]
+pub struct UpstreamOption {
+  pub location: String,
+  pub tls: Option<bool>,
+}
+impl UpstreamOption {
+  pub fn to_uri(&self) -> Result<hyper::Uri> {
+    let mut scheme = "http";
+    if let Some(t) = self.tls {
+      if t {
+        scheme = "https";
+      }
+    }
+    let location = format!("{}://{}", scheme, self.location);
+    location.parse::<hyper::Uri>().map_err(|e| anyhow!("{}", e))
+  }
+}
+
+impl ConfigToml {
+  pub fn new(config_file: &str) -> Result<Self> {
+    let config_str = if let Ok(s) = fs::read_to_string(config_file) {
+      s
+    } else {
+      bail!("Failed to read config file");
+    };
+    let parsed: Result<ConfigToml> = toml::from_str(&config_str)
+      .map_err(|e: toml::de::Error| anyhow!("Failed to parse toml config: {:?}", e));
+    parsed
+  }
+}