3 files changed, 24 insertions, 2 deletions
diff --git a/Cargo.lock b/Cargo.lock
index b75d2a1..87420dc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -279,6 +279,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "anyhow"
+version = "1.0.43"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "28ae2b3dec75a406790005a200b1bd89785afc02517a00ca99ecfe093ee9e6cf"
+
+[[package]]
 name = "async-trait"
 version = "0.1.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1842,6 +1848,7 @@ name = "water-levels"
 version = "0.1.0"
 dependencies = [
  "actix-web",
+ "anyhow",
  "env_logger",
  "float-cmp",
  "log",
diff --git a/Cargo.toml b/Cargo.toml
index 5a30e9e..1c086b4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,6 +6,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+anyhow     = "1"
 actix-web  = "3.3"
 env_logger = "0.9"
 maud       = { version = "0.22", features = ["actix-web"] }
diff --git a/src/main.rs b/src/main.rs
index 370b9a4..cf87858 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,17 +1,30 @@
+use std::str::FromStr;
+
 use actix_web::App;
 use actix_web::HttpServer;
 use actix_web::middleware::Logger;
+use anyhow::Context;
 
 mod frontend;
 mod backend;
 
 #[actix_web::main]
-async fn main() -> std::io::Result<()> {
+async fn main() -> anyhow::Result<()> {
     if let Err(std::env::VarError::NotPresent) = std::env::var("RUST_LOG") {
         std::env::set_var("RUST_LOG", "actix_web=info");
     }
     env_logger::init();
 
+    let bind = match std::env::var("WATER_LEVELS_HOST") {
+        Ok(var) => var,
+        Err(e) => anyhow::bail!("WATER_LEVELS_HOST not available: {:?}", e),
+    };
+
+    let port = match std::env::var("WATER_LEVELS_PORT") {
+        Ok(var) => u16::from_str(&var).context("Parsing port to u16")?,
+        Err(e) => anyhow::bail!("WATER_LEVELS_PORT not available: {:?}", e),
+    };
+
     HttpServer::new(|| {
         App::new()
             .wrap(Logger::default())
@@ -20,7 +33,8 @@ async fn main() -> std::io::Result<()> {
             .service(crate::frontend::make_landscape)
             .service(crate::frontend::calculate)
     })
-    .bind(("127.0.0.1", 8080))?
+    .bind((bind, port))?
     .run()
     .await
+    .map_err(anyhow::Error::from)
 }