Prepare dockerized build for Railway

Cargo.lock

@@ -137,6 +137,21 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8d7439c3735f405729d52c3fbbe4de140eaf938a1fe47d227c27f8254d4302a5"
 
+[[package]]
+name = "dotenvy"
+version = "0.15.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1aaf95b3e5c8f23aa320147307562d361db0ae0d51242340f558153b4eb2439b"
+
+[[package]]
+name = "envy"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f47e0157f2cb54f5ae1bd371b30a2ae4311e1c028f575cd4e81de7353215965"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "fdeflate"
 version = "0.3.0"
@@ -897,6 +912,8 @@ name = "time-banner"
 version = "0.1.0"
 dependencies = [
  "axum",
+ "dotenvy",
+ "envy",
  "futures",
  "png",
  "resvg",

Cargo.toml

@@ -15,3 +15,5 @@ tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 futures = "0.3.28"
 png = "0.17.9"
+dotenvy = "0.15.7"
+envy = "0.4.2"

Dockerfile

@@ -0,0 +1,43 @@
+# Build Stage
+FROM rust:1.68.0 as builder
+
+RUN USER=root cargo new --bin time-banner
+WORKDIR ./time-banner
+ENV CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse
+COPY ./Cargo.toml ./Cargo.toml
+# Build empty app with downloaded dependencies to produce a stable image layer for next build
+RUN cargo build --release
+
+# Build web app with own code
+RUN rm src/*.rs
+ADD . ./
+RUN rm ./target/release/deps/time-banner*
+RUN cargo build --release
+
+
+FROM debian:buster-slim
+ARG APP=/usr/src/app
+
+RUN apt-get update \
+    && apt-get install -y ca-certificates tzdata \
+    && rm -rf /var/lib/apt/lists/*
+
+ENV TZ=Etc/UTC \
+    APP_USER=appuser
+
+RUN groupadd $APP_USER \
+    && useradd -g $APP_USER $APP_USER \
+    && mkdir -p ${APP}
+
+COPY --from=builder /time-banner/target/release/time-banner ${APP}/time-banner
+
+RUN chown -R $APP_USER:$APP_USER ${APP}
+
+USER $APP_USER
+WORKDIR ${APP}
+
+EXPOSE 3000
+ENV PORT 3000
+
+
+CMD ["./time-banner"]

src/config.rs

@@ -0,0 +1,57 @@
+use serde::Deserialize;
+use tracing::Level;
+
+#[derive(Deserialize, Debug)]
+pub enum Environment {
+    Production,
+    Development,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct Configuration {
+    #[serde(default = "default_env")]
+    pub env: Environment,
+
+    #[serde(default = "default_port")]
+    pub port: u16,
+}
+
+fn default_port() -> u16 {
+    3000
+}
+
+fn default_env() -> Environment {
+    Environment::Development
+}
+
+impl Configuration {
+    pub fn socket_addr(&self) -> [u8; 4] {
+        match self.env {
+            Environment::Production => {
+                let socket = [0, 0, 0, 0];
+                tracing::info!(
+                    "Starting Production on {:?}:{}",
+                    socket.as_slice(),
+                    self.port
+                );
+                socket
+            }
+            Environment::Development => {
+                let socket = [127, 0, 0, 1];
+                tracing::info!(
+                    "Starting Development on {:?}:{}",
+                    socket.as_slice(),
+                    self.port
+                );
+                socket
+            }
+        }
+    }
+
+    pub fn log_level(&self) -> Level {
+        match self.env {
+            Environment::Production => Level::INFO,
+            Environment::Development => Level::DEBUG,
+        }
+    }
+}

src/main.rs

@@ -1,3 +1,5 @@
+mod config;
+
 use std::net::SocketAddr;
 
 use axum::{http::StatusCode, Json, response::IntoResponse, Router, routing::{get, post}};
@@ -5,21 +7,33 @@ use axum::body::{Bytes, Full};
 use axum::extract::ConnectInfo;
 use axum::http::header;
 use axum::response::Response;
+use dotenvy::dotenv;
+use config::Configuration;
 
 mod svg;
 
+
 #[tokio::main]
 async fn main() {
-    // initialize tracing
-    tracing_subscriber::fmt::init();
+    // Parse dotenv files and expose them as environment variables
+    dotenv().ok();
 
-    let app = Router::new()
-        .route("/", get(root));
+    // envy uses our Configuration struct to parse environment variables
+    let config = envy::from_env::<Configuration>().expect("Please provide PORT env var");
+
+    // initialize tracing
+    tracing_subscriber::fmt()
+        // With the log_level from our config
+        .with_max_level(config.log_level())
+        .init();
+
+    // build our application with a route
+    let app = Router::new().route("/", get(root_handler));
 
     // run our app with hyper
     // `axum::Server` is a re-export of `hyper::Server`
-    let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
-    tracing::debug!("listening on {}", addr);
+    let addr = SocketAddr::from((config.socket_addr(), config.port));
+
     axum::Server::bind(&addr)
         .serve(app.into_make_service_with_connect_info::<SocketAddr>())
         .await
@@ -27,7 +41,7 @@ async fn main() {
 }
 
 // basic handler that responds with a static string
-async fn root(connect_info: ConnectInfo<SocketAddr>) -> impl IntoResponse {
+async fn root_handler(connect_info: ConnectInfo<SocketAddr>) -> impl IntoResponse {
     let raw_image = svg::get();
 
     if raw_image.is_err() {

src/svg.rs

@@ -29,8 +29,6 @@ pub fn get() -> Result<Vec<u8>, RenderError> {
         fontdb.load_system_fonts();
 
         let svg_data = std::fs::read("test.svg").unwrap();
-        // print bytes as string
-        println!("{:?}", String::from_utf8(svg_data.clone()).unwrap());
 
         let mut tree_result = usvg::Tree::from_data(&svg_data, &opt);
         if tree_result.is_err() { return Err(RenderError { message: Some("Failed to parse".to_string()) }); }