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readness_check_port defaults to port #45

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Merged
merged 1 commit into from
Jul 18, 2022
Merged

readness_check_port defaults to port #45

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2 changes: 1 addition & 1 deletion .rustfmt.toml
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Original file line number Diff line number Diff line change
@@ -1 +1 @@
max_width=160
max_width=120
55 changes: 33 additions & 22 deletions src/main.rs
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Expand Up @@ -11,10 +11,28 @@ use tokio_retry::{strategy::FixedInterval, Retry};

type Error = Box<dyn std::error::Error + Send + Sync + 'static>;

struct AdapterOptions {
host: String,
port: String,
readiness_check_port: String,
readiness_check_path: String,
base_path: Option<String>,
}

#[tokio::main]
async fn main() -> Result<(), Error> {
env_logger::init();

// setup config options from environment variables
let options = &AdapterOptions {
host: env::var("HOST").unwrap_or_else(|_| "127.0.0.1".to_string()),
port: env::var("PORT").unwrap_or_else(|_| "8080".to_string()),
readiness_check_port: env::var("READINESS_CHECK_PORT")
.unwrap_or_else(|_| env::var("PORT").unwrap_or_else(|_| "8080".to_string())),
readiness_check_path: env::var("READINESS_CHECK_PATH").unwrap_or_else(|_| "/".to_string()),
base_path: env::var("REMOVE_BASE_PATH").ok(),
};

// register as an external extension
let handle = Handle::current();
tokio::task::spawn_blocking(move || {
Expand All @@ -31,48 +49,41 @@ async fn main() -> Result<(), Error> {
// check if the application is ready every 10 milliseconds
Retry::spawn(FixedInterval::from_millis(10), || {
let readiness_check_url = format!(
"http://127.0.0.1:{}{}",
env::var("READINESS_CHECK_PORT").unwrap_or_else(|_| "8080".to_string()),
env::var("READINESS_CHECK_PATH").unwrap_or_else(|_| "/".to_string())
"http://{}:{}{}",
options.host, options.readiness_check_port, options.readiness_check_path
);
reqwest::get(readiness_check_url)
})
.await?;

// start lambda runtime
let options = &HandlerOptions {
http_client: Client::builder().redirect(redirect::Policy::none()).build().unwrap(),
host: env::var("HOST").unwrap_or_else(|_| "127.0.0.1".to_string()),
port: env::var("PORT").unwrap_or_else(|_| "8080".to_string()),
base_path: env::var("REMOVE_BASE_PATH").unwrap_or_default(),
};
lambda_http::run(http_handler(move |event: Request| async move { http_proxy_handler(event, options).await })).await?;
let http_client = &Client::builder().redirect(redirect::Policy::none()).build().unwrap();
lambda_http::run(http_handler(|event: Request| async move {
http_proxy_handler(event, http_client, options).await
}))
.await?;
Ok(())
}

struct HandlerOptions {
http_client: Client,
host: String,
port: String,
base_path: String,
}

async fn http_proxy_handler(event: Request, options: &HandlerOptions) -> Result<Response<Body>, Error> {
async fn http_proxy_handler(
event: Request,
http_client: &Client,
options: &AdapterOptions,
) -> Result<Response<Body>, Error> {
let host = options.host.as_str();
let port = options.port.as_str();
let (parts, body) = event.into_parts();
let mut path_and_query = parts.uri.path_and_query().unwrap().as_str();
// strip away Base Path if environment variable REMOVE_BASE_PATH is set.
if options.base_path != String::default() {
if let Some(value) = path_and_query.strip_prefix(options.base_path.as_str()) {
if options.base_path.is_some() {
if let Some(value) = path_and_query.strip_prefix(options.base_path.as_ref().unwrap()) {
path_and_query = value;
};
}
let app_url = format!("http://{}:{}{}", host, port, path_and_query);
debug!("app_url is {:#?}", app_url);

let app_response = options
.http_client
let app_response = http_client
.request(parts.method, app_url)
.headers(parts.headers)
.body(body.to_vec())
Expand Down