Merge pull request #12 from mozilla/3-dockerflow-env

Read GEOIP_DB_PATH from env (ref #4)

README.md

@@ -17,6 +17,14 @@ This project should run on the latest stable version of Rust. Unstable features
 
 A GeoIP database is required. For development purposes, one can be obtained from [the Maxmind website](https://dev.maxmind.com/geoip/geoip2/geolite2/). The GeoLite2 Country database is recommended. It should be placed at the root of the repository.
 
+## Configuration
+
+Via environment variables:
+
+- `HOST`: host (default: `localhost`)
+- `PORT`: port number (default: `8080`)
+- `GEOIP_DB_PATH`: path to GeoIP database (default: `./GeoLite2-Country.mmdb`)
+
 ## Tests
 
 Tests can be run with Cargo as well

src/main.rs

@@ -31,7 +31,8 @@ fn main() {
     let sys = actix::System::new("classify-client");
 
     let geoip = actix::SyncArbiter::start(1, || {
-        let geoip_path = "./GeoLite2-Country.mmdb";
+        let geoip_path =
+            env::var("GEOIP_DB_PATH").unwrap_or_else(|_| "./GeoLite2-Country.mmdb".to_string());
         GeoIpActor::from_path(&geoip_path).unwrap_or_else(|err| {
             panic!(format!(
                 "Could not open geoip database at {:?}: {}",