Making API port configurable

.talismanrc

@@ -71,3 +71,5 @@ fileignoreconfig:
   checksum: 9a1890534ecbc051bc3866d7cec20611f9a9b800eb0f189c270c683d521aa3bd
 - filename: README.md
   checksum: 6da2c89d18f9096c1547cae26762d8a9ec2d808e80a58c411e3362a69c0779d6
+- filename: README.md
+  checksum: e3e0192e7f8a73434e40b2820d41a5ee15b9f5290e033f492bf49446a19ae56c

README.md

@@ -1081,17 +1081,17 @@ Depending upon if you are developing the app or packaging it for production, you
 
 ### Deploy app for development
 
-To run the app locally in development mode, go to ```smojol-app/cobol-lekt``` and run ```npm run serve```. This should start the app server (8080 by default).
+Make sure that the app is already built as described in [How to Build](#how-to-build).
 
-Then, run ```mvn clean verify -Dmaven.test.skip``` as described in [How to Build](#how-to-build).
+To run the app locally in development mode, go to ```smojol-app/cobol-lekt``` and run ```npm run serve```. This should start the development server (8080 by default).
 
-Finally, start the API server (starts on port 7070):
+Finally, start the API server (starts on port 7070, if ```PORT``` is not specified):
 
 ```
-DATABASE_URL=jdbc:sqlite:/path/to/db/file DATABASE_USER="<db_user>" DATABASE_PASSWORD="<db-password>" java -jar smojol-api/target/smojol-api.jar
+PORT=<port> DATABASE_URL=jdbc:sqlite:/path/to/db/file DATABASE_USER="<db_user>" DATABASE_PASSWORD="<db-password>" java -jar smojol-api/target/smojol-api.jar
 ```
 
-The development server proxies calls to ```api/*``` to ```localhost:7070```, thus bypassing CORS restrictions.
+The development server proxies calls to ```api/*``` to ```localhost:<port>```, thus bypassing CORS restrictions.
 
 ### Deploy for production
 
@@ -1101,15 +1101,15 @@ If you are deploying the UI to be served by the API itself, run:
 scripts/build-all.sh
 ```
 
-Start the API server (starts on port 7070):
+Start the API server (starts on port 7070, if ```PORT``` is not specified):
 
 ```
-DATABASE_URL=jdbc:sqlite:/path/to/db/file DATABASE_USER="<db_user>" DATABASE_PASSWORD="<db-password>" java -jar smojol-api/target/smojol-api.jar
+PORT=<port> DATABASE_URL=jdbc:sqlite:/path/to/db/file DATABASE_USER="<db_user>" DATABASE_PASSWORD="<db-password>" java -jar smojol-api/target/smojol-api.jar
 ```
 
 ## Test it out!
 
-Hit ```localhost:7070```, and you should see the app.
+Hit ```localhost:<port>```, and you should see the app.
 
 
 The rest of this file is mostly technical notes for my personal documentation.

smojol-api/src/main/java/org/smojol/api/ApiMain.java

@@ -13,11 +13,16 @@
 import static org.smojol.api.database.DbContext.fromSystemEnv;
 
 public class ApiMain {
+    public static final int DEFAULT_PORT = 7070;
+
     public static void main(String[] args) throws IOException, URISyntaxException, SQLException {
         Gson gson = new GsonBuilder().create();
         JsonMapper gsonMapper = getJsonMapper(gson);
         DbContext dbContext = fromSystemEnv();
-        new ApiServer().runServer(7070, gsonMapper, gson, dbContext);
+        String portString = System.getenv("PORT");
+
+        int port = portString == null ? DEFAULT_PORT : Integer.parseInt(portString);
+        new ApiServer().runServer(port, gsonMapper, gson, dbContext);
     }
 
     private static JsonMapper getJsonMapper(Gson gson) {