+ up

src/main/java/su/xserver/iikocon/config/AppConfig.java

@@ -0,0 +1,105 @@
+package su.xserver.iikocon.config;
+
+import io.vertx.core.json.JsonObject;
+import java.util.Map;
+
+public class AppConfig {
+
+  public ServerConfig server;
+  public DatabaseConfig database;
+  public RedisConfig redis;
+
+  public static AppConfig from(JsonObject json) {
+    JsonObject resolved = json.copy();
+    applyEnvOverrides(resolved);
+    return resolved.mapTo(AppConfig.class);
+  }
+
+  private static void applyEnvOverrides(JsonObject config) {
+    Map<String, String> env = System.getenv();
+
+    env.forEach((key, value) -> {
+      String path = envKeyToPath(key);
+
+      if (path != null && exists(config, path)) {
+        setValue(config, path, value);
+      }
+    });
+  }
+
+  /**
+   * SERVER__MAX_POOL_SIZE -> server.maxPoolSize
+   */
+  private static String envKeyToPath(String envKey) {
+    if (!envKey.contains("__")) {
+      return null;
+    }
+
+    String[] levels = envKey.toLowerCase().split("__");
+
+    for (int i = 0; i < levels.length; i++) {
+      levels[i] = toCamelCase(levels[i]);
+    }
+
+    return String.join(".", levels);
+  }
+
+  private static String toCamelCase(String value) {
+    String[] parts = value.split("_");
+    StringBuilder sb = new StringBuilder(parts[0]);
+
+    for (int i = 1; i < parts.length; i++) {
+      sb.append(Character.toUpperCase(parts[i].charAt(0)))
+        .append(parts[i].substring(1));
+    }
+
+    return sb.toString();
+  }
+
+  private static boolean exists(JsonObject json, String path) {
+    String[] parts = path.split("\\.");
+    JsonObject current = json;
+
+    for (int i = 0; i < parts.length - 1; i++) {
+      if (!current.containsKey(parts[i])) {
+        return false;
+      }
+      current = current.getJsonObject(parts[i]);
+    }
+    return current.containsKey(parts[parts.length - 1]);
+  }
+
+  private static void setValue(JsonObject json, String path, String value) {
+    String[] parts = path.split("\\.");
+    JsonObject current = json;
+
+    for (int i = 0; i < parts.length - 1; i++) {
+      current = current.getJsonObject(parts[i]);
+    }
+
+    String key = parts[parts.length - 1];
+    Object oldValue = current.getValue(key);
+    current.put(key, cast(value, oldValue));
+  }
+
+  private static Object cast(String value, Object oldValue) {
+    if (oldValue instanceof Integer) return Integer.parseInt(value);
+    if (oldValue instanceof Long) return Long.parseLong(value);
+    if (oldValue instanceof Boolean) return Boolean.parseBoolean(value);
+    if (oldValue == null) return value;
+    return value;
+  }
+
+  public JsonObject json() {
+    return new JsonObject()
+      .put("server", server.json().getJsonObject("server"))
+      .put("database", database.json().getJsonObject("database"))
+      .put("redis", redis.json().getJsonObject("redis"));
+  }
+
+  @Override
+  public String toString() {
+    return json().encode();
+  }
+}
+

src/main/java/su/xserver/iikocon/config/DatabaseConfig.java

@@ -0,0 +1,26 @@
+package su.xserver.iikocon.config;
+
+import io.vertx.core.json.JsonObject;
+
+public class DatabaseConfig {
+  public String host;
+  public int port;
+  public String database;
+  public String user;
+  public String password;
+  public int connectionTimeout;
+  public int maxPoolSize;
+
+  public JsonObject json() {
+    return new JsonObject()
+      .put("database", new JsonObject()
+        .put("host", host)
+        .put("port", port)
+        .put("user", user)
+        .put("password", password)
+        .put("database", database)
+        .put("connectionTimeout", connectionTimeout)
+        .put("maxPoolSize", maxPoolSize)
+      );
+  }
+}

src/main/java/su/xserver/iikocon/config/RedisConfig.java

@@ -0,0 +1,22 @@
+package su.xserver.iikocon.config;
+
+import io.vertx.core.json.JsonObject;
+
+public class RedisConfig {
+  public String host;
+  public int port;
+  public String password;
+  public int maxPoolSize;
+  public int maxWaitingHandlers;
+
+  public JsonObject json() {
+    return new JsonObject()
+      .put("redis", new JsonObject()
+        .put("host", host)
+        .put("port", port)
+        .put("password", password)
+        .put("maxPoolSize", maxPoolSize)
+        .put("maxWaitingHandlers", maxWaitingHandlers)
+      );
+  }
+}

src/main/java/su/xserver/iikocon/config/ServerConfig.java

@@ -0,0 +1,16 @@
+package su.xserver.iikocon.config;
+
+import io.vertx.core.json.JsonObject;
+
+public class ServerConfig {
+  public int port;
+  public String host;
+
+  public JsonObject json() {
+    return new JsonObject()
+      .put("server", new JsonObject()
+        .put("port", port)
+        .put("host", host)
+      );
+  }
+}