Added Rate limit custom exception

Author: yassine

src/main/java/io/ipdata/client/error/RateLimitException.java

@@ -0,0 +1,11 @@
+package io.ipdata.client.error;
+
+public class RateLimitException extends RemoteIpdataException {
+  public RateLimitException(String message, Throwable cause, int status) {
+    super(message, cause, status);
+  }
+
+  public RateLimitException(String message, int status) {
+    super(message, status);
+  }
+}

src/main/java/io/ipdata/client/service/ApiErrorDecoder.java

@@ -4,6 +4,7 @@
 import com.google.common.io.CharStreams;
 import feign.Response;
 import feign.codec.ErrorDecoder;
+import io.ipdata.client.error.RateLimitException;
 import io.ipdata.client.error.RemoteIpdataException;
 import io.ipdata.client.model.Error;
 import java.io.IOException;
@@ -13,7 +14,7 @@
 
 @RequiredArgsConstructor
 public class ApiErrorDecoder implements ErrorDecoder {
-
+  private static final int RATE_LIMIT_STATUS = 403;
   private final ObjectMapper mapper;
   private final Logger logger;
 
@@ -22,12 +23,17 @@ public Exception decode(String methodKey, Response response) {
     String message = null;
     try {
       //parse the url, but would strip the query parameters containing sensitive information (api-key)
+      int responseCode = response.status();
       URL url = new URL(response.request().url());
       logger.error("An error occurred during an Ipdata API call: got status '{}' for path '{}'",
-        response.status(), url.getPath());
+        responseCode, url.getPath());
       message = CharStreams.toString(response.body().asReader());
       Error error = mapper.readValue(message, Error.class);
-      return new RemoteIpdataException(error.getMessage(), response.status());
+      if (responseCode == RATE_LIMIT_STATUS) {
+        return new RateLimitException(error.getMessage(), responseCode);
+      } else {
+        return new RemoteIpdataException(error.getMessage(), response.status());
+      }
     } catch (IOException ioException) {
       ioException.printStackTrace();
       return new RemoteIpdataException(message, response.status());