From 2823b0da782bc31304d597bb3c632fd619ddcec0 Mon Sep 17 00:00:00 2001
From: Kai Moritz <kai@juplo.de>
Date: Sat, 7 Nov 2015 16:07:09 +0100
Subject: [PATCH] Added helpful logging-statements to GraphApiErrorHandler

---
 .../juplo/facebook/client/GraphApiErrorHandler.java  | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/main/java/de/juplo/facebook/client/GraphApiErrorHandler.java b/src/main/java/de/juplo/facebook/client/GraphApiErrorHandler.java
index a8b2d28..6b1ab97 100644
--- a/src/main/java/de/juplo/facebook/client/GraphApiErrorHandler.java
+++ b/src/main/java/de/juplo/facebook/client/GraphApiErrorHandler.java
@@ -4,6 +4,9 @@ import de.juplo.facebook.exceptions.GraphApiException;
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.charset.Charset;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.client.ClientHttpResponse;
@@ -31,6 +34,9 @@ import org.springframework.web.client.ResponseErrorHandler;
  */
 public class GraphApiErrorHandler implements ResponseErrorHandler
 {
+  private final static Logger LOG =
+      LoggerFactory.getLogger(GraphApiErrorHandler.class);
+
   private final ResponseErrorHandler parent;
 
 
@@ -54,6 +60,7 @@ public class GraphApiErrorHandler implements ResponseErrorHandler
     if (!HttpStatus.BAD_REQUEST.equals(response.getStatusCode()))
     {
       // We will only handle 400 BAD REQUEST
+      LOG.debug("ignoring response with status-code {}.", response.getStatusCode());
       parent.handleError(response);
       return;
     }
@@ -62,6 +69,7 @@ public class GraphApiErrorHandler implements ResponseErrorHandler
     if (response.getBody() == null)
     {
       // There is no body to interpret in the HTTP-message
+      LOG.warn("Could not convert the response into an exception, because there is no message-body.");
       parent.handleError(response);
       return;
     }
@@ -72,12 +80,16 @@ public class GraphApiErrorHandler implements ResponseErrorHandler
     try
     {
       error = GraphApiException.create(body);
+      if (LOG.isInfoEnabled())
+        LOG.info("error-response: {}", new String(body, Charset.forName("UTF-8")));
     }
     catch (Exception e)
     {
       // The body of the HTTP-message could not be parsed.
       // Let the parent error-handler try to handle the response.
 
+      LOG.warn("Could not convert the response into an exception, because the body is unparsable: {}", body);
+
       // To do so, we have to wrap the original response to fill in
       // the buffered body, if needed
       ClientHttpResponse buffered = new ClientHttpResponse()
-- 
2.20.1