From d866fcc48f076c3f9c639b68d114015507059e16 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 15 May 2010 10:29:21 -0600
Subject: [PATCH] Fix #5501 (Error after query of social metadata if ISBN not
 find)

---
 src/calibre/ebooks/metadata/amazon.py | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/calibre/ebooks/metadata/amazon.py b/src/calibre/ebooks/metadata/amazon.py
index d1473be8f0..1713d044f5 100644
--- a/src/calibre/ebooks/metadata/amazon.py
+++ b/src/calibre/ebooks/metadata/amazon.py
@@ -19,12 +19,18 @@ AWS_NS = 'http://webservices.amazon.com/AWSECommerceService/2005-10-05'
 def AWS(tag):
     return '{%s}%s'%(AWS_NS, tag)
 
-def check_for_errors(root):
+class ISBNNotFound(ValueError):
+    pass
+
+def check_for_errors(root, isbn):
     err = root.find('.//'+AWS('Error'))
     if err is not None:
+        text = etree.tostring(err, method='text', pretty_print=True,
+                    encoding=unicode)
+        if 'AWS.InvalidParameterValue'+isbn in text:
+            raise ISBNNotFound(isbn)
         raise Exception('Failed to get metadata with error: '\
-                + etree.tostring(err, method='text', pretty_print=True,
-                    encoding=unicode))
+                + text)
 
 def get_social_metadata(title, authors, publisher, isbn):
     mi = MetaInformation(title, authors)
@@ -32,7 +38,10 @@ def get_social_metadata(title, authors, publisher, isbn):
         br = browser()
         response_xml = br.open('http://status.calibre-ebook.com/aws/metadata/'+isbn).read()
         root = etree.fromstring(response_xml)
-        check_for_errors(root)
+        try:
+            check_for_errors(root, isbn)
+        except ISBNNotFound:
+            return mi
         mi.title = root.findtext('.//'+AWS('Title'))
         authors = [x.text for x in root.findall('.//'+AWS('Author'))]
         if authors: