fixes for minio IamEc2MetaData

minio-ec2-iam.patch

Index: .github/workflows/pythonpackage-linux.yml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- .github/workflows/pythonpackage-linux.yml	(revision 3331f178884ac36da622a81e73ab981e25183783)
+++ .github/workflows/pythonpackage-linux.yml	(date 1578582406638)
@@ -26,7 +26,7 @@
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
-        python -m pip install --upgrade pip
+        python -m pip install --upgrade pip setuptools
         pip install urllib3 certifi pytz pyflakes faker nose
     - name: Test with nosetests
       run: |
Index: minio/api.py
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- minio/api.py	(revision 3331f178884ac36da622a81e73ab981e25183783)
+++ minio/api.py	(date 1578587755526)
@@ -194,6 +194,7 @@
                         Static(access_key, secret_key, session_token),
                         EnvAWS(),
                         EnvMinio(),
+                        IamEc2MetaData(),
                     ]
                 )
             ) 
Index: .github/workflows/pythonpackage-windows.yml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- .github/workflows/pythonpackage-windows.yml	(revision 3331f178884ac36da622a81e73ab981e25183783)
+++ .github/workflows/pythonpackage-windows.yml	(date 1578583529250)
@@ -26,7 +26,7 @@
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
-        python -m pip install --upgrade pip
+        python -m pip install --upgrade pip setuptools
         pip install urllib3 certifi pytz pyflakes faker nose
     - name: Test with nosetests
       run: |
Index: minio/credentials/aws_iam.py
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- minio/credentials/aws_iam.py	(revision 3331f178884ac36da622a81e73ab981e25183783)
+++ minio/credentials/aws_iam.py	(date 1578587601955)
@@ -40,9 +40,12 @@
 
     def request_cred_list(self):
         url = self._endpoint + self.iam_security_creds_path
-        res = self._http_client.urlopen('GET', url)
-        if res['status'] != 200:
-            raise ResponseError(res)
+        try:
+            res = self._http_client.urlopen('GET', url)
+            if res['status'] != 200:
+                return []
+        except:
+            return []
         creds = res['data'].split('\n')
         return creds
 
@@ -50,7 +53,7 @@
         url = self._endpoint + self.iam_security_creds_path + "/" + creds_name
         res = self._http_client.urlopen('GET', url)
         if res['status'] != 200:
-            raise ResponseError(res)
+            raise ResponseError(res, 'GET')
 
         data = json.loads(res['data'])
         if data['Code'] != 'Success':
Index: tests/unit/minio_mocks.py
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- tests/unit/minio_mocks.py	(revision 3331f178884ac36da622a81e73ab981e25183783)
+++ tests/unit/minio_mocks.py	(date 1578588059875)
@@ -58,6 +58,11 @@
     def release_conn(self):
         return
 
+    def __getitem__(self, key):
+        if key == "status":
+            return self.status
+
+
 class MockConnection(object):
     def __init__(self):
         self.requests = []
@@ -67,11 +72,12 @@
 
     # noinspection PyUnusedLocal
     def request(self, method, url, headers, redirect=False):
-        return_request = self.requests.pop(0)
+        # only pop off matching requests
+        return_request = self.requests[0]
         return_request.mock_verify(method, url, headers)
-        return return_request
+        return self.requests.pop(0)
 
     # noinspection PyRedeclaration,PyUnusedLocal,PyUnusedLocal
-    def urlopen(self, method, url, headers, preload_content=False, body=None,
+    def urlopen(self, method, url, headers={}, preload_content=False, body=None,
                 redirect=False):
         return self.request(method, url, headers)