Add method to retrieve issue to pagure module

Signed-off-by: Michal Konečný <mkonecny@redhat.com>

tests/utils/test_pagure.py

@@ -78,6 +78,70 @@ class TestPagureGetAuthHeader:
         assert exp_header == header
 
 
+class TestPagureGetIssue:
+    """
+    Test class for `toddlers.pagure.Pagure.get_issue` method.
+    """
+
+    def setup(self):
+        """
+        Setup method for the test class.
+        """
+        config = {
+            "pagure_url": "https://pagure.io",
+            "pagure_api_key": "Very secret key",
+        }
+        self.pagure = pagure.set_pagure(config)
+        self.pagure._requests_session = Mock()
+
+    def test_get_issue(self):
+        """
+        Assert that issue on pagure is retrieved correctly.
+        """
+        response_mock = Mock()
+        response_mock.status_code = 200
+        data = {"id": 100}
+        response_mock.json.return_value = data
+
+        self.pagure._requests_session.get.return_value = response_mock
+
+        issue_id = 100
+        namespace = "test"
+
+        result = self.pagure.get_issue(issue_id, namespace)
+
+        self.pagure._requests_session.get.assert_called_with(
+            "https://pagure.io/api/0/test/issue/100",
+            headers=self.pagure.get_auth_header(),
+        )
+
+        assert result == data
+
+    def test_get_issue_not_ok(self):
+        """
+        Assert that failing to retrieve issue on pagure is handled correctly.
+        """
+        response_mock = Mock()
+        response_mock.status_code = 500
+
+        self.pagure._requests_session.get.return_value = response_mock
+
+        issue_id = 100
+        namespace = "test"
+
+        expected_error = "Couldn't retrieve issue '{}' from project '{}'".format(
+            issue_id, namespace
+        )
+
+        with pytest.raises(PagureError, match=expected_error):
+            self.pagure.get_issue(issue_id, namespace)
+
+        self.pagure._requests_session.get.assert_called_with(
+            "https://pagure.io/api/0/test/issue/100",
+            headers=self.pagure.get_auth_header(),
+        )
+
+
 class TestPagureCloseIssue:
     """
     Test class for `toddlers.pagure.Pagure.close_issue` function.

toddlers/utils/pagure.py

@@ -79,6 +79,47 @@ class Pagure:
             "Content-Type": "application/json",
         }
 
+    def get_issue(self, issue_id: int, namespace: str) -> dict:
+        """
+        Get specific issue from project in pagure.
+
+        Params:
+          issue_id: Issue to retrieve
+          namespace: Project namespace. For example: 'releng/fedora-scm-requests'
+
+        Returns:
+          Dictionary containing pagure issue.
+
+        Raises:
+          toddlers.utils.exceptions.PagureError when the issue couldn't be retrieved.
+        """
+        api_url = "{0}/api/0/{1}/issue/{2}".format(
+            self._pagure_url, namespace, issue_id
+        )
+        headers = self.get_auth_header()
+
+        log.debug(
+            "Retrieving issue '{0}' from project '{1}'".format(issue_id, namespace)
+        )
+        response = self._requests_session.get(api_url, headers=headers)
+
+        result = {}
+
+        if response.status_code == 200:
+            result = response.json()
+            return result
+
+        log.error(
+            "Error when retrieving issue '{0}' from project '{1}'. "
+            "Got status_code '{2}'.".format(issue_id, namespace, response.status_code)
+        )
+
+        raise PagureError(
+            "Couldn't retrieve issue '{0}' from project '{1}'".format(
+                issue_id, namespace
+            )
+        )
+
     def close_issue(
         self, issue_id: int, namespace: str, message: str, reason: str = "Closed"
     ):