Made changes suggested in Diego's review

exporter/opentelemetry-exporter-prometheus-remote-write/src/opentelemetry/exporter/prometheus_remote_write/__init__.py

@@ -91,15 +91,15 @@ def basic_auth(self, basic_auth: Dict):
         if basic_auth:
             if "username" not in basic_auth:
                 raise ValueError("username required in basic_auth")
-            if (
-                "password" not in basic_auth
-                and "password_file" not in basic_auth
-            ):
+            if "password_file" in basic_auth:
+                if "password" in basic_auth:
+                    raise ValueError(
+                        "basic_auth cannot contain password and password_file"
+                    )
+                with open(basic_auth["password_file"]) as file:
+                    basic_auth["password"] = file.readline().strip()
+            elif "password" not in basic_auth:
                 raise ValueError("password required in basic_auth")
-            if "password" in basic_auth and "password_file" in basic_auth:
-                raise ValueError(
-                    "basic_auth cannot contain password and password_file"
-                )
         self._basic_auth = basic_auth
 
     @property
@@ -154,10 +154,10 @@ def headers(self, headers: Dict):
     def export(
         self, export_records: Sequence[ExportRecord]
     ) -> MetricsExportResult:
-        timeseries = self.convert_to_timeseries(export_records)
-        message = self.build_message(timeseries)
-        headers = self.get_headers()
-        return self.send_message(message, headers)
+        timeseries = self._convert_to_timeseries(export_records)
+        message = self._build_message(timeseries)
+        headers = self._build_headers()
+        return self._send_message(message, headers)
 
     def shutdown(self) -> None:
         pass
@@ -301,13 +301,13 @@ def add_label(label_name, label_value):
         timeseries.samples.append(sample)
         return timeseries
 
-    def build_message(self, timeseries: Sequence[TimeSeries]) -> bytes:
+    def _build_message(self, timeseries: Sequence[TimeSeries]) -> bytes:
         write_request = WriteRequest()
         write_request.timeseries.extend(timeseries)
         serialized_message = write_request.SerializeToString()
         return snappy.compress(serialized_message)
 
-    def get_headers(self) -> Dict:
+    def _build_headers(self) -> Dict:
         headers = {
             "Content-Encoding": "snappy",
             "Content-Type": "application/x-protobuf",
@@ -318,16 +318,12 @@ def get_headers(self) -> Dict:
                 headers[header_name] = header_value
         return headers
 
-    def send_message(
+    def _send_message(
         self, message: bytes, headers: Dict
     ) -> MetricsExportResult:
         auth = None
         if self.basic_auth:
-            if "password" in self.basic_auth:
-                auth = (self.basic_auth["username"], self.basic_auth["password"])
-            elif "password_file":
-                with open(self.basic_auth["password_file"]) as file:
-                    auth = (self.basic_auth["username"], file.readline())
+            auth = (self.basic_auth["username"], self.basic_auth["password"])
 
         cert = None
         verify = True

exporter/opentelemetry-exporter-prometheus-remote-write/tests/test_prometheus_remote_write_exporter.py

@@ -358,65 +358,59 @@ def create_label(name, value):
         self.assertEqual(timeseries, expected_timeseries)
 
 
-class ResponseStub:
-    def __init__(self, status_code):
-        self.status_code = status_code
-        self.reason = "dummy_reason"
-        self.content = "dummy_content"
-
-
 class TestExport(unittest.TestCase):
     # Initializes test data that is reused across tests
     def setUp(self):
-        self._exporter = PrometheusRemoteWriteMetricsExporter(
+        self.exporter = PrometheusRemoteWriteMetricsExporter(
             endpoint="/prom/test_endpoint"
         )
 
     # Ensures export is successful with valid export_records and config
-    @mock.patch("requests.post", return_value=ResponseStub(200))
+    @patch("requests.post")
     def test_export(self, mock_post):
+        mock_post.return_value.configure_mock(**{"status_code": 200})
         test_metric = Counter("testname", "testdesc", "testunit", int, None)
-        labels = {"environment": "testing"}
+        labels = get_dict_as_key({"environment": "testing"})
         record = ExportRecord(
-            test_metric, labels, SumAggregator(), Resource({}),
+            test_metric, labels, SumAggregator(), Resource({})
         )
-        result = self._exporter.export([record])
+        result = self.exporter.export([record])
         self.assertIs(result, MetricsExportResult.SUCCESS)
         self.assertEqual(mock_post.call_count, 1)
 
-    @mock.patch("requests.post", return_value=ResponseStub(200))
+    @patch("requests.post")
     def test_valid_send_message(self, mock_post):
-        result = self._exporter.send_message(bytes(), {})
+        mock_post.return_value.configure_mock(**{"status_code": 200})
+        result = self.exporter._send_message(bytes(), {})
         self.assertEqual(mock_post.call_count, 1)
         self.assertEqual(result, MetricsExportResult.SUCCESS)
 
-    @mock.patch("requests.post", return_value=ResponseStub(404))
+    @patch("requests.post")
     def test_invalid_send_message(self, mock_post):
-        result = self._exporter.send_message(bytes(), {})
+        mock_post.return_value.configure_mock(
+            **{
+                "status_code": 404,
+                "reason": "test_reason",
+                "content": "test_content",
+            }
+        )
+        result = self.exporter._send_message(bytes(), {})
         self.assertEqual(mock_post.call_count, 1)
         self.assertEqual(result, MetricsExportResult.FAILURE)
 
     # Verifies that build_message calls snappy.compress and returns SerializedString
-    @mock.patch("snappy.compress", return_value=bytes())
+    @patch("snappy.compress", return_value=bytes())
     def test_build_message(self, mock_compress):
-        test_timeseries = [
-            TimeSeries(),
-            TimeSeries(),
-        ]
-        message = self._exporter.build_message(test_timeseries)
+        message = self.exporter._build_message([TimeSeries()])
         self.assertEqual(mock_compress.call_count, 1)
         self.assertIsInstance(message, bytes)
 
     # Ensure correct headers are added when valid config is provided
-    def test_get_headers(self):
-        self._exporter.headers = {"Custom Header": "test_header"}
-
-        headers = self._exporter.get_headers()
-        self.assertEqual(headers.get("Content-Encoding", ""), "snappy")
-        self.assertEqual(
-            headers.get("Content-Type", ""), "application/x-protobuf"
-        )
-        self.assertEqual(
-            headers.get("X-Prometheus-Remote-Write-Version", ""), "0.1.0"
-        )
-        self.assertEqual(headers.get("Custom Header", ""), "test_header")
+    def test_build_headers(self):
+        self.exporter.headers = {"Custom Header": "test_header"}
+
+        headers = self.exporter._build_headers()
+        self.assertEqual(headers["Content-Encoding"], "snappy")
+        self.assertEqual(headers["Content-Type"], "application/x-protobuf")
+        self.assertEqual(headers["X-Prometheus-Remote-Write-Version"], "0.1.0")
+        self.assertEqual(headers["Custom Header"], "test_header")