feat(observability): enable OpenTelemetry metrics and tracing by default (#1410)

This change enables OpenTelemetry metrics and tracing by default. [Fix
for [Issues
1222](#1222)]

Author: sinhasubham

google/cloud/spanner_v1/_opentelemetry_tracing.py

@@ -24,17 +24,12 @@
     _metadata_with_span_context,
 )
 
-try:
-    from opentelemetry import trace
-    from opentelemetry.trace.status import Status, StatusCode
-    from opentelemetry.semconv.attributes.otel_attributes import (
-        OTEL_SCOPE_NAME,
-        OTEL_SCOPE_VERSION,
-    )
-
-    HAS_OPENTELEMETRY_INSTALLED = True
-except ImportError:
-    HAS_OPENTELEMETRY_INSTALLED = False
+from opentelemetry import trace
+from opentelemetry.trace.status import Status, StatusCode
+from opentelemetry.semconv.attributes.otel_attributes import (
+    OTEL_SCOPE_NAME,
+    OTEL_SCOPE_VERSION,
+)
 
 from google.cloud.spanner_v1.metrics.metrics_capture import MetricsCapture
 
@@ -70,11 +65,6 @@ def trace_call(
     if session:
         session._last_use_time = datetime.now()
 
-    if not (HAS_OPENTELEMETRY_INSTALLED and name):
-        # Empty context manager. Users will have to check if the generated value is None or a span
-        yield None
-        return
-
     tracer_provider = None
 
     # By default enable_extended_tracing=True because in a bid to minimize
@@ -155,11 +145,8 @@ def trace_call(
 
 
 def get_current_span():
-    if not HAS_OPENTELEMETRY_INSTALLED:
-        return None
     return trace.get_current_span()
 
 
 def add_span_event(span, event_name, event_attributes=None):
-    if span:
-        span.add_event(event_name, event_attributes)
+    span.add_event(event_name, event_attributes)

google/cloud/spanner_v1/request_id_header.py

@@ -43,7 +43,7 @@ def with_request_id(
     all_metadata = (other_metadata or []).copy()
     all_metadata.append((REQ_ID_HEADER_KEY, req_id))
 
-    if span is not None:
+    if span:
         span.set_attribute(X_GOOG_SPANNER_REQUEST_ID_SPAN_ATTR, req_id)
 
     return all_metadata

google/cloud/spanner_v1/session.py

@@ -251,11 +251,9 @@ def exists(self):
                         span,
                     ),
                 )
-                if span:
-                    span.set_attribute("session_found", True)
+                span.set_attribute("session_found", True)
             except NotFound:
-                if span:
-                    span.set_attribute("session_found", False)
+                span.set_attribute("session_found", False)
                 return False
 
         return True
@@ -317,18 +315,21 @@ def ping(self):
         """
         if self._session_id is None:
             raise ValueError("Session ID not set by back-end")
+
         database = self._database
         api = database.spanner_api
-        request = ExecuteSqlRequest(session=self.name, sql="SELECT 1")
-        api.execute_sql(
-            request=request,
-            metadata=database.metadata_with_request_id(
-                database._next_nth_request,
-                1,
-                _metadata_with_prefix(database.name),
-            ),
-        )
-        self._last_use_time = datetime.now()
+
+        with trace_call("CloudSpanner.Session.ping", self) as span:
+            request = ExecuteSqlRequest(session=self.name, sql="SELECT 1")
+            api.execute_sql(
+                request=request,
+                metadata=database.metadata_with_request_id(
+                    database._next_nth_request,
+                    1,
+                    _metadata_with_prefix(database.name),
+                    span,
+                ),
+            )
 
     def snapshot(self, **kw):
         """Create a snapshot to perform a set of reads with shared staleness.
@@ -566,20 +567,18 @@ def run_in_transaction(self, func, *args, **kw):
 
                 except Aborted as exc:
                     previous_transaction_id = txn._transaction_id
-                    if span:
-                        delay_seconds = _get_retry_delay(
-                            exc.errors[0],
-                            attempts,
-                            default_retry_delay=default_retry_delay,
-                        )
-                        attributes = dict(delay_seconds=delay_seconds, cause=str(exc))
-                        attributes.update(span_attributes)
-                        add_span_event(
-                            span,
-                            "Transaction was aborted in user operation, retrying",
-                            attributes,
-                        )
-
+                    delay_seconds = _get_retry_delay(
+                        exc.errors[0],
+                        attempts,
+                        default_retry_delay=default_retry_delay,
+                    )
+                    attributes = dict(delay_seconds=delay_seconds, cause=str(exc))
+                    attributes.update(span_attributes)
+                    add_span_event(
+                        span,
+                        "Transaction was aborted in user operation, retrying",
+                        attributes,
+                    )
                     _delay_until_retry(
                         exc, deadline, attempts, default_retry_delay=default_retry_delay
                     )
@@ -611,20 +610,18 @@ def run_in_transaction(self, func, *args, **kw):
 
                 except Aborted as exc:
                     previous_transaction_id = txn._transaction_id
-                    if span:
-                        delay_seconds = _get_retry_delay(
-                            exc.errors[0],
-                            attempts,
-                            default_retry_delay=default_retry_delay,
-                        )
-                        attributes = dict(delay_seconds=delay_seconds)
-                        attributes.update(span_attributes)
-                        add_span_event(
-                            span,
-                            "Transaction was aborted during commit, retrying",
-                            attributes,
-                        )
-
+                    delay_seconds = _get_retry_delay(
+                        exc.errors[0],
+                        attempts,
+                        default_retry_delay=default_retry_delay,
+                    )
+                    attributes = dict(delay_seconds=delay_seconds)
+                    attributes.update(span_attributes)
+                    add_span_event(
+                        span,
+                        "Transaction was aborted during commit, retrying",
+                        attributes,
+                    )
                     _delay_until_retry(
                         exc, deadline, attempts, default_retry_delay=default_retry_delay
                     )

setup.py

@@ -44,18 +44,15 @@
     "proto-plus >= 1.22.2, <2.0.0; python_version>='3.11'",
     "protobuf>=3.20.2,<7.0.0,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
     "grpc-interceptor >= 0.15.4",
+    # Make OpenTelemetry a core dependency
+    "opentelemetry-api >= 1.22.0",
+    "opentelemetry-sdk >= 1.22.0",
+    "opentelemetry-semantic-conventions >= 0.43b0",
+    "opentelemetry-resourcedetector-gcp >= 1.8.0a0",
+    "google-cloud-monitoring >= 2.16.0",
+    "mmh3 >= 4.1.0 ",
 ]
-extras = {
-    "tracing": [
-        "opentelemetry-api >= 1.22.0",
-        "opentelemetry-sdk >= 1.22.0",
-        "opentelemetry-semantic-conventions >= 0.43b0",
-        "opentelemetry-resourcedetector-gcp >= 1.8.0a0",
-        "google-cloud-monitoring >= 2.16.0",
-        "mmh3 >= 4.1.0 ",
-    ],
-    "libcst": "libcst >= 0.2.5",
-}
+extras = {"libcst": "libcst >= 0.2.5"}
 
 url = "https://github.com/googleapis/python-spanner"