[receiver/opencensus] refactor the code for maintenance and lifecycle tests (#31648)

**Description:**
Simplify the code of the opencensus receiver to make it more
maintainable, reduce leaks and pass lifecycle tests.

**Link to tracking Issue:**
Fixes #31643

Author: atoulme

.chloggen/opencensusreceiver_lifecycle.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: opencensusreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Refactor the opencensusreceiver to pass lifecycle tests and avoid leaking gRPC connections.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [31643]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

receiver/opencensusreceiver/factory.go

@@ -47,16 +47,10 @@ func createTracesReceiver(
 	cfg component.Config,
 	nextConsumer consumer.Traces,
 ) (receiver.Traces, error) {
-	var err error
 	r := receivers.GetOrAdd(cfg, func() component.Component {
 		rCfg := cfg.(*Config)
-		var recv *ocReceiver
-		recv, err = newOpenCensusReceiver(string(rCfg.NetAddr.Transport), rCfg.NetAddr.Endpoint, nil, nil, set, rCfg.buildOptions()...)
-		return recv
+		return newOpenCensusReceiver(rCfg, nil, nil, set, rCfg.buildOptions()...)
 	})
-	if err != nil {
-		return nil, err
-	}
 	r.Unwrap().(*ocReceiver).traceConsumer = nextConsumer
 
 	return r, nil
@@ -68,16 +62,10 @@ func createMetricsReceiver(
 	cfg component.Config,
 	nextConsumer consumer.Metrics,
 ) (receiver.Metrics, error) {
-	var err error
 	r := receivers.GetOrAdd(cfg, func() component.Component {
 		rCfg := cfg.(*Config)
-		var recv *ocReceiver
-		recv, err = newOpenCensusReceiver(string(rCfg.NetAddr.Transport), rCfg.NetAddr.Endpoint, nil, nil, set, rCfg.buildOptions()...)
-		return recv
+		return newOpenCensusReceiver(rCfg, nil, nil, set, rCfg.buildOptions()...)
 	})
-	if err != nil {
-		return nil, err
-	}
 	r.Unwrap().(*ocReceiver).metricsConsumer = nextConsumer
 
 	return r, nil

receiver/opencensusreceiver/factory_test.go

@@ -86,14 +86,12 @@ func TestCreateTracesReceiver(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			tr, err := createTracesReceiver(ctx, set, tt.cfg, consumertest.NewNop())
+			require.NoError(t, err)
+			err = tr.Start(context.Background(), componenttest.NewNopHost())
 			if (err != nil) != tt.wantErr {
 				t.Errorf("factory.CreateTracesReceiver() error = %v, wantErr %v", err, tt.wantErr)
-				return
-			}
-			if tr != nil {
-				require.NoError(t, tr.Start(context.Background(), componenttest.NewNopHost()))
-				require.NoError(t, tr.Shutdown(context.Background()))
 			}
+			require.NoError(t, tr.Shutdown(context.Background()))
 		})
 	}
 }
@@ -152,14 +150,15 @@ func TestCreateMetricsReceiver(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			tc, err := createMetricsReceiver(context.Background(), set, tt.cfg, consumertest.NewNop())
+			require.NoError(t, err)
+			err = tc.Start(context.Background(), componenttest.NewNopHost())
+			defer func() {
+				require.NoError(t, tc.Shutdown(context.Background()))
+			}()
 			if (err != nil) != tt.wantErr {
 				t.Errorf("factory.CreateMetricsReceiver() error = %v, wantErr %v", err, tt.wantErr)
 				return
 			}
-			if tc != nil {
-				require.NoError(t, tc.Start(context.Background(), componenttest.NewNopHost()))
-				require.NoError(t, tc.Shutdown(context.Background()))
-			}
 		})
 	}
 }

receiver/opencensusreceiver/generated_component_test.go

@@ -357,11 +357,8 @@ func ocReceiverOnGRPCServer(t *testing.T, sr consumer.Metrics, set receiver.Crea
 	ln, err := net.Listen("tcp", "localhost:")
 	require.NoError(t, err, "Failed to find an available address to run the gRPC server: %v", err)
 
-	doneFnList := []func(){func() { ln.Close() }}
 	done := func() {
-		for _, doneFn := range doneFnList {
-			doneFn()
-		}
+		_ = ln.Close()
 	}
 
 	oci, err := New(sr, set)

receiver/opencensusreceiver/internal/ocmetrics/opencensus_test.go

@@ -13,7 +13,4 @@ status:
   - redhat
   - sumo
   codeowners:
-    active: [open-telemetry/collector-approvers]
-tests:
-  config:
-  skip_lifecycle: true
+    active: [open-telemetry/collector-approvers]