output/cloudv2: use a shared url for the client

output/cloud/expv2/flush.go

@@ -8,7 +8,7 @@ import (
 )
 
 type pusher interface {
-	push(referenceID string, samples *pbcloud.MetricSet) error
+	push(samples *pbcloud.MetricSet) error
 }
 
 type metricsFlusher struct {
@@ -46,7 +46,7 @@ func (f *metricsFlusher) flush(_ context.Context) error {
 		}
 
 		// we hit the chunk size, let's flush
-		err := f.client.push(f.referenceID, msb.MetricSet)
+		err := f.client.push(msb.MetricSet)
 		if err != nil {
 			return err
 		}
@@ -58,7 +58,7 @@ func (f *metricsFlusher) flush(_ context.Context) error {
 	}
 
 	// send the last (or the unique) MetricSet chunk to the remote service
-	return f.client.push(f.referenceID, msb.MetricSet)
+	return f.client.push(msb.MetricSet)
 }
 
 type metricSetBuilder struct {

output/cloud/expv2/flush_test.go

@@ -92,7 +92,7 @@ type pusherMock struct {
 	pushCalled int
 }
 
-func (pm *pusherMock) push(_ string, _ *pbcloud.MetricSet) error {
+func (pm *pusherMock) push(_ *pbcloud.MetricSet) error {
 	pm.pushCalled++
 	return nil
 }

output/cloud/expv2/metrics_client.go

@@ -21,41 +21,40 @@ import (
 // to the remote service.
 type metricsClient struct {
 	httpClient *cloudapi.Client
-	baseURL    string
+	url        string
 }
 
 // newMetricsClient creates and initializes a new MetricsClient.
-func newMetricsClient(c *cloudapi.Client) (*metricsClient, error) {
-	// Unfortunately, the cloudapi.Client works across different versions
-	// of the API, but it has the v1 harcoded so we need to trim the wrong path
+func newMetricsClient(c *cloudapi.Client, testRunID string) (*metricsClient, error) {
+	// The cloudapi.Client works across different versions of the API, the test
+	// lifecycle management is under /v1 instead the metrics ingestion is /v2.
+	// Unfortunately, the current client has v1 hard-coded so we need to trim the wrong path
 	// to be able to replace it with the correct one.
+	// A versioned client would be better but it would require a breaking change
+	// and considering that other services (e.g. k6-operator) depend on it,
+	// we want to stabilize the API before.
 	u := c.BaseURL()
 	if !strings.HasSuffix(u, "/v1") {
 		return nil, errors.New("a /v1 suffix is expected in the Cloud service's BaseURL path")
 	}
+	if testRunID == "" {
+		return nil, errors.New("TestRunID of the test is required")
+	}
 	return &metricsClient{
 		httpClient: c,
-		baseURL:    strings.TrimSuffix(u, "/v1") + "/v2/metrics/",
+		url:        strings.TrimSuffix(u, "/v1") + "/v2/metrics/" + testRunID,
 	}, nil
 }
 
 // Push the provided metrics for the given test run ID.
-func (mc *metricsClient) push(referenceID string, samples *pbcloud.MetricSet) error {
-	if referenceID == "" {
-		return errors.New("TestRunID of the test is required")
-	}
-
+func (mc *metricsClient) push(samples *pbcloud.MetricSet) error {
 	b, err := newRequestBody(samples)
 	if err != nil {
 		return err
 	}
 
-	// TODO: it is always the same
-	// we don't expect to share this client across different refID
-	// with a bit of effort we can find a way to just allocate once
-	url := mc.baseURL + referenceID
 	req, err := http.NewRequestWithContext(
-		context.Background(), http.MethodPost, url, io.NopCloser(bytes.NewReader(b)))
+		context.Background(), http.MethodPost, mc.url, io.NopCloser(bytes.NewReader(b)))
 	if err != nil {
 		return err
 	}

output/cloud/expv2/metrics_client_test.go

@@ -36,11 +36,11 @@ func TestMetricsClientPush(t *testing.T) {
 	defer ts.Close()
 
 	c := cloudapi.NewClient(nil, "fake-token", ts.URL, "k6cloud/v0.4", 1*time.Second)
-	mc, err := newMetricsClient(c)
+	mc, err := newMetricsClient(c, "test-ref-id")
 	require.NoError(t, err)
 
 	mset := pbcloud.MetricSet{}
-	err = mc.push("test-ref-id", &mset)
+	err = mc.push(&mset)
 	require.NoError(t, err)
 	assert.Equal(t, 1, reqs)
 }
@@ -55,9 +55,9 @@ func TestMetricsClientPushUnexpectedStatus(t *testing.T) {
 	defer ts.Close()
 
 	c := cloudapi.NewClient(nil, "fake-token", ts.URL, "k6cloud/v0.4", 1*time.Second)
-	mc, err := newMetricsClient(c)
+	mc, err := newMetricsClient(c, "test-ref-id")
 	require.NoError(t, err)
 
-	err = mc.push("test-ref-id", nil)
+	err = mc.push(nil)
 	assert.ErrorContains(t, err, "500 Internal Server Error")
 }

output/cloud/expv2/output.go

@@ -83,7 +83,7 @@ func (o *Output) Start() error {
 		return fmt.Errorf("failed to initialize the samples collector: %w", err)
 	}
 
-	mc, err := newMetricsClient(o.cloudClient)
+	mc, err := newMetricsClient(o.cloudClient, o.referenceID)
 	if err != nil {
 		return fmt.Errorf("failed to initialize the http metrics flush client: %w", err)
 	}

output/cloud/expv2/output_test.go

@@ -74,6 +74,8 @@ func TestOutputCollectSamples(t *testing.T) {
 		logger, conf.Token.String, conf.Host.String, "v/test", conf.Timeout.TimeDuration())
 	o, err := New(logger, conf, cc)
 	require.NoError(t, err)
+
+	o.SetReferenceID("ref-id-123")
 	require.NoError(t, o.Start())
 	require.Empty(t, o.collector.bq.PopAll())
 
@@ -286,6 +288,7 @@ func TestOutputStopWithTestError(t *testing.T) {
 	o, err := New(logger, config, cc)
 	require.NoError(t, err)
 
+	o.SetReferenceID("ref-id-123")
 	require.NoError(t, o.Start())
 	require.NoError(t, o.StopWithTestError(errors.New("an error")))
 }