Fail on dirty and/or non-exact versions on master (#79)

* Fail on dirty and/or non-exact versions on master

Signed-off-by: Alexey Ermakov <alexey.ermakov@zalando.de>

* Prevent go from modifying go.mod

Signed-off-by: Alexey Ermakov <alexey.ermakov@zalando.de>

* Fix go.mod version

Signed-off-by: Alexey Ermakov <alexey.ermakov@zalando.de>

* Allow non-exact tag matches

Signed-off-by: Alexey Ermakov <alexey.ermakov@zalando.de>

README.md

@@ -172,6 +172,10 @@ kind: HorizontalPodAutoscaler
 metadata:
   name: myapp-hpa
   annotations:
+    # This annotation is optional.
+    # If specified, then this prometheus server is used,
+    # instead of the prometheus server specified as the CLI argument `--prometheus-server`.
+    metric-config.external.prometheus-query.prometheus/prometheus-server: http://prometheus.my-namespace.svc
     # metric-config.<metricType>.<metricName>.<collectorName>/<configKey>
     # <configKey> == query-name
     metric-config.external.prometheus-query.prometheus/processed-events-per-second: |

delivery.yaml

@@ -7,6 +7,8 @@ pipeline:
     - /go/pkg/mod       # pkg cache for Go modules
     - ~/.cache/go-build # Go build cache
   type: script
+  env:
+    GOFLAGS: "-mod=readonly"
   commands:
   - desc: test
     cmd: |
@@ -18,9 +20,11 @@ pipeline:
     cmd: |
       if [[ $CDP_TARGET_BRANCH == master && ! $CDP_PULL_REQUEST_NUMBER ]]; then
         IMAGE=registry-write.opensource.zalan.do/teapot/kube-metrics-adapter
-        VERSION=$(git describe --tags --always --dirty)
+        VERSION=$(git describe --tags --always)
       else
         IMAGE=registry-write.opensource.zalan.do/teapot/kube-metrics-adapter-test
         VERSION=$CDP_BUILD_VERSION
       fi
+      IMAGE=$IMAGE VERSION=$VERSION make build.docker
+      git diff --stat --exit-code
       IMAGE=$IMAGE VERSION=$VERSION make build.push

go.mod

@@ -89,3 +89,5 @@ require (
 	k8s.io/kube-openapi v0.0.0-20180731170545-e3762e86a74c // indirect
 	k8s.io/metrics v0.0.0-20190226180357-f3f09b9076d1
 )
+
+go 1.13

pkg/collector/aws_collector.go

@@ -56,11 +56,11 @@ func NewAWSSQSCollector(sessions map[string]*session.Session, config *MetricConf
 		return nil, fmt.Errorf("selector for queue is not specified")
 	}
 
-	name, ok := config.Metric.Selector.MatchLabels[sqsQueueNameLabelKey]
+	name, ok := config.Config[sqsQueueNameLabelKey]
 	if !ok {
 		return nil, fmt.Errorf("sqs queue name not specified on metric")
 	}
-	region, ok := config.Metric.Selector.MatchLabels[sqsQueueRegionLabelKey]
+	region, ok := config.Config[sqsQueueRegionLabelKey]
 	if !ok {
 		return nil, fmt.Errorf("sqs queue region is not specified on metric")
 	}

pkg/collector/collector.go

@@ -208,7 +208,9 @@ func ParseHPAMetrics(hpa *autoscalingv2.HorizontalPodAutoscaler) ([]*MetricConfi
 			Config:          map[string]string{},
 		}
 
-		if metric.Type == autoscalingv2.ExternalMetricSourceType {
+		if metric.Type == autoscalingv2.ExternalMetricSourceType &&
+			metric.External.Metric.Selector != nil &&
+			metric.External.Metric.Selector.MatchLabels != nil {
 			config.Config = metric.External.Metric.Selector.MatchLabels
 		}
 
@@ -217,7 +219,11 @@ func ParseHPAMetrics(hpa *autoscalingv2.HorizontalPodAutoscaler) ([]*MetricConfi
 			config.CollectorName = annotationConfigs.CollectorName
 			config.Interval = annotationConfigs.Interval
 			config.PerReplica = annotationConfigs.PerReplica
-			config.Config = annotationConfigs.Configs
+			// configs specified in annotations takes precedence
+			// over labels
+			for k, v := range annotationConfigs.Configs {
+				config.Config[k] = v
+			}
 		}
 		metricConfigs = append(metricConfigs, config)
 	}

pkg/collector/prometheus_collector.go

@@ -18,8 +18,9 @@ import (
 )
 
 const (
-	PrometheusMetricName        = "prometheus-query"
-	prometheusQueryNameLabelKey = "query-name"
+	PrometheusMetricName          = "prometheus-query"
+	prometheusQueryNameLabelKey   = "query-name"
+	prometheusServerAnnotationKey = "prometheus-server"
 )
 
 type NoResultError struct {
@@ -38,7 +39,7 @@ type PrometheusCollectorPlugin struct {
 func NewPrometheusCollectorPlugin(client kubernetes.Interface, prometheusServer string) (*PrometheusCollectorPlugin, error) {
 	cfg := api.Config{
 		Address:      prometheusServer,
-		RoundTripper: &http.Transport{},
+		RoundTripper: http.DefaultTransport,
 	}
 
 	promClient, err := api.NewClient(cfg)
@@ -90,7 +91,11 @@ func NewPrometheusCollector(client kubernetes.Interface, promAPI promv1.API, hpa
 			return nil, fmt.Errorf("no prometheus query defined")
 		}
 	case autoscalingv2.ExternalMetricSourceType:
-		queryName, ok := config.Metric.Selector.MatchLabels[prometheusQueryNameLabelKey]
+		if config.Metric.Selector == nil {
+			return nil, fmt.Errorf("selector for prometheus query is not specified")
+		}
+
+		queryName, ok := config.Config[prometheusQueryNameLabelKey]
 		if !ok {
 			return nil, fmt.Errorf("query name not specified on metric")
 		}
@@ -101,6 +106,20 @@ func NewPrometheusCollector(client kubernetes.Interface, promAPI promv1.API, hpa
 		} else {
 			return nil, fmt.Errorf("no prometheus query defined for metric")
 		}
+
+		// Use custom Prometheus URL if defined in HPA annotation.
+		if promServer, ok := config.Config[prometheusServerAnnotationKey]; ok {
+			cfg := api.Config{
+				Address:      promServer,
+				RoundTripper: http.DefaultTransport,
+			}
+
+			promClient, err := api.NewClient(cfg)
+			if err != nil {
+				return nil, err
+			}
+			c.promAPI = promv1.NewAPI(promClient)
+		}
 	}
 
 	return c, nil

pkg/collector/skipper_collector.go

@@ -2,6 +2,7 @@ package collector
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"math"
 	"strings"
@@ -20,6 +21,10 @@ const (
 	rpsMetricBackendSeparator = ","
 )
 
+var (
+	errBackendNameMissing = errors.New("backend name must be specified for requests-per-second when traffic switching is used")
+)
+
 // SkipperCollectorPlugin is a collector plugin for initializing metrics
 // collectors for getting skipper ingress metrics.
 type SkipperCollectorPlugin struct {
@@ -94,7 +99,7 @@ func getAnnotationWeight(backendWeights string, backend string) float64 {
 	return 0
 }
 
-func getWeights(ingressAnnotations map[string]string, backendAnnotations []string, backend string) float64 {
+func getWeights(ingressAnnotations map[string]string, backendAnnotations []string, backend string) (float64, error) {
 	maxWeight := 0.0
 	annotationsPresent := false
 
@@ -107,10 +112,15 @@ func getWeights(ingressAnnotations map[string]string, backendAnnotations []strin
 
 	// Fallback for ingresses that don't use traffic switching
 	if !annotationsPresent {
-		return 1.0
+		return 1.0, nil
 	}
 
-	return maxWeight
+	// Require backend name here
+	if backend != "" {
+		return maxWeight, nil
+	}
+
+	return 0.0, errBackendNameMissing
 }
 
 // getCollector returns a collector for getting the metrics.
@@ -120,7 +130,10 @@ func (c *SkipperCollector) getCollector() (Collector, error) {
 		return nil, err
 	}
 
-	backendWeight := getWeights(ingress.Annotations, c.backendAnnotations, c.backend)
+	backendWeight, err := getWeights(ingress.Annotations, c.backendAnnotations, c.backend)
+	if err != nil {
+		return nil, err
+	}
 	config := c.config
 
 	var collector Collector

pkg/collector/skipper_collector_test.go

@@ -106,6 +106,7 @@ func TestSkipperCollector(t *testing.T) {
 		backend            string
 		ingressName        string
 		collectedMetric    int
+		expectError        bool
 		namespace          string
 		backendWeights     map[string]map[string]int
 		replicas           int32
@@ -197,6 +198,30 @@ func TestSkipperCollector(t *testing.T) {
 			readyReplicas:      1,
 			backendAnnotations: []string{testBackendWeightsAnnotation},
 		},
+		{
+			msg:                "test annotations are set but backend is missing",
+			metrics:            []int{100, 1500, 700},
+			ingressName:        "dummy-ingress",
+			expectError:        true,
+			namespace:          "default",
+			backend:            "",
+			backendWeights:     map[string]map[string]int{testBackendWeightsAnnotation: {"backend2": 100, "backend1": 0}},
+			replicas:           1,
+			readyReplicas:      1,
+			backendAnnotations: []string{testBackendWeightsAnnotation},
+		},
+		{
+			msg:                "test annotations are missing and backend is unset",
+			metrics:            []int{100, 1500, 700},
+			ingressName:        "dummy-ingress",
+			collectedMetric:    1500,
+			namespace:          "default",
+			backend:            "",
+			backendWeights:     nil,
+			replicas:           1,
+			readyReplicas:      1,
+			backendAnnotations: []string{testBackendWeightsAnnotation},
+		},
 		{
 			msg:             "test partial backend annotations",
 			metrics:         []int{100, 1500, 700},
@@ -225,9 +250,13 @@ func TestSkipperCollector(t *testing.T) {
 			collector, err := NewSkipperCollector(client, plugin, hpa, config, time.Minute, tc.backendAnnotations, tc.backend)
 			require.NoError(t, err, "failed to create skipper collector: %v", err)
 			collected, err := collector.GetMetrics()
-			require.NoError(t, err, "failed to collect metrics: %v", err)
-			require.Len(t, collected, 1, "the number of metrics returned is not 1")
-			require.EqualValues(t, tc.collectedMetric, collected[0].Custom.Value.Value(), "the returned metric is not expected value")
+			if tc.expectError {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err, "failed to collect metrics: %v", err)
+				require.Len(t, collected, 1, "the number of metrics returned is not 1")
+				require.EqualValues(t, tc.collectedMetric, collected[0].Custom.Value.Value(), "the returned metric is not expected value")
+			}
 		})
 	}
 }

pkg/collector/zmon_collector.go

@@ -44,11 +44,7 @@ func NewZMONCollectorPlugin(zmon zmon.ZMON) (*ZMONCollectorPlugin, error) {
 func (c *ZMONCollectorPlugin) NewCollector(hpa *autoscalingv2.HorizontalPodAutoscaler, config *MetricConfig, interval time.Duration) (Collector, error) {
 	switch config.Metric.Name {
 	case ZMONCheckMetric:
-		annotations := map[string]string{}
-		if hpa != nil {
-			annotations = hpa.Annotations
-		}
-		return NewZMONCollector(c.zmon, config, annotations, interval)
+		return NewZMONCollector(c.zmon, config, interval)
 	}
 
 	return nil, fmt.Errorf("metric '%s' not supported", config.Metric.Name)
@@ -68,7 +64,11 @@ type ZMONCollector struct {
 }
 
 // NewZMONCollector initializes a new ZMONCollector.
-func NewZMONCollector(zmon zmon.ZMON, config *MetricConfig, annotations map[string]string, interval time.Duration) (*ZMONCollector, error) {
+func NewZMONCollector(zmon zmon.ZMON, config *MetricConfig, interval time.Duration) (*ZMONCollector, error) {
+	if config.Metric.Selector == nil {
+		return nil, fmt.Errorf("selector for zmon-check is not specified")
+	}
+
 	checkIDStr, ok := config.Config[zmonCheckIDLabelKey]
 	if !ok {
 		return nil, fmt.Errorf("ZMON check ID not specified on metric")
@@ -86,11 +86,6 @@ func NewZMONCollector(zmon zmon.ZMON, config *MetricConfig, annotations map[stri
 		key = k
 	}
 
-	// annotations takes precedence over label
-	if k, ok := annotations[zmonKeyAnnotationKey]; ok {
-		key = k
-	}
-
 	duration := defaultQueryDuration
 
 	// parse optional duration value
@@ -110,16 +105,6 @@ func NewZMONCollector(zmon zmon.ZMON, config *MetricConfig, annotations map[stri
 		}
 	}
 
-	// parse tags from annotations
-	// tags defined in annotations takes precedence over tags defined in
-	// the labels.
-	for k, v := range annotations {
-		if strings.HasPrefix(k, zmonTagPrefixAnnotationKey) {
-			key := strings.TrimPrefix(k, zmonTagPrefixAnnotationKey)
-			tags[key] = v
-		}
-	}
-
 	// default aggregator is last
 	aggregators := []string{"last"}
 	if k, ok := config.Config[zmonAggregatorsLabelKey]; ok {

pkg/collector/zmon_collector_test.go

@@ -50,20 +50,6 @@ func TestZMONCollectorNewCollector(t *testing.T) {
 	require.Equal(t, []string{"max"}, zmonCollector.aggregators)
 	require.Equal(t, map[string]string{"alias": "cluster_alias"}, zmonCollector.tags)
 
-	// check that annotations overwrites labels
-	hpa.ObjectMeta = metav1.ObjectMeta{
-		Annotations: map[string]string{
-			zmonKeyAnnotationKey:                 "annotation_key",
-			zmonTagPrefixAnnotationKey + "alias": "cluster_alias_annotation",
-		},
-	}
-	collector, err = collectPlugin.NewCollector(hpa, config, 1*time.Second)
-	require.NoError(t, err)
-	require.NotNil(t, collector)
-	zmonCollector = collector.(*ZMONCollector)
-	require.Equal(t, "annotation_key", zmonCollector.key)
-	require.Equal(t, map[string]string{"alias": "cluster_alias_annotation"}, zmonCollector.tags)
-
 	// should fail if the metric name isn't ZMON
 	config.Metric = newMetricIdentifier("non-zmon-check")
 	_, err = collectPlugin.NewCollector(nil, config, 1*time.Second)
@@ -131,7 +117,7 @@ func TestZMONCollectorGetMetrics(tt *testing.T) {
 				dataPoints: ti.dataPoints,
 			}
 
-			zmonCollector, err := NewZMONCollector(z, config, nil, 1*time.Second)
+			zmonCollector, err := NewZMONCollector(z, config, 1*time.Second)
 			require.NoError(t, err)
 
 			metrics, _ := zmonCollector.GetMetrics()