Remove incorrect errors from SensorNameFilter

This commit reorganizes the logic in parseMetric to have it take in a MetricConfig so that the extractor can find the config and properly handle the case when there's no config found.

pkg/metrics/extractor.go

@@ -1,7 +1,6 @@
 package metrics
 
 import (
-	"errors"
 	"fmt"
 
 	"github.com/hikhvar/mqtt2prometheus/pkg/config"
@@ -21,7 +20,14 @@ func NewJSONObjectExtractor(p Parser) Extractor {
 			if rawValue == nil {
 				continue
 			}
-			m, err := p.parseMetric(path, deviceID, rawValue)
+
+			// Find a valid metrics config
+			config, found := p.findMetricConfig(path, deviceID)
+			if !found {
+				continue
+			}
+
+			m, err := p.parseMetric(config, rawValue)
 			if err != nil {
 				return nil, fmt.Errorf("failed to parse valid metric value: %w", err)
 			}
@@ -32,17 +38,21 @@ func NewJSONObjectExtractor(p Parser) Extractor {
 	}
 }
 
-func NewMetricPerTopicExtractor(p Parser, metricName *config.Regexp) Extractor {
+func NewMetricPerTopicExtractor(p Parser, metricNameRegex *config.Regexp) Extractor {
 	return func(topic string, payload []byte, deviceID string) (MetricCollection, error) {
-		mName := metricName.GroupValue(topic, config.MetricNameRegexGroup)
+		metricName := metricNameRegex.GroupValue(topic, config.MetricNameRegexGroup)
-		if mName == "" {
+		if metricName == "" {
 			return nil, fmt.Errorf("failed to find valid metric in topic path")
 		}
-		m, err := p.parseMetric(mName, deviceID, string(payload))
+
+		// Find a valid metrics config
+		config, found := p.findMetricConfig(metricName, deviceID)
+		if !found {
+			return nil, nil
+		}
+
+		m, err := p.parseMetric(config, string(payload))
 		if err != nil {
-			if errors.Is(err, metricNotConfigured) {
-				return nil, nil
-			}
 			return nil, fmt.Errorf("failed to parse metric: %w", err)
 		}
 		m.Topic = topic

pkg/metrics/extractor_test.go

@@ -25,6 +25,7 @@ func TestNewJSONObjectExtractor_parseMetric(t *testing.T) {
 		args      args
 		want      Metric
 		wantErr   bool
+		noValue   bool
 	}{
 		{
 			name:      "string value",
@@ -78,6 +79,55 @@ func TestNewJSONObjectExtractor_parseMetric(t *testing.T) {
 				IngestTime:  testNow(),
 				Topic:       "topic",
 			},
+		}, {
+			name:      "metric matching SensorNameFilter",
+			separator: ".",
+			fields: fields{
+				map[string][]config.MetricConfig{
+					"temperature": []config.MetricConfig{
+						{
+							PrometheusName:   "temperature",
+							MQTTName:         "temperature",
+							ValueType:        "gauge",
+							SensorNameFilter: *config.MustNewRegexp(".*22$"),
+						},
+					},
+				},
+			},
+			args: args{
+				metricPath: "topic",
+				deviceID:   "dht22",
+				value:      "{\"temperature\": 8.5}",
+			},
+			want: Metric{
+				Description: prometheus.NewDesc("temperature", "", []string{"sensor", "topic"}, nil),
+				ValueType:   prometheus.GaugeValue,
+				Value:       8.5,
+				IngestTime:  testNow(),
+				Topic:       "topic",
+			},
+		}, {
+			name:      "metric not matching SensorNameFilter",
+			separator: ".",
+			fields: fields{
+				map[string][]config.MetricConfig{
+					"temperature": []config.MetricConfig{
+						{
+							PrometheusName:   "temperature",
+							MQTTName:         "temperature",
+							ValueType:        "gauge",
+							SensorNameFilter: *config.MustNewRegexp(".*fail$"),
+						},
+					},
+				},
+			},
+			args: args{
+				metricPath: "topic",
+				deviceID:   "dht22",
+				value:      "{\"temperature\": 8.5}",
+			},
+			want:    Metric{},
+			noValue: true,
 		},
 	}
 	for _, tt := range tests {
@@ -93,10 +143,15 @@ func TestNewJSONObjectExtractor_parseMetric(t *testing.T) {
 				t.Errorf("parseMetric() error = %v, wantErr %v", err, tt.wantErr)
 				return
 			}
-			if len(got) != 1 {
+
-				t.Errorf("parseMetric() got = %v, want %v", nil, tt.want)
+			if len(got) == 0 {
+				if !tt.noValue {
+					t.Errorf("parseMetric() got = %v, want %v", nil, tt.want)
+				}
 			} else if !reflect.DeepEqual(got[0], tt.want) {
 				t.Errorf("parseMetric() got = %v, want %v", got[0], tt.want)
+			} else if len(got) > 1 {
+				t.Errorf("unexpected result got = %v, want %v", got, tt.want)
 			}
 		})
 	}

pkg/metrics/parser.go

@@ -1,7 +1,6 @@
 package metrics
 
 import (
-	"errors"
 	"fmt"
 	"strconv"
 	"time"
@@ -9,12 +8,10 @@ import (
 	"github.com/hikhvar/mqtt2prometheus/pkg/config"
 )
 
-type metricNotConfiguredError error
-
-var metricNotConfigured metricNotConfiguredError = errors.New("metric not configured failed to parse")
-
 type Parser struct {
-	separator     string
+	separator string
+	// Maps the mqtt metric name to a list of configs
+	// The first that matches SensorNameFilter will be used
 	metricConfigs map[string][]config.MetricConfig
 }
 
@@ -39,7 +36,7 @@ func (p *Parser) config() map[string][]config.MetricConfig {
 
 // validMetric returns config matching the metric and deviceID
 // Second return value indicates if config was found.
-func (p *Parser) validMetric(metric string, deviceID string) (config.MetricConfig, bool) {
+func (p *Parser) findMetricConfig(metric string, deviceID string) (config.MetricConfig, bool) {
 	for _, c := range p.metricConfigs[metric] {
 		if c.SensorNameFilter.Match(deviceID) {
 			return c, true
@@ -50,12 +47,7 @@ func (p *Parser) validMetric(metric string, deviceID string) (config.MetricConfi
 
 // parseMetric parses the given value according to the given deviceID and metricPath. The config allows to
 // parse a metric value according to the device ID.
-func (p *Parser) parseMetric(metricPath string, deviceID string, value interface{}) (Metric, error) {
+func (p *Parser) parseMetric(cfg config.MetricConfig, value interface{}) (Metric, error) {
-	cfg, cfgFound := p.validMetric(metricPath, deviceID)
-	if !cfgFound {
-		return Metric{}, metricNotConfigured
-	}
-
 	var metricValue float64
 
 	if boolValue, ok := value.(bool); ok {

pkg/metrics/parser_test.go

@@ -411,7 +411,7 @@ func TestParser_parseMetric(t *testing.T) {
 			args: args{
 				metricPath: "enabled",
 				deviceID:   "dht22",
-				value:      metricNotConfigured,
+				value:      []int{3},
 			},
 			wantErr: true,
 		},
@@ -421,7 +421,17 @@ func TestParser_parseMetric(t *testing.T) {
 			p := &Parser{
 				metricConfigs: tt.fields.metricConfigs,
 			}
-			got, err := p.parseMetric(tt.args.metricPath, tt.args.deviceID, tt.args.value)
+
+			// Find a valid metrics config
+			config, found := p.findMetricConfig(tt.args.metricPath, tt.args.deviceID)
+			if !found {
+				if !tt.wantErr {
+					t.Errorf("MetricConfig not found")
+				}
+				return
+			}
+
+			got, err := p.parseMetric(config, tt.args.value)
 			if (err != nil) != tt.wantErr {
 				t.Errorf("parseMetric() error = %v, wantErr %v", err, tt.wantErr)
 				return