mdatagen: Add Init function for intializing existing metrics (open-te…

…lemetry#2358) * mdatagen: Add Init function for intiializing existing metrics pdata.Metric instances may already be initialized and we just want to fill in the metric descriptor values. Removes the unnecessary need to New() then CopyTo(). * regenerate Co-authored-by: Bogdan Drutu <bogdandrutu@gmail.com>
jpkrohling · Jan 13, 2021 · 8b04bef · 8b04bef
1 parent 0852610
commit 8b04bef
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Showing 5 changed files with 31 additions and 19 deletions.
diff --git a/cmd/mdatagen/metrics.tmpl b/cmd/mdatagen/metrics.tmpl
@@ -27,20 +27,30 @@ const Type configmodels.Type = "{{ .Name }}"
 type metricIntf interface {
 	Name() string
 	New() pdata.Metric
+	Init(metric pdata.Metric)
 }
 
 // Intentionally not exposing this so that it is opaque and can change freely.
 type metricImpl struct {
 	name string
-	newFunc func() pdata.Metric
+	initFunc func(pdata.Metric)
 }
 
+// Name returns the metric name.
 func (m *metricImpl) Name() string {
 	return m.name
 }
 
+// New creates a metric object preinitialized.
 func (m *metricImpl) New() pdata.Metric {
-	return m.newFunc()
+	metric := pdata.NewMetric()
+	m.Init(metric)
+	return metric
+}
+
+// Init initializes the provided metric object.
+func (m *metricImpl) Init(metric pdata.Metric) {
+	m.initFunc(metric)
 }
 
 type metricStruct struct {
@@ -84,8 +94,7 @@ var Metrics = &metricStruct{
 	{{- range $name, $metric := .Metrics }}
 	&metricImpl{
 		"{{ $name }}",
-		func() pdata.Metric {
-			metric := pdata.NewMetric()
+		func(metric pdata.Metric) {
 			metric.SetName("{{ $name }}")
 			metric.SetDescription("{{ $metric.Description }}")
 			metric.SetUnit("{{ $metric.Unit }}")
@@ -96,8 +105,6 @@ var Metrics = &metricStruct{
 			{{- if $metric.Data.HasAggregated }}
 			metric.{{ $metric.Data.Type }}().SetAggregationTemporality({{ $metric.Data.Aggregated.Type }})
 			{{- end }}
-
-			return metric
 		},
 	},
 	{{- end }}

diff --git a/internal/tools/go.sum b/internal/tools/go.sum
@@ -182,6 +182,7 @@ github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
 github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
 github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
+github.com/gookit/color v1.3.1 h1:PPD/C7sf8u2L8XQPdPgsWRoAiLQGZEZOzU3cf5IYYUk=
 github.com/gookit/color v1.3.1/go.mod h1:R3ogXq2B9rTbXoSHJ1HyUVAZ3poOJHpd9nQmyGZsfvQ=
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1 h1:EGx4pi6eqNxGaHF6qqu48+N2wcFQ5qg5FXgOdqsJ5d8=
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=

diff --git a/receiver/hostmetricsreceiver/internal/metadata/generated_metrics.go b/receiver/hostmetricsreceiver/internal/metadata/generated_metrics.go
diff --git a/receiver/hostmetricsreceiver/internal/scraper/cpuscraper/cpu_scraper.go b/receiver/hostmetricsreceiver/internal/scraper/cpuscraper/cpu_scraper.go
@@ -70,7 +70,7 @@ func (s *scraper) scrape(_ context.Context) (pdata.MetricSlice, error) {
 }
 
 func initializeCPUTimeMetric(metric pdata.Metric, startTime, now pdata.TimestampUnixNano, cpuTimes []cpu.TimesStat) {
-	metadata.Metrics.SystemCPUTime.New().CopyTo(metric)
+	metadata.Metrics.SystemCPUTime.Init(metric)
 
 	ddps := metric.DoubleSum().DataPoints()
 	ddps.Resize(len(cpuTimes) * cpuStatesLen)

diff --git a/receiver/hostmetricsreceiver/internal/scraper/memoryscraper/memory_scraper.go b/receiver/hostmetricsreceiver/internal/scraper/memoryscraper/memory_scraper.go
@@ -57,7 +57,7 @@ func (s *scraper) Scrape(_ context.Context) (pdata.MetricSlice, error) {
 }
 
 func initializeMemoryUsageMetric(metric pdata.Metric, now pdata.TimestampUnixNano, memInfo *mem.VirtualMemoryStat) {
-	metadata.Metrics.SystemMemoryUsage.New().CopyTo(metric)
+	metadata.Metrics.SystemMemoryUsage.Init(metric)
 
 	idps := metric.IntSum().DataPoints()
 	idps.Resize(memStatesLen)