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4fabd50799
This change exposes the gateway metrics with an exporter which implements the Collector interface of prometheus. This change Fixes #697 Signed-off-by: Ken Fukuyama <kenfdev@gmail.com>
89 lines
2.8 KiB
Go
89 lines
2.8 KiB
Go
package metrics
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import (
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"testing"
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"github.com/openfaas/faas/gateway/requests"
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"github.com/prometheus/client_golang/prometheus"
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dto "github.com/prometheus/client_model/go"
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)
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type metricResult struct {
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value float64
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labels map[string]string
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}
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func labels2Map(labels []*dto.LabelPair) map[string]string {
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res := map[string]string{}
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for _, l := range labels {
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res[l.GetName()] = l.GetValue()
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}
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return res
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}
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func readGauge(g prometheus.Metric) metricResult {
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m := &dto.Metric{}
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g.Write(m)
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return metricResult{
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value: m.GetGauge().GetValue(),
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labels: labels2Map(m.GetLabel()),
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}
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}
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func Test_Describe_DescribesThePrometheusMetrics(t *testing.T) {
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metricsOptions := BuildMetricsOptions()
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exporter := NewExporter(metricsOptions)
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ch := make(chan *prometheus.Desc)
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defer close(ch)
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go exporter.Describe(ch)
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d := (<-ch)
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expectedGatewayFunctionInvocationDesc := `Desc{fqName: "gateway_function_invocation_total", help: "Individual function metrics", constLabels: {}, variableLabels: [function_name code]}`
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actualGatewayFunctionInvocationDesc := d.String()
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if expectedGatewayFunctionInvocationDesc != actualGatewayFunctionInvocationDesc {
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t.Errorf("Want %s, got: %s", expectedGatewayFunctionInvocationDesc, actualGatewayFunctionInvocationDesc)
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}
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d = (<-ch)
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expectedGatewayFunctionsHistogramDesc := `Desc{fqName: "gateway_functions_seconds", help: "Function time taken", constLabels: {}, variableLabels: [function_name]}`
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actualGatewayFunctionsHistogramDesc := d.String()
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if expectedGatewayFunctionsHistogramDesc != actualGatewayFunctionsHistogramDesc {
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t.Errorf("Want %s, got: %s", expectedGatewayFunctionsHistogramDesc, actualGatewayFunctionsHistogramDesc)
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}
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d = (<-ch)
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expectedServiceReplicasCounterDesc := `Desc{fqName: "gateway_service_count", help: "Docker service replicas", constLabels: {}, variableLabels: [function_name]}`
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actualServiceReplicasCounterDesc := d.String()
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if expectedServiceReplicasCounterDesc != actualServiceReplicasCounterDesc {
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t.Errorf("Want %s, got: %s", expectedServiceReplicasCounterDesc, actualServiceReplicasCounterDesc)
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}
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}
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func Test_Collect_CollectsTheNumberOfReplicasOfAService(t *testing.T) {
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metricsOptions := BuildMetricsOptions()
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exporter := NewExporter(metricsOptions)
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expectedService := requests.Function{
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Name: "function_with_two_replica",
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Replicas: 2,
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}
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exporter.services = []requests.Function{expectedService}
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ch := make(chan prometheus.Metric)
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defer close(ch)
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go exporter.Collect(ch)
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g := (<-ch).(prometheus.Gauge)
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result := readGauge(g)
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if expectedService.Name != result.labels["function_name"] {
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t.Errorf("Want %s, got %s", expectedService.Name, result.labels["function_name"])
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}
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expectedReplicas := float64(expectedService.Replicas)
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if expectedReplicas != result.value {
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t.Errorf("Want %f, got %f", expectedReplicas, result.value)
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}
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}
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