Empty datapoints

[ymettier]

Hello,

I'm using cloudeye_exporter on FlexibleEngine (huawei cloud distributed by Orange in France).

When I try to retrieve metrics from SYS.OBS namespace, I have empty datapoints. After investigations, I noticed that the datapoints are not available in the interval [now - 5 minutes, now].

Below is a little quick'n dirty patch that I produced to prove my investigation :

diff -bruaN cloudeye-exporter.orig/collector/collector.go cloudeye-exporter/collector/collector.go
--- cloudeye-exporter.orig/collector/collector.go	2020-05-18 19:23:04.253169061 +0200
+++ cloudeye-exporter/collector/collector.go	2020-05-18 19:24:01.780775057 +0200
@@ -160,10 +160,11 @@
 
 func (exporter *BaseHuaweiCloudExporter) Collect(ch chan<- prometheus.Metric) {
 	periodm, _ := time.ParseDuration("-5m")
+	offsetm, _ := time.ParseDuration("-5m")
 
 	now := time.Now()
-	from := strconv.FormatInt(int64(now.Add(periodm).UnixNano()/1e6), 10)
-	to := strconv.FormatInt(int64(now.UnixNano()/1e6), 10)
+	from := strconv.FormatInt(int64(now.Add(offsetm).Add(periodm).UnixNano()/1e6), 10)
+	to := strconv.FormatInt(int64(now.Add(offsetm).UnixNano()/1e6), 10)
 	exporter.From = from
 	exporter.To = to

Without this patch : datapoints are empty.

With this patch, I get metrics.

I will soon provide a Pull Request with a better fix.