Sampling Feature for archived and fresh data

internal/metricdata/metricdata.go

@@ -15,6 +15,7 @@ import (
 	"github.com/ClusterCockpit/cc-backend/pkg/archive"
 	"github.com/ClusterCockpit/cc-backend/pkg/log"
 	"github.com/ClusterCockpit/cc-backend/pkg/lrucache"
+	"github.com/ClusterCockpit/cc-backend/pkg/resampler"
 	"github.com/ClusterCockpit/cc-backend/pkg/schema"
 )
 
@@ -24,7 +25,7 @@ type MetricDataRepository interface {
 	Init(rawConfig json.RawMessage) error
 
 	// Return the JobData for the given job, only with the requested metrics.
-	LoadData(job *schema.Job, metrics []string, scopes []schema.MetricScope, ctx context.Context) (schema.JobData, error)
+	LoadData(job *schema.Job, metrics []string, scopes []schema.MetricScope, ctx context.Context, resolution int) (schema.JobData, error)
 
 	// Return a map of metrics to a map of nodes to the metric statistics of the job. node scope assumed for now.
 	LoadStats(job *schema.Job, metrics []string, ctx context.Context) (map[string]map[string]schema.MetricStatistics, error)
@@ -80,8 +81,9 @@ func LoadData(job *schema.Job,
 	metrics []string,
 	scopes []schema.MetricScope,
 	ctx context.Context,
+	resolution int,
 ) (schema.JobData, error) {
-	data := cache.Get(cacheKey(job, metrics, scopes), func() (_ interface{}, ttl time.Duration, size int) {
+	data := cache.Get(cacheKey(job, metrics, scopes, resolution), func() (_ interface{}, ttl time.Duration, size int) {
 		var jd schema.JobData
 		var err error
 
@@ -106,7 +108,7 @@ func LoadData(job *schema.Job,
 				}
 			}
 
-			jd, err = repo.LoadData(job, metrics, scopes, ctx)
+			jd, err = repo.LoadData(job, metrics, scopes, ctx, resolution)
 			if err != nil {
 				if len(jd) != 0 {
 					log.Warnf("partial error: %s", err.Error())
@@ -118,12 +120,31 @@ func LoadData(job *schema.Job,
 			}
 			size = jd.Size()
 		} else {
-			jd, err = archive.GetHandle().LoadJobData(job)
+			var jd_temp schema.JobData
+			jd_temp, err = archive.GetHandle().LoadJobData(job)
 			if err != nil {
 				log.Error("Error while loading job data from archive")
 				return err, 0, 0
 			}
 
+			//Deep copy the cached arhive hashmap
+			jd = DeepCopy(jd_temp)
+
+			//Resampling for archived data.
+			//Pass the resolution from frontend here.
+			for _, v := range jd {
+				for _, v_ := range v {
+					timestep := 0
+					for i := 0; i < len(v_.Series); i += 1 {
+						v_.Series[i].Data, timestep, err = resampler.LargestTriangleThreeBucket(v_.Series[i].Data, v_.Timestep, resolution)
+						if err != nil {
+							return err, 0, 0
+						}
+					}
+					v_.Timestep = timestep
+				}
+			}
+
 			// Avoid sending unrequested data to the client:
 			if metrics != nil || scopes != nil {
 				if metrics == nil {
@@ -254,11 +275,12 @@ func cacheKey(
 	job *schema.Job,
 	metrics []string,
 	scopes []schema.MetricScope,
+	resolution int,
 ) string {
 	// Duration and StartTime do not need to be in the cache key as StartTime is less unique than
 	// job.ID and the TTL of the cache entry makes sure it does not stay there forever.
-	return fmt.Sprintf("%d(%s):[%v],[%v]",
-		job.ID, job.State, metrics, scopes)
+	return fmt.Sprintf("%d(%s):[%v],[%v]-%d",
+		job.ID, job.State, metrics, scopes, resolution)
 }
 
 // For /monitoring/job/<job> and some other places, flops_any and mem_bw need
@@ -297,8 +319,11 @@ func prepareJobData(
 func ArchiveJob(job *schema.Job, ctx context.Context) (*schema.JobMeta, error) {
 	allMetrics := make([]string, 0)
 	metricConfigs := archive.GetCluster(job.Cluster).MetricConfig
+	resolution := 0
+
 	for _, mc := range metricConfigs {
 		allMetrics = append(allMetrics, mc.Name)
+		resolution = mc.Timestep
 	}
 
 	// TODO: Talk about this! What resolutions to store data at...
@@ -311,7 +336,7 @@ func ArchiveJob(job *schema.Job, ctx context.Context) (*schema.JobMeta, error) {
 		scopes = append(scopes, schema.MetricScopeAccelerator)
 	}
 
-	jobData, err := LoadData(job, allMetrics, scopes, ctx)
+	jobData, err := LoadData(job, allMetrics, scopes, ctx, resolution)
 	if err != nil {
 		log.Error("Error wile loading job data for archiving")
 		return nil, err