Add aws environments to the statistics

but only with the field usedRunners.

internal/environment/abstract_manager.go

@@ -59,5 +59,13 @@ func (n *AbstractManager) Delete(id dto.EnvironmentID) (bool, error) {
 }
 
 func (n *AbstractManager) Statistics() map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData {
-	return map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData{}
+	if n.runnerManager == nil {
+		return map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData{}
+	}
+
+	statistics := n.NextHandler().Statistics()
+	for k, v := range n.runnerManager.EnvironmentStatistics() {
+		statistics[k] = v
+	}
+	return statistics
 }

internal/environment/aws_environment.go

@@ -59,6 +59,11 @@ func (a *AWSEnvironment) Sample() (r runner.Runner, ok bool) {
 
 // The following methods are not supported at this moment.
 
+// IdleRunnerCount is not supported as we have no information about the AWS managed prewarming pool.
+func (a *AWSEnvironment) IdleRunnerCount() int {
+	return 0
+}
+
 // PrewarmingPoolSize is neither supported nor required. It is handled transparently by AWS.
 func (a *AWSEnvironment) PrewarmingPoolSize() uint {
 	return 0
@@ -111,7 +116,3 @@ func (a *AWSEnvironment) AddRunner(_ runner.Runner) {
 func (a *AWSEnvironment) DeleteRunner(_ string) {
 	panic("not supported")
 }
-
-func (a *AWSEnvironment) IdleRunnerCount() int {
-	panic("not supported")
-}

internal/environment/aws_manager.go

@@ -67,7 +67,3 @@ func isAWSEnvironment(request dto.ExecutionEnvironmentRequest) bool {
 	}
 	return false
 }
-
-func (a *AWSEnvironmentManager) Statistics() map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData {
-	return a.NextHandler().Statistics()
-}

internal/environment/nomad_manager.go

@@ -120,10 +120,6 @@ func (m *NomadEnvironmentManager) CreateOrUpdate(id dto.EnvironmentID, request d
 	return !isExistingEnvironment, nil
 }
 
-func (m *NomadEnvironmentManager) Statistics() map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData {
-	return m.runnerManager.EnvironmentStatistics()
-}
-
 func (m *NomadEnvironmentManager) Load() error {
 	templateJobs, err := m.api.LoadEnvironmentJobs()
 	if err != nil {

internal/runner/abstract_manager.go

@@ -58,7 +58,17 @@ func (n *AbstractManager) DeleteEnvironment(id dto.EnvironmentID) {
 }
 
 func (n *AbstractManager) EnvironmentStatistics() map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData {
-	return map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData{}
+	environments := make(map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData)
+	for _, e := range n.environments.List() {
+		environments[e.ID()] = &dto.StatisticalExecutionEnvironmentData{
+			ID:                 int(e.ID()),
+			PrewarmingPoolSize: e.PrewarmingPoolSize(),
+			IdleRunners:        uint(e.IdleRunnerCount()),
+			UsedRunners:        0,
+		}
+	}
+
+	return environments
 }
 
 func (n *AbstractManager) Claim(_ dto.EnvironmentID, _ int) (Runner, error) {

internal/runner/aws_manager.go

@@ -45,3 +45,22 @@ func (a AWSRunnerManager) Return(r Runner) error {
 	}
 	return nil
 }
+
+// EnvironmentStatistics returns only the used runner for each environment as the prewarming is handled
+// by AWS transparently.
+func (a AWSRunnerManager) EnvironmentStatistics() map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData {
+	environments := a.AbstractManager.EnvironmentStatistics()
+
+	for _, r := range a.usedRunners.List() {
+		workload, isAWSRunner := r.(*AWSFunctionWorkload)
+		if !isAWSRunner {
+			log.WithField("workload", workload).Error("Stored runners must be AWS runner")
+			continue
+		}
+
+		environmentID := workload.environment.ID()
+		environments[environmentID].UsedRunners++
+	}
+
+	return environments
+}

internal/runner/nomad_manager.go

@@ -35,15 +35,7 @@ func NewNomadRunnerManager(apiClient nomad.ExecutorAPI, ctx context.Context) *No
 }
 
 func (m *NomadRunnerManager) EnvironmentStatistics() map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData {
-	environments := make(map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData)
+	environments := m.AbstractManager.EnvironmentStatistics()
-	for _, e := range m.environments.List() {
-		environments[e.ID()] = &dto.StatisticalExecutionEnvironmentData{
-			ID:                 int(e.ID()),
-			PrewarmingPoolSize: e.PrewarmingPoolSize(),
-			IdleRunners:        uint(e.IdleRunnerCount()),
-			UsedRunners:        0,
-		}
-	}
 
 	for _, r := range m.usedRunners.List() {
 		id, err := nomad.EnvironmentIDFromRunnerID(r.ID())