Add statistics route for execution environments

* Add statistics route for execution environments

* Add maximum to port api definition

Co-authored-by: Sebastian Serth <MrSerth@users.noreply.github.com>

internal/environment/environment.go

@@ -254,6 +254,10 @@ func (n *NomadEnvironment) DeleteRunner(id string) {
 	n.idleRunners.Delete(id)
 }
 
+func (n *NomadEnvironment) IdleRunnerCount() int {
+	return n.idleRunners.Length()
+}
+
 // MarshalJSON implements the json.Marshaler interface.
 // This converts the NomadEnvironment into the expected schema for dto.ExecutionEnvironmentData.
 func (n *NomadEnvironment) MarshalJSON() (res []byte, err error) {

internal/environment/manager.go

@@ -44,6 +44,9 @@ type Manager interface {
 	// Delete removes the specified execution environment.
 	// Iff the specified environment could not be found Delete returns false.
 	Delete(id dto.EnvironmentID) (bool, error)
+
+	// Statistics returns statistical data for each execution environment.
+	Statistics() map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData
 }
 
 type NomadEnvironmentManager struct {
@@ -156,6 +159,10 @@ func (m *NomadEnvironmentManager) Delete(id dto.EnvironmentID) (bool, error) {
 	return true, 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/environment/manager_mock.go

@@ -115,3 +115,19 @@ func (_m *ManagerMock) Load() error {
 
 	return r0
 }
+
+// Statistics provides a mock function with given fields:
+func (_m *ManagerMock) Statistics() map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData {
+	ret := _m.Called()
+
+	var r0 map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData
+	if rf, ok := ret.Get(0).(func() map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData)
+		}
+	}
+
+	return r0
+}