Add basic nomad integration and runner provider

runner/runner.go

@@ -0,0 +1,71 @@
+package runner
+
+import (
+	"encoding/json"
+	"sync"
+)
+
+type Status string
+
+const (
+	StatusReady    Status = "ready"
+	StatusRunning  Status = "running"
+	StatusTimeout  Status = "timeout"
+	StatusFinished Status = "finished"
+)
+
+type Runner interface {
+	SetStatus(Status)
+	Status() Status
+	Id() string
+}
+
+// ExerciseRunner is an abstraction to communicate with Nomad allocations
+type ExerciseRunner struct {
+	sync.Mutex
+	id     string
+	status Status
+	ch     chan bool
+}
+
+// NewExerciseRunner creates a new exercise runner with the provided id
+// As default value the status is ready
+func NewExerciseRunner(id string) *ExerciseRunner {
+	return &ExerciseRunner{
+		id:     id,
+		status: StatusReady,
+		Mutex:  sync.Mutex{},
+		ch:     make(chan bool),
+	}
+}
+
+// MarshalJSON implements json.Marshaler interface
+// This exports also private attributes like the id
+func (r *ExerciseRunner) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Id     string `json:"runnerId"`
+		Status Status `json:"status"`
+	}{
+		Id:     r.Id(),
+		Status: r.Status(),
+	})
+}
+
+// SetStatus sets the status thread-safe
+func (r *ExerciseRunner) SetStatus(status Status) {
+	r.Lock()
+	defer r.Unlock()
+	r.status = status
+}
+
+// Status returns the status thread-safe
+func (r *ExerciseRunner) Status() Status {
+	r.Lock()
+	defer r.Unlock()
+	return r.status
+}
+
+// Id returns the id of the runner
+func (r *ExerciseRunner) Id() string {
+	return r.id
+}