Add basic nomad integration and runner provider

api/runners.go

@@ -0,0 +1,35 @@
+package api
+
+import (
+	"encoding/json"
+	"github.com/gorilla/mux"
+	"gitlab.hpi.de/codeocean/codemoon/poseidon/api/dto"
+	"gitlab.hpi.de/codeocean/codemoon/poseidon/environment"
+	"net/http"
+)
+
+// ProvideRunner tries to respond with the id of a runner.
+// This runner is then reserved for future use.
+func ProvideRunner(writer http.ResponseWriter, request *http.Request) {
+	runnerRequest := new(dto.RequestRunner)
+	if err := json.NewDecoder(request.Body).Decode(runnerRequest); err != nil {
+		writeBadRequest(writer, err)
+		return
+	}
+	environment, err := environment.GetExecutionEnvironment(runnerRequest.ExecutionEnvironmentId)
+	if err != nil {
+		writeNotFound(writer, err)
+		return
+	}
+	runner, err := environment.NextRunner()
+	if err != nil {
+		writeInternalServerError(writer, err, dto.ErrorNomadOverload)
+		return
+	}
+
+	sendJson(writer, &dto.ResponseRunner{Id: runner.Id()}, http.StatusOK)
+}
+
+func registerRunnerRoutes(router *mux.Router) {
+	router.HandleFunc("", ProvideRunner).Methods(http.MethodPost)
+}