127 lines
4.3 KiB
Go
127 lines
4.3 KiB
Go
package api
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import (
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"errors"
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"fmt"
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"github.com/gorilla/mux"
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"gitlab.hpi.de/codeocean/codemoon/poseidon/api/dto"
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"gitlab.hpi.de/codeocean/codemoon/poseidon/config"
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"gitlab.hpi.de/codeocean/codemoon/poseidon/environment"
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"gitlab.hpi.de/codeocean/codemoon/poseidon/nomad"
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"gitlab.hpi.de/codeocean/codemoon/poseidon/runner"
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"net/http"
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"net/url"
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)
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const (
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ExecutePath = "/execute"
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WebsocketPath = "/websocket"
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DeleteRoute = "deleteRunner"
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RunnerIdKey = "runnerId"
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ExecutionIdKey = "executionId"
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)
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// provideRunner tries to respond with the id of a runner
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// This runner is then reserved for future use
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func provideRunner(writer http.ResponseWriter, request *http.Request) {
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runnerRequest := new(dto.RunnerRequest)
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if err := parseJSONRequestBody(writer, request, runnerRequest); err != nil {
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return
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}
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executionEnvironment, err := environment.GetExecutionEnvironment(runnerRequest.ExecutionEnvironmentId)
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if err != nil {
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writeNotFound(writer, err)
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return
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}
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nextRunner, err := executionEnvironment.NextRunner()
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if err != nil {
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writeInternalServerError(writer, err, dto.ErrorNomadOverload)
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return
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}
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sendJson(writer, &dto.RunnerResponse{Id: nextRunner.Id()}, http.StatusOK)
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}
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// executeCommand takes an ExecutionRequest and stores it for a runner.
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// It returns a url to connect to for a websocket connection to this execution in the corresponding runner.
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func executeCommand(router *mux.Router) func(w http.ResponseWriter, r *http.Request) {
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return func(writer http.ResponseWriter, request *http.Request) {
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executionRequest := new(dto.ExecutionRequest)
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if err := parseJSONRequestBody(writer, request, executionRequest); err != nil {
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return
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}
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var scheme string
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if config.Config.Server.TLS {
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scheme = "wss"
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} else {
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scheme = "ws"
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}
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r, _ := runner.FromContext(request.Context())
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path, err := router.Get(WebsocketPath).URL(RunnerIdKey, r.Id())
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if err != nil {
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log.WithError(err).Error("Could not create runner websocket URL.")
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writeInternalServerError(writer, err, dto.ErrorUnknown)
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return
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}
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id, err := r.AddExecution(*executionRequest)
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if err != nil {
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log.WithError(err).Error("Could not store execution.")
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writeInternalServerError(writer, err, dto.ErrorUnknown)
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return
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}
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websocketUrl := url.URL{
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Scheme: scheme,
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Host: request.Host,
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Path: path.String(),
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RawQuery: fmt.Sprintf("%s=%s", ExecutionIdKey, id),
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}
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sendJson(writer, &dto.WebsocketResponse{WebsocketUrl: websocketUrl.String()}, http.StatusOK)
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}
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}
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// The findRunnerMiddleware looks up the runnerId for routes containing it
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// and adds the runner to the context of the request.
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func findRunnerMiddleware(runnerPool environment.RunnerPool) func(handler http.Handler) http.Handler {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
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// Find runner
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runnerId := mux.Vars(request)[RunnerIdKey]
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r, ok := runnerPool.Get(runnerId)
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if !ok {
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writeNotFound(writer, errors.New("no runner with this id"))
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return
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}
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ctx := runner.NewContext(request.Context(), r.(runner.Runner))
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requestWithRunner := request.WithContext(ctx)
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next.ServeHTTP(writer, requestWithRunner)
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})
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}
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}
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func deleteRunner(apiClient nomad.ExecutorApi, runnerPool environment.RunnerPool) func(writer http.ResponseWriter, request *http.Request) {
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return func(writer http.ResponseWriter, request *http.Request) {
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targetRunner, _ := runner.FromContext(request.Context())
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err := apiClient.DeleteRunner(targetRunner.Id())
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if err != nil {
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writeInternalServerError(writer, err, dto.ErrorNomadInternalServerError)
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return
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}
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runnerPool.Delete(targetRunner.Id())
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writer.WriteHeader(http.StatusNoContent)
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}
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}
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func registerRunnerRoutes(router *mux.Router, apiClient nomad.ExecutorApi, runnerPool environment.RunnerPool) {
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router.HandleFunc("", provideRunner).Methods(http.MethodPost)
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runnerRouter := router.PathPrefix(fmt.Sprintf("/{%s}", RunnerIdKey)).Subrouter()
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runnerRouter.Use(findRunnerMiddleware(runnerPool))
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runnerRouter.HandleFunc(ExecutePath, executeCommand(runnerRouter)).Methods(http.MethodPost).Name(ExecutePath)
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runnerRouter.HandleFunc(WebsocketPath, connectToRunner).Methods(http.MethodGet).Name(WebsocketPath)
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runnerRouter.HandleFunc("", deleteRunner(apiClient, runnerPool)).Methods(http.MethodDelete).Name(DeleteRoute)
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}
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