3afcdeaba8
This enables executing commands in runners and forwarding input and output between the runner and the websocket to the client. Co-authored-by: Maximilian Paß <maximilian.pass@student.hpi.uni-potsdam.de>
109 lines
2.9 KiB
Go
109 lines
2.9 KiB
Go
package runner
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import (
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"context"
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"encoding/json"
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"gitlab.hpi.de/codeocean/codemoon/poseidon/api/dto"
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"gitlab.hpi.de/codeocean/codemoon/poseidon/nomad"
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"io"
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"time"
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)
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// ContextKey is the type for keys in a request context.
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type ContextKey string
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// ExecutionId is an id for an execution in a Runner.
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type ExecutionId string
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const (
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// runnerContextKey is the key used to store runners in context.Context
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runnerContextKey ContextKey = "runner"
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)
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type Runner interface {
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// Id returns the id of the runner.
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Id() string
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ExecutionStorage
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// Execute runs the given execution request and forwards from and to the given reader and writers.
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// An ExitInfo is sent to the exit channel on command completion.
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Execute(request *dto.ExecutionRequest, stdin io.Reader, stdout, stderr io.Writer) (exit <-chan ExitInfo, cancel context.CancelFunc)
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// Copy copies the specified files into the runner.
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Copy(dto.FileCreation)
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}
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// NomadAllocation is an abstraction to communicate with Nomad allocations.
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type NomadAllocation struct {
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ExecutionStorage
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id string
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api nomad.ExecutorApi
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}
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// NewRunner creates a new runner with the provided id.
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func NewRunner(id string) Runner {
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return NewNomadAllocation(id, nil)
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}
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// NewNomadAllocation creates a new Nomad allocation with the provided id.
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func NewNomadAllocation(id string, apiClient nomad.ExecutorApi) *NomadAllocation {
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return &NomadAllocation{
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id: id,
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api: apiClient,
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ExecutionStorage: NewLocalExecutionStorage(),
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}
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}
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func (r *NomadAllocation) Id() string {
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return r.id
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}
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type ExitInfo struct {
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Code uint8
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Err error
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}
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func (r *NomadAllocation) Execute(request *dto.ExecutionRequest, stdin io.Reader, stdout, stderr io.Writer) (<-chan ExitInfo, context.CancelFunc) {
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command := request.FullCommand()
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var ctx context.Context
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var cancel context.CancelFunc
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if request.TimeLimit == 0 {
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ctx, cancel = context.WithCancel(context.Background())
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} else {
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ctx, cancel = context.WithTimeout(context.Background(), time.Duration(request.TimeLimit)*time.Second)
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}
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exit := make(chan ExitInfo)
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go func() {
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exitCode, err := r.api.ExecuteCommand(r.Id(), ctx, command, stdin, stdout, stderr)
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exit <- ExitInfo{uint8(exitCode), err}
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close(exit)
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}()
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return exit, cancel
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}
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func (r *NomadAllocation) Copy(files dto.FileCreation) {
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}
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// MarshalJSON implements json.Marshaler interface.
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// This exports private attributes like the id too.
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func (r *NomadAllocation) MarshalJSON() ([]byte, error) {
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return json.Marshal(struct {
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Id string `json:"runnerId"`
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}{
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Id: r.Id(),
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})
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}
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// NewContext creates a context containing a runner.
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func NewContext(ctx context.Context, runner Runner) context.Context {
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return context.WithValue(ctx, runnerContextKey, runner)
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}
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// FromContext returns a runner from a context.
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func FromContext(ctx context.Context) (Runner, bool) {
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runner, ok := ctx.Value(runnerContextKey).(Runner)
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return runner, ok
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}
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