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/
service_exec.go
343 lines (296 loc) · 8.79 KB
/
service_exec.go
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package singleprocess
import (
"context"
"io"
"time"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/go-memdb"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"github.com/hashicorp/waypoint/internal/server"
pb "github.com/hashicorp/waypoint/internal/server/gen"
"github.com/hashicorp/waypoint/internal/server/grpcmetadata"
"github.com/hashicorp/waypoint/internal/server/ptypes"
"github.com/hashicorp/waypoint/internal/server/singleprocess/state"
)
func (s *service) StartExecStream(
srv pb.Waypoint_StartExecStreamServer,
) error {
log := hclog.FromContext(srv.Context())
// Read our first event which must be a Start event.
log.Trace("waiting for Start message")
req, err := srv.Recv()
if err != nil {
return err
}
start, ok := req.Event.(*pb.ExecStreamRequest_Start_)
if !ok {
return status.Errorf(codes.FailedPrecondition,
"first message must be start type")
}
if err := ptypes.ValidateExecStreamRequestStart(start.Start); err != nil {
return err
}
// Create our exec. We have to populate everything here first because
// once we register, this will trigger any watchers to be notified of
// a change and the instance should try to connect to us.
clientEventCh := make(chan *pb.ExecStreamRequest)
eventCh := make(chan *pb.EntrypointExecRequest)
execRec := &state.InstanceExec{
Args: start.Start.Args,
Pty: start.Start.Pty,
ClientEventCh: clientEventCh,
EntrypointEventCh: eventCh,
Context: srv.Context(),
}
// Register the exec session
switch t := start.Start.Target.(type) {
case *pb.ExecStreamRequest_Start_InstanceId:
log = log.With("instance_id", t.InstanceId)
err = s.state.InstanceExecCreateByTargetedInstance(t.InstanceId, execRec)
if err != nil {
return err
}
case *pb.ExecStreamRequest_Start_DeploymentId:
log = log.With("deployment_id", t.DeploymentId)
deployment, err := s.state.DeploymentGet(&pb.Ref_Operation{
Target: &pb.Ref_Operation_Id{
Id: t.DeploymentId,
},
})
if err != nil {
return err
}
// We need to spawn a job that will in turn spawn a virtual CEB
// that will connect back and create an instance exec record for us
// to use.
if deployment.HasExecPlugin {
instId, err := server.Id()
if err != nil {
return err
}
log.Info("spawning exec plugin via job", "instance-id", instId)
job := &pb.Job{
Workspace: deployment.Workspace,
Application: deployment.Application,
Operation: &pb.Job_Exec{
Exec: &pb.Job_ExecOp{
InstanceId: instId,
Deployment: deployment,
},
},
}
// Means the client WANTS the job run on itself, so let's target the
// job back to it.
if runnerId, ok := grpcmetadata.RunnerId(srv.Context()); ok {
job.DataSource = &pb.Job_DataSource{
Source: &pb.Job_DataSource_Local{
Local: &pb.Job_Local{},
},
}
job.TargetRunner = &pb.Ref_Runner{
Target: &pb.Ref_Runner_Id{
Id: &pb.Ref_RunnerId{
Id: runnerId,
},
},
}
// Otherwise, the client wants an exec session but doesn't have a runner
// to use, so we just target any runner.
} else {
job.TargetRunner = &pb.Ref_Runner{
Target: &pb.Ref_Runner_Any{
Any: &pb.Ref_RunnerAny{},
},
}
// We leave DataSource unset here so that QueueJob will port over the data
// source from the project.
}
qresp, err := s.QueueJob(srv.Context(), &pb.QueueJobRequest{
Job: job,
// TODO unknown if this is enough time for when the request is queued
// by a runner-less client but a user waiting 60 seconds will get impatient
// regardless.
ExpiresIn: "60s",
})
if err != nil {
return err
}
jobId := qresp.JobId
// Be sure that if we decide things aren't going well, the job doesn't outlive
// its usefulness.
defer s.state.JobCancel(jobId, false)
log.Debug("waiting on job state", "job-id", jobId)
state, err := s.waitOnJobStarted(srv.Context(), jobId)
if err != nil {
return err
}
switch state {
case pb.Job_ERROR:
return status.Errorf(codes.FailedPrecondition, "job errored out before starting")
case pb.Job_SUCCESS:
return status.Errorf(codes.Internal, "job succeeded before running")
case pb.Job_RUNNING:
// ok
default:
return status.Errorf(codes.Internal, "unexpected job status: %s", state.String())
}
// If the virtual instance doesn't show up in 60 seconds, just time out and return
// an error.
ctx, cancel := context.WithTimeout(srv.Context(), 60*time.Second)
defer cancel()
err = s.state.InstanceExecCreateForVirtualInstance(ctx, instId, execRec)
if err != nil {
return err
}
} else {
err = s.state.InstanceExecCreateByDeployment(t.DeploymentId, execRec)
if err != nil {
return err
}
}
default:
log.Error("exec request sent neither instance id nor deployment id")
return status.Errorf(codes.FailedPrecondition,
"request sent neither instance id nor deployment id")
}
log.Debug("exec requested", "args", start.Start.Args)
// Make sure we always deregister it
defer s.state.InstanceExecDelete(execRec.Id)
// Always send the open message. In the future we'll send some metadata here.
if err := srv.Send(&pb.ExecStreamResponse{
Event: &pb.ExecStreamResponse_Open_{
Open: &pb.ExecStreamResponse_Open{},
},
}); err != nil {
return err
}
// Start our receive loop to read data from the client
clientCloseCh := make(chan error, 1)
go func() {
defer close(clientEventCh)
defer close(clientCloseCh)
for {
resp, err := srv.Recv()
if err == io.EOF {
// This means our client closed the stream. if the client
// closed the stream, we want to end the exec stream completely.
return
}
if err != nil {
// Non EOF errors we will just send the error down and exit.
clientCloseCh <- err
return
}
clientEventCh <- resp
}
}()
// Loop through and read events
for {
select {
case <-srv.Context().Done():
// The context was closed so we just exit. This will trigger
// the EOF in the recv goroutine which will end the entrypoint
// side as well.
return nil
case err := <-clientCloseCh:
// The client closed the connection so we want to exit the stream.
return err
case entryReq, active := <-eventCh:
// We got an event, exit out of the select and determine our action
if !active {
log.Debug("event channel closed, exiting")
return nil
}
exit, err := s.handleEntrypointExecRequest(log, srv, entryReq)
if exit || err != nil {
return err
}
}
}
}
func (s *service) handleEntrypointExecRequest(
log hclog.Logger,
srv pb.Waypoint_StartExecStreamServer,
entryReq *pb.EntrypointExecRequest,
) (bool, error) {
log.Trace("event received from entrypoint", "event", entryReq.Event)
var send *pb.ExecStreamResponse
exit := false
switch event := entryReq.Event.(type) {
case *pb.EntrypointExecRequest_Output_:
send = &pb.ExecStreamResponse{
Event: &pb.ExecStreamResponse_Output_{
Output: &pb.ExecStreamResponse_Output{
Channel: pb.ExecStreamResponse_Output_Channel(event.Output.Channel),
Data: event.Output.Data,
},
},
}
case *pb.EntrypointExecRequest_Exit_:
exit = true
send = &pb.ExecStreamResponse{
Event: &pb.ExecStreamResponse_Exit_{
Exit: &pb.ExecStreamResponse_Exit{
Code: event.Exit.Code,
},
},
}
case *pb.EntrypointExecRequest_Error_:
log.Warn("error observed processing entrypoint exec stream", "error", event.Error.Error)
exit = true
send = &pb.ExecStreamResponse{
Event: &pb.ExecStreamResponse_Exit_{
Exit: &pb.ExecStreamResponse_Exit{
Code: 1,
},
},
}
default:
log.Warn("unimplemented exec entrypoint message seen", "event", hclog.Fmt("%T", event))
}
// Send our response
if send != nil {
if err := srv.Send(send); err != nil {
log.Warn("stream error", "err", err)
return false, err
}
}
return exit, nil
}
// Wait for the given job to reach a state where it has been been acted upon in some manner.
func (s *service) waitOnJobStarted(ctx context.Context, jobId string) (pb.Job_State, error) {
log := hclog.FromContext(ctx)
// Get the job
ws := memdb.NewWatchSet()
job, err := s.state.JobById(jobId, ws)
if err != nil {
return 0, err
}
if job == nil {
return 0, status.Errorf(codes.NotFound, "job not found for ID: %s", jobId)
}
log = log.With("job_id", job.Id)
for {
switch job.State {
case pb.Job_ERROR, pb.Job_RUNNING, pb.Job_SUCCESS:
return job.State, nil
}
// Wait for the job to update
if err := ws.WatchCtx(ctx); err != nil {
if ctx.Err() != nil {
return 0, ctx.Err()
}
return 0, err
}
// Updated job, requery it
ws = memdb.NewWatchSet()
job, err = s.state.JobById(job.Id, ws)
if err != nil {
return 0, err
}
if job == nil {
return 0, status.Errorf(codes.Internal, "job disappeared for ID: %s", jobId)
}
}
}