libhyperstart: add & use WaitProcess()

Signed-off-by: Lai Jiangshan <jiangshanlai@gmail.com>

Author: laijs

hyperstart/libhyperstart/hyperstart.go

@@ -12,11 +12,11 @@ type Hyperstart interface {
 	LastStreamSeq() uint64
 
 	APIVersion() (uint32, error)
-	ProcessAsyncEvents() (<-chan hyperstartapi.ProcessAsyncEvent, error)
 	NewContainer(c *hyperstartapi.Container) (io.WriteCloser, io.ReadCloser, io.ReadCloser, error)
 	RestoreContainer(c *hyperstartapi.Container) (io.WriteCloser, io.ReadCloser, io.ReadCloser, error)
 	AddProcess(container string, p *hyperstartapi.Process) (io.WriteCloser, io.ReadCloser, io.ReadCloser, error)
 	SignalProcess(container, process string, signal syscall.Signal) error
+	WaitProcess(container, process string) int
 	TtyWinResize(container, process string, row, col uint16) error
 
 	StartSandbox(pod *hyperstartapi.Pod) error

hyperstart/libhyperstart/json.go

@@ -30,19 +30,20 @@ type pState struct {
 	stdinPipe  streamIn
 	stdoutPipe io.ReadCloser
 	stderrPipe io.ReadCloser
+	exitStatus *int
+	waitChan   chan int
 }
 
 type jsonBasedHyperstart struct {
 	sync.RWMutex
-	logPrefix          string
-	vmAPIVersion       uint32
-	closed             bool
-	lastStreamSeq      uint64
-	procs              map[pKey]*pState
-	streamOuts         map[uint64]streamOut
-	ctlChan            chan *hyperstartCmd
-	streamChan         chan *hyperstartapi.TtyMessage
-	processAsyncEvents chan hyperstartapi.ProcessAsyncEvent
+	logPrefix     string
+	vmAPIVersion  uint32
+	closed        bool
+	lastStreamSeq uint64
+	procs         map[pKey]*pState
+	streamOuts    map[uint64]streamOut
+	ctlChan       chan *hyperstartCmd
+	streamChan    chan *hyperstartapi.TtyMessage
 }
 
 type hyperstartCmd struct {
@@ -56,13 +57,12 @@ type hyperstartCmd struct {
 
 func NewJsonBasedHyperstart(id, ctlSock, streamSock string, lastStreamSeq uint64, waitReady bool) Hyperstart {
 	h := &jsonBasedHyperstart{
-		logPrefix:          fmt.Sprintf("SB[%s] ", id),
-		procs:              make(map[pKey]*pState),
-		lastStreamSeq:      lastStreamSeq,
-		streamOuts:         make(map[uint64]streamOut),
-		ctlChan:            make(chan *hyperstartCmd, 128),
-		streamChan:         make(chan *hyperstartapi.TtyMessage, 128),
-		processAsyncEvents: make(chan hyperstartapi.ProcessAsyncEvent, 16),
+		logPrefix:     fmt.Sprintf("SB[%s] ", id),
+		procs:         make(map[pKey]*pState),
+		lastStreamSeq: lastStreamSeq,
+		streamOuts:    make(map[uint64]streamOut),
+		ctlChan:       make(chan *hyperstartCmd, 128),
+		streamChan:    make(chan *hyperstartapi.TtyMessage, 128),
 	}
 	go handleStreamSock(h, streamSock)
 	go handleCtlSock(h, ctlSock, waitReady)
@@ -86,8 +86,9 @@ func (h *jsonBasedHyperstart) Close() {
 	defer h.Unlock()
 	if !h.closed {
 		h.Log(TRACE, "close jsonBasedHyperstart")
-		for pk := range h.procs {
-			h.processAsyncEvents <- hyperstartapi.ProcessAsyncEvent{Container: pk.c, Process: pk.p, Event: "finished", Status: 255}
+		for pk, ps := range h.procs {
+			ps.exitStatus = makeExitStatus(255)
+			h.handleWaitProcess(pk, ps)
 		}
 		h.procs = make(map[pKey]*pState)
 		for _, out := range h.streamOuts {
@@ -96,7 +97,6 @@ func (h *jsonBasedHyperstart) Close() {
 		h.streamOuts = make(map[uint64]streamOut)
 		close(h.ctlChan)
 		close(h.streamChan)
-		close(h.processAsyncEvents)
 		for cmd := range h.ctlChan {
 			if cmd.Code != hyperstartapi.INIT_ACK && cmd.Code != hyperstartapi.INIT_ERROR {
 				cmd.result <- fmt.Errorf("hyperstart closed")
@@ -106,10 +106,6 @@ func (h *jsonBasedHyperstart) Close() {
 	}
 }
 
-func (h *jsonBasedHyperstart) ProcessAsyncEvents() (<-chan hyperstartapi.ProcessAsyncEvent, error) {
-	return h.processAsyncEvents, nil
-}
-
 func (h *jsonBasedHyperstart) LastStreamSeq() uint64 {
 	return h.lastStreamSeq
 }
@@ -459,13 +455,22 @@ func handleStreamFromHyperstart(h *jsonBasedHyperstart, conn io.Reader) {
 	}
 }
 
+func makeExitStatus(status int) *int { return &status }
+
+func (h *jsonBasedHyperstart) handleWaitProcess(pk pKey, ps *pState) {
+	if ps.exitStatus != nil && ps.waitChan != nil {
+		delete(h.procs, pk)
+		ps.waitChan <- *ps.exitStatus
+	}
+}
+
 func (h *jsonBasedHyperstart) sendProcessAsyncEvent(pae hyperstartapi.ProcessAsyncEvent) {
 	h.Lock()
 	defer h.Unlock()
 	pk := pKey{c: pae.Container, p: pae.Process}
-	if _, ok := h.procs[pk]; ok {
-		delete(h.procs, pk)
-		h.processAsyncEvents <- pae
+	if ps, ok := h.procs[pk]; ok {
+		ps.exitStatus = makeExitStatus(pae.Status)
+		h.handleWaitProcess(pk, ps)
 	}
 }
 
@@ -474,8 +479,8 @@ func (h *jsonBasedHyperstart) sendProcessAsyncEvent4242(stdioSeq uint64, code ui
 	defer h.Unlock()
 	for pk, ps := range h.procs {
 		if ps.stdioSeq == stdioSeq {
-			delete(h.procs, pk)
-			h.processAsyncEvents <- hyperstartapi.ProcessAsyncEvent{Container: pk.c, Process: pk.p, Event: "finished", Status: int(code)}
+			ps.exitStatus = makeExitStatus(int(code))
+			h.handleWaitProcess(pk, ps)
 		}
 	}
 }
@@ -752,6 +757,26 @@ func (h *jsonBasedHyperstart) SignalProcess(container, process string, signal sy
 	})
 }
 
+// wait the process until exit. like waitpid()
+// the state is saved until someone calls WaitProcess() if the process exited earlier
+// the non-first call of WaitProcess() after process started MAY fail to find the process if the process exited earlier
+func (h *jsonBasedHyperstart) WaitProcess(container, process string) int {
+	h.Lock()
+	pk := pKey{c: container, p: process}
+	if ps, ok := h.procs[pk]; ok {
+		if ps.waitChan == nil {
+			ps.waitChan = make(chan int, 1)
+			h.handleWaitProcess(pk, ps)
+		}
+		h.Unlock()
+		status := <-ps.waitChan
+		ps.waitChan <- status
+		return status
+	}
+	h.Unlock()
+	return -1
+}
+
 func (h *jsonBasedHyperstart) StartSandbox(pod *hyperstartapi.Pod) error {
 	return h.hyperstartCommand(hyperstartapi.INIT_STARTPOD, pod)
 }

hypervisor/context.go

@@ -236,31 +236,6 @@ func (ctx *VmContext) LookupBySession(session uint64) string {
 	return ""
 }
 
-func (ctx *VmContext) handleProcessAsyncEvent(pae *hyperstartapi.ProcessAsyncEvent) {
-	if pae.Event != "finished" {
-		return
-	}
-	if pae.Process == "init" {
-		ctx.reportProcessFinished(types.E_CONTAINER_FINISHED, &types.ProcessFinished{
-			Id: pae.Container, Code: uint8(pae.Status), Ack: make(chan bool, 1),
-		})
-		ctx.lock.Lock()
-		if c, ok := ctx.containers[pae.Container]; ok {
-			c.Log(TRACE, "container finished, unset iostream pipes")
-			c.stdinPipe = nil
-			c.stdoutPipe = nil
-			c.stderrPipe = nil
-			c.tty = nil
-		}
-		ctx.lock.Unlock()
-	} else {
-		ctx.DeleteExec(pae.Process)
-		ctx.reportProcessFinished(types.E_EXEC_FINISHED, &types.ProcessFinished{
-			Id: pae.Process, Code: uint8(pae.Status), Ack: make(chan bool, 1),
-		})
-	}
-}
-
 func (ctx *VmContext) Close() {
 	ctx.closeOnce.Do(func() {
 		ctx.Log(INFO, "VmContext Close()")

hypervisor/hypervisor.go

@@ -31,18 +31,6 @@ func (ctx *VmContext) loop() {
 	ctx.Log(DEBUG, "main event loop exiting")
 }
 
-func (ctx *VmContext) handlePAEs() {
-	ch, err := ctx.hyperstart.ProcessAsyncEvents()
-	if err == nil {
-		for e := range ch {
-			ctx.handleProcessAsyncEvent(&e)
-		}
-	}
-	ctx.hyperstart.Close()
-	ctx.Log(ERROR, "hyperstart stopped")
-	ctx.Hub <- &Interrupted{Reason: "hyperstart stopped"}
-}
-
 func (ctx *VmContext) watchHyperstart(sendReadyEvent bool) {
 	timeout := time.AfterFunc(30*time.Second, func() {
 		if ctx.PauseState == PauseStateUnpaused {
@@ -92,7 +80,6 @@ func (ctx *VmContext) Launch() {
 	}
 
 	go ctx.loop()
-	go ctx.handlePAEs()
 }
 
 func VmAssociate(vmId string, hub chan VmEvent, client chan *types.VmResponse, pack []byte) (*VmContext, error) {
@@ -130,7 +117,6 @@ func VmAssociate(vmId string, hub chan VmEvent, client chan *types.VmResponse, p
 	//}
 
 	go context.watchHyperstart(false)
-	go context.handlePAEs()
 	go context.loop()
 	return context, nil
 }

hypervisor/vm.go

@@ -493,6 +493,13 @@ func (vm *Vm) AddProcess(container, execId string, terminal bool, args []string,
 	}
 
 	go streamCopy(tty, stdinPipe, stdoutPipe, stderrPipe)
+	go func() {
+		status := vm.ctx.hyperstart.WaitProcess(container, execId)
+		vm.ctx.DeleteExec(execId)
+		vm.ctx.reportProcessFinished(types.E_EXEC_FINISHED, &types.ProcessFinished{
+			Id: execId, Code: uint8(status), Ack: make(chan bool, 1),
+		})
+	}()
 	return nil
 }
 

hypervisor/vm_states.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/hyperhq/hypercontainer-utils/hlog"
+	"github.com/hyperhq/runv/hypervisor/types"
 )
 
 // states
@@ -44,6 +45,21 @@ func (ctx *VmContext) newContainer(id string) error {
 			go streamCopy(c.tty, c.stdinPipe, c.stdoutPipe, c.stderrPipe)
 		}
 		ctx.Log(TRACE, "sent INIT_NEWCONTAINER")
+		go func() {
+			status := ctx.hyperstart.WaitProcess(id, "init")
+			ctx.reportProcessFinished(types.E_CONTAINER_FINISHED, &types.ProcessFinished{
+				Id: id, Code: uint8(status), Ack: make(chan bool, 1),
+			})
+			ctx.lock.Lock()
+			if c, ok := ctx.containers[id]; ok {
+				c.Log(TRACE, "container finished, unset iostream pipes")
+				c.stdinPipe = nil
+				c.stdoutPipe = nil
+				c.stderrPipe = nil
+				c.tty = nil
+			}
+			ctx.lock.Unlock()
+		}()
 		return err
 	} else {
 		return fmt.Errorf("container %s not exist", id)
@@ -72,6 +88,21 @@ func (ctx *VmContext) restoreContainer(id string) (alive bool, err error) {
 		}
 		return false, nil
 	}
+	go func() {
+		status := ctx.hyperstart.WaitProcess(id, "init")
+		ctx.reportProcessFinished(types.E_CONTAINER_FINISHED, &types.ProcessFinished{
+			Id: id, Code: uint8(status), Ack: make(chan bool, 1),
+		})
+		ctx.lock.Lock()
+		if c, ok := ctx.containers[id]; ok {
+			c.Log(TRACE, "container finished, unset iostream pipes")
+			c.stdinPipe = nil
+			c.stdoutPipe = nil
+			c.stderrPipe = nil
+			c.tty = nil
+		}
+		ctx.lock.Unlock()
+	}()
 	return true, nil
 }