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process_tracker.go
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process_tracker.go
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package process_tracker
import (
"fmt"
"os/exec"
"sync"
"github.com/cloudfoundry-incubator/garden"
"github.com/cloudfoundry/gunk/command_runner"
"github.com/pivotal-golang/lager"
)
//go:generate counterfeiter -o fake_process_tracker/fake_process_tracker.go . ProcessTracker
type ProcessTracker interface {
Run(processID string, cmd *exec.Cmd, io garden.ProcessIO, tty *garden.TTYSpec, signaller Signaller) (garden.Process, error)
Attach(processID string, io garden.ProcessIO) (garden.Process, error)
Restore(processID string, signaller Signaller)
ActiveProcesses() []garden.Process
}
type processTracker struct {
logger lager.Logger
containerPath string
runner command_runner.CommandRunner
processes map[string]*Process
processesMutex *sync.RWMutex
}
type UnknownProcessError struct {
ProcessID string
}
func (e UnknownProcessError) Error() string {
return fmt.Sprintf("process_tracker: unknown process: %s", e.ProcessID)
}
func New(logger lager.Logger, containerPath string, runner command_runner.CommandRunner) ProcessTracker {
return &processTracker{
logger: logger,
containerPath: containerPath,
runner: runner,
processesMutex: new(sync.RWMutex),
processes: make(map[string]*Process),
}
}
func (t *processTracker) Run(processID string, cmd *exec.Cmd, processIO garden.ProcessIO, tty *garden.TTYSpec, signaller Signaller) (garden.Process, error) {
t.processesMutex.Lock()
process := NewProcess(t.logger.Session("process", lager.Data{"id": processID}), processID, t.containerPath, t.runner, signaller)
t.processes[processID] = process
t.processesMutex.Unlock()
t.logger.Info("run-spawning", lager.Data{"id": processID, "cmd": cmd})
ready, active := process.Spawn(cmd, tty)
t.logger.Info("run-spawned", lager.Data{"id": processID, "cmd": cmd})
t.logger.Info("waiting-iodaemon-ready")
err := <-ready
if err != nil {
t.logger.Error("reading-ready-failed", err)
return nil, err
}
t.logger.Info("iodaemon-ready")
t.logger.Info("attaching")
process.Attach(processIO)
t.logger.Info("attached")
go t.link(process.ID())
t.logger.Info("waiting-iodaemon-active")
err = <-active
if err != nil {
t.logger.Error("reading-active-failed", err)
return nil, err
}
t.logger.Info("iodaemon-active")
return process, nil
}
func (t *processTracker) Attach(processID string, processIO garden.ProcessIO) (garden.Process, error) {
t.processesMutex.RLock()
process, ok := t.processes[processID]
t.processesMutex.RUnlock()
if !ok {
return nil, UnknownProcessError{processID}
}
process.Attach(processIO)
go t.link(processID)
return process, nil
}
func (t *processTracker) Restore(processID string, signaller Signaller) {
t.processesMutex.Lock()
process := NewProcess(t.logger, processID, t.containerPath, t.runner, signaller)
t.processes[processID] = process
go t.link(processID)
t.processesMutex.Unlock()
}
func (t *processTracker) ActiveProcesses() []garden.Process {
t.processesMutex.RLock()
defer t.processesMutex.RUnlock()
processes := make([]garden.Process, 0)
for _, process := range t.processes {
processes = append(processes, process)
}
return processes
}
func (t *processTracker) link(processID string) {
t.logger.Info("link-start")
t.processesMutex.RLock()
process, ok := t.processes[processID]
t.processesMutex.RUnlock()
t.logger.Info("got-process-from-mutex-map")
if !ok {
return
}
defer t.unregister(processID)
process.Link()
return
}
func (t *processTracker) unregister(processID string) {
t.processesMutex.Lock()
defer t.processesMutex.Unlock()
t.logger.Info("unregistering", lager.Data{"id": processID})
delete(t.processes, processID)
}