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exec.go
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exec.go
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//
// (C) Copyright 2019 Intel Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE
// The Government's rights to use, modify, reproduce, release, perform, display,
// or disclose this software are subject to the terms of the Apache License as
// provided in Contract No. 8F-30005.
// Any reproduction of computer software, computer software documentation, or
// portions thereof marked with this legend must also reproduce the markings.
//
package ioserver
import (
"context"
"fmt"
"os"
"os/exec"
"sync/atomic"
"syscall"
"github.com/pkg/errors"
"github.com/daos-stack/daos/src/control/common"
"github.com/daos-stack/daos/src/control/logging"
)
const (
ioServerBin = "daos_io_server"
// NormalExit indicates that the process exited without error
NormalExit ExitStatus = "process exited with 0"
)
type (
// ExitStatus implements the error interface and is
// used to indicate special IOserver exit conditions.
ExitStatus string
// Runner starts and manages an instance of a DAOS I/O Server
Runner struct {
Config *Config
log logging.Logger
running uint32
cmd *exec.Cmd
}
)
func (es ExitStatus) Error() string {
return string(es)
}
// Ensure that a monitored subcommand always returns
// an error of some sort when it exits so that we
// can respond appropriately.
func exitStatus(err error) error {
if err != nil {
return err
}
return NormalExit
}
// NewRunner returns a configured ioserver.Runner
func NewRunner(log logging.Logger, config *Config) *Runner {
return &Runner{
Config: config,
log: log,
}
}
func (r *Runner) run(ctx context.Context, args, env []string) error {
binPath, err := common.FindBinary(ioServerBin)
if err != nil {
return errors.Wrapf(err, "can't start %s", ioServerBin)
}
cmd := exec.CommandContext(ctx, binPath, args...)
cmd.Stdout = &cmdLogger{
logFn: r.log.Info,
prefix: fmt.Sprintf("%s:%d", ioServerBin, r.Config.Index),
}
cmd.Stderr = &cmdLogger{
logFn: r.log.Error,
prefix: fmt.Sprintf("%s:%d", ioServerBin, r.Config.Index),
}
// FIXME(DAOS-3105): This shouldn't be the default. The command environment
// should be constructed from values in the configuration. This probably
// can't go away until PMIx support is removed, though.
cmd.Env = mergeEnvVars(os.Environ(), env)
cmd.SysProcAttr = &syscall.SysProcAttr{
// I/O server should get a SIGKILL if this process dies.
Pdeathsig: syscall.SIGKILL,
// I/O server should run with real uid/gid (drop egid).
Credential: &syscall.Credential{
Uid: uint32(os.Getuid()),
Gid: uint32(os.Getgid()),
NoSetGroups: true,
},
}
r.log.Debugf("%s:%d args: %s", ioServerBin, r.Config.Index, args)
r.log.Debugf("%s:%d env: %s", ioServerBin, r.Config.Index, env)
r.log.Infof("Starting I/O server instance %d: %s", r.Config.Index, binPath)
if err := cmd.Start(); err != nil {
return errors.Wrapf(exitStatus(err),
"%s (instance %d) failed to start", binPath, r.Config.Index)
}
r.cmd = cmd
r.setRunning()
defer r.setStopped()
return errors.Wrapf(exitStatus(cmd.Wait()), "%s (instance %d) exited", binPath, r.Config.Index)
}
// Start asynchronously starts the IOServer instance.
func (r *Runner) Start(ctx context.Context, errOut chan<- error) error {
args, err := r.Config.CmdLineArgs()
if err != nil {
return err
}
env, err := r.Config.CmdLineEnv()
if err != nil {
return err
}
go func() {
errOut <- r.run(ctx, args, env)
}()
return nil
}
func (r *Runner) setRunning() {
atomic.StoreUint32(&r.running, 1)
}
func (r *Runner) setStopped() {
atomic.StoreUint32(&r.running, 0)
}
// IsRunning indicates whether the Runner process is running or not.
func (r *Runner) IsRunning() bool {
return atomic.LoadUint32(&r.running) != 0
}
// Stop sends relevant shutdown signal to the Runner process (idempotent).
func (r *Runner) Stop(force bool) error {
if !r.IsRunning() {
return nil
}
signal := syscall.SIGTERM
if force {
signal = syscall.SIGKILL
}
r.log.Debugf("Stopping I/O server instance %d (%s)", r.Config.Index, signal)
return r.cmd.Process.Signal(signal)
}
// GetConfig returns the runner's configuration
func (r *Runner) GetConfig() *Config {
return r.Config
}