Use opportunity to structure project by subcommands.
This commit is contained in:
Christian Schwarz 2017-07-06 13:03:44 +02:00
parent 655b3ab55f
commit b44a005bbb
9 changed files with 409 additions and 338 deletions

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@ -1,11 +1,64 @@
package main
package cmd
import (
"fmt"
"github.com/spf13/cobra"
"github.com/zrepl/zrepl/jobrun"
"github.com/zrepl/zrepl/zfs"
"sync"
"time"
)
var autosnapArgs struct {
job string
}
var AutosnapCmd = &cobra.Command{
Use: "autosnap",
Short: "perform automatic snapshotting",
Run: cmdAutosnap,
}
func init() {
AutosnapCmd.Flags().StringVar(&autosnapArgs.job, "job", "", "job to run")
RootCmd.AddCommand(AutosnapCmd)
}
func cmdAutosnap(cmd *cobra.Command, args []string) {
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
runner.Start()
}()
log.Printf("autosnap...")
for i := range conf.Autosnaps {
snap := conf.Autosnaps[i]
if autosnapArgs.job == "" || autosnapArgs.job == snap.Name {
job := jobrun.Job{
Name: fmt.Sprintf("autosnap.%s", snap.Name),
RepeatStrategy: snap.Interval,
RunFunc: func(log jobrun.Logger) error {
log.Printf("doing autosnap: %v", snap)
ctx := AutosnapContext{snap}
return doAutosnap(ctx, log)
},
}
runner.AddJob(job)
}
}
wg.Wait()
}
type AutosnapContext struct {
Autosnap Autosnap
}

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@ -1,4 +1,4 @@
package main
package cmd
import (
"errors"

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@ -1,4 +1,4 @@
package main
package cmd
import (
"github.com/stretchr/testify/assert"

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@ -1,4 +1,4 @@
package main
package cmd
import (
"fmt"

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@ -1,365 +1,104 @@
package main
// zrepl replicates ZFS filesystems & volumes between pools
//
// Code Organization
//
// The cmd package uses github.com/spf13/cobra for its CLI.
//
// It combines the other packages in the zrepl project to implement zrepl functionality.
//
// Each subcommand's code is in the corresponding *.go file.
// All other *.go files contain code shared by the subcommands.
package cmd
import (
"fmt"
"github.com/urfave/cli"
"github.com/spf13/cobra"
"github.com/zrepl/zrepl/jobrun"
"github.com/zrepl/zrepl/rpc"
"github.com/zrepl/zrepl/sshbytestream"
"github.com/zrepl/zrepl/zfs"
"golang.org/x/sys/unix"
"io"
"log"
golog "log"
"net/http"
_ "net/http/pprof"
"os"
"runtime/debug"
"sync"
"time"
)
type Logger interface {
Printf(format string, v ...interface{})
}
var conf Config
var runner *jobrun.JobRunner
var logFlags int = log.LUTC | log.Ldate | log.Ltime
var logOut io.Writer
var defaultLog Logger
// global state / facilities
var (
conf Config
runner *jobrun.JobRunner
logFlags int = golog.LUTC | golog.Ldate | golog.Ltime
logOut io.Writer
log Logger
)
func main() {
var RootCmd = &cobra.Command{
Use: "zrepl",
Short: "ZFS dataset replication",
Long: `Replicate ZFS filesystems & volumes between pools:
defer func() {
e := recover()
if e != nil {
defaultLog.Printf("panic:\n%s\n\n", debug.Stack())
defaultLog.Printf("error: %t %s", e, e)
os.Exit(1)
- push & pull mode
- automatic snapshot creation & pruning
- local / over the network
- ACLs instead of blank SSH access`,
}
}()
app := cli.NewApp()
app.Name = "zrepl"
app.Usage = "replicate zfs datasets"
app.EnableBashCompletion = true
app.Flags = []cli.Flag{
cli.StringFlag{Name: "config"},
cli.StringFlag{Name: "logfile"},
cli.StringFlag{Name: "debug.pprof.http"},
var rootArgs struct {
configFile string
stderrFile string
httpPprof string
}
app.Before = func(c *cli.Context) (err error) {
// Logging
if c.GlobalIsSet("logfile") {
var logFile *os.File
logFile, err = os.OpenFile(c.String("logfile"), os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0600)
func init() {
cobra.OnInitialize(initConfig)
RootCmd.PersistentFlags().StringVar(&rootArgs.configFile, "config", "", "config file path")
RootCmd.PersistentFlags().StringVar(&rootArgs.stderrFile, "stderrFile", "-", "redirect stderr to given path")
RootCmd.PersistentFlags().StringVar(&rootArgs.httpPprof, "debug.pprof.http", "", "run pprof http server on given port")
}
func initConfig() {
// Logging & stderr redirection
if rootArgs.stderrFile != "-" {
file, err := os.OpenFile(rootArgs.stderrFile, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0600)
if err != nil {
return
}
if err = unix.Dup2(int(logFile.Fd()), int(os.Stderr.Fd())); err != nil {
logFile.WriteString(fmt.Sprintf("error duping logfile to stderr: %s\n", err))
if err = unix.Dup2(int(file.Fd()), int(os.Stderr.Fd())); err != nil {
file.WriteString(fmt.Sprintf("error redirecting stderr file %s: %s\n", rootArgs.stderrFile, err))
return
}
logOut = logFile
logOut = file
} else {
logOut = os.Stderr
}
defaultLog = log.New(logOut, "", logFlags)
log = golog.New(logOut, "", logFlags)
// CPU profiling
if c.GlobalIsSet("debug.pprof.http") {
if rootArgs.httpPprof != "" {
go func() {
http.ListenAndServe(c.GlobalString("debug.pprof.http"), nil)
http.ListenAndServe(rootArgs.httpPprof, nil)
}()
}
// Config
if !c.GlobalIsSet("config") {
return cli.NewExitError("config flag not set", 2)
if rootArgs.configFile == "" {
log.Printf("config file not set")
os.Exit(1)
}
if conf, err = ParseConfig(c.GlobalString("config")); err != nil {
return cli.NewExitError(err, 2)
var err error
if conf, err = ParseConfig(rootArgs.configFile); err != nil {
log.Printf("error parsing config: %s", err)
os.Exit(1)
}
jobrunLogger := log.New(os.Stderr, "jobrun ", logFlags)
jobrunLogger := golog.New(os.Stderr, "jobrun ", logFlags)
runner = jobrun.NewJobRunner(jobrunLogger)
return
}
app.Commands = []cli.Command{
{
Name: "stdinserver",
Aliases: []string{"s"},
Usage: "start in stdin server mode (from authorized keys)",
Flags: []cli.Flag{
cli.StringFlag{Name: "identity"},
},
Action: cmdStdinServer,
},
{
Name: "run",
Aliases: []string{"r"},
Usage: "do replication",
Action: cmdRun,
Flags: []cli.Flag{
cli.StringFlag{Name: "job"},
cli.BoolFlag{
Name: "once",
Usage: "run jobs only once, regardless of configured repeat behavior",
},
},
},
{
Name: "prune",
Action: cmdPrune,
Flags: []cli.Flag{
cli.StringFlag{Name: "job"},
cli.BoolFlag{Name: "n", Usage: "simulation (dry run)"},
},
},
{
Name: "autosnap",
Action: cmdAutosnap,
Flags: []cli.Flag{
cli.StringFlag{Name: "job"},
},
},
}
app.Run(os.Args)
}
func cmdStdinServer(c *cli.Context) (err error) {
if !c.IsSet("identity") {
return cli.NewExitError("identity flag not set", 2)
}
identity := c.String("identity")
var sshByteStream io.ReadWriteCloser
if sshByteStream, err = sshbytestream.Incoming(); err != nil {
return
}
findMapping := func(cm []ClientMapping, identity string) zfs.DatasetMapping {
for i := range cm {
if cm[i].From == identity {
return cm[i].Mapping
}
}
return nil
}
sinkMapping := func(identity string) (sink zfs.DatasetMapping, err error) {
if sink = findMapping(conf.Sinks, identity); sink == nil {
return nil, fmt.Errorf("could not find sink for dataset")
}
return
}
sinkLogger := log.New(logOut, fmt.Sprintf("sink[%s] ", identity), logFlags)
handler := Handler{
Logger: sinkLogger,
SinkMappingFunc: sinkMapping,
PullACL: findMapping(conf.PullACLs, identity),
}
if err = rpc.ListenByteStreamRPC(sshByteStream, identity, handler, sinkLogger); err != nil {
//os.Exit(1)
err = cli.NewExitError(err, 1)
defaultLog.Printf("listenbytestreamerror: %#v\n", err)
}
return
}
func cmdRun(c *cli.Context) error {
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
runner.Start()
}()
jobs := make([]jobrun.Job, len(conf.Pulls)+len(conf.Pushs))
i := 0
for _, pull := range conf.Pulls {
jobs[i] = jobrun.Job{
Name: fmt.Sprintf("pull.%d", i),
RepeatStrategy: pull.RepeatStrategy,
RunFunc: func(log jobrun.Logger) error {
log.Printf("doing pull: %v", pull)
return jobPull(pull, c, log)
},
}
i++
}
for _, push := range conf.Pushs {
jobs[i] = jobrun.Job{
Name: fmt.Sprintf("push.%d", i),
RepeatStrategy: push.RepeatStrategy,
RunFunc: func(log jobrun.Logger) error {
log.Printf("doing push: %v", push)
return jobPush(push, c, log)
},
}
i++
}
for _, j := range jobs {
if c.IsSet("once") {
j.RepeatStrategy = jobrun.NoRepeatStrategy{}
}
if c.IsSet("job") {
if c.String("job") == j.Name {
runner.AddJob(j)
break
}
continue
}
runner.AddJob(j)
}
for {
select {
case job := <-runner.NotificationChan():
log.Printf("job %s reported error: %v\n", job.Name, job.LastError)
}
}
wg.Wait()
return nil
}
func jobPull(pull Pull, c *cli.Context, log jobrun.Logger) (err error) {
if lt, ok := pull.From.Transport.(LocalTransport); ok {
lt.SetHandler(Handler{
Logger: log,
PullACL: pull.Mapping,
})
pull.From.Transport = lt
log.Printf("fixing up local transport: %#v", pull.From.Transport)
}
var remote rpc.RPCRequester
if remote, err = pull.From.Transport.Connect(log); err != nil {
return
}
defer closeRPCWithTimeout(log, remote, time.Second*10, "")
return doPull(PullContext{remote, log, pull.Mapping, pull.InitialReplPolicy})
}
func jobPush(push Push, c *cli.Context, log jobrun.Logger) (err error) {
if _, ok := push.To.Transport.(LocalTransport); ok {
panic("no support for local pushs")
}
var remote rpc.RPCRequester
if remote, err = push.To.Transport.Connect(log); err != nil {
return err
}
defer closeRPCWithTimeout(log, remote, time.Second*10, "")
log.Printf("building handler for PullMeRequest")
handler := Handler{
Logger: log,
PullACL: push.Filter,
SinkMappingFunc: nil, // no need for that in the handler for PullMe
}
log.Printf("handler: %#v", handler)
r := rpc.PullMeRequest{
InitialReplPolicy: push.InitialReplPolicy,
}
log.Printf("doing PullMeRequest: %#v", r)
if err = remote.PullMeRequest(r, handler); err != nil {
log.Printf("PullMeRequest failed: %s", err)
return
}
log.Printf("push job finished")
return
}
func cmdPrune(c *cli.Context) error {
log := defaultLog
jobFailed := false
log.Printf("retending...")
for _, prune := range conf.Prunes {
if !c.IsSet("job") || (c.IsSet("job") && c.String("job") == prune.Name) {
log.Printf("Beginning prune job:\n%s", prune)
ctx := PruneContext{prune, time.Now(), c.IsSet("n")}
err := doPrune(ctx, log)
if err != nil {
jobFailed = true
log.Printf("Prune job failed with error: %s", err)
}
log.Printf("\n")
}
}
if jobFailed {
return cli.NewExitError("At least one job failed with an error. Check log for details.", 1)
}
return nil
}
func cmdAutosnap(c *cli.Context) error {
log := defaultLog
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
runner.Start()
}()
log.Printf("autosnap...")
for i := range conf.Autosnaps {
snap := conf.Autosnaps[i]
if !c.IsSet("job") || (c.IsSet("job") && c.String("job") == snap.Name) {
job := jobrun.Job{
Name: fmt.Sprintf("autosnap.%s", snap.Name),
RepeatStrategy: snap.Interval,
RunFunc: func(log jobrun.Logger) error {
log.Printf("doing autosnap: %v", snap)
ctx := AutosnapContext{snap}
return doAutosnap(ctx, log)
},
}
runner.AddJob(job)
}
}
wg.Wait()
return nil
}

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@ -1,13 +1,61 @@
package main
package cmd
import (
"fmt"
"github.com/spf13/cobra"
"github.com/zrepl/zrepl/util"
"github.com/zrepl/zrepl/zfs"
"os"
"sort"
"time"
)
var pruneArgs struct {
job string
dryRun bool
}
var PruneCmd = &cobra.Command{
Use: "prune",
Short: "perform pruning",
Run: cmdPrune,
}
func init() {
PruneCmd.Flags().StringVar(&pruneArgs.job, "job", "", "job to run")
PruneCmd.Flags().BoolVarP(&pruneArgs.dryRun, "dryrun", "n", false, "dry run")
RootCmd.AddCommand(PruneCmd)
}
func cmdPrune(cmd *cobra.Command, args []string) {
jobFailed := false
log.Printf("retending...")
for _, prune := range conf.Prunes {
if pruneArgs.job == "" || pruneArgs.job == prune.Name {
log.Printf("Beginning prune job:\n%s", prune)
ctx := PruneContext{prune, time.Now(), pruneArgs.dryRun}
err := doPrune(ctx, log)
if err != nil {
jobFailed = true
log.Printf("Prune job failed with error: %s", err)
}
log.Printf("\n")
}
}
if jobFailed {
log.Printf("At least one job failed with an error. Check log for details.")
os.Exit(1)
}
}
type PruneContext struct {
Prune Prune
Now time.Time

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@ -1,13 +1,150 @@
package main
package cmd
import (
"fmt"
"github.com/spf13/cobra"
"github.com/zrepl/zrepl/jobrun"
"github.com/zrepl/zrepl/rpc"
"github.com/zrepl/zrepl/zfs"
"io"
"sync"
"time"
)
var runArgs struct {
job string
once bool
}
var RunCmd = &cobra.Command{
Use: "run",
Short: "run push & pull replication",
Run: cmdRun,
}
func init() {
RootCmd.AddCommand(RunCmd)
RunCmd.Flags().BoolVar(&runArgs.once, "once", false, "run jobs only once, regardless of configured repeat behavior")
RunCmd.Flags().StringVar(&runArgs.job, "job", "", "run only the given job")
}
func cmdRun(cmd *cobra.Command, args []string) {
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
runner.Start()
}()
jobs := make([]jobrun.Job, len(conf.Pulls)+len(conf.Pushs))
i := 0
for _, pull := range conf.Pulls {
jobs[i] = jobrun.Job{
Name: fmt.Sprintf("pull.%d", i),
RepeatStrategy: pull.RepeatStrategy,
RunFunc: func(log jobrun.Logger) error {
log.Printf("doing pull: %v", pull)
return jobPull(pull, log)
},
}
i++
}
for _, push := range conf.Pushs {
jobs[i] = jobrun.Job{
Name: fmt.Sprintf("push.%d", i),
RepeatStrategy: push.RepeatStrategy,
RunFunc: func(log jobrun.Logger) error {
log.Printf("doing push: %v", push)
return jobPush(push, log)
},
}
i++
}
for _, j := range jobs {
if runArgs.once {
j.RepeatStrategy = jobrun.NoRepeatStrategy{}
}
if runArgs.job != "" {
if runArgs.job == j.Name {
runner.AddJob(j)
break
}
continue
}
runner.AddJob(j)
}
for {
select {
case job := <-runner.NotificationChan():
log.Printf("job %s reported error: %v\n", job.Name, job.LastError)
}
}
wg.Wait()
}
func jobPull(pull Pull, log jobrun.Logger) (err error) {
if lt, ok := pull.From.Transport.(LocalTransport); ok {
lt.SetHandler(Handler{
Logger: log,
PullACL: pull.Mapping,
})
pull.From.Transport = lt
log.Printf("fixing up local transport: %#v", pull.From.Transport)
}
var remote rpc.RPCRequester
if remote, err = pull.From.Transport.Connect(log); err != nil {
return
}
defer closeRPCWithTimeout(log, remote, time.Second*10, "")
return doPull(PullContext{remote, log, pull.Mapping, pull.InitialReplPolicy})
}
func jobPush(push Push, log jobrun.Logger) (err error) {
if _, ok := push.To.Transport.(LocalTransport); ok {
panic("no support for local pushs")
}
var remote rpc.RPCRequester
if remote, err = push.To.Transport.Connect(log); err != nil {
return err
}
defer closeRPCWithTimeout(log, remote, time.Second*10, "")
log.Printf("building handler for PullMeRequest")
handler := Handler{
Logger: log,
PullACL: push.Filter,
SinkMappingFunc: nil, // no need for that in the handler for PullMe
}
log.Printf("handler: %#v", handler)
r := rpc.PullMeRequest{
InitialReplPolicy: push.InitialReplPolicy,
}
log.Printf("doing PullMeRequest: %#v", r)
if err = remote.PullMeRequest(r, handler); err != nil {
log.Printf("PullMeRequest failed: %s", err)
return
}
log.Printf("push job finished")
return
}
func closeRPCWithTimeout(log Logger, remote rpc.RPCRequester, timeout time.Duration, goodbye string) {
log.Printf("closing rpc connection")

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cmd/stdinserver.go Normal file
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@ -0,0 +1,79 @@
package cmd
import (
"fmt"
"github.com/spf13/cobra"
"github.com/zrepl/zrepl/rpc"
"github.com/zrepl/zrepl/sshbytestream"
"github.com/zrepl/zrepl/zfs"
"io"
golog "log"
"os"
)
var stdinserver struct {
identity string
}
var StdinserverCmd = &cobra.Command{
Use: "stdinserver",
Short: "start in stdin server mode (from authorized_keys file)",
Run: cmdStdinServer,
}
func init() {
StdinserverCmd.Flags().StringVar(&stdinserver.identity, "identity", "", "")
RootCmd.AddCommand(StdinserverCmd)
}
func cmdStdinServer(cmd *cobra.Command, args []string) {
var err error
defer func() {
if err != nil {
log.Printf("stdinserver exiting with error: %s", err)
os.Exit(1)
}
}()
if stdinserver.identity == "" {
err = fmt.Errorf("identity flag not set")
return
}
identity := stdinserver.identity
var sshByteStream io.ReadWriteCloser
if sshByteStream, err = sshbytestream.Incoming(); err != nil {
return
}
findMapping := func(cm []ClientMapping, identity string) zfs.DatasetMapping {
for i := range cm {
if cm[i].From == identity {
return cm[i].Mapping
}
}
return nil
}
sinkMapping := func(identity string) (sink zfs.DatasetMapping, err error) {
if sink = findMapping(conf.Sinks, identity); sink == nil {
return nil, fmt.Errorf("could not find sink for dataset")
}
return
}
sinkLogger := golog.New(logOut, fmt.Sprintf("sink[%s] ", identity), logFlags)
handler := Handler{
Logger: sinkLogger,
SinkMappingFunc: sinkMapping,
PullACL: findMapping(conf.PullACLs, identity),
}
if err = rpc.ListenByteStreamRPC(sshByteStream, identity, handler, sinkLogger); err != nil {
log.Printf("listenbytestreamerror: %#v\n", err)
os.Exit(1)
}
return
}

15
main.go Normal file
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@ -0,0 +1,15 @@
// See cmd package.
package main
import (
"github.com/zrepl/zrepl/cmd"
"log"
"os"
)
func main() {
if err := cmd.RootCmd.Execute(); err != nil {
log.Printf("error executing root command: %s", err)
os.Exit(1)
}
}