mirror of
https://github.com/zrepl/zrepl.git
synced 2024-12-31 19:39:28 +01:00
cmd: Move replication logic to separate file.
This commit is contained in:
Christian Schwarz
parent
7ad2ed5956
commit
40fe7e643d
@ -15,10 +15,6 @@ import (
|
||||
"strings"
|
||||
)
|
||||
|
||||
const LOCAL_TRANSPORT_IDENTITY string = "local"
|
||||
|
||||
const DEFAULT_INITIAL_REPL_POLICY = InitialReplPolicyMostRecent
|
||||
|
||||
type Pool struct {
|
||||
Name string
|
||||
Transport Transport
|
||||
@ -42,22 +38,15 @@ type SSHTransport struct {
|
||||
ConnLogWriteFile string `mapstructure:"connlog_write_file"`
|
||||
}
|
||||
|
||||
type InitialReplPolicy string
|
||||
|
||||
const (
|
||||
InitialReplPolicyMostRecent InitialReplPolicy = "most_recent"
|
||||
InitialReplPolicyAll InitialReplPolicy = "all"
|
||||
)
|
||||
|
||||
type Push struct {
|
||||
To *Pool
|
||||
Datasets []zfs.DatasetPath
|
||||
InitialReplPolicy InitialReplPolicy
|
||||
InitialReplPolicy rpc.InitialReplPolicy
|
||||
}
|
||||
type Pull struct {
|
||||
From *Pool
|
||||
Mapping zfs.DatasetMapping
|
||||
InitialReplPolicy InitialReplPolicy
|
||||
InitialReplPolicy rpc.InitialReplPolicy
|
||||
}
|
||||
type ClientMapping struct {
|
||||
From string
|
||||
@ -131,8 +120,8 @@ func parsePools(v interface{}) (pools []Pool, err error) {
|
||||
pools = make([]Pool, len(asList))
|
||||
for i, p := range asList {
|
||||
|
||||
if p.Name == LOCAL_TRANSPORT_IDENTITY {
|
||||
err = errors.New(fmt.Sprintf("pool name '%s' reserved for local pulls", LOCAL_TRANSPORT_IDENTITY))
|
||||
if p.Name == rpc.LOCAL_TRANSPORT_IDENTITY {
|
||||
err = errors.New(fmt.Sprintf("pool name '%s' reserved for local pulls", rpc.LOCAL_TRANSPORT_IDENTITY))
|
||||
return
|
||||
}
|
||||
|
||||
@ -207,7 +196,7 @@ func parsePushs(v interface{}, pl poolLookup) (p []Push, err error) {
|
||||
}
|
||||
}
|
||||
|
||||
if push.InitialReplPolicy, err = parseInitialReplPolicy(e.InitialReplPolicy, DEFAULT_INITIAL_REPL_POLICY); err != nil {
|
||||
if push.InitialReplPolicy, err = parseInitialReplPolicy(e.InitialReplPolicy, rpc.DEFAULT_INITIAL_REPL_POLICY); err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
@ -235,7 +224,7 @@ func parsePulls(v interface{}, pl poolLookup) (p []Pull, err error) {
|
||||
|
||||
var fromPool *Pool
|
||||
|
||||
if e.From == LOCAL_TRANSPORT_IDENTITY {
|
||||
if e.From == rpc.LOCAL_TRANSPORT_IDENTITY {
|
||||
fromPool = &Pool{
|
||||
Name: "local",
|
||||
Transport: LocalTransport{},
|
||||
@ -252,7 +241,7 @@ func parsePulls(v interface{}, pl poolLookup) (p []Pull, err error) {
|
||||
if pull.Mapping, err = parseComboMapping(e.Mapping); err != nil {
|
||||
return
|
||||
}
|
||||
if pull.InitialReplPolicy, err = parseInitialReplPolicy(e.InitialReplPolicy, DEFAULT_INITIAL_REPL_POLICY); err != nil {
|
||||
if pull.InitialReplPolicy, err = parseInitialReplPolicy(e.InitialReplPolicy, rpc.DEFAULT_INITIAL_REPL_POLICY); err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
@ -262,7 +251,7 @@ func parsePulls(v interface{}, pl poolLookup) (p []Pull, err error) {
|
||||
return
|
||||
}
|
||||
|
||||
func parseInitialReplPolicy(v interface{}, defaultPolicy InitialReplPolicy) (p InitialReplPolicy, err error) {
|
||||
func parseInitialReplPolicy(v interface{}, defaultPolicy rpc.InitialReplPolicy) (p rpc.InitialReplPolicy, err error) {
|
||||
s, ok := v.(string)
|
||||
if !ok {
|
||||
goto err
|
||||
@ -272,9 +261,9 @@ func parseInitialReplPolicy(v interface{}, defaultPolicy InitialReplPolicy) (p I
|
||||
case s == "":
|
||||
p = defaultPolicy
|
||||
case s == "most_recent":
|
||||
p = InitialReplPolicyMostRecent
|
||||
p = rpc.InitialReplPolicyMostRecent
|
||||
case s == "all":
|
||||
p = InitialReplPolicyAll
|
||||
p = rpc.InitialReplPolicyAll
|
||||
default:
|
||||
goto err
|
||||
}
|
||||
|
||||
212
cmd/main.go
212
cmd/main.go
@ -158,7 +158,7 @@ func cmdRun(c *cli.Context) error {
|
||||
Repeats: true,
|
||||
RunFunc: func(log jobrun.Logger) error {
|
||||
log.Printf("doing pull: %v", pull)
|
||||
return doPull(pull, c, log)
|
||||
return jobPull(pull, c, log)
|
||||
},
|
||||
}
|
||||
|
||||
@ -193,33 +193,7 @@ func cmdRun(c *cli.Context) error {
|
||||
return nil
|
||||
}
|
||||
|
||||
func closeRPCWithTimeout(log Logger, remote rpc.RPCRequester, timeout time.Duration, goodbye string) {
|
||||
log.Printf("closing rpc connection")
|
||||
|
||||
ch := make(chan error)
|
||||
go func() {
|
||||
ch <- remote.CloseRequest(rpc.CloseRequest{goodbye})
|
||||
}()
|
||||
|
||||
var err error
|
||||
select {
|
||||
case <-time.After(timeout):
|
||||
err = fmt.Errorf("timeout exceeded (%s)", timeout)
|
||||
case closeRequestErr := <-ch:
|
||||
err = closeRequestErr
|
||||
}
|
||||
|
||||
if err != nil {
|
||||
log.Printf("error closing connection: %s", err)
|
||||
err = remote.ForceClose()
|
||||
if err != nil {
|
||||
log.Printf("error force-closing connection: %s", err)
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func doPull(pull Pull, c *cli.Context, log jobrun.Logger) (err error) {
|
||||
func jobPull(pull Pull, c *cli.Context, log jobrun.Logger) (err error) {
|
||||
|
||||
if lt, ok := pull.From.Transport.(LocalTransport); ok {
|
||||
lt.SetHandler(Handler{
|
||||
@ -238,185 +212,5 @@ func doPull(pull Pull, c *cli.Context, log jobrun.Logger) (err error) {
|
||||
|
||||
defer closeRPCWithTimeout(log, remote, time.Second*10, "")
|
||||
|
||||
fsr := rpc.FilesystemRequest{
|
||||
Direction: rpc.DirectionPull,
|
||||
}
|
||||
var remoteFilesystems []zfs.DatasetPath
|
||||
if remoteFilesystems, err = remote.FilesystemRequest(fsr); err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
type RemoteLocalMapping struct {
|
||||
Remote zfs.DatasetPath
|
||||
Local zfs.DatasetPath
|
||||
LocalExists bool
|
||||
}
|
||||
replMapping := make(map[string]RemoteLocalMapping, len(remoteFilesystems))
|
||||
localTraversal := zfs.NewDatasetPathForest()
|
||||
localExists, err := zfs.ZFSListFilesystemExists()
|
||||
if err != nil {
|
||||
log.Printf("cannot get local filesystems map: %s", err)
|
||||
return err
|
||||
}
|
||||
|
||||
{
|
||||
|
||||
log.Printf("mapping using %#v\n", pull.Mapping)
|
||||
for fs := range remoteFilesystems {
|
||||
var err error
|
||||
var localFs zfs.DatasetPath
|
||||
localFs, err = pull.Mapping.Map(remoteFilesystems[fs])
|
||||
if err != nil {
|
||||
if err != zfs.NoMatchError {
|
||||
log.Printf("error mapping %s: %#v\n", remoteFilesystems[fs], err)
|
||||
return err
|
||||
}
|
||||
continue
|
||||
}
|
||||
m := RemoteLocalMapping{remoteFilesystems[fs], localFs, localExists(localFs)}
|
||||
replMapping[m.Local.ToString()] = m
|
||||
localTraversal.Add(m.Local)
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
log.Printf("remoteFilesystems: %#v\nreplMapping: %#v\n", remoteFilesystems, replMapping)
|
||||
|
||||
// per fs sync, assume sorted in top-down order TODO
|
||||
|
||||
localTraversal.WalkTopDown(func(v zfs.DatasetPathVisit) bool {
|
||||
|
||||
if v.FilledIn {
|
||||
if localExists(v.Path) {
|
||||
return true
|
||||
}
|
||||
log.Printf("creating fill-in dataset %s", v.Path)
|
||||
return false
|
||||
}
|
||||
|
||||
m, ok := replMapping[v.Path.ToString()]
|
||||
if !ok {
|
||||
panic("internal inconsistency: replMapping should contain mapping for any path that was not filled in by WalkTopDown()")
|
||||
}
|
||||
|
||||
log := func(format string, args ...interface{}) {
|
||||
log.Printf("[%s => %s]: %s", m.Remote.ToString(), m.Local.ToString(), fmt.Sprintf(format, args...))
|
||||
}
|
||||
|
||||
log("mapping: %#v\n", m)
|
||||
|
||||
var versions []zfs.FilesystemVersion
|
||||
if m.LocalExists {
|
||||
if versions, err = zfs.ZFSListFilesystemVersions(m.Local); err != nil {
|
||||
log("cannot get filesystem versions, stopping...: %v\n", m.Local.ToString(), m, err)
|
||||
return false
|
||||
}
|
||||
}
|
||||
|
||||
var theirVersions []zfs.FilesystemVersion
|
||||
theirVersions, err = remote.FilesystemVersionsRequest(rpc.FilesystemVersionsRequest{
|
||||
Filesystem: m.Remote,
|
||||
})
|
||||
if err != nil {
|
||||
log("cannot fetch remote filesystem versions, stopping: %s", err)
|
||||
return false
|
||||
}
|
||||
|
||||
diff := zfs.MakeFilesystemDiff(versions, theirVersions)
|
||||
log("diff: %#v\n", diff)
|
||||
|
||||
if diff.IncrementalPath == nil {
|
||||
log("performing initial sync, following policy: %#v", pull.InitialReplPolicy)
|
||||
|
||||
if pull.InitialReplPolicy != InitialReplPolicyMostRecent {
|
||||
panic(fmt.Sprintf("policy %#v not implemented", pull.InitialReplPolicy))
|
||||
}
|
||||
|
||||
snapsOnly := make([]zfs.FilesystemVersion, 0, len(diff.MRCAPathRight))
|
||||
for s := range diff.MRCAPathRight {
|
||||
if diff.MRCAPathRight[s].Type == zfs.Snapshot {
|
||||
snapsOnly = append(snapsOnly, diff.MRCAPathRight[s])
|
||||
}
|
||||
}
|
||||
|
||||
if len(snapsOnly) < 1 {
|
||||
log("cannot perform initial sync: no remote snapshots. stopping...")
|
||||
return false
|
||||
}
|
||||
|
||||
r := rpc.InitialTransferRequest{
|
||||
Filesystem: m.Remote,
|
||||
FilesystemVersion: snapsOnly[len(snapsOnly)-1],
|
||||
}
|
||||
|
||||
log("requesting initial transfer")
|
||||
|
||||
var stream io.Reader
|
||||
if stream, err = remote.InitialTransferRequest(r); err != nil {
|
||||
log("error initial transfer request, stopping...: %s", err)
|
||||
return false
|
||||
}
|
||||
|
||||
log("received initial transfer request response. zfs recv...")
|
||||
|
||||
if err = zfs.ZFSRecv(m.Local, stream, "-u"); err != nil {
|
||||
log("error receiving stream, stopping...: %s", err)
|
||||
return false
|
||||
}
|
||||
|
||||
log("configuring properties of received filesystem")
|
||||
|
||||
if err = zfs.ZFSSet(m.Local, "readonly", "on"); err != nil {
|
||||
|
||||
}
|
||||
|
||||
log("finished initial transfer")
|
||||
|
||||
} else if len(diff.IncrementalPath) < 2 {
|
||||
log("remote and local are in sync")
|
||||
} else {
|
||||
|
||||
log("incremental transfers using path: %#v", diff.IncrementalPath)
|
||||
|
||||
for i := 0; i < len(diff.IncrementalPath)-1; i++ {
|
||||
|
||||
from, to := diff.IncrementalPath[i], diff.IncrementalPath[i+1]
|
||||
|
||||
log := func(format string, args ...interface{}) {
|
||||
log("[%s => %s]: %s", from.Name, to.Name, fmt.Sprintf(format, args...))
|
||||
}
|
||||
|
||||
r := rpc.IncrementalTransferRequest{
|
||||
Filesystem: m.Remote,
|
||||
From: from,
|
||||
To: to,
|
||||
}
|
||||
log("requesting incremental transfer: %#v", r)
|
||||
|
||||
var stream io.Reader
|
||||
if stream, err = remote.IncrementalTransferRequest(r); err != nil {
|
||||
log("error requesting incremental transfer, stopping...: %s", err.Error())
|
||||
return false
|
||||
}
|
||||
|
||||
log("receving incremental transfer")
|
||||
|
||||
if err = zfs.ZFSRecv(m.Local, stream); err != nil {
|
||||
log("error receiving stream, stopping...: %s", err)
|
||||
return false
|
||||
}
|
||||
|
||||
log("finished incremental transfer")
|
||||
|
||||
}
|
||||
|
||||
log("finished incremental transfer path")
|
||||
|
||||
}
|
||||
|
||||
return true
|
||||
|
||||
})
|
||||
|
||||
return nil
|
||||
return doPull(PullContext{remote, log, pull.Mapping, pull.InitialReplPolicy})
|
||||
}
|
||||
|
||||
232
cmd/replication.go
Normal file
232
cmd/replication.go
Normal file
@ -0,0 +1,232 @@
|
||||
package main
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"github.com/zrepl/zrepl/rpc"
|
||||
"github.com/zrepl/zrepl/zfs"
|
||||
"io"
|
||||
"time"
|
||||
)
|
||||
|
||||
func closeRPCWithTimeout(log Logger, remote rpc.RPCRequester, timeout time.Duration, goodbye string) {
|
||||
log.Printf("closing rpc connection")
|
||||
|
||||
ch := make(chan error)
|
||||
go func() {
|
||||
ch <- remote.CloseRequest(rpc.CloseRequest{goodbye})
|
||||
}()
|
||||
|
||||
var err error
|
||||
select {
|
||||
case <-time.After(timeout):
|
||||
err = fmt.Errorf("timeout exceeded (%s)", timeout)
|
||||
case closeRequestErr := <-ch:
|
||||
err = closeRequestErr
|
||||
}
|
||||
|
||||
if err != nil {
|
||||
log.Printf("error closing connection: %s", err)
|
||||
err = remote.ForceClose()
|
||||
if err != nil {
|
||||
log.Printf("error force-closing connection: %s", err)
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
type PullContext struct {
|
||||
Remote rpc.RPCRequester
|
||||
Log Logger
|
||||
Mapping zfs.DatasetMapping
|
||||
InitialReplPolicy rpc.InitialReplPolicy
|
||||
}
|
||||
|
||||
func doPull(pull PullContext) (err error) {
|
||||
|
||||
remote := pull.Remote
|
||||
log := pull.Log
|
||||
|
||||
fsr := rpc.FilesystemRequest{
|
||||
Direction: rpc.DirectionPull,
|
||||
}
|
||||
var remoteFilesystems []zfs.DatasetPath
|
||||
if remoteFilesystems, err = remote.FilesystemRequest(fsr); err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
type RemoteLocalMapping struct {
|
||||
Remote zfs.DatasetPath
|
||||
Local zfs.DatasetPath
|
||||
LocalExists bool
|
||||
}
|
||||
replMapping := make(map[string]RemoteLocalMapping, len(remoteFilesystems))
|
||||
localTraversal := zfs.NewDatasetPathForest()
|
||||
localExists, err := zfs.ZFSListFilesystemExists()
|
||||
if err != nil {
|
||||
log.Printf("cannot get local filesystems map: %s", err)
|
||||
return err
|
||||
}
|
||||
|
||||
{
|
||||
|
||||
log.Printf("mapping using %#v\n", pull.Mapping)
|
||||
for fs := range remoteFilesystems {
|
||||
var err error
|
||||
var localFs zfs.DatasetPath
|
||||
localFs, err = pull.Mapping.Map(remoteFilesystems[fs])
|
||||
if err != nil {
|
||||
if err != zfs.NoMatchError {
|
||||
log.Printf("error mapping %s: %#v\n", remoteFilesystems[fs], err)
|
||||
return err
|
||||
}
|
||||
continue
|
||||
}
|
||||
m := RemoteLocalMapping{remoteFilesystems[fs], localFs, localExists(localFs)}
|
||||
replMapping[m.Local.ToString()] = m
|
||||
localTraversal.Add(m.Local)
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
log.Printf("remoteFilesystems: %#v\nreplMapping: %#v\n", remoteFilesystems, replMapping)
|
||||
|
||||
// per fs sync, assume sorted in top-down order TODO
|
||||
|
||||
localTraversal.WalkTopDown(func(v zfs.DatasetPathVisit) bool {
|
||||
|
||||
if v.FilledIn {
|
||||
if localExists(v.Path) {
|
||||
return true
|
||||
}
|
||||
log.Printf("aborting, don't know how to create fill-in dataset %s", v.Path)
|
||||
err = fmt.Errorf("aborting, don't know how to create fill-in dataset: %s", v.Path)
|
||||
return false
|
||||
}
|
||||
|
||||
m, ok := replMapping[v.Path.ToString()]
|
||||
if !ok {
|
||||
panic("internal inconsistency: replMapping should contain mapping for any path that was not filled in by WalkTopDown()")
|
||||
}
|
||||
|
||||
log := func(format string, args ...interface{}) {
|
||||
log.Printf("[%s => %s]: %s", m.Remote.ToString(), m.Local.ToString(), fmt.Sprintf(format, args...))
|
||||
}
|
||||
|
||||
log("mapping: %#v\n", m)
|
||||
|
||||
var versions []zfs.FilesystemVersion
|
||||
if m.LocalExists {
|
||||
if versions, err = zfs.ZFSListFilesystemVersions(m.Local); err != nil {
|
||||
log("cannot get filesystem versions, stopping...: %v\n", m.Local.ToString(), m, err)
|
||||
return false
|
||||
}
|
||||
}
|
||||
|
||||
var theirVersions []zfs.FilesystemVersion
|
||||
theirVersions, err = remote.FilesystemVersionsRequest(rpc.FilesystemVersionsRequest{
|
||||
Filesystem: m.Remote,
|
||||
})
|
||||
if err != nil {
|
||||
log("cannot fetch remote filesystem versions, stopping: %s", err)
|
||||
return false
|
||||
}
|
||||
|
||||
diff := zfs.MakeFilesystemDiff(versions, theirVersions)
|
||||
log("diff: %#v\n", diff)
|
||||
|
||||
if diff.IncrementalPath == nil {
|
||||
log("performing initial sync, following policy: %#v", pull.InitialReplPolicy)
|
||||
|
||||
if pull.InitialReplPolicy != rpc.InitialReplPolicyMostRecent {
|
||||
panic(fmt.Sprintf("policy %#v not implemented", pull.InitialReplPolicy))
|
||||
}
|
||||
|
||||
snapsOnly := make([]zfs.FilesystemVersion, 0, len(diff.MRCAPathRight))
|
||||
for s := range diff.MRCAPathRight {
|
||||
if diff.MRCAPathRight[s].Type == zfs.Snapshot {
|
||||
snapsOnly = append(snapsOnly, diff.MRCAPathRight[s])
|
||||
}
|
||||
}
|
||||
|
||||
if len(snapsOnly) < 1 {
|
||||
log("cannot perform initial sync: no remote snapshots. stopping...")
|
||||
return false
|
||||
}
|
||||
|
||||
r := rpc.InitialTransferRequest{
|
||||
Filesystem: m.Remote,
|
||||
FilesystemVersion: snapsOnly[len(snapsOnly)-1],
|
||||
}
|
||||
|
||||
log("requesting initial transfer")
|
||||
|
||||
var stream io.Reader
|
||||
if stream, err = remote.InitialTransferRequest(r); err != nil {
|
||||
log("error initial transfer request, stopping...: %s", err)
|
||||
return false
|
||||
}
|
||||
|
||||
log("received initial transfer request response. zfs recv...")
|
||||
|
||||
if err = zfs.ZFSRecv(m.Local, stream, "-u"); err != nil {
|
||||
log("error receiving stream, stopping...: %s", err)
|
||||
return false
|
||||
}
|
||||
|
||||
log("configuring properties of received filesystem")
|
||||
|
||||
if err = zfs.ZFSSet(m.Local, "readonly", "on"); err != nil {
|
||||
|
||||
}
|
||||
|
||||
log("finished initial transfer")
|
||||
|
||||
} else if len(diff.IncrementalPath) < 2 {
|
||||
log("remote and local are in sync")
|
||||
} else {
|
||||
|
||||
log("incremental transfers using path: %#v", diff.IncrementalPath)
|
||||
|
||||
for i := 0; i < len(diff.IncrementalPath)-1; i++ {
|
||||
|
||||
from, to := diff.IncrementalPath[i], diff.IncrementalPath[i+1]
|
||||
|
||||
log := func(format string, args ...interface{}) {
|
||||
log("[%s => %s]: %s", from.Name, to.Name, fmt.Sprintf(format, args...))
|
||||
}
|
||||
|
||||
r := rpc.IncrementalTransferRequest{
|
||||
Filesystem: m.Remote,
|
||||
From: from,
|
||||
To: to,
|
||||
}
|
||||
log("requesting incremental transfer: %#v", r)
|
||||
|
||||
var stream io.Reader
|
||||
if stream, err = remote.IncrementalTransferRequest(r); err != nil {
|
||||
log("error requesting incremental transfer, stopping...: %s", err.Error())
|
||||
return false
|
||||
}
|
||||
|
||||
log("receving incremental transfer")
|
||||
|
||||
if err = zfs.ZFSRecv(m.Local, stream); err != nil {
|
||||
log("error receiving stream, stopping...: %s", err)
|
||||
return false
|
||||
}
|
||||
|
||||
log("finished incremental transfer")
|
||||
|
||||
}
|
||||
|
||||
log("finished incremental transfer path")
|
||||
|
||||
}
|
||||
|
||||
return true
|
||||
|
||||
})
|
||||
|
||||
return
|
||||
|
||||
}
|
||||
@ -59,6 +59,17 @@ type ByteStreamRPCProtocolVersionRequest struct {
|
||||
ClientVersion uint8
|
||||
}
|
||||
|
||||
const LOCAL_TRANSPORT_IDENTITY string = "local"
|
||||
|
||||
const DEFAULT_INITIAL_REPL_POLICY = InitialReplPolicyMostRecent
|
||||
|
||||
type InitialReplPolicy string
|
||||
|
||||
const (
|
||||
InitialReplPolicyMostRecent InitialReplPolicy = "most_recent"
|
||||
InitialReplPolicyAll InitialReplPolicy = "all"
|
||||
)
|
||||
|
||||
type CloseRequest struct {
|
||||
Goodbye string
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user