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// Copyright (C) 2017-2021 Nexedi SA and Contributors.
// Kirill Smelkov <kirr@nexedi.com>
//
// This program is free software: you can Use, Study, Modify and Redistribute
// it under the terms of the GNU General Public License version 3, or (at your
// option) any later version, as published by the Free Software Foundation.
//
// You can also Link and Combine this program with other software covered by
// the terms of any of the Free Software licenses or any of the Open Source
// Initiative approved licenses and Convey the resulting work. Corresponding
// source of such a combination shall include the source code for all other
// software used.
//
// This program is distributed WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
//
// See COPYING file for full licensing terms.
// See https://www.nexedi.com/licensing for rationale and options.
package neo
// client node with ZODB storage interface for accessing NEO cluster.
import (
"context"
"fmt"
"math/rand"
"net/url"
"os"
"strings"
"sync"
// "time"
"github.com/pkg/errors"
// "golang.org/x/sync/errgroup"
"lab.nexedi.com/kirr/go123/mem"
"lab.nexedi.com/kirr/go123/xerr"
"lab.nexedi.com/kirr/go123/xnet"
"lab.nexedi.com/kirr/go123/xsync"
// "lab.nexedi.com/kirr/neo/go/internal/log"
"lab.nexedi.com/kirr/neo/go/internal/task"
// "lab.nexedi.com/kirr/neo/go/internal/xio"
"lab.nexedi.com/kirr/neo/go/internal/xurl"
"lab.nexedi.com/kirr/neo/go/internal/xzlib"
"lab.nexedi.com/kirr/neo/go/internal/xzodb"
"lab.nexedi.com/kirr/neo/go/neo/internal/xsha1"
"lab.nexedi.com/kirr/neo/go/neo/neonet"
"lab.nexedi.com/kirr/neo/go/neo/proto"
"lab.nexedi.com/kirr/neo/go/neo/xneo"
"lab.nexedi.com/kirr/neo/go/zodb"
)
// Client is NEO node that talks to NEO cluster and exposes access to it via ZODB interfaces.
type Client struct {
// node *xneo.NodeApp
node *_MasteredNode
runWG *xsync.WorkGroup
runCancel func()
// link to master - established and maintained by talkMaster.
// users retrieve it via masterLink().
mlinkMu sync.Mutex
mlink *neonet.NodeLink
mlinkReady chan struct{} // reinitialized at each new talk cycle
/*
// operational state in node is maintained by recvMaster.
// users retrieve it via withOperational().
//
// NOTE being operational means:
// - link to master established and is ok
// - .PartTab is operational wrt .NodeTab
// - .ClusterState = RUNNING <- XXX needed?
//
// however master link is accessed separately (see ^^^ and masterLink)
//
// protected by .node.StateMu
operational bool // XXX <- somehow move to NodeApp?
opReady chan struct{} // reinitialized each time state becomes non-operational
*/
// driver client <- watcher: database commits | errors.
watchq chan<- zodb.Event
head zodb.Tid // last invalidation received from server
head0 zodb.Tid // .head state on start of every talkMaster1
at0Mu sync.Mutex
at0 zodb.Tid // at0 obtained when initially connecting to server
eventq0 []*zodb.EventCommit // buffer for initial messages, until .at0 is initialized
at0Initialized bool // true after .at0 is initialized
at0Ready chan(struct{}) // ready after .at0 is initialized
ownNet bool // true if Client "owns" networker and should release it on Close
}
var _ zodb.IStorageDriver = (*Client)(nil)
// NewClient creates new client node.
//
// It will connect to master @masterAddr and identify with specified cluster name.
// Use Run to actually start running the node.
func NewClient(clusterName, masterAddr string, net xnet.Networker) *Client {
return &Client{
// node: xneo.NewNodeApp(net, proto.CLIENT, clusterName, masterAddr),
node: newMasteredNode(proto.CLIENT, clusterName, net, masterAddr),
mlinkReady: make(chan struct{}),
// operational: false,
// opReady: make(chan struct{}),
at0Ready: make(chan struct{}),
}
}
// Run starts client node and runs it until either ctx is canceled or master
// commands it to shutdown. (TODO verify M->shutdown)
func (c *Client) Run(ctx context.Context) (err error) {
defer task.Running(&ctx, "client")(&err)
// run process which performs master talk
ctx, cancel := context.WithCancel(ctx)
c.runCancel = cancel
// c.node.OnShutdown = cancel // XXX ok?
// return c.talkMaster(ctx)
// c.runWG = xsync.NewWorkGroup(ctx) // XXX create it in NewClient ? (Close also uses it)
// c.runWG.Go(c.node.talkMaster)
// c.runWG.Go(c.recvMaster)
return c.node.TalkMaster(ctx, func(ctx context.Context, mlink *neonet.NodeLink) error {
// XXX errctx ("on redial"? "connected"?)
c.head0 = c.head
wg := xsync.NewWorkGroup(ctx)
// launch master notifications receiver
wg.Go(func(ctx context.Context) error {
return c.recvMaster(ctx)
})
// init lastTid from master
// TODO better change protocol for master to send us head via notify
// channel right after identification.
wg.Go(func(ctx context.Context) error {
return c.initFromMaster(ctx, mlink)
})
return wg.Wait()
})
// return c.runWG.Wait()
}
// Close implements zodb.IStorageDriver.
func (c *Client) Close() (err error) {
c.runCancel()
err = c.runWG.Wait()
// close networker if configured to do so
if c.ownNet {
err2 := c.node.Net.Close()
if err == nil {
err = err2
}
}
return err
}
// --- connection with master ---
// masterLink returns link to primary master.
//
// NOTE that even if masterLink returns != nil, the master link can become
// non-operational at any later time. (such cases will be reported as
// ErrLinkDown returned by all mlink operations)
func (c *Client) masterLink(ctx context.Context) (*neonet.NodeLink, error) {
for {
c.mlinkMu.Lock()
mlink := c.mlink
ready := c.mlinkReady
c.mlinkMu.Unlock()
if mlink != nil {
return mlink, nil
}
select {
case <-ctx.Done():
return nil, ctx.Err()
case <-ready:
// ok - try to relock mlinkMu and read mlink again.
}
}
}
/*
// updateOperational updates .operational from current state.
//
// Must be called with .node.StateMu lock held.
//
// Returned sendReady func must be called by updateOperational caller after
// .node.StateMu lock is released - it will close current .opReady this way
// notifying .operational waiters.
//
// XXX move somehow -> NodeApp?
func (c *Client) updateOperational() (sendReady func()) {
// XXX py client does not wait for cluster state = running
operational := // c.node.ClusterState == ClusterRunning &&
c.node.PartTab.OperationalWith(c.node.NodeTab)
//fmt.Printf("\nupdateOperatinal: %v\n", operational)
//fmt.Println(c.node.PartTab)
//fmt.Println(c.node.NodeTab)
var opready chan struct{}
if operational != c.operational {
c.operational = operational
if operational {
opready = c.opReady // don't close from under StateMu
} else {
c.opReady = make(chan struct{}) // remake for next operational waiters
}
}
return func() {
if opready != nil {
//fmt.Println("updateOperational - notifying %v\n", opready)
close(opready)
}
}
}
*/
/*
// withOperational waits for cluster state to be operational.
//
// If successful it returns with operational state RLocked (c.node.StateMu) and
// unlocked otherwise.
//
// The only error possible is if provided ctx cancels.
// XXX and client stopped/closed? (ctx passed to Run cancelled)
//
// XXX change signature to call f from under withOperational ?
func (c *Client) withOperational(ctx context.Context) error {
for {
c.node.StateMu.RLock()
if c.operational {
//fmt.Printf("withOperation -> ready\n");
return nil
}
ready := c.opReady
c.node.StateMu.RUnlock()
//fmt.Printf("withOperational - waiting on %v\n", ready)
select {
case <-ctx.Done():
return ctx.Err()
case <-ready:
// ok - try to relock and read again.
}
}
}
*/
/*
func (c *Client) talkMaster1(ctx context.Context) (err error) {
mlink, accept, err := c.node.Dial(ctx, proto.MASTER, c.node.MasterAddr)
if err != nil {
// FIXME it is not only identification - e.g. ECONNREFUSED
return err
}
// FIXME vvv dup from Storage.talkMaster1
// XXX -> node.Dial / node.DialMaster ?
if accept.YourNID != c.node.MyInfo.NID {
log.Infof(ctx, "master told us to have nid=%v", accept.YourNID)
c.node.MyInfo.NID = accept.YourNID
}
wg, ctx := errgroup.WithContext(ctx) // XXX -> xsync.WorkGroup
defer xio.CloseWhenDone(ctx, mlink)()
// master pushes nodeTab and partTab to us right after identification
// XXX merge into -> node.DialMaster?
// nodeTab
mnt := proto.NotifyNodeInformation{}
_, err = mlink.Expect1(&mnt)
if err != nil {
return fmt.Errorf("after identification: %w", err)
}
// partTab
mpt := proto.SendPartitionTable{}
_, err = mlink.Expect1(&mpt)
if err != nil {
return fmt.Errorf("after identification: %w", err)
}
pt := xneo.PartTabFromDump(mpt.PTid, mpt.RowList) // TODO handle mpt.NumReplicas
log.Infof(ctx, "master initialized us with next parttab:\n%s", pt)
c.node.StateMu.Lock()
c.node.UpdateNodeTab(ctx, &mnt)
c.node.PartTab = pt
opready := c.updateOperational()
c.node.StateMu.Unlock()
opready()
// set c.mlink and notify waiters
c.mlinkMu.Lock()
c.mlink = mlink
ready := c.mlinkReady
c.mlinkReady = make(chan struct{})
c.mlinkMu.Unlock()
close(ready)
// when we are done - reset .mlink
defer func() {
c.mlinkMu.Lock()
c.mlink = nil
c.mlinkMu.Unlock()
}()
c.head0 = c.head
// launch master notifications receiver
wg.Go(func() error {
return c.recvMaster(ctx, mlink)
})
// init lastTid from master
// TODO better change protocol for master to send us head via notify
// channel right after identification.
wg.Go(func() error {
return c.initFromMaster(ctx, mlink)
})
return wg.Wait()
}
*/
// initFromMaster asks M for DB head right after identification.
func (c *Client) initFromMaster(ctx context.Context, mlink *neonet.NodeLink) (err error) {
defer task.Running(&ctx, "init")(&err)
// query last_tid
lastTxn := proto.AnswerLastTransaction{}
err = mlink.Ask1(&proto.LastTransaction{}, &lastTxn)
if err != nil {
return err
}
if c.at0Initialized {
if lastTxn.Tid != c.head0 {
return fmt.Errorf("new transactions were committed while we were disconnected from master (%s -> %s)", c.head0, lastTxn.Tid)
}
} else {
// since we read lastTid, in separate protocol exchange there is a
// chance, that by the time when lastTid was read, some new transactions
// were committed. This way lastTid will be > than some first
// transactions received by watcher via "invalidateObjects" server
// notification.
//
// filter-out first < at0 messages for this reason.
//
// TODO change NEO protocol so that when C connects to M, M sends it
// current head and guarantees to send only followup invalidation
// updates.
c.at0Mu.Lock()
c.at0 = lastTxn.Tid
c.at0Initialized = true
c.flushEventq0()
c.at0Mu.Unlock()
close(c.at0Ready)
}
return nil
}
// recvMaster receives and handles notifications from master.
func (c *Client) recvMaster(ctx context.Context) (err error) {
defer task.Running(&ctx, "rx")(&err) // XXX recheck vs talkMaster
for {
req, err := c.node.RecvM1()
if err != nil {
return err
}
err = c.recvMaster1(req.Msg)
req.Close()
if err != nil {
return err
}
}
}
// recvMaster1 handles 1 message from master.
func (c *Client) recvMaster1(msg proto.Msg) error {
switch msg := msg.(type) {
// <- committed txn
case *proto.InvalidateObjects:
return c.invalidateObjects(msg)
default:
return fmt.Errorf("unexpected message: %T", msg)
}
}
// invalidateObjects is called by recvMaster1 on receiving invalidateObjects notification.
func (c *Client) invalidateObjects(msg *proto.InvalidateObjects) error {
tid := msg.Tid
// likely no need to verify for tid↑ because IStorage watcher does it.
// However until .at0 is initialized we do not send events to IStorage,
// so double check for monotonicity here as well.
if tid <= c.head {
return fmt.Errorf("bad invalidation from master: tid not ↑: %s -> %s", c.head, tid)
}
c.head = tid
if c.watchq == nil {
return nil
}
// invalidation event received and we have to send it to .watchq
event := &zodb.EventCommit{Tid: tid, Changev: msg.OidList}
c.at0Mu.Lock()
defer c.at0Mu.Unlock()
// queue initial events until .at0 is initialized after register
// queued events will be sent to watchq by zeo ctor after initializing .at0
if !c.at0Initialized {
c.eventq0 = append(c.eventq0, event)
return nil
}
// at0 is initialized - ok to send current event if it goes > at0
if tid > c.at0 {
c.watchq <- event
}
return nil
}
// flushEventq0 flushes events queued in c.eventq0.
// must be called under .at0Mu
func (c *Client) flushEventq0() {
if !c.at0Initialized {
panic("flush, but .at0 not yet initialized")
}
if c.watchq != nil {
for _, e := range c.eventq0 {
if e.Tid > c.at0 {
c.watchq <- e
}
}
}
c.eventq0 = nil
}
// --- user API calls ---
// Sync implements zodb.IStorageDriver.
func (c *Client) Sync(ctx context.Context) (_ zodb.Tid, err error) {
defer func() {
if err != nil {
err = &zodb.OpError{URL: c.URL(), Op: "sync", Args: nil, Err: err}
}
}()
// FIXME require full withOperational ? ->
mlink, err := c.masterLink(ctx)
if err != nil {
return 0, err
}
// XXX mlink can become down while we are making the call.
// XXX do we want to return error or retry?
reply := proto.AnswerLastTransaction{}
err = mlink.Ask1(&proto.LastTransaction{}, &reply) // XXX Ask += ctx
if err != nil {
// XXX ZODBErrDecode?
return 0, err
}
return reply.Tid, nil
}
// Load implements zodb.IStorageDriver.
func (c *Client) Load(ctx context.Context, xid zodb.Xid) (buf *mem.Buf, serial zodb.Tid, err error) {
defer func() {
if err != nil {
err = &zodb.OpError{URL: c.URL(), Op: "load", Args: xid, Err: err}
}
}()
// Retrieve storages we might need to access.
storv := make([]*xneo.Node, 0, 1)
err = c.node.WithOperational(ctx, func(cs *xneo.ClusterState) error {
for _, cell := range cs.PartTab.Get(xid.Oid) {
if cell.Readable() {
stor := cs.NodeTab.Get(cell.NID)
// this storage might not yet come up
if stor != nil && stor.State == proto.RUNNING {
storv = append(storv, stor)
}
}
}
return nil
})
if err != nil {
return nil, 0, err
}
/*
err = c.withOperational(ctx)
if err != nil {
return nil, 0, err
}
// here we have cluster state operational and rlocked. Retrieve
// storages we might need to access and release the lock.
storv := make([]*xneo.Node, 0, 1)
for _, cell := range c.node.PartTab.Get(xid.Oid) {
if cell.Readable() {
stor := c.node.NodeTab.Get(cell.NID)
// this storage might not yet come up
if stor != nil && stor.State == proto.RUNNING {
storv = append(storv, stor)
}
}
}
c.node.StateMu.RUnlock()
*/
if len(storv) == 0 {
// XXX recheck it adds traceback to log -> XXX it does not -> add our Bugf which always forces +v on such error print
return nil, 0, errors.Errorf("internal inconsistency: cluster is operational, but no storages alive for oid %v", xid.Oid)
}
// XXX vvv temp stub -> TODO pick up 3 random storages and send load
// requests to them all getting the first who is the fastest to reply;
// retry from the beginning if all are found to fail?
stor := storv[rand.Intn(len(storv))]
slink, err := stor.Dial(ctx)
if err != nil {
return nil, 0, err // XXX err ctx
}
// close accept after dialed (not to deadlock if S decides to send us
// something).
slink.CloseAccept() // XXX need to close only after first real dial
// on the wire it comes as "before", not "at"
req := proto.GetObject{
Oid: xid.Oid,
Before: xzodb.At2Before(xid.At),
At: proto.INVALID_TID,
}
resp := proto.AnswerObject{}
err = slink.Ask1(&req, &resp)
if err != nil {
if e, ok := err.(*proto.Error); ok {
err = proto.ZODBErrDecode(e)
}
return nil, 0, err // XXX err context
}
buf = resp.Data
if !xsha1.Skip {
checksum := xsha1.NEOSum(buf.Data)
if checksum != resp.Checksum {
return nil, 0, fmt.Errorf("data corrupt: checksum mismatch")
}
}
if resp.Compression {
buf2 := &mem.Buf{Data: nil}
udata, err := xzlib.Decompress(buf.Data)
buf.Release()
if err != nil {
return nil, 0, fmt.Errorf("data corrupt: %v", err)
}
buf2.Data = udata
buf = buf2
}
// deletion is returned as empty data
// https://lab.nexedi.com/nexedi/neoppod/blob/c1c26894/neo/client/app.py#L464-471
if len(buf.Data) == 0 {
buf.Release()
return nil, 0, &zodb.NoDataError{Oid: xid.Oid, DeletedAt: resp.Serial}
}
// reply.NextSerial
// reply.DataSerial
return buf, resp.Serial, nil
}
// Iterate implements zodb.IStorageDriver.
func (c *Client) Iterate(ctx context.Context, tidMin, tidMax zodb.Tid) zodb.ITxnIterator {
// see notes in ../NOTES:"On iteration"
panic("TODO")
}
// ---- ZODB open/url support ----
func openClientByURL(ctx context.Context, u *url.URL, opt *zodb.DriverOptions) (_ zodb.IStorageDriver, _ zodb.Tid, err error) {
// neo(s)://[credentials@]master1,master2,...,masterN/name?options
defer xerr.Contextf(&err, "neo: open %s", u)
var ssl bool
switch u.Scheme {
case "neo": ssl = false
case "neos": ssl = true
default: return nil, zodb.InvalidTid, fmt.Errorf("invalid scheme")
}
cred := u.User.String()
x, err := xurl.ParseQuery(cred)
if err != nil {
return nil, zodb.InvalidTid, fmt.Errorf("credentials: %s", err)
}
// xpop pops k from credentials, defaulting to $NEO_<K> if envok.
xpop := func(k string, envok bool) string {
v, ok := x[k]
if !ok && envok {
v = os.Getenv("NEO_"+strings.ToUpper(k))
}
delete(x, k)
return v
}
netcfg := neonet.Config{}
netcfg.LoNode = xpop("lonode", false)
if !ssl {
if len(x) != 0 {
return nil, zodb.InvalidTid, fmt.Errorf("credentials can be specified only with neos:// scheme")
}
} else {
netcfg.CA = xpop("ca", true)
netcfg.Cert = xpop("cert", true)
netcfg.Key = xpop("key", true)
if len(x) != 0 {
return nil, zodb.InvalidTid, fmt.Errorf("invalid credentials: %v", x)
}
}
name := u.Path
if strings.HasPrefix(name, "/") {
name = name[1:]
}
if name == "" {
return nil, zodb.InvalidTid, fmt.Errorf("cluster name not specified")
}
q, err := xurl.ParseQuery(u.RawQuery)
if err != nil {
return nil, zodb.InvalidTid, err
}
if len(q) != 0 {
return nil, zodb.InvalidTid, fmt.Errorf("invalid query: %v", q)
}
if !opt.ReadOnly {
return nil, zodb.InvalidTid, fmt.Errorf("TODO write mode not implemented")
}
net, err := neonet.Join(ctx, netcfg)
if err != nil {
return nil, zodb.InvalidTid, err
}
c := NewClient(name, u.Host, net)
c.ownNet = true
c.watchq = opt.Watchq
defer func() {
if err != nil {
c.Close()
}
}()
// start client node serve loop
errq := make(chan error, 1)
go func() {
err := c.Run(context.Background()) // NOTE not ctx
// Client.Close cancels talkMaster which makes Run to return
// `client: talk master(M): context canceled`
// do not propagate this error to ZODB-level user.
if errors.Is(err, context.Canceled) {
err = nil
}
// close .watchq after serve is over
c.at0Mu.Lock()
defer c.at0Mu.Unlock()
if c.at0Initialized {
c.flushEventq0()
}
if c.watchq != nil {
if err != nil {
c.watchq <- &zodb.EventError{Err: err}
}
close(c.watchq)
}
errq <- err
}()
select {
case <-ctx.Done():
return nil, zodb.InvalidTid, ctx.Err()
case <-errq:
return nil, zodb.InvalidTid, err
case <-c.at0Ready:
return c, c.at0, nil
}
}
// URL implements zodb.IStorageDriver.
func (c *Client) URL() string {
// XXX options if such were given to open are discarded
// (but we need to be able to construct URL if Client was created via NewClient directly)
zurl := "neo"
if strings.Contains(c.node.Net.Network(), "+tls") {
zurl += "s"
}
zurl += fmt.Sprintf("://%s/%s", c.node.MasterAddr, c.node.ClusterName)
return zurl
}
func init() {
zodb.RegisterDriver("neo", openClientByURL)
zodb.RegisterDriver("neos", openClientByURL)
}