TrueCloudLab/frostfs-node
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[#59] morph: Adopt updated neo-go client API for subs

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It does not use deprecated methods anymore but also adds more code that
removes. Future refactor that will affect more components will optimize
usage of the updated API.

Signed-off-by: Pavel Karpy <p.karpy@yadro.com>
This commit is contained in:
Pavel Karpy 2023-02-22 16:04:58 +03:00
parent 34329d67ff
commit c1742e581b
4 changed files with 187 additions and 94 deletions
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7
pkg/morph/client/client.go
View file

@ -69,17 +69,12 @@ type Client struct {
// on every normal call.
switchLock *sync.RWMutex
// channel for ws notifications
notifications chan rpcclient.Notification
subsInfo // protected with switchLock
// channel for internal stop
closeChan chan struct{}
// cached subscription information
subscribedEvents map[util.Uint160]string
subscribedNotaryEvents map[util.Uint160]string
subscribedToNewBlocks bool
// indicates that Client is not able to
// establish connection to any of the
// provided RPC endpoints

30
pkg/morph/client/constructor.go
View file

@ -9,8 +9,11 @@ import (
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
lru "github.com/hashicorp/golang-lru/v2"
"github.com/nspcc-dev/neo-go/pkg/core/block"
"github.com/nspcc-dev/neo-go/pkg/core/state"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/neorpc/result"
"github.com/nspcc-dev/neo-go/pkg/rpcclient"
"github.com/nspcc-dev/neo-go/pkg/rpcclient/actor"
"github.com/nspcc-dev/neo-go/pkg/util"
@ -102,17 +105,22 @@ func New(key *keys.PrivateKey, opts ...Option) (*Client, error) {
}
cli := &Client{
cache: newClientCache(),
logger: cfg.logger,
acc: acc,
accAddr: accAddr,
signer: cfg.signer,
cfg: *cfg,
switchLock: &sync.RWMutex{},
notifications: make(chan rpcclient.Notification),
subscribedEvents: make(map[util.Uint160]string),
subscribedNotaryEvents: make(map[util.Uint160]string),
closeChan: make(chan struct{}),
cache: newClientCache(),
logger: cfg.logger,
acc: acc,
accAddr: accAddr,
signer: cfg.signer,
cfg: *cfg,
switchLock: &sync.RWMutex{},
notifications: make(chan rpcclient.Notification),
subsInfo: subsInfo{
blockRcv: make(chan *block.Block),
notificationRcv: make(chan *state.ContainedNotificationEvent),
notaryReqRcv: make(chan *result.NotaryRequestEvent),
subscribedEvents: make(map[util.Uint160]string),
subscribedNotaryEvents: make(map[util.Uint160]string),
},
closeChan: make(chan struct{}),
}
cli.endpoints.init(cfg.endpoints)

129
pkg/morph/client/multi.go
View file

@ -4,6 +4,11 @@ import (
"sort"
"time"
"github.com/nspcc-dev/neo-go/pkg/core/block"
"github.com/nspcc-dev/neo-go/pkg/core/state"
"github.com/nspcc-dev/neo-go/pkg/neorpc"
"github.com/nspcc-dev/neo-go/pkg/neorpc/result"
"github.com/nspcc-dev/neo-go/pkg/rpcclient"
"go.uber.org/zap"
)
@ -51,7 +56,8 @@ func (c *Client) switchRPC() bool {
c.logger.Info("connection to the new RPC node has been established",
zap.String("endpoint", newEndpoint))
if !c.restoreSubscriptions(cli, newEndpoint) {
subs, ok := c.restoreSubscriptions(cli, newEndpoint, false)
if !ok {
// new WS client does not allow
// restoring subscription, client
// could not work correctly =>
@ -63,6 +69,7 @@ func (c *Client) switchRPC() bool {
c.client = cli
c.setActor(act)
c.subsInfo = subs
if c.cfg.switchInterval != 0 && !c.switchIsActive.Load() &&
c.endpoints.list[c.endpoints.curr].Priority != c.endpoints.list[0].Priority {
@ -77,9 +84,14 @@ func (c *Client) switchRPC() bool {
}
func (c *Client) notificationLoop() {
var e any
var ok bool
for {
c.switchLock.RLock()
nChan := c.client.Notifications
bChan := c.blockRcv
nChan := c.notificationRcv
nrChan := c.notaryReqRcv
c.switchLock.RUnlock()
select {
@ -93,57 +105,74 @@ func (c *Client) notificationLoop() {
c.close()
return
case n, ok := <-nChan:
// notification channel is used as a connection
// state: if it is closed, the connection is
// considered to be lost
if !ok {
if closeErr := c.client.GetError(); closeErr != nil {
c.logger.Warn("switching to the next RPC node",
zap.String("reason", closeErr.Error()),
)
} else {
// neo-go client was closed by calling `Close`
// method that happens only when the client has
// switched to the more prioritized RPC
continue
}
case e, ok = <-bChan:
case e, ok = <-nChan:
case e, ok = <-nrChan:
}
if !c.switchRPC() {
c.logger.Error("could not establish connection to any RPC node")
if ok {
c.routeEvent(e)
continue
}
// could not connect to all endpoints =>
// switch client to inactive mode
c.inactiveMode()
return
}
// TODO(@carpawell): call here some callback retrieved in constructor
// of the client to allow checking chain state since during switch
// process some notification could be lost
continue
}
select {
case c.notifications <- n:
continue
case <-c.cfg.ctx.Done():
_ = c.UnsubscribeAll()
c.close()
return
case <-c.closeChan:
_ = c.UnsubscribeAll()
c.close()
return
}
if !c.reconnect() {
return
}
}
}
func (c *Client) routeEvent(e any) {
typedNotification := rpcclient.Notification{Value: e}
switch e.(type) {
case *block.Block:
typedNotification.Type = neorpc.BlockEventID
case *state.ContainedNotificationEvent:
typedNotification.Type = neorpc.NotificationEventID
case *result.NotaryRequestEvent:
typedNotification.Type = neorpc.NotaryRequestEventID
}
select {
case c.notifications <- typedNotification:
case <-c.cfg.ctx.Done():
_ = c.UnsubscribeAll()
c.close()
case <-c.closeChan:
_ = c.UnsubscribeAll()
c.close()
}
}
func (c *Client) reconnect() bool {
if closeErr := c.client.GetError(); closeErr != nil {
c.logger.Warn("switching to the next RPC node",
zap.String("reason", closeErr.Error()),
)
} else {
// neo-go client was closed by calling `Close`
// method, that happens only when a client has
// switched to the more prioritized RPC
return true
}
if !c.switchRPC() {
c.logger.Error("could not establish connection to any RPC node")
// could not connect to all endpoints =>
// switch client to inactive mode
c.inactiveMode()
return false
}
// TODO(@carpawell): call here some callback retrieved in constructor
// of the client to allow checking chain state since during switch
// process some notification could be lost
return true
}
func (c *Client) switchToMostPrioritized() {
t := time.NewTicker(c.cfg.switchInterval)
defer t.Stop()
@ -156,11 +185,12 @@ mainLoop:
return
case <-t.C:
c.switchLock.RLock()
endpointsCopy := make([]Endpoint, len(c.endpoints.list))
copy(endpointsCopy, c.endpoints.list)
currPriority := c.endpoints.list[c.endpoints.curr].Priority
highestPriority := c.endpoints.list[0].Priority
c.switchLock.RUnlock()
if currPriority == highestPriority {
@ -186,7 +216,7 @@ mainLoop:
continue
}
if c.restoreSubscriptions(cli, tryE) {
if subs, ok := c.restoreSubscriptions(cli, tryE, true); ok {
c.switchLock.Lock()
// higher priority node could have been
@ -201,6 +231,7 @@ mainLoop:
c.cache.invalidate()
c.client = cli
c.setActor(act)
c.subsInfo = subs
c.endpoints.curr = i
c.switchLock.Unlock()

115
pkg/morph/client/notifications.go
View file

@ -1,6 +1,10 @@
package client
import (
"github.com/nspcc-dev/neo-go/pkg/core/block"
"github.com/nspcc-dev/neo-go/pkg/core/state"
"github.com/nspcc-dev/neo-go/pkg/neorpc"
"github.com/nspcc-dev/neo-go/pkg/neorpc/result"
"github.com/nspcc-dev/neo-go/pkg/rpcclient"
"github.com/nspcc-dev/neo-go/pkg/util"
"go.uber.org/zap"
@ -36,7 +40,7 @@ func (c *Client) SubscribeForExecutionNotifications(contract util.Uint160) error
return nil
}
id, err := c.client.SubscribeForExecutionNotifications(&contract, nil)
id, err := c.client.ReceiveExecutionNotifications(&neorpc.NotificationFilter{Contract: &contract}, c.notificationRcv)
if err != nil {
return err
}
@ -59,17 +63,17 @@ func (c *Client) SubscribeForNewBlocks() error {
return ErrConnectionLost
}
if c.subscribedToNewBlocks {
if c.subscribedToBlocks {
// no need to subscribe one more time
return nil
}
_, err := c.client.SubscribeForNewBlocks(nil)
_, err := c.client.ReceiveBlocks(nil, c.blockRcv)
if err != nil {
return err
}
c.subscribedToNewBlocks = true
c.subscribedToBlocks = true
return nil
}
@ -99,7 +103,7 @@ func (c *Client) SubscribeForNotaryRequests(txSigner util.Uint160) error {
return nil
}
id, err := c.client.SubscribeForNotaryRequests(nil, &txSigner)
id, err := c.client.ReceiveNotaryRequests(&neorpc.TxFilter{Signer: &txSigner}, c.notaryReqRcv)
if err != nil {
return err
}
@ -187,7 +191,7 @@ func (c *Client) UnsubscribeAll() error {
// no need to unsubscribe if there are
// no active subscriptions
if len(c.subscribedEvents) == 0 && len(c.subscribedNotaryEvents) == 0 &&
!c.subscribedToNewBlocks {
!c.subscribedToBlocks {
return nil
}
@ -198,14 +202,32 @@ func (c *Client) UnsubscribeAll() error {
c.subscribedEvents = make(map[util.Uint160]string)
c.subscribedNotaryEvents = make(map[util.Uint160]string)
c.subscribedToNewBlocks = false
c.subscribedToBlocks = false
return nil
}
// restoreSubscriptions restores subscriptions according to
// cached information about them.
func (c *Client) restoreSubscriptions(cli *rpcclient.WSClient, endpoint string) bool {
// subsInfo includes channels for ws notifications;
// cached subscription information.
type subsInfo struct {
blockRcv chan *block.Block
notificationRcv chan *state.ContainedNotificationEvent
notaryReqRcv chan *result.NotaryRequestEvent
subscribedToBlocks bool
subscribedEvents map[util.Uint160]string
subscribedNotaryEvents map[util.Uint160]string
}
// restoreSubscriptions restores subscriptions according to cached
// information about them.
//
// If it is NOT a background operation switchLock MUST be held.
// Returns a pair: the second is a restoration status and the first
// one contains subscription information applied to the passed cli
// and receivers for the updated subscriptions.
// Does not change Client instance.
func (c *Client) restoreSubscriptions(cli *rpcclient.WSClient, endpoint string, background bool) (si subsInfo, ok bool) {
var (
err error
id string
@ -214,72 +236,109 @@ func (c *Client) restoreSubscriptions(cli *rpcclient.WSClient, endpoint string)
stopCh := make(chan struct{})
defer close(stopCh)
blockRcv := make(chan *block.Block)
notificationRcv := make(chan *state.ContainedNotificationEvent)
notaryReqRcv := make(chan *result.NotaryRequestEvent)
// neo-go WS client says to _always_ read notifications
// from its channel. Subscribing to any notification
// while not reading them in another goroutine may
// lead to a dead-lock, thus that async side notification
// listening while restoring subscriptions
go func() {
var e any
var ok bool
for {
select {
case <-stopCh:
return
case n, ok := <-cli.Notifications:
if !ok {
return
}
c.notifications <- n
case e, ok = <-blockRcv:
case e, ok = <-notificationRcv:
case e, ok = <-notaryReqRcv:
}
if !ok {
return
}
if background {
// background client (test) switch, no need to send
// any notification, just preventing dead-lock
continue
}
c.routeEvent(e)
}
}()
if background {
c.switchLock.RLock()
defer c.switchLock.RUnlock()
}
si.subscribedToBlocks = c.subscribedToBlocks
si.subscribedEvents = copySubsMap(c.subscribedEvents)
si.subscribedNotaryEvents = copySubsMap(c.subscribedNotaryEvents)
si.blockRcv = blockRcv
si.notificationRcv = notificationRcv
si.notaryReqRcv = notaryReqRcv
// new block events restoration
if c.subscribedToNewBlocks {
_, err = cli.SubscribeForNewBlocks(nil)
if si.subscribedToBlocks {
_, err = cli.ReceiveBlocks(nil, blockRcv)
if err != nil {
c.logger.Error("could not restore block subscription after RPC switch",
zap.String("endpoint", endpoint),
zap.Error(err),
)
return false
return
}
}
// notification events restoration
for contract := range c.subscribedEvents {
for contract := range si.subscribedEvents {
contract := contract // See https://github.com/nspcc-dev/neo-go/issues/2890
id, err = cli.SubscribeForExecutionNotifications(&contract, nil)
id, err = cli.ReceiveExecutionNotifications(&neorpc.NotificationFilter{Contract: &contract}, notificationRcv)
if err != nil {
c.logger.Error("could not restore notification subscription after RPC switch",
zap.String("endpoint", endpoint),
zap.Error(err),
)
return false
return
}
c.subscribedEvents[contract] = id
si.subscribedEvents[contract] = id
}
// notary notification events restoration
if c.notary != nil {
for signer := range c.subscribedNotaryEvents {
for signer := range si.subscribedNotaryEvents {
signer := signer // See https://github.com/nspcc-dev/neo-go/issues/2890
id, err = cli.SubscribeForNotaryRequests(nil, &signer)
id, err = cli.ReceiveNotaryRequests(&neorpc.TxFilter{Signer: &signer}, notaryReqRcv)
if err != nil {
c.logger.Error("could not restore notary notification subscription after RPC switch",
zap.String("endpoint", endpoint),
zap.Error(err),
)
return false
return
}
c.subscribedNotaryEvents[signer] = id
si.subscribedNotaryEvents[signer] = id
}
}
return true
return si, true
}
func copySubsMap(m map[util.Uint160]string) map[util.Uint160]string {
newM := make(map[util.Uint160]string, len(m))
for k, v := range m {
newM[k] = v
}
return newM
}