TrueCloudLab/frostfs-node
21
1
Fork 27
Code Issues 108 Pull requests 3 Projects Releases 1 Activity Actions

[#59] morph: Adopt updated neo-go client API for subs

Browse source 
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 committed by Gitea
parent 9ffa0d8fea
commit 533e9f8b75
4 changed files with 187 additions and 94 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

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

8
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"
@ -110,8 +113,13 @@ func New(key *keys.PrivateKey, opts ...Option) (*Client, error) {
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{}),
}

93
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 {
@ -93,20 +105,55 @@ 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 {
case e, ok = <-bChan:
case e, ok = <-nChan:
case e, ok = <-nrChan:
}
if ok {
c.routeEvent(e)
continue
}
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 the client has
// method, that happens only when a client has
// switched to the more prioritized RPC
continue
return true
}
if !c.switchRPC() {
@ -116,32 +163,14 @@ func (c *Client) notificationLoop() {
// switch client to inactive mode
c.inactiveMode()
return
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
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
}
}
}
return true
}
func (c *Client) switchToMostPrioritized() {
@ -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()

107
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:
case e, ok = <-blockRcv:
case e, ok = <-notificationRcv:
case e, ok = <-notaryReqRcv:
}
if !ok {
return
}
c.notifications <- n
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
}