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[#770] pkg/morph: Rename all parsers and handlers structs/interfaces

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Prepare all listening structures for notary events:
rename(add prefix/suffix 'notification') all
notification specific handlers/parsers.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
This commit is contained in:
Pavel Karpy 2021-08-12 18:24:17 +03:00 • committed by Pavel Karpy
parent c87bc70536
commit d252aa4a3e
16 changed files with 174 additions and 175 deletions
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8
pkg/morph/event/handler.go → pkg/morph/event/handlers.go
View file

@ -10,21 +10,21 @@ type Handler func(Event)
// BlockHandler is a chain block processing function.
type BlockHandler func(*block.Block)
// HandlerInfo is a structure that groups
// NotificationHandlerInfo is a structure that groups
// the parameters of the handler of particular
// contract event.
type HandlerInfo struct {
type NotificationHandlerInfo struct {
scriptHashWithType
h Handler
}
// SetHandler is an event handler setter.
func (s *HandlerInfo) SetHandler(v Handler) {
func (s *NotificationHandlerInfo) SetHandler(v Handler) {
s.h = v
}
// Handler returns an event handler.
func (s HandlerInfo) Handler() Handler {
func (s NotificationHandlerInfo) Handler() Handler {
return s.h
}

151
pkg/morph/event/listener.go
View file

@ -29,22 +29,19 @@ type Listener interface {
// it could not be started.
ListenWithError(context.Context, chan<- error)
// SetParser must set the parser of particular contract event.
// SetNotificationParser must set the parser of particular contract event.
//
// Parser of each event must be set once. All parsers must be set before Listen call.
//
// Must ignore nil parsers and all calls after listener has been started.
SetParser(ParserInfo)
SetNotificationParser(NotificationParserInfo)
// RegisterHandler must register the event handler for particular notification event of contract.
// RegisterNotificationHandler must register the event handler for particular notification event of contract.
//
// The specified handler must be called after each capture and parsing of the event
// The specified handler must be called after each capture and parsing of the event.
//
// Must ignore nil handlers.
RegisterHandler(HandlerInfo)
// Stop must stop the event listener.
Stop()
RegisterNotificationHandler(NotificationHandlerInfo)
// RegisterBlockHandler must register chain block handler.
//
@ -52,6 +49,9 @@ type Listener interface {
//
// Must ignore nil handlers.
RegisterBlockHandler(BlockHandler)
// Stop must stop the event listener.
Stop()
}
// ListenerParams is a group of parameters
@ -69,9 +69,8 @@ type listener struct {
started bool
parsers map[scriptHashWithType]Parser
handlers map[scriptHashWithType][]Handler
notificationParsers map[scriptHashWithType]NotificationParser
notificationHandlers map[scriptHashWithType][]Handler
log *zap.Logger
@ -93,10 +92,10 @@ var (
// Executes once, all subsequent calls do nothing.
//
// Returns an error if listener was already started.
func (s listener) Listen(ctx context.Context) {
s.once.Do(func() {
if err := s.listen(ctx, nil); err != nil {
s.log.Error("could not start listen to events",
func (l listener) Listen(ctx context.Context) {
l.once.Do(func() {
if err := l.listen(ctx, nil); err != nil {
l.log.Error("could not start listen to events",
zap.String("error", err.Error()),
)
}
@ -109,10 +108,10 @@ func (s listener) Listen(ctx context.Context) {
// Executes once, all subsequent calls do nothing.
//
// Returns an error if listener was already started.
func (s listener) ListenWithError(ctx context.Context, intError chan<- error) {
s.once.Do(func() {
if err := s.listen(ctx, intError); err != nil {
s.log.Error("could not start listen to events",
func (l listener) ListenWithError(ctx context.Context, intError chan<- error) {
l.once.Do(func() {
if err := l.listen(ctx, intError); err != nil {
l.log.Error("could not start listen to events",
zap.String("error", err.Error()),
)
intError <- err
@ -120,13 +119,13 @@ func (s listener) ListenWithError(ctx context.Context, intError chan<- error) {
})
}
func (s listener) listen(ctx context.Context, intError chan<- error) error {
func (l listener) listen(ctx context.Context, intError chan<- error) error {
// create the list of listening contract hashes
hashes := make([]util.Uint160, 0)
// fill the list with the contracts with set event parsers.
s.mtx.RLock()
for hashType := range s.parsers {
l.mtx.RLock()
for hashType := range l.notificationParsers {
scHash := hashType.ScriptHash()
// prevent repetitions
@ -140,30 +139,30 @@ func (s listener) listen(ctx context.Context, intError chan<- error) error {
}
// mark listener as started
s.started = true
l.started = true
s.mtx.RUnlock()
l.mtx.RUnlock()
chEvent, err := s.subscriber.SubscribeForNotification(hashes...)
chEvent, err := l.subscriber.SubscribeForNotification(hashes...)
if err != nil {
return err
}
s.listenLoop(ctx, chEvent, intError)
l.listenLoop(ctx, chEvent, intError)
return nil
}
func (s listener) listenLoop(ctx context.Context, chEvent <-chan *state.NotificationEvent, intErr chan<- error) {
func (l listener) listenLoop(ctx context.Context, chEvent <-chan *state.NotificationEvent, intErr chan<- error) {
var blockChan <-chan *block.Block
if len(s.blockHandlers) > 0 {
if len(l.blockHandlers) > 0 {
var err error
if blockChan, err = s.subscriber.BlockNotifications(); err != nil {
if blockChan, err = l.subscriber.BlockNotifications(); err != nil {
if intErr != nil {
intErr <- fmt.Errorf("could not open block notifications channel: %w", err)
} else {
s.log.Debug("could not open block notifications channel",
l.log.Debug("could not open block notifications channel",
zap.String("error", err.Error()),
)
}
@ -178,47 +177,47 @@ loop:
for {
select {
case <-ctx.Done():
s.log.Info("stop event listener by context",
l.log.Info("stop event listener by context",
zap.String("reason", ctx.Err().Error()),
)
break loop
case notifyEvent, ok := <-chEvent:
if !ok {
s.log.Warn("stop event listener by channel")
l.log.Warn("stop event listener by channel")
if intErr != nil {
intErr <- errors.New("event subscriber connection has been terminated")
}
break loop
} else if notifyEvent == nil {
s.log.Warn("nil notification event was caught")
l.log.Warn("nil notification event was caught")
continue loop
}
s.parseAndHandle(notifyEvent)
l.parseAndHandleNotification(notifyEvent)
case b, ok := <-blockChan:
if !ok {
s.log.Warn("stop event listener by block channel")
l.log.Warn("stop event listener by block channel")
if intErr != nil {
intErr <- errors.New("new block notification channel is closed")
}
break loop
} else if b == nil {
s.log.Warn("nil block was caught")
l.log.Warn("nil block was caught")
continue loop
}
// TODO: consider asynchronous execution
for i := range s.blockHandlers {
s.blockHandlers[i](b)
for i := range l.blockHandlers {
l.blockHandlers[i](b)
}
}
}
}
func (s listener) parseAndHandle(notifyEvent *state.NotificationEvent) {
log := s.log.With(
func (l listener) parseAndHandleNotification(notifyEvent *state.NotificationEvent) {
log := l.log.With(
zap.String("script hash LE", notifyEvent.ScriptHash.StringLE()),
)
@ -247,9 +246,9 @@ func (s listener) parseAndHandle(notifyEvent *state.NotificationEvent) {
keyEvent.SetScriptHash(notifyEvent.ScriptHash)
keyEvent.SetType(typEvent)
s.mtx.RLock()
parser, ok := s.parsers[keyEvent]
s.mtx.RUnlock()
l.mtx.RLock()
parser, ok := l.notificationParsers[keyEvent]
l.mtx.RUnlock()
if !ok {
log.Debug("event parser not set")
@ -268,12 +267,12 @@ func (s listener) parseAndHandle(notifyEvent *state.NotificationEvent) {
}
// handler the event
s.mtx.RLock()
handlers := s.handlers[keyEvent]
s.mtx.RUnlock()
l.mtx.RLock()
handlers := l.notificationHandlers[keyEvent]
l.mtx.RUnlock()
if len(handlers) == 0 {
log.Info("handlers for parsed notification event were not registered",
log.Info("notification handlers for parsed notification event were not registered",
zap.Any("event", event),
)
@ -285,12 +284,12 @@ func (s listener) parseAndHandle(notifyEvent *state.NotificationEvent) {
}
}
// SetParser sets the parser of particular contract event.
// SetNotificationParser sets the parser of particular contract event.
//
// Ignores nil and already set parsers.
// Ignores the parser if listener is started.
func (s listener) SetParser(p ParserInfo) {
log := s.log.With(
func (l listener) SetNotificationParser(p NotificationParserInfo) {
log := l.log.With(
zap.String("script hash LE", p.ScriptHash().StringLE()),
zap.Stringer("event type", p.getType()),
)
@ -301,29 +300,29 @@ func (s listener) SetParser(p ParserInfo) {
return
}
s.mtx.Lock()
defer s.mtx.Unlock()
l.mtx.Lock()
defer l.mtx.Unlock()
// check if the listener was started
if s.started {
if l.started {
log.Warn("listener has been already started, ignore parser")
return
}
// add event parser
if _, ok := s.parsers[p.scriptHashWithType]; !ok {
s.parsers[p.scriptHashWithType] = p.parser()
if _, ok := l.notificationParsers[p.scriptHashWithType]; !ok {
l.notificationParsers[p.scriptHashWithType] = p.parser()
}
log.Info("registered new event parser")
}
// RegisterHandler registers the handler for particular notification event of contract.
// RegisterNotificationHandler registers the handler for particular notification event of contract.
//
// Ignores nil handlers.
// Ignores handlers of event without parser.
func (s listener) RegisterHandler(p HandlerInfo) {
log := s.log.With(
func (l listener) RegisterNotificationHandler(p NotificationHandlerInfo) {
log := l.log.With(
zap.String("script hash LE", p.ScriptHash().StringLE()),
zap.Stringer("event type", p.GetType()),
)
@ -335,9 +334,9 @@ func (s listener) RegisterHandler(p HandlerInfo) {
}
// check if parser was set
s.mtx.RLock()
_, ok := s.parsers[p.scriptHashWithType]
s.mtx.RUnlock()
l.mtx.RLock()
_, ok := l.notificationParsers[p.scriptHashWithType]
l.mtx.RUnlock()
if !ok {
log.Warn("ignore handler of event w/o parser")
@ -345,28 +344,28 @@ func (s listener) RegisterHandler(p HandlerInfo) {
}
// add event handler
s.mtx.Lock()
s.handlers[p.scriptHashWithType] = append(
s.handlers[p.scriptHashWithType],
l.mtx.Lock()
l.notificationHandlers[p.scriptHashWithType] = append(
l.notificationHandlers[p.scriptHashWithType],
p.Handler(),
)
s.mtx.Unlock()
l.mtx.Unlock()
log.Info("registered new event handler")
}
// Stop closes subscription channel with remote neo node.
func (s listener) Stop() {
s.subscriber.Close()
func (l listener) Stop() {
l.subscriber.Close()
}
func (s *listener) RegisterBlockHandler(handler BlockHandler) {
func (l *listener) RegisterBlockHandler(handler BlockHandler) {
if handler == nil {
s.log.Warn("ignore nil block handler")
l.log.Warn("ignore nil block handler")
return
}
s.blockHandlers = append(s.blockHandlers, handler)
l.blockHandlers = append(l.blockHandlers, handler)
}
// NewListener create the notification event listener instance and returns Listener interface.
@ -379,11 +378,11 @@ func NewListener(p ListenerParams) (Listener, error) {
}
return &listener{
mtx: new(sync.RWMutex),
once: new(sync.Once),
parsers: make(map[scriptHashWithType]Parser),
handlers: make(map[scriptHashWithType][]Handler),
log: p.Logger,
subscriber: p.Subscriber,
mtx: new(sync.RWMutex),
once: new(sync.Once),
notificationParsers: make(map[scriptHashWithType]NotificationParser),
notificationHandlers: make(map[scriptHashWithType][]Handler),
log: p.Logger,
subscriber: p.Subscriber,
}, nil
}

18
pkg/morph/event/parser.go → pkg/morph/event/parsers.go
View file

@ -6,17 +6,17 @@ import (
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// Parser is a function that constructs Event
// NotificationParser is a function that constructs Event
// from the StackItem list.
type Parser func([]stackitem.Item) (Event, error)
type NotificationParser func([]stackitem.Item) (Event, error)
// ParserInfo is a structure that groups
// NotificationParserInfo is a structure that groups
// the parameters of particular contract
// notification event parser.
type ParserInfo struct {
type NotificationParserInfo struct {
scriptHashWithType
p Parser
p NotificationParser
}
type wrongPrmNumber struct {
@ -36,19 +36,19 @@ func (s wrongPrmNumber) Error() string {
}
// SetParser is an event parser setter.
func (s *ParserInfo) SetParser(v Parser) {
func (s *NotificationParserInfo) SetParser(v NotificationParser) {
s.p = v
}
func (s ParserInfo) parser() Parser {
func (s NotificationParserInfo) parser() NotificationParser {
return s.p
}
// SetType is an event type setter.
func (s *ParserInfo) SetType(v Type) {
func (s *NotificationParserInfo) SetType(v Type) {
s.typ = v
}
func (s ParserInfo) getType() Type {
func (s NotificationParserInfo) getType() Type {
return s.typ
}