mirror of
https://github.com/nspcc-dev/neo-go.git
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101 lines
3.2 KiB
Go
101 lines
3.2 KiB
Go
package server
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import (
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"github.com/gorilla/websocket"
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"github.com/nspcc-dev/neo-go/pkg/core/block"
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"github.com/nspcc-dev/neo-go/pkg/core/state"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/rpc/request"
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"github.com/nspcc-dev/neo-go/pkg/rpc/response"
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"github.com/nspcc-dev/neo-go/pkg/rpc/response/result/subscriptions"
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"go.uber.org/atomic"
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)
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type (
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// subscriber is an event subscriber.
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subscriber struct {
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writer chan<- *websocket.PreparedMessage
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ws *websocket.Conn
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overflown atomic.Bool
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// These work like slots as there is not a lot of them (it's
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// cheaper doing it this way rather than creating a map),
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// pointing to an EventID is an obvious overkill at the moment, but
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// that's not for long.
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feeds [maxFeeds]feed
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}
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feed struct {
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event response.EventID
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filter interface{}
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}
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)
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const (
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// Maximum number of subscriptions per one client.
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maxFeeds = 16
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// This sets notification messages buffer depth. It may seem to be quite
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// big, but there is a big gap in speed between internal event processing
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// and networking communication that is combined with spiky nature of our
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// event generation process, which leads to lots of events generated in
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// a short time and they will put some pressure to this buffer (consider
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// ~500 invocation txs in one block with some notifications). At the same
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// time, this channel is about sending pointers, so it's doesn't cost
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// a lot in terms of memory used.
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notificationBufSize = 1024
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)
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func (f *feed) Matches(r *response.Notification) bool {
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if r.Event != f.event {
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return false
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}
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if f.filter == nil {
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return true
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}
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switch f.event {
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case response.BlockEventID:
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filt := f.filter.(request.BlockFilter)
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b := r.Payload[0].(*block.Block)
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return int(b.PrimaryIndex) == filt.Primary
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case response.TransactionEventID:
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filt := f.filter.(request.TxFilter)
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tx := r.Payload[0].(*transaction.Transaction)
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senderOK := filt.Sender == nil || tx.Sender().Equals(*filt.Sender)
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signerOK := true
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if filt.Signer != nil {
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signerOK = false
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for i := range tx.Signers {
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if tx.Signers[i].Account.Equals(*filt.Signer) {
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signerOK = true
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break
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}
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}
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}
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return senderOK && signerOK
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case response.NotificationEventID:
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filt := f.filter.(request.NotificationFilter)
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notification := r.Payload[0].(*subscriptions.NotificationEvent)
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hashOk := filt.Contract == nil || notification.ScriptHash.Equals(*filt.Contract)
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nameOk := filt.Name == nil || notification.Name == *filt.Name
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return hashOk && nameOk
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case response.ExecutionEventID:
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filt := f.filter.(request.ExecutionFilter)
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applog := r.Payload[0].(*state.AppExecResult)
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return applog.VMState.String() == filt.State
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case response.NotaryRequestEventID:
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filt := f.filter.(request.TxFilter)
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req := r.Payload[0].(*subscriptions.NotaryRequestEvent)
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senderOk := filt.Sender == nil || req.NotaryRequest.FallbackTransaction.Signers[1].Account == *filt.Sender
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signerOK := true
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if filt.Signer != nil {
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signerOK = false
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for _, signer := range req.NotaryRequest.MainTransaction.Signers {
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if signer.Account.Equals(*filt.Signer) {
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signerOK = true
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break
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}
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}
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}
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return senderOk && signerOK
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}
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return false
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}
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