frostfs-node/pkg/morph/event/subnet/remove_node.go

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package subnetevents
import (
"fmt"
"github.com/nspcc-dev/neo-go/pkg/rpc/response/result/subscriptions"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neofs-node/pkg/morph/client"
"github.com/nspcc-dev/neofs-node/pkg/morph/event"
)
// RemoveNode structure of subnet.RemoveNode notification from morph chain.
type RemoveNode struct {
subnetID []byte
nodeKey []byte
// txHash is used in notary environmental
// for calculating unique but same for
// all notification receivers values.
txHash util.Uint256
}
// MorphEvent implements Neo:Morph Event interface.
func (RemoveNode) MorphEvent() {}
// SubnetworkID returns a marshalled subnetID structure, defined in API.
func (rn RemoveNode) SubnetworkID() []byte { return rn.subnetID }
// Node is public key of the nodeKey that is being deleted.
func (rn RemoveNode) Node() []byte { return rn.nodeKey }
// TxHash returns hash of the TX with RemoveNode
// notification.
func (rn RemoveNode) TxHash() util.Uint256 { return rn.txHash }
const expectedItemNumRemoveNode = 2
// ParseRemoveNode parses notification into subnet event structure.
//
// Expects 2 stack items.
func ParseRemoveNode(e *subscriptions.NotificationEvent) (event.Event, error) {
var (
ev RemoveNode
err error
)
params, err := event.ParseStackArray(e)
if err != nil {
return nil, fmt.Errorf("could not parse stack items from notify event: %w", err)
}
if ln := len(params); ln != expectedItemNumRemoveNode {
return nil, event.WrongNumberOfParameters(expectedItemNumRemoveNode, ln)
}
ev.subnetID, err = client.BytesFromStackItem(params[0])
if err != nil {
return nil, fmt.Errorf("could not get raw subnetID: %w", err)
}
ev.nodeKey, err = client.BytesFromStackItem(params[1])
if err != nil {
return nil, fmt.Errorf("could not get raw public key of the node: %w", err)
}
ev.txHash = e.Container
return ev, nil
}