63 lines
1.9 KiB
Go
63 lines
1.9 KiB
Go
package broadcaster
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import (
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"encoding/base64"
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"encoding/binary"
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"time"
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"github.com/nspcc-dev/neo-go/pkg/config"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/rpcclient"
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"github.com/nspcc-dev/neo-go/pkg/services/helpers/rpcbroadcaster"
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"go.uber.org/zap"
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)
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const (
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defaultSendTimeout = time.Second * 4
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defaultChanCapacity = 16
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)
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// OracleBroadcaster is an oracle broadcaster implementation.
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type OracleBroadcaster struct {
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rpcbroadcaster.RPCBroadcaster
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}
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// New returns a new struct capable of broadcasting oracle responses.
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func New(cfg config.OracleConfiguration, log *zap.Logger) *OracleBroadcaster {
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if cfg.ResponseTimeout == 0 {
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cfg.ResponseTimeout = defaultSendTimeout
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}
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r := &OracleBroadcaster{
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RPCBroadcaster: *rpcbroadcaster.NewRPCBroadcaster(log, cfg.ResponseTimeout),
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}
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for i := range cfg.Nodes {
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r.Clients[cfg.Nodes[i]] = r.NewRPCClient(cfg.Nodes[i], (*rpcclient.Client).SubmitRawOracleResponse,
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cfg.ResponseTimeout, make(chan []interface{}, defaultChanCapacity))
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}
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return r
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}
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// SendResponse implements interfaces.Broadcaster.
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func (r *OracleBroadcaster) SendResponse(priv *keys.PrivateKey, resp *transaction.OracleResponse, txSig []byte) {
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pub := priv.PublicKey()
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data := GetMessage(pub.Bytes(), resp.ID, txSig)
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msgSig := priv.Sign(data)
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params := []interface{}{
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base64.StdEncoding.EncodeToString(pub.Bytes()),
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resp.ID,
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base64.StdEncoding.EncodeToString(txSig),
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base64.StdEncoding.EncodeToString(msgSig),
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}
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r.SendParams(params)
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}
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// GetMessage returns data which is signed upon sending response by RPC.
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func GetMessage(pubBytes []byte, reqID uint64, txSig []byte) []byte {
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data := make([]byte, len(pubBytes)+8+len(txSig))
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copy(data, pubBytes)
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binary.LittleEndian.PutUint64(data[len(pubBytes):], uint64(reqID))
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copy(data[len(pubBytes)+8:], txSig)
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return data
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}
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