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package privval
import (
"fmt"
"time"
"github.com/tendermint/tendermint/crypto"
"github.com/tendermint/tendermint/types"
)
// SignerClient implements PrivValidator.
// Handles remote validator connections that provide signing services
type SignerClient struct {
endpoint *SignerListenerEndpoint
}
var _ types.PrivValidator = (*SignerClient)(nil)
// NewSignerClient returns an instance of SignerClient.
// it will start the endpoint (if not already started)
func NewSignerClient(endpoint *SignerListenerEndpoint) (*SignerClient, error) {
if !endpoint.IsRunning() {
if err := endpoint.Start(); err != nil {
return nil, fmt.Errorf("failed to start listener endpoint: %w", err)
}
}
return &SignerClient{endpoint: endpoint}, nil
}
// Close closes the underlying connection
func (sc *SignerClient) Close() error {
return sc.endpoint.Close()
}
// IsConnected indicates with the signer is connected to a remote signing service
func (sc *SignerClient) IsConnected() bool {
return sc.endpoint.IsConnected()
}
// WaitForConnection waits maxWait for a connection or returns a timeout error
func (sc *SignerClient) WaitForConnection(maxWait time.Duration) error {
return sc.endpoint.WaitForConnection(maxWait)
}
//--------------------------------------------------------
// Implement PrivValidator
// Ping sends a ping request to the remote signer
func (sc *SignerClient) Ping() error {
response, err := sc.endpoint.SendRequest(&PingRequest{})
if err != nil {
sc.endpoint.Logger.Error("SignerClient::Ping", "err", err)
return nil
}
_, ok := response.(*PingResponse)
if !ok {
sc.endpoint.Logger.Error("SignerClient::Ping", "err", "response != PingResponse")
return err
}
return nil
}
// GetPubKey retrieves a public key from a remote signer
// returns an error if client is not able to provide the key
func (sc *SignerClient) GetPubKey() (crypto.PubKey, error) {
response, err := sc.endpoint.SendRequest(&PubKeyRequest{})
if err != nil {
sc.endpoint.Logger.Error("SignerClient::GetPubKey", "err", err)
return nil, fmt.Errorf("send: %w", err)
}
pubKeyResp, ok := response.(*PubKeyResponse)
if !ok {
sc.endpoint.Logger.Error("SignerClient::GetPubKey", "err", "response != PubKeyResponse")
return nil, fmt.Errorf("unexpected response type %T", response)
}
if pubKeyResp.Error != nil {
sc.endpoint.Logger.Error("failed to get private validator's public key", "err", pubKeyResp.Error)
return nil, fmt.Errorf("remote error: %w", pubKeyResp.Error)
}
return pubKeyResp.PubKey, nil
}
// SignVote requests a remote signer to sign a vote
func (sc *SignerClient) SignVote(chainID string, vote *types.Vote) error {
response, err := sc.endpoint.SendRequest(&SignVoteRequest{Vote: vote})
if err != nil {
sc.endpoint.Logger.Error("SignerClient::SignVote", "err", err)
return err
}
resp, ok := response.(*SignedVoteResponse)
if !ok {
sc.endpoint.Logger.Error("SignerClient::GetPubKey", "err", "response != SignedVoteResponse")
return ErrUnexpectedResponse
}
if resp.Error != nil {
return resp.Error
}
*vote = *resp.Vote
return nil
}
// SignProposal requests a remote signer to sign a proposal
func (sc *SignerClient) SignProposal(chainID string, proposal *types.Proposal) error {
response, err := sc.endpoint.SendRequest(&SignProposalRequest{Proposal: proposal})
if err != nil {
sc.endpoint.Logger.Error("SignerClient::SignProposal", "err", err)
return err
}
resp, ok := response.(*SignedProposalResponse)
if !ok {
sc.endpoint.Logger.Error("SignerClient::SignProposal", "err", "response != SignedProposalResponse")
return ErrUnexpectedResponse
}
if resp.Error != nil {
return resp.Error
}
*proposal = *resp.Proposal
return nil
}