func (c *cluster) compactKV(rev int64) error {
var (
conn *grpc.ClientConn
err error
)
for _, u := range c.GRPCURLs {
conn, err = grpc.Dial(u, grpc.WithInsecure(), grpc.WithTimeout(5*time.Second))
if err != nil {
continue
}
kvc := pb.NewKVClient(conn)
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
_, err = kvc.Compact(ctx, &pb.CompactionRequest{Revision: rev})
cancel()
conn.Close()
if err == nil {
return nil
}
}
return err
}
// retryConnection establishes a new connection
func (c *Client) retryConnection(oldConn *grpc.ClientConn, err error) (*grpc.ClientConn, error) {
c.mu.Lock()
defer c.mu.Unlock()
if err != nil {
c.errors = append(c.errors, err)
}
if c.cancel == nil {
return nil, c.ctx.Err()
}
if oldConn != c.conn {
// conn has already been updated
return c.conn, nil
}
oldConn.Close()
if st, _ := oldConn.State(); st != grpc.Shutdown {
// wait for shutdown so grpc doesn't leak sleeping goroutines
oldConn.WaitForStateChange(c.ctx, st)
}
conn, dialErr := c.cfg.RetryDialer(c)
if dialErr != nil {
c.errors = append(c.errors, dialErr)
return nil, dialErr
}
c.conn = conn
return c.conn, nil
}
func tearDown(s *grpc.Server, cc *grpc.ClientConn) {
cc.Close()
s.Stop()
}