// rpcCallTablet wil execute the RPC on the remote server.
func (client *GoRpcTabletManagerClient) rpcCallTablet(ctx context.Context, tablet *topo.TabletInfo, name string, args, reply interface{}) error {
// create the RPC client, using ctx.Deadline if set, or no timeout.
var connectTimeout time.Duration
deadline, ok := ctx.Deadline()
if ok {
connectTimeout = deadline.Sub(time.Now())
if connectTimeout < 0 {
return fmt.Errorf("Timeout connecting to TabletManager.%v on %v", name, tablet.Alias)
}
}
rpcClient, err := bsonrpc.DialHTTP("tcp", tablet.Addr(), connectTimeout, nil)
if err != nil {
return fmt.Errorf("RPC error for %v: %v", tablet.Alias, err.Error())
}
defer rpcClient.Close()
// use the context Done() channel. Will handle context timeout.
call := rpcClient.Go(ctx, "TabletManager."+name, args, reply, nil)
select {
case <-ctx.Done():
return fmt.Errorf("Timeout waiting for TabletManager.%v to %v", name, tablet.Alias)
case <-call.Done:
if call.Error != nil {
return fmt.Errorf("Remote error for %v: %v", tablet.Alias, call.Error.Error())
} else {
return nil
}
}
}
func (client *GoRpcTabletManagerClient) Snapshot(ctx context.Context, tablet *topo.TabletInfo, sa *actionnode.SnapshotArgs, waitTime time.Duration) (<-chan *logutil.LoggerEvent, tmclient.SnapshotReplyFunc, error) {
rpcClient, err := bsonrpc.DialHTTP("tcp", tablet.Addr(), waitTime, nil)
if err != nil {
return nil, nil, err
}
logstream := make(chan *logutil.LoggerEvent, 10)
rpcstream := make(chan *gorpcproto.SnapshotStreamingReply, 10)
result := &actionnode.SnapshotReply{}
c := rpcClient.StreamGo("TabletManager.Snapshot", sa, rpcstream)
go func() {
for ssr := range rpcstream {
if ssr.Log != nil {
logstream <- ssr.Log
}
if ssr.Result != nil {
*result = *ssr.Result
}
}
close(logstream)
rpcClient.Close()
}()
return logstream, func() (*actionnode.SnapshotReply, error) {
return result, c.Error
}, nil
}
func (client *GoRpcTabletManagerClient) Restore(ctx context.Context, tablet *topo.TabletInfo, sa *actionnode.RestoreArgs, waitTime time.Duration) (<-chan *logutil.LoggerEvent, tmclient.ErrFunc, error) {
rpcClient, err := bsonrpc.DialHTTP("tcp", tablet.Addr(), waitTime, nil)
if err != nil {
return nil, nil, err
}
logstream := make(chan *logutil.LoggerEvent, 10)
c := rpcClient.StreamGo("TabletManager.Restore", sa, logstream)
return logstream, func() error {
rpcClient.Close()
return c.Error
}, nil
}
