func (n *Node) batchInternal(
ctx context.Context, args *roachpb.BatchRequest,
) (*roachpb.BatchResponse, error) {
// TODO(marc): grpc's authentication model (which gives credential access in
// the request handler) doesn't really fit with the current design of the
// security package (which assumes that TLS state is only given at connection
// time) - that should be fixed.
if peer, ok := peer.FromContext(ctx); ok {
if tlsInfo, ok := peer.AuthInfo.(credentials.TLSInfo); ok {
certUser, err := security.GetCertificateUser(&tlsInfo.State)
if err != nil {
return nil, err
}
if certUser != security.NodeUser {
return nil, errors.Errorf("user %s is not allowed", certUser)
}
}
}
var br *roachpb.BatchResponse
type snowballInfo struct {
syncutil.Mutex
collectedSpans [][]byte
done bool
}
var snowball *snowballInfo
if err := n.stopper.RunTaskWithErr(func() error {
const opName = "node.Batch"
sp, err := tracing.JoinOrNew(n.storeCfg.AmbientCtx.Tracer, args.TraceContext, opName)
if err != nil {
return err
}
// If this is a snowball span, it gets special treatment: It skips the
// regular tracing machinery, and we instead send the collected spans
// back with the response. This is more expensive, but then again,
// those are individual requests traced by users, so they can be.
if sp.BaggageItem(tracing.Snowball) != "" {
sp.LogEvent("delegating to snowball tracing")
sp.Finish()
snowball = new(snowballInfo)
recorder := func(rawSpan basictracer.RawSpan) {
snowball.Lock()
defer snowball.Unlock()
if snowball.done {
// This is a late span that we must discard because the request was
// already completed.
return
}
encSp, err := tracing.EncodeRawSpan(&rawSpan, nil)
if err != nil {
log.Warning(ctx, err)
}
snowball.collectedSpans = append(snowball.collectedSpans, encSp)
}
if sp, err = tracing.JoinOrNewSnowball(opName, args.TraceContext, recorder); err != nil {
return err
}
}
defer sp.Finish()
traceCtx := opentracing.ContextWithSpan(ctx, sp)
log.Event(traceCtx, args.Summary())
tStart := timeutil.Now()
var pErr *roachpb.Error
br, pErr = n.stores.Send(traceCtx, *args)
if pErr != nil {
br = &roachpb.BatchResponse{}
log.ErrEventf(traceCtx, "%T", pErr.GetDetail())
}
if br.Error != nil {
panic(roachpb.ErrorUnexpectedlySet(n.stores, br))
}
n.metrics.callComplete(timeutil.Since(tStart), pErr)
br.Error = pErr
return nil
}); err != nil {
return nil, err
}
if snowball != nil {
snowball.Lock()
br.CollectedSpans = snowball.collectedSpans
snowball.done = true
snowball.Unlock()
}
return br, nil
}
// resetForNewSQLTxn (re)initializes the txnState for a new transaction.
// It creates a new client.Txn and initializes it using the session defaults.
// txnState.State will be set to Open.
func (ts *txnState) resetForNewSQLTxn(e *Executor, s *Session) {
if ts.sp != nil {
panic(fmt.Sprintf("txnState.reset() called on ts with active span. How come "+
"finishSQLTxn() wasn't called previously? ts: %+v", ts))
}
// Reset state vars to defaults.
ts.retrying = false
ts.retryIntent = false
ts.autoRetry = false
ts.commitSeen = false
// Discard previously collected spans. We start collecting anew on
// every fresh SQL txn.
ts.CollectedSpans = nil
// Create a context for this transaction. It will include a
// root span that will contain everything executed as part of the
// upcoming SQL txn, including (automatic or user-directed) retries.
// The span is closed by finishSQLTxn().
// TODO(andrei): figure out how to close these spans on server shutdown?
ctx := s.context
var sp opentracing.Span
if traceSQL {
var err error
sp, err = tracing.JoinOrNewSnowball("coordinator", nil, func(sp basictracer.RawSpan) {
ts.CollectedSpans = append(ts.CollectedSpans, sp)
})
if err != nil {
log.Warningf(ctx, "unable to create snowball tracer: %s", err)
return
}
} else if traceSQLFor7881 {
var err error
sp, _, err = tracing.NewTracerAndSpanFor7881(func(sp basictracer.RawSpan) {
ts.CollectedSpans = append(ts.CollectedSpans, sp)
})
if err != nil {
log.Fatalf(ctx, "couldn't create a tracer for debugging #7881: %s", err)
}
} else {
if parentSp := opentracing.SpanFromContext(ctx); parentSp != nil {
// Create a child span for this SQL txn.
tracer := parentSp.Tracer()
sp = tracer.StartSpan("sql txn", opentracing.ChildOf(parentSp.Context()))
} else {
// Create a root span for this SQL txn.
tracer := e.cfg.AmbientCtx.Tracer
sp = tracer.StartSpan("sql txn")
}
}
// Put the new span in the context.
ts.sp = sp
ctx = opentracing.ContextWithSpan(ctx, sp)
ts.Ctx = ctx
ts.mon.Start(ctx, &s.mon, mon.BoundAccount{})
ts.txn = client.NewTxn(ts.Ctx, *e.cfg.DB)
ts.txn.Proto.Isolation = s.DefaultIsolationLevel
ts.State = Open
// Discard the old schemaChangers, if any.
ts.schemaChangers = schemaChangerCollection{}
}