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batch.go
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batch.go
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// Copyright 2014 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
//
// Author: Tobias Schottdorf
package roachpb
import (
"errors"
"fmt"
"strings"
)
// IsAdmin returns true iff the BatchRequest contains an admin request.
func (ba *BatchRequest) IsAdmin() bool {
return ba.flags()&isAdmin != 0
}
// IsWrite returns true iff the BatchRequest contains a write.
func (ba *BatchRequest) IsWrite() bool {
return (ba.flags() & isWrite) != 0
}
// IsReadOnly returns true if all requests within are read-only.
func (ba *BatchRequest) IsReadOnly() bool {
flags := ba.flags()
return (flags&isRead) != 0 && (flags&isWrite) == 0
}
// IsReverse returns true iff the BatchRequest contains a reverse request.
func (ba *BatchRequest) IsReverse() bool {
return (ba.flags() & isReverse) != 0
}
// IsPossibleTransaction returns true iff the BatchRequest contains
// requests that can be part of a transaction.
func (ba *BatchRequest) IsPossibleTransaction() bool {
return (ba.flags() & isTxn) != 0
}
// IsTransactionWrite returns true iff the BatchRequest contains a txn write.
func (ba *BatchRequest) IsTransactionWrite() bool {
return (ba.flags() & isTxnWrite) != 0
}
// IsRange returns true iff the BatchRequest contains a range request.
func (ba *BatchRequest) IsRange() bool {
return (ba.flags() & isRange) != 0
}
// GetArg returns a request of the given type if one is contained in the
// Batch. The request returned is the first of its kind, with the exception
// of EndTransaction, where it examines the very last request only.
func (ba *BatchRequest) GetArg(method Method) (Request, bool) {
// when looking for EndTransaction, just look at the last entry.
if method == EndTransaction {
if length := len(ba.Requests); length > 0 {
if req := ba.Requests[length-1].GetInner(); req.Method() == EndTransaction {
return req, true
}
}
return nil, false
}
for _, arg := range ba.Requests {
if req := arg.GetInner(); req.Method() == method {
return req, true
}
}
return nil, false
}
func (br *BatchResponse) String() string {
var str []string
for _, union := range br.Responses {
str = append(str, fmt.Sprintf("%T", union.GetInner()))
}
return strings.Join(str, ", ")
}
// First returns the first response of the given type, if possible.
func (br *BatchResponse) First() Response {
if len(br.Responses) > 0 {
return br.Responses[0].GetInner()
}
return nil
}
// Header returns a pointer to the header.
func (br *BatchResponse) Header() *BatchResponse_Header {
return &br.BatchResponse_Header
}
// IntentSpanIterate calls the passed method with the key ranges of the
// transactional writes contained in the batch.
func (ba *BatchRequest) IntentSpanIterate(fn func(key, endKey Key)) {
for _, arg := range ba.Requests {
req := arg.GetInner()
if !IsTransactionWrite(req) {
continue
}
h := req.Header()
fn(h.Key, h.EndKey)
}
}
// ResetAll resets all the contained requests to their original state.
func (br *BatchResponse) ResetAll() {
if br == nil {
return
}
for _, rsp := range br.Responses {
// TODO(tschottdorf) `rsp.Reset()` isn't enough because rsp
// isn't a pointer.
rsp.GetInner().Reset()
}
}
// Combine implements the Combinable interface. It combines each slot of the
// given request into the corresponding slot of the base response. The number
// of slots must be equal and the respective slots must be combinable.
// On error, the receiver BatchResponse is in an invalid state.
// TODO(tschottdorf): write tests.
func (br *BatchResponse) Combine(otherBatch *BatchResponse) error {
if len(otherBatch.Responses) != len(br.Responses) {
return errors.New("unable to combine batch responses of different length")
}
for i, l := 0, len(br.Responses); i < l; i++ {
valLeft := br.Responses[i].GetInner()
valRight := otherBatch.Responses[i].GetInner()
cValLeft, lOK := valLeft.(combinable)
cValRight, rOK := valRight.(combinable)
if lOK && rOK {
if err := cValLeft.combine(cValRight); err != nil {
return err
}
continue
}
// If our slot is a NoopResponse, then whatever the other batch has is
// the result. Note that the result can still be a NoopResponse, to be
// filled in by a future Combine().
if _, ok := valLeft.(*NoopResponse); ok {
br.Responses[i] = otherBatch.Responses[i]
}
}
br.Txn.Update(otherBatch.Txn)
br.CollectedSpans = append(br.CollectedSpans, otherBatch.CollectedSpans...)
return nil
}
// Add adds a request to the batch request.
func (ba *BatchRequest) Add(requests ...Request) {
for _, args := range requests {
union := RequestUnion{}
if !union.SetInner(args) {
panic(fmt.Sprintf("%T excludes %T", union, args))
}
ba.Requests = append(ba.Requests, union)
}
}
// Add adds a response to the batch response.
func (br *BatchResponse) Add(reply Response) {
union := ResponseUnion{}
if !union.SetInner(reply) {
panic(fmt.Sprintf("%T excludes %T", union, reply))
}
br.Responses = append(br.Responses, union)
}
// Methods returns a slice of the contained methods.
func (ba *BatchRequest) Methods() []Method {
var res []Method
for _, arg := range ba.Requests {
res = append(res, arg.GetInner().Method())
}
return res
}
// CreateReply creates replies for each of the contained requests, wrapped in a
// BatchResponse.
func (ba *BatchRequest) CreateReply() *BatchResponse {
br := &BatchResponse{}
for _, union := range ba.Requests {
br.Add(union.GetInner().createReply())
}
return br
}
func (ba *BatchRequest) flags() int {
var flags int
for _, union := range ba.Requests {
flags |= union.GetInner().flags()
}
return flags
}
// Split separates the requests contained in a batch so that each subset of
// requests can be executed by a Store (without changing order). In particular,
// Admin requests are always singled out and mutating requests separated from
// reads. The boolean parameter indicates whether EndTransaction should be
// special-cased: If false, an EndTransaction request will never be split into
// a new chunk (otherwise, it is treated according to its flags). This allows
// sending a whole transaction in a single Batch when addressing a single
// range.
func (ba BatchRequest) Split(canSplitET bool) [][]RequestUnion {
compatible := func(method Method, exFlags, newFlags int) bool {
// If no flags are set so far, everything goes.
if exFlags == 0 || (!canSplitET && method == EndTransaction) {
return true
}
if (newFlags & isAlone) != 0 {
return false
}
// Otherwise, the flags below must remain the same with the new
// request added.
//
// Note that we're not checking isRead: The invariants we're
// enforcing are that a batch can't mix non-writes with writes.
// Checking isRead would cause ConditionalPut and Put to conflict,
// which is not what we want.
const mask = isWrite | isAdmin | isReverse
return (mask & exFlags) == (mask & newFlags)
}
var parts [][]RequestUnion
for len(ba.Requests) > 0 {
part := ba.Requests
var gFlags int
for i, union := range ba.Requests {
args := union.GetInner()
flags := args.flags()
method := args.Method()
// Regardless of flags, a NoopRequest is always compatible.
if method == Noop {
continue
}
if !compatible(method, gFlags, flags) {
part = ba.Requests[:i]
break
}
gFlags |= flags
}
parts = append(parts, part)
ba.Requests = ba.Requests[len(part):]
}
return parts
}
// String gives a brief summary of the contained requests and keys in the batch.
// TODO(tschottdorf): the key range is useful information, but requires `keys`.
// See #2198.
func (ba BatchRequest) String() string {
var str []string
for _, arg := range ba.Requests {
req := arg.GetInner()
h := req.Header()
str = append(str, fmt.Sprintf("%s [%s,%s)", req.Method(), h.Key, h.EndKey))
}
return strings.Join(str, ", ")
}
// TODO(marc): we should assert
// var _ security.RequestWithUser = &BatchRequest{}
// here, but we need to break cycles first.
// GetUser implements security.RequestWithUser.
// KV messages are always sent by the node user.
func (*BatchRequest) GetUser() string {
// TODO(marc): we should use security.NodeUser here, but we need to break cycles first.
return "node"
}
// SetNewRequest increases the internal sequence counter of this batch request.
// The sequence counter is used for replay and reordering protection. At the
// Store, a sequence counter less than or equal to the last observed one incurs
// a transaction restart (if the request is transactional).
func (ba *BatchRequest) SetNewRequest() {
if ba.Txn == nil {
return
}
ba.Txn.Sequence++
}