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db.go
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db.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.
package kv
import (
"fmt"
"github.com/pkg/errors"
"golang.org/x/net/context"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/peer"
"github.com/cockroachdb/cockroach/pkg/base"
"github.com/cockroachdb/cockroach/pkg/internal/client"
"github.com/cockroachdb/cockroach/pkg/roachpb"
"github.com/cockroachdb/cockroach/pkg/security"
"github.com/cockroachdb/cockroach/pkg/util/stop"
)
var allExternalMethods = [...]roachpb.Request{
roachpb.Get: &roachpb.GetRequest{},
roachpb.Put: &roachpb.PutRequest{},
roachpb.ConditionalPut: &roachpb.ConditionalPutRequest{},
roachpb.Increment: &roachpb.IncrementRequest{},
roachpb.Delete: &roachpb.DeleteRequest{},
roachpb.DeleteRange: &roachpb.DeleteRangeRequest{},
roachpb.Scan: &roachpb.ScanRequest{},
roachpb.ReverseScan: &roachpb.ReverseScanRequest{},
roachpb.BeginTransaction: &roachpb.BeginTransactionRequest{},
roachpb.EndTransaction: &roachpb.EndTransactionRequest{},
roachpb.AdminSplit: &roachpb.AdminSplitRequest{},
roachpb.AdminMerge: &roachpb.AdminMergeRequest{},
roachpb.AdminTransferLease: &roachpb.AdminTransferLeaseRequest{},
roachpb.CheckConsistency: &roachpb.CheckConsistencyRequest{},
roachpb.RangeLookup: &roachpb.RangeLookupRequest{},
roachpb.WriteBatch: &roachpb.WriteBatchRequest{},
roachpb.Export: &roachpb.ExportRequest{},
}
// A DBServer provides an HTTP server endpoint serving the key-value API.
// It accepts either JSON or serialized protobuf content types.
type DBServer struct {
context *base.Config
sender client.Sender
stopper *stop.Stopper
}
// NewDBServer allocates and returns a new DBServer.
func NewDBServer(ctx *base.Config, sender client.Sender, stopper *stop.Stopper) *DBServer {
return &DBServer{
context: ctx,
sender: sender,
stopper: stopper,
}
}
// Batch implements the roachpb.KVServer interface.
func (s *DBServer) Batch(
ctx context.Context, args *roachpb.BatchRequest,
) (br *roachpb.BatchResponse, err error) {
// TODO(marc,bdarnell): this code is duplicated in server/node.go,
// which should be fixed.
defer func() {
// We always return errors via BatchResponse.Error so structure is
// preserved; plain errors are presumed to be from the RPC
// framework and not from cockroach.
if err != nil {
if br == nil {
br = &roachpb.BatchResponse{}
}
if br.Error != nil {
panic(fmt.Sprintf(
"attempting to return both a plain error (%s) and roachpb.Error (%s)", err, br.Error))
}
br.Error = roachpb.NewError(err)
err = nil
}
}()
// 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)
}
}
}
if err = verifyRequest(args); err != nil {
return br, err
}
taskCtx := context.TODO()
err = s.stopper.RunTask(taskCtx, "kv.DBServer: batch", func(taskCtx context.Context) {
var pErr *roachpb.Error
// TODO(wiz): This is required to be a different context from the one
// provided by grpc since it has to last for the entire transaction and not
// just this one RPC call. See comment for (*TxnCoordSender).hearbeatLoop.
br, pErr = s.sender.Send(taskCtx, *args)
if pErr != nil {
br = &roachpb.BatchResponse{}
}
if br.Error != nil {
panic(roachpb.ErrorUnexpectedlySet(s.sender, br))
}
br.Error = pErr
})
return br, err
}
// verifyRequest checks for illegal inputs in request proto and
// returns an error indicating which, if any, were found.
func verifyRequest(ba *roachpb.BatchRequest) error {
for _, reqUnion := range ba.Requests {
req := reqUnion.GetInner()
if et, ok := req.(*roachpb.EndTransactionRequest); ok {
if err := verifyEndTransaction(et); err != nil {
return err
}
}
method := req.Method()
if int(method) >= len(allExternalMethods) || allExternalMethods[method] == nil {
return errors.Errorf("Batch contains an internal request %s", method)
}
}
return nil
}
func verifyEndTransaction(req *roachpb.EndTransactionRequest) error {
if req.InternalCommitTrigger != nil {
return errors.Errorf("EndTransaction request from external KV API contains commit trigger: %+v", req.InternalCommitTrigger)
}
return nil
}