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cclglue.go
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cclglue.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 storage
import (
"golang.org/x/net/context"
"github.com/cockroachdb/cockroach/pkg/roachpb"
"github.com/cockroachdb/cockroach/pkg/storage/engine"
"github.com/pkg/errors"
)
// The variables/methods here are initialized/called at init() time, often from
// the ccl packages.
func makeUnimplementedCommand(method roachpb.Method) Command {
return Command{
DeclareKeys: DefaultDeclareKeys,
Eval: func(
_ context.Context, _ engine.ReadWriter, _ CommandArgs, _ roachpb.Response,
) (EvalResult, error) {
return EvalResult{}, errors.Errorf("unimplemented command: %s", method.String())
}}
}
var writeBatchCmd = makeUnimplementedCommand(roachpb.WriteBatch)
var addSSTableCmd = makeUnimplementedCommand(roachpb.AddSSTable)
var exportCmd = makeUnimplementedCommand(roachpb.Export)
var importCmdFn ImportCmdFunc = func(context.Context, CommandArgs) (*roachpb.ImportResponse, error) {
return &roachpb.ImportResponse{}, errors.Errorf("unimplemented command: %s", roachpb.Import)
}
// SetWriteBatchCmd allows setting the function that will be called as the
// implementation of the WriteBatch command. Only allowed to be called by Init.
func SetWriteBatchCmd(cmd Command) {
// This is safe if SetWriteBatchCmd is only called at init time.
commands[roachpb.WriteBatch] = cmd
}
// SetAddSSTableCmd allows setting the function that will be called as the
// implementation of the AddSSTable command. Only allowed to be called by Init.
func SetAddSSTableCmd(cmd Command) {
// This is safe if SetAddSSTableCmd is only called at init time.
commands[roachpb.AddSSTable] = cmd
}
// SetExportCmd allows setting the function that will be called as the
// implementation of the Export command. Only allowed to be called by Init.
func SetExportCmd(cmd Command) {
// This is safe if SetExportCmd is only called at init time.
commands[roachpb.Export] = cmd
}
// ImportCmdFunc is the type of the function that will be called as the
// implementation of the Import command.
type ImportCmdFunc func(context.Context, CommandArgs) (*roachpb.ImportResponse, error)
// SetImportCmd allows setting the function that will be called as the
// implementation of the Import command. Only allowed to be called by Init.
func SetImportCmd(fn ImportCmdFunc) {
// This is safe if SetImportCmd is only called at init time.
importCmdFn = fn
}