*: decouple operator handler and server

Signed-off-by: lhy1024 <[email protected]>

go.mod

@@ -145,7 +145,7 @@ require (
 	github.com/pelletier/go-toml/v2 v2.0.1 // indirect
 	github.com/petermattis/goid v0.0.0-20211229010228-4d14c490ee36 // indirect
 	github.com/pingcap/tipb v0.0.0-20220718022156-3e2483c20a9e // indirect
-	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pkg/errors v0.9.1
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/power-devops/perfstat v0.0.0-20221212215047-62379fc7944b // indirect
 	github.com/prometheus/client_model v0.2.0 // indirect

pkg/errs/error.go

@@ -0,0 +1,42 @@
+// Copyright 2023 TiKV Project 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 errs
+
+import "github.com/pingcap/errors"
+
+var (
+	// ErrOperatorNotFound is error info for operator not found.
+	ErrOperatorNotFound = errors.New("operator not found")
+	// ErrAddOperator is error info for already have an operator when adding operator.
+	ErrAddOperator = errors.New("failed to add operator, maybe already have one")
+	// ErrRegionNotAdjacent is error info for region not adjacent.
+	ErrRegionNotAdjacent = errors.New("two regions are not adjacent")
+	// ErrRegionNotFound is error info for region not found.
+	ErrRegionNotFound = func(regionID uint64) error {
+		return errors.Errorf("region %v not found", regionID)
+	}
+	// ErrRegionAbnormalPeer is error info for region has abnormal peer.
+	ErrRegionAbnormalPeer = func(regionID uint64) error {
+		return errors.Errorf("region %v has abnormal peer", regionID)
+	}
+	// ErrStoreNotFoundByID is error info for store not found.
+	ErrStoreNotFoundByID = func(storeID uint64) error {
+		return errors.Errorf("store %v not found", storeID)
+	}
+	// ErrPluginNotFound is error info for plugin not found.
+	ErrPluginNotFound = func(pluginPath string) error {
+		return errors.Errorf("plugin is not found: %s", pluginPath)
+	}
+)