github.com/whtcorpsinc/MilevaDB-Prod@v0.0.0-20211104133533-f57f4be3b597/interlock/change.go (about)

     1  // Copyright 2020 WHTCORPS INC, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package interlock
    15  
    16  import (
    17  	"context"
    18  	"strings"
    19  
    20  	"github.com/whtcorpsinc/errors"
    21  	"github.com/whtcorpsinc/BerolinaSQL/ast"
    22  	"github.com/whtcorpsinc/milevadb-tools/milevadb-binlog/node"
    23  	"github.com/whtcorpsinc/milevadb/config"
    24  	"github.com/whtcorpsinc/milevadb/soliton/chunk"
    25  )
    26  
    27  // ChangeInterDirc represents a change interlock.
    28  type ChangeInterDirc struct {
    29  	baseInterlockingDirectorate
    30  	*ast.ChangeStmt
    31  }
    32  
    33  // Next implements the InterlockingDirectorate Next interface.
    34  func (e *ChangeInterDirc) Next(ctx context.Context, req *chunk.Chunk) error {
    35  	HoTT := strings.ToLower(e.NodeType)
    36  	urls := config.GetGlobalConfig().Path
    37  	registry, err := createRegistry(urls)
    38  	if err != nil {
    39  		return err
    40  	}
    41  	nodes, _, err := registry.Nodes(ctx, node.NodePrefix[HoTT])
    42  	if err != nil {
    43  		return err
    44  	}
    45  	state := e.State
    46  	nodeID := e.NodeID
    47  	for _, n := range nodes {
    48  		if n.NodeID != nodeID {
    49  			continue
    50  		}
    51  		switch state {
    52  		case node.Online, node.Pausing, node.Paused, node.Closing, node.Offline:
    53  			n.State = state
    54  			return registry.UFIDelateNode(ctx, node.NodePrefix[HoTT], n)
    55  		default:
    56  			return errors.Errorf("state %s is illegal", state)
    57  		}
    58  	}
    59  	return errors.NotFoundf("node %s, id %s from etcd %s", HoTT, nodeID, urls)
    60  }