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cluster.go
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cluster.go
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//
// DISCLAIMER
//
// Copyright 2016-2022 ArangoDB GmbH, Cologne, Germany
//
// 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.
//
// Copyright holder is ArangoDB GmbH, Cologne, Germany
//
package arangod
import (
"context"
driver "github.com/arangodb/go-driver"
"github.com/arangodb/kube-arangodb/pkg/util/errors"
)
// NumberOfServers is the JSON structure return for the numberOfServers API call.
type NumberOfServers struct {
Coordinators *int `json:"numberOfCoordinators,omitempty"`
DBServers *int `json:"numberOfDBServers,omitempty"`
}
// GetCoordinators returns Coordinators if not nil, otherwise 0.
func (n NumberOfServers) GetCoordinators() int {
if n.Coordinators != nil {
return *n.Coordinators
}
return 0
}
// GetDBServers returns DBServers if not nil, otherwise 0.
func (n NumberOfServers) GetDBServers() int {
if n.DBServers != nil {
return *n.DBServers
}
return 0
}
// GetNumberOfServers fetches the number of servers the cluster wants to have.
func GetNumberOfServers(ctx context.Context, conn driver.Connection) (NumberOfServers, error) {
req, err := conn.NewRequest("GET", "_admin/cluster/numberOfServers")
if err != nil {
return NumberOfServers{}, errors.WithStack(err)
}
resp, err := conn.Do(ctx, req)
if err != nil {
return NumberOfServers{}, errors.WithStack(err)
}
if err := resp.CheckStatus(200); err != nil {
return NumberOfServers{}, errors.WithStack(err)
}
var result NumberOfServers
if err := resp.ParseBody("", &result); err != nil {
return NumberOfServers{}, errors.WithStack(err)
}
return result, nil
}
// SetNumberOfServers updates the number of servers the cluster has.
func SetNumberOfServers(ctx context.Context, conn driver.Connection, noCoordinators, noDBServers *int) error {
req, err := conn.NewRequest("PUT", "_admin/cluster/numberOfServers")
if err != nil {
return errors.WithStack(err)
}
input := NumberOfServers{
Coordinators: noCoordinators,
DBServers: noDBServers,
}
if _, err := req.SetBody(input); err != nil {
return errors.WithStack(err)
}
resp, err := conn.Do(ctx, req)
if err != nil {
return errors.WithStack(err)
}
if err := resp.CheckStatus(200); err != nil {
return errors.WithStack(err)
}
return nil
}
// CleanNumberOfServers removes the server count
func CleanNumberOfServers(ctx context.Context, conn driver.Connection) error {
req, err := conn.NewRequest("PUT", "_admin/cluster/numberOfServers")
if err != nil {
return errors.WithStack(err)
}
input := map[string]interface{}{
"numberOfCoordinators": nil,
"numberOfDBServers": nil,
}
if _, err := req.SetBody(input); err != nil {
return errors.WithStack(err)
}
resp, err := conn.Do(ctx, req)
if err != nil {
return errors.WithStack(err)
}
if err := resp.CheckStatus(200); err != nil {
return errors.WithStack(err)
}
return nil
}
// RemoveServerFromCluster tries to remove a coordinator or DBServer from the cluster.
func RemoveServerFromCluster(ctx context.Context, conn driver.Connection, id driver.ServerID) error {
req, err := conn.NewRequest("POST", "_admin/cluster/removeServer")
if err != nil {
return errors.WithStack(err)
}
if _, err := req.SetBody(id); err != nil {
return errors.WithStack(err)
}
resp, err := conn.Do(ctx, req)
if err != nil {
return errors.WithStack(err)
}
if err := resp.CheckStatus(200); err != nil {
return errors.WithStack(err)
}
return nil
}