196 lines
4.8 KiB
Go
196 lines
4.8 KiB
Go
// Copyright 2016 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package clientv3
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import (
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"io"
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"sync"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"golang.org/x/net/context"
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"google.golang.org/grpc"
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)
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type (
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DefragmentResponse pb.DefragmentResponse
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AlarmResponse pb.AlarmResponse
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AlarmMember pb.AlarmMember
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StatusResponse pb.StatusResponse
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)
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type Maintenance interface {
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// AlarmList gets all active alarms.
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AlarmList(ctx context.Context) (*AlarmResponse, error)
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// AlarmDisarm disarms a given alarm.
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AlarmDisarm(ctx context.Context, m *AlarmMember) (*AlarmResponse, error)
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// Defragment defragments storage backend of the etcd member with given endpoint.
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// Defragment is only needed when deleting a large number of keys and want to reclaim
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// the resources.
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// Defragment is an expensive operation. User should avoid defragmenting multiple members
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// at the same time.
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// To defragment multiple members in the cluster, user need to call defragment multiple
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// times with different endpoints.
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Defragment(ctx context.Context, endpoint string) (*DefragmentResponse, error)
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// Status gets the status of the endpoint.
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Status(ctx context.Context, endpoint string) (*StatusResponse, error)
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// Snapshot provides a reader for a snapshot of a backend.
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Snapshot(ctx context.Context) (io.ReadCloser, error)
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}
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type maintenance struct {
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c *Client
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mu sync.Mutex
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conn *grpc.ClientConn // conn in-use
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remote pb.MaintenanceClient
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}
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func NewMaintenance(c *Client) Maintenance {
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conn := c.ActiveConnection()
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return &maintenance{
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c: c,
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conn: conn,
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remote: pb.NewMaintenanceClient(conn),
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}
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}
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func (m *maintenance) AlarmList(ctx context.Context) (*AlarmResponse, error) {
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req := &pb.AlarmRequest{
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Action: pb.AlarmRequest_GET,
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MemberID: 0, // all
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Alarm: pb.AlarmType_NONE, // all
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}
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for {
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resp, err := m.getRemote().Alarm(ctx, req)
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if err == nil {
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return (*AlarmResponse)(resp), nil
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}
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if isHalted(ctx, err) {
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return nil, err
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}
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if err = m.switchRemote(err); err != nil {
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return nil, err
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}
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}
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}
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func (m *maintenance) AlarmDisarm(ctx context.Context, am *AlarmMember) (*AlarmResponse, error) {
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req := &pb.AlarmRequest{
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Action: pb.AlarmRequest_DEACTIVATE,
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MemberID: am.MemberID,
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Alarm: am.Alarm,
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}
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if req.MemberID == 0 && req.Alarm == pb.AlarmType_NONE {
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ar, err := m.AlarmList(ctx)
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if err != nil {
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return nil, err
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}
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ret := AlarmResponse{}
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for _, am := range ar.Alarms {
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dresp, derr := m.AlarmDisarm(ctx, (*AlarmMember)(am))
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if derr != nil {
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return nil, derr
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}
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ret.Alarms = append(ret.Alarms, dresp.Alarms...)
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}
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return &ret, nil
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}
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resp, err := m.getRemote().Alarm(ctx, req)
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if err == nil {
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return (*AlarmResponse)(resp), nil
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}
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if !isHalted(ctx, err) {
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go m.switchRemote(err)
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}
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return nil, err
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}
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func (m *maintenance) Defragment(ctx context.Context, endpoint string) (*DefragmentResponse, error) {
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conn, err := m.c.Dial(endpoint)
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if err != nil {
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return nil, err
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}
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remote := pb.NewMaintenanceClient(conn)
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resp, err := remote.Defragment(ctx, &pb.DefragmentRequest{})
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if err != nil {
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return nil, err
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}
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return (*DefragmentResponse)(resp), nil
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}
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func (m *maintenance) Status(ctx context.Context, endpoint string) (*StatusResponse, error) {
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conn, err := m.c.Dial(endpoint)
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if err != nil {
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return nil, err
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}
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remote := pb.NewMaintenanceClient(conn)
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resp, err := remote.Status(ctx, &pb.StatusRequest{})
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if err != nil {
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return nil, err
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}
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return (*StatusResponse)(resp), nil
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}
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func (m *maintenance) Snapshot(ctx context.Context) (io.ReadCloser, error) {
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ss, err := m.getRemote().Snapshot(ctx, &pb.SnapshotRequest{})
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if err != nil {
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return nil, err
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}
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pr, pw := io.Pipe()
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go func() {
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for {
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resp, err := ss.Recv()
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if err != nil {
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pw.CloseWithError(err)
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return
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}
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if resp == nil && err == nil {
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break
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}
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if _, werr := pw.Write(resp.Blob); werr != nil {
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pw.CloseWithError(werr)
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return
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}
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}
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pw.Close()
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}()
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return pr, nil
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}
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func (m *maintenance) getRemote() pb.MaintenanceClient {
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m.mu.Lock()
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defer m.mu.Unlock()
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return m.remote
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}
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func (m *maintenance) switchRemote(prevErr error) error {
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m.mu.Lock()
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defer m.mu.Unlock()
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newConn, err := m.c.retryConnection(m.conn, prevErr)
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if err != nil {
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return err
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}
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m.conn = newConn
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m.remote = pb.NewMaintenanceClient(m.conn)
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return nil
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}
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