package clientv3
import (
"io"
pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
type (
DefragmentResponse pb.DefragmentResponse
AlarmResponse pb.AlarmResponse
AlarmMember pb.AlarmMember
StatusResponse pb.StatusResponse
)
type Maintenance interface { // AlarmList gets all active alarms.
AlarmList(ctx context.Context) (*AlarmResponse, error)
// AlarmDisarm disarms a given alarm.
AlarmDisarm(ctx context.Context, m *AlarmMember) (*AlarmResponse, error)
// Defragment defragments storage backend of the etcd member with given endpoint.
// Defragment is only needed when deleting a large number of keys and want to reclaim
// the resources.
// Defragment is an expensive operation. User should avoid defragmenting multiple members
// at the same time.
// To defragment multiple members in the cluster, user need to call defragment multiple
// times with different endpoints.
Defragment(ctx context.Context, endpoint string) (*DefragmentResponse, error)
// Status gets the status of the endpoint.
Status(ctx context.Context, endpoint string) (*StatusResponse, error)
// Snapshot provides a reader for a snapshot of a backend.
Snapshot(ctx context.Context) (io.ReadCloser, error)
}
type maintenance struct { c *Client
remote pb.MaintenanceClient
}
func NewMaintenance(c *Client) Maintenance { return &maintenance{c: c, remote: pb.NewMaintenanceClient(c.conn)} }
func (m *maintenance) AlarmList(ctx context.Context) (*AlarmResponse, error) { req := &pb.AlarmRequest{ Action: pb.AlarmRequest_GET,
MemberID: 0, // all
Alarm: pb.AlarmType_NONE, // all
}
for { resp, err := m.remote.Alarm(ctx, req, grpc.FailFast(false))
if err == nil { return (*AlarmResponse)(resp), nil
}
if isHaltErr(ctx, err) { return nil, toErr(ctx, err)
}
}
}
func (m *maintenance) AlarmDisarm(ctx context.Context, am *AlarmMember) (*AlarmResponse, error) { req := &pb.AlarmRequest{ Action: pb.AlarmRequest_DEACTIVATE,
MemberID: am.MemberID,
Alarm: am.Alarm,
}
if req.MemberID == 0 && req.Alarm == pb.AlarmType_NONE { ar, err := m.AlarmList(ctx)
if err != nil { return nil, toErr(ctx, err)
}
ret := AlarmResponse{} for _, am := range ar.Alarms { dresp, derr := m.AlarmDisarm(ctx, (*AlarmMember)(am))
if derr != nil { return nil, toErr(ctx, derr)
}
ret.Alarms = append(ret.Alarms, dresp.Alarms...)
}
return &ret, nil
}
resp, err := m.remote.Alarm(ctx, req, grpc.FailFast(false))
if err == nil { return (*AlarmResponse)(resp), nil
}
return nil, toErr(ctx, err)
}
func (m *maintenance) Defragment(ctx context.Context, endpoint string) (*DefragmentResponse, error) { conn, err := m.c.Dial(endpoint)
if err != nil { return nil, toErr(ctx, err)
}
defer conn.Close()
remote := pb.NewMaintenanceClient(conn)
resp, err := remote.Defragment(ctx, &pb.DefragmentRequest{}, grpc.FailFast(false)) if err != nil { return nil, toErr(ctx, err)
}
return (*DefragmentResponse)(resp), nil
}
func (m *maintenance) Status(ctx context.Context, endpoint string) (*StatusResponse, error) { conn, err := m.c.Dial(endpoint)
if err != nil { return nil, toErr(ctx, err)
}
defer conn.Close()
remote := pb.NewMaintenanceClient(conn)
resp, err := remote.Status(ctx, &pb.StatusRequest{}, grpc.FailFast(false)) if err != nil { return nil, toErr(ctx, err)
}
return (*StatusResponse)(resp), nil
}
func (m *maintenance) Snapshot(ctx context.Context) (io.ReadCloser, error) { ss, err := m.remote.Snapshot(ctx, &pb.SnapshotRequest{}, grpc.FailFast(false)) if err != nil { return nil, toErr(ctx, err)
}
pr, pw := io.Pipe()
go func() { for { resp, err := ss.Recv()
if err != nil { pw.CloseWithError(err)
return
}
if resp == nil && err == nil { break
}
if _, werr := pw.Write(resp.Blob); werr != nil { pw.CloseWithError(werr)
return
}
}
pw.Close()
}()
return pr, nil
}