/
highavailability.go
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/
highavailability.go
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// Copyright 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package highavailability
import (
"sort"
"strconv"
"github.com/juju/errors"
"github.com/juju/loggo"
"github.com/juju/names"
"github.com/juju/juju/apiserver/common"
"github.com/juju/juju/apiserver/params"
"github.com/juju/juju/constraints"
"github.com/juju/juju/state"
)
var logger = loggo.GetLogger("juju.apiserver.highavailability")
func init() {
common.RegisterStandardFacade("HighAvailability", 2, NewHighAvailabilityAPI)
}
// HighAvailability defines the methods on the highavailability API end point.
type HighAvailability interface {
EnableHA(args params.ControllersSpecs) (params.ControllersChangeResults, error)
}
// HighAvailabilityAPI implements the HighAvailability interface and is the concrete
// implementation of the api end point.
type HighAvailabilityAPI struct {
state *state.State
resources *common.Resources
authorizer common.Authorizer
}
var _ HighAvailability = (*HighAvailabilityAPI)(nil)
// NewHighAvailabilityAPI creates a new server-side highavailability API end point.
func NewHighAvailabilityAPI(st *state.State, resources *common.Resources, authorizer common.Authorizer) (*HighAvailabilityAPI, error) {
// Only clients and environment managers can access the high availability service.
if !authorizer.AuthClient() && !authorizer.AuthModelManager() {
return nil, common.ErrPerm
}
return &HighAvailabilityAPI{
state: st,
resources: resources,
authorizer: authorizer,
}, nil
}
func (api *HighAvailabilityAPI) EnableHA(args params.ControllersSpecs) (params.ControllersChangeResults, error) {
results := params.ControllersChangeResults{Results: make([]params.ControllersChangeResult, len(args.Specs))}
for i, controllersServersSpec := range args.Specs {
result, err := EnableHASingle(api.state, controllersServersSpec)
results.Results[i].Result = result
results.Results[i].Error = common.ServerError(err)
}
return results, nil
}
// Convert machine ids to tags.
func machineIdsToTags(ids ...string) []string {
var result []string
for _, id := range ids {
result = append(result, names.NewMachineTag(id).String())
}
return result
}
// Generate a ControllersChanges structure.
func controllersChanges(change state.ControllersChanges) params.ControllersChanges {
return params.ControllersChanges{
Added: machineIdsToTags(change.Added...),
Maintained: machineIdsToTags(change.Maintained...),
Removed: machineIdsToTags(change.Removed...),
Promoted: machineIdsToTags(change.Promoted...),
Demoted: machineIdsToTags(change.Demoted...),
Converted: machineIdsToTags(change.Converted...),
}
}
// EnableHASingle applies a single ControllersServersSpec specification to the current environment.
// Exported so it can be called by the legacy client API in the client package.
func EnableHASingle(st *state.State, spec params.ControllersSpec) (params.ControllersChanges, error) {
if !st.IsController() {
return params.ControllersChanges{}, errors.New("unsupported with hosted models")
}
// Check if changes are allowed and the command may proceed.
blockChecker := common.NewBlockChecker(st)
if err := blockChecker.ChangeAllowed(); err != nil {
return params.ControllersChanges{}, errors.Trace(err)
}
// Validate the environment tag if present.
if spec.ModelTag != "" {
tag, err := names.ParseModelTag(spec.ModelTag)
if err != nil {
return params.ControllersChanges{}, errors.Errorf("invalid model tag: %v", err)
}
if _, err := st.FindEntity(tag); err != nil {
return params.ControllersChanges{}, err
}
}
series := spec.Series
if series == "" {
ssi, err := st.ControllerInfo()
if err != nil {
return params.ControllersChanges{}, err
}
// We should always have at least one voting machine
// If we *really* wanted we could just pick whatever series is
// in the majority, but really, if we always copy the value of
// the first one, then they'll stay in sync.
if len(ssi.VotingMachineIds) == 0 {
// Better than a panic()?
return params.ControllersChanges{}, errors.Errorf("internal error, failed to find any voting machines")
}
templateMachine, err := st.Machine(ssi.VotingMachineIds[0])
if err != nil {
return params.ControllersChanges{}, err
}
series = templateMachine.Series()
}
if constraints.IsEmpty(&spec.Constraints) {
// No constraints specified, so we'll use the constraints off
// a running controller.
controllerInfo, err := st.ControllerInfo()
if err != nil {
return params.ControllersChanges{}, err
}
// We'll sort the controller ids to find the smallest.
// This will typically give the initial bootstrap machine.
var controllerIds []int
for _, id := range controllerInfo.MachineIds {
idNum, err := strconv.Atoi(id)
if err != nil {
logger.Warningf("ignoring non numeric controller id %v", id)
continue
}
controllerIds = append(controllerIds, idNum)
}
if len(controllerIds) == 0 {
errors.Errorf("internal error, failed to find any controllers")
}
sort.Ints(controllerIds)
// Load the controller machine and get its constraints.
controllerId := controllerIds[0]
controller, err := st.Machine(strconv.Itoa(controllerId))
if err != nil {
return params.ControllersChanges{}, errors.Annotatef(err, "reading controller id %v", controllerId)
}
spec.Constraints, err = controller.Constraints()
if err != nil {
return params.ControllersChanges{}, errors.Annotatef(err, "reading constraints for controller id %v", controllerId)
}
}
changes, err := st.EnableHA(spec.NumControllers, spec.Constraints, series, spec.Placement)
if err != nil {
return params.ControllersChanges{}, err
}
return controllersChanges(changes), nil
}
// StopHAReplicationForUpgrade will prompt the HA cluster to enter upgrade
// mongo mode.
func (api *HighAvailabilityAPI) StopHAReplicationForUpgrade(args params.UpgradeMongoParams) (params.MongoUpgradeResults, error) {
ha, err := api.state.SetUpgradeMongoMode(args.Target)
if err != nil {
return params.MongoUpgradeResults{}, errors.Annotate(err, "cannot stop HA for ugprade")
}
members := make([]params.HAMember, len(ha.Members))
for i, m := range ha.Members {
members[i] = params.HAMember{
Tag: m.Tag,
PublicAddress: m.PublicAddress,
Series: m.Series,
}
}
return params.MongoUpgradeResults{
Master: params.HAMember{
Tag: ha.Master.Tag,
PublicAddress: ha.Master.PublicAddress,
Series: ha.Master.Series,
},
Members: members,
RsMembers: ha.RsMembers,
}, nil
}
// ResumeHAReplicationAfterUpgrade will add the upgraded members of HA
// cluster to the upgraded master.
func (api *HighAvailabilityAPI) ResumeHAReplicationAfterUpgrade(args params.ResumeReplicationParams) error {
return api.state.ResumeReplication(args.Members)
}