forked from juju/juju
/
client.go
85 lines (74 loc) · 2.53 KB
/
client.go
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// Copyright 2014 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package highavailability
import (
"github.com/juju/errors"
"github.com/juju/loggo"
"github.com/juju/replicaset"
"github.com/juju/juju/api/base"
"github.com/juju/juju/apiserver/params"
"github.com/juju/juju/constraints"
"github.com/juju/juju/mongo"
)
var logger = loggo.GetLogger("juju.api.highavailability")
// Client provides access to the high availability service, used to manage controllers.
type Client struct {
base.ClientFacade
facade base.FacadeCaller
}
// NewClient returns a new HighAvailability client.
func NewClient(caller base.APICallCloser) *Client {
frontend, backend := base.NewClientFacade(caller, "HighAvailability")
return &Client{ClientFacade: frontend, facade: backend}
}
// EnableHA ensures the availability of Juju controllers.
func (c *Client) EnableHA(
numControllers int, cons constraints.Value, placement []string,
) (params.ControllersChanges, error) {
var results params.ControllersChangeResults
arg := params.ControllersSpecs{
Specs: []params.ControllersSpec{{
NumControllers: numControllers,
Constraints: cons,
Placement: placement,
}}}
err := c.facade.FacadeCall("EnableHA", arg, &results)
if err != nil {
return params.ControllersChanges{}, err
}
if len(results.Results) != 1 {
return params.ControllersChanges{}, errors.Errorf("expected 1 result, got %d", len(results.Results))
}
result := results.Results[0]
if result.Error != nil {
return params.ControllersChanges{}, result.Error
}
return result.Result, nil
}
// MongoUpgradeMode will make all Slave members of the HA
// to shut down their mongo server.
func (c *Client) MongoUpgradeMode(v mongo.Version) (params.MongoUpgradeResults, error) {
arg := params.UpgradeMongoParams{
Target: params.MongoVersion{
Major: v.Major,
Minor: v.Minor,
Patch: v.Patch,
StorageEngine: string(v.StorageEngine),
},
}
results := params.MongoUpgradeResults{}
if err := c.facade.FacadeCall("StopHAReplicationForUpgrade", arg, &results); err != nil {
return results, errors.Annotate(err, "cannnot enter mongo upgrade mode")
}
return results, nil
}
// ResumeHAReplicationAfterUpgrade makes all members part of HA again.
func (c *Client) ResumeHAReplicationAfterUpgrade(members []replicaset.Member) error {
arg := params.ResumeReplicationParams{
Members: members,
}
if err := c.facade.FacadeCall("ResumeHAReplicationAfterUpgrad", arg, nil); err != nil {
return errors.Annotate(err, "cannnot resume ha")
}
return nil
}