forked from juju/juju
/
migrationtarget.go
284 lines (257 loc) · 8.86 KB
/
migrationtarget.go
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// Copyright 2016 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package migrationtarget
import (
"time"
"github.com/juju/errors"
"gopkg.in/juju/names.v2"
"github.com/juju/juju/apiserver/common"
"github.com/juju/juju/apiserver/common/credentialcommon"
"github.com/juju/juju/apiserver/facade"
"github.com/juju/juju/apiserver/params"
"github.com/juju/juju/caas"
coremigration "github.com/juju/juju/core/migration"
"github.com/juju/juju/core/status"
"github.com/juju/juju/environs"
"github.com/juju/juju/environs/context"
"github.com/juju/juju/migration"
"github.com/juju/juju/permission"
"github.com/juju/juju/state"
"github.com/juju/juju/state/stateenvirons"
)
// API implements the API required for the model migration
// master worker when communicating with the target controller.
type API struct {
state *state.State
pool *state.StatePool
authorizer facade.Authorizer
resources facade.Resources
presence facade.Presence
getClaimer migration.ClaimerFunc
getEnviron stateenvirons.NewEnvironFunc
getCAASBroker stateenvirons.NewCAASBrokerFunc
callContext context.ProviderCallContext
}
// NewFacade is used for API registration.
func NewFacade(ctx facade.Context) (*API, error) {
return NewAPI(
ctx,
stateenvirons.GetNewEnvironFunc(environs.New),
stateenvirons.GetNewCAASBrokerFunc(caas.New),
state.CallContext(ctx.State()))
}
// NewAPI returns a new API. Accepts a NewEnvironFunc and context.ProviderCallContext
// for testing purposes.
func NewAPI(ctx facade.Context, getEnviron stateenvirons.NewEnvironFunc, getCAASBroker stateenvirons.NewCAASBrokerFunc, callCtx context.ProviderCallContext) (*API, error) {
auth := ctx.Auth()
st := ctx.State()
if err := checkAuth(auth, st); err != nil {
return nil, errors.Trace(err)
}
return &API{
state: st,
pool: ctx.StatePool(),
authorizer: auth,
resources: ctx.Resources(),
presence: ctx.Presence(),
getClaimer: ctx.LeadershipClaimer,
getEnviron: getEnviron,
getCAASBroker: getCAASBroker,
callContext: callCtx,
}, nil
}
func checkAuth(authorizer facade.Authorizer, st *state.State) error {
if !authorizer.AuthClient() {
return errors.Trace(common.ErrPerm)
}
if isAdmin, err := authorizer.HasPermission(permission.SuperuserAccess, st.ControllerTag()); err != nil {
return errors.Trace(err)
} else if !isAdmin {
// The entire facade is only accessible to controller administrators.
return errors.Trace(common.ErrPerm)
}
return nil
}
// Prechecks ensure that the target controller is ready to accept a
// model migration.
func (api *API) Prechecks(model params.MigrationModelInfo) error {
ownerTag, err := names.ParseUserTag(model.OwnerTag)
if err != nil {
return errors.Trace(err)
}
controllerState := api.pool.SystemState()
// NOTE (thumper): it isn't clear to me why api.state would be different
// from the controllerState as I had thought that the Precheck call was
// on the controller model, in which case it should be the same as the
// controllerState.
backend, err := migration.PrecheckShim(api.state, controllerState)
if err != nil {
return errors.Annotate(err, "creating backend")
}
return migration.TargetPrecheck(
backend,
migration.PoolShim(api.pool),
coremigration.ModelInfo{
UUID: model.UUID,
Name: model.Name,
Owner: ownerTag,
AgentVersion: model.AgentVersion,
ControllerAgentVersion: model.ControllerAgentVersion,
},
api.presence.ModelPresence(controllerState.ModelUUID()),
)
}
// Import takes a serialized Juju model, deserializes it, and
// recreates it in the receiving controller.
func (api *API) Import(serialized params.SerializedModel) error {
controller := state.NewController(api.pool)
_, st, err := migration.ImportModel(controller, api.getClaimer, serialized.Bytes)
if err != nil {
return err
}
defer st.Close()
// TODO(mjs) - post import checks
// NOTE(fwereade) - checks here would be sensible, but we will
// also need to check after the binaries are imported too.
return err
}
func (api *API) getModel(modelTag string) (*state.Model, func(), error) {
tag, err := names.ParseModelTag(modelTag)
if err != nil {
return nil, nil, errors.Trace(err)
}
model, ph, err := api.pool.GetModel(tag.Id())
if err != nil {
return nil, nil, errors.Trace(err)
}
return model, func() { ph.Release() }, nil
}
func (api *API) getImportingModel(args params.ModelArgs) (*state.Model, func(), error) {
model, release, err := api.getModel(args.ModelTag)
if err != nil {
return nil, nil, errors.Trace(err)
}
if model.MigrationMode() != state.MigrationModeImporting {
release()
return nil, nil, errors.New("migration mode for the model is not importing")
}
return model, release, nil
}
// Abort removes the specified model from the database. It is an error to
// attempt to Abort a model that has a migration mode other than importing.
func (api *API) Abort(args params.ModelArgs) error {
model, releaseModel, err := api.getImportingModel(args)
if err != nil {
return errors.Trace(err)
}
defer releaseModel()
st, err := api.pool.Get(model.UUID())
if err != nil {
return errors.Trace(err)
}
defer st.Release()
return st.RemoveImportingModelDocs()
}
// Activate sets the migration mode of the model to "none", meaning it
// is ready for use. It is an error to attempt to Abort a model that
// has a migration mode other than importing.
func (api *API) Activate(args params.ModelArgs) error {
model, release, err := api.getImportingModel(args)
if err != nil {
return errors.Trace(err)
}
defer release()
if err := model.SetStatus(status.StatusInfo{Status: status.Available}); err != nil {
return errors.Trace(err)
}
// TODO(fwereade) - need to validate binaries here.
return model.SetMigrationMode(state.MigrationModeNone)
}
// LatestLogTime returns the time of the most recent log record
// received by the logtransfer endpoint. This can be used as the start
// point for streaming logs from the source if the transfer was
// interrupted.
//
// For performance reasons, not every time is tracked, so if the
// target controller died during the transfer the latest log time
// might be up to 2 minutes earlier. If the transfer was interrupted
// in some other way (like the source controller going away or a
// network partition) the time will be up-to-date.
//
// Log messages are assumed to be sent in time order (which is how
// debug-log emits them). If that isn't the case then this mechanism
// can't be used to avoid duplicates when logtransfer is restarted.
//
// Returns the zero time if no logs have been transferred.
func (api *API) LatestLogTime(args params.ModelArgs) (time.Time, error) {
model, release, err := api.getModel(args.ModelTag)
if err != nil {
return time.Time{}, errors.Trace(err)
}
defer release()
tracker := state.NewLastSentLogTracker(api.state, model.UUID(), "migration-logtransfer")
defer tracker.Close()
_, timestamp, err := tracker.Get()
if errors.Cause(err) == state.ErrNeverForwarded {
return time.Time{}, nil
}
if err != nil {
return time.Time{}, errors.Trace(err)
}
return time.Unix(0, timestamp).In(time.UTC), nil
}
// AdoptResources asks the cloud provider to update the controller
// tags for a model's resources. This prevents the resources from
// being destroyed if the source controller is destroyed after the
// model is migrated away.
func (api *API) AdoptResources(args params.AdoptResourcesArgs) error {
tag, err := names.ParseModelTag(args.ModelTag)
if err != nil {
return errors.Trace(err)
}
st, err := api.pool.Get(tag.Id())
if err != nil {
return errors.Trace(err)
}
defer st.Release()
m, err := st.Model()
if err != nil {
return errors.Trace(err)
}
var ra environs.ResourceAdopter
if m.Type() == state.ModelTypeCAAS {
ra, err = api.getCAASBroker(st.State)
} else {
ra, err = api.getEnviron(st.State)
}
if err != nil {
return errors.Trace(err)
}
return errors.Trace(ra.AdoptResources(api.callContext, st.ControllerUUID(), args.SourceControllerVersion))
}
// CheckMachines compares the machines in state with the ones reported
// by the provider and reports any discrepancies.
func (api *API) CheckMachines(args params.ModelArgs) (params.ErrorResults, error) {
tag, err := names.ParseModelTag(args.ModelTag)
if err != nil {
return params.ErrorResults{}, errors.Trace(err)
}
st, err := api.pool.Get(tag.Id())
if err != nil {
return params.ErrorResults{}, errors.Trace(err)
}
defer st.Release()
return credentialcommon.ValidateExistingModelCredential(
credentialcommon.NewPersistentBackend(st.State),
api.callContext,
)
}
// CACert returns the certificate used to validate the state connection.
func (api *API) CACert() (params.BytesResult, error) {
cfg, err := api.state.ControllerConfig()
if err != nil {
return params.BytesResult{}, errors.Trace(err)
}
caCert, _ := cfg.CACert()
return params.BytesResult{Result: []byte(caCert)}, nil
}