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daemon.go
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daemon.go
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// Copyright 2020 Northern.tech AS
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package app
import (
"github.com/mendersoftware/mender/datastore"
"github.com/mendersoftware/mender/store"
"github.com/mendersoftware/mender/system"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
)
// Config section
type MenderDaemon struct {
Mender Controller
Sctx StateContext
Store store.Store
ForceToState chan State
stop bool
}
func NewDaemon(mender Controller, store store.Store) *MenderDaemon {
daemon := MenderDaemon{
Mender: mender,
Sctx: StateContext{
Store: store,
Rebooter: system.NewSystemRebootCmd(system.OsCalls{}),
WakeupChan: make(chan bool, 1),
},
Store: store,
ForceToState: make(chan State, 1),
}
return &daemon
}
func (d *MenderDaemon) StopDaemon() {
d.stop = true
}
func (d *MenderDaemon) Cleanup() {
if d.Store != nil {
if err := d.Store.Close(); err != nil {
log.Errorf("Failed to close data store: %v", err)
}
d.Store = nil
}
}
func (d *MenderDaemon) shouldStop() bool {
return d.stop
}
func (d *MenderDaemon) Run() error {
// set the first state transition
var toState State = d.Mender.GetCurrentState()
cancelled := false
for {
// If signal SIGUSR1 or SIGUSR2 is received, force the state-machine to the correct state.
select {
case nState := <-d.ForceToState:
switch toState.(type) {
case *idleState,
*checkWaitState,
*updateCheckState,
*inventoryUpdateState:
log.Infof("Forcing state machine to: %s", nState)
toState = nState
default:
log.Errorf("Cannot check update or update inventory while in %s state", toState)
}
default:
// Identity op - do nothing.
}
toState, cancelled = d.Mender.TransitionState(toState, &d.Sctx)
if toState.Id() == datastore.MenderStateError {
es, ok := toState.(*errorState)
if ok {
if es.IsFatal() {
return es.cause
}
} else {
return errors.New("failed")
}
}
if cancelled || toState.Id() == datastore.MenderStateDone {
break
}
if d.shouldStop() {
return nil
}
}
return nil
}