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localController.go
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localController.go
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/*
* Copyright 2020 Google LLC
*
* 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
*
* https://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 probe
import (
"sync"
"github.com/FirebaseExtended/fcm-external-prober/Controller/src/controller"
"github.com/FirebaseExtended/fcm-external-prober/Probe/src/utils"
)
var (
probeConfigs *controller.ProbeConfigs
maker utils.CommandMaker
clock utils.Timer
logger Logger
fcmAuth Auth
deviceToken string
probing = true
probeLock sync.Mutex
)
// Handles startup/teardown of emulator/app, also starts and stops probing
func Control(mk utils.CommandMaker, clk utils.Timer, lg Logger) {
maker = mk
clock = clk
logger = lg
acquireData()
err := initClient()
if err != nil {
logger.LogFatalf("Control: unable to initialize gRPC client: %v", err)
}
defer destroyEnvironment()
initEnvironment()
tok, err := getToken()
if err != nil {
logger.LogFatalf("Control: could not acquire device token: %v", err)
}
deviceToken = tok
ps := makeProbes()
rwg, err := startResolver()
if err != nil {
logger.LogFatalf("Control: unable to start resolver: %v", err)
}
pwg := startProbes(ps)
err = communicate()
if err != nil {
logger.LogErrorf("Control: communication error, %v", err)
}
stopProbes(pwg)
stopResolver(rwg)
err = confirmStop()
// Connection was lost to the controller, so assume it has terminated and delete VM instance
if err != nil {
deleteVM()
}
}
func acquireData() {
// Set hostname first so that errors are identifiable by VM if they occur
var err error
hostname, err = getHostname()
if err != nil {
logger.LogFatalf("acquireData: unable to resolve hostname: %v", err)
}
// Update region in logger now that it has been acquired
logger.SetRegion(hostname)
// Get Metadata that will be used to connect to the controller
err = getMetadata()
if err != nil {
logger.LogFatalf("acquireData: unable to acquire metadata: %v", err)
}
// Update logger send destinations that were acquired with metadata
logger.SetError(metadata.GetErrorLogDestination())
logger.SetLog(metadata.GetProbeLogDestination())
}
func initEnvironment() {
err := startEmulator()
if err != nil {
logger.LogFatalf("initEnvironment: could not start emulator: %v", err)
}
err = startApp()
if err != nil {
logger.LogFatalf("initEnvironment: could not install app: %v", err)
}
}
func destroyEnvironment() {
err := uninstallApp()
if err != nil {
logger.LogErrorf("destroyEnvironment: unable to uninstall app: %v", err)
}
err = killEmulator()
if err != nil {
logger.LogFatalf("destroyEnvironment: could not kill emulator: %v", err)
}
}
func makeProbes() []*probe {
var ret []*probe
for _, p := range probeConfigs.GetProbe() {
ret = append(ret, newProbe(p))
}
return ret
}
func startProbes(ps []*probe) *sync.WaitGroup {
pwg := new(sync.WaitGroup)
for _, p := range ps {
pwg.Add(1)
go p.probe(pwg)
}
return pwg
}
func stopProbes(pwg *sync.WaitGroup) {
probeLock.Lock()
probing = false
probeLock.Unlock()
pwg.Wait()
}
func startResolver() (*sync.WaitGroup, error) {
rwg := new(sync.WaitGroup)
rwg.Add(1)
err := initResolver()
if err != nil {
return nil, err
}
go resolveProbes(rwg)
return rwg, nil
}
func stopResolver(rwg *sync.WaitGroup) {
closeUnresolved()
rwg.Wait()
}
func deleteVM() {
maker.Command("gcloud", "compute", "instances", "delete", hostname, "--zone", hostname, "--quiet")
}