| package main |
| |
| import ( |
| "fmt" |
| "os" |
| "os/signal" |
| "time" |
| "errors" |
| "strconv" |
| "github.com/opencord/voltha-go/db/kvstore" |
| "github.com/opencord/voltha-go/common/log" |
| "github.com/opencord/voltha-go/rw_core/config" |
| "syscall" |
| ) |
| |
| type rwCore struct { |
| kvClient kvstore.Client |
| config *config.RWCoreFlags |
| halted bool |
| exitChannel chan int |
| } |
| |
| func newKVClient(storeType string, address string, timeout int) (kvstore.Client, error) { |
| |
| log.Infow("kv-store-type", log.Fields{"store":storeType}) |
| switch storeType { |
| case "consul": |
| return kvstore.NewConsulClient(address, timeout) |
| case "etcd": |
| return kvstore.NewEtcdClient(address, timeout) |
| } |
| return nil, errors.New("unsupported-kv-store") |
| } |
| |
| func newRWCore(cf *config.RWCoreFlags) *rwCore { |
| var rwCore rwCore |
| rwCore.config = cf |
| rwCore.halted = false |
| rwCore.exitChannel = make(chan int, 1) |
| return &rwCore |
| } |
| |
| func (core *rwCore) setKVClient() error { |
| addr := core.config.KVStoreHost + ":" + strconv.Itoa(core.config.KVStorePort) |
| client, err := newKVClient(core.config.KVStoreType, addr, core.config.KVStoreTimeout) |
| if err != nil { |
| log.Error(err) |
| return err |
| } |
| core.kvClient = client |
| return nil |
| } |
| |
| |
| func toString(value interface{}) (string, error) { |
| switch t := value.(type) { |
| case []byte: |
| return string(value.([]byte)), nil |
| case string: |
| return value.(string), nil |
| default: |
| return "", fmt.Errorf("unexpected-type-%T", t) |
| } |
| } |
| |
| |
| func (core *rwCore) start() { |
| log.Info("core-starting") |
| |
| //First set the KV client. Some client immediately tries to connect to the KV store (etcd) while others does |
| // not create the connection until a request to the store is made (consul) |
| tick := time.Tick(kvstore.GetDuration(core.config.KVStoreTimeout)) |
| connected := false |
| KVStoreConnectLoop: |
| for { |
| if err := core.setKVClient(); err != nil { |
| log.Warn("cannot-create-kv-client-retrying") |
| select { |
| case <-tick: |
| log.Debug("kv-client-retry") |
| continue |
| case <-core.exitChannel: |
| log.Info("exit-request-received") |
| break KVStoreConnectLoop |
| } |
| } else { |
| log.Debug("got-kv-client.") |
| connected = true |
| break |
| } |
| } |
| // Connected is true only if there is a valid KV store connection and no exit request has been received |
| if connected { |
| log.Info("core-started") |
| } else { |
| log.Info("core-ended") |
| } |
| } |
| |
| |
| func (core *rwCore) stop() { |
| // Stop leadership tracking |
| core.halted = true |
| |
| // send exit signal |
| core.exitChannel <- 0 |
| |
| // Cleanup - applies only if we had a kvClient |
| if core.kvClient != nil { |
| // Release all reservations |
| if err := core.kvClient.ReleaseAllReservations(); err != nil { |
| log.Infow("fail-to-release-all-reservations", log.Fields{"error":err}) |
| } |
| // Close the DB connection |
| core.kvClient.Close() |
| } |
| } |
| |
| func waitForExit() int { |
| signalChannel := make(chan os.Signal, 1) |
| signal.Notify(signalChannel, |
| syscall.SIGHUP, |
| syscall.SIGINT, |
| syscall.SIGTERM, |
| syscall.SIGQUIT) |
| |
| exitChannel := make(chan int) |
| |
| go func() { |
| s := <-signalChannel |
| switch s { |
| case syscall.SIGHUP, |
| syscall.SIGINT, |
| syscall.SIGTERM, |
| syscall.SIGQUIT: |
| log.Infow("closing-signal-received", log.Fields{"signal":s}) |
| exitChannel <- 0 |
| default: |
| log.Infow("unexpected-signal-received", log.Fields{"signal":s}) |
| exitChannel <- 1 |
| } |
| }() |
| |
| code := <-exitChannel |
| return code |
| } |
| |
| func main() { |
| start := time.Now() |
| |
| cf := config.NewRWCoreFlags() |
| cf.ParseCommandArguments() |
| |
| // Setup logging |
| if _, err := log.SetLogger(log.JSON, log.DebugLevel, log.Fields{"instanceId":cf.InstanceID}); err != nil { |
| log.With(log.Fields{"error": err}).Fatal("Cannot setup logging") |
| } |
| defer log.CleanUp() |
| |
| log.Infow("rw-core-config", log.Fields{"config":*cf}) |
| |
| core := newRWCore(cf) |
| go core.start() |
| |
| code := waitForExit() |
| log.Infow("received-a-closing-signal", log.Fields{"code":code}) |
| |
| // Cleanup before leaving |
| core.stop() |
| |
| elapsed := time.Since(start) |
| log.Infow("rw-core-run-time", log.Fields{"core":core.config.InstanceID, "time":elapsed/time.Second}) |
| } |