/
service.go
321 lines (291 loc) · 7.1 KB
/
service.go
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package pluto
import (
"context"
"errors"
"fmt"
"os"
"os/signal"
"sync"
"syscall"
"time"
"github.com/aukbit/fibonacci"
"github.com/aukbit/pluto/client"
"github.com/aukbit/pluto/common"
"github.com/aukbit/pluto/server"
"github.com/aukbit/pluto/server/router"
"github.com/rs/zerolog"
"google.golang.org/grpc/health"
healthpb "google.golang.org/grpc/health/grpc_health_v1"
)
const (
defaultName = "pluto"
defaultHealthAddr = ":9090"
)
var (
ErrDatastoreNotInitialized = errors.New("datastore not initialized")
)
// Service representacion of a pluto service
type Service struct {
close chan bool
cfg Config
wg *sync.WaitGroup
health *health.Server
logger zerolog.Logger
}
func init() {
zerolog.TimestampFieldName = "timestamp"
zerolog.TimeFieldFormat = time.RFC3339Nano
zerolog.LevelFieldName = "severity"
zerolog.MessageFieldName = "message"
switch os.Getenv("LOGGER_LEVEL") {
case "debug":
zerolog.SetGlobalLevel(zerolog.DebugLevel)
default:
zerolog.SetGlobalLevel(zerolog.InfoLevel)
}
}
// New returns a new pluto service with Options passed in
func New(opts ...Option) *Service {
return newService(opts...)
}
func newService(opts ...Option) *Service {
s := &Service{
cfg: newConfig(),
close: make(chan bool),
wg: &sync.WaitGroup{},
health: health.NewServer(),
}
s.logger = zerolog.New(os.Stderr).With().Timestamp().Logger()
if len(opts) > 0 {
s = s.WithOptions(opts...)
}
return s
}
// WithOptions clones the current Service, applies the supplied Options, and
// returns the resulting Service. It's safe to use concurrently.
func (s *Service) WithOptions(opts ...Option) *Service {
for _, opt := range opts {
opt.apply(s)
}
return s
}
// Run starts service
func (s *Service) Run() error {
s.logger = s.logger.With().Str("id", s.cfg.ID).Str("name", s.cfg.Name).Logger()
// set health server
s.setHealthServer()
// start service
if err := s.start(); err != nil {
return err
}
// hook run after start
if err := s.hookAfterStart(); err != nil {
return err
}
// wait for all go routines to finish
s.wg.Wait()
s.logger.Warn().Msg(fmt.Sprintf("%s has just exited", s.Name()))
return nil
}
// Stop stops service
func (s *Service) Stop() {
s.logger.Info().Msg(fmt.Sprintf("shutting down %s", s.Name()))
s.close <- true
}
// Push allows to start additional options while service is running
func (s *Service) Push(opts ...Option) {
for _, opt := range opts {
opt.apply(s)
}
}
// Server returns a server instance by name if initialized in service
func (s *Service) Server(name string) (srv *server.Server, ok bool) {
name = common.SafeName(name, server.DefaultName)
if srv, ok = s.cfg.Servers[name]; !ok {
return
}
return srv, true
}
// Client returns a client instance by name if initialized in service
func (s *Service) Client(name string) (clt *client.Client, ok bool) {
name = common.SafeName(name, client.DefaultName)
if clt, ok = s.cfg.Clients[name]; !ok {
return
}
return clt, true
}
// Health ...
func (s *Service) Health() *healthpb.HealthCheckResponse {
hcr, err := s.health.Check(
context.Background(), &healthpb.HealthCheckRequest{Service: s.cfg.ID})
if err != nil {
s.logger.Error().Msg(err.Error())
}
return hcr
}
// ID returns service id
func (s *Service) ID() string {
return s.cfg.ID
}
// Name returns service name
func (s *Service) Name() string {
return s.cfg.Name
}
// Logger returns service logger
func (s *Service) Logger() zerolog.Logger {
return s.logger
}
// WaitUntilFinish returns service name
func (s *Service) WaitUntilFinish() {
<-s.close
}
func (s *Service) setHealthServer() {
s.health.SetServingStatus(s.cfg.ID, 1)
// Define Router
mux := router.New()
mux.GET("/_health/:module/:name", healthHandler)
// Define server
srv := server.New(
server.Name(s.cfg.Name+"_health"),
server.Addr(s.cfg.HealthAddr),
server.Mux(mux),
// server.Logger(s.logger),
)
s.cfg.Servers[srv.Name()] = srv
}
func (s *Service) start() error {
s.logger.Info().Str("ip4", common.IPaddress()).
Int("servers", len(s.cfg.Servers)).
Int("clients", len(s.cfg.Clients)).
Msg(fmt.Sprintf("starting %s, servers: %d clients: %d", s.Name(), len(s.cfg.Servers), len(s.cfg.Clients)))
// run servers
s.startServers()
// dial clients
s.startClients()
// add go routine to WaitGroup
s.wg.Add(1)
go s.waitUntilStopOrSig()
return nil
}
func (s *Service) hookAfterStart() error {
hooks, ok := s.cfg.Hooks["after_start"]
if !ok {
return nil
}
ctx := context.Background()
// make service available in hooks context
ctx = s.WithContext(ctx)
// make logger available in hooks context
sublogger := s.logger.With().Str("hook", "after_start").Logger()
ctx = sublogger.WithContext(ctx)
for _, h := range hooks {
if err := h(ctx); err != nil {
return err
}
}
return nil
}
func (s *Service) startServers() {
for _, srv := range s.cfg.Servers {
// add go routine to WaitGroup
s.wg.Add(1)
go func(s *Service, srv *server.Server) {
defer s.wg.Done()
f := fibonacci.F()
for {
err := srv.Run(
server.Middlewares(
serviceContextMiddleware(s),
),
server.UnaryServerInterceptors(
serviceContextUnaryServerInterceptor(s),
),
server.StreamServerInterceptors(
serviceContextStreamServerInterceptore(s),
),
server.Logger(s.logger),
)
if err == nil {
return
}
l := srv.Logger()
l.Error().Msg(fmt.Sprintf("%v failed to start, error: %v", srv.Name(), err.Error()))
time.Sleep(time.Duration(f()) * time.Second)
}
}(s, srv)
}
}
// startClients listen to the clientsCh
func (s *Service) startClients() {
go func() {
for {
select {
case clt, ok := <-s.cfg.clientsCh:
if !ok {
break
}
s.startClient(clt)
default:
time.Sleep(500 * time.Millisecond)
continue
}
}
}()
}
func (s *Service) startClient(clt *client.Client) {
go func(clt *client.Client) {
clt.Init(client.Logger(s.logger))
}(clt)
}
// waitUntilStopOrSig waits for close channel or syscall Signal
func (s *Service) waitUntilStopOrSig() {
defer s.wg.Done()
// Stop also in case of any host signal
sigch := make(chan os.Signal, 1)
signal.Notify(sigch, syscall.SIGTERM, syscall.SIGINT)
outer:
for {
select {
case <-s.close:
// Waits for call to stop
s.health.SetServingStatus(s.cfg.ID, 2)
s.unregister()
s.closeClients()
s.stopServers()
break outer
case sig := <-sigch:
// Waits for signal to stop
s.logger.Info().Msg(fmt.Sprintf("shutting down, got signal: %v", sig))
s.health.SetServingStatus(s.cfg.ID, 2)
s.unregister()
s.closeClients()
s.stopServers()
break outer
default:
// keep on looping, non-blocking channel operations
time.Sleep(50 * time.Millisecond)
continue
}
}
}
func (s *Service) closeClients() {
close(s.cfg.clientsCh)
// for _, clt := range s.cfg.Clients {
// // add go routine to WaitGroup
// s.wg.Add(1)
// go func(clt *client.Client) {
// defer s.wg.Done()
// clt.Close()
// }(clt)
// }
}
func (s *Service) stopServers() {
for _, srv := range s.cfg.Servers {
// add go routine to WaitGroup
s.wg.Add(1)
go func(s *Service, srv *server.Server) {
defer s.wg.Done()
srv.Stop()
}(s, srv)
}
}