228 lines
4.7 KiB
Go
228 lines
4.7 KiB
Go
package micro
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import (
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"os"
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"os/signal"
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"runtime"
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"strings"
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"sync"
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"syscall"
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"github.com/micro/go-micro/v2/auth"
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"github.com/micro/go-micro/v2/client"
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"github.com/micro/go-micro/v2/config/cmd"
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"github.com/micro/go-micro/v2/debug/service/handler"
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"github.com/micro/go-micro/v2/debug/stats"
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"github.com/micro/go-micro/v2/debug/trace"
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"github.com/micro/go-micro/v2/logger"
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"github.com/micro/go-micro/v2/plugin"
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"github.com/micro/go-micro/v2/server"
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"github.com/micro/go-micro/v2/store"
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"github.com/micro/go-micro/v2/util/config"
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"github.com/micro/go-micro/v2/util/wrapper"
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)
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type service struct {
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opts Options
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once sync.Once
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}
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func newService(opts ...Option) Service {
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service := new(service)
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options := newOptions(opts...)
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// service name
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serviceName := options.Server.Options().Name
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// TODO: better accessors
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authFn := func() auth.Auth { return service.opts.Auth }
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// wrap client to inject From-Service header on any calls
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options.Client = wrapper.FromService(serviceName, options.Client, authFn)
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options.Client = wrapper.TraceCall(serviceName, trace.DefaultTracer, options.Client)
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// wrap the server to provide handler stats
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options.Server.Init(
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server.WrapHandler(wrapper.HandlerStats(stats.DefaultStats)),
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server.WrapHandler(wrapper.TraceHandler(trace.DefaultTracer)),
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server.WrapHandler(wrapper.AuthHandler(authFn, serviceName)),
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)
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// set opts
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service.opts = options
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return service
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}
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func (s *service) Name() string {
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return s.opts.Server.Options().Name
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}
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// Init initialises options. Additionally it calls cmd.Init
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// which parses command line flags. cmd.Init is only called
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// on first Init.
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func (s *service) Init(opts ...Option) {
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// process options
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for _, o := range opts {
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o(&s.opts)
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}
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s.once.Do(func() {
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// setup the plugins
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for _, p := range strings.Split(os.Getenv("MICRO_PLUGIN"), ",") {
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if len(p) == 0 {
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continue
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}
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// load the plugin
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c, err := plugin.Load(p)
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if err != nil {
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logger.Fatal(err)
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}
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// initialise the plugin
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if err := plugin.Init(c); err != nil {
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logger.Fatal(err)
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}
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}
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// set cmd name
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if len(s.opts.Cmd.App().Name) == 0 {
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s.opts.Cmd.App().Name = s.Server().Options().Name
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}
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// Initialise the command flags, overriding new service
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if err := s.opts.Cmd.Init(
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cmd.Auth(&s.opts.Auth),
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cmd.Broker(&s.opts.Broker),
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cmd.Registry(&s.opts.Registry),
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cmd.Transport(&s.opts.Transport),
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cmd.Client(&s.opts.Client),
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cmd.Config(&s.opts.Config),
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cmd.Server(&s.opts.Server),
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cmd.Profile(&s.opts.Profile),
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); err != nil {
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logger.Fatal(err)
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}
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// If the store has no namespace set, fallback to the
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// services name
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if len(store.DefaultStore.Options().Namespace) == 0 {
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name := s.opts.Cmd.App().Name
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store.DefaultStore.Init(store.Namespace(name))
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}
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// TODO: replace Cmd.Init with config.Load
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// Right now we're just going to load a token
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// May need to re-read value on change
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// TODO: should be scoped to micro/auth/token
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if tk, _ := config.Get("token"); len(tk) > 0 {
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s.opts.Auth.Init(auth.ServiceToken(tk))
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}
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})
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}
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func (s *service) Options() Options {
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return s.opts
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}
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func (s *service) Client() client.Client {
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return s.opts.Client
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}
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func (s *service) Server() server.Server {
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return s.opts.Server
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}
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func (s *service) String() string {
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return "micro"
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}
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func (s *service) Start() error {
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for _, fn := range s.opts.BeforeStart {
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if err := fn(); err != nil {
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return err
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}
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}
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if err := s.opts.Server.Start(); err != nil {
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return err
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}
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for _, fn := range s.opts.AfterStart {
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if err := fn(); err != nil {
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return err
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}
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}
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return nil
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}
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func (s *service) Stop() error {
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var gerr error
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for _, fn := range s.opts.BeforeStop {
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if err := fn(); err != nil {
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gerr = err
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}
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}
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if err := s.opts.Server.Stop(); err != nil {
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return err
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}
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for _, fn := range s.opts.AfterStop {
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if err := fn(); err != nil {
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gerr = err
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}
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}
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return gerr
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}
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func (s *service) Run() error {
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// register the debug handler
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s.opts.Server.Handle(
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s.opts.Server.NewHandler(
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handler.NewHandler(),
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server.InternalHandler(true),
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),
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)
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// start the profiler
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if s.opts.Profile != nil {
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// to view mutex contention
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runtime.SetMutexProfileFraction(5)
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// to view blocking profile
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runtime.SetBlockProfileRate(1)
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if err := s.opts.Profile.Start(); err != nil {
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return err
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}
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defer s.opts.Profile.Stop()
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}
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if logger.V(logger.InfoLevel, logger.DefaultLogger) {
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logger.Infof("Starting [service] %s", s.Name())
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}
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if err := s.Start(); err != nil {
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return err
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}
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ch := make(chan os.Signal, 1)
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if s.opts.Signal {
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signal.Notify(ch, syscall.SIGTERM, syscall.SIGINT, syscall.SIGQUIT)
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}
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select {
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// wait on kill signal
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case <-ch:
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// wait on context cancel
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case <-s.opts.Context.Done():
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}
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return s.Stop()
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}
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