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go-micro/service.go
2021-08-31 09:13:35 +01:00

227 lines
4.4 KiB
Go

package micro
import (
"os"
"os/signal"
rtime "runtime"
"strings"
"sync"
"github.com/asim/go-micro/v3/client"
"github.com/asim/go-micro/v3/cmd"
"github.com/asim/go-micro/v3/debug/handler"
"github.com/asim/go-micro/v3/debug/stats"
"github.com/asim/go-micro/v3/debug/trace"
"github.com/asim/go-micro/v3/logger"
plugin "github.com/asim/go-micro/v3/plugins"
"github.com/asim/go-micro/v3/server"
"github.com/asim/go-micro/v3/store"
signalutil "github.com/asim/go-micro/v3/util/signal"
"github.com/asim/go-micro/v3/util/wrapper"
)
type service struct {
opts Options
once sync.Once
}
func newService(opts ...Option) Service {
service := new(service)
options := newOptions(opts...)
// service name
serviceName := options.Server.Options().Name
// wrap client to inject From-Service header on any calls
options.Client = wrapper.FromService(serviceName, options.Client)
options.Client = wrapper.TraceCall(serviceName, trace.DefaultTracer, options.Client)
// wrap the server to provide handler stats
err := options.Server.Init(
server.WrapHandler(wrapper.HandlerStats(stats.DefaultStats)),
server.WrapHandler(wrapper.TraceHandler(trace.DefaultTracer)),
)
if err != nil {
logger.Fatal(err)
}
// set opts
service.opts = options
return service
}
func (s *service) Name() string {
return s.opts.Server.Options().Name
}
// Init initialises options. Additionally it calls cmd.Init
// which parses command line flags. cmd.Init is only called
// on first Init.
func (s *service) Init(opts ...Option) {
// process options
for _, o := range opts {
o(&s.opts)
}
s.once.Do(func() {
// setup the plugins
for _, p := range strings.Split(os.Getenv("MICRO_PLUGIN"), ",") {
if len(p) == 0 {
continue
}
// load the plugin
c, err := plugin.Load(p)
if err != nil {
logger.Fatal(err)
}
// initialise the plugin
if err := plugin.Init(c); err != nil {
logger.Fatal(err)
}
}
// set cmd name
if len(s.opts.Cmd.App().Name) == 0 {
s.opts.Cmd.App().Name = s.Server().Options().Name
}
// Initialise the command flags, overriding new service
if err := s.opts.Cmd.Init(
cmd.Auth(&s.opts.Auth),
cmd.Broker(&s.opts.Broker),
cmd.Registry(&s.opts.Registry),
cmd.Runtime(&s.opts.Runtime),
cmd.Transport(&s.opts.Transport),
cmd.Client(&s.opts.Client),
cmd.Config(&s.opts.Config),
cmd.Server(&s.opts.Server),
cmd.Store(&s.opts.Store),
cmd.Profile(&s.opts.Profile),
); err != nil {
logger.Fatal(err)
}
// Explicitly set the table name to the service name
name := s.opts.Cmd.App().Name
err := s.opts.Store.Init(store.Table(name))
if err != nil {
logger.Fatal(err)
}
})
}
func (s *service) Options() Options {
return s.opts
}
func (s *service) Client() client.Client {
return s.opts.Client
}
func (s *service) Server() server.Server {
return s.opts.Server
}
func (s *service) String() string {
return "micro"
}
func (s *service) Start() error {
for _, fn := range s.opts.BeforeStart {
if err := fn(); err != nil {
return err
}
}
if err := s.opts.Server.Start(); err != nil {
return err
}
for _, fn := range s.opts.AfterStart {
if err := fn(); err != nil {
return err
}
}
return nil
}
func (s *service) Stop() error {
var err error
for _, fn := range s.opts.BeforeStop {
err = fn()
}
if err = s.opts.Server.Stop(); err != nil {
return err
}
for _, fn := range s.opts.AfterStop {
err = fn()
}
return err
}
func (s *service) Run() (err error) {
// exit when help flag is provided
for _, v := range os.Args[1:] {
if v == "-h" || v == "--help" {
os.Exit(0)
}
}
// register the debug handler
s.opts.Server.Handle(
s.opts.Server.NewHandler(
handler.NewHandler(s.opts.Client),
server.InternalHandler(true),
),
)
// start the profiler
if s.opts.Profile != nil {
// to view mutex contention
rtime.SetMutexProfileFraction(5)
// to view blocking profile
rtime.SetBlockProfileRate(1)
if err = s.opts.Profile.Start(); err != nil {
return err
}
defer func() {
err = s.opts.Profile.Stop()
if err != nil {
logger.Error(err)
}
}()
}
if logger.V(logger.InfoLevel, logger.DefaultLogger) {
logger.Infof("Starting [service] %s", s.Name())
}
if err = s.Start(); err != nil {
return err
}
ch := make(chan os.Signal, 1)
if s.opts.Signal {
signal.Notify(ch, signalutil.Shutdown()...)
}
select {
// wait on kill signal
case <-ch:
// wait on context cancel
case <-s.opts.Context.Done():
}
return s.Stop()
}