micro/service.go

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package micro
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import (
"os"
"os/signal"
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"runtime"
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"strings"
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"sync"
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"syscall"
"github.com/micro/go-micro/client"
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"github.com/micro/go-micro/config/cmd"
"github.com/micro/go-micro/debug/profile"
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"github.com/micro/go-micro/debug/profile/http"
"github.com/micro/go-micro/debug/profile/pprof"
"github.com/micro/go-micro/debug/service/handler"
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"github.com/micro/go-micro/debug/stats"
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"github.com/micro/go-micro/plugin"
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"github.com/micro/go-micro/server"
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"github.com/micro/go-micro/util/log"
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"github.com/micro/go-micro/util/wrapper"
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)
type service struct {
opts Options
once sync.Once
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}
func newService(opts ...Option) 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)
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options.Client = wrapper.TraceCall(serviceName, options.Server.Options().Tracer, options.Client)
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// wrap the server to provide handler stats
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options.Server.Init(
server.WrapHandler(wrapper.HandlerStats(stats.DefaultStats)),
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server.WrapHandler(wrapper.TraceHandler(options.Server.Options().Tracer)),
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)
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return &service{
opts: options,
}
}
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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.
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func (s *service) Init(opts ...Option) {
// process options
for _, o := range opts {
o(&s.opts)
}
s.once.Do(func() {
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// 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 {
log.Fatal(err)
}
// initialise the plugin
if err := plugin.Init(c); err != nil {
log.Fatal(err)
}
}
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// 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
_ = s.opts.Cmd.Init(
cmd.Broker(&s.opts.Broker),
cmd.Registry(&s.opts.Registry),
cmd.Transport(&s.opts.Transport),
cmd.Client(&s.opts.Client),
cmd.Server(&s.opts.Server),
)
})
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}
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func (s *service) Options() Options {
return s.opts
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}
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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 {
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return "micro"
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}
func (s *service) Start() error {
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for _, fn := range s.opts.BeforeStart {
if err := fn(); err != nil {
return err
}
}
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if err := s.opts.Server.Start(); err != nil {
return err
}
for _, fn := range s.opts.AfterStart {
if err := fn(); err != nil {
return err
}
}
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return nil
}
func (s *service) Stop() error {
var gerr error
for _, fn := range s.opts.BeforeStop {
if err := fn(); err != nil {
gerr = err
}
}
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if err := s.opts.Server.Stop(); err != nil {
return err
}
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for _, fn := range s.opts.AfterStop {
if err := fn(); err != nil {
gerr = err
}
}
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return gerr
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}
func (s *service) Run() error {
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// register the debug handler
s.opts.Server.Handle(
s.opts.Server.NewHandler(
handler.NewHandler(s.Options().Server),
server.InternalHandler(true),
),
)
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// start the profiler
// TODO: set as an option to the service, don't just use pprof
if prof := os.Getenv("MICRO_DEBUG_PROFILE"); len(prof) > 0 {
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var profiler profile.Profile
// to view mutex contention
runtime.SetMutexProfileFraction(5)
// to view blocking profile
runtime.SetBlockProfileRate(1)
switch prof {
case "http":
profiler = http.NewProfile()
default:
service := s.opts.Server.Options().Name
version := s.opts.Server.Options().Version
id := s.opts.Server.Options().Id
profiler = pprof.NewProfile(
profile.Name(service + "." + version + "." + id),
)
}
if err := profiler.Start(); err != nil {
return err
}
defer profiler.Stop()
}
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log.Logf("Starting [service] %s", s.Name())
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if err := s.Start(); err != nil {
return err
}
ch := make(chan os.Signal, 1)
if s.opts.Signal {
signal.Notify(ch, syscall.SIGTERM, syscall.SIGINT, syscall.SIGQUIT)
}
select {
// wait on kill signal
case <-ch:
// wait on context cancel
case <-s.opts.Context.Done():
}
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return s.Stop()
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}