/
app.go
97 lines (86 loc) · 1.72 KB
/
app.go
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package app
import (
"context"
"errors"
"os"
"os/signal"
"syscall"
"github.com/google/uuid"
"golang.org/x/sync/errgroup"
"github.com/FirYuen/scaffold/pkg/conf"
"github.com/FirYuen/scaffold/pkg/log"
)
type App struct {
c *conf.Config
opts options
ctx context.Context
cancel func()
log log.Logger
}
func New(c *conf.Config, opts ...Option) *App {
options := options{
ctx: context.Background(),
logger: log.GetLogger(),
// don not catch SIGKILL signal, need to waiting for kill self by other.
sigs: []os.Signal{syscall.SIGTERM, syscall.SIGQUIT, syscall.SIGINT},
}
if id, err := uuid.NewUUID(); err == nil {
options.id = id.String()
}
for _, o := range opts {
o(&options)
}
ctx, cancel := context.WithCancel(options.ctx)
return &App{
c: c,
opts: options,
ctx: ctx,
log: log.GetLogger(),
cancel: cancel,
}
}
// Run start app
func (a *App) Run() error {
a.log.Infof("app_id: %s, app_name: %s, version: %s",
a.opts.id,
a.opts.name,
a.opts.version,
)
g, ctx := errgroup.WithContext(a.ctx)
// start server
for _, srv := range a.opts.servers {
srv := srv
g.Go(func() error {
<-ctx.Done()
return srv.Stop()
})
g.Go(func() error {
return srv.Start()
})
}
// watch signal
quit := make(chan os.Signal, 1)
signal.Notify(quit, a.opts.sigs...)
g.Go(func() error {
for {
select {
case <-ctx.Done():
return ctx.Err()
case s := <-quit:
a.log.Infof("receive a quit signal: %s", s.String())
return a.Stop()
}
}
})
if err := g.Wait(); err != nil && !errors.Is(err, context.Canceled) {
return err
}
return nil
}
// Stop stops the application gracefully.
func (a *App) Stop() error {
if a.cancel != nil {
a.cancel()
}
return nil
}