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app.go
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app.go
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package stdserver
import (
"context"
"io"
"os"
"os/signal"
"sync"
"syscall"
"time"
"github.com/gofiber/fiber/v2"
"github.com/rs/zerolog"
)
const (
defaultAppName = "KStdServer"
)
type App struct {
fibre *fiber.App
settings *Settings
rootCtx context.Context
ctx context.Context
cancelCtx context.CancelFunc
logger zerolog.Logger
running bool
lock sync.RWMutex
children []Task
}
func New(settings ...*Settings) *App {
s := &Settings{}
s.Fiber.ETag = false
s.Fiber.Prefork = true
if len(settings) > 0 {
s = settings[0]
}
if len(s.Name) == 0 {
s.Name = defaultAppName
}
if len(s.Fiber.ServerHeader) == 0 {
s.Fiber.ServerHeader = s.Name
}
if s.Fiber.ErrorHandler == nil {
s.Fiber.ErrorHandler = errorHandler
}
if s.Logger == nil {
var w io.Writer = os.Stderr
if s.ColorfulLogging {
w = zerolog.ConsoleWriter{Out: w}
}
l := zerolog.New(w).Level(s.LogLevel)
s.Logger = &l
}
if s.Fiber.IdleTimeout == 0 {
s.Fiber.IdleTimeout = 10 * time.Second
}
if s.Context == nil {
s.Context = context.TODO()
}
app := &App{
fibre: fiber.New(s.Fiber),
settings: s,
logger: s.Logger.With().Str("app", s.Name).Logger(),
rootCtx: s.Context,
}
s.Logger = &app.logger
app.Use(func(c *fiber.Ctx) error {
c.Locals("app", app)
c.Locals("config", app.settings)
return c.Next()
})
app.initMiddlewares()
return app
}
func (app *App) Fiber() *fiber.App {
return app.fibre
}
func (app *App) Log(module string, subModule ...string) *zerolog.Logger {
l := app.logger.With().Str("module", module)
if len(subModule) > 0 {
l = l.Str("subModule", subModule[0])
}
nl := l.Logger()
return &nl
}
func (app *App) Start(addr string) error {
return app.WrapStart(func() error {
return app.fibre.Listen(addr)
})
}
func (app *App) StartTLS(addr, certFile, keyFile string) error {
return app.WrapStart(func() error {
return app.fibre.ListenTLS(addr, certFile, keyFile)
})
}
func (app *App) IsRunning() bool {
app.lock.RLock()
defer app.lock.RUnlock()
return app.running
}
func (app *App) setRunning(state bool) {
app.lock.Lock()
app.running = state
app.lock.Unlock()
}
func (app *App) WrapStart(startFunc func() error) error {
app.lock.Lock()
log := app.Log("core", "main")
sigs := make(chan os.Signal, 1)
done := make(chan bool, 1)
errs := make(chan error, 1)
app.ctx, app.cancelCtx = context.WithCancel(app.rootCtx)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
go func() {
log.Info().Msg("starting server...")
if err := startFunc(); err != nil {
errs <- err
} else {
done <- true
}
app.setRunning(false)
app.cancelCtx()
}()
for _, child := range app.children {
go child(app.ctx)
}
app.running = true
app.lock.Unlock()
select {
case sig := <-sigs:
log.Info().Msgf("signal %s received, shutting down...", sig)
app.cancelCtx()
app.setRunning(false)
if err := app.fibre.Shutdown(); err != nil {
log.Err(err).Msg("while shutting down")
return err
}
log.Info().Msg("server stopped gracefully")
case <-done:
app.cancelCtx()
app.setRunning(false)
log.Info().Msg("server stopped gracefully")
case err := <-errs:
app.cancelCtx()
log.Err(err).Msg("while running")
app.setRunning(false)
return err
}
log.Info().Msg("goodbye!")
return nil
}
func (app *App) Router(prefix string, handlers ...fiber.Handler) fiber.Router {
return app.fibre.Group(prefix, handlers...)
}