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app.go
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app.go
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// Copyright 2022 Azugo. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package core
import (
"context"
"fmt"
"os"
"os/signal"
"syscall"
"azugo.io/core/cache"
"azugo.io/core/config"
"azugo.io/core/validation"
"github.com/spf13/cobra"
"go.uber.org/zap"
)
type App struct {
env Environment
// Background context
bgctx context.Context
bgstop context.CancelFunc
// Validate instance
validate *validation.Validate
// Logger
logger *zap.Logger
// Configuration
config *config.Configuration
// Cache
cache *cache.Cache
// App settings
AppVer string
AppBuiltWith string
AppName string
}
func New() *App {
ctx, stop := context.WithCancel(context.Background())
return &App{
env: NewEnvironment(EnvironmentProduction),
bgctx: ctx,
bgstop: stop,
validate: validation.New(),
}
}
// SetVersion sets application version and built with tags
func (a *App) SetVersion(version, builtWith string) {
a.AppVer = version
a.AppBuiltWith = builtWith
}
// Env returns the current application environment
func (a *App) Env() Environment {
return a.env
}
// Validate returns validation service instance.
func (a *App) Validate() *validation.Validate {
return a.validate
}
// BackgroundContext returns global background context
func (a *App) BackgroundContext() context.Context {
return a.bgctx
}
func (a *App) String() string {
name := a.AppName
if len(name) == 0 {
name = "Azugo"
}
bw := a.AppBuiltWith
if len(bw) > 0 {
bw = fmt.Sprintf(" (built with %s)", bw)
}
return fmt.Sprintf("%s %s%s", name, a.AppVer, bw)
}
// SetConfig binds application configuration to the application
func (a *App) SetConfig(cmd *cobra.Command, conf *config.Configuration) {
if a.config != nil && a.config.Ready() {
return
}
a.config = conf
}
// Config returns application configuration.
//
// Panics if configuration is not loaded.
func (a *App) Config() *config.Configuration {
if a.config == nil || !a.config.Ready() {
panic("configuration is not loaded")
}
return a.config
}
// Start web application.
func (a *App) Start() error {
if err := a.initLogger(); err != nil {
return err
}
if err := a.initCache(); err != nil {
return err
}
a.Log().Info(fmt.Sprintf("Starting %s...", a.String()))
return nil
}
// Stop application and its services
func (a *App) Stop() {
a.bgstop()
a.closeCache()
}
// Runnable provides methods to run application that will gracefully stop
type Runnable interface {
Start() error
Log() *zap.Logger
Stop()
}
// Run starts an application and waits for it to finish
func Run(a Runnable) {
// Catch interrupts for gracefully stopping background node proecess
done := make(chan os.Signal, 1)
signal.Notify(done, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
go func() {
if err := a.Start(); err != nil {
a.Log().With(zap.Error(err)).Fatal("failed to start service")
}
}()
<-done
signal.Stop(done)
a.Stop()
}