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kocha.go
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kocha.go
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package kocha
import (
"bytes"
"fmt"
"net/http"
"os"
"reflect"
"runtime"
"sync"
"github.com/joho/godotenv"
"github.com/naoina/kocha/log"
"github.com/naoina/miyabi"
)
const (
// DefaultHttpAddr is the default listen address.
DefaultHttpAddr = "127.0.0.1:9100"
// DefaultMaxClientBodySize is the maximum size of HTTP request body.
// This can be overridden by setting Config.MaxClientBodySize.
DefaultMaxClientBodySize = 1024 * 1024 * 10 // 10MB
// StaticDir is the directory of the static files.
StaticDir = "public"
)
var (
nullMiddlewareNext = func() error {
return nil
}
bufPool = &sync.Pool{
New: func() interface{} {
return new(bytes.Buffer)
},
}
)
// Run starts Kocha app.
// This will launch the HTTP server by using github.com/naoina/miyabi.
// If you want to use other HTTP server that compatible with net/http such as
// http.ListenAndServe, you can use New.
func Run(config *Config) error {
app, err := New(config)
if err != nil {
return err
}
pid := os.Getpid()
miyabi.ServerState = func(state miyabi.State) {
switch state {
case miyabi.StateStart:
fmt.Printf("Listening on %s\n", app.Config.Addr)
fmt.Printf("Server PID: %d\n", pid)
case miyabi.StateRestart:
app.Logger.Warn("kocha: graceful restarted")
case miyabi.StateShutdown:
app.Logger.Warn("kocha: graceful shutdown")
}
}
server := &miyabi.Server{
Addr: config.Addr,
Handler: app,
}
app.Event.start()
defer app.Event.stop()
return server.ListenAndServe()
}
// Application represents a Kocha app.
// This implements the http.Handler interface.
type Application struct {
// Config is a configuration of an application.
Config *Config
// Router is an HTTP request router of an application.
Router *Router
// Template is template sets of an application.
Template *Template
// Logger is an application logger.
Logger log.Logger
// Event is an interface of the event system.
Event *Event
// ResourceSet is set of resource of an application.
ResourceSet ResourceSet
failedUnits map[string]struct{}
mu sync.RWMutex
}
// New returns a new Application that configured by config.
func New(config *Config) (*Application, error) {
app := &Application{
Config: config,
failedUnits: make(map[string]struct{}),
}
if app.Config.Addr == "" {
config.Addr = DefaultHttpAddr
}
if app.Config.MaxClientBodySize < 1 {
config.MaxClientBodySize = DefaultMaxClientBodySize
}
if err := app.validateMiddlewares(); err != nil {
return nil, err
}
if err := app.buildResourceSet(); err != nil {
return nil, err
}
if err := app.buildTemplate(); err != nil {
return nil, err
}
if err := app.buildRouter(); err != nil {
return nil, err
}
if err := app.buildLogger(); err != nil {
return nil, err
}
if err := app.buildEvent(); err != nil {
return nil, err
}
return app, nil
}
// ServeHTTP implements the http.Handler.ServeHTTP.
func (app *Application) ServeHTTP(w http.ResponseWriter, r *http.Request) {
c := newContext()
c.Layout = app.Config.DefaultLayout
c.Request = newRequest(r)
c.Response = newResponse()
c.App = app
c.Errors = make(map[string][]*ParamError)
defer c.reuse()
defer func() {
if err := c.Response.writeTo(w); err != nil {
app.Logger.Error(err)
}
}()
if err := app.wrapMiddlewares(c)(); err != nil {
app.Logger.Error(err)
c.Response.reset()
http.Error(c.Response, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
}
// Invoke invokes newFunc.
// It invokes newFunc but will behave to fallback.
// When unit.ActiveIf returns false or any errors occurred in invoking, it invoke the defaultFunc if defaultFunc isn't nil.
// Also if any errors occurred at least once, next invoking will always invoke the defaultFunc.
func (app *Application) Invoke(unit Unit, newFunc func(), defaultFunc func()) {
name := reflect.TypeOf(unit).String()
defer func() {
if err := recover(); err != nil {
if err != ErrInvokeDefault {
app.logStackAndError(err)
app.mu.Lock()
app.failedUnits[name] = struct{}{}
app.mu.Unlock()
}
if defaultFunc != nil {
defaultFunc()
}
}
}()
app.mu.RLock()
_, failed := app.failedUnits[name]
app.mu.RUnlock()
if failed || !unit.ActiveIf() {
panic(ErrInvokeDefault)
}
newFunc()
}
func (app *Application) buildRouter() (err error) {
app.Router, err = app.Config.RouteTable.buildRouter()
return err
}
func (app *Application) buildResourceSet() error {
app.ResourceSet = app.Config.ResourceSet
return nil
}
func (app *Application) buildTemplate() (err error) {
app.Template, err = app.Config.Template.build(app)
return err
}
func (app *Application) buildLogger() error {
if app.Config.Logger == nil {
app.Config.Logger = &LoggerConfig{}
}
if app.Config.Logger.Writer == nil {
app.Config.Logger.Writer = os.Stdout
}
if app.Config.Logger.Formatter == nil {
app.Config.Logger.Formatter = &log.LTSVFormatter{}
}
app.Logger = log.New(app.Config.Logger.Writer, app.Config.Logger.Formatter, app.Config.Logger.Level)
return nil
}
func (app *Application) buildEvent() (err error) {
app.Event, err = app.Config.Event.build(app)
return err
}
func (app *Application) validateMiddlewares() error {
for _, m := range app.Config.Middlewares {
if v, ok := m.(Validator); ok {
if err := v.Validate(); err != nil {
return err
}
}
}
return nil
}
func (app *Application) wrapMiddlewares(c *Context) func() error {
wrapped := nullMiddlewareNext
for i := len(app.Config.Middlewares) - 1; i >= 0; i-- {
f, next := app.Config.Middlewares[i].Process, wrapped
wrapped = func() error {
return f(app, c, next)
}
}
return wrapped
}
func (app *Application) logStackAndError(err interface{}) {
buf := make([]byte, 4096)
n := runtime.Stack(buf, false)
app.Logger.Errorf("%v\n%s", err, buf[:n])
}
// Config represents a application-scope configuration.
type Config struct {
Addr string // listen address, DefaultHttpAddr if empty.
AppPath string // root path of the application.
AppName string // name of the application.
DefaultLayout string // name of the default layout.
Template *Template // template config.
RouteTable RouteTable // routing config.
Middlewares []Middleware // middlewares.
Logger *LoggerConfig // logger config.
Event *Event // event config.
MaxClientBodySize int64 // maximum size of request body, DefaultMaxClientBodySize if 0
ResourceSet ResourceSet
}
// Getenv is similar to os.Getenv.
// However, Getenv returns def value if the variable is not present, and
// sets def to environment variable.
func Getenv(key, def string) string {
env := os.Getenv(key)
if env != "" {
return env
}
os.Setenv(key, def)
return def
}
func init() {
_ = godotenv.Load()
}