This repository has been archived by the owner on Nov 11, 2023. It is now read-only.
/
wool.go
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/
wool.go
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package wool
import (
"context"
"errors"
"fmt"
"github.com/gowool/wool/render"
"golang.org/x/exp/slog"
"net"
"net/http"
"net/http/httputil"
"os"
"runtime"
"strings"
"sync"
"time"
)
var (
DefaultNotFoundHandler = func(c Ctx) error {
return NewErrNotFound(nil)
}
DefaultMethodNotAllowed = func(Ctx) error {
return NewErrMethodNotAllowed(nil)
}
DefaultOptionsHandler = func(c Ctx) error {
return c.NoContent()
}
DefaultErrorHandler = func(c Ctx, err *Error) error {
switch c.NegotiateFormat(MIMETextPlain, MIMETextHTML, MIMEApplicationJSON) {
case MIMEApplicationJSON:
return c.JSON(err.Code, err)
default:
if c.Debug() {
return c.String(err.Code, "code=%d, message=%v, data=%v, developer_message=%s", err.Code, err.Message, err.Data, err.Developer)
}
return c.String(err.Code, "code=%d, message=%v, data=%v", err.Code, err.Message, err.Data)
}
}
DefaultErrorTransform = func(err error) *Error {
var e *Error
if !errors.As(err, &e) {
e = NewError(http.StatusInternalServerError, err)
}
return e
}
)
type (
Handler func(c Ctx) error
Middleware func(next Handler) Handler
ErrorHandler func(c Ctx, err *Error) error
ErrorTransform func(err error) *Error
AfterServe func(c Ctx, start, end time.Time, err error)
)
type Wool struct {
Log *slog.Logger
NewCtxFunc func(wool *Wool, r *http.Request, w http.ResponseWriter) Ctx
HTMLRender render.HTMLRender
NotFoundHandler Handler
MethodNotAllowed Handler
OptionsHandler Handler
ErrorHandler ErrorHandler
ErrorTransform ErrorTransform
AfterServe AfterServe
Validator Validator
middlewares []Middleware
ctxPool *sync.Pool
routes *[]route
prefix string
}
func ToHandler(handler http.Handler) Handler {
return func(c Ctx) error {
handler.ServeHTTP(c.Res(), c.Req().Request)
return nil
}
}
func ToMiddleware(wrapper func(http.Handler) http.Handler) Middleware {
return func(next Handler) Handler {
return func(c Ctx) (err error) {
wrapper(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
c.SetReq(c.Req().WithContext(r.Context()))
err = next(c)
})).ServeHTTP(c.Res(), c.Req().Request)
return
}
}
}
type Option func(*Wool)
func WithNewCtxFunc(newCtxFunc func(*Wool, *http.Request, http.ResponseWriter) Ctx) Option {
return func(w *Wool) {
w.NewCtxFunc = newCtxFunc
}
}
func WithHTMLRender(r render.HTMLRender) Option {
return func(w *Wool) {
w.HTMLRender = r
}
}
func WithNotFoundHandler(h Handler) Option {
return func(w *Wool) {
w.NotFoundHandler = h
}
}
func WithMethodNotAllowed(h Handler) Option {
return func(w *Wool) {
w.MethodNotAllowed = h
}
}
func WithOptionsHandler(h Handler) Option {
return func(w *Wool) {
w.OptionsHandler = h
}
}
func WithErrorHandler(h ErrorHandler) Option {
return func(w *Wool) {
w.ErrorHandler = h
}
}
func WithErrorTransform(et ErrorTransform) Option {
return func(w *Wool) {
w.ErrorTransform = et
}
}
func WithAfterServe(as AfterServe) Option {
return func(w *Wool) {
w.AfterServe = as
}
}
func WithValidator(v Validator) Option {
return func(w *Wool) {
w.Validator = v
}
}
func WithMiddleware(mw ...Middleware) Option {
return func(w *Wool) {
w.Use(mw...)
}
}
func New(logger *slog.Logger, options ...Option) *Wool {
if logger == nil {
panic("logger is nil")
}
wool := &Wool{
Log: logger,
NewCtxFunc: NewCtx,
HTMLRender: &render.HTMLEngine{},
NotFoundHandler: DefaultNotFoundHandler,
MethodNotAllowed: DefaultMethodNotAllowed,
OptionsHandler: DefaultOptionsHandler,
ErrorHandler: DefaultErrorHandler,
ErrorTransform: DefaultErrorTransform,
Validator: NewValidator(),
ctxPool: &sync.Pool{},
routes: &[]route{},
}
wool.ctxPool.New = func() any {
return wool.NewCtx(nil, nil)
}
for _, opt := range options {
opt(wool)
}
return wool
}
func (wool *Wool) Debug(ctx context.Context) bool {
return wool.Log.Enabled(ctx, slog.LevelDebug)
}
func (wool *Wool) NewCtx(r *http.Request, w http.ResponseWriter) Ctx {
return wool.NewCtxFunc(wool, r, w)
}
func (wool *Wool) Use(mw ...Middleware) {
wool.middlewares = append(wool.middlewares, mw...)
}
func (wool *Wool) Group(pattern string, fn func(*Wool)) {
mm := *wool
mm.prefix += pattern
fn(&mm)
}
func (wool *Wool) AcquireCtx() Ctx {
return wool.ctxPool.Get().(Ctx)
}
func (wool *Wool) ReleaseCtx(c Ctx) {
wool.ctxPool.Put(c)
}
func (wool *Wool) ServeHTTP(w http.ResponseWriter, r *http.Request) {
c := wool.AcquireCtx()
c.Reset(r, w)
var start, end time.Time
if wool.AfterServe != nil {
start = time.Now()
}
err := wool.serve(c)
if wool.AfterServe != nil {
end = time.Now()
wool.AfterServe(c, start, end, err)
}
wool.ReleaseCtx(c)
}
func (wool *Wool) Error(next Handler) Handler {
return func(c Ctx) error {
if err := next(c); err != nil {
e := wool.ErrorTransform(err)
if c.Debug() && e.Internal != nil {
e.Developer = e.Internal.Error()
}
if err = wool.ErrorHandler(c, e); err != nil {
wool.Log.Error("UNKNOWN ERROR", "err", err)
}
return e
}
return nil
}
}
func (wool *Wool) Recover(next Handler) Handler {
return func(c Ctx) (err error) {
defer func() {
if r := recover(); r != nil {
var ok bool
if err, ok = r.(error); !ok {
err = fmt.Errorf("%v", r)
}
var brokenPipe bool
if ne, ok := r.(*net.OpError); ok {
if se, ok := ne.Err.(*os.SyscallError); ok {
if strings.Contains(strings.ToLower(se.Error()), "broken pipe") ||
strings.Contains(strings.ToLower(se.Error()), "connection reset by peer") {
brokenPipe = true
}
}
}
httpRequest, _ := httputil.DumpRequest(c.Req().Request, false)
if brokenPipe {
wool.Log.Error(c.Req().URL.Path, "err", err, "request", string(httpRequest))
return
}
stack := make([]byte, 4<<10) // 4KB
length := runtime.Stack(stack, true)
stack = stack[:length]
wool.Log.Error("recover from panic", "err", err, "request", string(httpRequest), "stack", string(stack))
}
}()
return next(c)
}
}
func (wool *Wool) serve(c Ctx) error {
urlSegments := strings.Split(c.Req().URL.Path, "/")
allowedMethods := make([]string, 0, len(DefaultMethods))
for _, route := range *wool.routes {
ctx, ok := route.match(c.Req().Context(), urlSegments)
if ok {
if c.Req().Method == route.method {
c.SetReq(c.Req().WithContext(ctx))
return route.handler(c)
}
if !contains(allowedMethods, route.method) {
allowedMethods = append(allowedMethods, route.method)
}
}
}
if len(allowedMethods) > 0 {
c.Res().Header().Set("Allow", strings.Join(append(allowedMethods, http.MethodOptions), ","))
if c.Req().Method == http.MethodOptions {
return wool.wrap(wool.OptionsHandler)(c)
}
return wool.wrap(wool.MethodNotAllowed)(c)
}
return wool.wrap(wool.NotFoundHandler)(c)
}
func (wool *Wool) wrap(handler Handler) Handler {
for i := len(wool.middlewares) - 1; i >= 0; i-- {
handler = wool.middlewares[i](handler)
}
handler = wool.Recover(handler)
handler = wool.Error(handler)
return handler
}