hmn/src/website/requesthandling.go

122 lines
2.8 KiB
Go
Raw Normal View History

2021-03-18 02:14:06 +00:00
package website
import (
"bytes"
"context"
"io"
"net/http"
"net/url"
"git.handmade.network/hmn/hmn/src/logging"
"git.handmade.network/hmn/hmn/src/models"
2021-03-18 02:14:06 +00:00
"git.handmade.network/hmn/hmn/src/templates"
"github.com/julienschmidt/httprouter"
"github.com/rs/zerolog"
)
type HMNRouter struct {
HttpRouter *httprouter.Router
Wrappers []HMNHandlerWrapper
2021-03-18 02:14:06 +00:00
}
func (r *HMNRouter) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
r.HttpRouter.ServeHTTP(rw, req)
}
func (r *HMNRouter) Handle(method, route string, handler HMNHandler) {
for i := len(r.Wrappers) - 1; i >= 0; i-- {
handler = r.Wrappers[i](handler)
}
2021-03-18 02:14:06 +00:00
r.HttpRouter.Handle(method, route, handleHmnHandler(route, handler))
}
func (r *HMNRouter) GET(route string, handler HMNHandler) {
r.Handle(http.MethodGet, route, handler)
}
// TODO: POST, etc.
2021-03-18 02:14:06 +00:00
func (r *HMNRouter) ServeFiles(path string, root http.FileSystem) {
r.HttpRouter.ServeFiles(path, root)
}
func (r *HMNRouter) WithWrappers(wrappers ...HMNHandlerWrapper) *HMNRouter {
result := *r
result.Wrappers = append(result.Wrappers, wrappers...)
return &result
}
2021-03-18 02:14:06 +00:00
type HMNHandler func(c *RequestContext, p httprouter.Params)
type HMNHandlerWrapper func(h HMNHandler) HMNHandler
2021-03-18 02:14:06 +00:00
type RequestContext struct {
StatusCode int
Body *bytes.Buffer
Logger *zerolog.Logger
Req *http.Request
Errors []error
rw http.ResponseWriter
2021-03-18 02:14:06 +00:00
currentProject *models.Project
2021-03-18 02:14:06 +00:00
}
func newRequestContext(rw http.ResponseWriter, req *http.Request, route string) *RequestContext {
logger := logging.With().Str("route", route).Logger()
2021-03-18 02:14:06 +00:00
return &RequestContext{
StatusCode: http.StatusOK,
Body: new(bytes.Buffer),
Logger: &logger,
Req: req,
2021-03-18 02:14:06 +00:00
rw: rw,
2021-03-18 02:14:06 +00:00
}
}
func (c *RequestContext) Context() context.Context {
return c.Req.Context()
2021-03-18 02:14:06 +00:00
}
func (c *RequestContext) URL() *url.URL {
return c.Req.URL
2021-03-18 02:14:06 +00:00
}
func (c *RequestContext) Headers() http.Header {
return c.rw.Header()
}
func (c *RequestContext) WriteTemplate(name string, data interface{}) error {
return templates.Templates[name].Execute(c.Body, data)
}
func (c *RequestContext) AddErrors(errs ...error) {
c.Errors = append(c.Errors, errs...)
}
func (c *RequestContext) AbortWithErrors(status int, errs ...error) {
c.StatusCode = status
c.AddErrors(errs...)
}
2021-03-18 02:14:06 +00:00
func handleHmnHandler(route string, h HMNHandler) httprouter.Handle {
return func(rw http.ResponseWriter, r *http.Request, p httprouter.Params) {
c := newRequestContext(rw, r, route)
defer func() {
/*
This panic recovery is the last resort. If you want to render
an error page or something, make it a request wrapper.
*/
if recovered := recover(); recovered != nil {
rw.WriteHeader(http.StatusInternalServerError)
logging.LogPanicValue(c.Logger, recovered, "request panicked and was not handled")
}
}()
2021-03-18 02:14:06 +00:00
h(c, p)
rw.WriteHeader(c.StatusCode)
io.Copy(rw, c.Body)
}
}