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Decouple the different contexts from each other (#24786)

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Replace #16455

Close #21803

Mixing different Gitea contexts together causes some problems:

1. Unable to respond proper content when error occurs, eg: Web should
respond HTML while API should respond JSON
2. Unclear dependency, eg: it's unclear when Context is used in
APIContext, which fields should be initialized, which methods are
necessary.


To make things clear, this PR introduces a Base context, it only
provides basic Req/Resp/Data features.

This PR mainly moves code. There are still many legacy problems and
TODOs in code, leave unrelated changes to future PRs.
This commit is contained in:
wxiaoguang 2023-05-21 09:50:53 +08:00 • committed by GitHub
parent 6ba4f89723
commit 6b33152b7d
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57 changed files with 885 additions and 781 deletions
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15
modules/web/handler.go
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@ -10,6 +10,7 @@ import (
"reflect"
"code.gitea.io/gitea/modules/context"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/web/routing"
)
@ -25,6 +26,10 @@ var argTypeProvider = map[reflect.Type]func(req *http.Request) ResponseStatusPro
reflect.TypeOf(&context.PrivateContext{}): func(req *http.Request) ResponseStatusProvider { return context.GetPrivateContext(req) },
}
func RegisterHandleTypeProvider[T any](fn func(req *http.Request) ResponseStatusProvider) {
argTypeProvider[reflect.TypeOf((*T)(nil)).Elem()] = fn
}
// responseWriter is a wrapper of http.ResponseWriter, to check whether the response has been written
type responseWriter struct {
respWriter http.ResponseWriter
@ -78,7 +83,13 @@ func preCheckHandler(fn reflect.Value, argsIn []reflect.Value) {
}
}
func prepareHandleArgsIn(resp http.ResponseWriter, req *http.Request, fn reflect.Value) []reflect.Value {
func prepareHandleArgsIn(resp http.ResponseWriter, req *http.Request, fn reflect.Value, fnInfo *routing.FuncInfo) []reflect.Value {
defer func() {
if err := recover(); err != nil {
log.Error("unable to prepare handler arguments for %s: %v", fnInfo.String(), err)
panic(err)
}
}()
isPreCheck := req == nil
argsIn := make([]reflect.Value, fn.Type().NumIn())
@ -155,7 +166,7 @@ func toHandlerProvider(handler any) func(next http.Handler) http.Handler {
}
// prepare the arguments for the handler and do pre-check
argsIn := prepareHandleArgsIn(resp, req, fn)
argsIn := prepareHandleArgsIn(resp, req, fn, funcInfo)
if req == nil {
preCheckHandler(fn, argsIn)
return // it's doing pre-check, just return