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FIX blank internal pages (#164) (#292)

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Hello 👋

since it affected my deployment of the pages server I started to look into the problem of the blank pages and think I found a solution for it:

1. There is no check if the file response is empty, neither in cache retrieval nor in writing of a cache. Also the provided method for checking for empty responses had a bug.
2. I identified the redirect response to be the issue here. There is a cache write with the full cache key (e. g. rawContent/user/repo|branch|route/index.html) happening in the handling of the redirect response. But the written body here is empty. In the triggered request from the redirect response the server then finds a cache item to the key and serves the empty body. A quick fix is the check for empty file responses mentioned in 1.
3. The decision to redirect the user comes quite far down in the upstream function. Before that happens a lot of stuff that may not be important since after the redirect response comes a new request anyway. Also, I suspect that this causes the caching problem because there is a request to the forge server and its error handling with some recursions happening before. I propose to move two of the redirects before "Preparing"
4. The recursion in the upstream function makes it difficult to understand what is actually happening. I added some more logging to have an easier time with that.
5. I changed the default behaviour to append a trailing slash to the path to true. In my tested scenarios it happened anyway. This way there is no recursion happening before the redirect.

I am not developing in go frequently and rarely contribute to open source -> so feedback of all kind is appreciated

closes #164

Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/292
Reviewed-by: 6543 <6543@obermui.de>
Reviewed-by: crapStone <codeberg@crapstone.dev>
Co-authored-by: Hoernschen <julian.hoernschemeyer@mailbox.org>
Co-committed-by: Hoernschen <julian.hoernschemeyer@mailbox.org>
This commit is contained in:
Hoernschen 2024-02-26 22:21:42 +00:00 • committed by crapStone
parent 7e80ade24b
commit a6e9510c07
4 changed files with 41 additions and 16 deletions
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25
server/gitea/cache.go
View file

@ -39,7 +39,7 @@ type FileResponse struct {
}
func (f FileResponse) IsEmpty() bool {
return len(f.Body) != 0
return len(f.Body) == 0
}
func (f FileResponse) createHttpResponse(cacheKey string) (header http.Header, statusCode int) {
@ -72,13 +72,14 @@ type BranchTimestamp struct {
type writeCacheReader struct {
originalReader io.ReadCloser
buffer *bytes.Buffer
rileResponse *FileResponse
fileResponse *FileResponse
cacheKey string
cache cache.ICache
hasError bool
}
func (t *writeCacheReader) Read(p []byte) (n int, err error) {
log.Trace().Msgf("[cache] read %q", t.cacheKey)
n, err = t.originalReader.Read(p)
if err != nil && err != io.EOF {
log.Trace().Err(err).Msgf("[cache] original reader for %q has returned an error", t.cacheKey)
@ -90,12 +91,20 @@ func (t *writeCacheReader) Read(p []byte) (n int, err error) {
}
func (t *writeCacheReader) Close() error {
if !t.hasError {
fc := *t.rileResponse
fc.Body = t.buffer.Bytes()
_ = t.cache.Set(t.cacheKey, fc, fileCacheTimeout)
doWrite := !t.hasError
fc := *t.fileResponse
fc.Body = t.buffer.Bytes()
if fc.IsEmpty() {
log.Trace().Msg("[cache] file response is empty")
doWrite = false
}
log.Trace().Msgf("cacheReader for %q saved=%t closed", t.cacheKey, !t.hasError)
if doWrite {
err := t.cache.Set(t.cacheKey, fc, fileCacheTimeout)
if err != nil {
log.Trace().Err(err).Msgf("[cache] writer for %q has returned an error", t.cacheKey)
}
}
log.Trace().Msgf("cacheReader for %q saved=%t closed", t.cacheKey, doWrite)
return t.originalReader.Close()
}
@ -108,7 +117,7 @@ func (f FileResponse) CreateCacheReader(r io.ReadCloser, cache cache.ICache, cac
return &writeCacheReader{
originalReader: r,
buffer: bytes.NewBuffer(make([]byte, 0)),
rileResponse: &f,
fileResponse: &f,
cache: cache,
cacheKey: cacheKey,
}