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switch to std http implementation instead of fasthttp (#106)
close #100 close #109 close #113 close #28 close #63 Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/106
This commit is contained in:
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parent
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28 changed files with 827 additions and 584 deletions
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@ -1,20 +1,27 @@
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package upstream
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"net/http"
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"strings"
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"time"
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"github.com/rs/zerolog/log"
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"github.com/valyala/fasthttp"
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"codeberg.org/codeberg/pages/html"
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"codeberg.org/codeberg/pages/server/cache"
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"codeberg.org/codeberg/pages/server/context"
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"codeberg.org/codeberg/pages/server/gitea"
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)
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const (
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headerLastModified = "Last-Modified"
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headerIfModifiedSince = "If-Modified-Since"
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rawMime = "text/plain; charset=utf-8"
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)
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// upstreamIndexPages lists pages that may be considered as index pages for directories.
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var upstreamIndexPages = []string{
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"index.html",
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@ -35,61 +42,61 @@ type Options struct {
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// Used for debugging purposes.
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Host string
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DefaultMimeType string
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ForbiddenMimeTypes map[string]bool
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TryIndexPages bool
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BranchTimestamp time.Time
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TryIndexPages bool
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BranchTimestamp time.Time
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// internal
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appendTrailingSlash bool
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redirectIfExists string
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ServeRaw bool
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}
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// Upstream requests a file from the Gitea API at GiteaRoot and writes it to the request context.
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func (o *Options) Upstream(ctx *fasthttp.RequestCtx, giteaClient *gitea.Client, branchTimestampCache, fileResponseCache cache.SetGetKey) (final bool) {
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log := log.With().Strs("upstream", []string{o.TargetOwner, o.TargetRepo, o.TargetBranch, o.TargetPath, o.Host}).Logger()
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func (o *Options) Upstream(ctx *context.Context, giteaClient *gitea.Client) (final bool) {
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log := log.With().Strs("upstream", []string{o.TargetOwner, o.TargetRepo, o.TargetBranch, o.TargetPath}).Logger()
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if o.TargetOwner == "" || o.TargetRepo == "" {
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html.ReturnErrorPage(ctx, "either repo owner or name info is missing", http.StatusBadRequest)
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return true
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}
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// Check if the branch exists and when it was modified
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if o.BranchTimestamp.IsZero() {
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branch := GetBranchTimestamp(giteaClient, o.TargetOwner, o.TargetRepo, o.TargetBranch, branchTimestampCache)
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branch := GetBranchTimestamp(giteaClient, o.TargetOwner, o.TargetRepo, o.TargetBranch)
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if branch == nil {
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html.ReturnErrorPage(ctx, fasthttp.StatusFailedDependency)
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if branch == nil || branch.Branch == "" {
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html.ReturnErrorPage(ctx,
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fmt.Sprintf("could not get timestamp of branch %q", o.TargetBranch),
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http.StatusFailedDependency)
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return true
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}
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o.TargetBranch = branch.Branch
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o.BranchTimestamp = branch.Timestamp
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}
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if o.TargetOwner == "" || o.TargetRepo == "" || o.TargetBranch == "" {
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html.ReturnErrorPage(ctx, fasthttp.StatusBadRequest)
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return true
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}
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// Check if the browser has a cached version
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if ifModifiedSince, err := time.Parse(time.RFC1123, string(ctx.Request.Header.Peek("If-Modified-Since"))); err == nil {
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if !ifModifiedSince.Before(o.BranchTimestamp) {
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ctx.Response.SetStatusCode(fasthttp.StatusNotModified)
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return true
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if ctx.Response() != nil {
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if ifModifiedSince, err := time.Parse(time.RFC1123, string(ctx.Response().Header.Get(headerIfModifiedSince))); err == nil {
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if !ifModifiedSince.Before(o.BranchTimestamp) {
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ctx.RespWriter.WriteHeader(http.StatusNotModified)
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log.Trace().Msg("check response against last modified: valid")
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return true
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}
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}
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log.Trace().Msg("check response against last modified: outdated")
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}
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log.Debug().Msg("Preparing")
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// Make a GET request to the upstream URL
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uri := o.generateUri()
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var res *fasthttp.Response
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var cachedResponse gitea.FileResponse
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var err error
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if cachedValue, ok := fileResponseCache.Get(uri + "?timestamp=" + o.timestamp()); ok && !cachedValue.(gitea.FileResponse).IsEmpty() {
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cachedResponse = cachedValue.(gitea.FileResponse)
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} else {
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res, err = giteaClient.ServeRawContent(o.generateUriClientArgs())
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reader, header, statusCode, err := giteaClient.ServeRawContent(o.TargetOwner, o.TargetRepo, o.TargetBranch, o.TargetPath)
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if reader != nil {
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defer reader.Close()
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}
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log.Debug().Msg("Aquisting")
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// Handle errors
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if (err != nil && errors.Is(err, gitea.ErrorNotFound)) || (res == nil && !cachedResponse.Exists) {
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// Handle not found error
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if err != nil && errors.Is(err, gitea.ErrorNotFound) {
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if o.TryIndexPages {
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// copy the o struct & try if an index page exists
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optionsForIndexPages := *o
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@ -97,25 +104,20 @@ func (o *Options) Upstream(ctx *fasthttp.RequestCtx, giteaClient *gitea.Client,
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optionsForIndexPages.appendTrailingSlash = true
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for _, indexPage := range upstreamIndexPages {
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optionsForIndexPages.TargetPath = strings.TrimSuffix(o.TargetPath, "/") + "/" + indexPage
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if optionsForIndexPages.Upstream(ctx, giteaClient, branchTimestampCache, fileResponseCache) {
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_ = fileResponseCache.Set(uri+"?timestamp="+o.timestamp(), gitea.FileResponse{
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Exists: false,
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}, fileCacheTimeout)
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if optionsForIndexPages.Upstream(ctx, giteaClient) {
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return true
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}
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}
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// compatibility fix for GitHub Pages (/example → /example.html)
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optionsForIndexPages.appendTrailingSlash = false
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optionsForIndexPages.redirectIfExists = strings.TrimSuffix(string(ctx.Request.URI().Path()), "/") + ".html"
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optionsForIndexPages.redirectIfExists = strings.TrimSuffix(ctx.Path(), "/") + ".html"
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optionsForIndexPages.TargetPath = o.TargetPath + ".html"
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if optionsForIndexPages.Upstream(ctx, giteaClient, branchTimestampCache, fileResponseCache) {
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_ = fileResponseCache.Set(uri+"?timestamp="+o.timestamp(), gitea.FileResponse{
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Exists: false,
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}, fileCacheTimeout)
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if optionsForIndexPages.Upstream(ctx, giteaClient) {
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return true
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}
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}
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ctx.Response.SetStatusCode(fasthttp.StatusNotFound)
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ctx.StatusCode = http.StatusNotFound
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if o.TryIndexPages {
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// copy the o struct & try if a not found page exists
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optionsForNotFoundPages := *o
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@ -123,94 +125,84 @@ func (o *Options) Upstream(ctx *fasthttp.RequestCtx, giteaClient *gitea.Client,
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optionsForNotFoundPages.appendTrailingSlash = false
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for _, notFoundPage := range upstreamNotFoundPages {
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optionsForNotFoundPages.TargetPath = "/" + notFoundPage
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if optionsForNotFoundPages.Upstream(ctx, giteaClient, branchTimestampCache, fileResponseCache) {
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_ = fileResponseCache.Set(uri+"?timestamp="+o.timestamp(), gitea.FileResponse{
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Exists: false,
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}, fileCacheTimeout)
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if optionsForNotFoundPages.Upstream(ctx, giteaClient) {
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return true
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}
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}
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}
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if res != nil {
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// Update cache if the request is fresh
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_ = fileResponseCache.Set(uri+"?timestamp="+o.timestamp(), gitea.FileResponse{
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Exists: false,
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}, fileCacheTimeout)
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}
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return false
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}
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if res != nil && (err != nil || res.StatusCode() != fasthttp.StatusOK) {
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log.Warn().Msgf("Couldn't fetch contents from %q: %v (status code %d)", uri, err, res.StatusCode())
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html.ReturnErrorPage(ctx, fasthttp.StatusInternalServerError)
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// handle unexpected client errors
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if err != nil || reader == nil || statusCode != http.StatusOK {
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log.Debug().Msg("Handling error")
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var msg string
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if err != nil {
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msg = "gitea client returned unexpected error"
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log.Error().Err(err).Msg(msg)
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msg = fmt.Sprintf("%s: %v", msg, err)
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}
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if reader == nil {
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msg = "gitea client returned no reader"
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log.Error().Msg(msg)
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}
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if statusCode != http.StatusOK {
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msg = fmt.Sprintf("Couldn't fetch contents (status code %d)", statusCode)
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log.Error().Msg(msg)
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}
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html.ReturnErrorPage(ctx, msg, http.StatusInternalServerError)
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return true
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}
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// Append trailing slash if missing (for index files), and redirect to fix filenames in general
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// o.appendTrailingSlash is only true when looking for index pages
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if o.appendTrailingSlash && !bytes.HasSuffix(ctx.Request.URI().Path(), []byte{'/'}) {
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ctx.Redirect(string(ctx.Request.URI().Path())+"/", fasthttp.StatusTemporaryRedirect)
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if o.appendTrailingSlash && !strings.HasSuffix(ctx.Path(), "/") {
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ctx.Redirect(ctx.Path()+"/", http.StatusTemporaryRedirect)
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return true
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}
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if bytes.HasSuffix(ctx.Request.URI().Path(), []byte("/index.html")) {
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ctx.Redirect(strings.TrimSuffix(string(ctx.Request.URI().Path()), "index.html"), fasthttp.StatusTemporaryRedirect)
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if strings.HasSuffix(ctx.Path(), "/index.html") {
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ctx.Redirect(strings.TrimSuffix(ctx.Path(), "index.html"), http.StatusTemporaryRedirect)
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return true
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}
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if o.redirectIfExists != "" {
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ctx.Redirect(o.redirectIfExists, fasthttp.StatusTemporaryRedirect)
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ctx.Redirect(o.redirectIfExists, http.StatusTemporaryRedirect)
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return true
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}
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log.Debug().Msg("Handling error")
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// Set the MIME type
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mimeType := o.getMimeTypeByExtension()
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ctx.Response.Header.SetContentType(mimeType)
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// Set ETag
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if cachedResponse.Exists {
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ctx.Response.Header.SetBytesV(fasthttp.HeaderETag, cachedResponse.ETag)
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} else if res != nil {
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cachedResponse.ETag = res.Header.Peek(fasthttp.HeaderETag)
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ctx.Response.Header.SetBytesV(fasthttp.HeaderETag, cachedResponse.ETag)
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// Set ETag & MIME
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if eTag := header.Get(gitea.ETagHeader); eTag != "" {
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ctx.RespWriter.Header().Set(gitea.ETagHeader, eTag)
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}
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if ctx.Response.StatusCode() != fasthttp.StatusNotFound {
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// Everything's okay so far
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ctx.Response.SetStatusCode(fasthttp.StatusOK)
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if cacheIndicator := header.Get(gitea.PagesCacheIndicatorHeader); cacheIndicator != "" {
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ctx.RespWriter.Header().Set(gitea.PagesCacheIndicatorHeader, cacheIndicator)
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}
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ctx.Response.Header.SetLastModified(o.BranchTimestamp)
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if length := header.Get(gitea.ContentLengthHeader); length != "" {
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ctx.RespWriter.Header().Set(gitea.ContentLengthHeader, length)
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}
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if mime := header.Get(gitea.ContentTypeHeader); mime == "" || o.ServeRaw {
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ctx.RespWriter.Header().Set(gitea.ContentTypeHeader, rawMime)
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} else {
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ctx.RespWriter.Header().Set(gitea.ContentTypeHeader, mime)
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}
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ctx.RespWriter.Header().Set(headerLastModified, o.BranchTimestamp.In(time.UTC).Format(time.RFC1123))
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log.Debug().Msg("Prepare response")
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// Write the response body to the original request
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var cacheBodyWriter bytes.Buffer
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if res != nil {
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if res.Header.ContentLength() > fileCacheSizeLimit {
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// fasthttp else will set "Content-Length: 0"
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ctx.Response.SetBodyStream(&strings.Reader{}, -1)
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ctx.RespWriter.WriteHeader(ctx.StatusCode)
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err = res.BodyWriteTo(ctx.Response.BodyWriter())
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} else {
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// TODO: cache is half-empty if request is cancelled - does the ctx.Err() below do the trick?
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err = res.BodyWriteTo(io.MultiWriter(ctx.Response.BodyWriter(), &cacheBodyWriter))
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// Write the response body to the original request
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if reader != nil {
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_, err := io.Copy(ctx.RespWriter, reader)
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if err != nil {
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log.Error().Err(err).Msgf("Couldn't write body for %q", o.TargetPath)
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html.ReturnErrorPage(ctx, "", http.StatusInternalServerError)
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return true
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}
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} else {
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_, err = ctx.Write(cachedResponse.Body)
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}
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if err != nil {
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log.Error().Err(err).Msgf("Couldn't write body for %q", uri)
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html.ReturnErrorPage(ctx, fasthttp.StatusInternalServerError)
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return true
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}
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log.Debug().Msg("Sending response")
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if res != nil && res.Header.ContentLength() <= fileCacheSizeLimit && ctx.Err() == nil {
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cachedResponse.Exists = true
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cachedResponse.MimeType = mimeType
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cachedResponse.Body = cacheBodyWriter.Bytes()
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_ = fileResponseCache.Set(uri+"?timestamp="+o.timestamp(), cachedResponse, fileCacheTimeout)
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}
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return true
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}
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