internal/component => internal/dis/component
This commit is contained in:
Tom Wiesing
parent
9443217441
commit
b5b1ce2340
123 changed files with 76 additions and 76 deletions
70
internal/dis/component/home/home.go
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70
internal/dis/component/home/home.go
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package home
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import (
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"context"
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"fmt"
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"net/http"
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"time"
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"github.com/FAU-CDI/wisski-distillery/internal/dis/component"
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"github.com/FAU-CDI/wisski-distillery/internal/dis/component/instances"
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"github.com/FAU-CDI/wisski-distillery/pkg/lazy"
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"github.com/tkw1536/goprogram/stream"
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)
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type Home struct {
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component.Base
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Instances *instances.Instances
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RefreshInterval time.Duration
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redirect lazy.Lazy[*Redirect]
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instanceNames lazy.Lazy[map[string]struct{}]
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homeBytes lazy.Lazy[[]byte]
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}
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func (*Home) Routes() []string { return []string{"/"} }
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func (home *Home) Handler(route string, context context.Context, io stream.IOStream) (http.Handler, error) {
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home.updateRedirect(context, io)
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home.updateInstances(context, io)
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home.updateRender(context, io)
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return home, nil
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}
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func (home *Home) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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slug, ok := home.Config.SlugFromHost(r.Host)
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switch {
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case !ok:
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http.NotFound(w, r)
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case slug != "":
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home.serveWissKI(w, slug, r)
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default:
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home.serveRoot(w, r)
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}
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}
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func (home *Home) serveRoot(w http.ResponseWriter, r *http.Request) {
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// not the root url => server the fallback
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if !(r.URL.Path == "" || r.URL.Path == "/") {
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home.redirect.Get(nil).ServeHTTP(w, r)
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return
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}
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w.Header().Set("Content-Type", "text/html")
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w.WriteHeader(http.StatusAccepted)
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w.Write(home.homeBytes.Get(nil))
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}
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func (home *Home) serveWissKI(w http.ResponseWriter, slug string, r *http.Request) {
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if _, ok := home.instanceNames.Get(nil)[slug]; !ok {
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// Get(nil) guaranteed to work by precondition
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w.WriteHeader(http.StatusNotFound)
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fmt.Fprintf(w, "WissKI %q not found\n", slug)
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return
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}
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w.WriteHeader(http.StatusBadGateway)
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fmt.Fprintf(w, "WissKI %q is currently offline\n", slug)
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}
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40
internal/dis/component/home/home.html
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40
internal/dis/component/home/home.html
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<!DOCTYPE html>
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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>WissKI Distillery</title>
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{{ CSS }}
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</head>
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<body>
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<header>
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<h1>WissKI Distillery</h1>
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</header>
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<main>
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<div class="pure-g">
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<div class="pure-u-1">
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<p>
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For more information, see <a href="{{ .SelfRedirect }}">{{ .SelfRedirect }}</a>.
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</p>
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</div>
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<div class="pure-u-1">
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<h2>WissKIs on this Distillery</h2>
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</div>
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{{range .Instances}}
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{{ if .Running }}
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<div class="pure-u-1-3">
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<h3>{{.Slug}}</h3>
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<p>
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<a href="{{.URL}}" target="_blank" rel="noopener noreferrer">{{.URL}}</a><br>
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</p>
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</div>
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{{ end }}
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{{ end }}
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</main>
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<footer>
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Generated at <code>{{ .Time }}</code>
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</footer>
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{{ JS }}
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</body>
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94
internal/dis/component/home/public.go
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94
internal/dis/component/home/public.go
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@ -0,0 +1,94 @@
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package home
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import (
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"bytes"
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"context"
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"time"
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_ "embed"
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"github.com/FAU-CDI/wisski-distillery/internal/dis/component/static"
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"github.com/FAU-CDI/wisski-distillery/internal/wisski"
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"github.com/FAU-CDI/wisski-distillery/pkg/timex"
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"github.com/tkw1536/goprogram/stream"
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"golang.org/x/sync/errgroup"
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)
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func (home *Home) updateInstances(ctx context.Context, io stream.IOStream) {
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go func() {
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for t := range timex.TickContext(ctx, home.RefreshInterval) {
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io.Printf("[%s]: reloading instance list\n", t.Format(time.Stamp))
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names, _ := home.instanceMap()
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home.instanceNames.Set(names)
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}
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}()
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}
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func (home *Home) instanceMap() (map[string]struct{}, error) {
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wissKIs, err := home.Instances.All()
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if err != nil {
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return nil, err
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}
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names := make(map[string]struct{}, len(wissKIs))
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for _, w := range wissKIs {
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names[w.Slug] = struct{}{}
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}
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return names, nil
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}
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func (home *Home) updateRender(ctx context.Context, io stream.IOStream) {
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go func() {
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for t := range timex.TickContext(ctx, home.RefreshInterval) {
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io.Printf("[%s]: reloading home render\n", t.Format(time.Stamp))
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bytes, _ := home.homeRender()
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home.homeBytes.Set(bytes)
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}
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}()
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}
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//go:embed "home.html"
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var homeHTMLStr string
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var homeTemplate = static.AssetsHomeHome.MustParse(homeHTMLStr)
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func (home *Home) homeRender() ([]byte, error) {
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var context HomeContext
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// setup a couple of static things
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context.Time = time.Now().UTC()
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context.SelfRedirect = home.Config.SelfRedirect.String()
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// find all the WissKIs
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wissKIs, err := home.Instances.All()
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if err != nil {
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return nil, err
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}
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context.Instances = make([]wisski.WissKIInfo, len(wissKIs))
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// determine their infos
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var eg errgroup.Group
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for i, instance := range wissKIs {
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i := i
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wissKI := instance
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eg.Go(func() (err error) {
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context.Instances[i], err = wissKI.Info(true)
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return
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})
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}
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eg.Wait()
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// render the template
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var buffer bytes.Buffer
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homeTemplate.Execute(&buffer, context)
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return buffer.Bytes(), nil
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}
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type HomeContext struct {
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Instances []wisski.WissKIInfo
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Time time.Time
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SelfRedirect string
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}
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117
internal/dis/component/home/redirect.go
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117
internal/dis/component/home/redirect.go
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package home
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import (
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"context"
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"encoding/json"
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"net/http"
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"strings"
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"time"
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"github.com/FAU-CDI/wisski-distillery/pkg/timex"
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"github.com/tkw1536/goprogram/stream"
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)
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func (home *Home) updateRedirect(ctx context.Context, io stream.IOStream) {
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go func() {
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for t := range timex.TickContext(ctx, home.RefreshInterval) {
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io.Printf("[%s]: reloading overrides\n", t.Format(time.Stamp))
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redirect, _ := home.loadRedirect()
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home.redirect.Set(&redirect)
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}
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}()
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}
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func (home *Home) loadRedirect() (redirect Redirect, err error) {
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if redirect.Overrides == nil {
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redirect.Overrides = make(map[string]string)
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}
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redirect.Overrides[""] = home.Config.SelfRedirect.String()
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redirect.Absolute = false
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redirect.Permanent = false
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// load the overrides file
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overrides, err := home.Environment.Open(home.Config.SelfOverridesFile)
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if err != nil {
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return redirect, err
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}
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defer overrides.Close()
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// decode the overrides file
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if err := json.NewDecoder(overrides).Decode(&redirect.Overrides); err != nil {
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return redirect, err
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}
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// and return!
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return redirect, nil
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}
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// Redirect implements a redirect server that redirects all requests.
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// It implements http.Handler.
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type Redirect struct {
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// Target is the target URL to redirect to.
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Target string
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// Fallback is used when target is the empty string.
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Fallback http.Handler
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// Absolute determines if the request path should be appended to the target URL when redirecting.
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// By default this path is always appended, set Absolute to true to prevent this.
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Absolute bool
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// Overrides is a map from paths to URLs that should override the default target.
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Overrides map[string]string
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// Permanent determines if the redirect responses issued should return
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// Permanent Redirect (Status Code 308) or Temporary Redirect (Status Code 307).
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Permanent bool
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}
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// Redirect determines the redirect URL for a specific incoming request
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// If it returns the empty string, the fallback is used.
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func (redirect Redirect) Redirect(r *http.Request) string {
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// if we have an override for this URL, use it immediatly
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url := strings.TrimSuffix(r.URL.Path, "/")
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if override, ok := redirect.Overrides[url]; ok {
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return override
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}
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if redirect.Target == "" {
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return ""
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}
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// if we are in absolute redirect mode, always return the absolute URL
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if redirect.Absolute {
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return redirect.Target
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}
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// return the target + the redirected URL
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dest := strings.TrimSuffix(redirect.Target, "/") + r.URL.Path
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if len(r.URL.RawQuery) > 0 {
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dest += "?" + r.URL.RawQuery
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}
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return dest
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}
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// ServeHTTP implements the http.Handler interface and redirects a single request to redirect.Target.
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func (redirect Redirect) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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dest := redirect.Redirect(r)
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if dest == "" {
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if redirect.Fallback == nil {
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http.NotFound(w, r)
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return
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}
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redirect.Fallback.ServeHTTP(w, r)
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return
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}
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// determine if we are temporary or permanent redirect
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status := http.StatusTemporaryRedirect
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if redirect.Permanent {
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status = http.StatusPermanentRedirect
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}
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// and do the redirect
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http.Redirect(w, r, dest, status)
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}
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