144 lines
3.5 KiB
Go
144 lines
3.5 KiB
Go
package queue
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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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"sync/atomic"
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"time"
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"forge.cadoles.com/Cadoles/go-proxy"
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"forge.cadoles.com/cadoles/bouncer/internal/proxy/director"
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"forge.cadoles.com/cadoles/bouncer/internal/store"
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"github.com/google/uuid"
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"github.com/pkg/errors"
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"gitlab.com/wpetit/goweb/logger"
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)
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const LayerType store.LayerType = "queue"
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type Queue struct {
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adapter Adapter
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refreshJobRunning uint32
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}
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// LayerType implements director.MiddlewareLayer
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func (q *Queue) LayerType() store.LayerType {
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return LayerType
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}
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// Middleware implements director.MiddlewareLayer
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func (q *Queue) Middleware(layer *store.Layer) proxy.Middleware {
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return func(h http.Handler) http.Handler {
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fn := func(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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options, err := fromStoreOptions(layer.Options)
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if err != nil {
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logger.Error(ctx, "could not parse layer options", logger.E(errors.WithStack(err)))
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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cookieName := q.getCookieName(layer.Name)
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cookie, err := r.Cookie(cookieName)
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if err != nil && !errors.Is(err, http.ErrNoCookie) {
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logger.Error(ctx, "could not retrieve cookie", logger.E(errors.WithStack(err)))
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}
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if cookie == nil {
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cookie = &http.Cookie{
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Name: cookieName,
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Value: uuid.NewString(),
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Path: "/",
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}
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w.Header().Add("Set-Cookie", cookie.String())
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}
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sessionID := cookie.Value
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queueName := string(layer.Name)
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q.refreshQueue(queueName, options.KeepAlive)
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rank, err := q.adapter.Touch(ctx, queueName, sessionID)
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if err != nil {
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logger.Error(ctx, "could not retrieve session rank", logger.E(errors.WithStack(err)))
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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if rank >= options.Capacity {
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q.renderQueuePage(w, r, queueName, options, rank)
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return
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}
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ctx = logger.With(ctx,
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logger.F("queueSessionId", sessionID),
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logger.F("queueName", queueName),
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logger.F("queueSessionRank", rank),
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)
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r = r.WithContext(ctx)
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h.ServeHTTP(w, r)
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}
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return http.HandlerFunc(fn)
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}
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}
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func (q *Queue) renderQueuePage(w http.ResponseWriter, r *http.Request, queueName string, options *LayerOptions, rank int64) {
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ctx := r.Context()
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status, err := q.adapter.Status(ctx, queueName)
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if err != nil {
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logger.Error(ctx, "could not retrieve queue status", logger.E(errors.WithStack(err)))
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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http.Error(w, fmt.Sprintf("queued (rank: %d, status: %d/%d)", rank+1, status.Sessions, options.Capacity), http.StatusServiceUnavailable)
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}
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func (q *Queue) refreshQueue(queueName string, keepAlive time.Duration) {
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if !atomic.CompareAndSwapUint32(&q.refreshJobRunning, 0, 1) {
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return
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}
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go func() {
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defer atomic.StoreUint32(&q.refreshJobRunning, 0)
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ctx, cancel := context.WithTimeout(context.Background(), keepAlive*2)
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defer cancel()
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if err := q.adapter.Refresh(ctx, queueName, keepAlive); err != nil {
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logger.Error(ctx, "could not refresh queue",
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logger.E(errors.WithStack(err)),
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logger.F("queue", queueName),
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)
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}
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}()
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}
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func (q *Queue) getCookieName(layerName store.LayerName) string {
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return fmt.Sprintf("_%s_%s", LayerType, layerName)
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}
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func New(adapter Adapter, funcs ...OptionFunc) *Queue {
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opts := defaultOptions()
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for _, fn := range funcs {
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fn(opts)
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}
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return &Queue{
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adapter: adapter,
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}
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}
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var _ director.MiddlewareLayer = &Queue{}
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