Let's start caching some of the backlog data on the server

socketserver/internal/server/backlog.go

@@ -1 +1,89 @@
 package server
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+)
+
+// this value is just docs right now
+var ServerInitiatedCommands = []string{
+	/// Global updates & notices
+	"update_news", // timecache:global
+	"message",     // timecache:global
+	"reload_ff",   // timecache:global
+
+	/// Emote updates
+	"reload_badges", // timecache:global
+	"set_badge",     // timecache:multichat
+	"reload_set",    // timecache:multichat
+	"load_set",      // TODO what are the semantics of this?
+
+	/// User auth
+	"do_authorize", // nocache:single
+
+	/// Channel data
+	// extra emote sets included in the chat
+	"follow_sets", // mustcache:chat
+	// extra follow buttons below the stream
+	"follow_buttons", // mustcache:watching
+	// SRL race data
+	"srl_race", // cachelast:watching
+
+	/// Chatter/viewer counts
+	"chatters", // cachelast:watching
+	"viewers",  // cachelast:watching
+}
+var _ = ServerInitiatedCommands
+
+type BacklogCacheType int
+
+const (
+	// This is not a cache type.
+	CacheTypeInvalid BacklogCacheType = iota
+	// This message cannot be cached.
+	CacheTypeNever
+	// Save the last 24 hours of this message.
+	// If a client indicates that it has reconnected, replay the messages sent after the disconnect.
+	CacheTypeTimestamps
+	// Save only the last copy of this message, and always send it when the backlog is requested.
+	CacheTypeLastOnly
+	// Save this backlog data to disk with its timestamp.
+	// Send it when the backlog is requested, or after a reconnect if it was updated.
+	CacheTypePersistent
+)
+
+type MessageTargetType int
+
+const (
+	// This is not a message target.
+	MsgTargetTypeInvalid MessageTargetType = iota
+	// This message is targeted to a single TODO(user or connection)
+	MsgTargetTypeSingle
+	// This message is targeted to all users in a chat
+	MsgTargetTypeChat
+	// This message is targeted to all users in multiple chats
+	MsgTargetTypeMultichat
+	// This message is targeted to all users watching a stream
+	MsgTargetTypeWatching
+	// This message is sent to all FFZ users.
+	MsgTargetTypeGlobal
+)
+
+// Returned by BacklogCacheType.UnmarshalJSON()
+var ErrorUnrecognizedCacheType = errors.New("Invalid value for cachetype")
+
+// Returned by MessageTargetType.UnmarshalJSON()
+var ErrorUnrecognizedTargetType = errors.New("Invalid value for message target")
+
+// note: see types.go for methods on these
+
+func HBackendSaveBacklog(w http.ResponseWriter, r *http.Request) {
+	formData, err := UnsealRequest(r.Form)
+	if err != nil {
+		w.WriteHeader(403)
+		fmt.Fprintf(w, "Error: %v", err)
+		return
+	}
+
+}