Reduce usage of strformat, minor perf improvement

src/routes/rss.nim

@@ -10,6 +10,11 @@ include "../views/rss.nimf"
 
 export times, hashes
 
+proc redisKey*(page, name, cursor: string): string =
+  result = page & ":" & name
+  if cursor.len > 0:
+    result &= ":" & cursor
+
 proc timelineRss*(req: Request; cfg: Config; query: Query): Future[Rss] {.async.} =
   var profile: Profile
   let
@@ -42,8 +47,8 @@ proc timelineRss*(req: Request; cfg: Config; query: Query): Future[Rss] {.async.
 template respRss*(rss, page) =
   if rss.cursor.len == 0:
     let info = case page
-               of "User": &""" "{@"name"}" """
-               of "List": &""" "{@"id"}" """
+               of "User": " \"" & @"name" & "\" "
+               of "List": " \"" & @"id" & "\" "
                else: " "
 
     resp Http404, showError(page & info & "not found", cfg)
@@ -67,7 +72,7 @@ proc createRssRouter*(cfg: Config) =
 
       let
         cursor = getCursor()
-        key = &"search:{hash(genQueryUrl(query))}:cursor"
+        key = redisKey("search", $hash(genQueryUrl(query)), cursor)
 
       var rss = await getCachedRss(key)
       if rss.cursor.len > 0:
@@ -84,9 +89,8 @@ proc createRssRouter*(cfg: Config) =
       cond cfg.enableRss
       cond '.' notin @"name"
       let
-        cursor = getCursor()
         name = @"name"
-        key = &"twitter:{name}:{cursor}"
+        key = redisKey("twitter", name, getCursor())
 
       var rss = await getCachedRss(key)
       if rss.cursor.len > 0:
@@ -101,18 +105,20 @@ proc createRssRouter*(cfg: Config) =
       cond cfg.enableRss
       cond '.' notin @"name"
       cond @"tab" in ["with_replies", "media", "search"]
-      let name = @"name"
-      let query =
-        case @"tab"
-        of "with_replies": getReplyQuery(name)
-        of "media": getMediaQuery(name)
-        of "search": initQuery(params(request), name=name)
-        else: Query(fromUser: @[name])
+      let
+        name = @"name"
+        tab = @"tab"
+        query =
+          case tab
+          of "with_replies": getReplyQuery(name)
+          of "media": getMediaQuery(name)
+          of "search": initQuery(params(request), name=name)
+          else: Query(fromUser: @[name])
 
-      var key = &"""{@"tab"}:{@"name"}:"""
-      if @"tab" == "search":
-        key &= $hash(genQueryUrl(query)) & ":"
-      key &= getCursor()
+      let searchKey = if tab != "search": ""
+                      else: ":" & $hash(genQueryUrl(query))
+
+      let key = redisKey(tab, name & searchKey, getCursor())
 
       var rss = await getCachedRss(key)
       if rss.cursor.len > 0:
@@ -132,28 +138,27 @@ proc createRssRouter*(cfg: Config) =
         cursor = getCursor()
 
       if list.id.len == 0:
-        resp Http404, showError(&"""List "{@"slug"}" not found""", cfg)
+        resp Http404, showError("List \"" & @"slug" & "\" not found", cfg)
 
-      let url = &"/i/lists/{list.id}/rss"
+      let url = "/i/lists/" & list.id & "/rss"
       if cursor.len > 0:
-        redirect(&"{url}?cursor={encodeUrl(cursor, false)}")
+        redirect(url & "?cursor=" & encodeUrl(cursor, false))
       else:
         redirect(url)
 
     get "/i/lists/@id/rss":
       cond cfg.enableRss
       let
+        id = @"id"
         cursor = getCursor()
-        key =
-          if cursor.len == 0: "lists:" & @"id"
-          else: &"""lists:{@"id"}:{cursor}"""
+        key = redisKey("lists", id, cursor)
 
       var rss = await getCachedRss(key)
       if rss.cursor.len > 0:
         respRss(rss, "List")
 
       let
-        list = await getCachedList(id=(@"id"))
+        list = await getCachedList(id=id)
         timeline = await getListTimeline(list.id, cursor)
       rss.cursor = timeline.bottom
       rss.feed = renderListRss(timeline.content, list, cfg)