refactor: added standard nim logging library

src/redis_cache.nim

@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: AGPL-3.0-only
-import asyncdispatch, times, strformat, strutils, tables, hashes
+import asyncdispatch, times, strformat, strutils, tables, hashes, logging
 import redis, redpool, flatty, supersnappy
 
 import types, api
@@ -59,8 +59,7 @@ proc initRedisPool*(cfg: Config) {.async.} =
       await r.configSet("hash-max-ziplist-entries", "1000")
 
   except OSError:
-    stdout.write "Failed to connect to Redis.\n"
-    stdout.flushFile
+    fatal "Failed to connect to Redis."
     quit(1)
 
 template uidKey(name: string): string = "pid:" & $(hash(name) div 1_000_000)
@@ -112,7 +111,7 @@ template deserialize(data, T) =
   try:
     result = fromFlatty(uncompress(data), T)
   except:
-    echo "Decompression failed($#): '$#'" % [astToStr(T), data]
+    error "Decompression failed($#): '$#'" % [astToStr(T), data]
 
 proc getUserId*(username: string): Future[string] {.async.} =
   let name = toLower(username)
@@ -189,6 +188,6 @@ proc getCachedRss*(key: string): Future[Rss] {.async.} =
         let feed = await r.hGet(k, "rss")
         if feed.len > 0 and feed != redisNil:
           try: result.feed = uncompress feed
-          except: echo "Decompressing RSS failed: ", feed
+          except: error "Decompressing RSS failed: ", feed
     else:
       result.cursor.setLen 0