use shared constant for MAX_PAGE_SIZE in api and lavinmqctl

src/lavinmq/http/constants.cr

@@ -1,5 +1,6 @@
 module LavinMQ
   module HTTP
     INTERNAL_UNIX_SOCKET = "/tmp/lavinmqctl.sock"
+    MAX_PAGE_SIZE = 10_000
   end
 end

src/lavinmq/http/controller.cr

@@ -32,15 +32,13 @@ module LavinMQ
         value[:name]? || value["name"]?
       end
 
-      MAX_PAGE_SIZE = 10_000
-
       private def page(context, iterator : Iterator(SortableJSON))
         params = context.request.query_params
         page = params["page"]?.try(&.to_i) || 1
         page_size = params["page_size"]?.try(&.to_i) || 100
         if page_size > MAX_PAGE_SIZE
           context.response.status_code = 413
-          {error: "payload_too_large", reason: "Max allowed page_size 10000"}.to_json(context.response)
+          {error: "payload_too_large", reason: "Max allowed page_size #{MAX_PAGE_SIZE}"}.to_json(context.response)
           return context
         end
         iterator = iterator.map do |i|

src/lavinmqctl.cr

@@ -306,10 +306,8 @@ class LavinMQCtl
     URI.encode_www_form(@options["vhost"])
   end
 
-  MAX_PAGE_SIZE = 10_000
-
-  private def get(url, page = 1, items = [] of JSON::Any)
-    resp = http.get("#{url}?page=#{page}&page_size=#{MAX_PAGE_SIZE}", @headers)
+  private def get(url, page = 1, items = Array(JSON::Any).new)
+    resp = http.get("#{url}?page=#{page}&page_size=#{LavinMQ::HTTP::MAX_PAGE_SIZE}", @headers)
     handle_response(resp, 200)
     if data = JSON.parse(resp.body).as_h?
       items += data["items"].as_a