Merge pull request #107 from TheRusskiy/feature/change-payload-limit

ability to change payload limit

README.md

@@ -122,6 +122,14 @@ config :poxa,
         keyfile: "priv/ssl/server.key"]
 ```
 
+Optionally you can specify a payload limit. The default value is 10kb. To change it pass
+```
+PAYLOAD_LIMIT=20000
+```
+where 20000 is number of bytes.
+
+You can also specify this value via `payload_limit` in your config file (e.g. my_config.exs) as you would for other variables.
+
 ## Release
 
 This is the preferred way to deploy a Poxa server.

config/config.exs

@@ -11,4 +11,5 @@ config :poxa,
   app_secret: get_env("POXA_SECRET") || "secret",
   app_id: get_env("POXA_APP_ID") || "app_id",
   registry_adapter: get_env("POXA_REGISTRY_ADAPTER") || "gproc",
-  web_hook: get_env("WEB_HOOK") || nil
+  web_hook: get_env("WEB_HOOK") || nil,
+  payload_limit: get_env("PAYLOAD_LIMIT") || 10_000

lib/poxa/event_handler.ex

@@ -56,17 +56,19 @@ defmodule Poxa.EventHandler do
     {authorized, req, state}
   end
 
+
   @invalid_data_size_json Poison.encode!(%{error: "Data key must be smaller than 10KB"})
 
   @doc """
-  The event data can't be greater than 10KB
+  The event data can't be greater than payload_limit which defaults to 10KB
   """
   def valid_entity_length(req, %{event: event} = state) do
-    valid = byte_size(event.data) <= 10_000
+    {:ok, payload_limit} = Application.fetch_env(:poxa, :payload_limit)
+    valid = byte_size(event.data) <= payload_limit
     req = if valid do
             req
           else
-            :cowboy_req.set_resp_body(@invalid_data_size_json, req)
+            :cowboy_req.set_resp_body(invalid_data_size_json(payload_limit), req)
           end
     {valid, req, state}
   end
@@ -88,4 +90,9 @@ defmodule Poxa.EventHandler do
     req = :cowboy_req.set_resp_body("{}", req)
     {true, req, nil}
   end
+
+  @doc false
+  defp invalid_data_size_json(payload_limit) do
+    JSX.encode!(%{error: "Data key must be smaller than #{payload_limit}B"})
+  end
 end