restore behavior to print config when it is refreshed

lib/action.ml

@@ -13,6 +13,16 @@ let action_error msg = raise (Action_error msg)
 let log = Log.from "action"
 
 module Action (Github_api : Api.Github) (Slack_api : Api.Slack) = struct
+  (* this should move to context.ml once rule.ml is refactored to not depend on it *)
+  let print_config ctx =
+    let cfg = Context.get_config_exn ctx in
+    let secrets = Context.get_secrets_exn ctx in
+    log#info "using prefix routing:";
+    Rule.Prefix.print_prefix_routing cfg.prefix_rules.rules;
+    log#info "using label routing:";
+    Rule.Label.print_label_routing cfg.label_rules.rules;
+    log#info "signature checking %s" (if Option.is_some secrets.gh_hook_token then "enabled" else "disabled")
+
   let partition_push cfg n =
     let default = Option.to_list cfg.prefix_rules.default_channel in
     let rules = cfg.prefix_rules.rules in
@@ -203,6 +213,7 @@ module Action (Github_api : Api.Github) (Slack_api : Api.Slack) = struct
       let repo = Github.repo_of_notification notification in
       match%lwt Github_api.get_config ~ctx ~repo with
       | Ok config ->
+        print_config ctx;
         (* can remove this wrapper once status_rules doesn't depend on Config.t *)
         ctx.config <- Some (Config.make config);
         Lwt.return @@ Ok ()

lib/rule.ml

@@ -63,6 +63,21 @@ module Prefix = struct
     |> List.filter_map ~f:match_rule
     |> List.max_elt ~compare
     |> Option.map ~f:(fun (res : prefix_rule * int) -> (fst res).channel_name)
+
+  let print_prefix_routing rules =
+    let show_match l = String.concat ~sep:" or " @@ List.map ~f:(fun s -> s ^ "*") l in
+    rules
+    |> List.iter ~f:(fun (rule : prefix_rule) ->
+         begin
+           match rule.allow, rule.ignore with
+           | None, None -> Stdio.printf "  any"
+           | None, Some [] -> Stdio.printf "  any"
+           | None, Some l -> Stdio.printf "  not %s" (show_match l)
+           | Some l, None -> Stdio.printf "  %s" (show_match l)
+           | Some l, Some [] -> Stdio.printf "  %s" (show_match l)
+           | Some l, Some i -> Stdio.printf "  %s and not %s" (show_match l) (show_match i)
+         end;
+         Stdio.printf " -> #%s\n%!" rule.channel_name)
 end
 
 module Label = struct
@@ -83,4 +98,19 @@ module Label = struct
       | Some allow_list -> if List.exists allow_list ~f:label_name_equal then Some rule.channel_name else None
     in
     rules |> List.filter_map ~f:match_rule |> List.dedup_and_sort ~compare:String.compare
+
+  let print_label_routing rules =
+    let show_match l = String.concat ~sep:" or " l in
+    rules
+    |> List.iter ~f:(fun (rule : label_rule) ->
+         begin
+           match rule.allow, rule.ignore with
+           | None, None -> Stdio.printf "  any"
+           | None, Some [] -> Stdio.printf "  any"
+           | None, Some l -> Stdio.printf "  not %s" (show_match l)
+           | Some l, None -> Stdio.printf "  %s" (show_match l)
+           | Some l, Some [] -> Stdio.printf "  %s" (show_match l)
+           | Some l, Some i -> Stdio.printf "  %s and not %s" (show_match l) (show_match i)
+         end;
+         Stdio.printf " -> #%s\n%!" rule.channel_name)
 end