Test on OTP-26, drop pre-OTP-23; OTP-27 not compatible yet; fix dialyzer

.github/workflows/ci.yml

@@ -19,15 +19,14 @@ jobs:
       matrix:
         os:
           - "ubuntu-20.04"
-        rebar3: ["3.18.0"]
+        rebar3: ["3.20.0"]
         otp:
-          - "25.1"
+          - "26.2"
+          - "25.3"
           - "24.3"
-          - "23.3"
-          - "22.3"
         include:
-          - otp: "21.3"
-            rebar3: "3.15.2"
+          - otp: "23.3"
+            rebar3: "3.18.0"
             os: "ubuntu-20.04"
     env:
       SHELL: /bin/sh            # needed for erlexec

src/mtp_codec.erl

@@ -16,7 +16,7 @@
          try_decode_packet/2,
          encode_packet/2,
          fold_packets/4, fold_packets_if/4]).
--export_type([codec/0]).
+-export_type([codec/0, packet_codec/0]).
 
 -type state() :: any().
 -type crypto_codec() :: mtp_aes_cbc

src/mtp_config.erl

@@ -26,7 +26,7 @@
 %% gen_server callbacks
 -export([init/1, handle_call/3, handle_cast/2, handle_info/2,
          terminate/2, code_change/3]).
--export_type([netloc_v4v6/0]).
+-export_type([dc_id/0, netloc/0, netloc_v4v6/0]).
 
 -type dc_id() :: integer().
 -type netloc() :: {inet:ip4_address(), inet:port_number()}.

src/mtp_down_conn_sup.erl

@@ -20,7 +20,7 @@
 start_link() ->
     supervisor:start_link({local, ?SERVER}, ?MODULE, []).
 
--spec start_conn(pid(), mtp_conf:dc_id()) -> {ok, pid()}.
+-spec start_conn(pid(), mtp_config:dc_id()) -> {ok, pid()}.
 start_conn(Pool, DcId) ->
     supervisor:start_child(?SERVER, [Pool, DcId]).
 

src/mtp_handler.erl

@@ -70,7 +70,7 @@ keys_str() ->
     [{Name, Port, hex(Secret)}
      || {Name, Port, Secret} <- application:get_env(?APP, ports, [])].
 
--spec send(pid(), mtp_rpc:packet()) -> ok.
+-spec send(pid(), {proxy_ans, pid(), binary()} | {simple_ack, pid(), binary()} | {close_ext, pid()}) -> ok.
 send(Upstream, Packet) ->
     gen_server:cast(Upstream, Packet).
 

src/mtp_policy_table.erl

@@ -22,6 +22,8 @@
 %% gen_server callbacks
 -export([init/1, handle_call/3, handle_cast/2, handle_info/2,
          terminate/2, code_change/3]).
+-export_type([sub_tab/0]).
+
 -type sub_tab() :: atom().
 -type value() :: mtp_policy:db_val().
 

src/mtp_rpc.erl

@@ -19,7 +19,7 @@
 %% Helpers
 -export([inet_pton/1,
          encode_ip_port/2]).
--export_type([codec/0]).
+-export_type([conn_id/0, packet/0, codec/0]).
 
 -dialyzer(no_improper_lists).