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-module(http_ffi).
-export([serve/4, response_default_headers/0]).
serve(Host, Port, OnStart, OnPortTaken) ->
{ok, Pattern} = re:compile("name *= *\"(?<Name>.+)\""),
{ok, Toml} = file:read_file("gleam.toml"),
{match, [Name]} = re:run(Toml, Pattern, [{capture, all_names, binary}]),
Html =
<<
"<!DOCTYPE html>\n"
"<html lang=\"en\">\n"
"<head>\n"
" <meta charset=\"UTF-8\">\n"
" <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n"
" <title>Lustre preview server</title>\n"
"\n"
" <script type=\"module\">\n"
" import { main } from './",
Name/binary,
"/",
Name/binary,
".mjs'\n"
"\n"
" document.addEventListener(\"DOMContentLoaded\", () => {\n"
" main();\n"
" });\n"
" </script>\n"
"</head>\n"
"<body>\n"
" <div data-lustre-app></div>\n"
"</body>\n"
"</html>"
>>,
file:write_file("build/dev/javascript/index.html", Html),
AbsPath =
string:trim(
filename:absname("build/dev/javascript"), trailing, "/."
),
inets:start(),
Address = {127, 0, 0, 1},
ActualPort =
case port_available(Port) of
true ->
Port;
false ->
OnPortTaken(Port),
first_available_port(Port + 1)
end,
{ok, Pid} =
httpd:start_service([
{bind_address, Address},
{document_root, AbsPath},
{server_root, AbsPath},
{directory_index, ["index.html"]},
{server_name, binary_to_list(Host)},
{port, ActualPort},
{default_type, "text/html"},
{mime_types, mime_types()},
{customize, ?MODULE},
{modules, [mod_alias, mod_dir, mod_get]}
]),
OnStart(ActualPort),
receive
{From, shutdown} ->
ok = httpd:stop_service(Pid),
From ! done
end.
port_available(Port) ->
case gen_tcp:listen(Port, []) of
{ok, Sock} ->
ok = gen_tcp:close(Sock),
true;
_ ->
false
end.
first_available_port(Port) ->
case port_available(Port) of
true -> Port;
false -> first_available_port(Port + 1)
end.
mime_types() ->
[
{"html", "text/html"},
{"htm", "text/html"},
{"js", "text/javascript"},
{"mjs", "text/javascript"},
{"css", "text/css"},
{"gif", "image/gif"},
{"jpg", "image/jpeg"},
{"jpeg", "image/jpeg"},
{"png", "image/png"}
].
response_default_headers() ->
[
{"cache-control", "no-store, no-cache, must-revalidate, private"},
{"pragma", "no-cache"}
].
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