feat(wasm): add support for wasmtime cache

kong-3.7.0-0.rockspec

@@ -109,6 +109,7 @@ build = {
  ["kong.templates.nginx_kong_inject"] = "kong/templates/nginx_kong_inject.lua",
  ["kong.templates.nginx_kong_stream_inject"] = "kong/templates/nginx_kong_stream_inject.lua",
  ["kong.templates.kong_yml"] = "kong/templates/kong_yml.lua",
+ ["kong.templates.wasmtime_cache_config"] = "kong/templates/wasmtime_cache_config.lua",
 
  ["kong.resty.dns.client"] = "kong/resty/dns/client.lua",
  ["kong.resty.dns.utils"] = "kong/resty/dns/utils.lua",

kong/cmd/utils/prefix_handler.lua

@@ -5,6 +5,7 @@ local kong_nginx_stream_template = require "kong.templates.nginx_kong_stream"
 local nginx_main_inject_template = require "kong.templates.nginx_inject"
 local nginx_http_inject_template = require "kong.templates.nginx_kong_inject"
 local nginx_stream_inject_template = require "kong.templates.nginx_kong_stream_inject"
+local wasmtime_cache_template = require "kong.templates.wasmtime_cache_config"
 local system_constants = require "lua_system_constants"
 local process_secrets = require "kong.cmd.utils.process_secrets"
 local openssl_bignum = require "resty.openssl.bn"
@@ -419,6 +420,10 @@ local function compile_nginx_conf(kong_config, template)
  return compile_conf(kong_config, template)
 end
 
+local function compile_wasmtime_cache_conf(kong_config)
+ return compile_conf(kong_config, wasmtime_cache_template)
+end
+
 local function prepare_prefixed_interface_dir(usr_path, interface_dir, kong_config)
  local usr_interface_path = usr_path .. "/" .. interface_dir
  local interface_path = kong_config.prefix .. "/" .. interface_dir
@@ -673,6 +678,23 @@ local function prepare_prefix(kong_config, nginx_custom_template_path, skip_writ
  return true
  end
 
+ if kong_config.wasm then
+ if kong_config.wasmtime_cache_directory then
+ local ok, err = makepath(kong_config.wasmtime_cache_directory)
+ if not ok then
+ return nil, err
+ end
+ end
+
+ if kong_config.wasmtime_cache_config_file then
+ local wasmtime_conf, err = compile_wasmtime_cache_conf(kong_config)
+ if not wasmtime_conf then
+ return nil, err
+ end
+ pl_file.write(kong_config.wasmtime_cache_config_file, wasmtime_conf)
+ end
+ end
+
  -- compile Nginx configurations
  local nginx_template
  if nginx_custom_template_path then

kong/conf_loader/init.lua

@@ -646,6 +646,10 @@ local function load(path, custom_conf, opts)
  -- TODO: as a temporary compatibility fix, we are forcing it to 'off'.
  add_wasm_directive("nginx_http_proxy_wasm_lua_resolver", "off")
 
+ -- configure wasmtime module cache
+ conf.wasmtime_cache_directory = pl_path.join(conf.prefix, ".wasmtime_cache")
+ conf.wasmtime_cache_config_file = pl_path.join(conf.prefix, ".wasmtime_config.toml")
+
  -- wasm vm properties are inherited from previously set directives
  if conf.lua_ssl_trusted_certificate and #conf.lua_ssl_trusted_certificate >= 1 then
  add_wasm_directive("tls_trusted_certificate", conf.lua_ssl_trusted_certificate[1], wasm_main_prefix)

kong/templates/nginx.lua

@@ -38,13 +38,12 @@ wasm {
 > end
 > end
 
-> if #nginx_wasm_wasmtime_directives > 0 then
  wasmtime {
+ cache_config ${{WASMTIME_CACHE_CONFIG_FILE}};
 > for _, el in ipairs(nginx_wasm_wasmtime_directives) do
  flag $(el.name) $(el.value);
 > end
  }
-> end -- wasmtime
 
 > if #nginx_wasm_v8_directives > 0 then
  v8 {

kong/templates/wasmtime_cache_config.lua

@@ -0,0 +1,5 @@
+return [[
+[cache]
+enabled = true
+directory = "${{WASMTIME_CACHE_DIRECTORY}}"
+]]

spec/fixtures/custom_nginx.template

@@ -48,13 +48,12 @@ wasm {
 > end
 > end
 
-> if #nginx_wasm_wasmtime_directives > 0 then
  wasmtime {
+ cache_config ${{WASMTIME_CACHE_CONFIG_FILE}};
 > for _, el in ipairs(nginx_wasm_wasmtime_directives) do
  flag $(el.name) $(el.value);
 > end
  }
-> end -- wasmtime
 
 > if #nginx_wasm_v8_directives > 0 then
  v8 {