roles: add tls support

Since we support TLS in this module, we need to add it into roles too.

After the patch TLS params was added. It can be configurated like the
following:

```yaml
server_name:
  listen: "localhost:3013"
  params:
    ssl_key_file: "path/to/key/file"
    ssl_cert_file: "path/to/key/file"
    ssl_ca_file: "path/to/key/file"
    ssl_ciphers: "cipher1:cipher2"
    ssl_password: "password"
    ssl_password_file: "path/to/ssl/password"
```

Closes #199

roles/httpd.lua

@@ -72,14 +72,32 @@ local function parse_listen(listen)
     return host, port, nil
 end
 
+-- get_params returns table with set params from config to
+-- pass it into new() func.
+local function get_params(params)
+    if params ~= nil then
+        return {
+            ssl_cert_file = params.ssl_cert_file,
+            ssl_key_file = params.ssl_key_file,
+            ssl_password = params.ssl_password,
+            ssl_password_file = params.ssl_password_file,
+            ssl_ca_file = params.ssl_ca_file,
+            ssl_ciphers = params.ssl_ciphers,
+        }
+    end
+end
+
 local function apply_http(name, node)
     local host, port, err = parse_listen(node.listen)
     if err ~= nil then
         error("failed to parse URI: " .. err)
     end
 
+    local params = get_params(node.params)
+
     if servers[name] == nil then
-        local httpd = http_server.new(host, port)
+        local httpd = http_server.new(host, port, params)
+
         httpd:start()
         servers[name] = {
             httpd = httpd,

test/integration/httpd_role_test.lua

@@ -3,10 +3,18 @@ local treegen = require('luatest.treegen')
 local server = require('luatest.server')
 local fun = require('fun')
 local yaml = require('yaml')
+local fio = require('fio')
+local http_client = require('http.client').new()
+
 
 local helpers = require('test.helpers')
 
-local g = t.group()
+local g = t.group(nil, {
+    { use_tls = false },
+    { use_tls = true },
+})
+
+local ssl_data_dir = fio.abspath(fio.pathjoin(helpers.get_testdir_path(), "ssl_data"))
 
 local config = {
     credentials = {
@@ -55,29 +63,55 @@ local config = {
     },
 }
 
-g.before_each(function()
+local tls_config = table.deepcopy(config)
+tls_config.groups['group-001'].replicasets['replicaset-001'].roles_cfg['roles.httpd'].default.params = {
+    ssl_cert_file = fio.pathjoin(ssl_data_dir, 'server.crt'),
+    ssl_key_file = fio.pathjoin(ssl_data_dir, 'server.enc.key'),
+    ssl_password_file = fio.pathjoin(ssl_data_dir, 'passwords'),
+}
+
+g.before_each(function(cg)
     helpers.skip_if_not_tarantool3()
 
     local dir = treegen.prepare_directory({}, {})
 
+    local cfg = config
+    if cg.params.use_tls then
+        cfg = tls_config
+    end
+
     local config_file = treegen.write_file(dir, 'config.yaml',
-        yaml.encode(config))
+        yaml.encode(cfg))
     local opts = {config_file = config_file, chdir = dir}
-    g.server = server:new(fun.chain(opts, {alias = 'instance-001'}):tomap())
-    helpers.update_lua_env_variables(g.server)
+    cg.server = server:new(fun.chain(opts, {alias = 'instance-001'}):tomap())
+    helpers.update_lua_env_variables(cg.server)
 
-    g.server:start()
+    cg.server:start()
 end)
 
-g.after_each(function()
-    g.server:stop()
+g.after_each(function(cg)
+    helpers.teardown(cg.server)
 end)
 
-g.test_httpd_role_usage = function()
-    t.assert_equals(g.server:eval(
+g.test_httpd_role_usage = function(cg)
+    if cg.params.use_tls then
+        local resp = http_client:get('https://localhost:13000/ping', {
+            ca_file = fio.pathjoin(ssl_data_dir, 'ca.crt')
+        })
+        t.assert_equals(resp.status, 200, 'response not 200')
+        t.assert_equals(resp.body, 'pong')
+    end
+
+    -- We can use https only for one endpoind due to we haven't publish separate
+    -- certificates for it.
+    local resp = http_client:get('http://localhost:13001/ping')
+    t.assert_equals(resp.status, 200, 'response not 200')
+    t.assert_equals(resp.body, 'pong')
+
+    t.assert_equals(cg.server:eval(
         'return require("test.mocks.mock_role").get_server_port(1)'
     ), 13000)
-    t.assert_equals(g.server:eval(
+    t.assert_equals(cg.server:eval(
         'return require("test.mocks.mock_role").get_server_port(2)'
     ), 13001)
 end

test/mocks/mock_role.lua

@@ -7,6 +7,12 @@ M.validate = function() end
 M.apply = function(conf)
     for _, server in pairs(conf) do
         servers[server.id] = require('roles.httpd').get_server(server.name)
+
+        servers[server.id]:route({
+            path = '/ping',
+        }, function(tx)
+            return tx:render({text = 'pong'})
+        end)
     end
 end