roles: introduce router configuration

This patch introduces `roles.crud-router` role configuration through
`roles_cfg`, similar to existing Cartridge clusterwide configuration
support. For now, storages don't have any configuration, so they remain
unchanged.

After this patch, Tarantool 3 roles have all features supported in
Cartridge roles.

Closes #415

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 * Asynchronous bootstrap support for storages (#412).
 * Tarantool 3 roles for setting up crud routers and storages (#415).
+* Ability to configure crud through Tarantool 3 roles configuration (#415).
 
 ### Changed
 * Explicitly forbid datetime interval conditions (#373).

README.md

@@ -2102,6 +2102,21 @@ issues.
 5.  Start the application cluster. You can check whether asynchronous bootstrap
     had finished through `crud.storage_info()` calls on router.
 
+6.  Configure the statistics with roles configuration
+    (see `crud.cfg` options in [statistics](#statistics) section):
+    ```yaml
+    roles:
+      - roles.crud-router
+    roles_cfg:
+      roles.crud-router:
+        stats: true
+        stats_driver: metrics
+        stats_quantiles: false
+        stats_quantile_tolerated_error: 0.001
+        stats_quantile_age_buckets_count: 5
+        stats_quantile_max_age_time: 180
+    ```
+
 Now your cluster contains storages that are configured to be used for
 CRUD-operations.
 You can simply call CRUD functions on the router to insert, select, and update

roles/crud-router.lua

@@ -3,6 +3,7 @@ local errors = require('errors')
 local crud = require('crud')
 local common_role_utils = require('crud.common.roles')
 local common_utils = require('crud.common.utils')
+local stats = require('crud.stats')
 
 local TarantoolRoleConfigurationError = errors.new_class('TarantoolRoleConfigurationError')
 
@@ -12,15 +13,71 @@ TarantoolRoleConfigurationError:assert(
     ('Tarantool 3 role is not supported for Tarantool %s, use 3.0.2 or newer'):format(tarantool_version)
 )
 
-local function validate()
+
+local function validate_enabled_on_sharding_router()
     TarantoolRoleConfigurationError:assert(
         common_role_utils.is_sharding_role_enabled('router'),
         'Instance must be a sharding router to enable roles.crud-router'
     )
 end
 
-local function apply()
+local cfg_types = {
+    stats = 'boolean',
+    stats_driver = 'string',
+    stats_quantiles = 'boolean',
+    stats_quantile_tolerated_error = 'number',
+    stats_quantile_age_buckets_count = 'number',
+    stats_quantile_max_age_time = 'number',
+}
+
+local cfg_values = {
+    stats_driver = function(value)
+        TarantoolRoleConfigurationError:assert(
+            stats.is_driver_supported(value),
+            'Invalid "stats_driver" field value: %q is not supported',
+            value
+        )
+    end,
+}
+
+local function validate_roles_cfg(roles_cfg)
+    if roles_cfg == nil then
+        return
+    end
+
+    TarantoolRoleConfigurationError:assert(
+        type(roles_cfg) == 'table',
+        'roles_cfg must be a table'
+    )
+
+    for name, value in pairs(roles_cfg) do
+        TarantoolRoleConfigurationError:assert(
+            cfg_types[name] ~= nil,
+            'Unknown field %q', name
+        )
+
+        TarantoolRoleConfigurationError:assert(
+            type(value) == cfg_types[name],
+            'Invalid %q field type: expected %s, got %s',
+            name, cfg_types[name], type(value)
+        )
+
+        if cfg_values[name] ~= nil then
+            cfg_values[name](value)
+        end
+    end
+end
+
+local function validate(roles_cfg)
+    validate_enabled_on_sharding_router()
+
+    validate_roles_cfg(roles_cfg)
+end
+
+local function apply(roles_cfg)
     crud.init_router()
+
+    crud.cfg(roles_cfg)
 end
 
 local function stop()

test/helper.lua

@@ -1468,4 +1468,8 @@ function helpers.skip_if_tarantool3_crud_roles_unsupported()
         ("Tarantool %s does not support crud roles"):format(version))
 end
 
+function helpers.skip_not_config_backend(backend)
+    t.skip_if(backend ~= helpers.backend.CONFIG, "The test is for Tarantool 3 with config only")
+end
+
 return helpers

test/integration/cfg_test.lua

@@ -180,32 +180,59 @@ end
 
 local role_cfg_error_cases = {
     wrong_section_type = {
-        args = {crud = 'enabled'},
-        err = 'Configuration \\\"crud\\\" section must be a table',
+        args = 'enabled',
+        err_cartridge = 'Configuration \\\"crud\\\" section must be a table',
+        err_tarantool3 = 'Wrong config for role roles.crud-router: TarantoolRoleConfigurationError: '..
+                         'roles_cfg must be a table',
     },
     wrong_structure = {
-        args = {crud = {crud = {stats = true}}},
-        err = '\\\"crud\\\" section is already presented as a name of \\\"crud.yml\\\", ' ..
-              'do not use it as a top-level section name',
+        args = {crud = {stats = true}},
+        err_cartridge = '\\\"crud\\\" section is already presented as a name of \\\"crud.yml\\\", ' ..
+                        'do not use it as a top-level section name',
+        err_tarantool3 = 'Wrong config for role roles.crud-router: TarantoolRoleConfigurationError: '..
+                         'Unknown field \"crud\"',
     },
     wrong_type = {
-        args = {crud = {stats = 'enabled'}},
-        err = 'Invalid crud configuration field \\\"stats\\\" type: expected boolean, got string',
+        args = {stats = 'enabled'},
+        err_cartridge = 'Invalid crud configuration field \\\"stats\\\" type: expected boolean, got string',
+        err_tarantool3 = 'Wrong config for role roles.crud-router: TarantoolRoleConfigurationError: '..
+                         'Invalid \"stats\" field type: expected boolean, got string',
     },
     wrong_value = {
-        args = {crud = {stats_driver = 'prometheus'}},
-        err = 'Invalid crud configuration field \\\"stats_driver\\\" value: \\\"prometheus\\\" is not supported',
+        args = {stats_driver = 'prometheus'},
+        err_cartridge = 'Invalid crud configuration field \\\"stats_driver\\\" value: '..
+                        '\\\"prometheus\\\" is not supported',
+        err_tarantool3 = 'Wrong config for role roles.crud-router: TarantoolRoleConfigurationError: '..
+                         'Invalid \"stats_driver\" field value: \"prometheus\" is not supported',
     }
 }
 
 for name, case in pairs(role_cfg_error_cases) do
-    group['test_role_cfg_' .. name] = function(g)
+    group['test_cartridge_role_cfg_' .. name] = function(g)
         helpers.skip_not_cartridge_backend(g.params.backend)
         local success, error = pcall(function()
-            g.router:upload_config(case.args)
+            g.router:upload_config({
+                crud = case.args,
+            })
         end)
 
         t.assert_equals(success, false)
-        t.assert_str_contains(error.response.body, case.err)
+        t.assert_str_contains(error.response.body, case.err_cartridge)
+    end
+
+    group['test_tarantool3_role_cfg_' .. name] = function(g)
+        helpers.skip_not_config_backend(g.params.backend)
+        local success, error = pcall(function()
+            local cfg = g.cluster:cfg()
+
+            cfg.groups['routers'].roles_cfg = {
+                ['roles.crud-router'] = case.args,
+            }
+
+            g.cluster:reload_config(cfg)
+        end)
+
+        t.assert_equals(success, false)
+        t.assert_str_contains(tostring(error), case.err_tarantool3)
     end
 end

test/integration/stats_test.lua

@@ -9,15 +9,19 @@ local matrix = helpers.backend_matrix({
     { way = 'call', args = { driver = 'metrics', quantiles = false }},
     { way = 'call', args = { driver = 'metrics', quantiles = true }},
 })
-table.insert(matrix, {backend = helpers.backend.CARTRIDGE,
-    way = 'role', args = { driver = 'local' },
-})
-table.insert(matrix, {backend = helpers.backend.CARTRIDGE,
-    way = 'role', args = { driver = 'metrics', quantiles = false },
-})
-table.insert(matrix, {backend = helpers.backend.CARTRIDGE,
-    way = 'role', args = { driver = 'metrics', quantiles = true },
-})
+
+for _, backend in ipairs({helpers.backend.CARTRIDGE, helpers.backend.CONFIG}) do
+    table.insert(matrix, {backend = backend,
+        way = 'role', args = { driver = 'local' },
+    })
+    table.insert(matrix, {backend = backend,
+        way = 'role', args = { driver = 'metrics', quantiles = false },
+    })
+    table.insert(matrix, {backend = backend,
+        way = 'role', args = { driver = 'metrics', quantiles = true },
+    })
+end
+
 local pgroup = t.group('stats_integration', matrix)
 
 matrix = helpers.backend_matrix({
@@ -57,7 +61,17 @@ local call_cfg = function(g, way, cfg)
             require('crud').cfg(...)
         ]], { cfg })
     elseif way == 'role' then
-        g.router:upload_config{crud = cfg}
+        if g.params.backend == helpers.backend.CARTRIDGE then
+            g.router:upload_config{crud = cfg}
+        elseif g.params.backend == helpers.backend.CONFIG then
+            local cluster_cfg = g.cluster:cfg()
+
+            cluster_cfg.groups['routers'].roles_cfg = {
+                ['roles.crud-router'] = cfg,
+            }
+
+            g.cluster:reload_config(cluster_cfg)
+        end
     end
 end
 

test/tarantool3_helpers/cluster.lua

@@ -297,8 +297,33 @@ function Cluster:cfg(new_config)
     return table.deepcopy(self.config)
 end
 
+local function strip_all_entries(t, name)
+    if type(t) ~= 'table' then
+        return t
+    end
+
+    t[name] = nil
+
+    for k, v in pairs(t) do
+        t[k] = strip_all_entries(v, name)
+    end
+
+    return t
+end
+
+local function check_only_roles_cfg_changed_in_groups(old_groups, new_groups)
+    old_groups = table.deepcopy(old_groups)
+    new_groups = table.deepcopy(new_groups)
+
+    local old_groups_no_roles_cfg = strip_all_entries(old_groups, 'roles_cfg')
+    local new_groups_no_roles_cfg = strip_all_entries(new_groups, 'roles_cfg')
+
+    t.assert_equals(new_groups_no_roles_cfg, old_groups_no_roles_cfg,
+        'groups reload supports only roles_cfg reload')
+end
+
 function Cluster:reload_config(new_config)
-    t.assert_equals(new_config.groups, self.config.groups, 'groups reload is not supported yet')
+    check_only_roles_cfg_changed_in_groups(self.config.groups, new_config.groups)
 
     for _, server in ipairs(self.servers) do
         write_config(self.dirs[server], new_config)