Use in-built stats instead on helper in tests

Use in-built `crud.stats()` info instead on `storage_stat` helper
in tests to track map reduce calls.

Part of #224

test/helper.lua

@@ -332,4 +332,10 @@ function helpers.update_cache(cluster, space_name)
     ]], {space_name})
 end
 
+function helpers.get_map_reduces_stat(router_net_box)
+    return router_net_box:eval([[
+        return require('crud').stats().select.details.map_reduces_planned
+    ]])
+end
+
 return helpers

test/integration/ddl_sharding_key_test.lua

@@ -3,7 +3,6 @@ local crud = require('crud')
 local t = require('luatest')
 
 local helpers = require('test.helper')
-local storage_stat = require('test.helpers.storage_stat')
 
 local ok = pcall(require, 'ddl')
 if not ok then
@@ -34,13 +33,6 @@ pgroup.before_all(function(g)
     ]])
     t.assert_equals(type(result), 'table')
     t.assert_equals(err, nil)
-
-    helpers.call_on_storages(g.cluster, function(server)
-        server.net_box:eval([[
-            local storage_stat = require('test.helpers.storage_stat')
-            storage_stat.init_on_storage()
-        ]])
-    end)
 end)
 
 pgroup.after_all(function(g) helpers.stop_cluster(g.cluster) end)
@@ -349,45 +341,39 @@ for name, case in pairs(cases) do
     pgroup[('test_%s_wont_lead_to_map_reduce'):format(name)] = function(g)
         case.prepare_data(g, case.space_name)
 
-        local stat_a = storage_stat.collect(g.cluster)
+        local router = g.cluster:server('router').net_box
+        local map_reduces_before = helpers.get_map_reduces_stat(router)
 
-        local result, err = g.cluster.main_server.net_box:call('crud.select', {
+        local result, err = router:call('crud.select', {
             case.space_name, case.conditions
         })
         t.assert_equals(err, nil)
         t.assert_not_equals(result, nil)
         t.assert_equals(#result.rows, 1)
 
-        local stat_b = storage_stat.collect(g.cluster)
-
-        -- Check a number of select() requests made by CRUD on cluster's storages
-        -- after calling select() on a router. Make sure only a single storage has
-        -- a single select() request. Otherwise we lead to map-reduce.
-        local stats = storage_stat.diff(stat_b, stat_a)
-        t.assert_equals(storage_stat.total(stats), 1, 'Select request was not a map reduce')
+        local map_reduces_after = helpers.get_map_reduces_stat(router)
+        local diff = map_reduces_after - map_reduces_before
+        t.assert_equals(diff, 0, 'Select request was not a map reduce')
     end
 end
 
 pgroup.test_select_for_part_of_sharding_key_will_lead_to_map_reduce = function(g)
     local space_name = 'customers_name_age_key_different_indexes'
     prepare_data_name_age_sharding_key(g, space_name)
 
-    local stat_a = storage_stat.collect(g.cluster)
+    local router = g.cluster:server('router').net_box
+    local map_reduces_before = helpers.get_map_reduces_stat(router)
 
-    local result, err = g.cluster.main_server.net_box:call('crud.select', {
+    local result, err = router:call('crud.select', {
         space_name, {{'==', 'age', 58}},
     })
     t.assert_equals(err, nil)
     t.assert_not_equals(result, nil)
     t.assert_equals(#result.rows, 1)
 
-    local stat_b = storage_stat.collect(g.cluster)
-
-    -- Check a number of select() requests made by CRUD on cluster's storages
-    -- after calling select() on a router. Make sure it was a map-reduce
-    -- since we do not have sharding key values in conditions.
-    local stats = storage_stat.diff(stat_b, stat_a)
-    t.assert_equals(storage_stat.total(stats), 2, 'Select request was a map reduce')
+    local map_reduces_after = helpers.get_map_reduces_stat(router)
+    local diff = map_reduces_after - map_reduces_before
+    t.assert_equals(diff, 1, 'Select request was a map reduce')
 end
 
 pgroup.test_select_secondary_idx = function(g)

test/integration/pairs_test.lua

@@ -5,7 +5,6 @@ local t = require('luatest')
 local crud_utils = require('crud.common.utils')
 
 local helpers = require('test.helper')
-local storage_stat = require('test.helpers.storage_stat')
 
 local pgroup = t.group('pairs', {
     {engine = 'memtx'},
@@ -26,13 +25,6 @@ pgroup.before_all(function(g)
     g.cluster:start()
 
     g.space_format = g.cluster.servers[2].net_box.space.customers:format()
-
-    helpers.call_on_storages(g.cluster, function(server)
-        server.net_box:eval([[
-            local storage_stat = require('test.helpers.storage_stat')
-            storage_stat.init_on_storage()
-        ]])
-    end)
 end)
 
 pgroup.after_all(function(g) helpers.stop_cluster(g.cluster) end)
@@ -842,10 +834,11 @@ pgroup.test_pairs_no_map_reduce = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local stat_a = storage_stat.collect(g.cluster)
+    local router = g.cluster:server('router').net_box
+    local map_reduces_before = helpers.get_map_reduces_stat(router)
 
     -- Case: no conditions, just bucket id.
-    local rows = g.cluster.main_server.net_box:eval([[
+    local rows = router:eval([[
         local crud = require('crud')
 
         return crud.pairs(...):totable()
@@ -858,15 +851,9 @@ pgroup.test_pairs_no_map_reduce = function(g)
         {3, 2804, 'David', 'Smith', 33, 'Los Angeles'},
     })
 
-    local stat_b = storage_stat.collect(g.cluster)
-    t.assert_equals(storage_stat.diff(stat_b, stat_a), {
-        ['s-1'] = {
-            select_requests = 1,
-        },
-        ['s-2'] = {
-            select_requests = 0,
-        },
-    })
+    local map_reduces_after_1 = helpers.get_map_reduces_stat(router)
+    local diff_1 = map_reduces_after_1 - map_reduces_before
+    t.assert_equals(diff_1, 0, 'Select request was not a map reduce')
 
     -- Case: EQ on secondary index, which is not in the sharding
     -- index (primary index in the case).
@@ -883,13 +870,7 @@ pgroup.test_pairs_no_map_reduce = function(g)
         {4, 1161, 'William', 'White', 81, 'Chicago'},
     })
 
-    local stat_c = storage_stat.collect(g.cluster)
-    t.assert_equals(storage_stat.diff(stat_c, stat_b), {
-        ['s-1'] = {
-            select_requests = 0,
-        },
-        ['s-2'] = {
-            select_requests = 1,
-        },
-    })
+    local map_reduces_after_2 = helpers.get_map_reduces_stat(router)
+    local diff_2 = map_reduces_after_2 - map_reduces_after_1
+    t.assert_equals(diff_2, 0, 'Select request was not a map reduce')
 end

test/integration/select_test.lua

@@ -6,7 +6,6 @@ local crud = require('crud')
 local crud_utils = require('crud.common.utils')
 
 local helpers = require('test.helper')
-local storage_stat = require('test.helpers.storage_stat')
 
 local pgroup = t.group('select', {
     {engine = 'memtx'},
@@ -27,13 +26,6 @@ pgroup.before_all(function(g)
     g.cluster:start()
 
     g.space_format = g.cluster.servers[2].net_box.space.customers:format()
-
-    helpers.call_on_storages(g.cluster, function(server)
-        server.net_box:eval([[
-            local storage_stat = require('test.helpers.storage_stat')
-            storage_stat.init_on_storage()
-        ]])
-    end)
 end)
 
 pgroup.after_all(function(g) helpers.stop_cluster(g.cluster) end)
@@ -1615,7 +1607,8 @@ pgroup.test_select_no_map_reduce = function(g)
 
     table.sort(customers, function(obj1, obj2) return obj1.id < obj2.id end)
 
-    local stat_a = storage_stat.collect(g.cluster)
+    local router = g.cluster:server('router').net_box
+    local map_reduces_before = helpers.get_map_reduces_stat(router)
 
     -- Case: no conditions, just bucket id.
     local result, err = g.cluster.main_server.net_box:call('crud.select', {
@@ -1628,15 +1621,9 @@ pgroup.test_select_no_map_reduce = function(g)
         {3, 2804, 'David', 'Smith', 33, 'Los Angeles'},
     })
 
-    local stat_b = storage_stat.collect(g.cluster)
-    t.assert_equals(storage_stat.diff(stat_b, stat_a), {
-        ['s-1'] = {
-            select_requests = 1,
-        },
-        ['s-2'] = {
-            select_requests = 0,
-        },
-    })
+    local map_reduces_after_1 = helpers.get_map_reduces_stat(router)
+    local diff_1 = map_reduces_after_1 - map_reduces_before
+    t.assert_equals(diff_1, 0, 'Select request was not a map reduce')
 
     -- Case: EQ on secondary index, which is not in the sharding
     -- index (primary index in the case).
@@ -1650,13 +1637,7 @@ pgroup.test_select_no_map_reduce = function(g)
         {4, 1161, 'William', 'White', 81, 'Chicago'},
     })
 
-    local stat_c = storage_stat.collect(g.cluster)
-    t.assert_equals(storage_stat.diff(stat_c, stat_b), {
-        ['s-1'] = {
-            select_requests = 0,
-        },
-        ['s-2'] = {
-            select_requests = 1,
-        },
-    })
+    local map_reduces_after_2 = helpers.get_map_reduces_stat(router)
+    local diff_2 = map_reduces_after_2 - map_reduces_after_1
+    t.assert_equals(diff_2, 0, 'Select request was not a map reduce')
 end