Test stats on runtime schema create/drop

Add several test cases to check stats module behavior in case of
creating new spaces or dropping ones in runtime.

Follows up #224

Author: DifferentialOrange

test/integration/stats_test.lua

@@ -16,6 +16,7 @@ local helpers = require('test.helper')
 local space_id = 542
 local space_name = 'customers'
 local unknown_space_name = 'non_existing_space'
+local new_space_name = 'newspace'
 
 local function before_all(g)
     g.cluster = helpers.Cluster:new({
@@ -60,6 +61,7 @@ local function before_each(g)
     g.router:eval("crud = require('crud')")
     enable_stats(g)
     helpers.truncate_space_on_cluster(g.cluster, space_name)
+    helpers.drop_space_on_cluster(g.cluster, new_space_name)
 end
 
 local function get_metrics(g)
@@ -988,3 +990,74 @@ group_metrics.test_stats_changed_in_metrics_registry_after_module_reload = funct
 
     check_updated_per_call(g)
 end
+
+
+local function create_new_space(g)
+    helpers.call_on_storages(g.cluster, function(server)
+        server.net_box:eval([[
+            local space_name = ...
+            if not box.cfg.read_only then
+                local sp = box.schema.space.create(space_name, { format = {
+                    {name = 'id', type = 'unsigned'},
+                    {name = 'bucket_id', type = 'unsigned'},
+                }})
+
+                sp:create_index('pk', {
+                    parts = { {field = 'id'} },
+                })
+
+                sp:create_index('bucket_id', {
+                    parts = { {field = 'bucket_id'} },
+                    unique = false,
+                })
+            end
+        ]], { new_space_name })
+    end)
+end
+
+pgroup.test_spaces_created_in_runtime_supported_with_stats = function(g)
+    local op = 'insert'
+    local stats_before = get_stats(g, new_space_name)
+    local op_before = get_before_stats(stats_before, op)
+
+    create_new_space(g)
+
+    local _, err = g.router:call('crud.insert', { new_space_name, { 1, box.NULL }})
+    t.assert_equals(err, nil)
+
+    local stats_after = get_stats(g, new_space_name)
+    local op_after = stats_after[op]
+    t.assert_type(op_after, 'table', "'insert' stats found for new space")
+    t.assert_type(op_after.ok, 'table', "success 'insert' stats found for new space")
+    t.assert_equals(op_after.ok.count - op_before.ok.count, 1,
+        "Success requests count incremented for new space")
+end
+
+
+pgroup.before_test(
+    'test_spaces_dropped_in_runtime_supported_with_stats',
+    function(g)
+        create_new_space(g)
+
+        local _, err = g.router:call('crud.insert', { new_space_name, { 1, box.NULL }})
+        t.assert_equals(err, nil)
+    end)
+
+pgroup.test_spaces_dropped_in_runtime_supported_with_stats = function(g)
+    local op = 'insert'
+    local stats_before = get_stats(g, new_space_name)
+    local op_before = get_before_stats(stats_before, op)
+    t.assert_type(op_before, 'table', "'insert' stats found for new space")
+
+    helpers.drop_space_on_cluster(g.cluster, new_space_name)
+
+    local _, err = g.router:call('crud.insert', { new_space_name, { 2, box.NULL }})
+    t.assert_not_equals(err, nil, "Should trigger 'space not found' error")
+
+    local stats_after = get_stats(g, new_space_name)
+    local op_after = stats_after[op]
+    t.assert_type(op_after, 'table', "'insert' stats found for dropped new space")
+    t.assert_type(op_after.error, 'table', "error 'insert' stats found for dropped new space")
+    t.assert_equals(op_after.error.count - op_before.error.count, 1,
+        "Error requests count incremented since space was known to registry before drop")
+end