mirror of https://github.com/grafana/grafana
Alerting: Extract alert rule diff logic into separate file with exported API (#53083)
* Refactor diff logic into separate file with exported API * Fix linter complaintpull/53085/head
Alexander Weaver
3 years ago
committed by
GitHub
parent
d5c80a2411
commit
c50cbea0bb
@ -0,0 +1,165 @@ |
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package store |
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|
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import ( |
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"context" |
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"fmt" |
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"github.com/grafana/grafana/pkg/services/ngalert/models" |
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"github.com/grafana/grafana/pkg/util/cmputil" |
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) |
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// AlertRuleFieldsToIgnoreInDiff contains fields that are ignored when calculating the RuleDelta.Diff.
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var AlertRuleFieldsToIgnoreInDiff = [...]string{"ID", "Version", "Updated"} |
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type RuleDelta struct { |
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Existing *models.AlertRule |
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New *models.AlertRule |
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Diff cmputil.DiffReport |
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} |
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type GroupDelta struct { |
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GroupKey models.AlertRuleGroupKey |
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// AffectedGroups contains all rules of all groups that are affected by these changes.
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// For example, during moving a rule from one group to another this map will contain all rules from two groups
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AffectedGroups map[models.AlertRuleGroupKey]models.RulesGroup |
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New []*models.AlertRule |
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Update []RuleDelta |
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Delete []*models.AlertRule |
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} |
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func (c *GroupDelta) IsEmpty() bool { |
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return len(c.Update)+len(c.New)+len(c.Delete) == 0 |
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} |
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type RuleReader interface { |
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ListAlertRules(ctx context.Context, query *models.ListAlertRulesQuery) error |
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GetAlertRulesGroupByRuleUID(ctx context.Context, query *models.GetAlertRulesGroupByRuleUIDQuery) error |
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} |
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// CalculateChanges calculates the difference between rules in the group in the database and the submitted rules. If a submitted rule has UID it tries to find it in the database (in other groups).
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// returns a list of rules that need to be added, updated and deleted. Deleted considered rules in the database that belong to the group but do not exist in the list of submitted rules.
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func CalculateChanges(ctx context.Context, ruleReader RuleReader, groupKey models.AlertRuleGroupKey, submittedRules []*models.AlertRule) (*GroupDelta, error) { |
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affectedGroups := make(map[models.AlertRuleGroupKey]models.RulesGroup) |
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q := &models.ListAlertRulesQuery{ |
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OrgID: groupKey.OrgID, |
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NamespaceUIDs: []string{groupKey.NamespaceUID}, |
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RuleGroup: groupKey.RuleGroup, |
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} |
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if err := ruleReader.ListAlertRules(ctx, q); err != nil { |
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return nil, fmt.Errorf("failed to query database for rules in the group %s: %w", groupKey, err) |
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} |
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existingGroupRules := q.Result |
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if len(existingGroupRules) > 0 { |
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affectedGroups[groupKey] = existingGroupRules |
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} |
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existingGroupRulesUIDs := make(map[string]*models.AlertRule, len(existingGroupRules)) |
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for _, r := range existingGroupRules { |
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existingGroupRulesUIDs[r.UID] = r |
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} |
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var toAdd, toDelete []*models.AlertRule |
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var toUpdate []RuleDelta |
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loadedRulesByUID := map[string]*models.AlertRule{} // auxiliary cache to avoid unnecessary queries if there are multiple moves from the same group
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for _, r := range submittedRules { |
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var existing *models.AlertRule = nil |
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if r.UID != "" { |
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if existingGroupRule, ok := existingGroupRulesUIDs[r.UID]; ok { |
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existing = existingGroupRule |
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// remove the rule from existingGroupRulesUIDs
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delete(existingGroupRulesUIDs, r.UID) |
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} else if existing, ok = loadedRulesByUID[r.UID]; !ok { // check the "cache" and if there is no hit, query the database
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// Rule can be from other group or namespace
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q := &models.GetAlertRulesGroupByRuleUIDQuery{OrgID: groupKey.OrgID, UID: r.UID} |
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if err := ruleReader.GetAlertRulesGroupByRuleUID(ctx, q); err != nil { |
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return nil, fmt.Errorf("failed to query database for a group of alert rules: %w", err) |
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} |
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for _, rule := range q.Result { |
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if rule.UID == r.UID { |
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existing = rule |
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} |
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loadedRulesByUID[rule.UID] = rule |
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} |
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if existing == nil { |
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return nil, fmt.Errorf("failed to update rule with UID %s because %w", r.UID, models.ErrAlertRuleNotFound) |
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} |
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affectedGroups[existing.GetGroupKey()] = q.Result |
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} |
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} |
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if existing == nil { |
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toAdd = append(toAdd, r) |
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continue |
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} |
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models.PatchPartialAlertRule(existing, r) |
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diff := existing.Diff(r, AlertRuleFieldsToIgnoreInDiff[:]...) |
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if len(diff) == 0 { |
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continue |
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} |
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toUpdate = append(toUpdate, RuleDelta{ |
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Existing: existing, |
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New: r, |
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Diff: diff, |
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}) |
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continue |
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} |
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for _, rule := range existingGroupRulesUIDs { |
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toDelete = append(toDelete, rule) |
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} |
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return &GroupDelta{ |
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GroupKey: groupKey, |
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AffectedGroups: affectedGroups, |
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New: toAdd, |
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Delete: toDelete, |
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Update: toUpdate, |
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}, nil |
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} |
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// UpdateCalculatedRuleFields refreshes the calculated fields in a set of alert rule changes.
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// This may generate new changes to keep a group consistent, such as versions or rule indexes.
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func UpdateCalculatedRuleFields(ch *GroupDelta) *GroupDelta { |
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updatingRules := make(map[models.AlertRuleKey]struct{}, len(ch.Delete)+len(ch.Update)) |
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for _, update := range ch.Update { |
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updatingRules[update.Existing.GetKey()] = struct{}{} |
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} |
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for _, del := range ch.Delete { |
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updatingRules[del.GetKey()] = struct{}{} |
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} |
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var toUpdate []RuleDelta |
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for groupKey, rules := range ch.AffectedGroups { |
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if groupKey != ch.GroupKey { |
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rules.SortByGroupIndex() |
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} |
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idx := 1 |
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for _, rule := range rules { |
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if _, ok := updatingRules[rule.GetKey()]; ok { // exclude rules that are going to be either updated or deleted
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continue |
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} |
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upd := RuleDelta{ |
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Existing: rule, |
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New: rule, |
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} |
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if groupKey != ch.GroupKey { |
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if rule.RuleGroupIndex != idx { |
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upd.New = models.CopyRule(rule) |
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upd.New.RuleGroupIndex = idx |
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upd.Diff = rule.Diff(upd.New, AlertRuleFieldsToIgnoreInDiff[:]...) |
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} |
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idx++ |
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} |
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toUpdate = append(toUpdate, upd) |
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} |
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} |
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return &GroupDelta{ |
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GroupKey: ch.GroupKey, |
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AffectedGroups: ch.AffectedGroups, |
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New: ch.New, |
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Update: append(ch.Update, toUpdate...), |
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Delete: ch.Delete, |
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} |
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} |
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@ -0,0 +1,456 @@ |
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package store |
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import ( |
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"context" |
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"errors" |
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"fmt" |
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"testing" |
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"time" |
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grafana_models "github.com/grafana/grafana/pkg/models" |
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"github.com/grafana/grafana/pkg/services/ngalert/models" |
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"github.com/grafana/grafana/pkg/util" |
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"github.com/stretchr/testify/assert" |
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"github.com/stretchr/testify/require" |
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"golang.org/x/exp/rand" |
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) |
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func TestCalculateChanges(t *testing.T) { |
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orgId := rand.Int63() |
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t.Run("detects alerts that need to be added", func(t *testing.T) { |
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fakeStore := NewFakeRuleStore(t) |
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groupKey := models.GenerateGroupKey(orgId) |
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submitted := models.GenerateAlertRules(rand.Intn(5)+1, models.AlertRuleGen(withOrgID(orgId), simulateSubmitted, withoutUID)) |
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changes, err := CalculateChanges(context.Background(), fakeStore, groupKey, submitted) |
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require.NoError(t, err) |
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require.Len(t, changes.New, len(submitted)) |
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require.Empty(t, changes.Delete) |
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require.Empty(t, changes.Update) |
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outerloop: |
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for _, expected := range submitted { |
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for _, rule := range changes.New { |
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if len(expected.Diff(rule)) == 0 { |
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continue outerloop |
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} |
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} |
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require.Fail(t, "changes did not contain rule that was submitted") |
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} |
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}) |
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t.Run("detects alerts that need to be deleted", func(t *testing.T) { |
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groupKey := models.GenerateGroupKey(orgId) |
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inDatabaseMap, inDatabase := models.GenerateUniqueAlertRules(rand.Intn(5)+1, models.AlertRuleGen(withGroupKey(groupKey))) |
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fakeStore := NewFakeRuleStore(t) |
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fakeStore.PutRule(context.Background(), inDatabase...) |
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changes, err := CalculateChanges(context.Background(), fakeStore, groupKey, make([]*models.AlertRule, 0)) |
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require.NoError(t, err) |
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require.Equal(t, groupKey, changes.GroupKey) |
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require.Empty(t, changes.New) |
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require.Empty(t, changes.Update) |
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require.Len(t, changes.Delete, len(inDatabaseMap)) |
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for _, toDelete := range changes.Delete { |
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require.Contains(t, inDatabaseMap, toDelete.UID) |
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db := inDatabaseMap[toDelete.UID] |
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require.Equal(t, db, toDelete) |
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} |
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require.Contains(t, changes.AffectedGroups, groupKey) |
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require.Equal(t, models.RulesGroup(inDatabase), changes.AffectedGroups[groupKey]) |
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}) |
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t.Run("should detect alerts that needs to be updated", func(t *testing.T) { |
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groupKey := models.GenerateGroupKey(orgId) |
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inDatabaseMap, inDatabase := models.GenerateUniqueAlertRules(rand.Intn(5)+1, models.AlertRuleGen(withGroupKey(groupKey))) |
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submittedMap, submitted := models.GenerateUniqueAlertRules(len(inDatabase), models.AlertRuleGen(simulateSubmitted, withGroupKey(groupKey), withUIDs(inDatabaseMap))) |
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fakeStore := NewFakeRuleStore(t) |
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fakeStore.PutRule(context.Background(), inDatabase...) |
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changes, err := CalculateChanges(context.Background(), fakeStore, groupKey, submitted) |
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require.NoError(t, err) |
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require.Equal(t, groupKey, changes.GroupKey) |
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require.Len(t, changes.Update, len(inDatabase)) |
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for _, upsert := range changes.Update { |
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require.NotNil(t, upsert.Existing) |
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require.Equal(t, upsert.Existing.UID, upsert.New.UID) |
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require.Equal(t, inDatabaseMap[upsert.Existing.UID], upsert.Existing) |
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require.Equal(t, submittedMap[upsert.Existing.UID], upsert.New) |
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require.NotEmpty(t, upsert.Diff) |
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} |
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require.Empty(t, changes.Delete) |
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require.Empty(t, changes.New) |
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require.Contains(t, changes.AffectedGroups, groupKey) |
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require.Equal(t, models.RulesGroup(inDatabase), changes.AffectedGroups[groupKey]) |
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}) |
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t.Run("should include only if there are changes ignoring specific fields", func(t *testing.T) { |
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groupKey := models.GenerateGroupKey(orgId) |
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_, inDatabase := models.GenerateUniqueAlertRules(rand.Intn(5)+1, models.AlertRuleGen(withGroupKey(groupKey))) |
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submitted := make([]*models.AlertRule, 0, len(inDatabase)) |
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for _, rule := range inDatabase { |
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r := models.CopyRule(rule) |
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// Ignore difference in the following fields as submitted models do not have them set
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r.ID = rand.Int63() |
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r.Version = rand.Int63() |
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r.Updated = r.Updated.Add(1 * time.Minute) |
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submitted = append(submitted, r) |
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} |
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fakeStore := NewFakeRuleStore(t) |
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fakeStore.PutRule(context.Background(), inDatabase...) |
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changes, err := CalculateChanges(context.Background(), fakeStore, groupKey, submitted) |
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require.NoError(t, err) |
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require.Empty(t, changes.Update) |
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require.Empty(t, changes.Delete) |
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require.Empty(t, changes.New) |
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}) |
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t.Run("should patch rule with UID specified by existing rule", func(t *testing.T) { |
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testCases := []struct { |
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name string |
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mutator func(r *models.AlertRule) |
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}{ |
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{ |
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name: "title is empty", |
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mutator: func(r *models.AlertRule) { |
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r.Title = "" |
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}, |
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}, |
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{ |
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name: "condition and data are empty", |
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mutator: func(r *models.AlertRule) { |
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r.Condition = "" |
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r.Data = nil |
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}, |
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}, |
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{ |
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name: "ExecErrState is empty", |
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mutator: func(r *models.AlertRule) { |
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r.ExecErrState = "" |
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}, |
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}, |
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{ |
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name: "NoDataState is empty", |
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mutator: func(r *models.AlertRule) { |
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r.NoDataState = "" |
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}, |
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}, |
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{ |
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name: "For is 0", |
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mutator: func(r *models.AlertRule) { |
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r.For = 0 |
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}, |
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}, |
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} |
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dbRule := models.AlertRuleGen(withOrgID(orgId))() |
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fakeStore := NewFakeRuleStore(t) |
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fakeStore.PutRule(context.Background(), dbRule) |
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groupKey := models.GenerateGroupKey(orgId) |
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for _, testCase := range testCases { |
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t.Run(testCase.name, func(t *testing.T) { |
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expected := models.AlertRuleGen(simulateSubmitted, testCase.mutator)() |
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expected.UID = dbRule.UID |
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submitted := *expected |
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changes, err := CalculateChanges(context.Background(), fakeStore, groupKey, []*models.AlertRule{&submitted}) |
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require.NoError(t, err) |
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require.Len(t, changes.Update, 1) |
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ch := changes.Update[0] |
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require.Equal(t, ch.Existing, dbRule) |
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fixed := *expected |
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models.PatchPartialAlertRule(dbRule, &fixed) |
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require.Equal(t, fixed, *ch.New) |
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}) |
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} |
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}) |
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t.Run("should be able to find alerts by UID in other group/namespace", func(t *testing.T) { |
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sourceGroupKey := models.GenerateGroupKey(orgId) |
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inDatabaseMap, inDatabase := models.GenerateUniqueAlertRules(rand.Intn(10)+10, models.AlertRuleGen(withGroupKey(sourceGroupKey))) |
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fakeStore := NewFakeRuleStore(t) |
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fakeStore.PutRule(context.Background(), inDatabase...) |
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namespace := randFolder() |
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groupName := util.GenerateShortUID() |
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groupKey := models.AlertRuleGroupKey{ |
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OrgID: orgId, |
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NamespaceUID: namespace.Uid, |
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RuleGroup: groupName, |
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} |
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submittedMap, submitted := models.GenerateUniqueAlertRules(rand.Intn(len(inDatabase)-5)+5, models.AlertRuleGen(simulateSubmitted, withGroupKey(groupKey), withUIDs(inDatabaseMap))) |
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changes, err := CalculateChanges(context.Background(), fakeStore, groupKey, submitted) |
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require.NoError(t, err) |
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require.Equal(t, groupKey, changes.GroupKey) |
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require.Empty(t, changes.Delete) |
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require.Empty(t, changes.New) |
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require.Len(t, changes.Update, len(submitted)) |
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for _, update := range changes.Update { |
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require.NotNil(t, update.Existing) |
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require.Equal(t, update.Existing.UID, update.New.UID) |
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require.Equal(t, inDatabaseMap[update.Existing.UID], update.Existing) |
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require.Equal(t, submittedMap[update.Existing.UID], update.New) |
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require.NotEmpty(t, update.Diff) |
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} |
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require.Contains(t, changes.AffectedGroups, sourceGroupKey) |
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require.NotContains(t, changes.AffectedGroups, groupKey) // because there is no such group in database yet
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require.Len(t, changes.AffectedGroups[sourceGroupKey], len(inDatabase)) |
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}) |
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t.Run("should fail when submitted rule has UID that does not exist in db", func(t *testing.T) { |
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fakeStore := NewFakeRuleStore(t) |
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groupKey := models.GenerateGroupKey(orgId) |
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submitted := models.AlertRuleGen(withOrgID(orgId), simulateSubmitted)() |
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require.NotEqual(t, "", submitted.UID) |
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_, err := CalculateChanges(context.Background(), fakeStore, groupKey, []*models.AlertRule{submitted}) |
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require.Error(t, err) |
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}) |
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t.Run("should fail if cannot fetch current rules in the group", func(t *testing.T) { |
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fakeStore := NewFakeRuleStore(t) |
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expectedErr := errors.New("TEST ERROR") |
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fakeStore.Hook = func(cmd interface{}) error { |
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switch cmd.(type) { |
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case models.ListAlertRulesQuery: |
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return expectedErr |
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} |
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return nil |
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} |
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groupKey := models.GenerateGroupKey(orgId) |
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submitted := models.AlertRuleGen(withOrgID(orgId), simulateSubmitted, withoutUID)() |
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_, err := CalculateChanges(context.Background(), fakeStore, groupKey, []*models.AlertRule{submitted}) |
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require.ErrorIs(t, err, expectedErr) |
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}) |
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t.Run("should fail if cannot fetch rule by UID", func(t *testing.T) { |
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fakeStore := NewFakeRuleStore(t) |
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expectedErr := errors.New("TEST ERROR") |
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fakeStore.Hook = func(cmd interface{}) error { |
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switch cmd.(type) { |
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case models.GetAlertRulesGroupByRuleUIDQuery: |
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return expectedErr |
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} |
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return nil |
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} |
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groupKey := models.GenerateGroupKey(orgId) |
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submitted := models.AlertRuleGen(withOrgID(orgId), simulateSubmitted)() |
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_, err := CalculateChanges(context.Background(), fakeStore, groupKey, []*models.AlertRule{submitted}) |
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require.ErrorIs(t, err, expectedErr) |
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}) |
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} |
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func TestCalculateAutomaticChanges(t *testing.T) { |
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orgID := rand.Int63() |
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t.Run("should mark all rules in affected groups", func(t *testing.T) { |
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group := models.GenerateGroupKey(orgID) |
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rules := models.GenerateAlertRules(10, models.AlertRuleGen(withGroupKey(group))) |
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// copy rules to make sure that the function does not modify the original rules
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copies := make([]*models.AlertRule, 0, len(rules)) |
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for _, rule := range rules { |
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copies = append(copies, models.CopyRule(rule)) |
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} |
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var updates []RuleDelta |
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for i := 0; i < 5; i++ { |
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ruleCopy := models.CopyRule(copies[i]) |
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ruleCopy.Title += util.GenerateShortUID() |
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updates = append(updates, RuleDelta{ |
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Existing: copies[i], |
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New: ruleCopy, |
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}) |
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} |
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// simulate adding new rules, updating a few existing and delete some from the same rule
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ch := &GroupDelta{ |
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GroupKey: group, |
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AffectedGroups: map[models.AlertRuleGroupKey]models.RulesGroup{ |
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group: copies, |
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}, |
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New: models.GenerateAlertRules(2, models.AlertRuleGen(withGroupKey(group))), |
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Update: updates, |
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Delete: rules[5:7], |
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} |
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result := UpdateCalculatedRuleFields(ch) |
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require.NotEqual(t, ch, result) |
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require.Equal(t, ch.GroupKey, result.GroupKey) |
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require.Equal(t, map[models.AlertRuleGroupKey]models.RulesGroup{ |
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group: rules, |
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}, result.AffectedGroups) |
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require.Equal(t, ch.New, result.New) |
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require.Equal(t, rules[5:7], result.Delete) |
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var expected []RuleDelta |
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expected = append(expected, updates...) |
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// all rules that were not updated directly by user should be added to the
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for _, rule := range rules[7:] { |
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expected = append(expected, RuleDelta{ |
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Existing: rule, |
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New: rule, |
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}) |
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} |
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require.Equal(t, expected, result.Update) |
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}) |
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t.Run("should re-index rules in affected groups other than updated", func(t *testing.T) { |
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group := models.GenerateGroupKey(orgID) |
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rules := models.GenerateAlertRules(3, models.AlertRuleGen(withGroupKey(group), models.WithSequentialGroupIndex())) |
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group2 := models.GenerateGroupKey(orgID) |
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rules2 := models.GenerateAlertRules(4, models.AlertRuleGen(withGroupKey(group2), models.WithSequentialGroupIndex())) |
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movedIndex := rand.Intn(len(rules2) - 1) |
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movedRule := rules2[movedIndex] |
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copyRule := models.CopyRule(movedRule) |
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copyRule.RuleGroup = group.RuleGroup |
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copyRule.NamespaceUID = group.NamespaceUID |
||||
copyRule.RuleGroupIndex = len(rules) |
||||
update := RuleDelta{ |
||||
Existing: movedRule, |
||||
New: copyRule, |
||||
} |
||||
|
||||
shuffled := make([]*models.AlertRule, 0, len(rules2)) |
||||
copy(shuffled, rules2) |
||||
rand.Shuffle(len(shuffled), func(i, j int) { |
||||
shuffled[i], shuffled[j] = shuffled[j], shuffled[i] |
||||
}) |
||||
|
||||
// simulate moving a rule from one group to another.
|
||||
ch := &GroupDelta{ |
||||
GroupKey: group, |
||||
AffectedGroups: map[models.AlertRuleGroupKey]models.RulesGroup{ |
||||
group: rules, |
||||
group2: shuffled, |
||||
}, |
||||
Update: []RuleDelta{ |
||||
update, |
||||
}, |
||||
} |
||||
|
||||
result := UpdateCalculatedRuleFields(ch) |
||||
|
||||
require.NotEqual(t, ch, result) |
||||
require.Equal(t, ch.GroupKey, result.GroupKey) |
||||
require.Equal(t, ch.AffectedGroups, result.AffectedGroups) |
||||
require.Equal(t, ch.New, result.New) |
||||
require.Equal(t, ch.Delete, result.Delete) |
||||
|
||||
require.Equal(t, ch.Update, result.Update[0:1]) |
||||
|
||||
require.Contains(t, result.Update, update) |
||||
for _, rule := range rules { |
||||
assert.Containsf(t, result.Update, RuleDelta{ |
||||
Existing: rule, |
||||
New: rule, |
||||
}, "automatic changes expected to contain all rules of the updated group") |
||||
} |
||||
|
||||
// calculate expected index of the rules in the source group after the move
|
||||
expectedReindex := make(map[string]int, len(rules2)-1) |
||||
idx := 1 |
||||
for _, rule := range rules2 { |
||||
if rule.UID == movedRule.UID { |
||||
continue |
||||
} |
||||
expectedReindex[rule.UID] = idx |
||||
idx++ |
||||
} |
||||
|
||||
for _, upd := range result.Update { |
||||
expectedIdx, ok := expectedReindex[upd.Existing.UID] |
||||
if !ok { |
||||
continue |
||||
} |
||||
diff := upd.Existing.Diff(upd.New) |
||||
if upd.Existing.RuleGroupIndex != expectedIdx { |
||||
require.Lenf(t, diff, 1, fmt.Sprintf("the rule in affected group should be re-indexed to %d but it still has index %d. Moved rule with index %d", expectedIdx, upd.Existing.RuleGroupIndex, movedIndex)) |
||||
require.Equal(t, "RuleGroupIndex", diff[0].Path) |
||||
require.Equal(t, expectedIdx, upd.New.RuleGroupIndex) |
||||
} else { |
||||
require.Empty(t, diff) |
||||
} |
||||
} |
||||
}) |
||||
} |
||||
|
||||
// simulateSubmitted resets some fields of the structure that are not populated by API model to model conversion
|
||||
func simulateSubmitted(rule *models.AlertRule) { |
||||
rule.ID = 0 |
||||
rule.Version = 0 |
||||
rule.Updated = time.Time{} |
||||
} |
||||
|
||||
func withOrgID(orgId int64) func(rule *models.AlertRule) { |
||||
return func(rule *models.AlertRule) { |
||||
rule.OrgID = orgId |
||||
} |
||||
} |
||||
|
||||
func withoutUID(rule *models.AlertRule) { |
||||
rule.UID = "" |
||||
} |
||||
|
||||
func withGroupKey(groupKey models.AlertRuleGroupKey) func(rule *models.AlertRule) { |
||||
return func(rule *models.AlertRule) { |
||||
rule.RuleGroup = groupKey.RuleGroup |
||||
rule.OrgID = groupKey.OrgID |
||||
rule.NamespaceUID = groupKey.NamespaceUID |
||||
} |
||||
} |
||||
|
||||
func withUIDs(uids map[string]*models.AlertRule) func(rule *models.AlertRule) { |
||||
unused := make([]string, 0, len(uids)) |
||||
for s := range uids { |
||||
unused = append(unused, s) |
||||
} |
||||
return func(rule *models.AlertRule) { |
||||
if len(unused) == 0 { |
||||
return |
||||
} |
||||
rule.UID = unused[0] |
||||
unused = unused[1:] |
||||
} |
||||
} |
||||
|
||||
func randFolder() *grafana_models.Folder { |
||||
return &grafana_models.Folder{ |
||||
Id: rand.Int63(), |
||||
Uid: util.GenerateShortUID(), |
||||
Title: "TEST-FOLDER-" + util.GenerateShortUID(), |
||||
Url: "", |
||||
Version: 0, |
||||
Created: time.Time{}, |
||||
Updated: time.Time{}, |
||||
UpdatedBy: 0, |
||||
CreatedBy: 0, |
||||
} |
||||
} |
||||
Loading…
Reference in new issue