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[FSSDK-11552] Add holdout support and refactor decision logic (#422)
* add holdouts service and logic * fix: resolve range variable address bug in holdout loop (CWE-118) - Changed loop from 'for _, holdout := range holdouts' to 'for i := range holdouts' - Created proper pointer 'holdout := &holdouts[i]' to avoid address-of-iteration-variable issue - This fixes the security warning where all iterations would point to the same memory location - All tests passing Resolves Prisma Cloud security scan: Incorrect access of indexable resource * feat: Complete holdout implementation with parsing, mapping, and tests - Implemented holdout parsing from datafile with global/specific/exclusion logic - Added MapHoldouts() to process holdout relationships with feature flags - Implemented GetHoldoutsForFlag() to retrieve applicable holdouts per flag - Fixed bucketer initialization to use pointer (interface value) - Created comprehensive unit tests for HoldoutService (11 test cases) - Added integration test with real bucketer and evaluator - Added GetHoldoutsForFlag() mock method to helpers_test.go All tests passing (decision and config packages) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> * test: Add comprehensive tests for holdout implementation and fix linting - Added 3 unit tests for GetHoldoutsForFlag() in config_test.go - Created holdout_test.go with 7 comprehensive mapper tests: - Empty holdouts - Global holdouts with exclusions - Specific holdouts with inclusions - Non-running holdouts filtering - Mixed global and specific holdouts - Audience conditions mapping - Variations and traffic allocation mapping - Fixed govet shadow linting error in holdout_service.go line 105 All tests passing. Improves code coverage for new holdout functionality. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> * fixed holdouts precendence order --------- Co-authored-by: Claude <noreply@anthropic.com>
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‎pkg/cmab/service_test.go‎

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@@ -230,6 +230,11 @@ func (m *MockProjectConfig) GetRegion() string {
230230
return args.String(0)
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}
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233+
func (m *MockProjectConfig) GetHoldoutsForFlag(featureKey string) []entities.Holdout {
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args := m.Called(featureKey)
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return args.Get(0).([]entities.Holdout)
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}
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233238
type CmabServiceTestSuite struct {
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suite.Suite
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mockClient *MockCmabClient

‎pkg/config/datafileprojectconfig/config.go‎

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@@ -60,6 +60,9 @@ type DatafileProjectConfig struct {
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region string
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flagVariationsMap map[string][]entities.Variation
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holdouts []entities.Holdout
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holdoutIDMap map[string]entities.Holdout
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flagHoldoutsMap map[string][]entities.Holdout
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}
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// GetDatafile returns a string representation of the environment's datafile
@@ -281,6 +284,14 @@ func (c DatafileProjectConfig) GetRegion() string {
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return c.region
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}
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// GetHoldoutsForFlag returns all holdouts applicable to the given feature flag
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func (c DatafileProjectConfig) GetHoldoutsForFlag(featureKey string) []entities.Holdout {
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if holdouts, exists := c.flagHoldoutsMap[featureKey]; exists {
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return holdouts
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}
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return []entities.Holdout{}
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}
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284295
// NewDatafileProjectConfig initializes a new datafile from a json byte array using the default JSON datafile parser
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func NewDatafileProjectConfig(jsonDatafile []byte, logger logging.OptimizelyLogProducer) (*DatafileProjectConfig, error) {
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datafile, err := Parse(jsonDatafile)
@@ -323,6 +334,7 @@ func NewDatafileProjectConfig(jsonDatafile []byte, logger logging.OptimizelyLogP
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featureMap := mappers.MapFeatures(datafile.FeatureFlags, rolloutMap, experimentIDMap)
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audienceMap, audienceSegmentList := mappers.MapAudiences(append(datafile.TypedAudiences, datafile.Audiences...))
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flagVariationsMap := mappers.MapFlagVariations(featureMap)
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holdouts, holdoutIDMap, flagHoldoutsMap := mappers.MapHoldouts(datafile.Holdouts, featureMap)
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327339
attributeKeyMap := make(map[string]entities.Attribute)
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attributeIDToKeyMap := make(map[string]string)
@@ -365,6 +377,9 @@ func NewDatafileProjectConfig(jsonDatafile []byte, logger logging.OptimizelyLogP
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attributeKeyMap: attributeKeyMap,
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attributeIDToKeyMap: attributeIDToKeyMap,
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region: region,
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holdouts: holdouts,
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holdoutIDMap: holdoutIDMap,
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flagHoldoutsMap: flagHoldoutsMap,
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}
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logger.Info("Datafile is valid.")

‎pkg/config/datafileprojectconfig/config_test.go‎

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@@ -728,3 +728,64 @@ func TestGetAttributeByKeyWithDirectMapping(t *testing.T) {
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assert.Nil(t, err)
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assert.Equal(t, attribute, actual)
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}
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func TestGetHoldoutsForFlagWithHoldouts(t *testing.T) {
733+
flagKey := "test_flag"
734+
holdout1 := entities.Holdout{
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ID: "holdout_1",
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Key: "test_holdout_1",
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Status: entities.HoldoutStatusRunning,
738+
}
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holdout2 := entities.Holdout{
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ID: "holdout_2",
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Key: "test_holdout_2",
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Status: entities.HoldoutStatusRunning,
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}
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flagHoldoutsMap := make(map[string][]entities.Holdout)
746+
flagHoldoutsMap[flagKey] = []entities.Holdout{holdout1, holdout2}
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config := &DatafileProjectConfig{
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flagHoldoutsMap: flagHoldoutsMap,
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}
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actual := config.GetHoldoutsForFlag(flagKey)
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assert.Len(t, actual, 2)
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assert.Equal(t, holdout1, actual[0])
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assert.Equal(t, holdout2, actual[1])
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}
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func TestGetHoldoutsForFlagWithNoHoldouts(t *testing.T) {
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flagKey := "test_flag"
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flagHoldoutsMap := make(map[string][]entities.Holdout)
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config := &DatafileProjectConfig{
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flagHoldoutsMap: flagHoldoutsMap,
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}
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actual := config.GetHoldoutsForFlag(flagKey)
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assert.Len(t, actual, 0)
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assert.Equal(t, []entities.Holdout{}, actual)
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}
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771+
func TestGetHoldoutsForFlagWithDifferentFlag(t *testing.T) {
772+
flagKey := "test_flag"
773+
otherFlagKey := "other_flag"
774+
holdout := entities.Holdout{
775+
ID: "holdout_1",
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Key: "test_holdout_1",
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Status: entities.HoldoutStatusRunning,
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}
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780+
flagHoldoutsMap := make(map[string][]entities.Holdout)
781+
flagHoldoutsMap[otherFlagKey] = []entities.Holdout{holdout}
782+
783+
config := &DatafileProjectConfig{
784+
flagHoldoutsMap: flagHoldoutsMap,
785+
}
786+
787+
// Request different flag - should return empty
788+
actual := config.GetHoldoutsForFlag(flagKey)
789+
assert.Len(t, actual, 0)
790+
assert.Equal(t, []entities.Holdout{}, actual)
791+
}

‎pkg/config/datafileprojectconfig/entities/entities.go‎

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Original file line numberDiff line numberDiff line change
@@ -113,6 +113,19 @@ type Rollout struct {
113113
Experiments []Experiment `json:"experiments"`
114114
}
115115

116+
// Holdout represents a holdout from the Optimizely datafile
117+
type Holdout struct {
118+
ID string `json:"id"`
119+
Key string `json:"key"`
120+
Status string `json:"status"`
121+
AudienceIds []string `json:"audienceIds"`
122+
AudienceConditions interface{} `json:"audienceConditions"`
123+
Variations []Variation `json:"variations"`
124+
TrafficAllocation []TrafficAllocation `json:"trafficAllocation"`
125+
IncludedFlags []string `json:"includedFlags,omitempty"`
126+
ExcludedFlags []string `json:"excludedFlags,omitempty"`
127+
}
128+
116129
// Integration represents a integration from the Optimizely datafile
117130
type Integration struct {
118131
Key *string `json:"key"`
@@ -129,6 +142,7 @@ type Datafile struct {
129142
FeatureFlags []FeatureFlag `json:"featureFlags"`
130143
Events []Event `json:"events"`
131144
Rollouts []Rollout `json:"rollouts"`
145+
Holdouts []Holdout `json:"holdouts,omitempty"`
132146
Integrations []Integration `json:"integrations"`
133147
TypedAudiences []Audience `json:"typedAudiences"`
134148
Variables []string `json:"variables"`

‎pkg/config/datafileprojectconfig/mappers/holdout.go‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,143 @@
1+
/****************************************************************************
2+
* Copyright 2025, Optimizely, Inc. and contributors *
3+
* *
4+
* Licensed under the Apache License, Version 2.0 (the "License"); *
5+
* you may not use this file except in compliance with the License. *
6+
* You may obtain a copy of the License at *
7+
* *
8+
* http://www.apache.org/licenses/LICENSE-2.0 *
9+
* *
10+
* Unless required by applicable law or agreed to in writing, software *
11+
* distributed under the License is distributed on an "AS IS" BASIS, *
12+
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
13+
* See the License for the specific language governing permissions and *
14+
* limitations under the License. *
15+
***************************************************************************/
16+
17+
// Package mappers ...
18+
package mappers
19+
20+
import (
21+
datafileEntities "github.com/optimizely/go-sdk/v2/pkg/config/datafileprojectconfig/entities"
22+
"github.com/optimizely/go-sdk/v2/pkg/entities"
23+
)
24+
25+
// MapHoldouts maps the raw datafile holdout entities to SDK Holdout entities
26+
// and organizes them by flag relationships
27+
func MapHoldouts(holdouts []datafileEntities.Holdout, featureMap map[string]entities.Feature) (
28+
holdoutList []entities.Holdout,
29+
holdoutIDMap map[string]entities.Holdout,
30+
flagHoldoutsMap map[string][]entities.Holdout,
31+
) {
32+
holdoutList = []entities.Holdout{}
33+
holdoutIDMap = make(map[string]entities.Holdout)
34+
flagHoldoutsMap = make(map[string][]entities.Holdout)
35+
36+
globalHoldouts := []entities.Holdout{}
37+
includedHoldouts := make(map[string][]entities.Holdout)
38+
excludedHoldouts := make(map[string][]entities.Holdout)
39+
40+
for _, holdout := range holdouts {
41+
// Only process running holdouts
42+
if holdout.Status != string(entities.HoldoutStatusRunning) {
43+
continue
44+
}
45+
46+
mappedHoldout := mapHoldout(holdout)
47+
holdoutList = append(holdoutList, mappedHoldout)
48+
holdoutIDMap[holdout.ID] = mappedHoldout
49+
50+
// Classify holdout by flag relationships
51+
if len(holdout.IncludedFlags) == 0 {
52+
// Global holdout - applies to all flags except excluded
53+
globalHoldouts = append(globalHoldouts, mappedHoldout)
54+
55+
// Track exclusions
56+
for _, flagID := range holdout.ExcludedFlags {
57+
excludedHoldouts[flagID] = append(excludedHoldouts[flagID], mappedHoldout)
58+
}
59+
} else {
60+
// Specific holdout - applies only to included flags
61+
for _, flagID := range holdout.IncludedFlags {
62+
includedHoldouts[flagID] = append(includedHoldouts[flagID], mappedHoldout)
63+
}
64+
}
65+
}
66+
67+
// Build flagHoldoutsMap by combining global and specific holdouts
68+
// Global holdouts take precedence (evaluated first), then specific holdouts
69+
for _, feature := range featureMap {
70+
flagKey := feature.Key
71+
flagID := feature.ID
72+
applicableHoldouts := []entities.Holdout{}
73+
74+
// Add global holdouts first (if not excluded) - they take precedence
75+
if _, exists := excludedHoldouts[flagID]; !exists {
76+
applicableHoldouts = append(applicableHoldouts, globalHoldouts...)
77+
}
78+
79+
// Add specifically included holdouts second
80+
if included, exists := includedHoldouts[flagID]; exists {
81+
applicableHoldouts = append(applicableHoldouts, included...)
82+
}
83+
84+
if len(applicableHoldouts) > 0 {
85+
flagHoldoutsMap[flagKey] = applicableHoldouts
86+
}
87+
}
88+
89+
return holdoutList, holdoutIDMap, flagHoldoutsMap
90+
}
91+
92+
func mapHoldout(datafileHoldout datafileEntities.Holdout) entities.Holdout {
93+
var audienceConditionTree *entities.TreeNode
94+
var err error
95+
96+
// Build audience condition tree similar to experiments
97+
if datafileHoldout.AudienceConditions == nil && len(datafileHoldout.AudienceIds) > 0 {
98+
audienceConditionTree, err = buildAudienceConditionTree(datafileHoldout.AudienceIds)
99+
} else {
100+
switch audienceConditions := datafileHoldout.AudienceConditions.(type) {
101+
case []interface{}:
102+
if len(audienceConditions) > 0 {
103+
audienceConditionTree, err = buildAudienceConditionTree(audienceConditions)
104+
}
105+
case string:
106+
if audienceConditions != "" {
107+
audienceConditionTree, err = buildAudienceConditionTree([]string{audienceConditions})
108+
}
109+
default:
110+
}
111+
}
112+
if err != nil {
113+
// @TODO: handle error
114+
func() {}() // cheat the linters
115+
}
116+
117+
// Map variations
118+
variations := make(map[string]entities.Variation)
119+
for _, datafileVariation := range datafileHoldout.Variations {
120+
variation := mapVariation(datafileVariation)
121+
variations[variation.ID] = variation
122+
}
123+
124+
// Map traffic allocations
125+
trafficAllocation := make([]entities.Range, len(datafileHoldout.TrafficAllocation))
126+
for i, allocation := range datafileHoldout.TrafficAllocation {
127+
trafficAllocation[i] = entities.Range{
128+
EntityID: allocation.EntityID,
129+
EndOfRange: allocation.EndOfRange,
130+
}
131+
}
132+
133+
return entities.Holdout{
134+
ID: datafileHoldout.ID,
135+
Key: datafileHoldout.Key,
136+
Status: entities.HoldoutStatus(datafileHoldout.Status),
137+
AudienceIds: datafileHoldout.AudienceIds,
138+
AudienceConditions: datafileHoldout.AudienceConditions,
139+
Variations: variations,
140+
TrafficAllocation: trafficAllocation,
141+
AudienceConditionTree: audienceConditionTree,
142+
}
143+
}

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