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feat: enable local evaluation (#129)
Signed-off-by: Alessandro Yuichi Okimoto <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| package evaluator | ||
|
|
||
| //go:generate mockgen -source=$GOFILE -package=$GOPACKAGE -destination=../../../test/mock/$GOPACKAGE/$GOFILE | ||
| import ( | ||
| "errors" | ||
|
|
||
| evaluation "github.com/bucketeer-io/bucketeer/evaluation" | ||
| ftproto "github.com/bucketeer-io/bucketeer/proto/feature" | ||
| userproto "github.com/bucketeer-io/bucketeer/proto/user" | ||
|
|
||
| "github.com/bucketeer-io/go-server-sdk/pkg/bucketeer/cache" | ||
| "github.com/bucketeer-io/go-server-sdk/pkg/bucketeer/model" | ||
| "github.com/bucketeer-io/go-server-sdk/pkg/bucketeer/user" | ||
| ) | ||
|
|
||
| type EvaluateLocally interface { | ||
| Evaluate(user *user.User, featureID string) (*model.Evaluation, error) | ||
| } | ||
|
|
||
| type evaluator struct { | ||
| tag string | ||
| featuresCache cache.FeaturesCache | ||
| segmentUsersCache cache.SegmentUsersCache | ||
| } | ||
|
|
||
| func NewEvaluator( | ||
| tag string, | ||
| featuresCache cache.FeaturesCache, | ||
| segmentUsersCache cache.SegmentUsersCache, | ||
| ) EvaluateLocally { | ||
| return &evaluator{ | ||
| tag: tag, | ||
| featuresCache: featuresCache, | ||
| segmentUsersCache: segmentUsersCache, | ||
| } | ||
| } | ||
|
|
||
| var ( | ||
| errEvaluationNotFound = errors.New("evaluation not found") | ||
| ) | ||
|
|
||
| func (e *evaluator) Evaluate(user *user.User, featureID string) (*model.Evaluation, error) { | ||
| // Get the target feature | ||
| feature, err := e.featuresCache.Get(featureID) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| // Include the prerequisite features if is configured | ||
| targetFeatures, err := e.getTargetFeatures(feature) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| // List and get all the segments if is configured in the targeting rules | ||
| evaluator := evaluation.NewEvaluator() | ||
| sIDs := evaluator.ListSegmentIDs(feature) | ||
| segments := make(map[string][]*ftproto.SegmentUser, len(sIDs)) | ||
| for _, id := range sIDs { | ||
| segment, err := e.segmentUsersCache.Get(id) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| segments[segment.SegmentId] = segment.Users | ||
| } | ||
| // Convert to evaluation's user proto message | ||
| u := &userproto.User{ | ||
| Id: user.ID, | ||
| Data: user.Data, | ||
| } | ||
| // Evaluate the end user | ||
| userEvaluations, err := evaluator.EvaluateFeatures( | ||
| targetFeatures, | ||
| u, | ||
| segments, | ||
| e.tag, | ||
| ) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| // Find the target evaluation from the results | ||
| eval, err := e.findEvaluation(userEvaluations.Evaluations, featureID) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| // Convert to SDK's model | ||
| evaluation := &model.Evaluation{ | ||
| ID: eval.Id, | ||
| FeatureID: eval.FeatureId, | ||
| FeatureVersion: eval.FeatureVersion, | ||
| UserID: eval.UserId, | ||
| VariationID: eval.VariationId, | ||
| VariationValue: eval.VariationValue, | ||
| Reason: &model.Reason{ | ||
| Type: model.ReasonType(eval.Reason.Type.String()), | ||
| RuleID: eval.Reason.RuleId, | ||
| }, | ||
| } | ||
| return evaluation, nil | ||
| } | ||
|
|
||
| func (e *evaluator) getTargetFeatures(feature *ftproto.Feature) ([]*ftproto.Feature, error) { | ||
| if len(feature.Prerequisites) == 0 { | ||
| return []*ftproto.Feature{feature}, nil | ||
| } | ||
| preFeatures, err := e.getPrerequisiteFeatures(feature) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return append([]*ftproto.Feature{feature}, preFeatures...), nil | ||
| } | ||
|
|
||
| // Gets the features specified as prerequisite | ||
| func (e *evaluator) getPrerequisiteFeatures(feature *ftproto.Feature) ([]*ftproto.Feature, error) { | ||
| prerequisites := make(map[string]*ftproto.Feature) | ||
| queue := append([]*ftproto.Feature{}, feature) | ||
| for len(queue) > 0 { | ||
| f := queue[0] | ||
| for _, p := range f.Prerequisites { | ||
| preFeature, err := e.featuresCache.Get(p.FeatureId) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| prerequisites[preFeature.Id] = preFeature | ||
| queue = append(queue, preFeature) | ||
| } | ||
| queue = queue[1:] | ||
| } | ||
| ftList := make([]*ftproto.Feature, 0, len(prerequisites)) | ||
| for _, v := range prerequisites { | ||
| ftList = append(ftList, v) | ||
| } | ||
| return ftList, nil | ||
| } | ||
|
|
||
| func (e *evaluator) findEvaluation(evals []*ftproto.Evaluation, id string) (*ftproto.Evaluation, error) { | ||
| for _, e := range evals { | ||
| if e.FeatureId == id { | ||
| return e, nil | ||
| } | ||
| } | ||
| return nil, errEvaluationNotFound | ||
| } |
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