engines.*SchemaBasedEntityFilter.tupleToUserSetEntrance - Code Metrics - Inspection of "Merge pull request #1470 from Permify/feat/paginat..." - Permify/permify - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Push — master ( 395fc4...2cecfe )

by Tolga

created 2024-08-20 20:54 UTC

rSetEntrance C

↳ Parent: internal/engines/schemaBasedEntityFilter.go

Complexity

Conditions

Size

Total Lines	81
Code Lines	45

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	8
eloc	45
nop	6
dl	0
loc	81
rs	6.9333
c	0
b	0
f	0

How to fix Long Method

package engines

import (
	"context"
	"errors"

	"golang.org/x/sync/errgroup"

	"github.com/Permify/permify/internal/schema"
	"github.com/Permify/permify/internal/storage"
	storageContext "github.com/Permify/permify/internal/storage/context"
	"github.com/Permify/permify/pkg/database"
	base "github.com/Permify/permify/pkg/pb/base/v1"
	"github.com/Permify/permify/pkg/tuple"
)

// SchemaBasedEntityFilter is a struct that performs permission checks on a set of entities
type SchemaBasedEntityFilter struct {
	// dataReader is responsible for reading relationship information
	dataReader storage.DataReader

	schema *base.SchemaDefinition
}

// NewSchemaBasedEntityFilter creates a new EntityFilter engine
func NewSchemaBasedEntityFilter(dataReader storage.DataReader, sch *base.SchemaDefinition) *SchemaBasedEntityFilter {
	return &SchemaBasedEntityFilter{
		dataReader: dataReader,
		schema:     sch,
	}
}

// EntityFilter is a method of the EntityFilterEngine struct. It executes a permission request for linked entities.
func (engine *SchemaBasedEntityFilter) EntityFilter(
	ctx context.Context, // A context used for tracing and cancellation.
	request *base.PermissionEntityFilterRequest, // A permission request for linked entities.
	visits *ERMap, // A map that keeps track of visited entities to avoid infinite loops.
	publisher *BulkEntityPublisher, // A custom publisher that publishes results in bulk.
) (err error) { // Returns an error if one occurs during execution.
	// Check if direct result
	if request.GetEntityReference().GetType() == request.GetSubject().GetType() && request.GetEntityReference().GetRelation() == request.GetSubject().GetRelation() {
		found := &base.Entity{
			Type: request.GetSubject().GetType(),
			Id:   request.GetSubject().GetId(),
		}

		// If the entity reference is the same as the subject, publish the result directly and return.
		publisher.Publish(found, &base.PermissionCheckRequestMetadata{
			SnapToken:     request.GetMetadata().GetSnapToken(),
			SchemaVersion: request.GetMetadata().GetSchemaVersion(),
			Depth:         request.GetMetadata().GetDepth(),
		}, request.GetContext(), base.CheckResult_CHECK_RESULT_UNSPECIFIED)
	}

	// Retrieve linked entrances
	cn := schema.NewLinkedGraph(engine.schema) // Create a new linked graph from the schema definition.
	var entrances []*schema.LinkedEntrance
	entrances, err = cn.RelationshipLinkedEntrances(
		&base.RelationReference{
			Type:     request.GetEntityReference().GetType(),
			Relation: request.GetEntityReference().GetRelation(),
		},
		&base.RelationReference{
			Type:     request.GetSubject().GetType(),
			Relation: request.GetSubject().GetRelation(),
		},
	) // Retrieve the linked entrances between the entity reference and subject.

	// Create a new context for executing goroutines and a cancel function.
	cctx, cancel := context.WithCancel(ctx)
	defer cancel()

	// Create a new errgroup and a new context that inherits the original context.
	g, cont := errgroup.WithContext(cctx)

	// Loop over each linked entrance.
	for _, entrance := range entrances {
		// Switch on the kind of linked entrance.
		switch entrance.LinkedEntranceKind() {
		case schema.RelationLinkedEntrance: // If the linked entrance is a relation entrance.
			err = engine.relationEntrance(cont, request, entrance, visits, g, publisher) // Call the relation entrance method.
			if err != nil {
				return err
			}
		case schema.ComputedUserSetLinkedEntrance: // If the linked entrance is a computed user set entrance.
			err = engine.l(ctx, request, &base.EntityAndRelation{ // Call the run method with a new entity and relation.
				Entity: &base.Entity{
					Type: entrance.TargetEntrance.GetType(),
					Id:   request.GetSubject().GetId(),
				},
				Relation: entrance.TargetEntrance.GetRelation(),
			}, visits, g, publisher)
			if err != nil {
				return err
			}
		case schema.TupleToUserSetLinkedEntrance: // If the linked entrance is a tuple to user set entrance.
			err = engine.tupleToUserSetEntrance(cont, request, entrance, visits, g, publisher) // Call the tuple to user set entrance method.
			if err != nil {
				return err
			}
		default:
			return errors.New("unknown linked entrance type") // Return an error if the linked entrance is of an unknown type.
		}
	}

	return g.Wait() // Wait for all goroutines in the errgroup to complete and return any errors that occur.
}

// relationEntrance is a method of the EntityFilterEngine struct. It handles relation entrances.
func (engine *SchemaBasedEntityFilter) relationEntrance(
	ctx context.Context, // A context used for tracing and cancellation.
	request *base.PermissionEntityFilterRequest, // A permission request for linked entities.
	entrance *schema.LinkedEntrance, // A linked entrance.
	visits *ERMap, // A map that keeps track of visited entities to avoid infinite loops.
	g *errgroup.Group, // An errgroup used for executing goroutines.
	publisher *BulkEntityPublisher, // A custom publisher that publishes results in bulk.
) error { // Returns an error if one occurs during execution.
	// Define a TupleFilter. This specifies which tuples we're interested in.
	// We want tuples that match the entity type and ID from the request, and have a specific relation.
	filter := &base.TupleFilter{
		Entity: &base.EntityFilter{
			Type: entrance.TargetEntrance.GetType(),
			Ids:  []string{},
		},
		Relation: entrance.TargetEntrance.GetRelation(),
		Subject: &base.SubjectFilter{
			Type:     request.GetSubject().GetType(),
			Ids:      []string{request.GetSubject().GetId()},
			Relation: request.GetSubject().GetRelation(),
		},
	}

	var (
		cti, rit   *database.TupleIterator
		err        error
		pagination database.CursorPagination
	)

	// Determine the pagination settings based on the entity type in the request.
	// If the entity type matches the target entrance, use cursor pagination with sorting by "entity_id".
	// Otherwise, use the default pagination settings.
	if request.GetEntityReference().GetType() == entrance.TargetEntrance.GetType() {
		pagination = database.NewCursorPagination(database.Cursor(request.GetCursor()), database.Sort("entity_id"))
	} else {
		pagination = database.NewCursorPagination()
	}

	// Query the relationships using the specified pagination settings.
	// The context tuples are filtered based on the provided filter.
	cti, err = storageContext.NewContextualTuples(request.GetContext().GetTuples()...).QueryRelationships(filter, pagination)
	if err != nil {
		return err
	}

	// Query the relationships for the entity in the request.
	// The results are filtered based on the provided filter and pagination settings.
	rit, err = engine.dataReader.QueryRelationships(ctx, request.GetTenantId(), filter, request.GetMetadata().GetSnapToken(), pagination)
	if err != nil {
		return err
	}

	// Create a new UniqueTupleIterator from the two TupleIterators.
	// NewUniqueTupleIterator() ensures that the iterator only returns unique tuples.
	it := database.NewUniqueTupleIterator(rit, cti)

	for it.HasNext() { // Loop over each relationship.
		// Get the next tuple's subject.
		current, ok := it.GetNext()
		if !ok {
			break
		}
		g.Go(func() error {
			return engine.l(ctx, request, &base.EntityAndRelation{ // Call the run method with a new entity and relation.
				Entity: &base.Entity{
					Type: current.GetEntity().GetType(),
					Id:   current.GetEntity().GetId(),
				},
				Relation: current.GetRelation(),
			}, visits, g, publisher)
		})
	}
	return nil
}

// tupleToUserSetEntrance is a method of the EntityFilterEngine struct. It handles tuple to user set entrances.
func (engine *SchemaBasedEntityFilter) tupleToUserSetEntrance(
	// A context used for tracing and cancellation.
	ctx context.Context,
	// A permission request for linked entities.
	request *base.PermissionEntityFilterRequest,
	// A linked entrance.
	entrance *schema.LinkedEntrance,
	// A map that keeps track of visited entities to avoid infinite loops.
	visits *ERMap,
	// An errgroup used for executing goroutines.
	g *errgroup.Group,
	// A custom publisher that publishes results in bulk.
	publisher *BulkEntityPublisher,
) error { // Returns an error if one occurs during execution.
	for _, relation := range []string{"", tuple.ELLIPSIS} {
		// Define a TupleFilter. This specifies which tuples we're interested in.
		// We want tuples that match the entity type and ID from the request, and have a specific relation.
		filter := &base.TupleFilter{
			Entity: &base.EntityFilter{
				Type: entrance.TargetEntrance.GetType(),
				Ids:  []string{},
			},
			Relation: entrance.TupleSetRelation, // Query for relationships that match the tuple set relation.
			Subject: &base.SubjectFilter{
				Type:     request.GetSubject().GetType(),
				Ids:      []string{request.GetSubject().GetId()},
				Relation: relation,
			},
		}

		var (
			cti, rit   *database.TupleIterator
			err        error
			pagination database.CursorPagination
		)

		// Determine the pagination settings based on the entity type in the request.
		// If the entity type matches the target entrance, use cursor pagination with sorting by "entity_id".
		// Otherwise, use the default pagination settings.
		if request.GetEntityReference().GetType() == entrance.TargetEntrance.GetType() {
			pagination = database.NewCursorPagination(database.Cursor(request.GetCursor()), database.Sort("entity_id"))
		} else {
			pagination = database.NewCursorPagination()
		}

		// Query the relationships using the specified pagination settings.
		// The context tuples are filtered based on the provided filter.
		cti, err = storageContext.NewContextualTuples(request.GetContext().GetTuples()...).QueryRelationships(filter, pagination)
		if err != nil {
			return err
		}

		// Query the relationships for the entity in the request.
		// The results are filtered based on the provided filter and pagination settings.
		rit, err = engine.dataReader.QueryRelationships(ctx, request.GetTenantId(), filter, request.GetMetadata().GetSnapToken(), pagination)
		if err != nil {
			return err
		}

		// Create a new UniqueTupleIterator from the two TupleIterators.
		// NewUniqueTupleIterator() ensures that the iterator only returns unique tuples.
		it := database.NewUniqueTupleIterator(rit, cti)

		for it.HasNext() { // Loop over each relationship.
			// Get the next tuple's subject.
			current, ok := it.GetNext()
			if !ok {
				break
			}
			g.Go(func() error {
				return engine.l(ctx, request, &base.EntityAndRelation{ // Call the run method with a new entity and relation.
					Entity: &base.Entity{
						Type: entrance.TargetEntrance.GetType(),
						Id:   current.GetEntity().GetId(),
					},
					Relation: entrance.TargetEntrance.GetRelation(),
				}, visits, g, publisher)
			})
		}
	}
	return nil
}

// run is a method of the EntityFilterEngine struct. It executes the linked entity engine for a given request.
func (engine *SchemaBasedEntityFilter) l(
	ctx context.Context, // A context used for tracing and cancellation.
	request *base.PermissionEntityFilterRequest, // A permission request for linked entities.
	found *base.EntityAndRelation, // An entity and relation that was previously found.
	visits *ERMap, // A map that keeps track of visited entities to avoid infinite loops.
	g *errgroup.Group, // An errgroup used for executing goroutines.
	publisher *BulkEntityPublisher, // A custom publisher that publishes results in bulk.
) error { // Returns an error if one occurs during execution.
	if !visits.Add(found.GetEntity(), found.GetRelation()) { // If the entity and relation has already been visited.
		return nil
	}

	var err error

	// Retrieve linked entrances
	cn := schema.NewLinkedGraph(engine.schema)
	var entrances []*schema.LinkedEntrance
	entrances, err = cn.RelationshipLinkedEntrances(
		&base.RelationReference{
			Type:     request.GetEntityReference().GetType(),
			Relation: request.GetEntityReference().GetRelation(),
		},
		&base.RelationReference{
			Type:     request.GetSubject().GetType(),
			Relation: request.GetSubject().GetRelation(),
		},
	) // Retrieve the linked entrances for the request.
	if err != nil {
		return err
	}

	if entrances == nil { // If there are no linked entrances for the request.
		if found.GetEntity().GetType() == request.GetEntityReference().GetType() && found.GetRelation() == request.GetEntityReference().GetRelation() { // Check if the found entity matches the requested entity reference.
			publisher.Publish(found.GetEntity(), &base.PermissionCheckRequestMetadata{ // Publish the found entity with the permission check metadata.
				SnapToken:     request.GetMetadata().GetSnapToken(),
				SchemaVersion: request.GetMetadata().GetSchemaVersion(),
				Depth:         request.GetMetadata().GetDepth(),
			}, request.GetContext(), base.CheckResult_CHECK_RESULT_UNSPECIFIED)
			return nil
		}
		return nil // Otherwise, return without publishing any results.
	}

	g.Go(func() error {
		return engine.EntityFilter(ctx, &base.PermissionEntityFilterRequest{ // Call the Run method recursively with a new permission request.
			TenantId:        request.GetTenantId(),
			EntityReference: request.GetEntityReference(),
			Subject: &base.Subject{
				Type:     found.GetEntity().GetType(),
				Id:       found.GetEntity().GetId(),
				Relation: found.GetRelation(),
			},
			Metadata: request.GetMetadata(),
			Context:  request.GetContext(),
			Cursor:   request.GetCursor(),
		}, visits, publisher)
	})
	return nil
}


1			package engines
2
3			import (
4			"context"
5			"errors"
6
7			"golang.org/x/sync/errgroup"
8
9			"github.com/Permify/permify/internal/schema"
10			"github.com/Permify/permify/internal/storage"
11			storageContext "github.com/Permify/permify/internal/storage/context"
12			"github.com/Permify/permify/pkg/database"
13			base "github.com/Permify/permify/pkg/pb/base/v1"
14			"github.com/Permify/permify/pkg/tuple"
15			)
16
17			// SchemaBasedEntityFilter is a struct that performs permission checks on a set of entities
18			type SchemaBasedEntityFilter struct {
19			// dataReader is responsible for reading relationship information
20			dataReader storage.DataReader
21
22			schema *base.SchemaDefinition
23			}
24
25			// NewSchemaBasedEntityFilter creates a new EntityFilter engine
26			func NewSchemaBasedEntityFilter(dataReader storage.DataReader, sch base.SchemaDefinition) SchemaBasedEntityFilter {
27			return &SchemaBasedEntityFilter{
28			dataReader: dataReader,
29			schema: sch,
30			}
31			}
32
33			// EntityFilter is a method of the EntityFilterEngine struct. It executes a permission request for linked entities.
34			func (engine *SchemaBasedEntityFilter) EntityFilter(
35			ctx context.Context, // A context used for tracing and cancellation.
36			request *base.PermissionEntityFilterRequest, // A permission request for linked entities.
37			visits *ERMap, // A map that keeps track of visited entities to avoid infinite loops.
38			publisher *BulkEntityPublisher, // A custom publisher that publishes results in bulk.
39			) (err error) { // Returns an error if one occurs during execution.
40			// Check if direct result
41			if request.GetEntityReference().GetType() == request.GetSubject().GetType() && request.GetEntityReference().GetRelation() == request.GetSubject().GetRelation() {
42			found := &base.Entity{
43			Type: request.GetSubject().GetType(),
44			Id: request.GetSubject().GetId(),
45			}
46
47			// If the entity reference is the same as the subject, publish the result directly and return.
48			publisher.Publish(found, &base.PermissionCheckRequestMetadata{
49			SnapToken: request.GetMetadata().GetSnapToken(),
50			SchemaVersion: request.GetMetadata().GetSchemaVersion(),
51			Depth: request.GetMetadata().GetDepth(),
52			}, request.GetContext(), base.CheckResult_CHECK_RESULT_UNSPECIFIED)
53			}
54
55			// Retrieve linked entrances
56			cn := schema.NewLinkedGraph(engine.schema) // Create a new linked graph from the schema definition.
57			var entrances []*schema.LinkedEntrance
58			entrances, err = cn.RelationshipLinkedEntrances(
59			&base.RelationReference{
60			Type: request.GetEntityReference().GetType(),
61			Relation: request.GetEntityReference().GetRelation(),
62			},
63			&base.RelationReference{
64			Type: request.GetSubject().GetType(),
65			Relation: request.GetSubject().GetRelation(),
66			},
67			) // Retrieve the linked entrances between the entity reference and subject.
68
69			// Create a new context for executing goroutines and a cancel function.
70			cctx, cancel := context.WithCancel(ctx)
71			defer cancel()
72
73			// Create a new errgroup and a new context that inherits the original context.
74			g, cont := errgroup.WithContext(cctx)
75
76			// Loop over each linked entrance.
77			for _, entrance := range entrances {
78			// Switch on the kind of linked entrance.
79			switch entrance.LinkedEntranceKind() {
80			case schema.RelationLinkedEntrance: // If the linked entrance is a relation entrance.
81			err = engine.relationEntrance(cont, request, entrance, visits, g, publisher) // Call the relation entrance method.
82			if err != nil {
83			return err
84			}
85			case schema.ComputedUserSetLinkedEntrance: // If the linked entrance is a computed user set entrance.
86			err = engine.l(ctx, request, &base.EntityAndRelation{ // Call the run method with a new entity and relation.
87			Entity: &base.Entity{
88			Type: entrance.TargetEntrance.GetType(),
89			Id: request.GetSubject().GetId(),
90			},
91			Relation: entrance.TargetEntrance.GetRelation(),
92			}, visits, g, publisher)
93			if err != nil {
94			return err
95			}
96			case schema.TupleToUserSetLinkedEntrance: // If the linked entrance is a tuple to user set entrance.
97			err = engine.tupleToUserSetEntrance(cont, request, entrance, visits, g, publisher) // Call the tuple to user set entrance method.
98			if err != nil {
99			return err
100			}
101			default:
102			return errors.New("unknown linked entrance type") // Return an error if the linked entrance is of an unknown type.
103			}
104			}
105
106			return g.Wait() // Wait for all goroutines in the errgroup to complete and return any errors that occur.
107			}
108
109			// relationEntrance is a method of the EntityFilterEngine struct. It handles relation entrances.
110			func (engine *SchemaBasedEntityFilter) relationEntrance(
111			ctx context.Context, // A context used for tracing and cancellation.
112			request *base.PermissionEntityFilterRequest, // A permission request for linked entities.
113			entrance *schema.LinkedEntrance, // A linked entrance.
114			visits *ERMap, // A map that keeps track of visited entities to avoid infinite loops.
115			g *errgroup.Group, // An errgroup used for executing goroutines.
116			publisher *BulkEntityPublisher, // A custom publisher that publishes results in bulk.
117			) error { // Returns an error if one occurs during execution.
118			// Define a TupleFilter. This specifies which tuples we're interested in.
119			// We want tuples that match the entity type and ID from the request, and have a specific relation.
120			filter := &base.TupleFilter{
121			Entity: &base.EntityFilter{
122			Type: entrance.TargetEntrance.GetType(),
123			Ids: []string{},
124			},
125			Relation: entrance.TargetEntrance.GetRelation(),
126			Subject: &base.SubjectFilter{
127			Type: request.GetSubject().GetType(),
128			Ids: []string{request.GetSubject().GetId()},
129			Relation: request.GetSubject().GetRelation(),
130			},
131			}
132
133			var (
134			cti, rit *database.TupleIterator
135			err error
136			pagination database.CursorPagination
137			)
138
139			// Determine the pagination settings based on the entity type in the request.
140			// If the entity type matches the target entrance, use cursor pagination with sorting by "entity_id".
141			// Otherwise, use the default pagination settings.
142			if request.GetEntityReference().GetType() == entrance.TargetEntrance.GetType() {
143			pagination = database.NewCursorPagination(database.Cursor(request.GetCursor()), database.Sort("entity_id"))
144			} else {
145			pagination = database.NewCursorPagination()
146			}
147
148			// Query the relationships using the specified pagination settings.
149			// The context tuples are filtered based on the provided filter.
150			cti, err = storageContext.NewContextualTuples(request.GetContext().GetTuples()...).QueryRelationships(filter, pagination)
151			if err != nil {
152			return err
153			}
154
155			// Query the relationships for the entity in the request.
156			// The results are filtered based on the provided filter and pagination settings.
157			rit, err = engine.dataReader.QueryRelationships(ctx, request.GetTenantId(), filter, request.GetMetadata().GetSnapToken(), pagination)
158			if err != nil {
159			return err
160			}
161
162			// Create a new UniqueTupleIterator from the two TupleIterators.
163			// NewUniqueTupleIterator() ensures that the iterator only returns unique tuples.
164			it := database.NewUniqueTupleIterator(rit, cti)
165
166			for it.HasNext() { // Loop over each relationship.
167			// Get the next tuple's subject.
168			current, ok := it.GetNext()
169			if !ok {
170			break
171			}
172			g.Go(func() error {
173			return engine.l(ctx, request, &base.EntityAndRelation{ // Call the run method with a new entity and relation.
174			Entity: &base.Entity{
175			Type: current.GetEntity().GetType(),
176			Id: current.GetEntity().GetId(),
177			},
178			Relation: current.GetRelation(),
179			}, visits, g, publisher)
180			})
181			}
182			return nil
183			}
184
185			// tupleToUserSetEntrance is a method of the EntityFilterEngine struct. It handles tuple to user set entrances.
186			func (engine *SchemaBasedEntityFilter) tupleToUserSetEntrance(
187			// A context used for tracing and cancellation.
188			ctx context.Context,
189			// A permission request for linked entities.
190			request *base.PermissionEntityFilterRequest,
191			// A linked entrance.
192			entrance *schema.LinkedEntrance,
193			// A map that keeps track of visited entities to avoid infinite loops.
194			visits *ERMap,
195			// An errgroup used for executing goroutines.
196			g *errgroup.Group,
197			// A custom publisher that publishes results in bulk.
198			publisher *BulkEntityPublisher,
199			) error { // Returns an error if one occurs during execution.
200			for _, relation := range []string{"", tuple.ELLIPSIS} {
201			// Define a TupleFilter. This specifies which tuples we're interested in.
202			// We want tuples that match the entity type and ID from the request, and have a specific relation.
203			filter := &base.TupleFilter{
204			Entity: &base.EntityFilter{
205			Type: entrance.TargetEntrance.GetType(),
206			Ids: []string{},
207			},
208			Relation: entrance.TupleSetRelation, // Query for relationships that match the tuple set relation.
209			Subject: &base.SubjectFilter{
210			Type: request.GetSubject().GetType(),
211			Ids: []string{request.GetSubject().GetId()},
212			Relation: relation,
213			},
214			}
215
216			var (
217			cti, rit *database.TupleIterator
218			err error
219			pagination database.CursorPagination
220			)
221
222			// Determine the pagination settings based on the entity type in the request.
223			// If the entity type matches the target entrance, use cursor pagination with sorting by "entity_id".
224			// Otherwise, use the default pagination settings.
225			if request.GetEntityReference().GetType() == entrance.TargetEntrance.GetType() {
226			pagination = database.NewCursorPagination(database.Cursor(request.GetCursor()), database.Sort("entity_id"))
227			} else {
228			pagination = database.NewCursorPagination()
229			}
230
231			// Query the relationships using the specified pagination settings.
232			// The context tuples are filtered based on the provided filter.
233			cti, err = storageContext.NewContextualTuples(request.GetContext().GetTuples()...).QueryRelationships(filter, pagination)
234			if err != nil {
235			return err
236			}
237
238			// Query the relationships for the entity in the request.
239			// The results are filtered based on the provided filter and pagination settings.
240			rit, err = engine.dataReader.QueryRelationships(ctx, request.GetTenantId(), filter, request.GetMetadata().GetSnapToken(), pagination)
241			if err != nil {
242			return err
243			}
244
245			// Create a new UniqueTupleIterator from the two TupleIterators.
246			// NewUniqueTupleIterator() ensures that the iterator only returns unique tuples.
247			it := database.NewUniqueTupleIterator(rit, cti)
248
249			for it.HasNext() { // Loop over each relationship.
250			// Get the next tuple's subject.
251			current, ok := it.GetNext()
252			if !ok {
253			break
254			}
255			g.Go(func() error {
256			return engine.l(ctx, request, &base.EntityAndRelation{ // Call the run method with a new entity and relation.
257			Entity: &base.Entity{
258			Type: entrance.TargetEntrance.GetType(),
259			Id: current.GetEntity().GetId(),
260			},
261			Relation: entrance.TargetEntrance.GetRelation(),
262			}, visits, g, publisher)
263			})
264			}
265			}
266			return nil
267			}
268
269			// run is a method of the EntityFilterEngine struct. It executes the linked entity engine for a given request.
270			func (engine *SchemaBasedEntityFilter) l(
271			ctx context.Context, // A context used for tracing and cancellation.
272			request *base.PermissionEntityFilterRequest, // A permission request for linked entities.
273			found *base.EntityAndRelation, // An entity and relation that was previously found.
274			visits *ERMap, // A map that keeps track of visited entities to avoid infinite loops.
275			g *errgroup.Group, // An errgroup used for executing goroutines.
276			publisher *BulkEntityPublisher, // A custom publisher that publishes results in bulk.
277			) error { // Returns an error if one occurs during execution.
278			if !visits.Add(found.GetEntity(), found.GetRelation()) { // If the entity and relation has already been visited.
279			return nil
280			}
281
282			var err error
283
284			// Retrieve linked entrances
285			cn := schema.NewLinkedGraph(engine.schema)
286			var entrances []*schema.LinkedEntrance
287			entrances, err = cn.RelationshipLinkedEntrances(
288			&base.RelationReference{
289			Type: request.GetEntityReference().GetType(),
290			Relation: request.GetEntityReference().GetRelation(),
291			},
292			&base.RelationReference{
293			Type: request.GetSubject().GetType(),
294			Relation: request.GetSubject().GetRelation(),
295			},
296			) // Retrieve the linked entrances for the request.
297			if err != nil {
298			return err
299			}
300
301			if entrances == nil { // If there are no linked entrances for the request.
302			if found.GetEntity().GetType() == request.GetEntityReference().GetType() && found.GetRelation() == request.GetEntityReference().GetRelation() { // Check if the found entity matches the requested entity reference.
303			publisher.Publish(found.GetEntity(), &base.PermissionCheckRequestMetadata{ // Publish the found entity with the permission check metadata.
304			SnapToken: request.GetMetadata().GetSnapToken(),
305			SchemaVersion: request.GetMetadata().GetSchemaVersion(),
306			Depth: request.GetMetadata().GetDepth(),
307			}, request.GetContext(), base.CheckResult_CHECK_RESULT_UNSPECIFIED)
308			return nil
309			}
310			return nil // Otherwise, return without publishing any results.
311			}
312
313			g.Go(func() error {
314			return engine.EntityFilter(ctx, &base.PermissionEntityFilterRequest{ // Call the Run method recursively with a new permission request.
315			TenantId: request.GetTenantId(),
316			EntityReference: request.GetEntityReference(),
317			Subject: &base.Subject{
318			Type: found.GetEntity().GetType(),
319			Id: found.GetEntity().GetId(),
320			Relation: found.GetRelation(),
321			},
322			Metadata: request.GetMetadata(),
323			Context: request.GetContext(),
324			Cursor: request.GetCursor(),
325			}, visits, publisher)
326			})
327			return nil
328			}
329

Permify / permify

Push — master ( 395fc4...2cecfe )

rSetEntrance C

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Long Method

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