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package balancer |
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import ( |
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"context" |
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"fmt" |
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"log/slog" |
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"time" |
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"google.golang.org/grpc" |
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"google.golang.org/grpc/credentials" |
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"google.golang.org/grpc/credentials/insecure" |
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"github.com/Permify/permify/internal/config" |
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"github.com/Permify/permify/internal/engines" |
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"github.com/Permify/permify/internal/invoke" |
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"github.com/Permify/permify/internal/storage" |
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"github.com/Permify/permify/pkg/balancer" |
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base "github.com/Permify/permify/pkg/pb/base/v1" |
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) |
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// Balancer is a wrapper around the balancer hash implementation that |
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type Balancer struct { |
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schemaReader storage.SchemaReader |
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checker invoke.Check |
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client base.PermissionClient |
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} |
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// NewCheckEngineWithBalancer creates a new check engine with a load balancer. |
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// It takes a Check interface, SchemaReader, distributed config, gRPC config, and authn config as input. |
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// It returns a Check interface and an error if any. |
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func NewCheckEngineWithBalancer( |
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ctx context.Context, |
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checker invoke.Check, |
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schemaReader storage.SchemaReader, |
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no string, |
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dst *config.Distributed, |
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srv *config.GRPC, |
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authn *config.Authn, |
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) (invoke.Check, error) { |
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var ( |
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creds credentials.TransportCredentials |
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options []grpc.DialOption |
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isSecure bool |
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err error |
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) |
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// Set up TLS credentials if paths are provided |
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if srv.TLSConfig.Enabled && srv.TLSConfig.CertPath != "" { |
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isSecure = true |
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creds, err = credentials.NewClientTLSFromFile(srv.TLSConfig.CertPath, no) |
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if err != nil { |
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return nil, fmt.Errorf("could not load TLS certificate: %w", err) |
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} |
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} else { |
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creds = insecure.NewCredentials() |
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} |
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bc := &balancer.Config{ |
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PartitionCount: dst.PartitionCount, |
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ReplicationFactor: dst.ReplicationFactor, |
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Load: dst.Load, |
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PickerWidth: dst.PickerWidth, |
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} |
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bcjson, err := bc.ServiceConfigJSON() |
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if err != nil { |
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return nil, err |
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} |
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// Append common options |
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options = append( |
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options, |
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grpc.WithDefaultServiceConfig(bcjson), |
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grpc.WithTransportCredentials(creds), |
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) |
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// Handle authentication if enabled |
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if authn != nil && authn.Enabled { |
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token, err := setupAuthn(ctx, authn) |
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if err != nil { |
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return nil, err |
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} |
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if isSecure { |
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options = append(options, grpc.WithPerRPCCredentials(secureTokenCredentials{"authorization": "Bearer " + token})) |
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} else { |
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options = append(options, grpc.WithPerRPCCredentials(nonSecureTokenCredentials{"authorization": "Bearer " + token})) |
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} |
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} |
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conn, err := grpc.NewClient(dst.Address, options...) |
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if err != nil { |
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return nil, err |
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} |
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return &Balancer{ |
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schemaReader: schemaReader, |
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checker: checker, |
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client: base.NewPermissionClient(conn), |
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}, nil |
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} |
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// Check performs a permission check using the schema reader to obtain |
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// entity definitions, then distributes the request based on a generated key. |
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func (c *Balancer) Check(ctx context.Context, request *base.PermissionCheckRequest) (*base.PermissionCheckResponse, error) { |
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// Fetch the EntityDefinition for the given tenant, entity type, and schema version. |
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en, _, err := c.schemaReader.ReadEntityDefinition(ctx, request.GetTenantId(), request.GetEntity().GetType(), request.GetMetadata().GetSchemaVersion()) |
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if err != nil { |
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slog.ErrorContext(ctx, err.Error()) |
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// If an error occurs while reading the entity definition, deny permission and return the error. |
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return &base.PermissionCheckResponse{ |
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Can: base.CheckResult_CHECK_RESULT_DENIED, |
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Metadata: &base.PermissionCheckResponseMetadata{ |
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CheckCount: 0, |
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}, |
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}, err |
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} |
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isRelational := engines.IsRelational(en, request.GetPermission()) |
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// Add a timeout of 2 seconds to the context and also set the generated key as a value. |
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withTimeout, cancel := context.WithTimeout(context.WithValue(ctx, balancer.Key, []byte(engines.GenerateKey(request, isRelational))), 4*time.Second) |
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defer cancel() |
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// Logging the intention to forward the request to the underlying client. |
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slog.InfoContext(ctx, "Forwarding request with key to the underlying client") |
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// Perform the actual permission check by making a call to the underlying client. |
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response, err := c.client.Check(withTimeout, request) |
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if err != nil { |
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// Log the error and return it. |
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slog.ErrorContext(ctx, err.Error()) |
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return &base.PermissionCheckResponse{ |
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Can: base.CheckResult_CHECK_RESULT_DENIED, |
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Metadata: &base.PermissionCheckResponseMetadata{ |
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CheckCount: 0, |
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}, |
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}, err |
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} |
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// Return the response received from the client. |
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return response, nil |
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} |
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Permify /
permify
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