Add a property service

internal/entities/properties/service/service.go

@@ -0,0 +1,267 @@
+//
+// Copyright 2024 Stacklok, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package service provides a service to interact with properties of an entity
+package service
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"time"
+
+	"github.com/google/uuid"
+
+	"github.com/stacklok/minder/internal/db"
+	"github.com/stacklok/minder/internal/entities/properties"
+	minderv1 "github.com/stacklok/minder/pkg/api/protobuf/go/minder/v1"
+	v1 "github.com/stacklok/minder/pkg/providers/v1"
+)
+
+const (
+	// propertiesCacheTimeout is the default timeout for the cache of properties
+	propertiesCacheTimeout = 60
+	// bypassCacheTimeout is a special value to bypass the cache timeout
+	// it is not exported from the package and should only be used for testing
+	bypassCacheTimeout = -1
+)
+
+// PropertiesService is the interface for the properties service
+type PropertiesService interface {
+	// RetrieveAllProperties fetches all properties for the given entity
+	RetrieveAllProperties(context.Context, v1.Provider, uuid.UUID, string, minderv1.Entity) (*properties.Properties, error)
+	// RetrieveProperty fetches a single property for the given entity
+	RetrieveProperty(context.Context, v1.Provider, uuid.UUID, string, minderv1.Entity, string) (*properties.Property, error)
+	// SaveAllProperties saves all properties for the given entity
+	SaveAllProperties(context.Context, uuid.UUID, *properties.Properties) error
+	// SaveProperty saves a single property for the given entity
+	SaveProperty(context.Context, uuid.UUID, string, *properties.Property) error
+}
+
+type propertiesServiceOption func(*propertiesService)
+
+type propertiesService struct {
+	store         db.Store
+	entityTimeout time.Duration
+}
+
+// WithEntityTimeout sets the timeout for the cache of properties
+func WithEntityTimeout(timeout time.Duration) propertiesServiceOption {
+	return func(ps *propertiesService) {
+		ps.entityTimeout = timeout
+	}
+}
+
+// NewPropertiesService creates a new properties service
+func NewPropertiesService(
+	store db.Store,
+	opts ...propertiesServiceOption,
+) PropertiesService {
+	ps := &propertiesService{
+		store:         store,
+		entityTimeout: propertiesCacheTimeout * time.Second,
+	}
+
+	for _, opt := range opts {
+		opt(ps)
+	}
+
+	return ps
+}
+
+// RetrieveAllProperties fetches a single property for the given entity
+func (ps *propertiesService) RetrieveAllProperties(
+	ctx context.Context,
+	provider v1.Provider,
+	projectId uuid.UUID,
+	name string,
+	entType minderv1.Entity,
+) (*properties.Properties, error) {
+	// fetch the entity first. If there's no entity, there's no properties, go straight to provider
+	ent, err := ps.store.GetEntityByName(ctx, db.GetEntityByNameParams{
+		ProjectID: projectId,
+		Name:      name,
+	})
+	if err != nil && !errors.Is(err, sql.ErrNoRows) {
+		return nil, err
+	}
+
+	var dbProps []db.Property
+	if ent.ID != uuid.Nil {
+		// fetch properties from db
+		dbProps, err = ps.store.GetAllPropertiesForEntity(ctx, ent.ID)
+		if err != nil && !errors.Is(err, sql.ErrNoRows) {
+			return nil, err
+		}
+	}
+
+	// if exists and not expired, turn into our model
+	if len(dbProps) > 0 && ps.areDatabasePropertiesValid(dbProps) {
+		// TODO: instead of a hard error, should we just re-fetch from provider?
+		return dbPropsToModel(dbProps)
+	}
+
+	// if not, fetch from provider
+	props, err := provider.FetchAllProperties(ctx, name, entType)
+	if err != nil {
+		return nil, err
+	}
+
+	return props, nil
+}
+
+// RetrieveProperty fetches a single property for the given entity
+func (ps *propertiesService) RetrieveProperty(
+	ctx context.Context,
+	provider v1.Provider,
+	projectId uuid.UUID,
+	name string,
+	entType minderv1.Entity,
+	key string,
+) (*properties.Property, error) {
+	// fetch the entity first. If there's no entity, there's no properties, go straight to provider
+	ent, err := ps.store.GetEntityByName(ctx, db.GetEntityByNameParams{
+		ProjectID: projectId,
+		Name:      name,
+	})
+	if err != nil && !errors.Is(err, sql.ErrNoRows) {
+		return nil, err
+	}
+
+	// fetch properties from db
+	var dbProp db.Property
+	if ent.ID != uuid.Nil {
+		dbProp, err = ps.store.GetProperty(ctx, db.GetPropertyParams{
+			EntityID: ent.ID,
+			Key:      key,
+		})
+		if err != nil && !errors.Is(err, sql.ErrNoRows) {
+			return nil, err
+		}
+	}
+
+	// if exists, turn into our model
+	if ps.isDatabasePropertyValid(dbProp) {
+		return dbPropToModel(dbProp)
+	}
+
+	// if not, fetch from provider
+	prop, err := provider.FetchProperty(ctx, name, entType, key)
+	if err != nil {
+		return nil, err
+	}
+
+	return prop, nil
+}
+
+func (ps *propertiesService) SaveAllProperties(
+	ctx context.Context, entityID uuid.UUID, props *properties.Properties,
+) error {
+	return ps.store.WithTransactionErr(func(qtx db.ExtendQuerier) error {
+		return replaceProperties(ctx, qtx, entityID, props)
+	})
+}
+
+func replaceProperties(ctx context.Context, txq db.ExtendQuerier, entityID uuid.UUID, props *properties.Properties) error {
+	err := txq.DeleteAllPropertiesForEntity(ctx, entityID)
+	if err != nil {
+		return err
+	}
+
+	for key, prop := range props.Iterate() {
+		_, err := txq.UpsertPropertyValueV1(ctx, db.UpsertPropertyValueV1Params{
+			EntityID: entityID,
+			Key:      key,
+			Value:    prop.RawValue(),
+		})
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (ps *propertiesService) SaveProperty(ctx context.Context, entityID uuid.UUID, key string, prop *properties.Property) error {
+	return ps.store.WithTransactionErr(func(qtx db.ExtendQuerier) error {
+		return upsertProperty(ctx, qtx, entityID, key, prop)
+	})
+}
+
+func upsertProperty(ctx context.Context, dbq db.Querier, entityID uuid.UUID, key string, prop *properties.Property) error {
+	if prop == nil {
+		return dbq.DeleteProperty(ctx, db.DeletePropertyParams{
+			EntityID: entityID,
+			Key:      key,
+		})
+	}
+
+	dbVal, err := db.PropValueToDbV1(prop.RawValue())
+	if err != nil {
+		return err
+	}
+
+	_, err = dbq.UpsertProperty(ctx, db.UpsertPropertyParams{
+		EntityID: entityID,
+		Key:      key,
+		Value:    dbVal,
+	})
+	return err
+}
+
+func (ps *propertiesService) areDatabasePropertiesValid(dbProps []db.Property) bool {
+	// if the all the properties are to be valid, neither must be older than
+	// the cache timeout
+	for _, prop := range dbProps {
+		if !ps.isDatabasePropertyValid(prop) {
+			return false
+		}
+	}
+	return true
+}
+
+func (ps *propertiesService) isDatabasePropertyValid(dbProp db.Property) bool {
+	if ps.entityTimeout == bypassCacheTimeout {
+		// this is mostly for testing
+		return false
+	}
+	return time.Since(dbProp.UpdatedAt) < ps.entityTimeout
+}
+
+func dbPropsToModel(dbProps []db.Property) (*properties.Properties, error) {
+	propMap := make(map[string]any)
+
+	// TODO: should we change the property API to include a Set
+	// and rather move the construction from a map to a separate method?
+	// this double iteration is not ideal
+	for _, prop := range dbProps {
+		anyVal, err := db.PropValueFromDbV1(prop.Value)
+		if err != nil {
+			return nil, err
+		}
+		propMap[prop.Key] = anyVal
+	}
+
+	return properties.NewProperties(propMap)
+}
+
+func dbPropToModel(dbProp db.Property) (*properties.Property, error) {
+	anyVal, err := db.PropValueFromDbV1(dbProp.Value)
+	if err != nil {
+		return nil, err
+	}
+
+	return properties.NewProperty(anyVal)
+}