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import { QueryBuilder } from './QueryBuilder';
import { QueryCondition } from '../types/queries';
import { StoreType } from '../types/framework';
import { QueryOptimizer, QueryPlan } from './QueryOptimizer';
export class QueryExecutor<T extends BaseModel> {
private model: typeof BaseModel;
private query: QueryBuilder<T>;
private framework: any; // Will be properly typed later
private queryPlan?: QueryPlan;
private useCache: boolean = true;
constructor(model: typeof BaseModel, query: QueryBuilder<T>) {
this.model = model;
this.query = query;
this.framework = this.getFrameworkInstance();
}
async execute(): Promise<T[]> {
const startTime = Date.now();
console.log(`🔍 Executing query for ${this.model.name} (${this.model.scope})`);
// Generate query plan for optimization
this.queryPlan = QueryOptimizer.analyzeQuery(this.query);
console.log(
`📊 Query plan: ${this.queryPlan.strategy} (cost: ${this.queryPlan.estimatedCost})`,
);
// Check cache first if enabled
if (this.useCache && this.framework.queryCache) {
const cached = await this.framework.queryCache.get(this.query);
if (cached) {
console.log(`⚡ Cache hit for ${this.model.name} query`);
return cached;
}
}
// Execute query based on scope
let results: T[];
if (this.model.scope === 'user') {
results = await this.executeUserScopedQuery();
} else {
results = await this.executeGlobalQuery();
}
// Cache results if enabled
if (this.useCache && this.framework.queryCache && results.length > 0) {
this.framework.queryCache.set(this.query, results);
}
const duration = Date.now() - startTime;
console.log(`✅ Query completed in ${duration}ms, returned ${results.length} results`);
return results;
}
async count(): Promise<number> {
const results = await this.execute();
return results.length;
}
async sum(field: string): Promise<number> {
const results = await this.execute();
return results.reduce((sum, item) => {
const value = this.getNestedValue(item, field);
return sum + (typeof value === 'number' ? value : 0);
}, 0);
}
async avg(field: string): Promise<number> {
const results = await this.execute();
if (results.length === 0) return 0;
const sum = await this.sum(field);
return sum / results.length;
}
async min(field: string): Promise<any> {
const results = await this.execute();
if (results.length === 0) return null;
return results.reduce((min, item) => {
const value = this.getNestedValue(item, field);
return min === null || value < min ? value : min;
}, null);
}
async max(field: string): Promise<any> {
const results = await this.execute();
if (results.length === 0) return null;
return results.reduce((max, item) => {
const value = this.getNestedValue(item, field);
return max === null || value > max ? value : max;
}, null);
}
private async executeUserScopedQuery(): Promise<T[]> {
const conditions = this.query.getConditions();
// Check if we have user-specific filters
const userFilter = conditions.find((c) => c.field === 'userId' || c.operator === 'userIn');
if (userFilter) {
return await this.executeUserSpecificQuery(userFilter);
} else {
// Global query on user-scoped data - use global index
return await this.executeGlobalIndexQuery();
}
}
private async executeUserSpecificQuery(userFilter: QueryCondition): Promise<T[]> {
const userIds = userFilter.operator === 'userIn' ? userFilter.value : [userFilter.value];
console.log(`👤 Querying user databases for ${userIds.length} users`);
const results: T[] = [];
// Query each user's database in parallel
const promises = userIds.map(async (userId: string) => {
try {
const userDB = await this.framework.databaseManager.getUserDatabase(
userId,
this.model.modelName,
);
return await this.queryDatabase(userDB, this.model.dbType);
} catch (error) {
console.warn(`Failed to query user ${userId} database:`, error);
return [];
}
});
const userResults = await Promise.all(promises);
// Flatten and combine results
for (const userResult of userResults) {
results.push(...userResult);
}
return this.postProcessResults(results);
}
private async executeGlobalIndexQuery(): Promise<T[]> {
console.log(`📇 Querying global index for ${this.model.name}`);
// Query global index for user-scoped models
const globalIndexName = `${this.model.modelName}GlobalIndex`;
const indexShards = this.framework.shardManager.getAllShards(globalIndexName);
if (!indexShards || indexShards.length === 0) {
console.warn(`No global index found for ${this.model.name}, falling back to all users query`);
return await this.executeAllUsersQuery();
}
const indexResults: any[] = [];
// Query all index shards in parallel
const promises = indexShards.map((shard: any) =>
this.queryDatabase(shard.database, 'keyvalue'),
);
const shardResults = await Promise.all(promises);
for (const shardResult of shardResults) {
indexResults.push(...shardResult);
}
// Now fetch actual documents from user databases
return await this.fetchActualDocuments(indexResults);
}
private async executeAllUsersQuery(): Promise<T[]> {
// This is a fallback for when global index is not available
// It's expensive but ensures completeness
console.warn(`⚠️ Executing expensive all-users query for ${this.model.name}`);
// This would require getting all user IDs from the directory
// For now, return empty array and log warning
console.warn('All-users query not implemented - please ensure global indexes are set up');
return [];
}
private async executeGlobalQuery(): Promise<T[]> {
// For globally scoped models
if (this.model.sharding) {
return await this.executeShardedQuery();
} else {
const db = await this.framework.databaseManager.getGlobalDatabase(this.model.modelName);
return await this.queryDatabase(db, this.model.dbType);
}
}
private async executeShardedQuery(): Promise<T[]> {
console.log(`🔀 Executing sharded query for ${this.model.name}`);
const conditions = this.query.getConditions();
const shardingConfig = this.model.sharding!;
// Check if we can route to specific shard(s)
const shardKeyCondition = conditions.find((c) => c.field === shardingConfig.key);
if (shardKeyCondition && shardKeyCondition.operator === '=') {
// Single shard query
const shard = this.framework.shardManager.getShardForKey(
this.model.modelName,
shardKeyCondition.value,
);
return await this.queryDatabase(shard.database, this.model.dbType);
} else if (shardKeyCondition && shardKeyCondition.operator === 'in') {
// Multiple specific shards
const results: T[] = [];
const shardKeys = shardKeyCondition.value;
const shardQueries = shardKeys.map(async (key: string) => {
const shard = this.framework.shardManager.getShardForKey(this.model.modelName, key);
return await this.queryDatabase(shard.database, this.model.dbType);
});
const shardResults = await Promise.all(shardQueries);
for (const shardResult of shardResults) {
results.push(...shardResult);
}
return this.postProcessResults(results);
} else {
// Query all shards
const results: T[] = [];
const allShards = this.framework.shardManager.getAllShards(this.model.modelName);
const promises = allShards.map((shard: any) =>
this.queryDatabase(shard.database, this.model.dbType),
);
const shardResults = await Promise.all(promises);
for (const shardResult of shardResults) {
results.push(...shardResult);
}
return this.postProcessResults(results);
}
}
private async queryDatabase(database: any, dbType: StoreType): Promise<T[]> {
// Get all documents from OrbitDB based on database type
let documents: any[];
try {
documents = await this.framework.databaseManager.getAllDocuments(database, dbType);
} catch (error) {
console.error(`Error querying ${dbType} database:`, error);
return [];
}
// Apply filters in memory
documents = this.applyFilters(documents);
// Apply sorting
documents = this.applySorting(documents);
// Apply limit/offset
documents = this.applyLimitOffset(documents);
// Convert to model instances
const ModelClass = this.model as any; // Type assertion for abstract class
return documents.map((doc) => new ModelClass(doc) as T);
}
private async fetchActualDocuments(indexResults: any[]): Promise<T[]> {
console.log(`📄 Fetching ${indexResults.length} documents from user databases`);
const results: T[] = [];
// Group by userId for efficient database access
const userGroups = new Map<string, any[]>();
for (const indexEntry of indexResults) {
const userId = indexEntry.userId;
if (!userGroups.has(userId)) {
userGroups.set(userId, []);
}
userGroups.get(userId)!.push(indexEntry);
}
// Fetch documents from each user's database
const promises = Array.from(userGroups.entries()).map(async ([userId, entries]) => {
try {
const userDB = await this.framework.databaseManager.getUserDatabase(
userId,
this.model.modelName,
);
const userResults: T[] = [];
// Fetch specific documents by ID
for (const entry of entries) {
try {
const doc = await this.getDocumentById(userDB, this.model.dbType, entry.id);
if (doc) {
const ModelClass = this.model as any; // Type assertion for abstract class
userResults.push(new ModelClass(doc) as T);
}
} catch (error) {
console.warn(`Failed to fetch document ${entry.id} from user ${userId}:`, error);
}
}
return userResults;
} catch (error) {
console.warn(`Failed to access user ${userId} database:`, error);
return [];
}
});
const userResults = await Promise.all(promises);
// Flatten results
for (const userResult of userResults) {
results.push(...userResult);
}
return this.postProcessResults(results);
}
private async getDocumentById(database: any, dbType: StoreType, id: string): Promise<any | null> {
try {
switch (dbType) {
case 'keyvalue':
return await database.get(id);
case 'docstore':
return await database.get(id);
case 'eventlog':
case 'feed':
// For append-only stores, we need to search through entries
const iterator = database.iterator();
const entries = iterator.collect();
return (
entries.find((entry: any) => entry.payload?.value?.id === id)?.payload?.value || null
);
default:
return null;
}
} catch (error) {
console.warn(`Error fetching document ${id} from ${dbType}:`, error);
return null;
}
}
private applyFilters(documents: any[]): any[] {
const conditions = this.query.getConditions();
return documents.filter((doc) => {
return conditions.every((condition) => {
return this.evaluateCondition(doc, condition);
});
});
}
private evaluateCondition(doc: any, condition: QueryCondition): boolean {
const { field, operator, value } = condition;
// Handle special operators
if (operator === 'or') {
return value.some((subCondition: QueryCondition) =>
this.evaluateCondition(doc, subCondition),
);
}
if (field === '__raw__') {
// Raw conditions would need custom evaluation
console.warn('Raw conditions not fully implemented');
return true;
}
const docValue = this.getNestedValue(doc, field);
switch (operator) {
case '=':
case '==':
return docValue === value;
case '!=':
case '<>':
return docValue !== value;
case '>':
return docValue > value;
case '>=':
case 'gte':
return docValue >= value;
case '<':
return docValue < value;
case '<=':
case 'lte':
return docValue <= value;
case 'in':
return Array.isArray(value) && value.includes(docValue);
case 'not_in':
return Array.isArray(value) && !value.includes(docValue);
case 'contains':
return Array.isArray(docValue) && docValue.includes(value);
case 'like':
return String(docValue).toLowerCase().includes(String(value).toLowerCase());
case 'ilike':
return String(docValue).toLowerCase().includes(String(value).toLowerCase());
case 'is_null':
return docValue === null || docValue === undefined;
case 'is_not_null':
return docValue !== null && docValue !== undefined;
case 'between':
return Array.isArray(value) && docValue >= value[0] && docValue <= value[1];
case 'array_contains':
return Array.isArray(docValue) && docValue.includes(value);
case 'array_length_=':
return Array.isArray(docValue) && docValue.length === value;
case 'array_length_>':
return Array.isArray(docValue) && docValue.length > value;
case 'array_length_<':
return Array.isArray(docValue) && docValue.length < value;
case 'object_has_key':
return typeof docValue === 'object' && docValue !== null && value in docValue;
case 'date_=':
return this.compareDates(docValue, '=', value);
case 'date_>':
return this.compareDates(docValue, '>', value);
case 'date_<':
return this.compareDates(docValue, '<', value);
case 'date_between':
return (
this.compareDates(docValue, '>=', value[0]) && this.compareDates(docValue, '<=', value[1])
);
case 'year':
return this.getDatePart(docValue, 'year') === value;
case 'month':
return this.getDatePart(docValue, 'month') === value;
case 'day':
return this.getDatePart(docValue, 'day') === value;
default:
console.warn(`Unsupported operator: ${operator}`);
return true;
}
}
private compareDates(docValue: any, operator: string, compareValue: any): boolean {
const docDate = this.normalizeDate(docValue);
const compDate = this.normalizeDate(compareValue);
if (!docDate || !compDate) return false;
switch (operator) {
case '=':
return docDate.getTime() === compDate.getTime();
case '>':
return docDate.getTime() > compDate.getTime();
case '<':
return docDate.getTime() < compDate.getTime();
case '>=':
return docDate.getTime() >= compDate.getTime();
case '<=':
return docDate.getTime() <= compDate.getTime();
default:
return false;
}
}
private normalizeDate(value: any): Date | null {
if (value instanceof Date) return value;
if (typeof value === 'number') return new Date(value);
if (typeof value === 'string') return new Date(value);
return null;
}
private getDatePart(value: any, part: 'year' | 'month' | 'day'): number | null {
const date = this.normalizeDate(value);
if (!date) return null;
switch (part) {
case 'year':
return date.getFullYear();
case 'month':
return date.getMonth() + 1; // 1-based month
case 'day':
return date.getDate();
default:
return null;
}
}
private applySorting(documents: any[]): any[] {
const sorting = this.query.getSorting();
if (sorting.length === 0) {
return documents;
}
return documents.sort((a, b) => {
for (const sort of sorting) {
const aValue = this.getNestedValue(a, sort.field);
const bValue = this.getNestedValue(b, sort.field);
let comparison = 0;
if (aValue < bValue) comparison = -1;
else if (aValue > bValue) comparison = 1;
if (comparison !== 0) {
return sort.direction === 'desc' ? -comparison : comparison;
}
}
return 0;
});
}
private applyLimitOffset(documents: any[]): any[] {
const limit = this.query.getLimit();
const offset = this.query.getOffset();
let result = documents;
if (offset && offset > 0) {
result = result.slice(offset);
}
if (limit && limit > 0) {
result = result.slice(0, limit);
}
return result;
}
private postProcessResults(results: T[]): T[] {
// Apply global sorting across all results
results = this.applySorting(results);
// Apply global limit/offset
results = this.applyLimitOffset(results);
return results;
}
private getNestedValue(obj: any, path: string): any {
if (!path) return obj;
const keys = path.split('.');
let current = obj;
for (const key of keys) {
if (current === null || current === undefined) {
return undefined;
}
current = current[key];
}
return current;
}
// Public methods for query control
disableCache(): this {
this.useCache = false;
return this;
}
enableCache(): this {
this.useCache = true;
return this;
}
getQueryPlan(): QueryPlan | undefined {
return this.queryPlan;
}
explain(): any {
const plan = this.queryPlan || QueryOptimizer.analyzeQuery(this.query);
const suggestions = QueryOptimizer.suggestOptimizations(this.query);
return {
query: this.query.explain(),
plan,
suggestions,
estimatedResultSize: QueryOptimizer.estimateResultSize(this.query),
};
}
private getFrameworkInstance(): any {
const framework = (globalThis as any).__debrosFramework;
if (!framework) {
throw new Error('Framework not initialized. Call framework.initialize() first.');
}
return framework;
}
}
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