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import { DatabaseAdapter } from './interface';
import { MetadataRegistry } from '../core/MetadataRegistry';
import { SchemaReflector } from '../core/SchemaReflector';
import { RelationshipOptions } from '../core/types';
/**
* Neo4j-specific node label decorator
*/
export function Labels(labels: string[]) {
return function(target: any) {
Reflect.defineMetadata('neo4j:labels', labels, target);
};
}
/**
* Neo4j-specific relationship type decorator
*/
export function RelationshipType(type: string) {
return function(target: any, propertyKey: string) {
Reflect.defineMetadata('neo4j:relationshipType', type, target, propertyKey);
};
}
/**
* Shorthand decorator for Neo4j entities
*/
export function Neo4j<T extends { new (...args: any[]): any }>(target: T): T {
return DatabaseAdapter('Neo4j')(target);
}
// Mock Neo4j types for testing - these would be replaced with real neo4j-driver in production
interface Neo4jNode {
identity: { toString(): string };
labels: string[];
properties: { [key: string]: any };
}
interface Neo4jRelationship {
identity: { toString(): string };
type: string;
properties: { [key: string]: any };
startNodeId?: { toString(): string };
endNodeId?: { toString(): string };
startNodeIdentity?: { toString(): string };
endNodeIdentity?: { toString(): string };
}
interface Neo4jPath {
segments: Array<{
start: Neo4jNode;
relationship: Neo4jRelationship;
end: Neo4jNode;
}>;
}
interface Neo4jRecord {
keys: string[];
get(key: string): any;
}
interface Neo4jResult {
records: Neo4jRecord[];
summary: {
counters: {
updates(): { [key: string]: number };
};
resultAvailableAfter: number;
resultConsumedAfter: number;
database?: string;
query: {
text: string;
parameters: Record<string, any>;
};
};
}
interface Neo4jTransaction {
run(query: string, params?: Record<string, any>): Promise<Neo4jResult>;
commit(): Promise<void>;
rollback(): Promise<void>;
}
interface Neo4jSession {
run(query: string, params?: Record<string, any>): Promise<Neo4jResult>;
close(): Promise<void>;
beginTransaction(): Neo4jTransaction;
}
interface Neo4jDriver {
session(config?: { defaultAccessMode?: string; database?: string }): Neo4jSession;
verifyConnectivity(): Promise<void>;
close(): Promise<void>;
}
interface Neo4jAuth {
basic(username: string, password: string): { username: string; password: string };
}
/**
* Interface for Neo4j auth configuration
*/
export interface Neo4jAuthConfig {
username: string;
password: string;
}
/**
* Implementation of DatabaseAdapter for Neo4j
*/
export class Neo4jAdapter implements DatabaseAdapter {
readonly type = 'Neo4j';
private registry: MetadataRegistry;
private reflector = new SchemaReflector();
private driver: Neo4jDriver;
private initialized = false;
private neo4j: {
driver: (...args: any[]) => Neo4jDriver;
session: { READ: string; WRITE: string };
auth: Neo4jAuth;
isNode?(value: any): value is Neo4jNode;
isRelationship?(value: any): value is Neo4jRelationship;
isPath?(value: any): value is Neo4jPath;
isDate?(value: any): boolean;
isDateTime?(value: any): boolean;
isTime?(value: any): boolean;
isLocalTime?(value: any): boolean;
isLocalDateTime?(value: any): boolean;
isDuration?(value: any): boolean;
};
/**
* Constructor for Neo4j adapter
* @param registry The metadata registry to use for schema information
* @param connectionString The Neo4j connection string
* @param auth The Neo4j authentication (username/password)
*/
constructor(
registry: MetadataRegistry,
private connectionString: string,
private auth: Neo4jAuthConfig = { username: 'neo4j', password: 'password' }
) {
this.registry = registry;
// Create a mock neo4j object for testing
// In production, this would be replaced with the real neo4j-driver
this.neo4j = {
driver: (url: string, auth: any, config?: any): Neo4jDriver => {
return {
verifyConnectivity: async () => {},
session: (config?: any) => {
return {
run: async (query: string, params?: any): Promise<Neo4jResult> => {
return {
records: [],
summary: {
counters: {
updates: () => ({})
},
resultAvailableAfter: 0,
resultConsumedAfter: 0,
query: {
text: query,
parameters: params || {}
}
}
};
},
close: async () => {},
beginTransaction: () => {
return {
run: async (query: string, params?: any): Promise<Neo4jResult> => {
return {
records: [],
summary: {
counters: {
updates: () => ({})
},
resultAvailableAfter: 0,
resultConsumedAfter: 0,
query: {
text: query,
parameters: params || {}
}
}
};
},
commit: async () => {},
rollback: async () => {}
};
}
};
},
close: async () => {}
};
},
session: {
READ: 'READ',
WRITE: 'WRITE'
},
auth: {
basic: (username: string, password: string) => ({ username, password })
},
// Type checking helpers
isNode: (value: any): value is Neo4jNode =>
value && typeof value === 'object' && value.labels && value.properties,
isRelationship: (value: any): value is Neo4jRelationship =>
value && typeof value === 'object' && value.type && (value.startNodeId || value.startNodeIdentity),
isPath: (value: any): value is Neo4jPath =>
value && typeof value === 'object' && Array.isArray(value.segments),
isDate: (value: any): boolean => false,
isDateTime: (value: any): boolean => false,
isTime: (value: any): boolean => false,
isLocalTime: (value: any): boolean => false,
isLocalDateTime: (value: any): boolean => false,
isDuration: (value: any): boolean => false
};
}
/**
* Initialize the Neo4j connection
*/
private async initialize(): Promise<void> {
if (this.initialized) return;
try {
// In a real implementation, this would use the neo4j-driver package
this.driver = this.neo4j.driver(
this.connectionString,
this.neo4j.auth.basic(this.auth.username, this.auth.password),
{
// Optional configuration
maxConnectionLifetime: 3 * 60 * 60 * 1000, // 3 hours
maxConnectionPoolSize: 50,
connectionAcquisitionTimeout: 30 * 1000, // 30 seconds
disableLosslessIntegers: true // Convert Neo4j integers to JavaScript numbers
}
);
// Verify connectivity
await this.driver.verifyConnectivity();
this.initialized = true;
console.log('[Neo4jAdapter] Successfully connected to Neo4j');
} catch (error) {
console.error('[Neo4jAdapter] Failed to connect to Neo4j:', error);
throw error;
}
}
/**
* Get a Neo4j session with optional transaction mode
* @param mode Session mode (READ or WRITE)
* @returns A Neo4j session
*/
private async getSession(mode: string = this.neo4j.session.WRITE): Promise<Neo4jSession> {
await this.initialize();
return this.driver.session({
defaultAccessMode: mode,
database: 'neo4j' // Use default database, can be configured if needed
});
}
/**
* Build a Cypher query to find an entity by its ID
*/
private buildFindByIdQuery<T>(entityType: Type<T>): string {
const labels = this.getEntityLabels(entityType);
return `MATCH (n:${labels.join(':')} {id: $id}) RETURN n`;
}
/**
* Get all Neo4j labels for an entity
*/
private getEntityLabels<T>(entityType: Type<T>): string[] {
// Get custom labels if defined, otherwise use the entity name
const customLabels = Reflect.getMetadata('neo4j:labels', entityType);
Iif (customLabels && Array.isArray(customLabels)) {
return customLabels;
}
return [entityType.name];
}
/**
* Get relationship type for a property
*/
private getRelationshipType(entityType: Function, propertyKey: string): string {
// Get custom relationship type if defined, otherwise use uppercase property name
const customType = Reflect.getMetadata('neo4j:relationshipType', entityType.prototype, propertyKey);
Iif (customType) {
return customType;
}
// Look for relationship metadata
const relationshipOptions = this.registry.getRelationshipMetadata(entityType, propertyKey);
Iif (relationshipOptions?.name) {
return relationshipOptions.name;
}
return propertyKey.toUpperCase();
}
/**
* Convert Neo4j node to entity instance
*/
private nodeToEntity<T>(entityType: Type<T>, node: any): T {
const entity = new entityType();
// Copy node properties to entity
Iif (node && typeof node === 'object') {
// Handle Neo4j Integer conversions
const properties = node.properties ? { ...node.properties } : {};
Object.keys(properties).forEach(key => {
// Get the property value
let value = properties[key];
// Convert Neo4j date types to JavaScript types if needed
if (this.neo4j.isDate && this.neo4j.isDate(value)) {
value = value.toString(); // or value.toStandardDate() for Date object
} else if (this.neo4j.isDateTime && this.neo4j.isDateTime(value)) {
value = value.toString(); // or value.toStandardDate() for Date object
} else if (this.neo4j.isLocalDateTime && this.neo4j.isLocalDateTime(value)) {
value = value.toString();
} else if (this.neo4j.isLocalTime && this.neo4j.isLocalTime(value)) {
value = value.toString();
} else Iif (this.neo4j.isTime && this.neo4j.isTime(value)) {
value = value.toString();
}
// Assign the converted value to the entity
(entity as any)[key] = value;
});
}
return entity;
}
/**
* Convert entity to Neo4j properties
*/
private entityToProperties<T>(entity: T): { [key: string]: any } {
const entityType = entity.constructor as Type<T>;
const entitySchema = this.reflector.getEntitySchema(entityType);
const properties: { [key: string]: any } = {};
// Convert each property
for (const [key, meta] of Object.entries(entitySchema.properties)) {
Iif ((entity as any)[key] !== undefined) {
const value = (entity as any)[key];
// Handle Date objects (convert to ISO string)
if (value instanceof Date) {
properties[key] = value.toISOString();
} else {
properties[key] = value;
}
}
}
return properties;
}
/**
* Query for a single entity by criteria
*/
async query<T>(entityType: Type<T>, criteria: object): Promise<T | null> {
try {
await this.initialize();
const session = await this.getSession(this.neo4j.session.READ);
try {
const labels = this.getEntityLabels(entityType);
// If criteria includes an ID, use the optimized findById query
if ('id' in criteria) {
const query = this.buildFindByIdQuery(entityType);
const result = await session.run(query, { id: criteria.id });
if (result.records.length === 0) {
return null;
}
const node = result.records[0].get('n');
return this.nodeToEntity(entityType, node);
}
// Otherwise, build a query based on criteria
let whereClause = '';
if (Object.keys(criteria).length > 0) {
const conditions = Object.keys(criteria).map(key => `n.${key} = $${key}`).join(' AND ');
whereClause = `WHERE ${conditions}`;
}
const query = `
MATCH (n:${labels.join(':')})
${whereClause}
RETURN n LIMIT 1
`;
const result = await session.run(query, criteria);
if (result.records.length === 0) {
return null;
}
const node = result.records[0].get('n');
return this.nodeToEntity(entityType, node);
} finally {
await session.close();
}
} catch (error) {
console.error('[Neo4jAdapter] Error in query:', error);
throw error;
}
}
/**
* Query for multiple entities by criteria
*/
async queryMany<T>(entityType: Type<T>, criteria: object): Promise<T[]> {
try {
await this.initialize();
const session = await this.getSession(this.neo4j.session.READ);
try {
const labels = this.getEntityLabels(entityType);
// Build the query based on criteria
let whereClause = '';
if (Object.keys(criteria).length > 0) {
const conditions = Object.keys(criteria).map(key => `n.${key} = $${key}`).join(' AND ');
whereClause = `WHERE ${conditions}`;
}
const query = `
MATCH (n:${labels.join(':')})
${whereClause}
RETURN n
`;
const result = await session.run(query, criteria);
return result.records.map(record => {
const node = record.get('n');
return this.nodeToEntity(entityType, node);
});
} finally {
await session.close();
}
} catch (error) {
console.error('[Neo4jAdapter] Error in queryMany:', error);
throw error;
}
}
/**
* Save an entity to Neo4j
*/
async save<T>(entity: T): Promise<void> {
try {
await this.initialize();
const session = await this.getSession(this.neo4j.session.WRITE);
try {
// Start a transaction for atomicity
const tx = session.beginTransaction();
try {
const entityType = entity.constructor as Type<T>;
const entitySchema = this.reflector.getEntitySchema(entityType);
const labels = this.getEntityLabels(entityType);
// Validate the entity before saving
const validation = this.reflector.validateEntity(entity);
Iif (!validation.valid) {
throw new Error(`Invalid entity: ${validation.errors.join(', ')}`);
}
// Extract properties
const properties = this.entityToProperties(entity);
// Create or update the node
const createNodeQuery = `
MERGE (n:${labels.join(':')} {id: $id})
SET n += $props
RETURN n
`;
await tx.run(createNodeQuery, {
id: properties['id'],
props: properties
});
// Handle relationships
for (const [key, relationshipMetaUntyped] of Object.entries(entitySchema.relationships || {})) {
const relationshipMeta = relationshipMetaUntyped as RelationshipOptions;
const relatedEntity = (entity as any)[key];
Iif (!relatedEntity) continue;
const relationshipType = this.getRelationshipType(entityType, key);
// Handle different relationship cardinalities
if (relationshipMeta.cardinality === 'one') {
// Handle one-to-one or many-to-one relationship
const relatedProperties = this.entityToProperties(relatedEntity);
const relatedLabels = this.getEntityLabels(relationshipMeta.target as Type<any>);
// Create or update the related node first
const createRelatedNodeQuery = `
MERGE (m:${relatedLabels.join(':')} {id: $id})
SET m += $props
RETURN m
`;
await tx.run(createRelatedNodeQuery, {
id: relatedProperties['id'],
props: relatedProperties
});
// Create the relationship
const createRelationshipQuery = `
MATCH (n:${labels.join(':')} {id: $nodeId})
MATCH (m:${relatedLabels.join(':')} {id: $relatedId})
MERGE (n)-[r:${relationshipType}]->(m)
RETURN r
`;
await tx.run(createRelationshipQuery, {
nodeId: properties['id'],
relatedId: relatedProperties['id']
});
} else Iif (relationshipMeta.cardinality === 'many' && Array.isArray(relatedEntity)) {
// Handle one-to-many or many-to-many relationship
// First, delete existing relationships
const deleteRelationshipsQuery = `
MATCH (n:${labels.join(':')} {id: $nodeId})-[r:${relationshipType}]->()
DELETE r
`;
await tx.run(deleteRelationshipsQuery, {
nodeId: properties['id']
});
// Then create nodes and relationships for each related entity
for (const related of relatedEntity) {
const relatedProperties = this.entityToProperties(related);
const relatedLabels = this.getEntityLabels(relationshipMeta.target as Type<any>);
// Create or update the related node
const createRelatedNodeQuery = `
MERGE (m:${relatedLabels.join(':')} {id: $id})
SET m += $props
RETURN m
`;
await tx.run(createRelatedNodeQuery, {
id: relatedProperties['id'],
props: relatedProperties
});
// Create the relationship
const createRelationshipQuery = `
MATCH (n:${labels.join(':')} {id: $nodeId})
MATCH (m:${relatedLabels.join(':')} {id: $relatedId})
MERGE (n)-[r:${relationshipType}]->(m)
RETURN r
`;
await tx.run(createRelationshipQuery, {
nodeId: properties['id'],
relatedId: relatedProperties['id']
});
}
}
}
// Commit the transaction
await tx.commit();
} catch (error) {
// Rollback transaction on error
await tx.rollback();
throw error;
}
} finally {
await session.close();
}
} catch (error) {
console.error('[Neo4jAdapter] Error in save:', error);
throw error;
}
}
/**
* Delete an entity from Neo4j
*/
async delete<T>(entityType: Type<T>, id: string | number): Promise<void> {
try {
await this.initialize();
const session = await this.getSession(this.neo4j.session.WRITE);
try {
const labels = this.getEntityLabels(entityType);
// Delete the node and all its relationships
const query = `
MATCH (n:${labels.join(':')} {id: $id})
DETACH DELETE n
`;
await session.run(query, { id });
} finally {
await session.close();
}
} catch (error) {
console.error('[Neo4jAdapter] Error in delete:', error);
throw error;
}
}
/**
* Execute a raw Cypher query
*/
async runNativeQuery<T = any>(query: string, params?: Record<string, any>): Promise<T> {
try {
await this.initialize();
const session = await this.getSession();
try {
const result = await session.run(query, params);
// Convert Neo4j result to a more usable format
const convertedResult = {
records: result.records.map(record => {
const obj: { [key: string]: any } = {};
for (let i = 0; i < record.keys.length; i++) {
const key = record.keys[i];
// Skip if key is a symbol
Iif (typeof key === 'symbol') continue;
const value = record.get(key);
// Handle Neo4j Node objects
if (value && this.neo4j.isNode && this.neo4j.isNode(value)) {
obj[key] = {
...(value.properties || {}),
_labels: value.labels,
_id: value.identity.toString()
};
}
// Handle Neo4j Relationship objects
else if (value && this.neo4j.isRelationship && this.neo4j.isRelationship(value)) {
// Check what properties are available for the relationship
// Neo4j JS driver has changed property names in different versions
const startId =
(value.startNodeIdentity && value.startNodeIdentity.toString()) ||
(value.startNodeId && value.startNodeId.toString()) ||
"unknown";
const endId =
(value.endNodeIdentity && value.endNodeIdentity.toString()) ||
(value.endNodeId && value.endNodeId.toString()) ||
"unknown";
obj[key] = {
...(value.properties || {}),
_type: value.type,
_id: value.identity.toString(),
_startNodeId: startId,
_endNodeId: endId
};
}
// Handle Neo4j Path objects
else if (value && this.neo4j.isPath && this.neo4j.isPath(value)) {
const segments = [];
Iif (value.segments && Array.isArray(value.segments)) {
for (const segment of value.segments) {
segments.push({
start: {
...(segment.start.properties || {}),
_labels: segment.start.labels,
_id: segment.start.identity.toString()
},
relationship: {
...(segment.relationship.properties || {}),
_type: segment.relationship.type,
_id: segment.relationship.identity.toString()
},
end: {
...(segment.end.properties || {}),
_labels: segment.end.labels,
_id: segment.end.identity.toString()
}
});
}
}
obj[key] = { segments };
}
// Handle other Neo4j types
else if (value && typeof value === 'object' && value.constructor) {
// Handle date/time types
if ((this.neo4j.isDateTime && this.neo4j.isDateTime(value)) ||
(this.neo4j.isDate && this.neo4j.isDate(value)) ||
(this.neo4j.isTime && this.neo4j.isTime(value)) ||
(this.neo4j.isLocalDateTime && this.neo4j.isLocalDateTime(value)) ||
(this.neo4j.isLocalTime && this.neo4j.isLocalTime(value)) ||
(this.neo4j.isDuration && this.neo4j.isDuration(value))) {
obj[key] = value.toString();
} else {
// For other objects, convert to plain object safely
obj[key] = typeof value === 'object' && value !== null ? Object.assign({}, value) : value;
}
} else {
// For primitive values
obj[key] = value;
}
}
return obj;
}),
summary: {
counters: result.summary.counters ? result.summary.counters.updates() : {},
resultAvailableAfter: result.summary.resultAvailableAfter,
resultConsumedAfter: result.summary.resultConsumedAfter,
database: result.summary.database,
query: {
text: result.summary.query.text,
parameters: result.summary.query.parameters
}
}
};
return convertedResult as unknown as T;
} finally {
await session.close();
}
} catch (error) {
console.error('[Neo4jAdapter] Error in runNativeQuery:', error);
throw error;
}
}
/**
* Close the Neo4j driver when done
*/
async close(): Promise<void> {
Iif (this.driver) {
await this.driver.close();
this.initialized = false;
console.log('[Neo4jAdapter] Connection to Neo4j closed');
}
}
} |