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* Hono adapter for Drizzle Cube
* Provides Cube.js-compatible API endpoints for Hono applications with Drizzle ORM
*/
import { Hono } from 'hono'
import { cors } from 'hono/cors'
import type {
SemanticQuery,
SecurityContext,
DatabaseExecutor,
DrizzleDatabase,
Cube,
CacheConfig,
ExplainOptions
} from '../../server'
import { SemanticLayerCompiler } from '../../server/compiler'
import type { PostgresJsDatabase } from 'drizzle-orm/postgres-js'
import type { MySql2Database } from 'drizzle-orm/mysql2'
import type { BetterSQLite3Database } from 'drizzle-orm/better-sqlite3'
import {
handleDryRun,
formatCubeResponse,
formatSqlResponse,
formatMetaResponse,
handleBatchRequest,
type MCPOptions
} from '../utils'
import {
buildJsonRpcError,
buildJsonRpcResult,
dispatchMcpMethod,
getDefaultPrompts,
getDefaultResources,
isNotification,
negotiateProtocol,
parseJsonRpc,
primeEventId,
serializeSseEvent,
wantsEventStream,
validateAcceptHeader,
validateOriginHeader,
MCP_SESSION_ID_HEADER
} from '../mcp-transport'
export interface HonoAdapterOptions {
/**
* Array of cube definitions to register
*/
cubes: Cube[]
/**
* Drizzle database instance (REQUIRED)
* This is the core of drizzle-cube - Drizzle ORM integration
* Accepts PostgreSQL, MySQL, or SQLite database instances
*/
drizzle: PostgresJsDatabase<any> | MySql2Database<any> | BetterSQLite3Database<any> | DrizzleDatabase
/**
* Database schema for type inference (RECOMMENDED)
* Provides full type safety for cube definitions
*/
schema?: any
/**
* Extract security context from incoming HTTP request.
* Called for EVERY API request to determine user permissions and multi-tenant isolation.
*
* This is your security boundary - ensure proper authentication and authorization here.
*
* @param c - Hono context containing the incoming HTTP request
* @returns Security context with organisationId, userId, roles, etc.
*
* @example
* extractSecurityContext: async (c) => {
* // Extract JWT from Authorization header
* const token = c.req.header('Authorization')?.replace('Bearer ', '')
* const decoded = await verifyJWT(token)
*
* // Return context that will be available in all cube SQL functions
* return {
* organisationId: decoded.orgId,
* userId: decoded.userId,
* roles: decoded.roles
* }
* }
*/
extractSecurityContext: (c: any) => SecurityContext | Promise<SecurityContext>
/**
* Database engine type (optional - auto-detected if not provided)
*/
engineType?: 'postgres' | 'mysql' | 'sqlite' | 'singlestore' | 'duckdb'
/**
* CORS configuration (optional)
*/
cors?: {
origin?: string | string[] | ((origin: string, c: any) => string | null | undefined)
allowMethods?: string[]
allowHeaders?: string[]
credentials?: boolean
}
/**
* API base path (default: '/cubejs-api/v1')
*/
basePath?: string
/**
* Cache configuration for query result caching
* When provided, query results will be cached using the specified provider
*/
cache?: CacheConfig
/**
* MCP (AI-Ready) endpoint configuration
* Enables AI agents to discover and query your data
* @default { enabled: true }
*/
mcp?: MCPOptions
}
/**
* Create Hono routes for Cube.js-compatible API
*/
export function createCubeRoutes(
options: HonoAdapterOptions
) {
const {
cubes,
drizzle,
schema,
extractSecurityContext,
engineType,
cors: corsConfig,
basePath = '/cubejs-api/v1',
cache,
mcp = { enabled: true }
} = options
// Validate required options
if (!cubes || cubes.length === 0) {
throw new Error('At least one cube must be provided in the cubes array')
}
const app = new Hono()
// Configure CORS if provided
Iif (corsConfig) {
app.use('/*', cors(corsConfig as any))
}
// Create semantic layer and register all cubes
const semanticLayer = new SemanticLayerCompiler({
drizzle,
schema,
engineType,
cache
})
// Register all provided cubes
cubes.forEach(cube => {
semanticLayer.registerCube(cube)
})
/**
* POST /cubejs-api/v1/load - Execute queries
*/
app.post(`${basePath}/load`, async (c) => {
try {
const requestBody = await c.req.json()
// Handle both direct query and nested query formats
const query: SemanticQuery = requestBody.query || requestBody
// Extract security context using user-provided function
const securityContext = await extractSecurityContext(c)
// Validate query structure and field existence
const validation = semanticLayer.validateQuery(query)
if (!validation.isValid) {
return c.json({
error: `Query validation failed: ${validation.errors.join(', ')}`
}, 400)
}
// Check for cache bypass header (X-Cache-Control: no-cache)
const skipCache = c.req.header('x-cache-control') === 'no-cache'
// Execute multi-cube query (handles both single and multi-cube automatically)
const result = await semanticLayer.executeMultiCubeQuery(query, securityContext, { skipCache })
// Return in official Cube.js format
return c.json(formatCubeResponse(query, result, semanticLayer))
} catch (error) {
console.error('Query execution error:', error)
return c.json({
error: error instanceof Error ? error.message : 'Query execution failed'
}, 500)
}
})
/**
* GET /cubejs-api/v1/load - Execute queries via query string
*/
app.get(`${basePath}/load`, async (c) => {
try {
const queryParam = c.req.query('query')
Iif (!queryParam) {
return c.json({
error: 'Query parameter is required'
}, 400)
}
let query: SemanticQuery
try {
query = JSON.parse(queryParam)
} catch {
return c.json({
error: 'Invalid JSON in query parameter'
}, 400)
}
// Extract security context
const securityContext = await extractSecurityContext(c)
// Validate query structure and field existence
const validation = semanticLayer.validateQuery(query)
Iif (!validation.isValid) {
return c.json({
error: `Query validation failed: ${validation.errors.join(', ')}`
}, 400)
}
// Check for cache bypass header (X-Cache-Control: no-cache)
const skipCache = c.req.header('x-cache-control') === 'no-cache'
// Execute multi-cube query (handles both single and multi-cube automatically)
const result = await semanticLayer.executeMultiCubeQuery(query, securityContext, { skipCache })
// Return in official Cube.js format
return c.json(formatCubeResponse(query, result, semanticLayer))
} catch (error) {
console.error('Query execution error:', error)
return c.json({
error: error instanceof Error ? error.message : 'Query execution failed'
}, 500)
}
})
/**
* POST /cubejs-api/v1/batch - Execute multiple queries in a single request
* Optimizes network overhead for dashboards with many portlets
*/
app.post(`${basePath}/batch`, async (c) => {
try {
const requestBody = await c.req.json()
const { queries } = requestBody as { queries: SemanticQuery[] }
if (!queries || !Array.isArray(queries)) {
return c.json({
error: 'Request body must contain a "queries" array'
}, 400)
}
if (queries.length === 0) {
return c.json({
error: 'Queries array cannot be empty'
}, 400)
}
// Extract security context ONCE (shared across all queries)
const securityContext = await extractSecurityContext(c)
// Check for cache bypass header (X-Cache-Control: no-cache)
const skipCache = c.req.header('x-cache-control') === 'no-cache'
// Use shared batch handler (wraps existing single query logic)
const batchResult = await handleBatchRequest(queries, securityContext, semanticLayer, { skipCache })
return c.json(batchResult)
} catch (error) {
console.error('Batch execution error:', error)
return c.json({
error: error instanceof Error ? error.message : 'Batch execution failed'
}, 500)
}
})
/**
* GET /cubejs-api/v1/meta - Get cube metadata
* Optimized for fast response times with caching
*/
app.get(`${basePath}/meta`, (c) => {
try {
// Extract security context (some apps may want to filter cubes by context)
// await extractSecurityContext(c) // Available if needed for filtering
// Get cached metadata (fast path)
const metadata = semanticLayer.getMetadata()
return c.json(formatMetaResponse(metadata))
} catch (error) {
console.error('Metadata error:', error)
return c.json({
error: error instanceof Error ? error.message : 'Failed to fetch metadata'
}, 500)
}
})
/**
* POST /cubejs-api/v1/sql - Generate SQL without execution (dry run)
*/
app.post(`${basePath}/sql`, async (c) => {
try {
const query: SemanticQuery = await c.req.json()
const securityContext = await extractSecurityContext(c)
// Validate query structure and field existence
const validation = semanticLayer.validateQuery(query)
Iif (!validation.isValid) {
return c.json({
error: `Query validation failed: ${validation.errors.join(', ')}`
}, 400)
}
// For SQL generation, we need at least one cube referenced
const firstMember = query.measures?.[0] || query.dimensions?.[0]
Iif (!firstMember) {
return c.json({
error: 'No measures or dimensions specified'
}, 400)
}
const cubeName = firstMember.split('.')[0]
// Generate SQL using the semantic layer compiler
const sqlResult = await semanticLayer.generateSQL(cubeName, query, securityContext)
return c.json(formatSqlResponse(query, sqlResult))
} catch (error) {
console.error('SQL generation error:', error)
return c.json({
error: error instanceof Error ? error.message : 'SQL generation failed'
}, 500)
}
})
/**
* GET /cubejs-api/v1/sql - Generate SQL via query string
*/
app.get(`${basePath}/sql`, async (c) => {
try {
const queryParam = c.req.query('query')
if (!queryParam) {
return c.json({
error: 'Query parameter is required'
}, 400)
}
const query: SemanticQuery = JSON.parse(queryParam)
const securityContext = await extractSecurityContext(c)
// Validate query structure and field existence
const validation = semanticLayer.validateQuery(query)
Iif (!validation.isValid) {
return c.json({
error: `Query validation failed: ${validation.errors.join(', ')}`
}, 400)
}
// For SQL generation, we need at least one cube referenced
const firstMember = query.measures?.[0] || query.dimensions?.[0]
Iif (!firstMember) {
return c.json({
error: 'No measures or dimensions specified'
}, 400)
}
const cubeName = firstMember.split('.')[0]
// Generate SQL using the semantic layer compiler
const sqlResult = await semanticLayer.generateSQL(cubeName, query, securityContext)
return c.json(formatSqlResponse(query, sqlResult))
} catch (error) {
console.error('SQL generation error:', error)
return c.json({
error: error instanceof Error ? error.message : 'SQL generation failed'
}, 500)
}
})
/**
* POST /cubejs-api/v1/dry-run - Validate queries without execution
*/
app.post(`${basePath}/dry-run`, async (c) => {
try {
const requestBody = await c.req.json()
// Handle both direct query and nested query formats
const query: SemanticQuery = requestBody.query || requestBody
// Extract security context using user-provided function
const securityContext = await extractSecurityContext(c)
// Perform dry-run analysis
const result = await handleDryRun(query, securityContext, semanticLayer)
return c.json(result)
} catch (error) {
console.error('Dry-run error:', error)
return c.json({
error: error instanceof Error ? error.message : 'Dry-run validation failed',
valid: false
}, 400)
}
})
/**
* GET /cubejs-api/v1/dry-run - Validate queries via query string
*/
app.get(`${basePath}/dry-run`, async (c) => {
try {
const queryParam = c.req.query('query')
if (!queryParam) {
return c.json({
error: 'Query parameter is required',
valid: false
}, 400)
}
const query: SemanticQuery = JSON.parse(queryParam)
// Extract security context
const securityContext = await extractSecurityContext(c)
// Perform dry-run analysis
const result = await handleDryRun(query, securityContext, semanticLayer)
return c.json(result)
} catch (error) {
console.error('Dry-run error:', error)
return c.json({
error: error instanceof Error ? error.message : 'Dry-run validation failed',
valid: false
}, 400)
}
})
/**
* POST /cubejs-api/v1/explain - Get execution plan for a query
* Returns normalized EXPLAIN output across PostgreSQL, MySQL, and SQLite
*/
app.post(`${basePath}/explain`, async (c) => {
try {
const requestBody = await c.req.json()
// Handle both direct query and nested query formats
const query: SemanticQuery = requestBody.query || requestBody
const options: ExplainOptions = requestBody.options || {}
// Extract security context
const securityContext = await extractSecurityContext(c)
// Validate query structure
const validation = semanticLayer.validateQuery(query)
if (!validation.isValid) {
return c.json({
error: `Query validation failed: ${validation.errors.join(', ')}`
}, 400)
}
// Execute EXPLAIN using the semantic layer
const explainResult = await semanticLayer.explainQuery(query, securityContext, options)
return c.json(explainResult)
} catch (error) {
console.error('Explain error:', error)
return c.json({
error: error instanceof Error ? error.message : 'Explain query failed'
}, 500)
}
})
// ============================================
// MCP (AI-Ready) Endpoints
// ============================================
Eif (mcp.enabled !== false) {
// Build dynamic MCP resources/prompts (include schema)
const schemaResource = {
uri: 'drizzle-cube://schema',
name: 'Cube Schema',
description: 'Current cube metadata as JSON',
mimeType: 'application/json',
text: JSON.stringify(semanticLayer.getMetadata(), null, 2)
}
const mcpResources = [...getDefaultResources(), schemaResource]
const mcpPrompts = getDefaultPrompts()
const mcpBasePath = mcp.basePath ?? '/mcp'
/**
* MCP Streamable HTTP endpoint (JSON-RPC 2.0 + optional SSE)
* Implements MCP 2025-11-25 spec
*/
app.post(`${mcpBasePath}`, async (c) => {
// Validate Origin header (MCP 2025-11-25: MUST validate, return 403 if invalid)
const originValidation = validateOriginHeader(
c.req.header('origin'),
mcp.allowedOrigins ? { allowedOrigins: mcp.allowedOrigins } : {}
)
if (!originValidation.valid) {
return c.json(buildJsonRpcError(null, -32600, originValidation.reason), 403)
}
// Validate Accept header (MCP 2025-11-25: MUST include both application/json and text/event-stream)
const acceptHeader = c.req.header('accept')
if (!validateAcceptHeader(acceptHeader)) {
return c.json(buildJsonRpcError(null, -32600, 'Accept header must include both application/json and text/event-stream'), 400)
}
const protocol = negotiateProtocol(c.req.header() as Record<string, string>)
if (!protocol.ok) {
return c.json({
error: 'Unsupported MCP protocol version',
supported: protocol.supported
}, 426)
}
const body = await c.req.json().catch(() => null)
const rpcRequest = parseJsonRpc(body)
if (!rpcRequest) {
return c.json(buildJsonRpcError(null, -32600, 'Invalid JSON-RPC 2.0 request'), 400)
}
const wantsStream = wantsEventStream(acceptHeader)
const isInitialize = rpcRequest.method === 'initialize'
try {
const result = await dispatchMcpMethod(
rpcRequest.method,
rpcRequest.params,
{
semanticLayer,
extractSecurityContext,
rawRequest: c,
rawResponse: null,
negotiatedProtocol: protocol.negotiated,
resources: mcpResources,
prompts: mcpPrompts
}
)
if (isNotification(rpcRequest)) {
return c.body(null, 202)
}
const response = buildJsonRpcResult(rpcRequest.id ?? null, result)
// Extract session ID for header (MCP 2025-11-25: return in MCP-Session-Id header)
const sessionId = isInitialize && result && typeof result === 'object' && 'sessionId' in result
? (result as { sessionId?: string }).sessionId
: undefined
const responseHeaders: Record<string, string> = {}
if (sessionId) {
responseHeaders[MCP_SESSION_ID_HEADER] = sessionId
}
if (wantsStream) {
const encoder = new TextEncoder()
const eventId = primeEventId()
const stream = new ReadableStream({
start(controller) {
controller.enqueue(encoder.encode(`id: ${eventId}\n\n`))
controller.enqueue(encoder.encode(serializeSseEvent(response, eventId)))
controller.close()
}
})
return new Response(stream, {
status: 200,
headers: {
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache',
Connection: 'keep-alive',
...responseHeaders
}
})
}
return c.json(response, 200, responseHeaders)
} catch (error) {
// Log notification errors before returning 202 (P3 fix)
if (isNotification(rpcRequest)) {
console.error('MCP notification processing error:', error)
return c.body(null, 202)
}
console.error('MCP RPC error:', error)
const code = (error as any)?.code ?? -32603
const data = (error as any)?.data
const message = (error as Error).message || 'MCP request failed'
const rpcError = buildJsonRpcError(rpcRequest.id ?? null, code, message, data)
if (wantsStream) {
const encoder = new TextEncoder()
const eventId = primeEventId()
const stream = new ReadableStream({
start(controller) {
controller.enqueue(encoder.encode(`id: ${eventId}\n\n`))
controller.enqueue(encoder.encode(serializeSseEvent(rpcError, eventId)))
controller.close()
}
})
return new Response(stream, {
status: 200,
headers: {
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache',
Connection: 'keep-alive'
}
})
}
return c.json(rpcError, 200)
}
})
/**
* DELETE handler for session termination (MCP 2025-11-25)
* Clients SHOULD send DELETE to terminate sessions
*/
app.delete(`${mcpBasePath}`, (c) => {
// For now, return 405 Method Not Allowed as we don't track sessions server-side
// A full implementation would track sessions and clean up resources here
return c.json({ error: 'Session termination not supported' }, 405)
})
app.get(`${mcpBasePath}`, (_c) => {
const encoder = new TextEncoder()
const eventId = primeEventId()
let keepAlive: ReturnType<typeof setInterval>
const stream = new ReadableStream({
start(controller) {
controller.enqueue(encoder.encode(serializeSseEvent({
jsonrpc: '2.0',
method: 'mcp/ready',
params: { protocol: 'streamable-http' }
}, eventId, 15000)))
keepAlive = setInterval(() => {
controller.enqueue(encoder.encode(': keep-alive\n\n'))
}, 15000)
},
cancel() {
clearInterval(keepAlive)
}
})
return new Response(stream, {
status: 200,
headers: {
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache',
Connection: 'keep-alive'
}
})
})
}
return app
}
/**
* Convenience function to create routes and mount them on an existing Hono app
*/
export function mountCubeRoutes(
app: Hono,
options: HonoAdapterOptions
) {
const cubeRoutes = createCubeRoutes(options)
app.route('/', cubeRoutes)
return app
}
/**
* Create a complete Hono app with Cube.js routes
*
* @example
* const app = createCubeApp({
* cubes: [salesCube, employeesCube],
* drizzle: db,
* schema,
* extractSecurityContext: async (c) => {
* const token = c.req.header('Authorization')
* const decoded = await verifyJWT(token)
* return { organisationId: decoded.orgId, userId: decoded.userId }
* }
* })
*/
export function createCubeApp(
options: HonoAdapterOptions
) {
const app = new Hono()
return mountCubeRoutes(app, options)
}
// Re-export types for convenience
export type { SecurityContext, DatabaseExecutor, SemanticQuery, DrizzleDatabase }
|