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* @onlineapps/connector-core
*
* Core integration library that bundles all essential connectors
* for OA Drive microservices. Provides a unified interface for:
* - Message Queue operations
* - Service Registry registration and discovery
* - Workflow cookbook processing
* - Storage operations with MinIO
* - Centralized logging
*/
require('dotenv').config();
// Re-export all connectors
module.exports = {
// MQ Client for RabbitMQ communication
MQClient: require('@onlineapps/connector-mq-client'),
// Service Registry client for registration and event consumption
...require('@onlineapps/connector-registry-client'),
// Cookbook validation and processing
...require('@onlineapps/connector-cookbook'),
// Storage connector for MinIO with fingerprinting
StorageConnector: require('@onlineapps/connector-storage'),
// Logger (if available)
createLogger: (() => {
try {
return require('@onlineapps/connector-logger');
} catch (e) {
// Logger not available, return console as fallback
return function(config) {
return {
info: console.log,
error: console.error,
warn: console.warn,
debug: console.debug,
api: { info: console.log, error: console.error },
mq: { info: console.log, error: console.error },
workflow: { info: console.log, error: console.error },
registry: { info: console.log, error: console.error },
close: async () => {}
};
};
}
})(),
// Convenience factory for creating a fully configured microservice
createMicroservice: function(config) {
const { ServiceRegistryClient, MQClient, StorageConnector, createLogger } = module.exports;
// Create logger instance
const logger = createLogger({
serviceName: config.serviceName,
version: config.version,
...config.logger
});
return {
logger,
// Initialize Registry Client
registry: config.registry ? new ServiceRegistryClient({
amqpUrl: config.amqpUrl || process.env.RABBITMQ_URL,
serviceName: config.serviceName,
version: config.version || '1.0.0',
...config.registry
}) : null,
// Initialize MQ Client
mq: config.mq ? new MQClient({
type: 'rabbitmq',
host: config.amqpUrl || process.env.RABBITMQ_URL,
queue: `${config.serviceName}_queue`,
...config.mq
}) : null,
// Initialize Storage
storage: config.storage ? new StorageConnector({
endPoint: process.env.MINIO_ENDPOINT || 'localhost',
port: parseInt(process.env.MINIO_PORT || 9000),
accessKey: process.env.MINIO_ACCESS_KEY || 'minioadmin',
secretKey: process.env.MINIO_SECRET_KEY || 'minioadmin',
...config.storage
}) : null,
// Initialize all components
async init() {
const results = {};
// Initialize Registry
Eif (this.registry) {
await this.registry.initialize();
// Optionally subscribe to changes
Iif (config.subscribeToRegistry) {
await this.registry.subscribeToChanges();
}
// Start heartbeat
this.registry.startHeartbeat();
results.registry = true;
}
// Initialize MQ
Eif (this.mq) {
await this.mq.connect();
results.mq = true;
}
// Initialize Storage
Eif (this.storage) {
await this.storage.initialize();
results.storage = true;
}
return results;
},
// Graceful shutdown
async shutdown() {
const promises = [];
Eif (this.registry) {
promises.push(this.registry.dispose());
}
Eif (this.mq) {
promises.push(this.mq.disconnect());
}
Eif (this.logger && this.logger.close) {
promises.push(this.logger.close());
}
await Promise.all(promises);
}
};
},
// Helper for workflow processing
WorkflowHelper: {
/**
* Create a workflow message
*/
createMessage(opts) {
return {
workflow_id: opts.workflowId,
cookbook_name: opts.cookbookName,
step_index: opts.step || 0,
data: opts.data || {},
results: [],
timestamp: new Date().toISOString()
};
},
/**
* Parse a workflow message
*/
parseMessage(message) {
return {
workflowId: message.workflow_id,
cookbookName: message.cookbook_name,
step: message.step_index,
data: message.data,
results: message.results
};
},
/**
* Get next queue from cookbook step
*/
getNextQueue(step) {
if (step.queue) {
return step.queue;
}
return `${step.service}.queue`;
},
/**
* Validate workflow message
*/
isValidMessage(message) {
return !!(message.workflow_id && message.cookbook_name &&
typeof message.step_index === 'number' && message.data);
},
/**
* Add result to workflow message
*/
addResult(message, result) {
return {
...message,
results: [...(message.results || []), result],
last_result: result
};
},
/**
* Create error message
*/
createErrorMessage(message, error, serviceName) {
return {
...message,
status: 'error',
error: {
message: error.message,
stack: error.stack,
service: serviceName,
step: message.step_index
}
};
},
/**
* Process a workflow step
* @param {Object} message - Workflow message
* @param {Function} handler - Step handler function
* @returns {Object} - Updated workflow message
*/
async processStep(message, handler) {
const { workflow_id, current_step, cookbook, context = {} } = message;
// Get current step from cookbook
const step = cookbook?.steps?.[current_step];
if (!step) {
throw new Error(`Step ${current_step} not found in cookbook`);
}
// Execute handler
const result = await handler(step, context);
// Build response message
return {
...message,
current_step: current_step + 1,
context: {
...context,
[`step_${current_step}_result`]: result
},
trace: [
...(message.trace || []),
{
step: current_step,
service: step.service,
timestamp: new Date().toISOString(),
result: result
}
]
};
},
/**
* Determine next queue based on workflow state
* @param {Object} message - Workflow message
* @returns {string} - Next queue name
*/
getNextQueueFromMessage(message) {
const { current_step, cookbook } = message;
if (cookbook && current_step < cookbook.steps.length) {
const nextStep = cookbook.steps[current_step];
return `${nextStep.service}.queue`;
}
return 'workflow.completed';
}
}
};
// For backward compatibility
module.exports.ConnectorCore = module.exports; |