iopa-common-middleware

const iopa = require('iopa'); const BackForth = require('iopa-common-middleware').BackForth; const Cache = require('iopa-common-middleware').Cache; const ClientSend = require('iopa-common-middleware').ClientSend; async function runIOPAExample() { const app = new iopa.App(); // Apply the common middleware components in order app.use(BackForth); app.use(Cache); app.use(ClientSend); // Define a simple IOPA handler function to process requests app.use(async (context, next) => { console.log(`[App Handler] Request received: ${context.method} ${context.url}`); if (context.method === 'GET' && context.url === '/') { context.response['iopa.Body'] = 'Hello from IOPA common middleware!'; context.response['iopa.StatusCode'] = 200; } else { context.response['iopa.Body'] = 'Resource Not Found'; context.response['iopa.StatusCode'] = 404; } await next(); // Pass control to the next middleware/handler }); console.log('IOPA Application configured with common middleware.'); // Simulate an incoming IOPA request context const mockContext = { method: 'GET', url: '/', request: {}, response: {}, 'iopa.App': app // Essential for middleware to interact with the app instance }; // Invoke the middleware chain with the mock context console.log('\nSimulating IOPA request...'); await app.invoke(mockContext); // Log the simulated response details console.log(`[Simulated Response] Status: ${mockContext.response['iopa.StatusCode']}`); console.log(`[Simulated Response] Body: ${mockContext.response['iopa.Body']}`); // ClientSend middleware adds .send() and .observe() to the context, // which would typically be used for outbound requests from the server. // This example focuses on inbound processing, so a direct demonstration // of .send() requires a more complex setup with a real transport. console.log('\nMiddleware successfully processed the request.'); } runIOPAExample().catch(console.error);