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| 1 | +import { Hono } from 'hono'; |
| 2 | +import { cors } from 'hono/cors'; |
| 3 | +import { stream } from 'hono/streaming'; |
| 4 | +import { serve } from '@hono/node-server'; |
| 5 | +import { formatDataStreamPart } from '@ai-sdk/ui-utils'; |
| 6 | +import { logger } from '@browseros/common'; |
| 7 | +import type { Context, Next } from 'hono'; |
| 8 | +import type { ContentfulStatusCode } from 'hono/utils/http-status'; |
| 9 | +import type { z } from 'zod'; |
| 10 | + |
| 11 | +import { SessionManager } from '../session/SessionManager.js'; |
| 12 | +import { HttpAgentError, ValidationError, AgentExecutionError } from '../errors.js'; |
| 13 | +import { ChatRequestSchema, HttpServerConfigSchema } from './types.js'; |
| 14 | +import type { HttpServerConfig, ValidatedHttpServerConfig, ChatRequest } from './types.js'; |
| 15 | + |
| 16 | +type AppVariables = { |
| 17 | + validatedBody: unknown; |
| 18 | +}; |
| 19 | + |
| 20 | +const DEFAULT_MCP_SERVER_URL = 'http://127.0.0.1:9150/mcp'; |
| 21 | +const DEFAULT_TEMP_DIR = '/tmp'; |
| 22 | + |
| 23 | +function validateRequest<T>(schema: z.ZodType<T>) { |
| 24 | + return async (c: Context<{ Variables: AppVariables }>, next: Next) => { |
| 25 | + try { |
| 26 | + const body = await c.req.json(); |
| 27 | + const validated = schema.parse(body); |
| 28 | + c.set('validatedBody', validated); |
| 29 | + await next(); |
| 30 | + } catch (err) { |
| 31 | + if (err && typeof err === 'object' && 'issues' in err) { |
| 32 | + const zodError = err as { issues: unknown }; |
| 33 | + logger.warn('Request validation failed', { issues: zodError.issues }); |
| 34 | + throw new ValidationError('Request validation failed', zodError.issues); |
| 35 | + } |
| 36 | + throw err; |
| 37 | + } |
| 38 | + }; |
| 39 | +} |
| 40 | + |
| 41 | +export function createHttpServer(config: HttpServerConfig) { |
| 42 | + const validatedConfig: ValidatedHttpServerConfig = HttpServerConfigSchema.parse(config); |
| 43 | + const mcpServerUrl = validatedConfig.mcpServerUrl || process.env.MCP_SERVER_URL || DEFAULT_MCP_SERVER_URL; |
| 44 | + |
| 45 | + const app = new Hono<{ Variables: AppVariables }>(); |
| 46 | + const sessionManager = new SessionManager(); |
| 47 | + |
| 48 | + app.use( |
| 49 | + '/*', |
| 50 | + cors({ |
| 51 | + origin: validatedConfig.corsOrigins, |
| 52 | + allowMethods: ['GET', 'POST', 'DELETE', 'OPTIONS'], |
| 53 | + allowHeaders: ['Content-Type', 'Authorization'], |
| 54 | + }), |
| 55 | + ); |
| 56 | + |
| 57 | + app.onError((err, c) => { |
| 58 | + const error = err as Error; |
| 59 | + |
| 60 | + if (error instanceof HttpAgentError) { |
| 61 | + logger.warn('HTTP Agent Error', { |
| 62 | + name: error.name, |
| 63 | + message: error.message, |
| 64 | + code: error.code, |
| 65 | + statusCode: error.statusCode, |
| 66 | + }); |
| 67 | + return c.json(error.toJSON(), error.statusCode as ContentfulStatusCode); |
| 68 | + } |
| 69 | + |
| 70 | + logger.error('Unhandled Error', { |
| 71 | + message: error.message, |
| 72 | + stack: error.stack, |
| 73 | + }); |
| 74 | + |
| 75 | + return c.json( |
| 76 | + { |
| 77 | + error: { |
| 78 | + name: 'InternalServerError', |
| 79 | + message: error.message || 'An unexpected error occurred', |
| 80 | + code: 'INTERNAL_SERVER_ERROR', |
| 81 | + statusCode: 500, |
| 82 | + }, |
| 83 | + }, |
| 84 | + 500, |
| 85 | + ); |
| 86 | + }); |
| 87 | + |
| 88 | + app.get('/health', (c) => c.json({ status: 'ok' })); |
| 89 | + |
| 90 | + app.post('/chat', validateRequest(ChatRequestSchema), async (c) => { |
| 91 | + const request = c.get('validatedBody') as ChatRequest; |
| 92 | + |
| 93 | + logger.info('Chat request received', { |
| 94 | + conversationId: request.conversationId, |
| 95 | + provider: request.provider, |
| 96 | + model: request.model, |
| 97 | + }); |
| 98 | + |
| 99 | + c.header('Content-Type', 'text/plain; charset=utf-8'); |
| 100 | + c.header('X-Vercel-AI-Data-Stream', 'v1'); |
| 101 | + c.header('Cache-Control', 'no-cache'); |
| 102 | + c.header('Connection', 'keep-alive'); |
| 103 | + |
| 104 | + return stream(c, async (honoStream) => { |
| 105 | + try { |
| 106 | + const agent = await sessionManager.getOrCreate({ |
| 107 | + conversationId: request.conversationId, |
| 108 | + provider: request.provider, |
| 109 | + model: request.model, |
| 110 | + apiKey: request.apiKey, |
| 111 | + baseUrl: request.baseUrl, |
| 112 | + // Azure-specific |
| 113 | + resourceName: request.resourceName, |
| 114 | + // AWS Bedrock-specific |
| 115 | + region: request.region, |
| 116 | + accessKeyId: request.accessKeyId, |
| 117 | + secretAccessKey: request.secretAccessKey, |
| 118 | + sessionToken: request.sessionToken, |
| 119 | + // Agent-specific |
| 120 | + tempDir: validatedConfig.tempDir || DEFAULT_TEMP_DIR, |
| 121 | + mcpServerUrl, |
| 122 | + }); |
| 123 | + |
| 124 | + await agent.execute(request.message, honoStream); |
| 125 | + } catch (error) { |
| 126 | + const errorMessage = error instanceof Error ? error.message : 'Agent execution failed'; |
| 127 | + logger.error('Agent execution error', { |
| 128 | + conversationId: request.conversationId, |
| 129 | + error: errorMessage, |
| 130 | + }); |
| 131 | + await honoStream.write(formatDataStreamPart('error', errorMessage)); |
| 132 | + throw new AgentExecutionError('Agent execution failed', error instanceof Error ? error : undefined); |
| 133 | + } |
| 134 | + }); |
| 135 | + }); |
| 136 | + |
| 137 | + app.delete('/chat/:conversationId', (c) => { |
| 138 | + const conversationId = c.req.param('conversationId'); |
| 139 | + const deleted = sessionManager.delete(conversationId); |
| 140 | + |
| 141 | + if (deleted) { |
| 142 | + return c.json({ |
| 143 | + success: true, |
| 144 | + message: `Session ${conversationId} deleted`, |
| 145 | + sessionCount: sessionManager.count(), |
| 146 | + }); |
| 147 | + } |
| 148 | + |
| 149 | + return c.json({ |
| 150 | + success: false, |
| 151 | + message: `Session ${conversationId} not found`, |
| 152 | + }, 404); |
| 153 | + }); |
| 154 | + |
| 155 | + const server = serve({ |
| 156 | + fetch: app.fetch, |
| 157 | + port: validatedConfig.port, |
| 158 | + hostname: validatedConfig.host, |
| 159 | + }); |
| 160 | + |
| 161 | + logger.info('HTTP Agent Server started', { |
| 162 | + port: validatedConfig.port, |
| 163 | + host: validatedConfig.host, |
| 164 | + }); |
| 165 | + |
| 166 | + return { |
| 167 | + app, |
| 168 | + server, |
| 169 | + config: validatedConfig, |
| 170 | + }; |
| 171 | +} |
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