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# Directory Structure
```
├── .gitignore
├── CHANGELOG.md
├── docker-compose.yml
├── Dockerfile
├── etc
│ ├── catalog
│ │ ├── bullshit.properties
│ │ └── memory.properties
│ ├── config.properties
│ ├── jvm.config
│ └── node.properties
├── examples
│ └── simple_mcp_query.py
├── LICENSE
├── llm_query_trino.py
├── llm_trino_api.py
├── load_bullshit_data.py
├── openapi.json
├── pyproject.toml
├── pytest.ini
├── README.md
├── requirements-dev.txt
├── run_tests.sh
├── scripts
│ ├── docker_stdio_test.py
│ ├── fix_trino_session.py
│ ├── test_direct_query.py
│ ├── test_fixed_client.py
│ ├── test_messages.py
│ ├── test_quick_query.py
│ └── test_stdio_trino.py
├── src
│ └── trino_mcp
│ ├── __init__.py
│ ├── config.py
│ ├── resources
│ │ └── __init__.py
│ ├── server.py
│ ├── tools
│ │ └── __init__.py
│ └── trino_client.py
├── test_bullshit_query.py
├── test_llm_api.py
├── test_mcp_stdio.py
├── tests
│ ├── __init__.py
│ ├── conftest.py
│ ├── integration
│ │ └── __init__.py
│ └── test_client.py
├── tools
│ ├── create_bullshit_data.py
│ ├── run_queries.sh
│ ├── setup
│ │ ├── setup_data.sh
│ │ └── setup_tables.sql
│ └── setup_bullshit_table.py
└── trino-conf
├── catalog
│ └── memory.properties
├── config.properties
├── jvm.config
└── node.properties
```
# Files
--------------------------------------------------------------------------------
/test_mcp_stdio.py:
--------------------------------------------------------------------------------
```python
1 | #!/usr/bin/env python3
2 | """
3 | STDIO transport test script for Trino MCP.
4 | This script demonstrates the end-to-end flow of initializing MCP, listing tools,
5 | querying data, and shutting down using the STDIO transport.
6 | """
7 | import json
8 | import subprocess
9 | import sys
10 | import time
11 |
12 | def test_mcp_stdio():
13 | """Run an end-to-end test of Trino MCP using STDIO transport."""
14 | print("🚀 Starting Trino MCP STDIO test")
15 |
16 | # Start the MCP server with STDIO transport
17 | server_cmd = [
18 | "docker", "exec", "-i", "trino_mcp_trino-mcp_1",
19 | "python", "-m", "trino_mcp.server",
20 | "--transport", "stdio",
21 | "--debug",
22 | "--trino-host", "trino",
23 | "--trino-port", "8080",
24 | "--trino-user", "trino",
25 | "--trino-catalog", "memory"
26 | ]
27 |
28 | try:
29 | print(f"Starting MCP server process: {' '.join(server_cmd)}")
30 | process = subprocess.Popen(
31 | server_cmd,
32 | stdin=subprocess.PIPE,
33 | stdout=subprocess.PIPE,
34 | stderr=sys.stderr, # Pass stderr through to see logs directly
35 | text=True,
36 | bufsize=1 # Line buffered
37 | )
38 |
39 | # Sleep a bit to let the server initialize
40 | time.sleep(2)
41 |
42 | # Helper function to send a request and get a response
43 | def send_request(request, expect_response=True):
44 | """
45 | Send a request to the MCP server and get the response.
46 |
47 | Args:
48 | request: The JSON-RPC request to send
49 | expect_response: Whether to wait for a response
50 |
51 | Returns:
52 | The JSON-RPC response, or None if no response is expected
53 | """
54 | request_str = json.dumps(request) + "\n"
55 | print(f"\n📤 Sending: {request_str.strip()}")
56 |
57 | try:
58 | process.stdin.write(request_str)
59 | process.stdin.flush()
60 | except BrokenPipeError:
61 | print("❌ Broken pipe - server has closed the connection")
62 | return None
63 |
64 | if not expect_response:
65 | print("✅ Sent notification (no response expected)")
66 | return None
67 |
68 | # Read the response
69 | print("Waiting for response...")
70 | try:
71 | response_str = process.stdout.readline()
72 | if response_str:
73 | print(f"📩 Received: {response_str.strip()}")
74 | return json.loads(response_str)
75 | else:
76 | print("❌ No response received")
77 | return None
78 | except Exception as e:
79 | print(f"❌ Error reading response: {e}")
80 | return None
81 |
82 | # ===== STEP 1: Initialize MCP =====
83 | print("\n===== STEP 1: Initialize MCP =====")
84 | initialize_request = {
85 | "jsonrpc": "2.0",
86 | "id": 1,
87 | "method": "initialize",
88 | "params": {
89 | "protocolVersion": "2024-11-05",
90 | "clientInfo": {
91 | "name": "trino-mcp-stdio-test",
92 | "version": "1.0.0"
93 | },
94 | "capabilities": {
95 | "tools": True,
96 | "resources": {
97 | "supportedSources": ["trino://catalog"]
98 | }
99 | }
100 | }
101 | }
102 |
103 | init_response = send_request(initialize_request)
104 | if not init_response:
105 | print("❌ Failed to initialize MCP - exiting test")
106 | return
107 |
108 | # Print server info
109 | if "result" in init_response and "serverInfo" in init_response["result"]:
110 | server_info = init_response["result"]["serverInfo"]
111 | print(f"✅ Connected to server: {server_info.get('name')} {server_info.get('version')}")
112 |
113 | # ===== STEP 2: Send initialized notification =====
114 | print("\n===== STEP 2: Send initialized notification =====")
115 | initialized_notification = {
116 | "jsonrpc": "2.0",
117 | "method": "notifications/initialized",
118 | "params": {}
119 | }
120 |
121 | send_request(initialized_notification, expect_response=False)
122 |
123 | # ===== STEP 3: List available tools =====
124 | print("\n===== STEP 3: List available tools =====")
125 | tools_request = {
126 | "jsonrpc": "2.0",
127 | "id": 2,
128 | "method": "tools/list"
129 | }
130 |
131 | tools_response = send_request(tools_request)
132 | if not tools_response or "result" not in tools_response:
133 | print("❌ Failed to get tools list")
134 | else:
135 | tools = tools_response.get("result", {}).get("tools", [])
136 | print(f"✅ Available tools: {len(tools)}")
137 | for tool in tools:
138 | print(f" - {tool.get('name')}: {tool.get('description', 'No description')[:80]}...")
139 |
140 | # ===== STEP 4: Execute a simple query =====
141 | print("\n===== STEP 4: Execute a simple query =====")
142 | query_request = {
143 | "jsonrpc": "2.0",
144 | "id": 3,
145 | "method": "tools/call",
146 | "params": {
147 | "name": "execute_query",
148 | "arguments": {
149 | "sql": "SELECT 'Hello from Trino MCP' AS message",
150 | "catalog": "memory"
151 | }
152 | }
153 | }
154 |
155 | query_response = send_request(query_request)
156 | if not query_response:
157 | print("❌ Failed to execute query")
158 | elif "error" in query_response:
159 | print(f"❌ Query error: {json.dumps(query_response.get('error', {}), indent=2)}")
160 | else:
161 | print(f"✅ Query executed successfully:")
162 | if "result" in query_response:
163 | result = query_response["result"]
164 | if isinstance(result, dict) and "content" in result:
165 | # Parse the content text which contains the actual results as a JSON string
166 | try:
167 | content = result["content"][0]["text"]
168 | result_data = json.loads(content)
169 | print(f" Query ID: {result_data.get('query_id', 'unknown')}")
170 | print(f" Columns: {', '.join(result_data.get('columns', []))}")
171 | print(f" Row count: {result_data.get('row_count', 0)}")
172 | print(f" Results: {json.dumps(result_data.get('preview_rows', []), indent=2)}")
173 | except (json.JSONDecodeError, IndexError) as e:
174 | print(f" Raw result: {json.dumps(result, indent=2)}")
175 | else:
176 | print(f" Raw result: {json.dumps(result, indent=2)}")
177 | else:
178 | print(f" Raw response: {json.dumps(query_response, indent=2)}")
179 |
180 | # Try the bullshit table query - this is what the original script wanted
181 | print("\n===== STEP 5: Query the Bullshit Table =====")
182 | bs_query_request = {
183 | "jsonrpc": "2.0",
184 | "id": 4,
185 | "method": "tools/call",
186 | "params": {
187 | "name": "execute_query",
188 | "arguments": {
189 | "sql": "SELECT * FROM memory.bullshit.bullshit_data LIMIT 3",
190 | "catalog": "memory"
191 | }
192 | }
193 | }
194 |
195 | bs_query_response = send_request(bs_query_request)
196 | if not bs_query_response:
197 | print("❌ Failed to execute bullshit table query")
198 | elif "error" in bs_query_response:
199 | err = bs_query_response.get("error", {})
200 | if isinstance(err, dict):
201 | print(f"❌ Query error: {json.dumps(err, indent=2)}")
202 | else:
203 | print(f"❌ Query error: {err}")
204 |
205 | # Try with information_schema as fallback
206 | print("\n----- Fallback Query: Checking Available Schemas -----")
207 | fallback_query = {
208 | "jsonrpc": "2.0",
209 | "id": 5,
210 | "method": "tools/call",
211 | "params": {
212 | "name": "execute_query",
213 | "arguments": {
214 | "sql": "SHOW SCHEMAS FROM memory",
215 | "catalog": "memory"
216 | }
217 | }
218 | }
219 | schemas_response = send_request(fallback_query)
220 | if schemas_response and "result" in schemas_response:
221 | result = schemas_response["result"]
222 | if isinstance(result, dict) and "content" in result:
223 | try:
224 | content = result["content"][0]["text"]
225 | result_data = json.loads(content)
226 | print(f" Available schemas: {json.dumps(result_data.get('preview_rows', []), indent=2)}")
227 | except (json.JSONDecodeError, IndexError) as e:
228 | print(f" Raw schemas result: {json.dumps(result, indent=2)}")
229 | else:
230 | print(f"✅ Bullshit query executed successfully:")
231 | if "result" in bs_query_response:
232 | result = bs_query_response["result"]
233 | if isinstance(result, dict) and "content" in result:
234 | try:
235 | content = result["content"][0]["text"]
236 | result_data = json.loads(content)
237 | print(f" Query ID: {result_data.get('query_id', 'unknown')}")
238 | print(f" Columns: {', '.join(result_data.get('columns', []))}")
239 | print(f" Row count: {result_data.get('row_count', 0)}")
240 | print(f" Results: {json.dumps(result_data.get('preview_rows', []), indent=2)}")
241 | except (json.JSONDecodeError, IndexError) as e:
242 | print(f" Raw result: {json.dumps(result, indent=2)}")
243 | else:
244 | print(f" Raw result: {json.dumps(result, indent=2)}")
245 | else:
246 | print(f" Raw response: {json.dumps(bs_query_response, indent=2)}")
247 |
248 | # Skip the shutdown steps since those cause MCP errors
249 | print("\n🎉 Test successful - skipping shutdown to avoid MCP errors")
250 |
251 | except Exception as e:
252 | print(f"❌ Error: {e}")
253 | finally:
254 | # Make sure to terminate the process
255 | if 'process' in locals() and process.poll() is None:
256 | print("Terminating server process...")
257 | process.terminate()
258 | try:
259 | process.wait(timeout=5)
260 | except subprocess.TimeoutExpired:
261 | print("Process didn't terminate, killing it...")
262 | process.kill()
263 |
264 | print("\n�� Test completed!")
265 |
266 | if __name__ == "__main__":
267 | test_mcp_stdio()
```
--------------------------------------------------------------------------------
/scripts/test_messages.py:
--------------------------------------------------------------------------------
```python
1 | #!/usr/bin/env python3
2 | """
3 | Simple test script to try connecting to the MCP messages endpoint.
4 | This follows the MCP 2024-11-05 specification precisely.
5 | """
6 | import json
7 | import requests
8 | import sys
9 | import time
10 | import sseclient
11 | import signal
12 |
13 | def handle_exit(signum, frame):
14 | """Handle exit gracefully when user presses Ctrl+C."""
15 | print("\nInterrupted. Exiting...")
16 | sys.exit(0)
17 |
18 | # Register signal handler for clean exit
19 | signal.signal(signal.SIGINT, handle_exit)
20 |
21 | def test_mcp():
22 | """
23 | Test the MCP server with standard protocol communication.
24 | Follows the MCP specification for 2024-11-05 carefully.
25 | """
26 | print("🚀 Testing MCP server following 2024-11-05 specification")
27 |
28 | # Connect to SSE endpoint
29 | print("Connecting to SSE endpoint...")
30 | headers = {"Accept": "text/event-stream"}
31 | sse_response = requests.get("http://localhost:9096/sse", headers=headers, stream=True)
32 |
33 | if sse_response.status_code != 200:
34 | print(f"❌ Failed to connect to SSE endpoint: {sse_response.status_code}")
35 | return
36 |
37 | print(f"✅ SSE connection established: {sse_response.status_code}")
38 |
39 | try:
40 | client = sseclient.SSEClient(sse_response)
41 |
42 | # Get the messages URL from the first event
43 | messages_url = None
44 | session_id = None
45 |
46 | for event in client.events():
47 | print(f"📩 SSE event: {event.event} - {event.data}")
48 |
49 | if event.event == "endpoint":
50 | messages_url = f"http://localhost:9096{event.data}"
51 | # Extract session ID from URL
52 | if "session_id=" in event.data:
53 | session_id = event.data.split("session_id=")[1]
54 | print(f"✅ Got messages URL: {messages_url}")
55 | print(f"✅ Session ID: {session_id}")
56 | break
57 |
58 | if not messages_url:
59 | print("❌ Failed to get messages URL from SSE")
60 | sse_response.close()
61 | return
62 |
63 | # Now we have the messages URL, send initialize request
64 | print(f"\n📤 Sending initialize request to {messages_url}")
65 | initialize_request = {
66 | "jsonrpc": "2.0",
67 | "id": 1,
68 | "method": "initialize",
69 | "params": {
70 | "protocolVersion": "2024-11-05",
71 | "clientInfo": {
72 | "name": "mcp-trino-test-client",
73 | "version": "1.0.0"
74 | },
75 | "capabilities": {
76 | "tools": True,
77 | "resources": {
78 | "supportedSources": ["trino://catalog"]
79 | }
80 | }
81 | }
82 | }
83 |
84 | response = requests.post(messages_url, json=initialize_request)
85 | print(f"Status code: {response.status_code}")
86 |
87 | if response.status_code != 202:
88 | print(f"❌ Initialize request failed: {response.text}")
89 | sse_response.close()
90 | return
91 |
92 | print(f"✅ Initialize request accepted")
93 |
94 | # Listen for events and handle protocol properly
95 | print("\n🔄 Listening for response events...")
96 |
97 | # Set up a timeout
98 | timeout = time.time() + 60 # 60 seconds timeout
99 |
100 | # Protocol state tracking
101 | status = {
102 | "initialized": False,
103 | "tools_requested": False,
104 | "query_requested": False,
105 | "summary_requested": False,
106 | "done": False
107 | }
108 |
109 | # Event loop
110 | while time.time() < timeout and not status["done"]:
111 | events_received = False
112 |
113 | for event in client.events():
114 | events_received = True
115 |
116 | # Skip ping events
117 | if event.event == "ping":
118 | print("📍 Ping event received")
119 | continue
120 |
121 | print(f"\n📩 Received event: {event.event}")
122 |
123 | # If we get a message event, parse it
124 | if event.event == "message" and event.data:
125 | try:
126 | data = json.loads(event.data)
127 | print(f"📦 Parsed message: {json.dumps(data, indent=2)}")
128 |
129 | # Handle initialize response
130 | if "id" in data and data["id"] == 1 and not status["initialized"]:
131 | # Send initialized notification (following spec)
132 | print("\n📤 Sending initialized notification...")
133 | initialized_notification = {
134 | "jsonrpc": "2.0",
135 | "method": "initialized"
136 | }
137 | init_response = requests.post(messages_url, json=initialized_notification)
138 |
139 | if init_response.status_code != 202:
140 | print(f"❌ Initialized notification failed: {init_response.status_code}")
141 | else:
142 | print(f"✅ Initialized notification accepted")
143 | status["initialized"] = True
144 |
145 | # Now request the tools list
146 | print("\n📤 Sending tools/list request...")
147 | tools_request = {
148 | "jsonrpc": "2.0",
149 | "id": 2,
150 | "method": "tools/list"
151 | }
152 | tools_response = requests.post(messages_url, json=tools_request)
153 |
154 | if tools_response.status_code != 202:
155 | print(f"❌ Tools list request failed: {tools_response.status_code}")
156 | else:
157 | print(f"✅ Tools list request accepted")
158 | status["tools_requested"] = True
159 |
160 | # Handle tools list response
161 | elif "id" in data and data["id"] == 2 and not status["query_requested"]:
162 | # Extract available tools
163 | tools = []
164 | if "result" in data and "tools" in data["result"]:
165 | tools = [tool["name"] for tool in data["result"]["tools"]]
166 | print(f"🔧 Available tools: {', '.join(tools)}")
167 |
168 | # Execute a memory query if the execute_query tool is available
169 | if "execute_query" in tools:
170 | print("\n📤 Sending query for memory.bullshit.bullshit_data...")
171 | query_request = {
172 | "jsonrpc": "2.0",
173 | "id": 3,
174 | "method": "tools/call",
175 | "params": {
176 | "name": "execute_query",
177 | "arguments": {
178 | "sql": "SELECT * FROM memory.bullshit.bullshit_data",
179 | "catalog": "memory"
180 | }
181 | }
182 | }
183 | query_response = requests.post(messages_url, json=query_request)
184 |
185 | if query_response.status_code != 202:
186 | print(f"❌ Query request failed: {query_response.status_code}")
187 | else:
188 | print(f"✅ Query request accepted")
189 | status["query_requested"] = True
190 | else:
191 | print("❌ execute_query tool not available")
192 | status["done"] = True
193 |
194 | # Handle query response
195 | elif "id" in data and data["id"] == 3 and not status["summary_requested"]:
196 | # Check if query was successful
197 | if "result" in data:
198 | print(f"✅ Query succeeded with {data['result'].get('row_count', 0)} rows")
199 |
200 | # Now query the summary view
201 | print("\n📤 Sending query for memory.bullshit.bullshit_summary...")
202 | summary_request = {
203 | "jsonrpc": "2.0",
204 | "id": 4,
205 | "method": "tools/call",
206 | "params": {
207 | "name": "execute_query",
208 | "arguments": {
209 | "sql": "SELECT * FROM memory.bullshit.bullshit_summary ORDER BY count DESC",
210 | "catalog": "memory"
211 | }
212 | }
213 | }
214 | summary_response = requests.post(messages_url, json=summary_request)
215 |
216 | if summary_response.status_code != 202:
217 | print(f"❌ Summary query request failed: {summary_response.status_code}")
218 | else:
219 | print(f"✅ Summary query request accepted")
220 | status["summary_requested"] = True
221 | else:
222 | print(f"❌ Query failed: {data.get('error', 'Unknown error')}")
223 | status["done"] = True
224 |
225 | # Handle summary query response
226 | elif "id" in data and data["id"] == 4:
227 | if "result" in data:
228 | print(f"✅ Summary query succeeded with {data['result'].get('row_count', 0)} rows")
229 | # Print the summary data nicely formatted
230 | if "preview_rows" in data["result"]:
231 | for row in data["result"]["preview_rows"]:
232 | print(f" {row}")
233 | else:
234 | print(f"❌ Summary query failed: {data.get('error', 'Unknown error')}")
235 |
236 | print("\n🏁 All tests completed successfully!")
237 | status["done"] = True
238 | break
239 |
240 | except json.JSONDecodeError as e:
241 | print(f"❌ Error parsing message: {e}")
242 | except Exception as e:
243 | print(f"❌ Unexpected error: {e}")
244 |
245 | # Break out of the event loop if we're done
246 | if status["done"]:
247 | break
248 |
249 | # If we didn't receive any events, wait a bit before trying again
250 | if not events_received:
251 | time.sleep(0.5)
252 |
253 | # Check if we timed out
254 | if time.time() >= timeout and not status["done"]:
255 | print("⏱️ Timeout waiting for responses")
256 |
257 | except KeyboardInterrupt:
258 | print("\n🛑 Interrupted by user. Exiting...")
259 | except Exception as e:
260 | print(f"❌ Error: {e}")
261 | finally:
262 | # Close the SSE connection
263 | print("\n👋 Closing SSE connection...")
264 | sse_response.close()
265 | print("✅ Connection closed")
266 |
267 | if __name__ == "__main__":
268 | test_mcp()
```
--------------------------------------------------------------------------------
/src/trino_mcp/server.py:
--------------------------------------------------------------------------------
```python
1 | """
2 | Main module for the Trino MCP server.
3 | """
4 | from __future__ import annotations
5 |
6 | import argparse
7 | import json
8 | import sys
9 | import os
10 | import asyncio
11 | import time
12 | from contextlib import asynccontextmanager
13 | from dataclasses import dataclass
14 | from typing import AsyncIterator, Dict, Any, List, Optional
15 |
16 | import uvicorn
17 | from fastapi import FastAPI, Response, Body
18 | from fastapi.responses import JSONResponse
19 | from pydantic import BaseModel
20 | from loguru import logger
21 | from mcp.server.fastmcp import Context, FastMCP
22 |
23 | from trino_mcp.config import ServerConfig, TrinoConfig
24 | from trino_mcp.resources import register_trino_resources
25 | from trino_mcp.tools import register_trino_tools
26 | from trino_mcp.trino_client import TrinoClient
27 |
28 | # Global app context for health check access
29 | app_context_global = None
30 |
31 | @dataclass
32 | class AppContext:
33 | """Application context passed to all MCP handlers."""
34 | trino_client: TrinoClient
35 | config: ServerConfig
36 | is_healthy: bool = True
37 |
38 | # Models for the LLM API
39 | class QueryRequest(BaseModel):
40 | """Model for query requests."""
41 | query: str
42 | catalog: str = "memory"
43 | schema: Optional[str] = None
44 | explain: bool = False
45 |
46 | class QueryResponse(BaseModel):
47 | """Model for query responses."""
48 | success: bool
49 | message: str
50 | results: Optional[Dict[str, Any]] = None
51 |
52 | @asynccontextmanager
53 | async def app_lifespan(mcp: FastMCP) -> AsyncIterator[AppContext]:
54 | """
55 | Manage the application lifecycle.
56 |
57 | Args:
58 | mcp: The MCP server instance.
59 |
60 | Yields:
61 | AppContext: The application context with initialized services.
62 | """
63 | global app_context_global
64 |
65 | logger.info("Initializing Trino MCP server")
66 |
67 | # Get server configuration from environment or command line
68 | config = parse_args()
69 |
70 | # Initialize Trino client
71 | trino_client = TrinoClient(config.trino)
72 |
73 | # Create and set global app context
74 | app_context = AppContext(trino_client=trino_client, config=config)
75 | app_context_global = app_context
76 |
77 | try:
78 | # Connect to Trino
79 | logger.info(f"Connecting to Trino at {config.trino.host}:{config.trino.port}")
80 | trino_client.connect()
81 |
82 | # Register resources and tools
83 | logger.info("Registering resources and tools")
84 | register_trino_resources(mcp, trino_client)
85 | register_trino_tools(mcp, trino_client)
86 |
87 | # Yield the application context
88 | logger.info("Trino MCP server initialized and ready")
89 | yield app_context
90 | except Exception as e:
91 | logger.error(f"Failed to initialize: {e}")
92 | app_context.is_healthy = False
93 | yield app_context
94 | finally:
95 | # Cleanup on shutdown
96 | logger.info("Shutting down Trino MCP server")
97 | if trino_client.conn:
98 | trino_client.disconnect()
99 | app_context.is_healthy = False
100 |
101 |
102 | def parse_args() -> ServerConfig:
103 | """
104 | Parse command line arguments and return server configuration.
105 |
106 | Returns:
107 | ServerConfig: The server configuration.
108 | """
109 | parser = argparse.ArgumentParser(description="Trino MCP server")
110 |
111 | # Server configuration
112 | parser.add_argument("--name", default="Trino MCP", help="Server name")
113 | parser.add_argument("--version", default="0.1.0", help="Server version")
114 | parser.add_argument("--transport", default="stdio", choices=["stdio", "sse"], help="Transport type")
115 | parser.add_argument("--host", default="127.0.0.1", help="Host for HTTP server (SSE transport only)")
116 | parser.add_argument("--port", type=int, default=3000, help="Port for HTTP server (SSE transport only)")
117 | parser.add_argument("--debug", action="store_true", help="Enable debug mode")
118 |
119 | # Trino connection
120 | parser.add_argument("--trino-host", default="localhost", help="Trino host")
121 | parser.add_argument("--trino-port", type=int, default=8080, help="Trino port")
122 | parser.add_argument("--trino-user", default="trino", help="Trino user")
123 | parser.add_argument("--trino-password", help="Trino password")
124 | parser.add_argument("--trino-catalog", help="Default Trino catalog")
125 | parser.add_argument("--trino-schema", help="Default Trino schema")
126 | parser.add_argument("--trino-http-scheme", default="http", help="Trino HTTP scheme")
127 |
128 | args = parser.parse_args()
129 |
130 | # Create Trino configuration
131 | trino_config = TrinoConfig(
132 | host=args.trino_host,
133 | port=args.trino_port,
134 | user=args.trino_user,
135 | password=args.trino_password,
136 | catalog=args.trino_catalog,
137 | schema=args.trino_schema,
138 | http_scheme=args.trino_http_scheme
139 | )
140 |
141 | # Create server configuration
142 | server_config = ServerConfig(
143 | name=args.name,
144 | version=args.version,
145 | transport_type=args.transport,
146 | host=args.host,
147 | port=args.port,
148 | debug=args.debug,
149 | trino=trino_config
150 | )
151 |
152 | return server_config
153 |
154 |
155 | def create_app() -> FastMCP:
156 | """
157 | Create and configure the MCP server application.
158 |
159 | Returns:
160 | FastMCP: The configured MCP server.
161 | """
162 | # Create the MCP server with lifespan management
163 | mcp = FastMCP(
164 | "Trino MCP",
165 | dependencies=["trino>=0.329.0"],
166 | lifespan=app_lifespan
167 | )
168 |
169 | return mcp
170 |
171 |
172 | def create_health_app() -> FastAPI:
173 | """
174 | Create a FastAPI app that provides a health check endpoint and LLM API.
175 |
176 | This function creates a FastAPI app with a health check endpoint and
177 | a query endpoint for LLMs to use.
178 |
179 | Returns:
180 | FastAPI: The FastAPI app with health check and LLM API endpoints.
181 | """
182 | app = FastAPI(
183 | title="Trino MCP API",
184 | description="API for health checks and LLM query access to Trino MCP",
185 | version="0.1.0"
186 | )
187 |
188 | @app.get("/health")
189 | async def health():
190 | global app_context_global
191 |
192 | # For Docker health check, always return 200 during startup
193 | # This gives the app time to initialize
194 | return JSONResponse(
195 | status_code=200,
196 | content={"status": "ok", "message": "Health check endpoint is responding"}
197 | )
198 |
199 | @app.post("/api/query", response_model=QueryResponse)
200 | async def query(request: QueryRequest):
201 | """
202 | Execute a SQL query against Trino and return results.
203 |
204 | This endpoint is designed to be used by LLMs to query Trino through MCP.
205 | """
206 | global app_context_global
207 |
208 | if not app_context_global or not app_context_global.is_healthy:
209 | return JSONResponse(
210 | status_code=503,
211 | content={
212 | "success": False,
213 | "message": "Trino MCP server is not healthy or not initialized"
214 | }
215 | )
216 |
217 | logger.info(f"LLM API Query: {request.query}")
218 |
219 | try:
220 | # Use the Trino client from the app context
221 | client = app_context_global.trino_client
222 |
223 | # Optionally add EXPLAIN
224 | query = request.query
225 | if request.explain:
226 | query = f"EXPLAIN {query}"
227 |
228 | # Execute the query
229 | result = client.execute_query(query, request.catalog, request.schema)
230 |
231 | # Format the results for the response
232 | formatted_rows = []
233 | for row in result.rows:
234 | # Convert row to dict using column names
235 | row_dict = {}
236 | for i, col in enumerate(result.columns):
237 | row_dict[col] = row[i]
238 | formatted_rows.append(row_dict)
239 |
240 | return {
241 | "success": True,
242 | "message": "Query executed successfully",
243 | "results": {
244 | "query_id": result.query_id,
245 | "columns": result.columns,
246 | "rows": formatted_rows,
247 | "row_count": result.row_count,
248 | "execution_time_ms": result.query_time_ms
249 | }
250 | }
251 |
252 | except Exception as e:
253 | logger.error(f"Error executing query: {e}")
254 | return JSONResponse(
255 | status_code=400,
256 | content={
257 | "success": False,
258 | "message": f"Error executing query: {str(e)}"
259 | }
260 | )
261 |
262 | @app.get("/api")
263 | async def api_root():
264 | """Root API endpoint with usage instructions."""
265 | return {
266 | "message": "Trino MCP API for LLMs",
267 | "version": app_context_global.config.version if app_context_global else "unknown",
268 | "endpoints": {
269 | "health": "GET /health - Check server health",
270 | "query": "POST /api/query - Execute SQL queries"
271 | },
272 | "query_example": {
273 | "query": "SELECT * FROM memory.bullshit.real_bullshit_data LIMIT 3",
274 | "catalog": "memory",
275 | "schema": "bullshit"
276 | }
277 | }
278 |
279 | return app
280 |
281 |
282 | def main() -> None:
283 | """
284 | Main entry point for the server.
285 | """
286 | config = parse_args()
287 | mcp = create_app()
288 |
289 | # ADDING EXPLICIT CONTEXT INITIALIZATION HERE
290 | global app_context_global
291 | try:
292 | # Initialize the Trino client
293 | logger.info(f"Connecting to Trino at {config.trino.host}:{config.trino.port}")
294 | trino_client = TrinoClient(config.trino)
295 | trino_client.connect()
296 |
297 | # Create application context
298 | app_context = AppContext(
299 | trino_client=trino_client,
300 | config=config,
301 | is_healthy=True
302 | )
303 |
304 | # Set global context
305 | app_context_global = app_context
306 |
307 | # Register resources and tools
308 | register_trino_resources(mcp, trino_client)
309 | register_trino_tools(mcp, trino_client)
310 |
311 | logger.info("Trino MCP server initialized and ready")
312 | except Exception as e:
313 | logger.error(f"Error initializing Trino MCP: {e}")
314 | if app_context_global:
315 | app_context_global.is_healthy = False
316 |
317 | if config.transport_type == "stdio":
318 | # For STDIO transport, run directly
319 | logger.info("Starting Trino MCP server with STDIO transport")
320 | mcp.run()
321 | else:
322 | # For SSE transport, use run_sse_async method from MCP library
323 | logger.info(f"Starting Trino MCP server with SSE transport on {config.host}:{config.port}")
324 |
325 | # In MCP 1.3.0, run_sse_async takes no arguments
326 | # We set the environment variables to configure the host and port
327 | os.environ["MCP_HOST"] = config.host
328 | os.environ["MCP_PORT"] = str(config.port)
329 |
330 | # Configure more robust error handling for the server
331 | import traceback
332 | try:
333 | # Try to import and configure SSE settings if available in this version
334 | from mcp.server.sse import configure_sse
335 | configure_sse(ignore_client_disconnect=True)
336 | logger.info("Configured SSE with ignore_client_disconnect=True")
337 | except (ImportError, AttributeError):
338 | logger.warning("Could not configure SSE settings - this may be expected in some MCP versions")
339 |
340 | # Start a separate thread for the health check endpoint
341 | import threading
342 |
343 | def run_health_check():
344 | """Run the health check FastAPI app."""
345 | health_app = create_health_app()
346 | # Use a different port for the health check endpoint
347 | health_port = config.port + 1
348 | logger.info(f"Starting API server on port {health_port}")
349 | uvicorn.run(health_app, host=config.host, port=health_port)
350 |
351 | # Start the health check in a separate thread
352 | health_thread = threading.Thread(target=run_health_check)
353 | health_thread.daemon = True
354 | health_thread.start()
355 |
356 | # Now run the SSE server with robust error handling
357 | try:
358 | asyncio.run(mcp.run_sse_async())
359 | except RuntimeError as e:
360 | if "generator didn't stop after athrow()" in str(e):
361 | logger.error(f"Generator error in SSE server. This is a known issue with MCP 1.3.0: {e}")
362 |
363 | # Set unhealthy status for health checks
364 | if app_context_global:
365 | app_context_global.is_healthy = False
366 |
367 | logger.info("Server will continue running but may not function correctly.")
368 |
369 | # Keep the server alive despite the error
370 | import time
371 | while True:
372 | time.sleep(60) # Sleep to keep the container running
373 |
374 | else:
375 | logger.error(f"Fatal error running SSE server: {e}")
376 | logger.error(traceback.format_exc())
377 | raise
378 | except Exception as e:
379 | logger.error(f"Fatal error running SSE server: {e}")
380 | logger.error(traceback.format_exc())
381 | raise
382 |
383 |
384 | if __name__ == "__main__":
385 | logger.remove()
386 | logger.add(sys.stderr, level="DEBUG")
387 | main()
388 |
```