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fix(logging): attribute each query to its analyst caller

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The BearerAuth middleware matched a per-analyst token but only stashed it on
request.state, which the FastMCP tools never see — so the query log line logged
rows/sql with no caller, defeating the per-token attribution the auth design
promises. Bridge the caller name through a ContextVar (anyio propagates it into
the worker thread that runs each sync tool) and include it in the query() log.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
kiania 2026-06-26 16:54:07 +03:00
parent fae40942a2
commit af6fdbcd3f
1 changed files with 12 additions and 1 deletions
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13
analytics_mcp.py
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@ -26,6 +26,7 @@ Env:
"""
from __future__ import annotations
import contextvars
import hmac
import logging
import os
@ -65,6 +66,12 @@ def _get_logger(name: str) -> logging.Logger:
log = _get_logger("server")
# Per-request caller name, set by BearerAuth from the matched token so the tools can
# attribute each query to an analyst in the logs. A ContextVar (not a tool arg) because
# FastMCP tools never receive the HTTP request; anyio propagates the context into the
# worker thread that runs each sync tool. Defaults to "?" if auth ever didn't run.
_caller_var: contextvars.ContextVar[str] = contextvars.ContextVar("caller", default="?")
DATABASE_URL = os.environ["DATABASE_URL"] # analytics_ro DSN (set by deploy)
MAX_ROWS_CEIL = int(os.getenv("MCP_MAX_ROWS", "10000"))
# Schemas the introspection helpers (list_tables/describe_table/sample_table) expose.
@ -284,7 +291,10 @@ def query(sql: str, max_rows: int = 1000) -> dict:
truncated = len(rows) > cap
rows = rows[:cap]
dur_ms = int((time.monotonic() - t0) * 1000)
log.info("query rows=%d trunc=%s %dms :: %s", len(rows), truncated, dur_ms, sql[:200])
log.info(
"query caller=%s rows=%d trunc=%s %dms :: %s",
_caller_var.get(), len(rows), truncated, dur_ms, sql[:200],
)
return {"row_count": len(rows), "truncated": truncated, "rows": rows}
@ -393,6 +403,7 @@ class BearerAuth(BaseHTTPMiddleware):
if caller is None:
return JSONResponse({"error": "unauthorized"}, status_code=401)
request.state.caller = caller
_caller_var.set(caller) # so the tools can attribute the query in the logs
return await call_next(request)