[LSP] stderr verbose logs for the thought process

[mohammedahmed18]

PR Type

Enhancement, Bug fix

---

Description

• Enable quiet LSP logs by default

• Prefix LSP logs via helper wrapper

• Adjust logging target to rich logger

• Avoid empty refinement log updates

---

Diagram Walkthrough

flowchart LR
  A["LSP env detection"] -- "is_LSP_enabled()" --> B["Console logger wrappers"]
  B -- "lsp_log prefixes :::: when LSP" --> C["Rich logger output"]
  C -- "stderr handler configured" --> D["VS Code output channel"]
  E["Function optimizer"] -- "skip zero-count log" --> F["Cleaner logs"]

Loading

File Walkthrough

	Relevant files
Enhancement	cli.py Enable DEBUG logging when LSP is active                                    codeflash/cli_cmds/cli.py Treat LSP mode as verbose logging. Use is_LSP_enabled to set DEBUG level. +1/-1      console.py Prefix console logs conditionally for LSP                                codeflash/cli_cmds/console.py Import lsp_log helper. Wrap logger.info and logger.debug with lsp_log. Preserve original log functions. +7/-0      helpers.py LSP helpers for env check and log prefixing                            codeflash/lsp/helpers.py Add is_LSP_enabled with caching. Introduce lsp_log wrapper to prefix logs. +8/-0      server_entry.py Configure LSP server to emit via rich logger                          codeflash/lsp/server_entry.py Target "rich" logger, clear its handlers. Add stderr stream handler at DEBUG level. Remove custom formatter and root-level INFO. +2/-4
Bug fix	function_optimizer.py Guard refinement logging on non-empty results                        codeflash/optimization/function_optimizer.py Update candidate count and log only if new items. Prevent logging zero refinements. +6/-4

---

[github-actions]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Type Hint Mismatch The callable type for actual_log_fn in lsp_log likely doesn't match the actual logging function signatures; using a fixed (str, Any, Any) may be too strict and misleading for *args, **kwargs. Consider loosening the type to Callable[..., None] to avoid type-checker issues. def lsp_log(msg: str, actual_log_fn: Callable[[str, Any, Any], None], *args: Any, **kwargs: Any) -> None: # noqa: ANN401 if is_LSP_enabled(): actual_log_fn(f"::::{msg}", *args, **kwargs) else: actual_log_fn(msg, *args, **kwargs) Logger Monkey-Patching Overwriting logger.info and logger.debug with lambdas can break introspection and tooling; consider wrapping via a LoggerAdapter or a custom Handler/Filter to prepend LSP prefixes instead of monkey-patching methods. real_info_log_fn = logger.info logger.info = lambda msg, *args, **kwargs: lsp_log(msg, real_info_log_fn, *args, **kwargs) real_debug_log_fn = logger.debug logger.debug = lambda msg, *args, **kwargs: lsp_log(msg, real_debug_log_fn, *args, **kwargs) Logger Selection Switching to logging.getLogger("rich") may omit logs from other modules; confirm all project logs propagate to this logger or set levels/handlers on the root logger as well to avoid missing messages in the VS Code channel. root_logger = logging.getLogger("rich") root_logger.handlers.clear() # Set up stderr handler for VS Code output channel with [LSP-Server] prefix handler = logging.StreamHandler(sys.stderr) handler.setLevel(logging.DEBUG) # Configure root logger root_logger.addHandler(handler) # Also configure the pygls logger specifically pygls_logger = logging.getLogger("pygls") pygls_logger.setLevel(logging.INFO)

[github-actions]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
Possible issue	Ensure correct root logger setup Targeting the "rich" logger may miss logs emitted by other modules; also root_logger.setLevel is removed, risking logs being filtered by a higher default level. Configure the root logger (getLogger()) and explicitly set its level to DEBUG to ensure stderr logging works reliably. codeflash/lsp/server_entry.py [19-28] -root_logger = logging.getLogger("rich") +root_logger = logging.getLogger() root_logger.handlers.clear() handler = logging.StreamHandler(sys.stderr) handler.setLevel(logging.DEBUG) root_logger.addHandler(handler) +root_logger.setLevel(logging.DEBUG) Suggestion importance[1-10]: 8 __ Why: Accurately notes that switching to "rich" logger and removing setLevel may drop logs; recommending root logger with explicit DEBUG level improves reliability and aligns with typical logging practices.	Medium
	Avoid risky logger monkey-patching Monkey-patching logger.info/debug after obtaining real_*_log_fn can create recursion if other parts rebind the logger, and it bypasses method attributes (like .isEnabledFor). Wrap via a LoggerAdapter or helper that calls lsp_log without reassigning methods directly to avoid hard-to-trace logging issues. codeflash/cli_cmds/console.py [46-51] -real_info_log_fn = logger.info -logger.info = lambda msg, *args, **kwargs: lsp_log(msg, real_info_log_fn, *args, **kwargs) +class _LspLoggerAdapter(logging.LoggerAdapter): + def process(self, msg, kwargs): + return (msg, kwargs) + def info(self, msg, *args, **kwargs): + lsp_log(msg, self.logger.info, *args, **kwargs) + def debug(self, msg, *args, **kwargs): + lsp_log(msg, self.logger.debug, *args, **kwargs) -real_debug_log_fn = logger.debug -logger.debug = lambda msg, *args, **kwargs: lsp_log(msg, real_debug_log_fn, *args, **kwargs) +logger = _LspLoggerAdapter(logger, {}) Suggestion importance[1-10]: 7 __ Why: Valid concern about monkey-patching logger.info/debug; using a LoggerAdapter is safer and maintains logger behavior, though it’s a structural change rather than a critical bug fix.	Medium
General	Prevent unintended LSP-wide verbosity Enabling debug logs solely based on is_LSP_enabled() can unintentionally force verbose logging for all LSP sessions. Gate the LSP-driven verbosity behind a separate env/config or keep LSP default at INFO unless args.verbose is set. This prevents log noise and potential performance impact in production LSP usage. codeflash/cli_cmds/cli.py [114-116] -if args.verbose or is_LSP_enabled(): +if args.verbose or (is_LSP_enabled() and os.getenv("CODEFLASH_LSP_VERBOSE", "false").lower() == "true"): logging_config.set_level(logging.DEBUG, echo_setting=not is_init) Suggestion importance[1-10]: 6 __ Why: Correctly identifies that is_LSP_enabled() forces DEBUG in LSP mode and proposes a reasonable env-gated fix, but it introduces a new env without PR context and requires adding os import, so impact is moderate.	Low

[Saga4]

Maybe we can just have it broken in json object with "message", component. That would be easy for anyone to use.
or lets just drop tags as its confusing.

[mohammedahmed18]

@Saga4 the idea of tags is to use the same message in console and lsp,
sending a json, we would re-write all logger lines, so I think this is the alternative option but dropping it will just not give us control over displaying the messages in the extension (the markdown)

[Saga4]

Okay, lets then we can remove "tags" as delimeter as thats not helping, pipe is enough I guess.

[mohammedahmed18]

yeah right, that would be cleaner

[Saga4]

I think the messaging could be "Generating possible optimizations took {end_time - start_time:.2f} seconds."

or "Candidate generation for optimizations took {end_time - start_time:.2f} seconds."

[codeflash-ai]

⚡️ Codeflash found optimizations for this PR

📄 150% (1.50x) speedup for LspMarkdownMessage.serialize in codeflash/lsp/lsp_message.py

⏱️ Runtime : 6.42 milliseconds → 2.56 milliseconds (best of 68 runs)

I created a new dependent PR with the suggested changes. Please review:

• ⚡️ Speed up method LspMarkdownMessage.serialize by 150% in PR #718 (lsp/verbose-quiet-logs) #738

If you approve, it will be merged into this PR (branch lsp/verbose-quiet-logs).