Fix BAML log output across SDK bridges - #4412
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📝 WalkthroughWalkthroughThe bridge captures BAML logs during native SDK calls, filters them by severity, drains them during and after execution, and writes them to stderr. Configuration uses ChangesSDK logging
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to When BAML_LOG is unset, native SDK calls can currently write BAML logs to stderr by default, which may unexpectedly pollute application output; merge should wait for the opt-in behavior to be corrected. The cancellation test also remains vulnerable to intermittent failures under load. Sequence Diagram(s)sequenceDiagram
participant SDKCaller
participant bridge_cffi
participant sdk_logs
participant bex_engine
SDKCaller->>bridge_cffi: invoke BAML call
bridge_cffi->>sdk_logs: configure call context
bridge_cffi->>bex_engine: execute wrapped engine call
sdk_logs->>bex_engine: drain captured logs
sdk_logs-->>SDKCaller: write rendered logs to stderr
bridge_cffi-->>SDKCaller: return encoded result
Suggested reviewers: Poem
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Inline comments:
In `@baml_language/crates/bex_engine/src/value_capture.rs`:
- Around line 121-129: The from_baml_log parser should map an unset BAML_LOG
value (raw == None) to TraceLogLevel::Off so capture is disabled by default.
Preserve the existing mappings for configured values, and update the downstream
parser test covering None to expect Off instead of Info.
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📒 Files selected for processing (10)
baml_language/crates/baml_cli/src/test_command.rsbaml_language/crates/bex_engine/src/lib.rsbaml_language/crates/bex_engine/src/value_capture.rsbaml_language/crates/bex_project/src/lib.rsbaml_language/crates/bridge_cffi/Cargo.tomlbaml_language/crates/bridge_cffi/src/baml_to_host.rsbaml_language/crates/bridge_cffi/src/lib.rsbaml_language/crates/bridge_cffi/src/sdk_logs.rsbaml_language/sdk_tests/crates/python_pydantic2/function_calls/customizable/test_main.pybaml_language/sdk_tests/fixtures/function_calls/baml_src/main.baml
🚧 Files skipped from review as they are similar to previous changes (7)
- baml_language/crates/bridge_cffi/Cargo.toml
- baml_language/crates/bridge_cffi/src/lib.rs
- baml_language/crates/bex_project/src/lib.rs
- baml_language/sdk_tests/fixtures/function_calls/baml_src/main.baml
- baml_language/crates/bex_engine/src/lib.rs
- baml_language/crates/bridge_cffi/src/baml_to_host.rs
- baml_language/crates/bridge_cffi/src/sdk_logs.rs
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Summary
LogOutputimplementation and preserve its precedence: CLI--log, thenBAML_LOG, thenOFFlog.*events to stderr as[BAML LEVEL] ...Root cause
The engine only records
$baml_logevents when a call boundary supplies enabled capture defaults and aTraceCaptureProducer. SDK bridges built theirFunctionCallContextwithout either, so authored BAML log events were discarded before they could reach the host.Integration with #4409
This branch is based on current
canaryand includes #4409 while it is still open. The CLI remains the public owner of--logandBAML_LOGparsing; both its producer and the SDK bridge delegate event filtering to the shared engineTraceLogLevel. Unset or emptyBAML_LOGremainsOFFfor SDK calls.Fixes B-1172.
Validation
cargo fmt --manifest-path baml_language/Cargo.toml --all -- --checkcargo test --manifest-path baml_language/Cargo.toml -p bex_engine value_capture --libcargo test --manifest-path baml_language/Cargo.toml -p bridge_cffi sdk_logs --libcargo test --manifest-path baml_language/Cargo.toml -p baml_cli log_output --libcargo test --manifest-path baml_language/Cargo.toml -p baml_cli --test exit_code_e2e log_sources_ -- --nocapturetools/sdk-parity-lint/run --repo-root . --baseline baml_language/sdk_tests/crates/parity_analysis.md --output /tmp/baml-b1172-final-parity-analysis.mdcargo nextest run --manifest-path baml_language/Cargo.toml -p sdk_test_python_pydantic2 function_calls::pytestcargo clippy --manifest-path baml_language/Cargo.toml -p bex_engine -p bridge_cffi -p baml_cli --all-targets -- -D warningsgit diff --check origin/canary...HEAD