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scistacklog
The shared logging facade for every scistack layer. This is the lowest-level
package in the stack — it has no dependencies, and every other layer (scifor,
scidb, sciduckdb, …) emits through it or through a plain
logging.getLogger("<layer>") child logger that it covers.
Design
One Log call, two destinations with independent levels:
-
console (stderr) — a concise pipeline narrative for the person running the pipeline. Time-only timestamps; level prefix only at WARN and above.
14:32:06 [scifor] for_each(compute_psd) — 120 iterations: subject=12 values [s01,…,s12] 14:33:15 [scifor] WARN: iteration failed: subject=s03, session=2 — ValueError: bad channel count -
file (
scidb.lognext to the database, pointed viaLog.set_path, done automatically byscidb.configure_database()) — the run document. One record per line: date + millisecond timestamp, level, originating layer.2026-07-07 14:32:06.001 INFO [scifor] for_each(compute_psd) — 120 iterations: subject=12 values [s01,…,s12] 2026-07-07 14:33:20.100 INFO [scidb] [timing] save_batch(PSD): 114 items, 12 schemas, 0.412s
Both sinks default to INFO. DEBUG detail (per-iteration lines, timing phase tables, framework internals) is opt-in:
from scistacklog import Log
Log.set_level("DEBUG", sink="file") # full detail in the file only
Log.set_level("DEBUG") # both sinks
or set the SCIDB_LOG_LEVEL environment variable (applies to both sinks),
or pass -v to the scidb CLI.
Usage
from scistacklog import Log
Log.info("for_each(compute_psd) — 120 iterations", layer="scifor")
Log.debug("combo detail: %s", combo, layer="scifor")
Log.error("save failed", layer="scidb", exc_info=True)
layer must be one of scistacklog.LAYERS
(scidb, scifor, sciduck, scihist, scilineage, scistack,
scistack_gui, matlab).
Timing a hot path
with Log.timer("save_batch(PSD)", extra="114 items") as t:
with t.phase("canonical_hash"): ...
with t.phase("commit"): ...
One INFO summary on exit — [timing] save_batch(PSD): 114 items, TOTAL=0.412s (canonical_hash=0.310s, commit=0.102s) — plus a per-phase table at DEBUG.
TOTAL= appears on the summary line and nowhere else; MATLAB's timing archives
grep for it.
live=True for anything that can run for minutes. A summary is a
post-mortem, and an operation that has not finished yet has no post-mortem: a
25-minute figure save (scidb.log 2026-09-11) logged nothing at all, and a save
that timed out logged nothing ever. A live timer announces each phase as it
starts and as it ends, and enables t.note(...) for progress inside a long
phase:
with Log.timer("save_figure", layer="scistack_gui", live=True) as t:
with t.phase("resolve", extra="2 figure(s)"):
t.note("figure %d/%d", 1, 2)
[timing] save_figure: resolve started — 2 figure(s)
[timing] save_figure: figure 1/2
[timing] save_figure: resolve done in 771.402s
[timing] save_figure: TOTAL=773.918s (resolve=771.402s, render_and_write=2.511s)
t.note is silent on a quiet timer, so the same instrumented code serves a
fast path without flooding it.
Contracts
- caplog: level filtering happens on the two handlers, never on the
loggers — every record propagates to the root logger, so pytest's
caplogcaptures everything regardless of sink levels.Log.*(...)with the default layer emits on logger"scidb", unchanged from the historical implementation. - MATLAB:
scimatlab's+scidb/Log.mdelegates to this class viapy.scidb.log.Log.*(a re-export shim in scidb). The numeric level scale (DEBUG=0 … ERROR=3) and positional call shapes are frozen for that bridge.
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Release files for scistacklog 0.1.42
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