fix: Wonder Ink prints without crashing, and prints worksheets at all
Little Waders, 0.2.2: SIGSEGV in QPrinter::resolution() every time a teacher confirmed a print job. QWebEngineView.print() keeps the raw QPrinter pointer and returns; Qt's didPrintPage() reads printer->resolution() once Chromium has rendered the page, and by then PyQt had deleted the printer, which print_view() held only as a local. Reproduced in the lab with the 0.2.2 code, same backtrace, no job. Keeping the printer alive fixed the crash and was measured, and Qt's path was still not a print path: a worksheet PDF tab printed as one blank page, a lesson went as 24.6 MB of 300 dpi pictures with no text, and a queue refusing jobs was reported as printed. Print is now: make a PDF (a worksheet already is one; a lesson page is printToPdf'd onto the printer's own paper; an inline PDF is downloaded and opened as a worksheet), show it in a preview with printer, pages, copies and colour, and hand it to CUPS with lp — Chrome's route in the same rooms. Nothing asynchronous holds a printer. Black and white uses the driver's ColorModel=Grayscale, because Elmer's generic PCL 6 driver ignores print-color-mode. An exception escaping any slot no longer aborts Wonder Ink: PyQt6's default is to kill the process, and it is now logged instead. tests/test-classroom-printing.sh: 50 checks. tools/lab/wonderink-print- check: 39 checks over 13 scenarios in the lab, against a queue built from Elmer's PPD, judged by what CUPS received. Not yet on paper. Co-Authored-By: Claude Opus 5.5 <[email protected]>
This commit is contained in:
ekklesia
co-authored by
Claude Opus 5.5
Claude Opus 5.5
parent
690ef95aff
commit
10433b850d
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"""Drive Wonder Ink's print preview through one scenario, headless.
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usage: wonderink-print-rig.py WONDERINK_COMMAND SCENARIO
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Run by tools/lab/wonderink-print-check inside the lab, against the
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command the package installed. It presses the preview's own buttons the
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way a teacher would, and prints what happened; the check around it asks
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CUPS what actually arrived.
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"""
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import importlib.machinery, importlib.util, sys, time, faulthandler, gc, os
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faulthandler.enable()
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path, scenario = sys.argv[1], sys.argv[2]
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loader = importlib.machinery.SourceFileLoader("wonderink", path)
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spec = importlib.util.spec_from_loader("wonderink", loader)
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wi = importlib.util.module_from_spec(spec); loader.exec_module(wi)
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from pathlib import Path
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from PyQt6.QtCore import QTimer, QUrl
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from PyQt6.QtGui import QPdfWriter, QPainter, QFont, QPageSize
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from PyQt6.QtWidgets import QApplication
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from PyQt6.QtWebEngineCore import QWebEngineProfile, QWebEngineSettings
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notes = []
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wi.notify = lambda s, b: (notes.append(s), print("NOTIFY", s, "|", b, flush=True))
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app = QApplication(sys.argv)
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profile = QWebEngineProfile("rig", app)
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for a in ("PdfViewerEnabled", "PluginsEnabled"):
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profile.settings().setAttribute(getattr(QWebEngineSettings.WebAttribute, a), True)
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window = wi.WonderInk(profile)
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profile.downloadRequested.connect(window.on_download)
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window.resize(1280, 800); window.show()
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t0 = time.monotonic()
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def stamp(m): print(f"[{time.monotonic()-t0:6.2f}s] {m}", flush=True)
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def lesson(view, title="Noahs Ark lesson"):
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view.setHtml(f"<html><head><title>{title}</title></head><body>" + "".join(
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f"<h1>{title}, part {i}</h1><p>{'Noah built an ark. ' * 80}</p>" for i in range(5)
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) + "</body></html>", QUrl("https://app.wonderink.org/lesson"))
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def worksheet(name="Colour the Ark"):
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d = wi.DOWNLOADS; d.mkdir(parents=True, exist_ok=True)
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p = d / f"{name}.pdf"
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w = QPdfWriter(str(p)); w.setPageSize(QPageSize(QPageSize.PageSizeId.Letter)); w.setResolution(300)
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pa = QPainter(w); pa.setFont(QFont("DejaVu Sans", 28))
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pa.drawText(200, 400, f"WORKSHEET {name} page one"); pa.drawRect(200, 600, 2000, 1500)
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w.newPage(); pa.drawText(200, 400, f"WORKSHEET {name} page two"); pa.end()
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return p
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def when(cond, then, label, limit=30):
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start = time.monotonic()
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def poll():
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try: ok = cond()
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except Exception as e: ok = False
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if ok: return then()
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if time.monotonic() - start > limit:
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stamp(f"GAVE UP waiting for {label}"); app.exit(4); return
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QTimer.singleShot(100, poll)
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QTimer.singleShot(100, poll)
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def preview(): return window._preview
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def ready(): return preview() is not None and preview()._pdf is not None
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def describe(d):
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return f"pages={d._pages} printers={[d._printer.itemText(i) for i in range(d._printer.count())]} paper={d.paper()} colour_offered={d._colour.isVisible()} status={d._status.text()!r}"
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def finish(code=0):
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stamp(f"RESULT notes={notes} preview_open={preview() is not None} tabs={window._tabs.count()}")
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QTimer.singleShot(1500, lambda: app.exit(code))
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def press_print(then=None):
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d = preview(); stamp("PREVIEW " + describe(d))
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d._print.click()
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stamp(f"after Print: open={preview() is not None} status={d._status.text() if preview() else ''!r}")
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(then or finish)()
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actions = {
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"web": lambda view: when(ready, press_print, "preview"),
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"cancel": lambda view: when(ready, lambda: (stamp("PREVIEW " + describe(preview())), preview()._cancel.click(), finish()), "preview"),
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"options": lambda view: when(ready, lambda: (
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preview()._which.setCurrentIndex(1), preview()._range.setText("2-3"),
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preview()._copies.setValue(2), preview()._colour.setCurrentIndex(1), press_print()), "preview"),
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"bad-range": lambda view: when(ready, lambda: (
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preview()._which.setCurrentIndex(1), preview()._range.setText("7"), preview()._print.click(),
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stamp(f"bad range: open={preview() is not None} status={preview()._status.text()!r}"),
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preview()._range.setText("1"), press_print()), "preview"),
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"broken": lambda view: when(ready, lambda: (
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preview()._printer.setCurrentText("Refusing"),
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stamp(f"switched to Refusing: paper={preview().paper()} status={preview()._status.text()!r}"),
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when(ready, lambda: (
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stamp(f"re-rendered on {preview().paper()}: pages={preview()._pages}"),
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preview()._print.click(),
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stamp(f"broken: open={preview() is not None} status={preview()._status.text()!r}"),
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preview()._cancel.click(), finish()), "re-render")), "preview"),
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"page-closes-itself": lambda view: when(ready, lambda: (
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view.page().runJavaScript("window.close()"),
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when(lambda: preview() and "closed" in preview()._status.text(), lambda: (
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stamp(f"after page closed: status={preview()._status.text()!r} print_enabled={preview()._print.isEnabled()}"),
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preview()._cancel.click(), finish()), "closed message")), "preview"),
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"close-window": lambda view: when(ready, lambda: (stamp("closing window with preview open"), window.close()), "preview"),
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"page-prints-again": lambda view: when(ready, lambda: (
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view.page().runJavaScript("window.print()"),
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QTimer.singleShot(800, lambda: (stamp(f"second request while open: still one preview={preview() is not None}"), press_print()))), "preview"),
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}
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if scenario == "repeat":
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view = window.open_tab(); lesson(view); n = [0]
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def once():
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if n[0] == 5: return finish()
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n[0] += 1; QTimer.singleShot(0, lambda: window.print_view(view))
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when(ready, lambda: press_print(then=lambda: QTimer.singleShot(200, once)), "preview")
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view.loadFinished.connect(lambda ok: once() if n[0] == 0 else None)
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elif scenario in ("pdf", "pdf-options"):
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window.open_pdf(worksheet()); view = window.current()
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if scenario == "pdf-options":
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actions["pdf-options"] = lambda view: when(ready, lambda: (
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preview()._which.setCurrentIndex(1), preview()._range.setText("2"),
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preview()._copies.setValue(3), preview()._colour.setCurrentIndex(1), press_print()), "preview")
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QTimer.singleShot(2500, lambda: (QTimer.singleShot(0, lambda: window.print_view(view)),
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actions[scenario if scenario == "pdf-options" else "web"](view)))
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elif scenario == "pdf-viewer-button":
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# The viewer's own print button reaches the page as a print request.
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window.open_pdf(worksheet()); view = window.current()
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QTimer.singleShot(2500, lambda: (actions["web"](view), view.page().printRequested.emit()))
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elif scenario == "inline":
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view = window.open_tab(); view.load(QUrl("http://127.0.0.1:8088/ark.pdf"))
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QTimer.singleShot(4000, lambda: (stamp(f"inline mime={window._mime.get(view)!r} shows_pdf={window._shows_pdf(view)}"),
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QTimer.singleShot(0, lambda: window.print_view(view)),
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when(ready, lambda: (stamp(f"worksheet tab opened: tabs={window._tabs.count()} current_is_pdf={window.current() in window._pdf_views}"), press_print()), "inline preview")))
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else:
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if scenario == "page-closes-itself":
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lesson(window.open_tab(), "The other lesson")
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view = window.open_tab(); lesson(view)
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fired = []
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def go(ok):
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if fired: return
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fired.append(1); QTimer.singleShot(0, lambda: window.print_view(view)); actions[scenario](view)
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view.loadFinished.connect(go)
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QTimer.singleShot(90000, lambda: (stamp("TIMEOUT"), app.exit(3)))
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rc = app.exec()
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stamp(f"EXIT {rc} scratch_left={sorted(p.name for p in Path(os.environ.get('XDG_RUNTIME_DIR','/tmp')).glob('wonderink-print-*'))}")
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sys.exit(rc)
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