WIP: Make the dummy provider less... dummy

dangerzone/isolation_provider/dummy.py

@@ -6,6 +6,8 @@ import sys
 import time
 from typing import Callable, Optional
 
+from ..document import Document
+from ..conversion.common import DangerzoneConverter
 from ..document import Document
 from ..util import get_resource_path
 from .base import IsolationProvider, terminate_process_group
@@ -13,6 +15,18 @@ from .base import IsolationProvider, terminate_process_group
 log = logging.getLogger(__name__)
 
 
+def dummy_script() -> None:
+    sys.stdin.read()
+
+    pages = 2
+    width = height = 9
+    DangerzoneConverter._write_int(pages)
+    for page in range(pages):
+        DangerzoneConverter._write_int(width)
+        DangerzoneConverter._write_int(height)
+        DangerzoneConverter._write_bytes(width * height * 3 * b"A")
+
+
 class Dummy(IsolationProvider):
     """Dummy Isolation Provider (FOR TESTING ONLY)
 
@@ -32,50 +46,19 @@ class Dummy(IsolationProvider):
     def install(self) -> bool:
         return True
 
-    def convert(
-        self,
-        document: Document,
-        ocr_lang: Optional[str],
-        progress_callback: Optional[Callable] = None,
-    ) -> None:
-        self.progress_callback = None
-        log.debug("Dummy converter started:")
-        log.debug(
-            f"  - document: {os.path.basename(document.input_filename)} ({document.id})"
-        )
-        log.debug(f"  - ocr     : {ocr_lang}")
-        log.debug("\n(simulating conversion)")
-        success = True
-        progress = [
-            [False, "Converting to PDF using GraphicsMagick", 0.0],
-            [False, "Separating document into pages", 3.0],
-            [False, "Converting page 1/1 to pixels", 5.0],
-            [False, "Converted document to pixels", 50.0],
-            [False, "Converting page 1/1 from pixels to PDF", 50.0],
-            [False, "Merging 1 pages into a single PDF", 95.0],
-            [False, "Compressing PDF", 97.0],
-            [False, "Safe PDF created", 100.0],
-        ]
-        for error, text, percentage in progress:
-            self.print_progress(document, error, text, percentage)  # type: ignore [arg-type]
-            if error:
-                success = False
-        if success:
-            shutil.copy(
-                get_resource_path("dummy_document.pdf"), document.output_filename
-            )
-        document.mark_as_safe()
-        if document.archive_after_conversion:
-            document.archive()
-
     def start_doc_to_pixels_proc(self, document: Document) -> subprocess.Popen:
-        dummy_cmd = ["python3", "-c", "print('The cake is a lie')"]
+        cmd = [
+            "python3",
+            "-c",
+            "from dangerzone.isolation_provider.dummy import dummy_script;"
+            " dummy_script()"
+        ]
         return subprocess.Popen(
-            dummy_cmd,
+            cmd,
             stdin=subprocess.PIPE,
             stdout=subprocess.PIPE,
             stderr=self.proc_stderr,
-            start_new_session=True,
+            start_new_session=True
         )
 
     def terminate_doc_to_pixels_proc(