initial commit

logFileModel.py

@@ -0,0 +1,30 @@
+from typing import List
+import os
+from line import Line
+
+
+class LogFileModel:
+    def __init__(self, file):
+        self._file = file
+
+    def data(self, byte_offset:int, lines: int) -> List[Line]:
+        result : List[Line] = []
+
+        # TODO handle lines longer than 4096 bytes
+        with open(self._file, 'r') as f:
+            offset = max(0, byte_offset - 4096)
+            offset = offset - offset % 4096 # align to blocks of 4kb
+            f.seek(offset)
+            while l := f.readline():
+                new_offset = f.tell()
+                if offset >= byte_offset:
+                    line = Line(offset, new_offset-1, l)
+                    result.append(line)
+                offset = new_offset
+                if len(result) >= lines:
+                    break
+
+        return result
+
+    def byte_count(self) -> int:
+        return os.stat(self._file).st_size