def test_copy_dirty(progress):
src = memory.Backend(
mode="r",
data=create_backing("ABCD"),
extents={"dirty": create_dirty_extents("AbCd")},
)
dst_backing = create_backing("0000")
dst = memory.Backend("r+", data=dst_backing)
io.copy(src, dst, dirty=True, max_workers=1, progress=progress)
# Copy dirty extents, skip clean extents.
assert dst_backing == create_backing("A0C0")
def test_zero_repr():
op = ops.Zero(memory.Backend("r+"), 4096)
rep = repr(op)
assert "Zero" in rep
assert "offset=0" in rep
assert "size=4096" in rep
assert "done=0" in rep
def test_close_error():
def close():
raise IOError("backend error")
with pytest.raises(IOError):
with memory.Backend("r+") as m:
m.close = close
def test_write_flush(extra, dirty):
size = 4096
dst = memory.Backend("r+", bytearray(b"a" * size))
src = io.BytesIO(b"b" * size)
with util.aligned_buffer(4096) as buf:
op = ops.Write(dst, src, buf, size, **extra)
op.run()
assert dst.dirty == dirty
def test_size():
m = memory.Backend("r+", data=bytearray(b"data"))
assert m.size() == 4
assert m.tell() == 0
m.zero(5)
m.seek(3)
assert m.size() == 5
assert m.tell() == 3
def test_read_seek():
src = memory.Backend("r", bytearray(b"0123456789"))
src.seek(8)
dst = io.BytesIO()
with util.aligned_buffer(32) as buf:
op = ops.Read(src, dst, buf, 5)
op.run()
assert dst.getvalue() == b"01234"
def test_copy_dirty_progress():
src = memory.Backend(
mode="r",
data=create_backing("A0C-"),
extents={"dirty": create_zero_extents("A0C-")},
)
dst_backing = create_backing("0000")
dst = memory.Backend("r+", data=dst_backing)
p = FakeProgress()
io.copy(src, dst, dirty=True, max_workers=1, progress=p)
# Report at least every extent.
assert len(p.updates) >= 4
# Report entire image size.
assert sum(p.updates) == len(dst_backing)
def test_zero_after_end():
backing = bytearray(b"x" * 4)
m = memory.Backend("r+", data=backing)
m.seek(8)
m.zero(4)
assert m.tell() == 12
assert m.size() == 12
assert backing == b"x" * 4 + b"\0" * 8
def test_close():
m = memory.Backend("r+")
m.close()
# All operations should fail now with:
# ValueError: I/O operation on closed file
with pytest.raises(ValueError):
m.write("more")
with pytest.raises(ValueError):
m.readinto(bytearray(10))
def test_write_at_end():
backing = bytearray(b"\0" * 4)
m = memory.Backend("r+", data=backing)
m.seek(4)
m.write(b"x" * 4)
assert m.tell() == 8
assert m.size() == 8
assert backing == b"\0" * 4 + b"x" * 4
def test_read_from():
size = 128
src = memory.Backend(data=bytearray(b"x" * size))
dst = memory.ReaderFrom("r+", bytearray(b"y" * size))
buf = bytearray(32)
dst.read_from(src, size, buf)
assert src.tell() == size
assert dst.tell() == size
assert src.data() == dst.data()
def test_write_to():
size = 128
src = memory.WriterTo(data=bytearray(b"x" * size))
dst = memory.Backend("r+", data=bytearray(b"y" * size))
buf = bytearray(32)
src.write_to(dst, size, buf)
assert src.tell() == size
assert dst.tell() == size
assert src.data() == dst.data()
def test_zero_seek():
dst = memory.Backend("r+", bytearray(b"a" * 10))
dst.seek(8)
op = ops.Zero(dst, 5)
op.run()
dst.seek(0)
b = bytearray(11)
n = dst.readinto(b)
assert n == 10
assert b == b"\0\0\0\0\0aaaaa\0"
def test_propagate_user_error():
class UserError(Exception):
pass
def close():
raise IOError("backend error")
with pytest.raises(UserError):
with memory.Backend("r+") as m:
m.close = close
raise UserError("user error")
def test_open_writeonly():
m = memory.Backend("w")
assert not m.readable()
assert m.writable()
data = b"data"
m.write(data)
assert m.tell() == len(data)
with pytest.raises(IOError):
m.readinto(bytearray(10))
m.flush()
def test_write_seek():
dst = memory.Backend("r+", bytearray(b"a" * 10))
dst.seek(8)
src = io.BytesIO(b"b" * 5)
with util.aligned_buffer(32) as buf:
op = ops.Write(dst, src, buf, 5)
op.run()
dst.seek(0)
b = bytearray(11)
n = dst.readinto(b)
assert n == 10
assert b == b"bbbbbaaaaa\0"
def test_read_from_some():
src = memory.Backend(data=bytearray(b"x" * 128))
dst = memory.ReaderFrom("r+", data=bytearray(b"y" * 128))
buf = bytearray(32)
src.seek(32)
dst.seek(32)
dst.read_from(src, 64, buf)
assert src.tell() == 96
assert dst.tell() == 96
assert dst.data() == b"y" * 32 + b"x" * 64 + b"y" * 32
def test_write_inside():
backing = bytearray(b"\0" * 8)
m = memory.Backend("r+", data=backing)
m.write(b"x" * 4)
assert m.tell() == 4
assert m.size() == 8
assert backing == b"x" * 4 + b"\0" * 4
m.write(b"x" * 4)
assert m.tell() == 8
assert m.size() == 8
assert backing == b"x" * 8
def test_copy_generic(buffer_size, zero, hole, progress):
src_extents = create_zero_extents("B0-")
src_backing = create_backing("B0-")
dst_backing = create_backing(
"AAA" if zero and hole else "AA0" if zero else "A00")
src = memory.Backend(mode="r",
data=src_backing,
extents={"zero": src_extents})
dst = memory.Backend("r+", data=dst_backing)
io.copy(src,
dst,
max_workers=1,
buffer_size=buffer_size,
zero=zero,
hole=hole,
progress=progress)
assert dst_backing == src_backing
def test_open_readonly():
m = memory.Backend()
assert m.readable()
assert not m.writable()
with pytest.raises(IOError):
m.write(b"data")
with pytest.raises(IOError):
m.zero(4)
assert m.tell() == 0
b = bytearray(b"before")
assert m.readinto(b) == 0
assert b == b"before"
def test_write_to_some():
size = 128
src = memory.WriterTo(data=bytearray(b"x" * size))
dst = memory.Backend("r+", data=bytearray(b"y" * size))
buf = bytearray(32)
src.seek(32)
dst.seek(32)
src.write_to(dst, 64, buf)
assert src.tell() == 96
assert dst.tell() == 96
assert dst.data() == b"y" * 32 + b"x" * 64 + b"y" * 32
def test_user_extents():
extents = {
"zero": [
extent.ZeroExtent(0, 32, False, False),
extent.ZeroExtent(0, 32, True, False),
],
"dirty": [
extent.DirtyExtent(0, 16, True, False),
extent.DirtyExtent(0, 48, False, False),
]
}
data = b"a" * 32 + b"\0" * 32
m = memory.Backend(data=data, extents=extents)
assert list(m.extents()) == extents["zero"]
assert list(m.extents("zero")) == extents["zero"]
assert list(m.extents("dirty")) == extents["dirty"]
def test_open_read_write():
m = memory.Backend("r+")
assert m.readable()
assert m.writable()
assert not m.sparse
data = b"data"
m.write(data)
assert m.tell() == len(data)
m.zero(4)
size = len(data) + 4
assert m.tell() == size
content = data + b"\0" * 4
b = bytearray(size)
m.seek(0)
assert m.readinto(b) == size
assert b == content
def test_dirty():
# backend created clean
m = memory.Backend("r+", data=bytearray(b"data"))
assert not m.dirty
# write ans zero dirty the backend
m.write(b"01234")
assert m.dirty
m.flush()
assert not m.dirty
m.zero(5)
assert m.dirty
m.flush()
assert not m.dirty
# readinto, seek do not affect dirty.
b = bytearray(10)
m.seek(0)
assert not m.dirty
m.readinto(b)
assert not m.dirty
def test_clone():
backing = bytearray(b"x" * 128)
a = memory.Backend(mode="r+", data=backing)
b = a.clone()
# Backends are indentical on creation.
assert a.size() == b.size()
assert a.tell() == b.tell()
assert a.data() == b.data()
# Writng to a modifies the shared backing but does not modify b position.
a.write(b"y" * 64)
assert a.tell() == 64
assert b.tell() == 0
assert a.dirty
assert not b.dirty
assert a.data() == b.data()
# Writng to b modifies the shared backing but does not modify a position.
b.seek(64)
b.write(b"y" * 64)
assert a.tell() == 64
assert b.tell() == 128
assert b.dirty
assert a.data() == b.data()
# Extending the backing show in both backends.
a.seek(128)
a.zero(64)
assert a.tell() == 192
assert b.tell() == 128
assert a.size() == b.size()
assert a.data() == b.data()
# Flusing clears only the flushed backed.
a.flush()
assert not a.dirty
assert b.dirty
b.flush()
assert not b.dirty
def test_invalid_mode():
with pytest.raises(ValueError):
memory.Backend("invalid")
def test_flush_repr():
op = ops.Flush(memory.Backend("r"))
rep = repr(op)
assert "Flush" in rep
assert "done=0" in rep
def test_flush():
dst = memory.Backend("r+")
dst.write(b"x")
op = ops.Flush(dst)
op.run()
assert not dst.dirty
def test_zero_flush(extra, dirty):
size = 4096
dst = memory.Backend("r+", bytearray(b"a" * size))
op = ops.Zero(dst, size, **extra)
op.run()
assert dst.dirty == dirty
def test_extents_dirty():
m = memory.Backend(data=bytearray(b"data"))
with pytest.raises(errors.UnsupportedOperation):
list(m.extents(context="dirty"))