Downloader support resume from connection reset

docs/configuration.md

@@ -273,6 +273,19 @@ values, usage instructions and warnings.
 
 Use parallel execution when using the new (`>=1.1.0`) installer.
 
+### `requests.max-retries`
+
+**Type**: `int`
+
+**Default**: `0`
+
+**Environment Variable**: `POETRY_REQUESTS_MAX_RETRIES`
+
+*Introduced in 1.9.0*
+
+Set the maximum number of retries in an unstable network.
+This setting has no effect if the server does not support HTTP range requests.
+
 ### `solver.lazy-wheel`
 
 **Type**: `boolean`

src/poetry/config/config.py

@@ -127,6 +127,9 @@ class Config:
         "experimental": {
             "system-git-client": False,
         },
+        "requests": {
+            "max-retries": 0,
+        },
         "installer": {
             "parallel": True,
             "max-workers": None,
@@ -316,7 +319,10 @@ def _get_normalizer(name: str) -> Callable[[str], Any]:
         if name == "virtualenvs.path":
             return lambda val: str(Path(val))
 
-        if name == "installer.max-workers":
+        if name in {
+            "installer.max-workers",
+            "requests.max-retries",
+        }:
             return int_normalizer
 
         if name in ["installer.no-binary", "installer.only-binary"]:

src/poetry/console/commands/config.py

@@ -74,6 +74,7 @@ def unique_config_values(self) -> dict[str, tuple[Any, Any]]:
             "virtualenvs.prefer-active-python": (boolean_validator, boolean_normalizer),
             "virtualenvs.prompt": (str, str),
             "experimental.system-git-client": (boolean_validator, boolean_normalizer),
+            "requests.max-retries": (lambda val: int(val) >= 0, int_normalizer),
             "installer.parallel": (boolean_validator, boolean_normalizer),
             "installer.max-workers": (lambda val: int(val) > 0, int_normalizer),
             "installer.no-binary": (

src/poetry/installation/executor.py

@@ -89,6 +89,7 @@ def __init__(
         # Cache whether decorated output is supported.
         # https://github.com/python-poetry/cleo/issues/423
         self._decorated_output: bool = self._io.output.is_decorated()
+        self._max_retries = config.get("requests.max-retries", 0)
 
     @property
     def installations_count(self) -> int:
@@ -719,7 +720,9 @@ def _download_archive(
         url: str,
         dest: Path,
     ) -> None:
-        downloader = Downloader(url, dest, self._authenticator)
+        downloader = Downloader(
+            url, dest, self._authenticator, max_retries=self._max_retries
+        )
         wheel_size = downloader.total_size
 
         operation_message = self.get_operation_message(operation)

src/poetry/packages/direct_origin.py

@@ -7,6 +7,7 @@
 
 from poetry.core.packages.utils.link import Link
 
+from poetry.config.config import Config
 from poetry.inspection.info import PackageInfo
 from poetry.inspection.info import PackageInfoError
 from poetry.utils.authenticator import get_default_authenticator
@@ -57,6 +58,8 @@ def _get_package_from_git(
 class DirectOrigin:
     def __init__(self, artifact_cache: ArtifactCache) -> None:
         self._artifact_cache = artifact_cache
+        config = Config.create()
+        self._max_retries = config.get("requests.max-retries", 0)
         self._authenticator = get_default_authenticator()
 
     @classmethod
@@ -77,7 +80,9 @@ def get_package_from_directory(cls, directory: Path) -> Package:
         return PackageInfo.from_directory(path=directory).to_package(root_dir=directory)
 
     def _download_file(self, url: str, dest: Path) -> None:
-        download_file(url, dest, session=self._authenticator)
+        download_file(
+            url, dest, session=self._authenticator, max_retries=self._max_retries
+        )
 
     def get_package_from_url(self, url: str) -> Package:
         link = Link(url)

src/poetry/repositories/http_repository.py

@@ -66,6 +66,7 @@ def __init__(
         self.get_page = functools.lru_cache(maxsize=None)(self._get_page)
 
         self._lazy_wheel = config.get("solver.lazy-wheel", True)
+        self._max_retries = config.get("requests.max-retries", 0)
         # We are tracking if a domain supports range requests or not to avoid
         # unnecessary requests.
         # ATTENTION: A domain might support range requests only for some files, so the
@@ -95,7 +96,11 @@ def _download(
         self, url: str, dest: Path, *, raise_accepts_ranges: bool = False
     ) -> None:
         return download_file(
-            url, dest, session=self.session, raise_accepts_ranges=raise_accepts_ranges
+            url,
+            dest,
+            session=self.session,
+            raise_accepts_ranges=raise_accepts_ranges,
+            max_retries=self._max_retries,
         )
 
     @contextmanager

src/poetry/utils/helpers.py

@@ -20,6 +20,8 @@
 from typing import Any
 from typing import overload
 
+from requests.exceptions import ChunkedEncodingError
+from requests.exceptions import ConnectionError
 from requests.utils import atomic_open
 
 from poetry.utils.authenticator import get_default_authenticator
@@ -33,6 +35,7 @@
     from types import TracebackType
 
     from poetry.core.packages.package import Package
+    from requests import Response
     from requests import Session
 
     from poetry.utils.authenticator import Authenticator
@@ -133,10 +136,11 @@ def download_file(
     session: Authenticator | Session | None = None,
     chunk_size: int = 1024,
     raise_accepts_ranges: bool = False,
+    max_retries: int = 0,
 ) -> None:
     from poetry.puzzle.provider import Indicator
 
-    downloader = Downloader(url, dest, session)
+    downloader = Downloader(url, dest, session, max_retries=max_retries)
 
     if raise_accepts_ranges and downloader.accepts_ranges:
         raise HTTPRangeRequestSupported(f"URL {url} supports range requests.")
@@ -168,16 +172,13 @@ def __init__(
         url: str,
         dest: Path,
         session: Authenticator | Session | None = None,
+        max_retries: int = 0,
     ):
         self._dest = dest
-
-        session = session or get_default_authenticator()
-        headers = {"Accept-Encoding": "Identity"}
-
-        self._response = session.get(
-            url, stream=True, headers=headers, timeout=REQUESTS_TIMEOUT
-        )
-        self._response.raise_for_status()
+        self._max_retries = max_retries
+        self._session = session or get_default_authenticator()
+        self._url = url
+        self._response = self._get()
 
     @cached_property
     def accepts_ranges(self) -> bool:
@@ -191,10 +192,44 @@ def total_size(self) -> int:
                 total_size = int(self._response.headers["Content-Length"])
         return total_size
 
+    def _get(self, start: int = 0) -> Response:
+        headers = {"Accept-Encoding": "Identity"}
+        if start > 0:
+            headers["Range"] = f"bytes={start}-"
+        response = self._session.get(
+            self._url, stream=True, headers=headers, timeout=REQUESTS_TIMEOUT
+        )
+        response.raise_for_status()
+        return response
+
+    def _iter_content_with_resume(self, chunk_size: int) -> Iterator[bytes]:
+        fetched_size = 0
+        retries = 0
+        while True:
+            try:
+                for chunk in self._response.iter_content(chunk_size=chunk_size):
+                    yield chunk
+                    fetched_size += len(chunk)
+            except (ChunkedEncodingError, ConnectionError):
+                if (
+                    retries < self._max_retries
+                    and self.accepts_ranges
+                    and fetched_size > 0
+                ):
+                    # only retry if server supports byte ranges
+                    # and we have fetched at least one chunk
+                    # otherwise, we should just fail
+                    retries += 1
+                    self._response = self._get(fetched_size)
+                    continue
+                raise
+            else:
+                break
+
     def download_with_progress(self, chunk_size: int = 1024) -> Iterator[int]:
         fetched_size = 0
         with atomic_open(self._dest) as f:
-            for chunk in self._response.iter_content(chunk_size=chunk_size):
+            for chunk in self._iter_content_with_resume(chunk_size=chunk_size):
                 if chunk:
                     f.write(chunk)
                     fetched_size += len(chunk)

tests/config/test_config.py

@@ -34,7 +34,12 @@ def get_options_based_on_normalizer(normalizer: Normalizer) -> Iterator[str]:
 
 
 @pytest.mark.parametrize(
-    ("name", "value"), [("installer.parallel", True), ("virtualenvs.create", True)]
+    ("name", "value"),
+    [
+        ("installer.parallel", True),
+        ("virtualenvs.create", True),
+        ("requests.max-retries", 0),
+    ],
 )
 def test_config_get_default_value(config: Config, name: str, value: bool) -> None:
     assert config.get(name) is value

tests/console/commands/test_config.py

@@ -60,6 +60,7 @@ def test_list_displays_default_value_if_not_set(
 installer.only-binary = null
 installer.parallel = true
 keyring.enabled = true
+requests.max-retries = 0
 solver.lazy-wheel = true
 virtualenvs.create = true
 virtualenvs.in-project = null
@@ -92,6 +93,7 @@ def test_list_displays_set_get_setting(
 installer.only-binary = null
 installer.parallel = true
 keyring.enabled = true
+requests.max-retries = 0
 solver.lazy-wheel = true
 virtualenvs.create = false
 virtualenvs.in-project = null
@@ -145,6 +147,7 @@ def test_unset_setting(
 installer.only-binary = null
 installer.parallel = true
 keyring.enabled = true
+requests.max-retries = 0
 solver.lazy-wheel = true
 virtualenvs.create = true
 virtualenvs.in-project = null
@@ -176,6 +179,7 @@ def test_unset_repo_setting(
 installer.only-binary = null
 installer.parallel = true
 keyring.enabled = true
+requests.max-retries = 0
 solver.lazy-wheel = true
 virtualenvs.create = true
 virtualenvs.in-project = null
@@ -305,6 +309,7 @@ def test_list_displays_set_get_local_setting(
 installer.only-binary = null
 installer.parallel = true
 keyring.enabled = true
+requests.max-retries = 0
 solver.lazy-wheel = true
 virtualenvs.create = false
 virtualenvs.in-project = null
@@ -345,6 +350,7 @@ def test_list_must_not_display_sources_from_pyproject_toml(
 installer.parallel = true
 keyring.enabled = true
 repositories.foo.url = "https://foo.bar/simple/"
+requests.max-retries = 0
 solver.lazy-wheel = true
 virtualenvs.create = true
 virtualenvs.in-project = null

tests/repositories/test_http_repository.py

@@ -80,7 +80,11 @@ def test_get_info_from_wheel(
     else:
         mock_metadata_from_wheel_url.assert_not_called()
         mock_download.assert_called_once_with(
-            url, mocker.ANY, session=repo.session, raise_accepts_ranges=lazy_wheel
+            url,
+            mocker.ANY,
+            session=repo.session,
+            raise_accepts_ranges=lazy_wheel,
+            max_retries=0,
         )
         if lazy_wheel:
             assert repo._supports_range_requests[domain] is False

tests/utils/test_helpers.py

@@ -9,6 +9,7 @@
 import pytest
 
 from poetry.core.utils.helpers import parse_requires
+from requests.exceptions import ChunkedEncodingError
 
 from poetry.utils.helpers import Downloader
 from poetry.utils.helpers import HTTPRangeRequestSupported
@@ -150,6 +151,79 @@ def test_download_file(
     assert http.last_request().headers["Accept-Encoding"] == "Identity"
 
 
+def test_download_file_recover_from_error(
+    http: type[httpretty], fixture_dir: FixtureDirGetter, tmp_path: Path
+) -> None:
+    file_path = fixture_dir("distributions") / "demo-0.1.0.tar.gz"
+    file_body = file_path.read_bytes()
+    file_length = len(file_body)
+    url = "https://foo.com/demo-0.1.0.tar.gz"
+
+    def handle_request(
+        request: HTTPrettyRequest, uri: str, response_headers: dict[str, Any]
+    ) -> tuple[int, dict[str, Any], bytes]:
+        if request.headers.get("Range") is None:
+            response_headers["Content-Length"] = str(file_length)
+            response_headers["Accept-Ranges"] = "bytes"
+            return 200, response_headers, file_body[: file_length // 2]
+        else:
+            start = int(
+                request.headers.get("Range", "bytes=0-").split("=")[1].split("-")[0]
+            )
+            return 206, response_headers, file_body[start:]
+
+    http.register_uri(http.GET, url, body=handle_request)
+    dest = tmp_path / "demo-0.1.0.tar.gz"
+
+    download_file(url, dest, chunk_size=file_length // 2, max_retries=1)
+
+    expect_sha_256 = "9fa123ad707a5c6c944743bf3e11a0e80d86cb518d3cf25320866ca3ef43e2ad"
+    assert get_file_hash(dest) == expect_sha_256
+    assert http.last_request().headers["Accept-Encoding"] == "Identity"
+    assert http.last_request().headers["Range"] == f"bytes={file_length // 2}-"
+
+
+def test_download_file_fail_when_no_range(
+    http: type[httpretty], fixture_dir: FixtureDirGetter, tmp_path: Path
+) -> None:
+    file_path = fixture_dir("distributions") / "demo-0.1.0.tar.gz"
+    file_body = file_path.read_bytes()
+    file_length = len(file_body)
+    url = "https://foo.com/demo-0.1.0.tar.gz"
+
+    def handle_request(
+        request: HTTPrettyRequest, uri: str, response_headers: dict[str, Any]
+    ) -> tuple[int, dict[str, Any], bytes]:
+        response_headers["Content-Length"] = str(file_length)
+        return 200, response_headers, file_body[: file_length // 2]
+
+    http.register_uri(http.GET, url, body=handle_request)
+    dest = tmp_path / "demo-0.1.0.tar.gz"
+    with pytest.raises(ChunkedEncodingError):
+        download_file(url, dest, chunk_size=file_length // 2, max_retries=1)
+
+
+def test_download_file_fail_when_first_chunk_failed(
+    http: type[httpretty], fixture_dir: FixtureDirGetter, tmp_path: Path
+) -> None:
+    file_path = fixture_dir("distributions") / "demo-0.1.0.tar.gz"
+    file_body = file_path.read_bytes()
+    file_length = len(file_body)
+    url = "https://foo.com/demo-0.1.0.tar.gz"
+
+    def handle_request(
+        request: HTTPrettyRequest, uri: str, response_headers: dict[str, Any]
+    ) -> tuple[int, dict[str, Any], bytes]:
+        response_headers["Content-Length"] = str(file_length)
+        response_headers["Accept-Ranges"] = "bytes"
+        return 200, response_headers, file_body[: file_length // 2]
+
+    http.register_uri(http.GET, url, body=handle_request)
+    dest = tmp_path / "demo-0.1.0.tar.gz"
+    with pytest.raises(ChunkedEncodingError):
+        download_file(url, dest, chunk_size=file_length, max_retries=1)
+
+
 @pytest.mark.parametrize(
     "hash_types,expected",
     [