feat(api): Added functions for fetching the connector version feeds. (#435)

* Added connector feed utility functions

* Check ex code

src/specklepy/core/api/connector_versions.py

@@ -0,0 +1,70 @@
+from datetime import datetime
+from typing import List
+
+import httpx
+from pydantic import AliasGenerator, BaseModel, ConfigDict, HttpUrl
+from pydantic.alias_generators import to_pascal
+
+
+class ConnectorFeedBaseModel(BaseModel):
+    """
+    Parent class for all Connector Feed Object Model classes
+    Sets-up a pydantic config to serialize properties using a pascal case alias
+    """
+
+    model_config = ConfigDict(
+        alias_generator=AliasGenerator(
+            validation_alias=to_pascal,
+        ),
+        populate_by_name=True,
+    )
+
+
+class ConnectorVersion(ConnectorFeedBaseModel):
+    number: str
+    url: HttpUrl
+    os: int  # this is an enum, it's properly defined in the old v2 SDK (used by Speckle.Manager.Feed)  # noqa: E501
+    architecture: int  # These are enums, they are properly defined in the old v2 SDK (used by Speckle.Manager.Feed) # noqa: E501
+    date: datetime
+    prerelease: bool
+
+
+class ConnectorVersions(ConnectorFeedBaseModel):
+    versions: List[ConnectorVersion]
+
+
+def get_latest_version(host_app_slug: str, allow_pre_release: bool) -> ConnectorVersion:
+    """
+    Fetches the JSON feed for the given connector slug and
+    Returns the latest version by date - Note, it does not consider semvers!
+
+    Arguments:
+        host_app_slug {str} -- the host app slug to query for
+        allow_pre_release {bool} -- if false, only stable releases will be considered
+    Raises:
+        HTTPStatusError: if http request failed
+        ValidationError: response was not valid json
+        ValueError: The feed contained no connector versions
+    """
+    connector_versions = get_connector_versions(host_app_slug).versions
+    filtered_versions = [
+        v for v in connector_versions if allow_pre_release or not v.prerelease
+    ]
+
+    return max(filtered_versions, key=lambda x: x.date)
+
+
+def get_connector_versions(host_app_slug: str) -> ConnectorVersions:
+    """
+    Fetches the JSON feed for the given slug (v3 feeds only)
+    Raises:
+        HTTPStatusError: if http request failed
+        ValidationError: response was not valid json
+    """
+    url = f"https://releases.speckle.dev/manager2/feeds/{host_app_slug.lower()}-v3.json"
+
+    res = httpx.get(url).raise_for_status()
+
+    feed_data = ConnectorVersions.model_validate_json(res.text)
+
+    return feed_data

tests/integration/test_connector_versions.py

@@ -0,0 +1,32 @@
+import pytest
+from httpx import HTTPStatusError
+
+from specklepy.core.api.connector_versions import (
+    ConnectorVersion,
+    ConnectorVersions,
+    get_connector_versions,
+    get_latest_version,
+)
+
+# NOTE: the tests in this file are testing against the live releases.speckle.dev server
+# url defined in get_connector_versions.
+
+
+def test_connector_versions():
+    res = get_connector_versions("blender")
+
+    assert isinstance(res, ConnectorVersions)
+    assert res.versions  # Assuming the feed is not empty
+
+
+def test_get_latest_version_throws_no_slug():
+    with pytest.raises(HTTPStatusError) as ex:
+        get_latest_version("non-existent-connector!", True)
+
+    assert "404" in str(ex.value)
+
+
+def test_get_latest_version():
+    res = get_latest_version("blender", False)
+
+    assert isinstance(res, ConnectorVersion)