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import json
import os
import requests
import socket
from typing import Optional, Dict, Union, Tuple, List
from urllib.parse import urlsplit
from langchainhub import _types
def _is_localhost(url: str) -> bool:
"""Check if the URL is localhost.
Parameters
----------
url : str
The URL to check.
Returns
-------
bool
True if the URL is localhost, False otherwise.
"""
try:
netloc = urlsplit(url).netloc.split(":")[0]
ip = socket.gethostbyname(netloc)
return ip == "127.0.0.1" or ip.startswith("0.0.0.0") or ip.startswith("::")
except socket.gaierror:
return False
def _get_api_key(api_key: Optional[str]) -> Optional[str]:
api_key = api_key or os.getenv("LANGCHAIN_HUB_API_KEY")
api_key = api_key or os.getenv("LANGCHAIN_API_KEY")
if api_key is None or not api_key.strip():
return None
return api_key.strip().strip('"').strip("'") or None
def _get_api_url(api_url: Optional[str], has_api_key: bool = False) -> str:
default_api_url = "https://api.hub.langchain.com"
_api_url = (
api_url
if api_url is not None
else os.getenv(
"LANGCHAIN_HUB_API_URL",
default_api_url,
)
)
if not _api_url.strip():
raise ValueError("LangChain Hub API URL cannot be empty")
return _api_url.strip().strip('"').strip("'").rstrip("/")
def parse_owner_repo_commit(identifier: str) -> Tuple[str, str, Optional[str]]:
"""
Parses a string in the format of `owner/repo:commit` and returns a tuple of
(owner, repo, commit).
"""
owner_repo = identifier
commit = None
if ":" in identifier:
owner_repo, commit = identifier.split(":", 1)
if "/" not in owner_repo:
raise ValueError(
f"Invalid identifier {identifier}. "
"Identifier must be in the format of `owner/repo:commit or owner/repo`."
)
owner, repo = owner_repo.split("/", 1)
return owner, repo, commit
class Client:
"""
An API Client for LangChainHub
"""
def __init__(self, api_url: Optional[str] = None, *, api_key: Optional[str] = None):
self.api_key = _get_api_key(api_key)
self.api_url = _get_api_url(api_url, self.api_key is not None)
def _get_headers(self):
headers = {}
if self.api_key is not None:
headers["x-api-key"] = self.api_key
return headers
@property
def _host_url(self) -> str:
"""The web host url."""
if _is_localhost(self.api_url):
link = "http://localhost"
elif "beta" in self.api_url.split(".", maxsplit=1)[0]:
link = "https://beta.smith.langchain.com"
elif "dev" in self.api_url.split(".", maxsplit=1)[0]:
link = "https://dev.smith.langchain.com"
else:
link = "https://smith.langchain.com"
return link
def get_settings(self):
res = requests.get(
f"{self.api_url}/settings",
headers=self._get_headers(),
)
res.raise_for_status()
return res.json()
def set_tenant_handle(self, tenant_handle: str):
res = requests.post(
f"{self.api_url}/settings/handle",
headers=self._get_headers(),
json={"tenant_handle": tenant_handle},
)
res.raise_for_status()
return res.json()
def list_repos(self, limit: int = 100, offset: int = 0):
res = requests.get(
f"{self.api_url}/repos?limit={limit}&offset={offset}",
headers=self._get_headers(),
)
res.raise_for_status()
return res.json()
def get_repo(self, repo_full_name: str):
res = requests.get(
f"{self.api_url}/repos/{repo_full_name}",
headers=self._get_headers(),
)
res.raise_for_status()
return res.json()
def create_repo(
self, repo_handle: str, *, description: str = "", is_public: bool = True
):
json = {
"repo_handle": repo_handle,
"is_public": is_public,
"description": description,
}
res = requests.post(
f"{self.api_url}/repos/",
headers=self._get_headers(),
json=json,
)
res.raise_for_status()
return res.json()
def list_commits(self, repo_full_name: str, limit: int = 100, offset: int = 0):
res = requests.get(
f"{self.api_url}/commits/{repo_full_name}/?limit={limit}&offset={offset}",
headers=self._get_headers(),
)
res.raise_for_status()
return res.json()
def like_repo(self, repo_full_name: str):
res = requests.post(
f"{self.api_url}/likes/{repo_full_name}",
headers=self._get_headers(),
json={"like": True},
)
res.raise_for_status()
return res.json()
def unlike_repo(self, repo_full_name: str):
res = requests.post(
f"{self.api_url}/likes/{repo_full_name}",
headers=self._get_headers(),
json={"like": False},
)
res.raise_for_status()
return res.json()
def _get_latest_commit_hash(self, repo_full_name: str) -> Optional[str]:
commits_resp = self.list_commits(repo_full_name)
commits = commits_resp["commits"]
if len(commits) == 0:
return None
return commits[0]["commit_hash"]
def update_repo(
self,
repo_full_name: str,
*,
description: Optional[str] = None,
is_public: Optional[bool] = None,
tags: Optional[List[str]] = None,
):
json: Dict[str, Union[str, bool, List[str]]] = {}
if description is not None:
json["description"] = description
if is_public is not None:
json["is_public"] = is_public
if tags is not None:
json["tags"] = tags
res = requests.patch(
f"{self.api_url}/repos/{repo_full_name}",
headers=self._get_headers(),
json=json,
)
res.raise_for_status()
return res.json()
def push(
self,
repo_full_name: str,
manifest_json: str,
*,
parent_commit_hash: Optional[str] = "latest",
new_repo_is_public: bool = False,
new_repo_description: str = "",
):
# make sure repo exists
try:
repo = self.get_repo(repo_full_name)
except requests.exceptions.HTTPError as e:
if e.response.status_code != 404:
raise e
# create repo if it doesn't exist
owner, repo, _ = parse_owner_repo_commit(repo_full_name)
# make sure I am owner
res = self.get_settings()
if res["tenant_handle"] != owner:
raise ValueError(
f"Tenant {res['tenant_handle']} is not the owner of repo {repo_full_name}"
)
self.create_repo(
repo, is_public=new_repo_is_public, description=new_repo_description
)
manifest_dict = json.loads(manifest_json)
if parent_commit_hash == "latest":
parent_commit_hash = self._get_latest_commit_hash(repo_full_name)
request_dict = {"parent_commit": parent_commit_hash, "manifest": manifest_dict}
res = requests.post(
f"{self.api_url}/commits/{repo_full_name}",
headers=self._get_headers(),
json=request_dict,
)
res.raise_for_status()
res = res.json()
commit_hash = res["commit"]["commit_hash"]
short_hash = commit_hash[:8]
url = self._host_url + f"/hub/{repo_full_name}/{short_hash}"
return url
def pull_repo(self, owner_repo_commit: str) -> _types.Repo:
owner, repo, commit_hash = parse_owner_repo_commit(owner_repo_commit)
if commit_hash is None or commit_hash == "latest":
commit_hash = self._get_latest_commit_hash(f"{owner}/{repo}")
if commit_hash is None:
raise ValueError("No commits found")
res = requests.get(
f"{self.api_url}/commits/{owner}/{repo}/{commit_hash}",
headers=self._get_headers(),
)
res.raise_for_status()
result = res.json()
return {"owner": owner, "repo": repo, **result}
def pull(self, owner_repo_commit: str):
res_dict = self.pull_repo(owner_repo_commit)
return json.dumps(res_dict["manifest"])
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