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zenodo.py
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zenodo.py
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__author__ = "Taavi Päll"
__copyright__ = "Copyright 2019, Taavi Päll"
__email__ = "tapa741@gmail.com"
__license__ = "MIT"
import os
import hashlib
from collections import namedtuple
import requests
from requests.exceptions import HTTPError
from snakemake.remote import (
AbstractRemoteObject,
AbstractRemoteProvider,
AbstractRemoteRetryObject,
)
from snakemake.exceptions import ZenodoFileException, WorkflowError
from snakemake.common import lazy_property
ZenFileInfo = namedtuple("ZenFileInfo", ["checksum", "filesize", "id", "download"])
class RemoteProvider(AbstractRemoteProvider):
def __init__(self, *args, stay_on_remote=False, **kwargs):
super(RemoteProvider, self).__init__(
*args, stay_on_remote=stay_on_remote, **kwargs
)
self._zen = ZENHelper(*args, **kwargs)
def remote_interface(self):
return self._zen
@property
def default_protocol(self):
return "https://"
@property
def available_protocols(self):
return ["https://"]
class RemoteObject(AbstractRemoteRetryObject):
def __init__(
self, *args, keep_local=False, stay_on_remote=False, provider=None, **kwargs
):
super(RemoteObject, self).__init__(
*args,
keep_local=keep_local,
stay_on_remote=stay_on_remote,
provider=provider,
**kwargs
)
if provider:
self._zen = provider.remote_interface()
else:
self._zen = ZENHelper(*args, **kwargs)
# === Implementations of abstract class members ===
def _stats(self):
return self._zen.get_files()[os.path.basename(self.local_file())]
def exists(self):
return os.path.basename(self.local_file()) in self._zen.get_files()
def size(self):
if self.exists():
return self._stats().filesize
else:
return self._iofile.size_local
def mtime(self):
# There is no mtime info provided by Zenodo.
# Hence, the files are always considered to be "ancient".
return 0
def _download(self):
stats = self._stats()
download_url = stats.download
r = self._zen._api_request(download_url)
local_md5 = hashlib.md5()
# Download file.
with open(self.local_file(), "wb") as rf:
for chunk in r.iter_content(chunk_size=1024 * 1024 * 10):
local_md5.update(chunk)
rf.write(chunk)
local_md5 = local_md5.hexdigest()
if local_md5 != stats.checksum:
raise ZenodoFileException(
"File checksums do not match for remote file id: {}".format(stats.id)
)
def _upload(self):
with open(self.local_file(), "rb") as lf:
self._zen._api_request(
self._zen.bucket + "/{}".format(os.path.basename(self.remote_file())),
method="PUT",
data=lf,
)
@property
def list(self):
return [i for i in self._zen.get_files()]
@property
def name(self):
return self.local_file()
class ZENHelper(object):
def __init__(self, *args, **kwargs):
try:
self._access_token = kwargs.pop("access_token")
except KeyError:
raise WorkflowError(
"Zenodo personal access token must be passed in as 'access_token' argument.\n"
"Separate registration and access token is needed for Zenodo sandbox "
"environment at https://sandbox.zenodo.org."
)
if "sandbox" in kwargs:
self._sandbox = kwargs.pop("sandbox")
else:
self._sandbox = False
if self._sandbox:
self._baseurl = "https://sandbox.zenodo.org"
else:
self._baseurl = "https://zenodo.org"
if "deposition" in kwargs:
self.deposition = kwargs.pop("deposition")
self.bucket = self.get_bucket()
else:
# Creating a new deposition, as deposition id was not supplied.
self.deposition, self.bucket = self.create_deposition().values()
def _api_request(
self, url, method="GET", data=None, headers={}, files=None, json=False
):
# Create a session with a hook to raise error on bad request.
session = requests.Session()
session.hooks = {"response": lambda r, *args, **kwargs: r.raise_for_status()}
session.headers["Authorization"] = "Bearer {}".format(self._access_token)
session.headers.update(headers)
# Run query.
try:
r = session.request(method=method, url=url, data=data, files=files)
if json:
msg = r.json()
return msg
else:
return r
except HTTPError as e:
raise WorkflowError("Failed to connect to zenodo", e)
def create_deposition(self):
resp = self._api_request(
method="POST",
url=self._baseurl + "/api/deposit/depositions",
headers={"Content-Type": "application/json"},
data="{}",
json=True,
)
return {"id": resp["id"], "bucket": resp["links"]["bucket"]}
def get_bucket(self):
resp = self._api_request(
self._baseurl + "/api/deposit/depositions/{}".format(self.deposition),
headers={"Content-Type": "application/json"},
json=True,
)
return resp["links"]["bucket"]
def get_files(self):
files = self._api_request(
self._baseurl + "/api/deposit/depositions/{}/files".format(self.deposition),
headers={"Content-Type": "application/json"},
json=True,
)
return {
os.path.basename(f["filename"]): ZenFileInfo(
f["checksum"], int(f["filesize"]), f["id"], f["links"]["download"]
)
for f in files
}