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Copy pathdatafile.py
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348 lines (297 loc) · 11.3 KB
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'Algorithmia Data API Client (python)'
import re
import json
import six
import tempfile
from datetime import datetime
import os.path
import pkgutil
import zipfile
from Algorithmia.util import getParentAndBase
from Algorithmia.data import DataObject, DataObjectType
from Algorithmia.errors import DataApiError, raiseDataApiError
from io import RawIOBase
class DataFile(DataObject):
def __init__(self, client, dataUrl):
super(DataFile, self).__init__(DataObjectType.file)
self.client = client
# Parse dataUrl
self.path = re.sub(r'^data://|^/', '', dataUrl)
self.url = '/v1/data/' + self.path
self.last_modified = None
self.size = None
def set_attributes(self, attributes):
self.last_modified = datetime.strptime(attributes['last_modified'], '%Y-%m-%dT%H:%M:%S.%fZ')
self.size = attributes['size']
# Deprecated:
def get(self):
return self.client.getHelper(self.url)
# Get file from the data api
def getFile(self, as_path=False):
exists, error = self.existsWithError()
if not exists:
raise DataApiError('unable to get file {} - {}'.format(self.path, error))
# Make HTTP get request
response = self.client.getHelper(self.url)
with tempfile.NamedTemporaryFile(delete=False) as f:
for block in response.iter_content(1024):
if not block:
break
f.write(block)
f.flush()
if as_path:
return f.name
else:
return open(f.name)
def getAsZip(self):
"""Download/decompress file/directory and return path to file/directory.
Expects the `DataFile` object to contain a data API path pointing to a file/directory compressed with a zip-based compression algorithm.
Either returns the directory or a path to the file, depending on whether a directory or file was zipped.
"""
local_file_path = self.getFile(as_path=True)
directory_path = tempfile.mkdtemp()
with zipfile.ZipFile(local_file_path, 'r') as ziph:
ziph.extractall(directory_path)
if len(ziph.namelist()) > 1:
output_path = directory_path
else:
filename = ziph.namelist()[0]
output_path = os.path.join(directory_path, filename)
return output_path
def getName(self):
_, name = getParentAndBase(self.path)
return name
def getBytes(self):
exists, error = self.existsWithError()
if not exists:
raise DataApiError('unable to get file {} - {}'.format(self.path, error))
# Make HTTP get request
return self.client.getHelper(self.url).content
def getString(self):
exists, error = self.existsWithError()
if not exists:
raise DataApiError('unable to get file {} - {}'.format(self.path, error))
# Make HTTP get request
return self.client.getHelper(self.url).text
def getJson(self):
exists, error = self.existsWithError()
if not exists:
raise DataApiError('unable to get file {} - {}'.format(self.path, error))
# Make HTTP get request
return self.client.getHelper(self.url).json()
def getNumpy(self):
exists, error = self.existsWithError()
if not exists:
raise DataApiError('unable to get file {} - {}'.format(self.path, error))
np_loader = pkgutil.find_loader('numpy')
if np_loader is not None:
import numpy as np
payload = self.client.getHelper(self.url).json()
return np.array(payload)
else:
raise DataApiError("Attempted to .getNumpy() file without numpy available, please install numpy.")
def exists(self):
# In order to not break backward compatability keeping this method to only return
# a boolean
exists, error = self.existsWithError()
return exists
def existsWithError(self):
response = self.client.headHelper(self.url)
if 'X-Error-Message' in response.headers:
error = response.headers['X-Error-Message']
else:
error = response.text
return (response.status_code == 200, error)
def put(self, data):
# Post to data api
# First turn the data to bytes if we can
if isinstance(data, six.string_types) and not isinstance(data, six.binary_type):
data = bytes(data.encode())
if isinstance(data, six.binary_type):
result = self.client.putHelper(self.url, data)
if 'error' in result:
raise raiseDataApiError(result)
else:
return self
else:
raise TypeError("Must put strings or binary data. Use putJson instead")
def putJson(self, data):
# Post to data api
jsonElement = json.dumps(data)
result = self.client.putHelper(self.url, jsonElement)
if 'error' in result:
raise raiseDataApiError(result)
else:
return self
def putFile(self, path):
# Post file to data api
with open(path, 'rb') as f:
result = self.client.putHelper(self.url, f)
if 'error' in result:
raise raiseDataApiError(result)
else:
return self
def putNumpy(self, array):
# Post numpy array as json payload
np_loader = pkgutil.find_loader('numpy')
if np_loader is not None:
import numpy as np
encoded_array = array.tolist()
self.putJson(encoded_array)
return self
else:
raise DataApiError("Attempted to .putNumpy() a file without numpy available, please install numpy.")
def putAsZip(self, path):
"""Zip file/directory and upload to data API location defined by `DataFile` object.
Accepts either a single file or a directory containing other files and directories.
"""
temp = tempfile.NamedTemporaryFile(delete=False).name
if os.path.isdir(path):
with zipfile.ZipFile(temp, 'w') as ziph:
for root, dirs, files in os.walk(path):
for file in files:
f_path = os.path.join(root, file)
arc_path = os.path.relpath(os.path.join(root, file), path)
ziph.write(f_path, arc_path)
else:
with zipfile.ZipFile(temp, 'w') as ziph:
ziph.write(path)
return self.putFile(temp)
def delete(self):
# Delete from data api
result = self.client.deleteHelper(self.url)
if 'error' in result:
raise raiseDataApiError(result)
else:
return True
class LocalDataFile():
def __init__(self, client, filePath):
self.client = client
# Parse dataUrl
self.path = filePath.replace('file://', '')
self.url = '/v1/data/' + self.path
self.last_modified = None
self.size = None
def set_attributes(self, attributes):
self.last_modified = datetime.strptime(attributes['last_modified'], '%Y-%m-%dT%H:%M:%S.%fZ')
self.size = attributes['size']
# Get file from the data api
def getFile(self):
exists, error = self.existsWithError()
if not exists:
raise DataApiError('unable to get file {} - {}'.format(self.path, error))
return open(self.path)
def getName(self):
_, name = getParentAndBase(self.path)
return name
def getBytes(self):
exists, error = self.existsWithError()
if not exists:
raise DataApiError('unable to get file {} - {}'.format(self.path, error))
f = open(self.path, 'rb')
bts = f.read()
f.close()
return bts
def getString(self):
exists, error = self.existsWithError()
if not exists:
raise DataApiError('unable to get file {} - {}'.format(self.path, error))
with open(self.path, 'r') as f: return f.read()
def getJson(self):
exists, error = self.existsWithError()
if not exists:
raise DataApiError('unable to get file {} - {}'.format(self.path, error))
return json.loads(open(self.path, 'r').read())
def exists(self):
return self.existsWithError()[0]
def existsWithError(self):
return os.path.isfile(self.path), ''
def put(self, data):
# First turn the data to bytes if we can
if isinstance(data, six.string_types) and not isinstance(data, six.binary_type):
data = bytes(data.encode())
with open(self.path, 'wb') as f: f.write(data)
return self
def putJson(self, data):
# Post to data api
jsonElement = json.dumps(data)
result = localPutHelper(self.path, jsonElement)
if 'error' in result:
raise raiseDataApiError(result)
else:
return self
def putFile(self, path):
result = localPutHelper(path, self.path)
if 'error' in result:
raise raiseDataApiError(result)
else:
return self
def delete(self):
try:
os.remove(self.path)
return True
except:
raise DataApiError('Failed to delete local file ' + self.path)
def localPutHelper(path, contents):
try:
with open(path, 'wb') as f:
f.write(contents)
return dict(status='success')
except Exception as e:
return dict(error=str(e))
class AdvancedDataFile(DataFile, RawIOBase):
def __init__(self, client, dataUrl, cleanup=True):
super(AdvancedDataFile, self).__init__(client, dataUrl)
self.cleanup = cleanup
self.local_file = None
def __del__(self):
if self.local_file:
filepath = self.local_file.name
self.local_file.close()
if self.cleanup:
os.remove(filepath)
def readable(self):
return True
def seekable(self):
return True
def writable(self):
return False
def read(self, __size=None):
if not self.local_file:
self.local_file = self.getFile()
output = self.local_file.read()
elif __size:
output = self.local_file.read(__size)
else:
output = self.local_file.read()
return output
def readline(self, __size=None):
if not self.local_file:
self.local_file = self.getFile()
with self.local_file as f:
if __size:
output = f.readline(__size)
else:
output = f.readline()
return output
def readlines(self, __hint=None):
if not self.local_file:
self.local_file = self.getFile()
if __hint:
output = self.local_file.readlines(__hint)
else:
output = self.local_file.readlines()
return output
def tell(self):
if not self.local_file:
self.local_file = self.getFile()
output = self.local_file.tell()
return output
def seek(self, __offset, __whence=None):
if not self.local_file:
self.local_file = self.getFile()
if __whence:
output = self.local_file.seek(__offset, __whence)
else:
output = self.local_file.seek(__offset)
return output
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