README.rst

Snowflake Python Ingest Service SDK

The Snowflake Ingest Service SDK allows users to ingest files into their Snowflake data warehouse in a programmatic fashion via key-pair authentication.

Prerequisites

Python 3.4+

The Snowflake Ingest SDK requires Python 3.4 or above. Backwards compatibility with older versions of Python 3 or any versions of Python 2 is not planned at this time.

A 2048-bit RSA key pair

Snowflake Authentication for the Ingest Service requires creating a 2048 bit RSA key pair and, registering the public key with Snowflake. For detailed instructions, please visit the relevant Snowflake Documentation Page.

Furl, PyJWT, Requests, and Cryptography

Internally, the Snowflake Ingest SDK makes use of Furl, PyJWT, and Requests. In addition, the cryptography is used with PyJWT to sign JWT tokens.

Installation

If you would like to use this sdk, you can install it using python setuptools.

pip install snowflake-ingest

Usage

Here is a simple "hello world" example for using ingest sdk.

from logging import getLogger
from snowflake.ingest import SimpleIngestManager
from snowflake.ingest import StagedFile
from snowflake.ingest.utils.uris import DEFAULT_SCHEME
from datetime import timedelta
from requests import HTTPError
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.serialization import load_pem_private_key
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.serialization import Encoding
from cryptography.hazmat.primitives.serialization import PrivateFormat
from cryptography.hazmat.primitives.serialization import NoEncryption
import time
import datetime
import os
import logging

logging.basicConfig(
        filename='/tmp/ingest.log',
        level=logging.DEBUG)
logger = getLogger(__name__)


with open("./rsa_key.p8", 'rb') as pem_in:
  pemlines = pem_in.read()
  private_key_obj = load_pem_private_key(pemlines,
  os.environ['PRIVATE_KEY_PASSPHRASE'].encode(),
  default_backend())

private_key_text = private_key_obj.private_bytes(
  Encoding.PEM, PrivateFormat.PKCS8, NoEncryption()).decode('utf-8')
# Assume the public key has been registered in Snowflake:
# private key in PEM format

# List of files in the stage specified in the pipe definition
file_list=['a.csv']
ingest_manager = SimpleIngestManager(account='testaccount',
                                         host='testaccount.snowflakecomputing.com',
                                         user='ingest_user',
                                         pipe='TESTDB.TESTSCHEMA.TESTPIPE',
                                         private_key=private_key_text)
# List of files, but wrapped into a class
staged_file_list = []

for file_name in file_list:
    staged_file_list.append(StagedFile(file_name, None))

try:
    resp = ingest_manager.ingest_files(staged_file_list)
except HTTPError as e:
    # HTTP error, may need to retry
    logger.error(e)
    exit(1)

# This means Snowflake has received file and will start loading
assert(resp['responseCode'] == 'SUCCESS')

# Needs to wait for a while to get result in history
while True:
    history_resp = ingest_manager.get_history()

    if len(history_resp['files']) > 0:
        print('Ingest Report:\n')
        print(history_resp)
        break
    else:
        # wait for 20 seconds
        time.sleep(20)

    hour = timedelta(hours=1)
    date = datetime.datetime.utcnow() - hour
    history_range_resp = ingest_manager.get_history_range(date.isoformat() + 'Z')

    print('\nHistory scan report: \n')
    print(history_range_resp)