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#!/usr/bin/env python2.7
from __future__ import absolute_import, unicode_literals, print_function, division
from sys import argv
from os import environ, stat, remove as _delete_file
from os.path import isfile, dirname, basename, abspath
from hashlib import sha256
from subprocess import check_call as run
from boto.s3.connection import S3Connection
from boto.s3.key import Key
from boto.exception import S3ResponseError
NEED_TO_UPLOAD_MARKER = '.need-to-upload'
BYTES_PER_MB = 1024 * 1024
try:
BUCKET_NAME = environ['TWBS_S3_BUCKET']
except KeyError:
raise SystemExit("TWBS_S3_BUCKET environment variable not set!")
def _sha256_of_file(filename):
hasher = sha256()
with open(filename, 'rb') as input_file:
hasher.update(input_file.read())
file_hash = hasher.hexdigest()
print('sha256({}) = {}'.format(filename, file_hash))
return file_hash
def _delete_file_quietly(filename):
try:
_delete_file(filename)
except (OSError, IOError):
pass
def _tarball_size(directory):
kib = stat(_tarball_filename_for(directory)).st_size // BYTES_PER_MB
return "{} MiB".format(kib)
def _tarball_filename_for(directory):
return abspath('./{}.tar.gz'.format(basename(directory)))
def _create_tarball(directory):
print("Creating tarball of {}...".format(directory))
run(['tar', '-czf', _tarball_filename_for(directory), '-C', dirname(directory), basename(directory)])
def _extract_tarball(directory):
print("Extracting tarball of {}...".format(directory))
run(['tar', '-xzf', _tarball_filename_for(directory), '-C', dirname(directory)])
def download(directory):
_delete_file_quietly(NEED_TO_UPLOAD_MARKER)
try:
print("Downloading {} tarball from S3...".format(friendly_name))
key.get_contents_to_filename(_tarball_filename_for(directory))
except S3ResponseError as err:
open(NEED_TO_UPLOAD_MARKER, 'a').close()
print(err)
raise SystemExit("Cached {} download failed!".format(friendly_name))
print("Downloaded {}.".format(_tarball_size(directory)))
_extract_tarball(directory)
print("{} successfully installed from cache.".format(friendly_name))
def upload(directory):
_create_tarball(directory)
print("Uploading {} tarball to S3... ({})".format(friendly_name, _tarball_size(directory)))
key.set_contents_from_filename(_tarball_filename_for(directory))
print("{} cache successfully updated.".format(friendly_name))
_delete_file_quietly(NEED_TO_UPLOAD_MARKER)
if __name__ == '__main__':
# Uses environment variables:
# AWS_ACCESS_KEY_ID -- AWS Access Key ID
# AWS_SECRET_ACCESS_KEY -- AWS Secret Access Key
argv.pop(0)
if len(argv) != 4:
raise SystemExit("USAGE: s3_cache.py <download | upload> <friendly name> <dependencies file> <directory>")
mode, friendly_name, dependencies_file, directory = argv
conn = S3Connection()
bucket = conn.lookup(BUCKET_NAME)
if bucket is None:
raise SystemExit("Could not access bucket!")
dependencies_file_hash = _sha256_of_file(dependencies_file)
key = Key(bucket, dependencies_file_hash)
key.storage_class = 'REDUCED_REDUNDANCY'
if mode == 'download':
download(directory)
elif mode == 'upload':
if isfile(NEED_TO_UPLOAD_MARKER): # FIXME
upload(directory)
else:
print("No need to upload anything.")
else:
raise SystemExit("Unrecognized mode {!r}".format(mode))
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