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| import os
import base64
import re
import binascii
import chardet
import asyncio
import contextvars
import hashlib
import hmac
import aiohttp
from datetime import datetime, timezone
import mimetypes
import aiofiles
from . import logger
log = logger.setup_logger(__name__)
OBS_DOMAIN = os.environ['obs_domain']
OBS_BUCKET = os.environ['obs_bucket']
OBS_SECRET_KEY = os.environ['OBS_SECRET_KEY']
OBS_ACCESS_KEY = os.environ['OBS_ACCESS_KEY']
OBS_HOST = f"{OBS_BUCKET}.{OBS_DOMAIN}"
OBS_BASE_URL = f"https://{OBS_HOST}"
FILE_PATH = contextvars.ContextVar("file path")
UPLOAD_TO = contextvars.ContextVar("OBS object", default=None)
MIME_TYPE = contextvars.ContextVar("mime type")
PARTS = contextvars.ContextVar("parts", default=dict())
OBS_SESSION = contextvars.ContextVar("obs session")
MAX_LENGTH = 100 * 1024 * 1024
SEM = asyncio.Semaphore(20)
def get_time() -> str:
now = datetime.now(tz=timezone.utc)
return now.strftime("%a, %d %b %Y %H:%M:%S %Z")
def get_authorization(method, headers, uri) -> str:
canonicalizedheaders = get_canonicalizedheaders(headers)
canonical_list = [
method,
headers.get('Content-MD5', ""),
headers.get('Content-Type', ""),
headers.get('Date', ""),
canonicalizedheaders + f'/{OBS_BUCKET}{uri}'
]
hashed = hmac.new(
OBS_SECRET_KEY.encode('UTF-8'),
"\n".join(canonical_list).encode('UTF-8'),
hashlib.sha1
)
encode_canonical = binascii.b2a_base64(
hashed.digest()
)[:-1].decode('UTF-8')
return f"OBS {OBS_ACCESS_KEY}:{encode_canonical}"
def get_canonicalizedheaders(headers: dict) -> str:
result = ''
for key in sorted(headers):
key = key.lower()
if key.startswith('x-obs-'):
if any(ord(c) > 127 for c in key):
raise Exception("header's key contain non-ascii charactor!")
result += f"{key}:{headers[key]}\n"
return result
async def get_rfc1864_md5(start=0, end=None, byte_str: bytes = None):
hasher = hashlib.md5()
if byte_str:
hasher.update(byte_str)
else:
async for data in file_sender(start, end):
hasher.update(data)
md5_value = hasher.digest()
base64_md5_value = base64.b64encode(md5_value).decode('utf-8')
return base64_md5_value
async def get_encoding(file):
async with aiofiles.open(file, mode='rb') as fd:
data = await fd.read()
return chardet.detect(data)['encoding']
async def get_mimetype():
file_path = FILE_PATH.get()
content_type, _ = mimetypes.guess_type(file_path)
if not content_type:
content_type = 'application/octet-stream'
elif file_path.endswith('.txt'):
charset = await get_encoding(file_path)
content_type = f"{content_type};charset={charset}"
return content_type
async def file_sender(start=0, end=None):
length = 64*1024
async with aiofiles.open(FILE_PATH.get(), 'rb') as f:
if start:
await f.seek(start)
while True:
if end:
tell = await f.tell()
assert tell <= end, "read too much data!"
if end == tell:
break
left = end - tell
if length > left:
length = left
data = await f.read(length)
if not data:
break
yield data
def generate_objectname(upload_to=None):
if not upload_to:
job = os.environ['JOB_NAME']
build = os.environ['BUILD_ID']
file_name = os.path.basename(FILE_PATH.get())
upload_to = f"/{job}/{build}/{file_name}"
return upload_to
async def put(size, start: int = None, end: int = None, params: dict = {}):
uri = UPLOAD_TO.get()
if params:
uri = uri + "?" + "&".join([f"{k}={params[k]}" for k in params])
mime = 'application/octet-stream' if start else MIME_TYPE.get()
headers = {
'Host': OBS_HOST,
'Content-Length': str(size),
'x-obs-acl': 'public-read',
'Date': get_time(),
'Content-Type': mime,
'Content-MD5': await get_rfc1864_md5(start, end)
}
headers['Authorization'] = get_authorization("PUT", headers, uri)
OBS = OBS_SESSION.get()
async with (
SEM,
OBS.put(uri, data=file_sender(start, end), headers=headers) as resp
):
assert resp.status == 200, \
f"upload {uri} failed! error: {await resp.text()}"
if start is not None:
parts = PARTS.get()
parts[params["partNumber"]] = resp.headers['ETag']
PARTS.set(parts)
return f"{OBS_BASE_URL}{UPLOAD_TO.get()}"
async def del_uploads(upload_id):
uri = f"{UPLOAD_TO.get()}?uploadId={upload_id}"
headers = {'Host': OBS_HOST, 'Date': get_time()}
headers['Authorization'] = get_authorization("DELETE", headers, uri)
async with OBS_SESSION.get().delete(uri, headers=headers) as resp:
assert resp.status == 204, \
f"delete uploads {upload_id} failed: {await resp.text()}"
def split_file_yield(size):
step = MAX_LENGTH
for offset in range(0, size, step):
start = offset
left = size - offset
end, length = (offset + step, step) if left > step else (size, left)
yield (start, end, length)
async def init_uploads():
uri = f"{UPLOAD_TO.get()}?uploads"
headers = {
'Host': OBS_HOST,
'Content-Type': MIME_TYPE.get(),
'x-obs-acl': 'public-read',
'Date': get_time()
}
headers['Authorization'] = get_authorization("POST", headers, uri)
async with OBS_SESSION.get().post(uri, headers=headers) as resp:
assert resp.status == 200, \
f"init uploads {uri} failed! error: {await resp.text()}"
result = await resp.text()
return re.search(r'UploadId>([^<\s]+)</UploadId', result).group(1)
async def puts(size, upload_id):
part_number = 1
tasks = set()
async with asyncio.TaskGroup() as tg:
for start, end, length in split_file_yield(size):
params = {"partNumber": part_number, "uploadId": upload_id}
tasks.add(tg.create_task(put(length, start, end, params)))
part_number += 1
async def merge_body() -> bytes:
parts = PARTS.get()
log.debug(parts)
sorted_key = sorted(parts)
part = "<Part><PartNumber>{}</PartNumber><ETag>{}</ETag></Part>"
body = ''.join([part.format(key, parts[key]) for key in sorted_key])
body = f"<CompleteMultipartUpload>{body}</CompleteMultipartUpload>"
log.debug(body)
bs = body.encode()
return bs, await get_rfc1864_md5(byte_str=bs)
async def merge(upload_id):
uri = f"{UPLOAD_TO.get()}?uploadId={upload_id}"
body, md5 = await merge_body()
headers = {
'Host': OBS_HOST,
'Content-Length': str(len(body)),
'Date': get_time(),
'Content-MD5': md5,
'Content-Type': 'application/xml;charset=utf-8',
}
headers['Authorization'] = get_authorization("POST", headers, uri)
OBS = OBS_SESSION.get()
async with OBS.post(uri, headers=headers, data=body) as resp:
assert resp.status in [200, 500, 503], \
f"init uploads {uri} failed! error: {await resp.text()}"
async def chunked_put(size: int) -> str:
upload_id = await init_uploads()
log.info(f"uploadId: {upload_id}")
try:
await puts(size, upload_id)
except Exception:
log.error(f"call 'puts({size}, {upload_id})' failed.")
await del_uploads(upload_id)
raise
log.debug("finish upload all parts of the file")
await merge(upload_id)
log.debug("finish merge all parts of the file")
return f"{OBS_BASE_URL}{UPLOAD_TO.get()}"
async def upload(
session: aiohttp.ClientSession,
file_path: str, *, upload_to: str = None
) -> str:
"""
@session: aiohttp.ClientSession, obs aiohttp client session
@file_path: str, the local file path
@upload_to: str, the remote path to store,
default is: /JOB_NAME/BUILD_ID/basename(file_path)
return the file download url
"""
FILE_PATH.set(file_path)
UPLOAD_TO.set(generate_objectname(upload_to))
MIME_TYPE.set(await get_mimetype())
OBS_SESSION.set(session)
size = os.path.getsize(file_path)
if MAX_LENGTH < size:
url = await chunked_put(size)
else:
url = await asyncio.create_task(put(size))
return url
|