128 lines
4 KiB
Python
128 lines
4 KiB
Python
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import cStringIO as StringIO
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import os
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import boto.s3.connection
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import boto.s3.key
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from . import Storage
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class S3Storage(Storage):
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def __init__(self, storage_path, s3_access_key, s3_secret_key, s3_bucket):
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self._s3_conn = \
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boto.s3.connection.S3Connection(s3_access_key,
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s3_secret_key,
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is_secure=False)
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self._s3_bucket = self._s3_conn.get_bucket(s3_bucket)
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self._root_path = storage_path
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def _debug_key(self, key):
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"""Used for debugging only."""
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orig_meth = key.bucket.connection.make_request
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def new_meth(*args, **kwargs):
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print '#' * 16
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print args
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print kwargs
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print '#' * 16
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return orig_meth(*args, **kwargs)
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key.bucket.connection.make_request = new_meth
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def _init_path(self, path=None):
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path = os.path.join(self._root_path, path) if path else self._root_path
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if path and path[0] == '/':
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return path[1:]
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return path
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def get_content(self, path):
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path = self._init_path(path)
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key = boto.s3.key.Key(self._s3_bucket, path)
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if not key.exists():
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raise IOError('No such key: \'{0}\''.format(path))
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return key.get_contents_as_string()
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def put_content(self, path, content):
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path = self._init_path(path)
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key = boto.s3.key.Key(self._s3_bucket, path)
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key.set_contents_from_string(content)
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return path
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def stream_read(self, path):
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path = self._init_path(path)
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key = boto.s3.key.Key(self._s3_bucket, path)
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if not key.exists():
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raise IOError('No such key: \'{0}\''.format(path))
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while True:
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buf = key.read(self.buffer_size)
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if not buf:
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break
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yield buf
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def stream_write(self, path, fp):
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# Minimum size of upload part size on S3 is 5MB
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buffer_size = 5 * 1024 * 1024
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if self.buffer_size > buffer_size:
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buffer_size = self.buffer_size
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path = self._init_path(path)
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mp = self._s3_bucket.initiate_multipart_upload(path)
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num_part = 1
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while True:
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try:
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buf = fp.read(buffer_size)
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if not buf:
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break
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io = StringIO.StringIO(buf)
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mp.upload_part_from_file(io, num_part)
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num_part += 1
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io.close()
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except IOError:
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break
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mp.complete_upload()
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def list_directory(self, path=None):
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path = self._init_path(path)
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if not path.endswith('/'):
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path += '/'
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ln = 0
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if self._root_path != '/':
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ln = len(self._root_path)
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exists = False
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for key in self._s3_bucket.list(prefix=path, delimiter='/'):
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exists = True
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name = key.name
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if name.endswith('/'):
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yield name[ln:-1]
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else:
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yield name[ln:]
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if exists is False:
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# In order to be compliant with the LocalStorage API. Even though
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# S3 does not have a concept of folders.
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raise OSError('No such directory: \'{0}\''.format(path))
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def exists(self, path):
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path = self._init_path(path)
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key = boto.s3.key.Key(self._s3_bucket, path)
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return key.exists()
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def remove(self, path):
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path = self._init_path(path)
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key = boto.s3.key.Key(self._s3_bucket, path)
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if key.exists():
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# It's a file
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key.delete()
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return
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# We assume it's a directory
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if not path.endswith('/'):
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path += '/'
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for key in self._s3_bucket.list(prefix=path):
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key.delete()
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def get_size(self, path):
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path = self._init_path(path)
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# Lookup does a HEAD HTTP Request on the object
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key = self._s3_bucket.lookup(path)
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if not key:
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raise OSError('No such key: \'{0}\''.format(path))
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return key.size
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