"""Amazon S3 storage backend. Uses a URL of the form s3://BUCKET/PATH/."""
+from __future__ import division, print_function, unicode_literals
+
import os, sys, tempfile
import boto
+from boto.exception import S3ResponseError
from boto.s3.bucket import Bucket
from boto.s3.key import Key
import cumulus.store
-class S3Store(cumulus.store.Store):
- def __init__(self, url, **kw):
- # Old versions of the Python urlparse library will take a URL like
- # s3://bucket/path/ and include the bucket with the path, while new
- # versions (2.6 and later) treat it as the netloc (which seems more
- # correct).
- #
- # But, so that we can work with either behavior, for now just combine
- # the netloc and path together before we do any further processing
- # (which will then split the combined path apart into a bucket and path
- # again). If we didn't want to support Python 2.5, this would be
- # easier as we could just use the netloc as the bucket directly.
- path = self.netloc + '/' + self.path
- (bucket, prefix) = path.lstrip("/").split("/", 1)
+def throw_notfound(method):
+ """Decorator to convert a 404 error into a cumulus.store.NoutFoundError."""
+ def f(*args, **kwargs):
+ try:
+ return method(*args, **kwargs)
+ except S3ResponseError as e:
+ if e.status == 404:
+ raise cumulus.store.NotFoundError(e)
+ else:
+ raise
+ return f
+
+class Store(cumulus.store.Store):
+ def __init__(self, url):
+ super(Store, self).__init__(url)
self.conn = boto.connect_s3(is_secure=False)
- self.bucket = self.conn.create_bucket(bucket)
- self.prefix = prefix.strip("/")
+ self.bucket = self.conn.create_bucket(url.hostname)
+ self.prefix = url.path
+ if not self.prefix.endswith("/"):
+ self.prefix += "/"
+ self.prefix = self.prefix.lstrip("/")
self.scan_cache = {}
- def _get_key(self, type, name):
+ def _fullpath(self, path, is_directory=False):
+ fullpath = self.prefix + path
+ if is_directory and not fullpath.endswith("/"):
+ fullpath += "/"
+ return fullpath
+
+ def _get_key(self, path):
k = Key(self.bucket)
- k.key = "%s/%s/%s" % (self.prefix, type, name)
+ k.key = self._fullpath(path)
return k
- def scan(self):
- prefix = "%s/" % (self.prefix,)
+ @throw_notfound
+ def scan(self, path):
+ prefix = self._fullpath(path, is_directory=True)
for i in self.bucket.list(prefix):
assert i.key.startswith(prefix)
self.scan_cache[i.key] = i
- def list(self, type):
- prefix = "%s/%s/" % (self.prefix, type)
+ @throw_notfound
+ def list(self, path):
+ prefix = self._fullpath(path, is_directory=True)
+ # TODO: Should use a delimiter
for i in self.bucket.list(prefix):
assert i.key.startswith(prefix)
yield i.key[len(prefix):]
- def get(self, type, name):
+ @throw_notfound
+ def get(self, path):
fp = tempfile.TemporaryFile()
- k = self._get_key(type, name)
+ k = self._get_key(path)
k.get_file(fp)
fp.seek(0)
return fp
- def put(self, type, name, fp):
- k = self._get_key(type, name)
+ @throw_notfound
+ def put(self, path, fp):
+ k = self._get_key(path)
k.set_contents_from_file(fp)
- def delete(self, type, name):
- self.bucket.delete_key("%s/%s/%s" % (self.prefix, type, name))
+ @throw_notfound
+ def delete(self, path):
+ self.bucket.delete_key(self._fullpath(path))
- def stat(self, type, name):
- path = "%s/%s/%s" % (self.prefix, type, name)
+ def stat(self, path):
+ path = self._fullpath(path)
if path in self.scan_cache:
k = self.scan_cache[path]
else:
raise cumulus.store.NotFoundError
return {'size': int(k.size)}
-
-Store = S3Store