From: Brian Warner Date: Wed, 13 Feb 2008 02:01:03 +0000 (-0700) Subject: download status: refactor into a separate object, so we don't need to keep the Downlo... X-Git-Tag: allmydata-tahoe-0.8.0~85 X-Git-Url: https://git.rkrishnan.org/Site/Content/Exhibitors/nxhtml.html?a=commitdiff_plain;h=9795bcd9b752bb86bd073357cce002762ceeaf48;p=tahoe-lafs%2Ftahoe-lafs.git download status: refactor into a separate object, so we don't need to keep the Download itself around for a long time --- diff --git a/src/allmydata/download.py b/src/allmydata/download.py index 5229e6a6..aa54f0f1 100644 --- a/src/allmydata/download.py +++ b/src/allmydata/download.py @@ -29,7 +29,8 @@ class DownloadStopped(Exception): pass class Output: - def __init__(self, downloadable, key, total_length, log_parent): + def __init__(self, downloadable, key, total_length, log_parent, + download_status): self.downloadable = downloadable self._decryptor = AES(key) self._crypttext_hasher = hashutil.crypttext_hasher() @@ -41,9 +42,8 @@ class Output: self._crypttext_hash_tree = None self._opened = False self._log_parent = log_parent - - def get_progress(self): - return float(self.length) / self.total_length + self._status = download_status + self._status.set_progress(0.0) def log(self, *args, **kwargs): if "parent" not in kwargs: @@ -58,6 +58,7 @@ class Output: def write_segment(self, crypttext): self.length += len(crypttext) + self._status.set_progress( float(self.length) / self.total_length ) # memory footprint: 'crypttext' is the only segment_size usage # outstanding. While we decrypt it into 'plaintext', we hit @@ -324,10 +325,55 @@ class SegmentDownloader: def bucket_failed(self, vbucket): self.parent.bucket_failed(vbucket) +class DownloadStatus: + implements(IDownloadStatus) + + def __init__(self): + self.storage_index = None + self.size = None + self.helper = False + self.status = "Not started" + self.progress = 0.0 + self.paused = False + self.stopped = False + + def get_storage_index(self): + return self.storage_index + def get_size(self): + return self.size + def using_helper(self): + return self.helper + def get_status(self): + status = self.status + if self.paused: + status += " (output paused)" + if self.stopped: + status += " (output stopped)" + return status + def get_progress(self): + return self.progress + + def set_storage_index(self, si): + self.storage_index = si + def set_size(self, size): + self.size = size + def set_helper(self, helper): + self.helper = helper + def set_status(self, status): + self.status = status + def set_paused(self, paused): + self.paused = paused + def set_stopped(self, stopped): + self.stopped = stopped + def set_progress(self, value): + self.progress = value + + class FileDownloader: - implements(IPushProducer, IDownloadStatus) + implements(IPushProducer) check_crypttext_hash = True check_plaintext_hash = True + _status = None def __init__(self, client, u, downloadable): self._client = client @@ -341,12 +387,14 @@ class FileDownloader: self.init_logging() - self._status = "Starting" + self._status = s = DownloadStatus() + s.set_status("Starting") if IConsumer.providedBy(downloadable): downloadable.registerProducer(self, True) self._downloadable = downloadable - self._output = Output(downloadable, u.key, self._size, self._log_number) + self._output = Output(downloadable, u.key, self._size, self._log_number, + self._status) self._paused = False self._stopped = False @@ -381,16 +429,22 @@ class FileDownloader: if self._paused: return self._paused = defer.Deferred() + if self._status: + self._status.set_paused(True) def resumeProducing(self): if self._paused: p = self._paused self._paused = None eventually(p.callback, None) + if self._status: + self._status.set_paused(False) def stopProducing(self): self.log("Download.stopProducing") self._stopped = True + if self._status: + self._status.set_stopped(True) def start(self): self.log("starting download") @@ -406,13 +460,15 @@ class FileDownloader: # once we know that, we can download blocks from everybody d.addCallback(self._download_all_segments) def _finished(res): - self._status = "Finished" + if self._status: + self._status.set_status("Finished") if IConsumer.providedBy(self._downloadable): self._downloadable.unregisterProducer() return res d.addBoth(_finished) def _failed(why): - self._status = "Failed" + if self._status: + self._status.set_status("Failed") self._output.fail(why) return why d.addErrback(_failed) @@ -428,14 +484,18 @@ class FileDownloader: dl.append(d) self._responses_received = 0 self._queries_sent = len(dl) - self._status = "Locating Shares (%d/%d)" % (self._responses_received, - self._queries_sent) + if self._status: + self._status.set_status("Locating Shares (%d/%d)" % + (self._responses_received, + self._queries_sent)) return defer.DeferredList(dl) def _got_response(self, buckets): self._responses_received += 1 - self._status = "Locating Shares (%d/%d)" % (self._responses_received, - self._queries_sent) + if self._status: + self._status.set_status("Locating Shares (%d/%d)" % + (self._responses_received, + self._queries_sent)) for sharenum, bucket in buckets.iteritems(): b = storage.ReadBucketProxy(bucket) self.add_share_bucket(sharenum, b) @@ -477,7 +537,8 @@ class FileDownloader: # all are supposed to be identical. We compute the hash of the data # that comes back, and compare it against the version in our URI. If # they don't match, ignore their data and try someone else. - self._status = "Obtaining URI Extension" + if self._status: + self._status.set_status("Obtaining URI Extension") def _validate(proposal, bucket): h = hashutil.uri_extension_hash(proposal) @@ -537,7 +598,8 @@ class FileDownloader: self._share_hashtree.set_hashes({0: self._roothash}) def _get_hashtrees(self, res): - self._status = "Retrieving Hash Trees" + if self._status: + self._status.set_status("Retrieving Hash Trees") d = self._get_plaintext_hashtrees() d.addCallback(self._get_crypttext_hashtrees) d.addCallback(self._setup_hashtrees) @@ -653,8 +715,9 @@ class FileDownloader: return res def _download_segment(self, res, segnum): - self._status = "Downloading segment %d of %d" % (segnum, - self._total_segments) + if self._status: + self._status.set_status("Downloading segment %d of %d" % + (segnum, self._total_segments)) self.log("downloading seg#%d of %d (%d%%)" % (segnum, self._total_segments, 100.0 * segnum / self._total_segments)) @@ -730,21 +793,9 @@ class FileDownloader: got=self._output.length, expected=self._size) return self._output.finish() - def get_storage_index(self): - return self._storage_index - def get_size(self): - return self._size - def using_helper(self): - return False - def get_status(self): - status = self._status - if self._paused: - status += " (output paused)" - if self._stopped: - status += " (output stopped)" - return status - def get_progress(self): - return self._output.get_progress() + def get_download_status(self): + return self._status + class LiteralDownloader: implements(IDownloadStatus) @@ -753,24 +804,22 @@ class LiteralDownloader: self._uri = IFileURI(u) assert isinstance(self._uri, uri.LiteralFileURI) self._downloadable = downloadable + self._status = s = DownloadStatus() + s.set_storage_index(None) + s.set_helper(False) + s.set_status("Done") + s.set_progress(1.0) def start(self): data = self._uri.data + self._status.set_size(len(data)) self._downloadable.open(len(data)) self._downloadable.write(data) self._downloadable.close() return defer.maybeDeferred(self._downloadable.finish) - def get_storage_index(self): - return None - def get_size(self): - return len(self._uri.data) - def using_helper(self): - return False - def get_status(self): - return "Done" - def get_progress(self): - return 1.0 + def get_download_status(self): + return self._status class FileName: implements(IDownloadTarget) @@ -858,7 +907,7 @@ class Downloader(service.MultiService): dl = FileDownloader(self.parent, u, t) else: raise RuntimeError("I don't know how to download a %s" % u) - self._all_downloads[dl] = None + self._all_downloads[dl.get_download_status()] = None d = dl.start() return d