from twisted.spread.util import FilePager from twisted.spread.flavors import Referenceable from twisted.internet.defer import Deferred import os PATH = r"C:\temp\very_large_file.exe" ### Server Side class ResultsPager(FilePager): def __init__(self, collector, path): self._deferred = Deferred() print "%s, %d bytes" % (path, os.path.getsize(path)) fd = file(path, 'rb') FilePager.__init__(self, collector, fd, callback=self.done) def done(self): print "The entire file has been transferred." self._deferred.callback(self.collector) def wait(self): return self._deferred class FilePagerizer(Referenceable): def remote_getFile(self, collector, path): pager = ResultsPager(collector, path) return pager.wait() ### Client Side class SimplePageCollector(Referenceable): def __init__(self): self.pages = [] def remote_gotPage(self, page): self.pages.append(page) print "gotPage (%d bytes)" % len(page) def remote_endedPaging(self): print 'endedPaging' class FilerGetter: def __init__(self, p): self._file_pagerizer = p def getRemoteFile(self, path): root, ext = os.path.splitext(os.path.basename(path)) local_path = root + '-new' + ext return self._file_pagerizer.callRemote( "getFile", SimplePageCollector(), path).addCallback(self._finished, local_path) def _finished(self, collector, path): data = ''.join(collector.pages) with file(path, 'wb') as f: f.write(data) print "write to %s, %d bytes" % (path, len(data)) if __name__ == '__main__': import sys from twisted.internet import reactor from twisted.python import log log.startLogging(sys.stdout) PORTNO = 8123 if sys.argv[1] == 'server': from twisted.spread.flavors import Root from twisted.spread.pb import PBServerFactory class SimpleRoot(Root): def rootObject(self, broker): return FilePagerizer() reactor.listenTCP(PORTNO, PBServerFactory(SimpleRoot())) elif sys.argv[1] == 'client': from twisted.spread import pb def getFile1(x, path): r = FilerGetter(x) return r.getRemoteFile(path) from twisted.spread import util def getFile2(x, path): def finished(pages): data = ''.join(pages) root, ext = os.path.splitext(os.path.basename(path)) local_path = root + '-new' + ext f = file(local_path, 'wb') f.write(data) print "%d bytes written to %s" % (len(data), local_path) util.getAllPages(x, "getFile", path).addCallback(finished) cf = pb.PBClientFactory() reactor.connectTCP("localhost", PORTNO, cf) cf.getRootObject().addCallback(getFile2, PATH) else: raise sys.exit("usage: %s (server|client)" % sys.argv[0])