I saw examples that used pycurl, but could not be sure if this is the way to go with? Some examples will help. Thanks.
5 Answers
Here is demo application that implements tornado upload.
Here is server code:
import tornado.httpserver, tornado.ioloop, tornado.options, tornado.web, os.path, random, string
from tornado.options import define, options
define("port", default=8888, help="run on the given port", type=int)
class Application(tornado.web.Application):
def __init__(self):
handlers = [
(r"/", IndexHandler),
(r"/upload", UploadHandler)
]
tornado.web.Application.__init__(self, handlers)
class IndexHandler(tornado.web.RequestHandler):
def get(self):
self.render("upload_form.html")
class UploadHandler(tornado.web.RequestHandler):
def post(self):
file1 = self.request.files['file1'][0]
original_fname = file1['filename']
extension = os.path.splitext(original_fname)[1]
fname = ''.join(random.choice(string.ascii_lowercase + string.digits) for x in range(6))
final_filename= fname+extension
output_file = open("uploads/" + final_filename, 'w')
output_file.write(file1['body'])
self.finish("file" + final_filename + " is uploaded")
def main():
http_server = tornado.httpserver.HTTPServer(Application())
http_server.listen(options.port)
tornado.ioloop.IOLoop.instance().start()
if __name__ == "__main__":
main()
The only thing, you have to understand from this code, that file content located in self.request.files[<file_input_name>][0].
Here is html code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>Tornado Upload Application</title>
</head>
<body>
<p><h1>Tornado Upload App</h1></p>
<form enctype="multipart/form-data" action="/upload" method="post">
File: <input type="file" name="file1" />
<br />
<br />
<input type="submit" value="upload" />
</form>
When working with files - be sure, that form has enctype="multipart/form-data".
It's simple:
<form action="/file" methods="POST"><!--your code--></form>
in Python:
class FileHandler(tornado.web.RequestHandler):
# get post data
file_body = self.request.files['filefieldname'][0]['body']
img = Image.open(io.StringIO(file_body))
img.save("../img/", img.format)
but it's not recommended, because all uploaded data is loaded in RAM; the best way is use nginx loadup module, but this is complex.
Previous code returned bad filename and wrong encoding. Following code works:
import tornado.httpserver, tornado.ioloop, tornado.options, tornado.web, os.path, random, string
class Application(tornado.web.Application):
def __init__(self):
handlers = [
(r"/", IndexHandler),
(r"/upload", UploadHandler)
]
tornado.web.Application.__init__(self, handlers)
class IndexHandler(tornado.web.RequestHandler):
def get(self):
self.render("tornadoUpload.html")
class UploadHandler(tornado.web.RequestHandler):
def post(self):
file1 = self.request.files['file1'][0]
original_fname = file1['filename']
output_file = open("uploads/" + original_fname, 'wb')
output_file.write(file1['body'])
self.finish("file " + original_fname + " is uploaded")
settings = {
'template_path': 'templates',
'static_path': 'static',
"xsrf_cookies": False
}
application = tornado.web.Application([
(r"/", IndexHandler),
(r"/upload", UploadHandler)
], debug=True,**settings)
print "Server started."
if __name__ == "__main__":
application.listen(8888)
tornado.ioloop.IOLoop.instance().start()
Comments
I was running into trouble when accesses the files properties with the [''] syntax, not sure why, but I switched to dot syntax and was able to read the data. I'm on a windows machine so I also had to change 'open("static/public/" + file_name, 'w')' to 'open("static/public/" + file_name, 'wb')'. Without the 'wb' the files were getting corrupted.
def uploadFile(self,input_name,file_type):
a_file = self.request.files[input_name][0]
extension = os.path.splitext(a_file.filename)[1]
if file_type is 'photo':
type_list = ['.png','.jpg','.jpeg','.gif']
elif file_type is 'attachment':
type_list = ['.pdf','.doc','.docx','.xls']
if extension in type_list:
file_name = ''.join(random.choice(string.ascii_lowercase + string.digits) for x in range(16))
output_file = open("static/public/" + file_name + extension, 'wb')
output_file.write(a_file.body)
return (a_file.filename + " has been uploaded.")
Comments
tornado.web.RequestHandler has self.request.files method.
it's result like
{u'file': [{'body':FILEBODY, 'content_type':CONTENT_TYPE, 'filename': FILENAME}],...}
