dropbox API v2 upload large files using python

Question

I'm trying to upload big file (~900MB) via Dropbox API v2 but I'm getting this error:

requests.exceptions.ConnectionError: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer'))

It works ok with smaller files.

I found in documentation that I need to open upload session using files_upload_session_start method but I have an error on this command and I can't go further with ._append methods.

How can I solve this problem? There're no info in docs. I'm using Python 3.5.1 and latest dropbox module installed using pip.

Here's code which I'm running to:

c = Dropbox(access_token)
f = open("D:\\Programs\\ubuntu-13.10-desktop-amd64.iso", "rb")
result = c.files_upload_session_start(f)
f.seek(0, os.SEEK_END)
size = f.tell()
c.files_upload_session_finish(f,     files.UploadSessionCursor(result.session_id, size), files.CommitInfo("/test900.iso"))

Answer 1

For large files like this, you'll need to use upload sessions. Otherwise, you'll run in to issues like the error you posted.

This uses the Dropbox Python SDK to upload a file to the Dropbox API from the local file as specified by file_path to the remote path as specified by dest_path. It also chooses whether or not to use an upload session based on the size of the file:

f = open(file_path)
file_size = os.path.getsize(file_path)

CHUNK_SIZE = 4 * 1024 * 1024

if file_size <= CHUNK_SIZE:

    print dbx.files_upload(f, dest_path)

else:

    upload_session_start_result = dbx.files_upload_session_start(f.read(CHUNK_SIZE))
    cursor = dropbox.files.UploadSessionCursor(session_id=upload_session_start_result.session_id,
                                               offset=f.tell())
    commit = dropbox.files.CommitInfo(path=dest_path)

    while f.tell() < file_size:
        if ((file_size - f.tell()) <= CHUNK_SIZE):
            print dbx.files_upload_session_finish(f.read(CHUNK_SIZE),
                                            cursor,
                                            commit)
        else:
            dbx.files_upload_session_append(f.read(CHUNK_SIZE),
                                            cursor.session_id,
                                            cursor.offset)
            cursor.offset = f.tell()

Answer 2

@Greg answer can be updated with Dropbox Api v2 call:

self.client.files_upload_session_append_v2(
                f.read(self.CHUNK_SIZE), cursor)
cursor.offset = f.tell()