views.py 文件源码

def share_notebook(request, course, student, notebook):
    """
    the URL to create static snapshots; it is intended to be fetched through ajax

    * computes a hash for storing the output
    * runs nbconvert in the student's container
    * stores the result in /nbhosting/snapshots/<course>/<hash>.html
    * returns a JSON-encoded dict that is either
      * { url: "/snapshots/flotpython/5465789765789.html" }
      * or { error: "the error message" }
    """

    # the ipynb extension is removed from the notebook name in urls.py
    notebook_withext = notebook + ".ipynb"
    # compute hash from the input, so that a second run on the same notebook
    # will override any previsouly published static snapshot
    hasher = hashlib.sha1(bytes('{}-{}-{}'.format(course, student, notebook),
                                encoding='utf-8'))
    hash = hasher.hexdigest()

    subcommand = 'docker-share-student-course-notebook-in-hash'

    command = ['nbh', '-d', sitesettings.root]
    if DEBUG:
        command.append('-x')
    command.append(subcommand)

    command += [ student, course, notebook_withext, hash]

    logger.info("In {}\n-> Running command {}".format(Path.cwd(), " ".join(command)))
    completed_process = subprocess.run(
        command, universal_newlines=True,
        stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    log_completed_process(completed_process, subcommand)

    if completed_process.returncode != 0:
        message = "command {} returned {}\nstderr:{}"\
                  .format(" ".join(command),
                          completed_process.returncode,
                          completed_process.stderr)
        return JsonResponse(dict(error=message))

    # expect docker-share-student-course-notebook to write a url_path on its stdout
    url_path = completed_process.stdout.strip()
    logger.info("reading url_path={}".format(url_path))
    # rebuild a full URL with proto and hostname,
    url = "{scheme}://{hostname}{path}"\
          .format(scheme=request.scheme, hostname=request.get_host(), path=url_path)
    return JsonResponse(dict(url_path=url_path, url=url))