diff options
Diffstat (limited to 'docker/client.py')
| -rw-r--r-- | docker/client.py | 290 |
1 files changed, 286 insertions, 4 deletions
diff --git a/docker/client.py b/docker/client.py index 65777b7..2eb859c 100644 --- a/docker/client.py +++ b/docker/client.py @@ -12,19 +12,301 @@ # See the License for the specific language governing permissions and # limitations under the License. -from . import clientbase -from . import errors +import json +import struct +import sys + +import requests +import requests.exceptions +import six +import websocket + + from . import api +from . import constants +from . import errors +from .auth import auth +from .unixconn import unixconn +from .ssladapter import ssladapter +from .utils import utils, check_resource +from .tls import TLSConfig class Client( - clientbase.ClientBase, + requests.Session, api.BuildApiMixin, api.ContainerApiMixin, api.DaemonApiMixin, api.ExecApiMixin, api.ImageApiMixin): - pass + def __init__(self, base_url=None, version=None, + timeout=constants.DEFAULT_TIMEOUT_SECONDS, tls=False): + super(Client, self).__init__() + + if tls and not base_url.startswith('https://'): + raise errors.TLSParameterError( + 'If using TLS, the base_url argument must begin with ' + '"https://".') + + self.base_url = base_url + self.timeout = timeout + + self._auth_configs = auth.load_config() + + base_url = utils.parse_host(base_url, sys.platform) + if base_url.startswith('http+unix://'): + self._custom_adapter = unixconn.UnixAdapter(base_url, timeout) + self.mount('http+docker://', self._custom_adapter) + self.base_url = 'http+docker://localunixsocket' + else: + # Use SSLAdapter for the ability to specify SSL version + if isinstance(tls, TLSConfig): + tls.configure_client(self) + elif tls: + self._custom_adapter = ssladapter.SSLAdapter() + self.mount('https://', self._custom_adapter) + self.base_url = base_url + + # version detection needs to be after unix adapter mounting + if version is None: + self._version = constants.DEFAULT_DOCKER_API_VERSION + elif isinstance(version, six.string_types): + if version.lower() == 'auto': + self._version = self._retrieve_server_version() + else: + self._version = version + else: + raise errors.DockerException( + 'Version parameter must be a string or None. Found {0}'.format( + type(version).__name__ + ) + ) + + def _retrieve_server_version(self): + try: + return self.version(api_version=False)["ApiVersion"] + except KeyError: + raise errors.DockerException( + 'Invalid response from docker daemon: key "ApiVersion"' + ' is missing.' + ) + except Exception as e: + raise errors.DockerException( + 'Error while fetching server API version: {0}'.format(e) + ) + + def _set_request_timeout(self, kwargs): + """Prepare the kwargs for an HTTP request by inserting the timeout + parameter, if not already present.""" + kwargs.setdefault('timeout', self.timeout) + return kwargs + + def _post(self, url, **kwargs): + return self.post(url, **self._set_request_timeout(kwargs)) + + def _get(self, url, **kwargs): + return self.get(url, **self._set_request_timeout(kwargs)) + + def _delete(self, url, **kwargs): + return self.delete(url, **self._set_request_timeout(kwargs)) + + def _url(self, pathfmt, resource_id=None, versioned_api=True): + if resource_id and not isinstance(resource_id, six.string_types): + raise ValueError( + 'Expected a resource ID string but found {0} ({1}) ' + 'instead'.format(resource_id, type(resource_id)) + ) + elif resource_id: + resource_id = six.moves.urllib.parse.quote_plus(resource_id) + + if versioned_api: + return '{0}/v{1}{2}'.format( + self.base_url, self._version, pathfmt.format(resource_id) + ) + else: + return '{0}{1}'.format(self.base_url, pathfmt.format(resource_id)) + + def _raise_for_status(self, response, explanation=None): + """Raises stored :class:`APIError`, if one occurred.""" + try: + response.raise_for_status() + except requests.exceptions.HTTPError as e: + if e.response.status_code == 404: + raise errors.NotFound(e, response, explanation=explanation) + raise errors.APIError(e, response, explanation=explanation) + + def _result(self, response, json=False, binary=False): + assert not (json and binary) + self._raise_for_status(response) + + if json: + return response.json() + if binary: + return response.content + return response.text + + def _post_json(self, url, data, **kwargs): + # Go <1.1 can't unserialize null to a string + # so we do this disgusting thing here. + data2 = {} + if data is not None: + for k, v in six.iteritems(data): + if v is not None: + data2[k] = v + + if 'headers' not in kwargs: + kwargs['headers'] = {} + kwargs['headers']['Content-Type'] = 'application/json' + return self._post(url, data=json.dumps(data2), **kwargs) + + def _attach_params(self, override=None): + return override or { + 'stdout': 1, + 'stderr': 1, + 'stream': 1 + } + + @check_resource + def _attach_websocket(self, container, params=None): + url = self._url("/containers/{0}/attach/ws", container) + req = requests.Request("POST", url, params=self._attach_params(params)) + full_url = req.prepare().url + full_url = full_url.replace("http://", "ws://", 1) + full_url = full_url.replace("https://", "wss://", 1) + return self._create_websocket_connection(full_url) + + def _create_websocket_connection(self, url): + return websocket.create_connection(url) + + def _get_raw_response_socket(self, response): + self._raise_for_status(response) + if six.PY3: + sock = response.raw._fp.fp.raw + else: + sock = response.raw._fp.fp._sock + try: + # Keep a reference to the response to stop it being garbage + # collected. If the response is garbage collected, it will + # close TLS sockets. + sock._response = response + except AttributeError: + # UNIX sockets can't have attributes set on them, but that's + # fine because we won't be doing TLS over them + pass + + return sock + + def _stream_helper(self, response, decode=False): + """Generator for data coming from a chunked-encoded HTTP response.""" + if response.raw._fp.chunked: + reader = response.raw + while not reader.closed: + # this read call will block until we get a chunk + data = reader.read(1) + if not data: + break + if reader._fp.chunk_left: + data += reader.read(reader._fp.chunk_left) + if decode: + if six.PY3: + data = data.decode('utf-8') + data = json.loads(data) + yield data + else: + # Response isn't chunked, meaning we probably + # encountered an error immediately + yield self._result(response) + + def _multiplexed_buffer_helper(self, response): + """A generator of multiplexed data blocks read from a buffered + response.""" + buf = self._result(response, binary=True) + walker = 0 + while True: + if len(buf[walker:]) < 8: + break + _, length = struct.unpack_from('>BxxxL', buf[walker:]) + start = walker + constants.STREAM_HEADER_SIZE_BYTES + end = start + length + walker = end + yield buf[start:end] + + def _multiplexed_response_stream_helper(self, response): + """A generator of multiplexed data blocks coming from a response + stream.""" + + # Disable timeout on the underlying socket to prevent + # Read timed out(s) for long running processes + socket = self._get_raw_response_socket(response) + if six.PY3: + socket._sock.settimeout(None) + else: + socket.settimeout(None) + + while True: + header = response.raw.read(constants.STREAM_HEADER_SIZE_BYTES) + if not header: + break + _, length = struct.unpack('>BxxxL', header) + if not length: + continue + data = response.raw.read(length) + if not data: + break + yield data + + def _stream_raw_result_old(self, response): + ''' Stream raw output for API versions below 1.6 ''' + self._raise_for_status(response) + for line in response.iter_lines(chunk_size=1, + decode_unicode=True): + # filter out keep-alive new lines + if line: + yield line + + def _stream_raw_result(self, response): + ''' Stream result for TTY-enabled container above API 1.6 ''' + self._raise_for_status(response) + for out in response.iter_content(chunk_size=1, decode_unicode=True): + yield out + + def _get_result(self, container, stream, res): + cont = self.inspect_container(container) + return self._get_result_tty(stream, res, cont['Config']['Tty']) + + def _get_result_tty(self, stream, res, is_tty): + # Stream multi-plexing was only introduced in API v1.6. Anything + # before that needs old-style streaming. + if utils.compare_version('1.6', self._version) < 0: + return self._stream_raw_result_old(res) + + # We should also use raw streaming (without keep-alives) + # if we're dealing with a tty-enabled container. + if is_tty: + return self._stream_raw_result(res) if stream else \ + self._result(res, binary=True) + + self._raise_for_status(res) + sep = six.binary_type() + if stream: + return self._multiplexed_response_stream_helper(res) + else: + return sep.join( + [x for x in self._multiplexed_buffer_helper(res)] + ) + + def get_adapter(self, url): + try: + return super(Client, self).get_adapter(url) + except requests.exceptions.InvalidSchema as e: + if self._custom_adapter: + return self._custom_adapter + else: + raise e + + @property + def api_version(self): + return self._version class AutoVersionClient(Client): |