/msd/write_remote handle

configs/nginx/kvmd.ctx-server.conf

@@ -59,6 +59,18 @@ location /api/ws {
 	auth_request off;
 }
 
+location /api/msd/write_remote {
+	rewrite ^/api/msd/write_remote$ /msd/write_remote break;
+	rewrite ^/api/msd/write_remote\?(.*)$ /msd/write_remote?$1 break;
+	proxy_pass http://kvmd;
+	include /etc/kvmd/nginx/loc-proxy.conf;
+	proxy_read_timeout 7d;
+	postpone_output 0;
+	proxy_buffering off;
+	proxy_ignore_headers X-Accel-Buffering;
+	auth_request off;
+}
+
 location /api/msd/write {
 	rewrite ^/api/msd/write$ /msd/write break;
 	rewrite ^/api/msd/write\?(.*)$ /msd/write?$1 break;

kvmd/apps/kvmd/api/msd.py

@@ -20,19 +20,34 @@
 # ========================================================================== #
 
 
+import time
+
+from typing import Dict
+from typing import Optional
+
+import aiohttp
+
 from aiohttp.web import Request
 from aiohttp.web import Response
+from aiohttp.web import StreamResponse
 
 from ....logging import get_logger
 
+from .... import htclient
+
 from ....plugins.msd import BaseMsd
 
 from ....validators.basic import valid_bool
 from ....validators.basic import valid_int_f0
+from ....validators.basic import valid_float_f01
+from ....validators.net import valid_url
 from ....validators.kvm import valid_msd_image_name
 
 from ..http import exposed_http
 from ..http import make_json_response
+from ..http import make_json_exception
+from ..http import start_streaming
+from ..http import stream_json
 from ..http import get_multipart_reader
 from ..http import get_multipart_reader_str
 from ..http import get_multipart_reader_field
@@ -67,29 +82,79 @@ class MsdApi:
         await self.__msd.set_connected(valid_bool(request.query.get("connected")))
         return make_json_response()
 
+    # =====
+
     @exposed_http("POST", "/msd/write")
     async def __write_handler(self, request: Request) -> Response:
-        logger = get_logger(0)
         reader = await get_multipart_reader(request)
-        name = ""
-        written = 0
-        try:
         name = valid_msd_image_name(await get_multipart_reader_str(reader, "image"))
         size = valid_int_f0(await get_multipart_reader_str(reader, "size"))
-
         data_field = await get_multipart_reader_field(reader, "data")
 
-            async with self.__msd.write_image(name, size):
+        written = 0
-                logger.info("Writing image %r to MSD ...", name)
+        async with self.__msd.write_image(name, size) as chunk_size:
             while True:
-                    chunk = await data_field.read_chunk(self.__msd.get_upload_chunk_size())
+                chunk = await data_field.read_chunk(chunk_size)
                 if not chunk:
                     break
                 written = await self.__msd.write_image_chunk(chunk)
-        finally:
+
-            if written != 0:
+        return make_json_response(self.__make_write_info(name, size, written))
-                logger.info("Written image %r with size=%d bytes to MSD", name, written)
+
-        return make_json_response({"image": {"name": name, "size": written}})
+    @exposed_http("POST", "/msd/write_remote")
+    async def __write_remote_handler(self, request: Request) -> StreamResponse:  # pylint: disable=too-many-locals
+        url = valid_url(request.query.get("url"))
+        insecure = valid_bool(request.query.get("insecure", "0"))
+        timeout = valid_float_f01(request.query.get("timeout", 10.0))
+
+        name = ""
+        size = written = 0
+        response: Optional[StreamResponse] = None
+
+        async def stream_write_info() -> None:
+            assert response is not None
+            await stream_json(response, self.__make_write_info(name, size, written))
+
+        try:
+            async with htclient.download(
+                url=url,
+                verify=(not insecure),
+                timeout=timeout,
+                read_timeout=(7 * 24 * 3600),
+            ) as remote:
+
+                name = str(request.query.get("image", "")).strip()
+                if len(name) == 0:
+                    name = htclient.get_filename(remote)
+                name = valid_msd_image_name(name)
+
+                size = htclient.get_content_length(remote)
+
+                get_logger(0).info("Downloading image %r as %r to MSD ...", url, name)
+                async with self.__msd.write_image(name, size) as chunk_size:
+                    response = await start_streaming(request, "application/stream+json")
+                    last_report_ts = 0
+                    async for chunk in remote.content.iter_chunked(chunk_size):
+                        written = await self.__msd.write_image_chunk(chunk)
+                        now = int(time.time())
+                        if last_report_ts + 1 < now:
+                            await stream_write_info()
+                            last_report_ts = now
+
+                await stream_write_info()
+                return response
+
+        except Exception as err:
+            if response is not None:
+                await stream_write_info()
+            elif isinstance(err, aiohttp.ClientError):
+                return make_json_exception(err, 400)
+            raise
+
+    def __make_write_info(self, name: str, size: int, written: int) -> Dict:
+        return {"image": {"name": name, "size": size, "written": written}}
+
+    # =====
 
     @exposed_http("POST", "/msd/remove")
     async def __remove_handler(self, request: Request) -> Response:

kvmd/apps/kvmd/http.py

@@ -176,6 +176,10 @@ async def start_streaming(request: aiohttp.web.Request, content_type: str) -> ai
     return response
 
 
+async def stream_json(response: aiohttp.web.StreamResponse, result: Dict) -> None:
+    await response.write(json.dumps(result).encode("utf-8") + b"\r\n")
+
+
 # =====
 async def get_multipart_reader(request: aiohttp.web.Request) -> aiohttp.MultipartReader:
     try:

kvmd/htclient.py

@@ -20,7 +20,15 @@
 # ========================================================================== #
 
 
+import os
+import contextlib
+
+from typing import Dict
+from typing import AsyncGenerator
+from typing import Optional
+
 import aiohttp
+import aiohttp.multipart
 
 from . import __version__
 
@@ -41,3 +49,48 @@ def raise_not_200(response: aiohttp.ClientResponse) -> None:
             message=response.reason,
             headers=response.headers,
         )
+
+
+def get_content_length(response: aiohttp.ClientResponse) -> int:
+    try:
+        value = int(response.headers["Content-Length"])
+    except Exception:
+        raise aiohttp.ClientError("Empty or invalid Content-Length")
+    if value < 0:
+        raise aiohttp.ClientError("Negative Content-Length")
+    return value
+
+
+def get_filename(response: aiohttp.ClientResponse) -> str:
+    try:
+        disp = response.headers["Content-Disposition"]
+        parsed = aiohttp.multipart.parse_content_disposition(disp)
+        return str(parsed[1]["filename"])
+    except Exception:
+        try:
+            return os.path.basename(response.url.path)
+        except Exception:
+            raise aiohttp.ClientError("Can't determine filename")
+
+
+@contextlib.asynccontextmanager
+async def download(
+    url: str,
+    verify: bool=True,
+    timeout: float=10.0,
+    read_timeout: Optional[float]=None,
+    app: str="KVMD",
+) -> AsyncGenerator[aiohttp.ClientResponse, None]:
+
+    kwargs: Dict = {
+        "headers": {"User-Agent": make_user_agent(app)},
+        "timeout": aiohttp.ClientTimeout(
+            connect=timeout,
+            sock_connect=timeout,
+            sock_read=(read_timeout if read_timeout is not None else timeout),
+        ),
+    }
+    async with aiohttp.ClientSession(**kwargs) as session:
+        async with session.get(url, verify_ssl=verify) as response:
+            raise_not_200(response)
+            yield response

kvmd/plugins/msd/__init__.py

@@ -31,6 +31,8 @@ from typing import Optional
 import aiofiles
 import aiofiles.base
 
+from ...logging import get_logger
+
 from ... import aiofs
 
 from ...errors import OperationError
@@ -119,13 +121,10 @@ class BaseMsd(BasePlugin):
         raise NotImplementedError()
 
     @contextlib.asynccontextmanager
-    async def write_image(self, name: str, size: int) -> AsyncGenerator[None, None]:  # pylint: disable=unused-argument
+    async def write_image(self, name: str, size: int) -> AsyncGenerator[int, None]:  # pylint: disable=unused-argument
         if self is not None:  # XXX: Vulture and pylint hack
             raise NotImplementedError()
-        yield
+        yield 1
-
-    def get_upload_chunk_size(self) -> int:
-        raise NotImplementedError()
 
     async def write_image_chunk(self, chunk: bytes) -> int:
         raise NotImplementedError()
@@ -158,6 +157,7 @@ class MsdImageWriter:
 
     async def open(self) -> "MsdImageWriter":
         assert self.__file is None
+        get_logger(1).info("Writing %r image (%d bytes) to MSD ...", self.__name, self.__size)
         self.__file = await aiofiles.open(self.__path, mode="w+b", buffering=0)  # type: ignore
         return self
 
@@ -176,6 +176,13 @@ class MsdImageWriter:
 
     async def close(self) -> None:
         assert self.__file is not None
+        if self.__written == self.__size:
+            (log, result) = (get_logger().info, "OK")
+        elif self.__written < self.__size:
+            (log, result) = (get_logger().error, "INCOMPLETE")
+        else:  # written > size
+            (log, result) = (get_logger().warning, "OVERFLOW")
+        log("Written %d of %d bytes to MSD image %r: %s", self.__written, self.__size, self.__name, result)
         await aiofs.afile_sync(self.__file)
         await self.__file.close()  # type: ignore
 

kvmd/plugins/msd/disabled.py

@@ -70,13 +70,10 @@ class Plugin(BaseMsd):
         raise MsdDisabledError()
 
     @contextlib.asynccontextmanager
-    async def write_image(self, name: str, size: int) -> AsyncGenerator[None, None]:
+    async def write_image(self, name: str, size: int) -> AsyncGenerator[int, None]:
         if self is not None:  # XXX: Vulture and pylint hack
             raise MsdDisabledError()
-        yield
+        yield 1
-
-    def get_upload_chunk_size(self) -> int:
-        raise MsdDisabledError()
 
     async def write_image_chunk(self, chunk: bytes) -> int:
         raise MsdDisabledError()

kvmd/plugins/msd/otg/__init__.py

@@ -306,7 +306,7 @@ class Plugin(BaseMsd):  # pylint: disable=too-many-instance-attributes
             self.__state.vd.connected = connected
 
     @contextlib.asynccontextmanager
-    async def write_image(self, name: str, size: int) -> AsyncGenerator[None, None]:
+    async def write_image(self, name: str, size: int) -> AsyncGenerator[int, None]:
         try:
             async with self.__state._region:  # pylint: disable=protected-access
                 try:
@@ -328,7 +328,7 @@ class Plugin(BaseMsd):  # pylint: disable=too-many-instance-attributes
                         self.__new_writer = await MsdImageWriter(path, size, self.__sync_chunk_size).open()
 
                     await self.__notifier.notify()
-                    yield
+                    yield self.__upload_chunk_size
                     self.__set_image_complete(name, True)
 
                 finally:
@@ -343,9 +343,6 @@ class Plugin(BaseMsd):  # pylint: disable=too-many-instance-attributes
             await self.__reload_state()
             await self.__notifier.notify()
 
-    def get_upload_chunk_size(self) -> int:
-        return self.__upload_chunk_size
-
     async def write_image_chunk(self, chunk: bytes) -> int:
         assert self.__new_writer
         written = await self.__new_writer.write(chunk)

kvmd/plugins/msd/relay/__init__.py

@@ -208,7 +208,7 @@ class Plugin(BaseMsd):  # pylint: disable=too-many-instance-attributes
                 self.__connected = connected
 
     @contextlib.asynccontextmanager
-    async def write_image(self, name: str, size: int) -> AsyncGenerator[None, None]:
+    async def write_image(self, name: str, size: int) -> AsyncGenerator[int, None]:
         async with self.__working():
             async with self.__region:
                 try:
@@ -220,15 +220,12 @@ class Plugin(BaseMsd):  # pylint: disable=too-many-instance-attributes
 
                     await self.__write_image_info(False)
                     await self.__notifier.notify()
-                    yield
+                    yield self.__upload_chunk_size
                     await self.__write_image_info(True)
                 finally:
                     await self.__close_device_writer()
                     await self.__load_device_info()
 
-    def get_upload_chunk_size(self) -> int:
-        return self.__upload_chunk_size
-
     async def write_image_chunk(self, chunk: bytes) -> int:
         assert self.__device_writer
         return (await self.__device_writer.write(chunk))

kvmd/validators/net.py

@@ -116,3 +116,8 @@ def valid_ssl_ciphers(arg: Any) -> str:
     except Exception as err:
         raise ValidatorError(f"The argument {arg!r} is not a valid {name}: {err}")
     return arg
+
+
+def valid_url(arg: Any) -> str:
+    # XXX: VERY primitive
+    return check_re_match(arg, "HTTP(S) URL", r"^https?://[\[\w]+\S*")