start returning bytes for a range request at the requested starting position

lbrynet/extras/daemon/Daemon.py

@@ -486,6 +486,7 @@ async def handle_old_jsonrpc(self, request):
 
     async def handle_stream_get_request(self, request: web.Request):
         if not self.conf.streaming_get:
+            log.warning("streaming_get is disabled, rejecting request")
             raise web.HTTPForbidden()
         name_and_claim_id = request.path.split("/get/")[1]
         if "/" not in name_and_claim_id:
@@ -501,6 +502,20 @@ async def handle_stream_get_request(self, request: web.Request):
         raise web.HTTPFound(f"/stream/{stream.sd_hash}")
 
     async def handle_stream_range_request(self, request: web.Request):
+        try:
+            return await self._handle_stream_range_request(request)
+        except web.HTTPException as err:
+            log.warning("http code during /stream range request: %s", err)
+            raise err
+        except asyncio.CancelledError:
+            log.debug("/stream range request cancelled")
+        except Exception:
+            log.exception("error handling /stream range request")
+            raise
+        finally:
+            log.debug("finished handling /stream range request")
+
+    async def _handle_stream_range_request(self, request: web.Request):
         sd_hash = request.path.split("/stream/")[1]
         if not self.stream_manager.started.is_set():
             await self.stream_manager.started.wait()

lbrynet/stream/managed_stream.py

@@ -3,7 +3,7 @@
 import typing
 import logging
 import binascii
-from aiohttp.web import Request, StreamResponse
+from aiohttp.web import Request, StreamResponse, HTTPRequestRangeNotSatisfiable
 from lbrynet.utils import generate_id
 from lbrynet.error import DownloadSDTimeout
 from lbrynet.schema.mime_types import guess_media_type
@@ -316,8 +316,10 @@ async def _aiter_read_stream(self, start_blob_num: typing.Optional[int] = 0, con
     async def stream_file(self, request: Request, node: typing.Optional['Node'] = None) -> StreamResponse:
         log.info("stream file to browser for lbry://%s#%s (sd hash %s...)", self.claim_name, self.claim_id,
                  self.sd_hash[:6])
+        headers, size, skip_blobs, first_blob_start_offset = self._prepare_range_response_headers(
+            request.headers.get('range', 'bytes=0-')
+        )
         await self.start(node)
-        headers, size, skip_blobs = self._prepare_range_response_headers(request.headers.get('range', 'bytes=0-'))
         response = StreamResponse(
             status=206,
             headers=headers
@@ -327,11 +329,16 @@ async def stream_file(self, request: Request, node: typing.Optional['Node'] = No
         self.streaming.set()
         try:
             wrote = 0
-            async for blob_info, decrypted in self._aiter_read_stream(skip_blobs, connection_id=2):
+            async for blob_info, decrypted in self._aiter_read_stream(skip_blobs, connection_id=self.STREAMING_ID):
+                if not wrote:
+                    decrypted = decrypted[first_blob_start_offset:]
                 if (blob_info.blob_num == len(self.descriptor.blobs) - 2) or (len(decrypted) + wrote >= size):
                     decrypted += (b'\x00' * (size - len(decrypted) - wrote - (skip_blobs * 2097151)))
+                    log.debug("sending browser final blob (%i/%i)", blob_info.blob_num + 1,
+                              len(self.descriptor.blobs) - 1)
                     await response.write_eof(decrypted)
                 else:
+                    log.debug("sending browser blob (%i/%i)", blob_info.blob_num + 1, len(self.descriptor.blobs) - 1)
                     await response.write(decrypted)
                 wrote += len(decrypted)
                 log.info("sent browser %sblob %i/%i", "(final) " if response._eof_sent else "",
@@ -491,7 +498,7 @@ async def _delayed_stop(self):
                 return
             await asyncio.sleep(1, loop=self.loop)
 
-    def _prepare_range_response_headers(self, get_range: str) -> typing.Tuple[typing.Dict[str, str], int, int]:
+    def _prepare_range_response_headers(self, get_range: str) -> typing.Tuple[typing.Dict[str, str], int, int, int]:
         if '=' in get_range:
             get_range = get_range.split('=')[1]
         start, end = get_range.split('-')
@@ -509,16 +516,23 @@ def _prepare_range_response_headers(self, get_range: str) -> typing.Tuple[typing
             log.debug("estimating stream size")
 
         start = int(start)
+        if not 0 <= start < size:
+            raise HTTPRequestRangeNotSatisfiable()
+
         end = int(end) if end else size - 1
+
+        if end >= size:
+            raise HTTPRequestRangeNotSatisfiable()
+
         skip_blobs = start // 2097150
         skip = skip_blobs * 2097151
-        start = skip
+        skip_first_blob = start - skip
+        start = skip_first_blob + skip
         final_size = end - start + 1
-
         headers = {
             'Accept-Ranges': 'bytes',
             'Content-Range': f'bytes {start}-{end}/{size}',
             'Content-Length': str(final_size),
             'Content-Type': self.mime_type
         }
-        return headers, size, skip_blobs
+        return headers, size, skip_blobs, skip_first_blob