re-assemble file / resume downloads

lbrynet/extras/daemon/Daemon.py

@@ -1581,6 +1581,9 @@ class Daemon(metaclass=JSONRPCServerType):
         if existing:
             log.info("already have matching stream for %s", uri)
             stream = existing[0]
+            if not stream.running:
+                log.info("resuming download")
+                await self.stream_manager.start_stream(stream)
         else:
             stream = await self.stream_manager.download_stream_from_claim(
                 self.dht_node, resolved, file_name, timeout, fee_amount, fee_address
@@ -1618,7 +1621,7 @@ class Daemon(metaclass=JSONRPCServerType):
             raise Exception(f'Unable to find a file for {kwargs}')
         stream = streams[0]
         if status == 'start' and not stream.running and not stream.finished:
-            stream.downloader.download(self.dht_node)
+            await self.stream_manager.start_stream(stream)
             msg = "Resumed download"
         elif status == 'stop' and stream.running:
             stream.stop_download()

lbrynet/extras/daemon/storage.py

@@ -447,6 +447,12 @@ class SQLiteStorage(SQLiteMixin):
         log.info("update file status %s -> %s", stream_hash, new_status)
         return self.db.execute("update file set status=? where stream_hash=?", (new_status, stream_hash))
 
+    def change_file_download_dir(self, stream_hash: str, download_dir: str):
+        log.info("update file status %s -> %s", stream_hash, download_dir)
+        return self.db.execute("update file set download_directory=? where stream_hash=?", (
+            binascii.hexlify(download_dir.encode()).decode(), stream_hash
+        ))
+
     def get_all_stream_hashes(self):
         return self.run_and_return_list("select stream_hash from stream")
 

lbrynet/stream/managed_stream.py

@@ -11,6 +11,7 @@ from lbrynet.extras.daemon.storage import StoredStreamClaim
 if typing.TYPE_CHECKING:
     from lbrynet.schema.claim import ClaimDict
     from lbrynet.blob.blob_manager import BlobFileManager
+    from lbrynet.dht.node import Node
 
 log = logging.getLogger(__name__)
 
@@ -155,6 +156,10 @@ class ManagedStream:
         return cls(loop, blob_manager, descriptor, os.path.dirname(file_path), os.path.basename(file_path),
                    status=cls.STATUS_FINISHED)
 
+    def start_download(self, node: typing.Optional['Node']):
+        self.downloader.download(node)
+        self.update_status(self.STATUS_RUNNING)
+
     def stop_download(self):
         if self.downloader:
             self.downloader.stop()

lbrynet/stream/stream_manager.py

@@ -63,15 +63,35 @@ class StreamManager:
         claim_info = await self.storage.get_content_claim(stream.stream_hash)
         stream.set_claim(claim_info, smart_decode(claim_info['value']))
 
+    async def start_stream(self, stream: ManagedStream):
+        path = os.path.join(stream.download_directory, stream.file_name)
+
+        if not stream.running or not os.path.isfile(path):
+            if stream.downloader:
+                stream.downloader.stop()
+                stream.downloader = None
+            if not os.path.isfile(path) and not os.path.isfile(
+                    os.path.join(self.config.download_dir, stream.file_name)):
+                await self.storage.change_file_download_dir(stream.stream_hash, self.config.download_dir)
+                stream.download_directory = self.config.download_dir
+            stream.downloader = self.make_downloader(
+                stream.sd_hash, stream.download_directory, stream.file_name
+            )
+            stream.start_download(self.node)
+            await self.storage.change_file_status(stream.stream_hash, 'running')
+            stream.update_status('running')
+            self.wait_for_stream_finished(stream)
+
+    def make_downloader(self, sd_hash: str, download_directory: str, file_name: str):
+        return StreamDownloader(
+            self.loop, self.config, self.blob_manager, sd_hash, download_directory, file_name
+        )
+
     async def add_stream(self, sd_hash: str, file_name: str, download_directory: str, status: str, claim):
         sd_blob = self.blob_manager.get_blob(sd_hash)
         if sd_blob.get_is_verified():
             descriptor = await self.blob_manager.get_stream_descriptor(sd_blob.blob_hash)
-            downloader = StreamDownloader(
-                self.loop, self.config, self.blob_manager, descriptor.sd_hash,
-                download_directory,
-                file_name
-            )
+            downloader = self.make_downloader(descriptor.sd_hash, download_directory, file_name)
             stream = ManagedStream(
                 self.loop, self.blob_manager, descriptor,
                 download_directory,
@@ -96,13 +116,10 @@ class StreamManager:
             return
         await self.node.joined.wait()
         resumed = 0
-        for stream in self.streams:
-            if stream.status == ManagedStream.STATUS_RUNNING:
-                resumed += 1
-                stream.downloader.download(self.node)
-                self.wait_for_stream_finished(stream)
+        t = [self.start_stream(stream) for stream in self.streams if stream.status == ManagedStream.STATUS_RUNNING]
         if resumed:
-            log.info("resuming %i downloads", resumed)
+            log.info("resuming %i downloads", t)
+        await asyncio.gather(*t, loop=self.loop)
 
     async def reflect_streams(self):
         streams = list(self.streams)