Add support for str, bytes, or PurePath pathnames in remote_copy

This commit adds support for passing in pathnames of type str, bytes, or
PurePath to the new remote_copy() function, in addition to passing in
already-open SFTPClientFile objects.

asyncssh/sftp.py

@@ -137,6 +137,8 @@
 _SFTPPatList = List[Union[bytes, List[bytes]]]
 _SFTPStatFunc = Callable[[_SFTPPath], Awaitable['SFTPAttrs']]
 
+_SFTPClientFileOrPath = Union['SFTPClientFile', _SFTPPath]
+
 _SFTPNames = Tuple[Sequence['SFTPName'], bool]
 _SFTPOSAttrs = Union[os.stat_result, 'SFTPAttrs']
 _SFTPOSVFSAttrs = Union[os.statvfs_result, 'SFTPVFSAttrs']
@@ -799,6 +801,22 @@ async def run_task(self, offset: int, size: int) -> Tuple[int, int]:
     async def run(self) -> None:
         """Perform parallel file copy"""
 
+        if self._srcfs == self._dstfs and \
+                isinstance(self._srcfs, SFTPClient):
+            try:
+                await self._srcfs.remote_copy(self._srcpath, self._dstpath)
+            except SFTPOpUnsupported:
+                pass
+            else:
+                self._bytes_copied = self._total_bytes
+
+                if self._progress_handler:
+                    self._progress_handler(self._srcpath, self._dstpath,
+                                           self._bytes_copied,
+                                           self._total_bytes)
+
+                return
+
         try:
             self._src = await self._srcfs.open(self._srcpath, 'rb',
                                                block_size=0)
@@ -808,24 +826,6 @@ async def run(self) -> None:
             if self._progress_handler and self._total_bytes == 0:
                 self._progress_handler(self._srcpath, self._dstpath, 0, 0)
 
-            if self._srcfs == self._dstfs and \
-                    isinstance(self._srcfs, SFTPClient):
-                try:
-                    await self._srcfs.remote_copy(
-                        cast(SFTPClientFile, self._src),
-                        cast(SFTPClientFile, self._dst))
-                except SFTPOpUnsupported:
-                    pass
-                else:
-                    self._bytes_copied = self._total_bytes
-
-                    if self._progress_handler:
-                        self._progress_handler(self._srcpath, self._dstpath,
-                                               self._bytes_copied,
-                                               self._total_bytes)
-
-                    return
-
             async for _, datalen in self.iter():
                 if datalen:
                     self._bytes_copied += datalen
@@ -4283,9 +4283,9 @@ async def mcopy(self, srcpaths: _SFTPPaths,
                                block_size, max_requests, progress_handler,
                                error_handler)
 
-    async def remote_copy(self, src: SFTPClientFile, dst: SFTPClientFile,
-                          src_offset: int = 0, src_length: int = 0,
-                          dst_offset: int = 0) -> None:
+    async def remote_copy(self, src: _SFTPClientFileOrPath,
+                          dst: _SFTPClientFileOrPath, src_offset: int = 0,
+                          src_length: int = 0, dst_offset: int = 0) -> None:
         """Copy data between remote files
 
            :param src:
@@ -4298,8 +4298,12 @@ async def remote_copy(self, src: SFTPClientFile, dst: SFTPClientFile,
                The number of bytes to attempt to copy
            :param dst_offset: (optional)
                The offset to begin writing data to
-           :type src: :class:`SSHClientFile`
-           :type dst: :class:`SSHClientFile`
+           :type src:
+               :class:`SSHClientFile`, :class:`PurePath <pathlib.PurePath>`,
+               `str`, or `bytes`
+           :type dst:
+               :class:`SSHClientFile`, :class:`PurePath <pathlib.PurePath>`,
+               `str`, or `bytes`
            :type src_offset: `int`
            :type src_length: `int`
            :type dst_offset: `int`
@@ -4309,6 +4313,12 @@ async def remote_copy(self, src: SFTPClientFile, dst: SFTPClientFile,
 
         """
 
+        if isinstance(src, (bytes, str, PurePath)):
+            src = await self.open(src, 'rb', block_size=0)
+
+        if isinstance(dst, (bytes, str, PurePath)):
+            dst = await self.open(dst, 'wb', block_size=0)
+
         await self._handler.copy_data(src.handle, src_offset, src_length,
                                       dst.handle, dst_offset)