tailscale

Commit Graph

Author	SHA1	Message	Date
Joe Tsai	975c5f7684	taildrop: lazily perform full deletion scan after first taildrop use (#10137 ) Simply reading the taildrop directory can pop up security dialogs on platforms like macOS. Avoid this by only performing garbage collection of partial and deleted files after the first received taildrop file, which would have prompted the security dialog window. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 year ago
Joe Tsai	6ada33db77	taildrop: fix theoretical race condition in fileDeleter.Init (#9876 ) It is possible that upon a cold-start, we enqueue a partial file for deletion that is resumed shortly after startup. If the file transfer happens to last longer than deleteDelay, we will delete the partial file, which is unfortunate. The client spent a long time uploading a file, only for it to be accidentally deleted. It's a very rare race, but also a frustrating one if it happens to manifest. Fix the code to only delete partial files that do not have an active puts against it. We also fix a minor bug in ResumeReader where we read b[:blockSize] instead of b[:cs.Size]. The former is the fixed size of 64KiB, while the latter is usually 64KiB, but may be less for the last block. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 year ago
Joe Tsai	d603d18956	taildrop: fix TestResume (#9874 ) Previously, the test simply relied on: defer close() to cleanup file handles. This works fine on Unix-based systems, but not on Windows, which dislikes deleting files where an open file handle continues to exist. Fix the test by explicitly closing the file handle after we are done with the resource. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 year ago
Joe Tsai	cb00eac850	taildrop: disable TestResume (#9873 ) This test is currently failing on Windows. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 year ago
Joe Tsai	a8fbe284b2	taildrop: fix theoretical race condition (#9866 ) WaitGroup.Wait should not be concurrently called WaitGroup.Add. In other words, we should not start new goroutines after shutodwn is called. Thus, add a conditional to check that shutdown has not been called before starting off a new waitAndDelete goroutine. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 year ago
Joe Tsai	3f27087e9d	taildrop: switch hashing to be streaming based (#9861 ) While the previous logic was correct, it did not perform well. Resuming is a dance between the client and server, where 1. the client requests hashes for a partial file, 2. the server then computes those hashes, 3. the client computes hashes locally and compares them. 4. goto 1 while the partial file still has data While step 2 is running, the client is sitting idle. While step 3 is running, the server is sitting idle. By streaming over the block hash immediately after the server computes it, the client can start checking the hash, while the server works on the next hash (in a pipelined manner). This performs dramatically better and also uses less memory as we don't need to hold a list of hashes, but only need to handle one hash at a time. There are two detriments to this approach: * The HTTP API relies on a JSON stream, which is not a standard REST-like pattern. However, since we implement both client and server, this is fine. * While the stream is on-going, we hold an open file handle on the server side while the file is being hashed. On really slow streams, this could hold a file open forever. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net> Co-authored-by: Rhea Ghosh <rhea@tailscale.com>	1 year ago
Joe Tsai	c2a551469c	taildrop: implement asynchronous file deletion (#9844 ) File resumption requires keeping partial files around for some time, but we must still eventually delete them if never resumed. Thus, we implement asynchronous file deletion, which could spawn a background goroutine to delete the files. We also use the same mechanism for deleting files on Windows, where a file can't be deleted if there is still an open file handle. We can enqueue those with the asynchronous file deleter as well. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 year ago
Joe Tsai	8f948638c5	taildrop: minor cleanups and fixes (#9786 ) Perform the same m==nil check in Manager.{PartialFiles,HashPartialFile} as we do in the other methods. Fix HashPartialFile is properly handle a length of -1. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 year ago
Joe Tsai	b1867eb23f	taildrop: add logic for resuming partial files (#9785 ) We add the following API: * type FileChecksums * type Checksum * func Manager.PartialFiles * func Manager.HashPartialFile * func ResumeReader The Manager methods provide the ability to query for partial files and retrieve a list of checksums for a given partial file. The ResumeReader function is a helper that wraps an io.Reader to discard content that is identical locally and remotely. The FileChecksums type represents the checksums of a file and is safe to JSON marshal and send over the wire. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net> Co-authored-by: Rhea Ghosh <rhea@tailscale.com>	1 year ago
Joe Tsai	37c646d9d3	taildrop: improve the functionality and reliability of put (#9762 ) Changes made: * Move all HTTP related functionality from taildrop to ipnlocal. * Add two arguments to taildrop.Manager.PutFile to specify an opaque client ID and a resume offset (both unused for now). * Cleanup the logic of taildrop.Manager.PutFile to be easier to follow. * Implement file conflict handling where duplicate files are renamed (e.g., "IMG_1234.jpg" -> "IMG_1234 (2).jpg"). * Implement file de-duplication where "renaming" a partial file simply deletes it if it already exists with the same contents. * Detect conflicting active puts where a second concurrent put results in an error. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net> Co-authored-by: Rhea Ghosh <rhea@tailscale.com>	1 year ago
Joe Tsai	e4cb83b18b	taildrop: document and cleanup the package (#9699 ) Changes made: * Unexport declarations specific to internal taildrop functionality. * Document all exported functionality. * Move TestRedactErr to the taildrop package. * Rename and invert Handler.DirectFileDoFinalRename as AvoidFinalRename. Updates tailscale/corp#14772 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 year ago
Rhea Ghosh	557ddced6c	{ipn/ipnlocal, taildrop}: move put logic to taildrop (#9680 ) Cleaning up taildrop logic for sending files. Updates tailscale/corp#14772 Signed-off-by: Rhea Ghosh <rhea@tailscale.com> Co-authored-by: Joe Tsai <joetsai@digital-static.net>	1 year ago
Rhea Ghosh	dc1c7cbe3e	taildrop: initial commit of taildrop functionality refactoring (#9676 ) Over time all taildrop functionality will be contained in the taildrop package. This will include end to end unit tests. This is simply the first smallest piece to move over. There is no functionality change in this commit. Updates tailscale/corp#14772 Signed-off-by: Rhea Ghosh <rhea@tailscale.com> Co-authored-by: Joseph Tsai <joetsai@tailscale.com>	1 year ago

13 Commits (a54a4f757bfb9400550372d4b91fd5dc331587d0)